From: Linus Torvalds <torvalds@linux-foundation.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
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 11:32:03 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.1.10.0806041129570.3473@woody.linux-foundation.org> (raw)
In-Reply-To: <20080604033118.GA10171@linux.vnet.ibm.com>
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.
Linus
next prev parent reply other threads:[~2008-06-04 18:33 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 [this message]
2008-06-05 4:23 ` Paul E. McKenney
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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