+thread apply all bt

Thread 27 (LWP 17692):
+bt
#0  0x00007fd4531cec0d in fsync () from /lib64/libpthread.so.0
#1  0x00000000007aa2c8 in my_sync (fd=131, my_flags=48) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/mysys/my_sync.c:76
#2  0x00000000007aa3e9 in my_sync_dir (dir_name=<optimized out>, my_flags=16) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/mysys/my_sync.c:142
#3  0x00000000007aa457 in my_sync_dir_by_file (file_name=<optimized out>, my_flags=16) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/mysys/my_sync.c:182
#4  0x00000000006149dd in mysql_create_frm (thd=0x0, file_name=0x7fd4500ef260 "./query116853/#sql-4145_172.frm", db=0x7fd3b03f57c0 "\340\303\033\260\323\177", table=0x7fd40000007c "\324\177", create_info=<optimized out>, create_fields=..., keys=45, key_info=0x7fd3b03eaad0, db_file=0x7fd3b0299900) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/unireg.cc:452
#5  0x0000000000614c1a in rea_create_table (thd=0x21772d0, path=0x7fd4500f0180 "./query116853/#sql-4145_172", db=0x7fd3b005cc10 "query116853", table_name=0x7fd4500f1f60 "#sql-4145_172", create_info=0x7fd4500f2610, create_fields=..., keys=45, key_info=0x7fd3b03eaad0, file=0x7fd3b0299900) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/unireg.cc:519
#6  0x00000000005e8ff5 in mysql_create_table_no_lock (thd=0x21772d0, db=0x7fd3b005cc10 "query116853", table_name=0x7fd4500f1f60 "#sql-4145_172", create_info=0x7fd4500f2610, alter_info=0x7fd4500f26f0, internal_tmp_table=true, select_field_count=0, is_trans=0x0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:4323
#7  0x00000000005eda80 in mysql_alter_table (thd=<optimized out>, new_db=<optimized out>, new_name=0x7fd3b005cc28 "t17", create_info=0x7fd4500f2610, table_list=0x7fd3b005cc01, alter_info=0x7fd4500f26f0, order_num=0, order=0x0, ignore=false) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:6597
#8  0x000000000078ed1f in Alter_table_statement::execute (this=<optimized out>, thd=0x21772d0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_alter.cc:106
#9  0x000000000058ae8c in mysql_execute_command (thd=0x21772d0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:4615
#10 0x000000000058e643 in mysql_parse (thd=0x21772d0, rawbuf=<optimized out>, length=35098272, parser_state=0x7fd4500f3bb0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:5844
#11 0x000000000058fcbd in dispatch_command (command=COM_QUERY, thd=0x21772d0, packet=0x7fd3b005cb30 "ALTER TABLE query116853 . `t17` DROP COLUMN `c19`", packet_length=1343175832) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:1061
#12 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
#13 0x000000000062a691 in handle_one_connection (arg=0x21772d0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#14 0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#15 0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 26 (LWP 16925):
+bt
#0  0x00007fd4531cec0d in fsync () from /lib64/libpthread.so.0
#1  0x00000000007aa2c8 in my_sync (fd=112, my_flags=48) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/mysys/my_sync.c:76
#2  0x00000000007aa3e9 in my_sync_dir (dir_name=<optimized out>, my_flags=16) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/mysys/my_sync.c:142
#3  0x00000000007aa457 in my_sync_dir_by_file (file_name=<optimized out>, my_flags=16) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/mysys/my_sync.c:182
#4  0x00000000006149dd in mysql_create_frm (thd=0x0, file_name=0x7fd450171260 "./query116855/#sql-4145_3f.frm", db=0x7fd3b0050990 "P}6\260\323\177", table=0x7fd40000001f "", create_info=<optimized out>, create_fields=..., keys=1, key_info=0x7fd3b00059b0, db_file=0x7fd3b0324840) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/unireg.cc:452
#5  0x0000000000614c1a in rea_create_table (thd=0x215ae50, path=0x7fd450172180 "./query116855/#sql-4145_3f", db=0x7fd3b0004cd0 "query116855", table_name=0x7fd450173f60 "#sql-4145_3f", create_info=0x7fd450174610, create_fields=..., keys=1, key_info=0x7fd3b00059b0, file=0x7fd3b0324840) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/unireg.cc:519
#6  0x00000000005e8ff5 in mysql_create_table_no_lock (thd=0x215ae50, db=0x7fd3b0004cd0 "query116855", table_name=0x7fd450173f60 "#sql-4145_3f", create_info=0x7fd450174610, alter_info=0x7fd4501746f0, internal_tmp_table=true, select_field_count=0, is_trans=0x0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:4323
#7  0x00000000005eda80 in mysql_alter_table (thd=<optimized out>, new_db=<optimized out>, new_name=0x7fd3b0004ce8 "t17", create_info=0x7fd450174610, table_list=0x7fd3b0004d01, alter_info=0x7fd4501746f0, order_num=0, order=0x0, ignore=false) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:6597
#8  0x000000000078ed1f in Alter_table_statement::execute (this=<optimized out>, thd=0x215ae50) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_alter.cc:106
#9  0x000000000058ae8c in mysql_execute_command (thd=0x215ae50) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:4615
#10 0x000000000058e643 in mysql_parse (thd=0x215ae50, rawbuf=<optimized out>, length=34982432, parser_state=0x7fd450175bb0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:5844
#11 0x000000000058fcbd in dispatch_command (command=COM_QUERY, thd=0x215ae50, packet=0x7fd3b0004bf0 "ALTER TABLE query116855 . `t17` DROP COLUMN `c74`", packet_length=1343708312) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:1061
#12 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
#13 0x000000000062a691 in handle_one_connection (arg=0x215ae50) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#14 0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#15 0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 25 (LWP 17682):
+bt
#0  0x00007fd4531cec0d in fsync () from /lib64/libpthread.so.0
#1  0x00000000007aa2c8 in my_sync (fd=123, my_flags=48) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/mysys/my_sync.c:76
#2  0x00000000007aa3e9 in my_sync_dir (dir_name=<optimized out>, my_flags=16) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/mysys/my_sync.c:142
#3  0x00000000007aa457 in my_sync_dir_by_file (file_name=<optimized out>, my_flags=16) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/mysys/my_sync.c:182
#4  0x00000000006149dd in mysql_create_frm (thd=0x0, file_name=0x7fd4500ae260 "./query116849/#sql-4145_16e.frm", db=0x7fd3b02a4430 "p\342'\260\323\177", table=0x7fd400000075 "", create_info=<optimized out>, create_fields=..., keys=38, key_info=0x7fd3b0441240, db_file=0x7fd3b043f5f8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/unireg.cc:452
#5  0x0000000000614c1a in rea_create_table (thd=0x2169090, path=0x7fd4500af180 "./query116849/#sql-4145_16e", db=0x7fd3b0117b40 "query116849", table_name=0x7fd4500b0f60 "#sql-4145_16e", create_info=0x7fd4500b1610, create_fields=..., keys=38, key_info=0x7fd3b0441240, file=0x7fd3b043f5f8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/unireg.cc:519
#6  0x00000000005e8ff5 in mysql_create_table_no_lock (thd=0x2169090, db=0x7fd3b0117b40 "query116849", table_name=0x7fd4500b0f60 "#sql-4145_16e", create_info=0x7fd4500b1610, alter_info=0x7fd4500b16f0, internal_tmp_table=true, select_field_count=0, is_trans=0x0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:4323
#7  0x00000000005eda80 in mysql_alter_table (thd=<optimized out>, new_db=<optimized out>, new_name=0x7fd3b0117b58 "t17", create_info=0x7fd4500b1610, table_list=0x7fd3b0117b01, alter_info=0x7fd4500b16f0, order_num=0, order=0x0, ignore=false) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:6597
#8  0x000000000078ed1f in Alter_table_statement::execute (this=<optimized out>, thd=0x2169090) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_alter.cc:106
#9  0x000000000058ae8c in mysql_execute_command (thd=0x2169090) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:4615
#10 0x000000000058e643 in mysql_parse (thd=0x2169090, rawbuf=<optimized out>, length=35040352, parser_state=0x7fd4500b2bb0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:5844
#11 0x000000000058fcbd in dispatch_command (command=COM_QUERY, thd=0x2169090, packet=0x7fd3b0117a60 "ALTER TABLE query116849 . `t17` DROP COLUMN `c61`", packet_length=1342909592) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:1061
#12 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
#13 0x000000000062a691 in handle_one_connection (arg=0x2169090) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#14 0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#15 0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 24 (LWP 19555):
+bt
#0  0x00007fd4531cec0d in fsync () from /lib64/libpthread.so.0
#1  0x00000000007aa2c8 in my_sync (fd=126, my_flags=48) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/mysys/my_sync.c:76
#2  0x00000000007aa3e9 in my_sync_dir (dir_name=<optimized out>, my_flags=16) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/mysys/my_sync.c:142
#3  0x00000000007aa457 in my_sync_dir_by_file (file_name=<optimized out>, my_flags=16) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/mysys/my_sync.c:182
#4  0x00000000006149dd in mysql_create_frm (thd=0x0, file_name=0x7fd450130260 "./query116807/#sql-4145_25e.frm", db=0x7fd3b03e7de0 "\220\177'\260\323\177", table=0x7fd400000052 "", create_info=<optimized out>, create_fields=..., keys=51, key_info=0x7fd3b01f80a0, db_file=0x7fd3b02948c8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/unireg.cc:452
#5  0x0000000000614c1a in rea_create_table (thd=0x20cd2d0, path=0x7fd450131180 "./query116807/#sql-4145_25e", db=0x7fd3b0577560 "query116807", table_name=0x7fd450132f60 "#sql-4145_25e", create_info=0x7fd450133610, create_fields=..., keys=51, key_info=0x7fd3b01f80a0, file=0x7fd3b02948c8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/unireg.cc:519
#6  0x00000000005e8ff5 in mysql_create_table_no_lock (thd=0x20cd2d0, db=0x7fd3b0577560 "query116807", table_name=0x7fd450132f60 "#sql-4145_25e", create_info=0x7fd450133610, alter_info=0x7fd4501336f0, internal_tmp_table=true, select_field_count=0, is_trans=0x0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:4323
#7  0x00000000005eda80 in mysql_alter_table (thd=<optimized out>, new_db=<optimized out>, new_name=0x7fd3b0577578 "t1", create_info=0x7fd450133610, table_list=0x7fd3b0577501, alter_info=0x7fd4501336f0, order_num=0, order=0x0, ignore=false) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_table.cc:6597
#8  0x000000000078ed1f in Alter_table_statement::execute (this=<optimized out>, thd=0x20cd2d0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_alter.cc:106
#9  0x000000000058ae8c in mysql_execute_command (thd=0x20cd2d0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:4615
#10 0x000000000058e643 in mysql_parse (thd=0x20cd2d0, rawbuf=<optimized out>, length=34401952, parser_state=0x7fd450134bb0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:5844
#11 0x000000000058fcbd in dispatch_command (command=COM_QUERY, thd=0x20cd2d0, packet=0x7fd3b0577480 "ALTER TABLE query116807 . `t1` DROP COLUMN `c85`", packet_length=1343442072) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_parse.cc:1061
#12 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
#13 0x000000000062a691 in handle_one_connection (arg=0x20cd2d0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#14 0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#15 0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 23 (LWP 16712):
+bt
#0  0x00007fd452fbf614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x1c8b520) 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=0x7fd443c7ee78, message2=0x7fd443c7ee70, type=0x7fd443c7ee68, space_id=0x7fd443c7ee60) 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 22 (LWP 16715):
+bt
#0  0x00007fd452fbf614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x1c997e0) 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=0x7fd441e7be78, message2=0x7fd441e7be70, type=0x7fd441e7be68, space_id=0x7fd441e7be60) 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 21 (LWP 16726):
+bt
#0  0x00007fd4531cb43c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000008eb001 in os_cond_wait (mutex=0x0, cond=0x1cc4b20) 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=0x1cc4ae0, reset_sig_count=11) 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=0x182c630, index=0) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/sync/sync0arr.c:458
#4  0x000000000081fdec in mutex_spin_wait (mutex=0x1cc4528, file_name=0xa6adf0 "/ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/buf/buf0flu.c", line=1942) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/sync/sync0sync.c:653
#5  0x000000000086f453 in mutex_enter_func (line=1942, file_name=0xa6adf0 "/ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/buf/buf0flu.c", mutex=0x1cc4528) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/include/sync0sync.ic:222
#6  pfs_mutex_enter_func (line=1942, file_name=0xa6adf0 "/ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/buf/buf0flu.c", mutex=0x1cc4528) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/include/sync0sync.ic:251
#7  buf_flush_end (flush_type=BUF_FLUSH_LIST, buf_pool=0x1cc4528) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/buf/buf0flu.c:1942
#8  buf_flush_list (min_n=20, lsn_limit=18446744073709551615) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/buf/buf0flu.c:2076
#9  0x000000000081901a in srv_master_thread (arg=<optimized out>) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/srv/srv0srv.c:3747
#10 0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#11 0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 20 (LWP 16718):
+bt
#0  0x00007fd452fbf614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x1ca1aa0) 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=0x7fd440078e78, message2=0x7fd440078e70, type=0x7fd440078e68, space_id=0x7fd440078e60) 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 19 (LWP 16717):
+bt
#0  0x00007fd452fbf614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x1ca1aa0) 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=0x7fd440a79e78, message2=0x7fd440a79e70, type=0x7fd440a79e68, space_id=0x7fd440a79e60) 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 18 (LWP 16856):
+bt
#0  0x00007fd4531ce54d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x21309d8, complen=0x7fd45037ddc8) 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=0x21309d8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x2130790) 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=0x2130790) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 17 (LWP 16711):
+bt
#0  0x00007fd452fbf614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x1c7d260) 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=0x7fd452101e78, message2=0x7fd452101e70, type=0x7fd452101e68, space_id=0x7fd452101e60) 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 16 (LWP 16728):
+bt
#0  0x00007fd4531cf2a5 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#3  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 15 (LWP 16716):
+bt
#0  0x00007fd452fbf614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x1c997e0) 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=0x7fd44147ae78, message2=0x7fd44147ae70, type=0x7fd44147ae68, space_id=0x7fd44147ae60) 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 14 (LWP 16709):
+bt
#0  0x00007fd452443a63 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=48, argv=0x1801218) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/mysqld.cc:4822
#3  0x00007fd452383cdd in __libc_start_main () from /lib64/libc.so.6
#4  0x0000000000512049 in _start ()

Thread 13 (LWP 16714):
+bt
#0  0x00007fd452fbf614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x1c997e0) 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=0x7fd44287ce78, message2=0x7fd44287ce70, type=0x7fd44287ce68, space_id=0x7fd44287ce60) 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 12 (LWP 16727):
+bt
#0  0x00007fd452445d03 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  0x000000000081a35f 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:4047
#3  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 11 (LWP 16854):
+bt
#0  0x00007fd4531ce54d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x21298b8, complen=0x7fd4503bedc8) 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=0x21298b8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x2129670) 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=0x2129670) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 10 (LWP 16713):
+bt
#0  0x00007fd452fbf614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x1c997e0) 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=0x7fd44327de78, message2=0x7fd44327de70, type=0x7fd44327de68, space_id=0x7fd44327de60) 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 9 (LWP 16729):
+bt
#0  0x00007fd4531ce54d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x20583c8, complen=0x7fd450891dc8) 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=0x20583c8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x2058180) 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=0x2058180) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 8 (LWP 16850):
+bt
#0  0x00007fd4531ce54d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x2122798, complen=0x7fd4503ffdc8) 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=0x2122798) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x2122550) 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=0x2122550) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 7 (LWP 16808):
+bt
#0  0x00007fd4531ce54d in read () from /lib64/libpthread.so.0
#1  0x000000000051ebc4 in my_real_read (net=0x20e7158, complen=0x7fd450850dc8) 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=0x20e7158) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/net_serv.cc:1033
#3  0x0000000000590048 in do_command (thd=0x20e6f10) 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=0x20e6f10) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/sql/sql_connect.cc:1404
#6  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 6 (LWP 16723):
+bt
#0  0x00007fd4531cb7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000008eaeb3 in os_cond_wait_timed (abstime=0x7fd43c7c7d90, mutex=0x1b01540, cond=0x1b01580) 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=0x1b01540, 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 5 (LWP 16725):
+bt
#0  0x00007fd452445d03 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 4 (LWP 16720):
+bt
#0  0x00007fd452fbf614 in ?? () from /lib64/libaio.so.1
#1  0x00000000008e9583 in os_aio_linux_collect (seg_size=256, segment=<optimized out>, array=0x1ca1aa0) 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=0x7fd43ec76e78, message2=0x7fd43ec76e70, type=0x7fd43ec76e68, space_id=0x7fd43ec76e60) 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 3 (LWP 16724):
+bt
#0  0x00007fd4531cb7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000008eaeb3 in os_cond_wait_timed (abstime=0x7fd43bdc6e10, mutex=0x1b01660, cond=0x1b016a0) 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=0x1b01660, 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 2 (LWP 16722):
+bt
#0  0x00007fd4531cb7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000008eaeb3 in os_cond_wait_timed (abstime=0x7fd43d1c8db0, mutex=0x1b015d0, cond=0x1b01610) 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=0x1b015d0, 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  0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fd45244d11d in clone () from /lib64/libc.so.6

Thread 1 (LWP 16719):
+bt
#0  0x00007fd4531cc69c 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  0x00007fd4523978a5 in raise () from /lib64/libc.so.6
#4  0x00007fd452399085 in abort () from /lib64/libc.so.6
#5  0x000000000086b914 in buf_flush_remove (bpage=0x7fd443e05280) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/buf/buf0flu.c:544
#6  0x000000000086b957 in buf_flush_write_complete (bpage=0x7fd443e05280) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/buf/buf0flu.c:659
#7  0x0000000000865fb1 in buf_page_io_complete (bpage=0x7fd443e05280) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/buf/buf0buf.c:4186
#8  0x00000000008a78cb in fil_aio_wait (segment=8) at /ssd/QA-16274-5.5/Percona-Server-5.5.28-rel29.3/storage/innobase/fil/fil0fil.c:5611
#9  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
#10 0x00007fd4531c7851 in start_thread () from /lib64/libpthread.so.0
#11 0x00007fd45244d11d in clone () from /lib64/libc.so.6
+quit