[Lustre-discuss] Looping in __d_lookup

Robin Humble rjh+lustre at cita.utoronto.ca
Thu May 22 08:51:53 PDT 2008


On Thu, May 22, 2008 at 12:51:42AM -0400, Robin Humble wrote:
>On Wed, May 21, 2008 at 08:04:27PM -0600, Andreas Dilger wrote:
>>On May 21, 2008  21:05 +0200, Jakob Goldbach wrote:
>>> I'm running 1.6.4.3 patchless as well against an 2.6.18 vanilla kernel.
>>> Or at least that is what I thought. OpenVz patch effectively makes the
>>> kernel a 2.6.18++ kernel because they add features from newer kernels in
>>> their maintained 2.6.18 based kernel.  
>>> 
>>> So the lockup in __d_lookup may just relate to newer patchless clients. 
>>> 
>>> I got a debug patch from the OpenVz community which indicate dcache
>>> chain corruption in a lustre code path. 
>>
>>Do you have the fixes for the statahead patches, disable statahead via
>>"echo 0 > /proc/fs/lustre/llite/*/statahead_max", or can you try out the
>>v1_6_5_RC4 tag from CVS (which also contains those patches)?
>
>all of our __d_lookup soft lockups have been when running with 0 in
>/proc/fs/lustre/llite/*/statahead_max
>
>I'll try v1_6_5_RC4 now - should be fun :-)

unfortunately patched v1_6_5_RC4 doesn't appear to be workable on
2.6.23 and 2.6.24 kernels. see the other thread.

cheers,
robin



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