From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>,
Jens Axboe <jens.axboe@oracle.com>,
torvalds@linuxfoundation.org,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: 2.6.26-rc4: RIP __call_for_each_cic+0x20/0x50
Date: Wed, 4 Jun 2008 21:23:56 -0700 [thread overview]
Message-ID: <20080605042356.GA9102@linux.vnet.ibm.com> (raw)
In-Reply-To: <alpine.LFD.1.10.0806041129570.3473@woody.linux-foundation.org>
On Wed, Jun 04, 2008 at 11:32:03AM -0700, Linus Torvalds wrote:
>
>
> On Tue, 3 Jun 2008, Paul E. McKenney wrote:
> >
> > The fact that put_io_context() was called from exit_io_context() means
> > that this is the last thread of a process exiting. The fact that
> > cfq_free_io_context() was called (via cfq_dtor()) from put_io_context()
> > means that this was the last reference to the io_context. Yet when
> > we traverse the cic_list, part of it is corrupted -- ascii "k"s through
> > RAX and RBX.
>
> The "ascii 'k's" are just the slab POISON_FREE byte (0x6b).
>
> IOW, something simply kfree'd the memory too early, causing the list
> traversal to then break.
Hence the CFQ code perhaps just an innocent bystander in the wrong place
at the wrong time. Fair enough!
Thanx, Paul
next prev parent reply other threads:[~2008-06-05 4:24 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-27 22:55 2.6.25-$sha1: RIP call_for_each_cic+0x25/0x50 Alexey Dobriyan
2008-04-28 12:01 ` Andrew Morton
2008-04-28 12:04 ` Jens Axboe
2008-04-28 19:55 ` Alexey Dobriyan
2008-04-29 6:21 ` Alexey Dobriyan
2008-04-29 9:06 ` Jens Axboe
2008-04-30 22:12 ` Alexey Dobriyan
2008-05-04 19:08 ` Jens Axboe
2008-05-04 20:15 ` Alexey Dobriyan
2008-05-04 19:25 ` Jens Axboe
2008-05-04 21:17 ` Alexey Dobriyan
2008-05-10 10:37 ` 2.6.25-$sha1: RIP __call_for_each_cic+0x20/0x50 Alexey Dobriyan
2008-05-27 5:27 ` 2.6.26-rc4: " Alexey Dobriyan
2008-05-27 13:35 ` Jens Axboe
2008-05-27 15:18 ` Paul E. McKenney
2008-05-28 10:07 ` Jens Axboe
2008-05-28 10:30 ` Paul E. McKenney
2008-05-28 12:44 ` Jens Axboe
2008-05-28 13:20 ` Paul E. McKenney
2008-05-29 4:38 ` Paul E. McKenney
2008-05-29 6:26 ` Jens Axboe
2008-05-29 6:42 ` Jens Axboe
2008-05-29 9:17 ` Paul E. McKenney
2008-05-29 10:13 ` Jens Axboe
2008-05-29 11:25 ` Paul E. McKenney
2008-05-29 11:44 ` Jens Axboe
2008-05-29 12:11 ` Paul E. McKenney
2008-05-29 12:13 ` Jens Axboe
2008-05-30 11:04 ` Paul E. McKenney
2008-05-30 13:16 ` Paul E. McKenney
2008-05-30 18:34 ` Alexey Dobriyan
2008-06-04 3:31 ` Paul E. McKenney
2008-06-04 18:32 ` Linus Torvalds
2008-06-05 4:23 ` Paul E. McKenney [this message]
2008-06-06 14:49 ` Paul E. McKenney
2008-05-28 11:52 ` Fabio Checconi
2008-05-28 11:58 ` Jens Axboe
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