Author:
Date:
Subject:
Evgeniy Polyakov
2008-07-21 15:25:15
Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison overwritten
On Mon, Jul 21, 2008 at 12:50:51PM +0200, Ingo Molnar ([email protected]) wrote:
> > Ingo do you see other similar dumps with last byte modified? That's
> > the one which can help to determine the reason.
>
> the problem is, most of the crashes dont come with any usable dump. This
> is a laptop so netconsole is the only reliable route out - and if
> something in networking crashes chances are that it hoses netconsole
> before it can get anything out.
>
> Another thing is that i'm activating netconsole on this box via a kernel
> boot line and from within a bzImage (to get it activated as early as
> possible) - maybe that's a tad too early for certain initialization
> sequences?
>
> I could try run tests with netconsole deactivated, if you think that's a
> worthwile line of probing this problem. (although that would make me do
> blind tests in essence - having kernel log output is really essential.)
Let's try this way first. If system will continue to crash, we will add
some debug options in various pathes. Existing reports do not contain
enough information unfortunately, so we will not lose too much.
--
Evgeniy Polyakov
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Author:
Date:
Subject:
Ingo Molnar
2008-07-21 13:55:55
Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison
overwritten
* Evgeniy Polyakov <[email protected]> wrote:
> > I could try run tests with netconsole deactivated, if you think
> > that's a worthwile line of probing this problem. (although that
> > would make me do blind tests in essence - having kernel log output
> > is really essential.)
>
> Let's try this way first. If system will continue to crash, we will
> add some debug options in various pathes. Existing reports do not
> contain enough information unfortunately, so we will not lose too
> much.
ok. I've turned off netconsole - 8 successful bootups in a row so far.
The box is a slow booter/builder with an 8 kernels/hour test throughput,
so if everything goes fine we should have meaningful results in about 10
hours.
( there are other, faster testboxes in -tip testing with 33 kernels/hour
build+boot throughput where we'd have to wait only 2 hours - but as
per Murphy's law they dont trigger this bug ;-)
Ingo
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Author:
Date:
Subject:
Christoph Lameter
2008-07-18 08:55:59
Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison overwritten
>> INFO: 0xf658ae9c-0xf658ae9c. First byte 0x6a instead of 0x6b
>
> 0x6b is POISON_FREE so 0x6a is one bit corruption.
Typically this means that a refcount at the head of the object was decremented. But the object was already freed.
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