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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: 2.6.20-mm2
Date: Mon, 19 Feb 2007 12:28:29 +0100
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Cc: linux-kernel@vger.kernel.org, Neil Brown <neilb@suse.de>,
       Jeff Garzik <jeff@garzik.org>, linux-ide@vger.kernel.org,
       Jens Axboe <jens.axboe@oracle.com>
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On Monday, 19 February 2007 01:00, Andrew Morton wrote:
> On Mon, 19 Feb 2007 00:25:48 +0100 "Rafael J. Wysocki" <rjw@sisk.pl> wrote:
> 
> > > netconsole is good.
> > 
> > I know. :-)
> > 
> > In the meantime, I've got something worse on another x86_64 box:
> > 
> > Asus Laptop ACPI Extras version 0.30
> >   L5D model detected, supported
> > audit(1171831698.918:2): audit_pid=4281 old=0 by auid=4294967295
> > general protection fault: 0000 [2] PREEMPT
> > last sysfs file: /class/net/eth2/carrier
> > CPU 0
> > Modules linked in: af_packet ipv6 snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device asus_acpi backlight button battery ac dm_mod pcmr
> > Pid: 178, comm: pdflush Not tainted 2.6.20-mm2 #1
> > RIP: 0010:[<ffffffff8034bce4>]  [<ffffffff8034bce4>] __make_request+0x134/0x370
> > RSP: 0000:ffff81005ed659a0  EFLAGS: 00010297
> > RAX: 00000000ffffffff RBX: 6b6b6b6b6b6b6b6b RCX: 000000000203396a
> > RDX: 0000000100000000 RSI: ffff810037b4dbb0 RDI: ffff81004683d8c0
> > RBP: ffff81005ed659f0 R08: ffff81004683d070 R09: ffff81003d333cc0
> > R10: 0000000000000000 R11: 0000000000000000 R12: ffff810037b4dbb0
> > R13: ffff81005daba3f0 R14: ffff810037daca90 R15: ffff81005daba3d0
> > FS:  00002ad4a29e6d00(0000) GS:ffffffff805db000(0000) knlGS:0000000000000000
> > CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> > CR2: 00002b6a345aa000 CR3: 0000000056585000 CR4: 00000000000006e0
> > Process pdflush (pid: 178, threadinfo ffff81005ed64000, task ffff810037b060c0)
> > Stack:  ffff810002852540 0000000000000001 ffff810037b4dbb0 ffffffff8026be21
> >  ffff81005ed65a40 0000000000000008 ffff810037b4dbb0 0000000000000800
> >  0000000000000008 ffff8100021d94e0 ffff81005ed65a40 ffffffff80348e7c
> > Call Trace:
> >  [<ffffffff8026be21>] mempool_alloc_slab+0x11/0x20
> >  [<ffffffff80348e7c>] generic_make_request+0x1ec/0x230
> 
> yeah. everyone except me is hitting that.

FWIW, I don't see it on an SMP machine.

On non-SMP it's reproducible, eg. by doing

# echo testproc > /sys/power/disk

and

# echo disk > /sys/power/state

for 3-4 times in a row.

Probably "sync" for a couple of times in a row would be sufficient.

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