Re: Mysql Dying at random times - points to a lib issue? - sollved Sortof

Just to follow up to my own post (and adding FreeBSD
Questions)- I wanted to share that oddly enough, going
backwards and installing FreeBSD 4.11 with Mysql 4.11
With LinuxThreads solved the problem of the database
dying!

 I would love any opinions on why this could be.
 
 It seems to have found a possible SCSI issue, but so
far MYSQL hasn't died in 36 hrs. it usualy was at
least once every 8-12.

 Thanks

  NMH


The hardware..
 Tyan S2882 MB with one Opteron 248 - 4 gigs of ram
 Was FreeBSD 5.4-RELEASE-p6 i386 
 Now FreeBSD 4.11-STABLE i386 
 Infortrend RAID unit with 4 channels.
 3 channels of RAID 1 storage with heavy databases
tables on seperate arrays. (symlinked) and one channel
for binlogs.


--- NMH <[email protected]> wrote:

> 
>  Hello..
> 
>  Currently, our mysql database is crashing at random
> intervals though out the day during heavy load.  A
> mysql support engineer traced the problem to 
> libthr.  
> 
> 
>  #0 0x28619dfe in mutex_self_lock (mutex=0x0,
> noblock=0) at
> /usr/src/lib/libthr/thread/thr_mutex.c:615
> 615 PANIC("Shouldn't resume here?\n");
> 
>  The Database server is running i386 FreeBSD 5.4
> Release-P6, with 4 gigs of ram, on an  
> AMD Opteron(tm) Processor 248 (2191.84-MHz 686-class
> CPU). W/ infotrend raiding solution. 
> 
>  Apparently, there have been some updates (beyond my
> ability to understand) to the libthr package, which
> have not yet been backported to the 5.4 
> release...?? (changes in 6.0 that seem pertinant) 
> 
>  We have attempted to use KSE, and pthreads Binary
> from MYSQL,  but we encountered even WORSE problems
> with those packages.
>  The mysqld would consistantly crash in those
> threading
>  packages, usually within a minute or so of
> testing...
>  Usually with a message 
>  that a junk pointer was being released. (Error came
> from malloc.c).
> 
>  We were able to reproduce the memory problem on a
> seperate machine with a different hardware
> configuration, but same OS.  And on other machines
> with the same hardware configuration.
> 
> 
>  A mysql support engineer is currently checking
> around
> to see if there are any solutions, but meanwhile...
> I
> thought many heads are better than one.
> 
>  All of these problems started when we migrated to
> this new server, which hardware wise was very
> similiar
> to the old one. However the old one was running
> Mysql
> 4.0.18 and FreeBSD 5.1-Release-P11. 
>  According to /usr/src/UPDATING some lib changes
> occured after this time. 
> 
>  Currenly, on their suggestion, we are using
> /etc/libmap.conf entry of 
>  libpthread.so 	libthr.so
>  libpthread.co.1  libthr.so.1
>  
>  Which seems backwards to what people on here have
> recommended. But seemed to help but we are still
> crashing at least once a day sometimes more.
> 
> 
>  Any pointers, tips etc quite welcomed.
> 
>  Thanks!
>

The Large Print Giveth And The Small Print Taketh Away
 -- Anon


		
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