Thread 31 (Thread 0x7fe880379700 (LWP 27989)):
+bt
#0  0x00007fe89a82343c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x000000000095e366 in os_cond_wait (event=0x23225e0, reset_sig_count=114) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x23225e0, reset_sig_count=114) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/os/os0sync.c:609
#3  0x0000000000865158 in sync_array_wait_event (arr=0x1c12e90, index=0) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/sync/sync0arr.c:458
#4  0x0000000000866bac in mutex_spin_wait (mutex=0x2021ea0, file_name=0xb390f0 "/mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c", line=540) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/sync/sync0sync.c:653
#5  0x00000000008c454b in mutex_enter_func (mutex=0x2021ea0, file_name=0xb390f0 "/mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c", line=540) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/include/sync0sync.ic:222
#6  pfs_mutex_enter_func (mutex=0x2021ea0, file_name=0xb390f0 "/mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c", line=540) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/include/sync0sync.ic:251
#7  0x00000000008c6581 in buf_flush_remove (bpage=0x7fe887fa2100) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c:540
#8  0x00000000008c68ad in buf_flush_write_complete (bpage=0x7fe887fa2100) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c:676
#9  0x00000000008c42a0 in buf_page_io_complete (bpage=0x7fe887fa2100) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0buf.c:4110
#10 0x00000000009051f3 in fil_aio_wait (segment=7) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/fil/fil0fil.c:5719
#11 0x0000000000860b2f in io_handler_thread (arg=<value optimized out>) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/srv/srv0start.c:489
#12 0x00007fe89a81f851 in start_thread () from /lib64/libpthread.so.0
#13 0x00007fe89915394d in clone () from /lib64/libc.so.6

Thread 19 (Thread 0x7fe875ac4700 (LWP 27998)):
+bt
#0  0x00007fe89a82343c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x000000000095e366 in os_cond_wait (event=0x2022140, reset_sig_count=668) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x2022140, reset_sig_count=668) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/os/os0sync.c:609
#3  0x0000000000865158 in sync_array_wait_event (arr=0x1c12e90, index=1) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/sync/sync0arr.c:458
#4  0x0000000000866bac in mutex_spin_wait (mutex=0x20218f8, file_name=0xb390f0 "/mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c", line=1311) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/sync/sync0sync.c:653
#5  0x00000000008c454b in mutex_enter_func (mutex=0x20218f8, file_name=0xb390f0 "/mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c", line=1311) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/include/sync0sync.ic:222
#6  pfs_mutex_enter_func (mutex=0x20218f8, file_name=0xb390f0 "/mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c", line=1311) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/include/sync0sync.ic:251
#7  0x00000000008c7cd0 in buf_flush_page (buf_pool=0x20218f8, bpage=0x7fe887f9d900, flush_type=BUF_FLUSH_LIST) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c:1311
#8  0x00000000008c8c15 in buf_flush_try_neighbors (space=0, offset=321, flush_type=BUF_FLUSH_LIST, n_flushed=85, n_to_flush=132) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c:1541
#9  0x00000000008c9247 in buf_flush_page_and_try_neighbors (bpage=<value optimized out>, flush_type=BUF_FLUSH_LIST, n_to_flush=132, count=0x7fe875ac35f8) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c:1641
#10 0x00000000008c9522 in buf_flush_flush_list_batch (buf_pool=0x20218f8, flush_type=BUF_FLUSH_LIST, min_n=132, lsn_limit=236773032) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c:1771
#11 buf_flush_batch (buf_pool=0x20218f8, flush_type=BUF_FLUSH_LIST, min_n=132, lsn_limit=236773032) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c:1851
#12 0x00000000008c96a6 in buf_flush_list (min_n=132, lsn_limit=236773032) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0flu.c:2068
#13 0x000000000085f08c in srv_master_thread (arg=<value optimized out>) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/srv/srv0srv.c:3654
#14 0x00007fe89a81f851 in start_thread () from /lib64/libpthread.so.0
#15 0x00007fe89915394d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fe8942ae700 (LWP 28020)):
+bt
#0  0x00007fe89a82469c in pthread_kill () from /lib64/libpthread.so.0
#1  0x0000000000803126 in my_write_core (sig=6) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/mysys/stacktrace.c:433
#2  0x00000000006c3c09 in handle_fatal_signal (sig=6) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/sql/signal_handler.cc:250
#3  <signal handler called>
#4  0x00007fe89909d8e5 in raise () from /lib64/libc.so.6
#5  0x00007fe89909f0c5 in abort () from /lib64/libc.so.6
#6  0x00000000008ce8ad in buf_flush_or_remove_pages (buf_pool=0x20218f8, id=4877) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0lru.c:613
#7  buf_flush_dirty_pages (buf_pool=0x20218f8, id=4877) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0lru.c:676
#8  0x00000000008d14db in buf_LRU_flush_or_remove_pages (id=4877, buf_remove=BUF_REMOVE_FLUSH_NO_WRITE) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/buf/buf0lru.c:872
#9  0x0000000000903383 in fil_delete_tablespace (id=4877, evict_all=0) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/fil/fil0fil.c:2493
#10 0x000000000083be76 in row_drop_table_for_mysql (name=0x7fe83c1038d8 "test/t", trx=<value optimized out>, drop_db=<value optimized out>) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/row/row0mysql.c:3582
#11 0x0000000000818710 in ha_innobase::delete_table (this=<value optimized out>, name=<value optimized out>) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/storage/innobase/handler/ha_innodb.cc:8535
#12 0x00000000006cbf6a in handler::ha_delete_table (this=0x7fe83c1fa810, name=0x7fe8942ab690 "./test/t") at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/sql/handler.cc:3694
#13 0x00000000006cc1c0 in ha_delete_table (thd=0x2529040, table_type=<value optimized out>, path=0x7fe8942ab690 "./test/t", db=0x7fe83c0053d8 "test", alias=0x7fe83c004e78 "t", generate_warning=true) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/sql/handler.cc:2237
#14 0x0000000000612c41 in mysql_rm_table_no_locks (thd=0x2529040, tables=0x7fe83c004eb0, if_exists=true, drop_temporary=false, drop_view=false, dont_log_query=false) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/sql/sql_table.cc:2269
#15 0x0000000000613644 in mysql_rm_table (thd=0x2529040, tables=0x7fe83c004eb0, if_exists=1 '\001', drop_temporary=0 '\000') at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/sql/sql_table.cc:1960
#16 0x00000000005a8159 in mysql_execute_command (thd=0x2529040) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/sql/sql_parse.cc:3345
#17 0x00000000005ab71c in mysql_parse (thd=0x2529040, rawbuf=0x7fe83c004dd0 "DROP TABLE IF EXISTS t", length=<value optimized out>, parser_state=0x7fe8942acd10) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/sql/sql_parse.cc:5918
#18 0x00000000005aceaf in dispatch_command (command=COM_QUERY, thd=0x2529040, packet=<value optimized out>, packet_length=23) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/sql/sql_parse.cc:1075
#19 0x00000000005aebb3 in do_command (thd=0x2529040) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/sql/sql_parse.cc:789
#20 0x000000000067ddeb in threadpool_process_request (thd=0x2529040) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/sql/threadpool_common.cc:240
#21 0x000000000069f164 in handle_event (param=0x1163400) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/sql/threadpool_unix.cc:1547
#22 worker_main (param=0x1163400) at /mnt/workspace/percona-server-5.5-nightly-debug-binaries/label_exp/centos6-64/sql/threadpool_unix.cc:1595
#23 0x00007fe89a81f851 in start_thread () from /lib64/libpthread.so.0
#24 0x00007fe89915394d in clone () from /lib64/libc.so.6