* Re: [brett@wrl.org: Stumped about where to post an Oops!]
[not found] ` <20040726133422.66c42143.akpm@osdl.org>
@ 2004-08-02 10:21 ` Stephen C. Tweedie
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From: Stephen C. Tweedie @ 2004-08-02 10:21 UTC (permalink / raw)
To: Andrew Morton
Cc: Marcelo Tosatti, Brett Charbeneau, Stephen Tweedie, linux-kernel
Hi,
On Mon, 2004-07-26 at 21:34, Andrew Morton wrote:
> The 0x00040004 access address almost looks like some pointer-poisoning
> thing.
It's the result of doing
> 0: 39 72 04 cmp %esi,0x4(%edx) <=====
when %edx is 0x00040000.
That looks to me like a single bit-flip in memory, and get_hash_table is
one of those functions that shows up in traces all the time when you've
got bad memory (it's one of the kernel's hottest functions for doing
list-walks over dynamically-allocated data structures.)
This footprint would definitely have me reaching for memtest86 as the
next step. It certainly has all the hallmarks of a classic bit-flip bad
memory trace.
--Stephen
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2004-08-02 10:21 ` [brett@wrl.org: Stumped about where to post an Oops!] Stephen C. Tweedie
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