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SubjectRe: 2.6.9: unkillable processes during heavy IO
I had similar hanging with mysql on 64bit_debian@A64 3500+ + mysql 
4.1.5. 1GB memory.

After digging around I added "skip-concurrent-insert" to mysql conf and
those hangs disappeared.
It might be mysql problem (not kernel) on 64bit linux.

Although my mysql processess where killable with -9.

Lenar

Brad Fitzpatrick wrote:

>We have two database servers which freeze up during heavy IO load. The
>machines themselves are responsible, but the mysqld processes are forever
>locked, unkillable with even kill -9. I can't restart with MySQL without
>rebooting the machines.
>
>I can reasonable rule out hardware, since this is happening in the
>same way on two identical machines.
>
>I'd like to know how I can debug this, to file a proper bug report.
>
>The hardware/software stack is:
>
> - Dual Opteron 246, SMP kernel, w/ NUMA
> - 9 GB of memory (4GB in one zone, 5GB in the other)
> - MySQL, running mostly InnoDB, but some MyISAM
> - MegaRAID raid-10
> - device mapper
> - XFS (used as both O_DIRECT from InnoDB and regularly from MyISAM)
>
>At this point I'm going to try changing different variables on
>different machines in order to try and isolate it, but it's a slow
>process.
>
> - on raw partions, instead of device mapper
> - ext3 instead of XFS
> - not using O_DIRECT
>
>

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