CURRENT_TEST: main.1st
130226  0:42:30 [Warning] The syntax '--log' is deprecated and will be removed in a future release. Please use '--general-log'/'--general-log-file' instead.
130226  0:42:30 [Warning] The syntax '--log-slow-queries' is deprecated and will be removed in a future release. Please use '--slow-query-log'/'--slow-query-log-file' instead.
130226  0:42:30 [Note] Plugin 'FEDERATED' is disabled.
130226  0:42:30 InnoDB: The InnoDB memory heap is disabled
130226  0:42:30 InnoDB: Mutexes and rw_locks use GCC atomic builtins
130226  0:42:30 InnoDB: Compressed tables use zlib 1.2.3
130226  0:42:30 InnoDB: Using Linux native AIO
130226  0:42:30 InnoDB: Initializing buffer pool, size = 128.0M
130226  0:42:30 InnoDB: Completed initialization of buffer pool
130226  0:42:30 InnoDB: highest supported file format is Barracuda.
130226  0:42:30  InnoDB: Waiting for the background threads to start
130226  0:42:31 Percona XtraDB (http://www.percona.com) 1.1.8-rel29.3 started; log sequence number 1597945
130226  0:42:31 [Warning] /ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld: unknown option '--loose-skip-ndbcluster'
130226  0:42:31 [Warning] /ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld: unknown option '--loose-debug-assert-if-crashed-table'
130226  0:42:31 [Warning] /ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld: unknown option '--loose-debug-assert-on-error'
130226  0:42:31 [Warning] 'user' entry 'root@fusion1.office.percona.com' ignored in --skip-name-resolve mode.
130226  0:42:31 [Warning] 'proxies_priv' entry '@ root@fusion1.office.percona.com' ignored in --skip-name-resolve mode.
130226  0:42:31 [Note] Event Scheduler: Loaded 0 events
130226  0:42:31 [Note] /ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld: ready for connections.
Version: '5.5.29-rel29.3-log'  socket: '/ssd/qa/149/current1_4/tmp/master.sock'  port: 13060  Percona Server with XtraDB (GPL), Release rel29.3, Revision 450
130226  2:10:03  InnoDB: Assertion failure in thread 140194512672512 in file fil0fil.c line 2415
InnoDB: Failing assertion: node->n_pending == 0
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to http://bugs.mysql.com.
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.
23:10:03 UTC - mysqld got signal 6 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed, 
something is definitely wrong and this may fail.
Please help us make Percona Server better by reporting any
bugs at http://bugs.percona.com/

key_buffer_size=1048576
read_buffer_size=131072
max_used_connections=42
max_threads=153
thread_count=35
connection_count=35
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 61640 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x237d040
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 7f8194208e68 thread_stack 0x40000
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld(my_print_stacktrace+0x35)[0x7deff5]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld(handle_fatal_signal+0x3f4)[0x69ad04]
/lib64/libpthread.so.0(+0xf500)[0x7f8198c51500]
/lib64/libc.so.6(gsignal+0x35)[0x7f8197e198a5]
/lib64/libc.so.6(abort+0x175)[0x7f8197e1b085]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld[0x8c02da]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld[0x811f96]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld[0x7f3461]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld(_Z15ha_delete_tableP3THDP10handlertonPKcS4_S4_b+0x101)[0x69ff81]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld(_Z14quick_rm_tableP10handlertonPKcS2_j+0x12d)[0x5e2c3d]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld(_Z17mysql_alter_tableP3THDPcS1_P24st_ha_create_informationP10TABLE_LISTP10Alter_infojP8st_orderb+0x27d0)[0x5e5430]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld(_ZN21Alter_table_statement7executeEP3THD+0x450)[0x7c2000]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld(_Z21mysql_execute_commandP3THD+0x2026)[0x57feb6]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x3c3)[0x584413]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x14aa)[0x5858da]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld(_Z10do_commandP3THD+0x104)[0x585c64]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld(_Z24do_handle_one_connectionP3THD+0x114)[0x623a84]
/ssd/qa/Percona-Server-5.5.28-rel29.3-450.Linux.x86_64/bin/mysqld(handle_one_connection+0x54)[0x623b74]
/lib64/libpthread.so.0(+0x7851)[0x7f8198c49851]
/lib64/libc.so.6(clone+0x6d)[0x7f8197ecf11d]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7f8130015be0): ALTER TABLE query118598 . `t14` DROP COLUMN `c42`
Connection ID (thread ID): 143
Status: NOT_KILLED

You may download the Percona Server operations manual by visiting
http://www.percona.com/software/percona-server/. You may find information
in the manual which will help you identify the cause of the crash.
Writing a core file