Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poisonoverwritten

From: Ingo Molnar
Date: Fri Jul 18 2008 - 05:05:44 EST

* Vegard Nossum <vegard.nossum@xxxxxxxxx> wrote:

> But.. it could also be some random corruption coming from elsewhere.
> Maybe even bad RAM (it's just a single bit anyway). But that's less
> likely.

ok, i looked at the logs once more and while i thought that it occured
twice it only occured once:

Jul 17 20:22:14 europe kernel: BUG skbuff_head_cache: Poison overwritten

... this would explain why my attempts to bisect and reproduce it
failed. I got too excited about it being seemingly reproducible and
possibly bisectable (memory corruption bugs rarely are). My overnight
reboot-the-same-kernel tests didnt show anything either.

It's a known-reliable system with thousands of bootups:

Jul 17 20:20:54 europe kernel: Linux version 2.6.26-tip (mingo@europe)
(gcc version 4.2.2) #3094 SMP Thu Jul 17 20:19:27 CEST 2008

... but a hw fluke is never out of question. (It wasnt a particularly
hot day but the evening was unusually humid, maybe that made the

So lets close this for now, it's not a reproducible regression that we
can act upon. I'll update this thread if anything new happens.
Netconsole is reliable on this system in any case.

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