[Lustre-discuss] Possible out of memory condition

Andreas Dilger adilger at sun.com
Mon Oct 27 12:38:53 PDT 2008

On Oct 27, 2008  10:16 -0600, Craig Tierney wrote:
> Andreas Dilger wrote:
>> Note that soft lockups are only a warning.  It shouldn't mean that the
>> node is completely dead, only that some thread was hogging the CPU.
> The two soft lockup messages (one in kswapd0 and the other in the user
> process convert_emiss) repeated their messages for 6 hours before I rebooted
> the node.  I don't recall if I could login to the node or not.

Ah, then the spewing of the "warning" messages is likely what caused the
node to be unusable :-(.  Console messages are printed with all interrupts
disabled and can be a problem in such cases.  Unfortunately, this printing
is outside of the Lustre code so we can't fix it without patching the kernel.

Cheers, Andreas
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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