linux-kernel - Re: [2.6.36-rc1] List corruption when using initrd.

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Message-Id: <201008180409.o7I49pof033727@www262.sakura.ne.jp>
Date:	Wed, 18 Aug 2010 13:09:51 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	hughd@...gle.com
Cc:	tim.c.chen@...ux.intel.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [2.6.36-rc1] List corruption when using initrd.

Hugh Dickins wrote:
> > "[2.6.36-rc1] Bugs in __free_pipe_info()".
> 
> That's good, but puzzling.  I'll mention it in the patch comment, since
> that's what you've found: but I've given up trying to understand how.

Yeah, it's puzzling. What I was doing is

  ./newns ./foo | grep -vF OK

where "./newns" calls mount("tmpfs") after clone(CLONE_NEWNS)
and ./foo calls chroot()/mount("tmpfs")/umount()/pivot_root() etc.

After applying your patch, I can no longer reproduce __free_pipe_info() errors.
I don't know why __free_pipe_info() errors are reported on "grep" rather than
"newns" or "foo". But if the cause of __free_pipe_info() errors was memory
corruption by the bug in shmem, it is possible that fixing the bug in shmem
solves __free_pipe_info() errors.

Thanks.
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