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Warning: thr_alarm queue is full errors and panic with invalid backtrace

P: n/a
I'm running mysql in a 3 server configuration, with 2 servers being slaves to the first. I'm running vpopmail, which means a connection every incoming mail and every check. I woke up this morning to a mysql that wasn't answering connections, and that had left this in the log:

030716 13:48:06 InnoDB: Started
mysqld got signal 11;
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.

Fatal signal 11 while backtracing
030716 13:48:07 mysqld restarted

Before this, I got thousands of these:
Warning: thr_alarm queue is full

I checked the logs of the other 2 replication clients, and they also had the alarm queue error, and were also sucking up large resources. I was not able to connect to them, either.

Before those, both replication clients had this logged:
030716 13:42:45 Slave: received 0 length packet from server, apparent master shutdown:
030716 13:42:45 Slave I/O thread: Failed reading log event, reconnecting to retry, log 'courtney-bin.016' position 38236125
030716 13:42:45 Slave I/O thread: error reconnecting to master 'username-changeed@ip-address-changed:3306': Error: 'Can't connect to MySQL server on 'ip-address-changed' (61)' errno: 2003 retry-time: 10 retries: 86400

How-To-Repeat: I'm not sure what is triggering this. I was hoping the backtrace might help on that, but crashing while getting a backtrace isn't exactly promising. I have dome some small amount of tuning, which involves setting the max_connections to 500 and max_connect_errors to 50, on all machines. The binary log on the master server is rotated nightly and kept around for about a week.
Fix: Unknown. I restarted all 3 mysqld processes and it seems to be going ok now.
Submitter-Id: <submitter ID>
Originator: User &
Organization: MySQL support: none
Synopsis: Warning: thr_alarm queue is full errors and panic with invalid backtrace
Severity: serious
Priority: medium
Category: mysql
Class: sw-bug
Release: mysql-4.0.13 (FreeBSD port: mysql-server-4.0.13_1)
Server: /usr/local/bin/mysqladmin Ver 8.40 Distrib 4.0.13, for portbld-freebsd4.8 on i386 Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL license

Server version 4.0.13-log
Protocol version 10
Connection Localhost via UNIX socket
UNIX socket /tmp/mysql.sock
Uptime: 23 min 12 sec

Threads: 11 Questions: 37671 Slow queries: 0 Opens: 42 Flush tables: 1 Open tables: 36 Queries per second avg: 27.062C compiler: 2.95.4
C++ compiler: 2.95.4

System: FreeBSD 4.8-RELEASE FreeBSD 4.8-RELEASE #2: Fri Jun 20 11:39:35 PDT 2003 ad*** i386
Some paths: /usr/bin/perl /usr/bin/make /usr/local/bin/gmake /usr/bin/gcc /usr/bin/cc
GCC: Using builtin specs.
gcc version 2.95.4 20020320 [FreeBSD]
Compilation info: CC='cc' CFLAGS='-O -pipe -O3 -fno-omit-frame-pointer' CXX='cc' CXXFLAGS='-O -pipe -O3 -fno-omit-frame-pointer -felide-constructors -fno-rtti -fno-exceptions' LDFLAGS='' ASFLAGS=''
-r--r--r-- 1 root wheel 1223544 Jun 20 14:26 /usr/lib/libc.a
lrwxr-xr-x 1 root wheel 9 Jun 20 14:26 /usr/lib/ ->
-r--r--r-- 1 root wheel 577872 Jun 20 14:26 /usr/lib/
Configure command: ./configure '--localstatedir=/var/db/mysql' '--without-debug' '--without-readline' '--without-bench' '--without-extra-tools' '--with-libwrap' '--with-mysqlfs' '--with-vio' '--with-low-memory' '--with-comment=FreeBSD port: mysql-server-4.0.13_1' '--enable-thread-safe-client' '--enable-assembler' '--with-berkeley-db' '--prefix=/usr/local' '--build=i386-portbld-freebsd4.8' 'CFLAGS=-O -pipe -O3 -fno-omit-frame-pointer' 'CXX=cc' 'build_alias=i386-portbld-freebsd4.8' 'CC=cc' 'CXXFLAGS=-O -pipe -O3 -fno-omit-frame-pointer -felide-constructors -fno-rtti -fno-exceptions'
Perl: This is perl, version 5.005_03 built for i386-freebsd

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Jul 19 '05 #1
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