RSU processor remains hanging

Bug #1026181 reported by Seppo Jaakola on 2012-07-18
10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
MySQL patches by Codership
Status tracked in 5.6
5.5
Low
Seppo Jaakola
5.6
Low
Seppo Jaakola
Percona XtraDB Cluster moved to https://jira.percona.com/projects/PXC
Status tracked in 5.6
5.5
New
Undecided
Unassigned
5.6
Fix Released
Undecided
Unassigned

Bug Description

Howto reproduce:

1. run one node cluster with RSU enabled
2. issue high rate SQL write load on the node, e.e.g by sqlgen
3. through another connection, send safe DDL, e.g CREATE INDEX for one of the affected tables

If bug is present, the DDL will remain hanging

This seems to be a regression from one of the fixes introduced for: lp856162 => create a regression test

Related branches

Changed in codership-mysql:
status: New → In Progress
assignee: nobody → Seppo Jaakola (seppo-jaakola)
milestone: none → 5.5.25-23.7
importance: Undecided → Low
Seppo Jaakola (seppo-jaakola) wrote :

Regression test failed for wsrep-5.6 branch. Following assert was fired:

safe_mutex: Trying to unlock mutex that wasn't locked at /home/seppo/work/wsrep/wsrep-5.6-UKnoPA/wsrep-5.6/sql/mysqld.cc, line 5505
            Last used at /home/seppo/work/wsrep/wsrep-5.6-UKnoPA/wsrep-5.6/include/mysql/psi/mysql_thread.h, line: 1162
06:36:47 UTC - mysqld got signal 6 ;

...

stack_bottom = 7fa5f4046e48 thread_stack 0x40000
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld(my_print_stacktrace+0x38)[0xadeec7]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld(handle_fatal_signal+0x3f3)[0x74543d]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xfbb0)[0x7fa5f91d4bb0]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x37)[0x7fa5f8615f77]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x148)[0x7fa5f86195e8]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld(safe_mutex_unlock+0x8f)[0xae37e0]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld[0x615bf2]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld[0x6216ec]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld(_Z39wsrep_wait_committing_connections_closei+0xbc)[0x6217fc]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld[0x635e69]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld(_Z24wsrep_to_isolation_beginP3THDPcS1_PK10TABLE_LIST+0x3fe)[0x63682e]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x21e4)[0x7fb53f]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x421)[0x8059ff]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld[0x804fee]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x1067)[0x7f6e38]
2014-07-13 09:36:47 7832 [Note] WSREP: commit waiting for replaying: replayers 1, thd: (178) conflict: 0 (round: 1)
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld(_Z10do_commandP3THD+0x6c7)[0x7f593a]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x1be)[0x7bb863]
/home/seppo/work/testing/node1-shm-5.6/mysql/sbin/mysqld(handle_one_connection+0x33)[0x7bb366]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7f6e)[0x7fa5f91ccf6e]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fa5f86d99cd]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PXC-1232

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