linux-kernel - Re: 2.6.38-rc3 regression on parisc: segfaults

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Date:	Fri, 4 Feb 2011 10:20:05 -0500
From:	"Carlos O'Donell" <carlos@...temhalted.org>
To:	John David Anglin <dave.anglin@...-cnrc.gc.ca>
Cc:	Meelis Roos <mroos@...ux.ee>, linux-parisc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.38-rc3 regression on parisc: segfaults

On Fri, Feb 4, 2011 at 10:07 AM, John David Anglin
<dave@...uly1.hia.nrc.ca> wrote:
> On Fri, 04 Feb 2011, Meelis Roos wrote:
>
>> 2363  clone( <unfinished ...>
>> 2349  <... futex resumed> )             = 1
>> 2363  <... clone resumed> child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x460df4a8) = 2372
>> 2349  --- SIGSEGV (Segmentation fault) @ 0 (0) ---
>> 2372  rt_sigaction(SIGPIPE, {SIG_DFL, [], SA_RESTART},  <unfinished ...>
>> 2349  write(1, "\33[56;1H\33[34h\33[?25h", 18 <unfinished ...>
>>
>> Something futex-related. Full log temprarilty available at
>> http://www.cs.ut.ee/~mroos/aptitude-strace.txt
>
> This is possibly the infamous COW bug.

The COW bug that is triggered by a COW from an LWS-CAS? The solution
to which is to use locks around the LWS-CAS even on UP? I'd forgotten
about this issue actually, I should push that patch out to James.

Cheers,
Carlos.
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