Subject: Re: mysqld - innodb, pthread_mutex_unlock
To: None <>
From: rudolf <>
List: port-amd64
Date: 01/30/2006 18:05:27
rudolf wrote:
> Juan RP wrote:
>> On Mon, 30 Jan 2006 03:47:18 +0100
>> rudolf <> wrote:
>>> Hi,
>>> I have some problems with mysqld 5.0.18 (pkgsrc-2005Q4 with current 
>>> databases/mysql5-client and databases/mysql5-server) on an amd64 (one 
>>> Xeon) machine. The daemon refuses to start if it's configured to run 
>>> innodb engine and there are the innodb files present in mysql data 
>>> directory (it starts correctly only when it initially creates the
>>> innodb files, subsequent restart again fails). It is possible to
>>> start it correctly with "--skip-innodb", but once I also got:
>>> mysqld: Error detected by libpthread: Invalid mutex.
>>> Detected by file 
>>> "/home/builds/ab/netbsd-3-0-RELEASE/src/lib/libpthread/pthread_mutex.c", 
>>> line 334, function "pthread_mutex_unlock".
>>> See pthread(3) for information.
>>> Do you have any idea what could be wrong? (u)limits are stretched to 
>>> maximum for the process so this shouldn't be the problem. It's NetBSD 
>>> 3.0, amd64, 2G RAM, slightly modified GENERIC kernel.
>> For unknown reasons mysql is trying to unlock an invalid mutex,
>> the pthread library detects it and refuses to start.


I made two ktruss outputs:

# ktruss -i /usr/pkg/bin/mysqld_safe --user=mysql --datadir=/var/mysql 
--pid-file=/var/mysql/`/bin/hostname`.pid >> /tmp/file.ktruss
at the beginning there are no /var/mysql/ib* files - mysqld starts 
without problems, creating the innodb files at startup
the /var/mysql/ib* files are already created, mysqld gets sigill when it 
pread's ehmm ... something :)