+thread apply all bt

Thread 34 (LWP 12881):
+bt
#0  0x00007f9897ec9614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x318e800) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4681
#2  os_aio_linux_handle (global_seg=2, message1=0x7f98954dbe78, message2=0x7f98954dbe70, type=0x7f98954dbe68, space_id=0x7f98954dbe60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4826
#3  0x00000000008a775a in fil_aio_wait (segment=2) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/fil/fil0fil.c:5559
#4  0x000000000081a5d0 in io_handler_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0start.c:485
#5  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 33 (LWP 12877):
+bt
#0  0x00007f989734da63 in poll () from /lib64/libc.so.6
#1  0x0000000000516d04 in handle_connections_sockets () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/mysqld.cc:5383
#2  0x000000000051ce78 in mysqld_main (argc=54, argv=0x2cf6218) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/mysqld.cc:4822
#3  0x00007f989728dcdd in __libc_start_main () from /lib64/libc.so.6
#4  0x0000000000512049 in _start ()

Thread 32 (LWP 15773):
+bt
#0  0x00007f989734fd03 in select () from /lib64/libc.so.6
#1  0x00000000008ebd0f in os_thread_sleep (tm=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0thread.c:259
#2  0x00000000008d414d in log_check_margins () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/log/log0log.c:3175
#3  0x00000000009081c5 in log_free_check () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/include/log0log.ic:443
#4  row_ins_index_entry_low (mode=2, index=0x7f97f00cdbe8, entry=0x7f97f0222048, n_ext=0, thr=0x7f97f0172100) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2005
#5  0x000000000090a50f in row_ins_index_entry (thr=0x7f97f0172100, entry=<optimized out>, index=0x7f97f00cdbe8, n_ext=<optimized out>, foreign=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2288
#6  row_ins_index_entry_step (thr=0x7f97f0172100, node=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2373
#7  row_ins (thr=0x7f97f0172100, node=0x7f97f00cdbe8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2505
#8  row_ins_step (thr=0x7f97f0172100) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2622
#9  0x00000000007fab86 in row_insert_for_mysql (mysql_rec=<optimized out>, prebuilt=0x7f97f01708c8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c:1255
#10 0x00000000007e3381 in ha_innobase::write_row (this=0x7f97f00946d0, record=0x7f97f00de690 "") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/handler/ha_innodb.cc:6075
#11 0x000000000068d52d in handler::ha_write_row (this=0x7f97f00946d0, buf=0x7f97f00de690 "") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/handler.cc:5424
#12 0x0000000000574f20 in write_record (thd=0x36b6ff0, table=<optimized out>, info=0x7f97f00ff990) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_insert.cc:1788
#13 0x00000000005757db in select_insert::send_data (this=0x7f97f00ff958, values=...) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_insert.cc:3458
#14 0x00000000005ae864 in end_send (join=0x7f97f017afc0, join_tab=<optimized out>, end_of_records=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_select.cc:12768
#15 0x00000000005a8b5e in evaluate_join_record (join=0x7f97f017afc0, join_tab=0x7f97f0194be8, error=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_select.cc:11942
#16 0x00000000005b1e66 in sub_select (join=0x7f97f017afc0, join_tab=0x7f97f0194be8, end_of_records=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_select.cc:11795
#17 0x00000000005b2817 in do_select (join=0x7f97f017afc0, fields=0x36b93b0, table=0x0, procedure=0x0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_select.cc:11560
#18 0x00000000005c7c90 in JOIN::exec (this=0x7f97f017afc0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_select.cc:2403
#19 0x00000000005c93cc in mysql_select (thd=0x36b6ff0, rref_pointer_array=<optimized out>, tables=<optimized out>, wild_num=1, fields=..., conds=<optimized out>, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=3489925888, result=0x7f97f00ff958, unit=0x36b8c80, select_lex=0x36b92a0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_select.cc:2612
#20 0x00000000005c9e7d in handle_select (thd=0x36b6ff0, lex=0x36b8bc0, result=0x7f97f00ff958, setup_tables_done_option=1073741824) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_select.cc:313
#21 0x000000000058d999 in mysql_execute_command (thd=0x36b6ff0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:3166
#22 0x000000000058e643 in mysql_parse (thd=0x36b6ff0, rawbuf=<optimized out>, length=57379776, parser_state=0x7f987f06fbb0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:5844
#23 0x000000000058fcbd in dispatch_command (command=COM_QUERY, thd=0x36b6ff0, packet=0x7f97f00febf0 "INSERT INTO query115310 . t2 SELECT * FROM test . `table100_innodb_dynamic`", packet_length=2131164312) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:1061
#24 0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#25 0x000000000062a691 in handle_one_connection (arg=0x36b6ff0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#26 0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#27 0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 31 (LWP 16043):
+bt
#0  0x00007f98980d543c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000008eb001 in os_cond_wait (mutex=0x0, cond=0x3520e70) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x3520e30, reset_sig_count=1970) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0sync.c:609
#3  0x000000000081ebbf in sync_array_wait_event (arr=0x2d21650, index=2) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/sync/sync0arr.c:458
#4  0x000000000081f657 in rw_lock_x_lock_func (lock=0x1090b40 <dict_operation_lock>, pass=0, file_name=0xa5cdf0 "/ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c", line=3283) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/sync/sync0rw.c:700
#5  0x00000000007fd03c in pfs_rw_lock_x_lock_func (line=3283, file_name=0xa5cdf0 "/ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c", lock=<optimized out>, pass=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/include/sync0rw.ic:689
#6  row_mysql_lock_data_dictionary_func (trx=0x7f980c0163d8, line=3283, file=0xa5cdf0 "/ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c:1851
#7  0x00000000007fd165 in row_drop_table_for_mysql (name=0x7f9883da8c60 "query115308/#sql2-324d-d7", trx=0x7f980c0163d8, drop_db=0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c:3283
#8  0x00000000007e43e9 in ha_innobase::delete_table (this=<optimized out>, name=0x7f9883daa140 "./query115308/#sql2-324d-d7") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/handler/ha_innodb.cc:8451
#9  0x000000000068dd1e in ha_delete_table (thd=0x3664230, table_type=<optimized out>, path=<optimized out>, db=0x7f980c02f2b8 "query115308", alias=0x7f9883dabfe0 "#sql2-324d-d7", generate_warning=false) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/handler.cc:2211
#10 0x00000000005ec8a5 in quick_rm_table (base=0x2d369d0, db=0x7f980c02f2b8 "query115308", table_name=0x7f9883dabfe0 "#sql2-324d-d7", flags=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:2416
#11 0x00000000005eee2c in mysql_alter_table (thd=<optimized out>, new_db=<optimized out>, new_name=0x7f980c02f2d0 "t1", create_info=0x7f9883dac610, table_list=0x3664230, alter_info=0x2d369d0, order_num=0, order=0x0, ignore=false) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:7004
#12 0x000000000078ed1f in Alter_table_statement::execute (this=<optimized out>, thd=0x3664230) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_alter.cc:106
#13 0x000000000058ae8c in mysql_execute_command (thd=0x3664230) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:4615
#14 0x000000000058e643 in mysql_parse (thd=0x3664230, rawbuf=<optimized out>, length=57040384, parser_state=0x7f9883dadbb0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:5844
#15 0x000000000058fcbd in dispatch_command (command=COM_QUERY, thd=0x3664230, packet=0x7f980c02f1e0 "ALTER TABLE query115308 . `t1` DROP COLUMN `c5`", packet_length=2212158616) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:1061
#16 0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#17 0x000000000062a691 in handle_one_connection (arg=0x3664230) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#18 0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#19 0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 30 (LWP 15639):
+bt
#0  0x00007f98980d543c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000008eb001 in os_cond_wait (mutex=0x0, cond=0x3520f00) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x3520ec0, reset_sig_count=224) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0sync.c:609
#3  0x000000000081ebbf in sync_array_wait_event (arr=0x2d21650, index=1) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/sync/sync0arr.c:458
#4  0x000000000081f5bd in rw_lock_x_lock_wait (line=3283, file_name=0xa5cdf0 "/ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c", lock=0x1090b40 <dict_operation_lock>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/sync/sync0rw.c:532
#5  rw_lock_x_lock_low (line=3283, file_name=0xa5cdf0 "/ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c", pass=140292355234512, lock=0x1090b40 <dict_operation_lock>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/sync/sync0rw.c:575
#6  rw_lock_x_lock_func (lock=0x1090b40 <dict_operation_lock>, pass=140292355234512, file_name=0xa5cdf0 "/ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c", line=3283) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/sync/sync0rw.c:634
#7  0x00000000007fd03c in pfs_rw_lock_x_lock_func (line=3283, file_name=0xa5cdf0 "/ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c", lock=<optimized out>, pass=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/include/sync0rw.ic:689
#8  row_mysql_lock_data_dictionary_func (trx=0x7f9854037d98, line=3283, file=0xa5cdf0 "/ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c:1851
#9  0x00000000007fd165 in row_drop_table_for_mysql (name=0x7f985bff9c60 "query115301/#sql2-324d-84", trx=0x7f9854037d98, drop_db=0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c:3283
#10 0x00000000007e43e9 in ha_innobase::delete_table (this=<optimized out>, name=0x7f985bffb140 "./query115301/#sql2-324d-84") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/handler/ha_innodb.cc:8451
#11 0x000000000068dd1e in ha_delete_table (thd=0x3682370, table_type=<optimized out>, path=<optimized out>, db=0x7f98540049c0 "query115301", alias=0x7f985bffcfe0 "#sql2-324d-84", generate_warning=false) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/handler.cc:2211
#12 0x00000000005ec8a5 in quick_rm_table (base=0x2d369d0, db=0x7f98540049c0 "query115301", table_name=0x7f985bffcfe0 "#sql2-324d-84", flags=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:2416
#13 0x00000000005eee2c in mysql_alter_table (thd=<optimized out>, new_db=<optimized out>, new_name=0x7f98540049d8 "t2", create_info=0x7f985bffd610, table_list=0x3682370, alter_info=0x2d369d0, order_num=0, order=0x0, ignore=false) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:7004
#14 0x000000000078ed1f in Alter_table_statement::execute (this=<optimized out>, thd=0x3682370) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_alter.cc:106
#15 0x000000000058ae8c in mysql_execute_command (thd=0x3682370) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:4615
#16 0x000000000058e643 in mysql_parse (thd=0x3682370, rawbuf=<optimized out>, length=57163584, parser_state=0x7f985bffebb0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:5844
#17 0x000000000058fcbd in dispatch_command (command=COM_QUERY, thd=0x3682370, packet=0x7f98540048e0 "ALTER TABLE query115301 . `t2` DROP COLUMN `c57`", packet_length=1543498904) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:1061
#18 0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#19 0x000000000062a691 in handle_one_connection (arg=0x3682370) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#20 0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#21 0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 29 (LWP 15716):
+bt
#0  0x00007f989734fd03 in select () from /lib64/libc.so.6
#1  0x00000000008ebd0f in os_thread_sleep (tm=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0thread.c:259
#2  0x00000000008d414d in log_check_margins () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/log/log0log.c:3175
#3  0x00000000009081c5 in log_free_check () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/include/log0log.ic:443
#4  row_ins_index_entry_low (mode=2, index=0x7f97f023dfa8, entry=0x7f97f02b8908, n_ext=0, thr=0x7f97f03aa0f0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2005
#5  0x000000000090a50f in row_ins_index_entry (thr=0x7f97f03aa0f0, entry=<optimized out>, index=0x7f97f023dfa8, n_ext=<optimized out>, foreign=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2288
#6  row_ins_index_entry_step (thr=0x7f97f03aa0f0, node=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2373
#7  row_ins (thr=0x7f97f03aa0f0, node=0x7f97f023dfa8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2505
#8  row_ins_step (thr=0x7f97f03aa0f0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2622
#9  0x00000000007fab86 in row_insert_for_mysql (mysql_rec=<optimized out>, prebuilt=0x7f97f03a8908) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c:1255
#10 0x00000000007e3381 in ha_innobase::write_row (this=0x7f97f0319540, record=0x7f97f02b9810 "") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/handler/ha_innodb.cc:6075
#11 0x000000000068d52d in handler::ha_write_row (this=0x7f97f0319540, buf=0x7f97f02b9810 "") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/handler.cc:5424
#12 0x00000000005ef68f in copy_data_between_tables (error_if_not_empty=false, keys_onoff=DISABLE, deleted=<optimized out>, copied=<optimized out>, order=0x0, order_num=0, ignore=false, create=..., to=0x7f97f02b7840, from=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:7370
#13 mysql_alter_table (thd=<optimized out>, new_db=<optimized out>, new_name=0x7f97f00be388 "t2", create_info=0x7f9883ce9610, table_list=0x36a7f60, alter_info=0x7f9883ce96f0, order_num=0, order=0x0, ignore=false) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:6674
#14 0x000000000078ed1f in Alter_table_statement::execute (this=<optimized out>, thd=0x36a7f60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_alter.cc:106
#15 0x000000000058ae8c in mysql_execute_command (thd=0x36a7f60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:4615
#16 0x000000000058e643 in mysql_parse (thd=0x36a7f60, rawbuf=<optimized out>, length=57318192, parser_state=0x7f9883ceabb0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:5844
#17 0x000000000058fcbd in dispatch_command (command=COM_QUERY, thd=0x36a7f60, packet=0x7f97f00be290 "ALTER TABLE query115280 . `t2` DROP COLUMN `c48`", packet_length=2211359896) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:1061
#18 0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#19 0x000000000062a691 in handle_one_connection (arg=0x36a7f60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#20 0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#21 0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 28 (LWP 12879):
+bt
#0  0x00007f9897ec9614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x3172280) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4681
#2  os_aio_linux_handle (global_seg=0, message1=0x7f989700be78, message2=0x7f989700be70, type=0x7f989700be68, space_id=0x7f989700be60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4826
#3  0x00000000008a775a in fil_aio_wait (segment=0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/fil/fil0fil.c:5559
#4  0x000000000081a5d0 in io_handler_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0start.c:485
#5  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 27 (LWP 12886):
+bt
#0  0x00007f9897ec9614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x3196ac0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4681
#2  os_aio_linux_handle (global_seg=7, message1=0x7f9885e7be78, message2=0x7f9885e7be70, type=0x7f9885e7be68, space_id=0x7f9885e7be60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4826
#3  0x00000000008a775a in fil_aio_wait (segment=7) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/fil/fil0fil.c:5559
#4  0x000000000081a5d0 in io_handler_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0start.c:485
#5  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 26 (LWP 15329):
+bt
#0  0x00007f98980d854d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x367ad68, complen=0x7f9883ca9dc8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:834
#2  0x000000000051ef3c in my_net_read (net=0x367ad68) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x367ab20) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:734
#4  0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#5  0x000000000062a691 in handle_one_connection (arg=0x367ab20) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 25 (LWP 15587):
+bt
#0  0x00007f989734fd03 in select () from /lib64/libc.so.6
#1  0x00000000008ebd0f in os_thread_sleep (tm=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0thread.c:259
#2  0x00000000008d414d in log_check_margins () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/log/log0log.c:3175
#3  0x00000000009081c5 in log_free_check () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/include/log0log.ic:443
#4  row_ins_index_entry_low (mode=2, index=0x7f97f40172a8, entry=0x7f97f406b428, n_ext=0, thr=0x7f97f4066ca8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2005
#5  0x000000000090a50f in row_ins_index_entry (thr=0x7f97f4066ca8, entry=<optimized out>, index=0x7f97f40172a8, n_ext=<optimized out>, foreign=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2288
#6  row_ins_index_entry_step (thr=0x7f97f4066ca8, node=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2373
#7  row_ins (thr=0x7f97f4066ca8, node=0x7f97f40172a8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2505
#8  row_ins_step (thr=0x7f97f4066ca8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2622
#9  0x00000000007fab86 in row_insert_for_mysql (mysql_rec=<optimized out>, prebuilt=0x7f97f40655a8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c:1255
#10 0x00000000007e3381 in ha_innobase::write_row (this=0x7f97f40454b0, record=0x7f97f405b1f0 "") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/handler/ha_innodb.cc:6075
#11 0x000000000068d52d in handler::ha_write_row (this=0x7f97f40454b0, buf=0x7f97f405b1f0 "") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/handler.cc:5424
#12 0x00000000005ef68f in copy_data_between_tables (error_if_not_empty=false, keys_onoff=DISABLE, deleted=<optimized out>, copied=<optimized out>, order=0x0, order_num=0, ignore=false, create=..., to=0x7f97f402b650, from=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:7370
#13 mysql_alter_table (thd=<optimized out>, new_db=<optimized out>, new_name=0x7f97f401c8c8 "t2", create_info=0x7f987f131610, table_list=0x35e46c0, alter_info=0x7f987f1316f0, order_num=0, order=0x0, ignore=false) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:6674
#14 0x000000000078ed1f in Alter_table_statement::execute (this=<optimized out>, thd=0x35e46c0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_alter.cc:106
#15 0x000000000058ae8c in mysql_execute_command (thd=0x35e46c0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:4615
#16 0x000000000058e643 in mysql_parse (thd=0x35e46c0, rawbuf=<optimized out>, length=56517264, parser_state=0x7f987f132bb0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:5844
#17 0x000000000058fcbd in dispatch_command (command=COM_QUERY, thd=0x35e46c0, packet=0x7f97f401c7d0 "ALTER TABLE query115328 . `t2` DROP COLUMN `c16`", packet_length=2131963032) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:1061
#18 0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#19 0x000000000062a691 in handle_one_connection (arg=0x35e46c0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#20 0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#21 0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 24 (LWP 12887):
+bt
#0  0x00007f9897ec9614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x3196ac0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4681
#2  os_aio_linux_handle (global_seg=8, message1=0x7f988547ae78, message2=0x7f988547ae70, type=0x7f988547ae68, space_id=0x7f988547ae60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4826
#3  0x00000000008a775a in fil_aio_wait (segment=8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/fil/fil0fil.c:5559
#4  0x000000000081a5d0 in io_handler_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0start.c:485
#5  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 23 (LWP 12885):
+bt
#0  0x00007f9897ec9614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x3196ac0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4681
#2  os_aio_linux_handle (global_seg=6, message1=0x7f988687ce78, message2=0x7f988687ce70, type=0x7f988687ce68, space_id=0x7f988687ce60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4826
#3  0x00000000008a775a in fil_aio_wait (segment=6) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/fil/fil0fil.c:5559
#4  0x000000000081a5d0 in io_handler_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0start.c:485
#5  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 22 (LWP 15289):
+bt
#0  0x00007f98980d854d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x3620b88, complen=0x7f983bffedc8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:834
#2  0x000000000051ef3c in my_net_read (net=0x3620b88) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x3620940) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:734
#4  0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#5  0x000000000062a691 in handle_one_connection (arg=0x3620940) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 21 (LWP 12888):
+bt
#0  0x00007f9897ec9614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x3196ac0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4681
#2  os_aio_linux_handle (global_seg=9, message1=0x7f9884a79e78, message2=0x7f9884a79e70, type=0x7f9884a79e68, space_id=0x7f9884a79e60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4826
#3  0x00000000008a775a in fil_aio_wait (segment=9) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/fil/fil0fil.c:5559
#4  0x000000000081a5d0 in io_handler_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0start.c:485
#5  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 20 (LWP 15311):
+bt
#0  0x00007f98980d854d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x365cc28, complen=0x7f9883deedc8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:834
#2  0x000000000051ef3c in my_net_read (net=0x365cc28) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x365c9e0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:734
#4  0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#5  0x000000000062a691 in handle_one_connection (arg=0x365c9e0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 19 (LWP 12884):
+bt
#0  0x00007f9897ec9614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x318e800) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4681
#2  os_aio_linux_handle (global_seg=5, message1=0x7f988727de78, message2=0x7f988727de70, type=0x7f988727de68, space_id=0x7f988727de60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4826
#3  0x00000000008a775a in fil_aio_wait (segment=5) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/fil/fil0fil.c:5559
#4  0x000000000081a5d0 in io_handler_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0start.c:485
#5  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 18 (LWP 12883):
+bt
#0  0x00007f9897ec9614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x318e800) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4681
#2  os_aio_linux_handle (global_seg=4, message1=0x7f9887c7ee78, message2=0x7f9887c7ee70, type=0x7f9887c7ee68, space_id=0x7f9887c7ee60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4826
#3  0x00000000008a775a in fil_aio_wait (segment=4) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/fil/fil0fil.c:5559
#4  0x000000000081a5d0 in io_handler_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0start.c:485
#5  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 17 (LWP 15309):
+bt
#0  0x00007f98980d854d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x36553d8, complen=0x7f9883e2fdc8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:834
#2  0x000000000051ef3c in my_net_read (net=0x36553d8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x3655190) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:734
#4  0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#5  0x000000000062a691 in handle_one_connection (arg=0x3655190) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 16 (LWP 12880):
+bt
#0  0x00007f9897ec9614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x3180540) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4681
#2  os_aio_linux_handle (global_seg=1, message1=0x7f9895edce78, message2=0x7f9895edce70, type=0x7f9895edce68, space_id=0x7f9895edce60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4826
#3  0x00000000008a775a in fil_aio_wait (segment=1) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/fil/fil0fil.c:5559
#4  0x000000000081a5d0 in io_handler_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0start.c:485
#5  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 15 (LWP 12882):
+bt
#0  0x00007f9897ec9614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x318e800) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4681
#2  os_aio_linux_handle (global_seg=3, message1=0x7f9894adae78, message2=0x7f9894adae70, type=0x7f9894adae68, space_id=0x7f9894adae60) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0file.c:4826
#3  0x00000000008a775a in fil_aio_wait (segment=3) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/fil/fil0fil.c:5559
#4  0x000000000081a5d0 in io_handler_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0start.c:485
#5  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 14 (LWP 15720):
+bt
#0  0x00007f989734fd03 in select () from /lib64/libc.so.6
#1  0x00000000008ebd0f in os_thread_sleep (tm=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0thread.c:259
#2  0x00000000008d414d in log_check_margins () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/log/log0log.c:3175
#3  0x00000000009081c5 in log_free_check () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/include/log0log.ic:443
#4  row_ins_index_entry_low (mode=2, index=0x7f97f0125d28, entry=0x7f97f035c918, n_ext=0, thr=0x7f97f0302d40) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2005
#5  0x000000000090a50f in row_ins_index_entry (thr=0x7f97f0302d40, entry=<optimized out>, index=0x7f97f0125d28, n_ext=<optimized out>, foreign=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2288
#6  row_ins_index_entry_step (thr=0x7f97f0302d40, node=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2373
#7  row_ins (thr=0x7f97f0302d40, node=0x7f97f0125d28) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2505
#8  row_ins_step (thr=0x7f97f0302d40) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2622
#9  0x00000000007fab86 in row_insert_for_mysql (mysql_rec=<optimized out>, prebuilt=0x7f97f03015a8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c:1255
#10 0x00000000007e3381 in ha_innobase::write_row (this=0x7f97f01f2fa0, record=0x7f97f009be30 "") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/handler/ha_innodb.cc:6075
#11 0x000000000068d52d in handler::ha_write_row (this=0x7f97f01f2fa0, buf=0x7f97f009be30 "") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/handler.cc:5424
#12 0x00000000005ef68f in copy_data_between_tables (error_if_not_empty=false, keys_onoff=(ENABLE | DISABLE), deleted=<optimized out>, copied=<optimized out>, order=0x0, order_num=0, ignore=false, create=..., to=0x7f97f00921b0, from=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:7370
#13 mysql_alter_table (thd=<optimized out>, new_db=<optimized out>, new_name=0x7f97f0066dd8 "t2", create_info=0x7f987f0af610, table_list=0x36a03e0, alter_info=0x7f987f0af6f0, order_num=0, order=0x0, ignore=false) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:6674
#14 0x000000000078ed1f in Alter_table_statement::execute (this=<optimized out>, thd=0x36a03e0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_alter.cc:106
#15 0x000000000058ae8c in mysql_execute_command (thd=0x36a03e0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:4615
#16 0x000000000058e643 in mysql_parse (thd=0x36a03e0, rawbuf=<optimized out>, length=57286576, parser_state=0x7f987f0b0bb0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:5844
#17 0x000000000058fcbd in dispatch_command (command=COM_QUERY, thd=0x36a03e0, packet=0x7f97f0066ce0 "ALTER TABLE query115288 . `t2` DROP COLUMN `c37`", packet_length=2131430552) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:1061
#18 0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#19 0x000000000062a691 in handle_one_connection (arg=0x36a03e0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#20 0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#21 0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 13 (LWP 15721):
+bt
#0  0x00007f989734fd03 in select () from /lib64/libc.so.6
#1  0x00000000008ebd0f in os_thread_sleep (tm=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0thread.c:259
#2  0x00000000008d414d in log_check_margins () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/log/log0log.c:3175
#3  0x00000000009081c5 in log_free_check () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/include/log0log.ic:443
#4  row_ins_index_entry_low (mode=2, index=0x7f97f012c2f8, entry=0x7f97f01fb248, n_ext=0, thr=0x7f97f0174770) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2005
#5  0x000000000090a50f in row_ins_index_entry (thr=0x7f97f0174770, entry=<optimized out>, index=0x7f97f012c2f8, n_ext=<optimized out>, foreign=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2288
#6  row_ins_index_entry_step (thr=0x7f97f0174770, node=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2373
#7  row_ins (thr=0x7f97f0174770, node=0x7f97f012c2f8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2505
#8  row_ins_step (thr=0x7f97f0174770) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0ins.c:2622
#9  0x00000000007fab86 in row_insert_for_mysql (mysql_rec=<optimized out>, prebuilt=0x7f97f0172fd8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0mysql.c:1255
#10 0x00000000007e3381 in ha_innobase::write_row (this=0x7f97f010fb70, record=0x7f97f0264370 "") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/handler/ha_innodb.cc:6075
#11 0x000000000068d52d in handler::ha_write_row (this=0x7f97f010fb70, buf=0x7f97f0264370 "") at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/handler.cc:5424
#12 0x00000000005ef68f in copy_data_between_tables (error_if_not_empty=false, keys_onoff=DISABLE, deleted=<optimized out>, copied=<optimized out>, order=0x0, order_num=0, ignore=false, create=..., to=0x7f97f0093150, from=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:7370
#13 mysql_alter_table (thd=<optimized out>, new_db=<optimized out>, new_name=0x7f97f0056ee8 "t2", create_info=0x7f9894056610, table_list=0x3698b90, alter_info=0x7f98940566f0, order_num=0, order=0x0, ignore=false) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:6674
#14 0x000000000078ed1f in Alter_table_statement::execute (this=<optimized out>, thd=0x3698b90) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_alter.cc:106
#15 0x000000000058ae8c in mysql_execute_command (thd=0x3698b90) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:4615
#16 0x000000000058e643 in mysql_parse (thd=0x3698b90, rawbuf=<optimized out>, length=57255776, parser_state=0x7f9894057bb0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:5844
#17 0x000000000058fcbd in dispatch_command (command=COM_QUERY, thd=0x3698b90, packet=0x7f97f0056df0 "ALTER TABLE query115268 . `t2` DROP COLUMN `c37`", packet_length=2483387544) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:1061
#18 0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#19 0x000000000062a691 in handle_one_connection (arg=0x3698b90) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#20 0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#21 0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 12 (LWP 15269):
+bt
#0  0x00007f98980d854d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x35ec158, complen=0x7f985bfbddc8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:834
#2  0x000000000051ef3c in my_net_read (net=0x35ec158) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x35ebf10) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:734
#4  0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#5  0x000000000062a691 in handle_one_connection (arg=0x35ebf10) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 11 (LWP 15281):
+bt
#0  0x00007f98980d854d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x3611ae8, complen=0x7f9883ff6dc8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:834
#2  0x000000000051ef3c in my_net_read (net=0x3611ae8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x36118a0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:734
#4  0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#5  0x000000000062a691 in handle_one_connection (arg=0x36118a0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 10 (LWP 15302):
+bt
#0  0x00007f98980d854d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x363eae8, complen=0x7f9883ef2dc8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:834
#2  0x000000000051ef3c in my_net_read (net=0x363eae8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x363e8a0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:734
#4  0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#5  0x000000000062a691 in handle_one_connection (arg=0x363e8a0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 9 (LWP 12900):
+bt
#0  0x00007f98980d854d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x354d4f8, complen=0x7f9894098dc8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:834
#2  0x000000000051ef3c in my_net_read (net=0x354d4f8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x354d2b0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:734
#4  0x000000000062a557 in do_handle_one_connection (thd_arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1497
#5  0x000000000062a691 in handle_one_connection (arg=0x354d2b0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 8 (LWP 12899):
+bt
#0  0x00007f98980d92a5 in sigwait () from /lib64/libpthread.so.0
#1  0x0000000000515bbb in signal_hand (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/mysqld.cc:2748
#2  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#3  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 7 (LWP 12896):
+bt
#0  0x00007f989734fd03 in select () from /lib64/libc.so.6
#1  0x00000000008ebd0f in os_thread_sleep (tm=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0thread.c:259
#2  0x00000000008d414d in log_check_margins () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/log/log0log.c:3175
#3  0x000000000090ab2d in log_free_check () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/include/log0log.ic:443
#4  row_purge_remove_sec_if_poss_leaf (node=0x3541f08, index=0x35270d8, entry=0x7f9840000ca8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0purge.c:365
#5  0x000000000090bd9a in row_purge_remove_sec_if_poss (entry=0x7f9840000ca8, index=0x35270d8, node=0x3541f08) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0purge.c:433
#6  row_purge_del_mark (node=0x3541f08) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0purge.c:484
#7  row_purge (thr=0x3541d50, node=0x3541f08) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0purge.c:765
#8  row_purge_step (thr=0x3541d50) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/row/row0purge.c:805
#9  0x000000000090015f in que_thr_step (thr=0x3541d50) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/que/que0que.c:1259
#10 que_run_threads_low (thr=0x3541d50) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/que/que0que.c:1319
#11 que_run_threads (thr=0x3541d50) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/que/que0que.c:1356
#12 0x0000000000823127 in trx_purge (limit=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/trx/trx0purge.c:1195
#13 0x000000000081a1ac in srv_purge_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0srv.c:4037
#14 0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#15 0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 6 (LWP 12894):
+bt
#0  0x00007f989734fd03 in select () from /lib64/libc.so.6
#1  0x00000000008ebd0f in os_thread_sleep (tm=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0thread.c:259
#2  0x00000000008135ca in srv_LRU_dump_restore_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0srv.c:2953
#3  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 5 (LWP 12893):
+bt
#0  0x00007f98980d57bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000008eaeb3 in os_cond_wait_timed (abstime=0x7f98819b8e10, mutex=0x2ff6680, cond=0x2ff66c0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0sync.c:171
#2  os_event_wait_time_low (event=0x2ff6680, time_in_usec=<optimized out>, reset_sig_count=1) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0sync.c:716
#3  0x000000000081705b in srv_monitor_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0srv.c:2544
#4  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#5  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 4 (LWP 12892):
+bt
#0  0x00007f98980d57bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000008eaeb3 in os_cond_wait_timed (abstime=0x7f98823b9d90, mutex=0x2ff6560, cond=0x2ff65a0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0sync.c:171
#2  os_event_wait_time_low (event=0x2ff6560, time_in_usec=<optimized out>, reset_sig_count=1) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0sync.c:716
#3  0x0000000000819845 in srv_error_monitor_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0srv.c:2907
#4  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#5  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 3 (LWP 12895):
+bt
#0  0x00007f989734fd03 in select () from /lib64/libc.so.6
#1  0x00000000008ebd0f in os_thread_sleep (tm=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0thread.c:259
#2  0x00000000008d414d in log_check_margins () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/log/log0log.c:3175
#3  0x0000000000817cc5 in log_free_check () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/include/log0log.ic:443
#4  srv_master_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0srv.c:3395
#5  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 2 (LWP 12891):
+bt
#0  0x00007f98980d57bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000008eaeb3 in os_cond_wait_timed (abstime=0x7f9882dbadb0, mutex=0x2ff65f0, cond=0x2ff6630) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0sync.c:171
#2  os_event_wait_time_low (event=0x2ff65f0, time_in_usec=<optimized out>, reset_sig_count=1) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/os/os0sync.c:716
#3  0x0000000000819c28 in srv_lock_timeout_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0srv.c:2694
#4  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#5  0x00007f989735711d in clone () from /lib64/libc.so.6

Thread 1 (LWP 12889):
+bt
#0  0x00007f98980d669c in pthread_kill () from /lib64/libpthread.so.0
#1  0x000000000068832e in handle_fatal_signal (sig=6) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/signal_handler.cc:249
#2  <signal handler called>
#3  0x00007f98972a18a5 in raise () from /lib64/libc.so.6
#4  0x00007f98972a3085 in abort () from /lib64/libc.so.6
#5  0x00000000008de092 in log_online_follow_log_group (contiguous_lsn=957953024, group=0x351dab8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/log/log0online.c:1038
#6  log_online_follow_redo_log () at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/log/log0online.c:1178
#7  0x0000000000813555 in srv_redo_log_follow_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0srv.c:3080
#8  0x00007f98980d1851 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f989735711d in clone () from /lib64/libc.so.6
+quit