From: Andrew Morton <akpm@digeo.com>
To: Nuno Monteiro <nuno@itsari.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Sleeping function called from illegal context at slab.c:1378
Date: Mon, 23 Sep 2002 14:30:05 -0700 [thread overview]
Message-ID: <3D8F87DD.E330A36E@digeo.com> (raw)
In-Reply-To: 20020923204916.GA915@hobbes.itsari.int
Nuno Monteiro wrote:
>
> On 23.09.02 21:21 Andrew Morton wrote:
>
> <snip snip>
>
> I got two more. Its 2.5.38-mm2 too. Just thought I'd throw them in:
>
> Sleeping function called from illegal context at slab.c:1378
> c2e73f6c c0110251 c020b800 c020faf0 00000562 000001d0 c0129080 c020faf0
> 00000562 00000060 00000008 0000012c c11e3560 c010ac77 00000080
> 000001d0
> c2e72000 00000000 0000012c bffff948 00000000 c0106ff7 00000060
> 00000008
> Call Trace: [<c0110251>] [<c0129080>] [<c010ac77>] [<c0106ff7>]
>
> Trace; c0110251 <__might_sleep+55/64>
> Trace; c0129080 <kmalloc+4c/130>
> Trace; c010ac77 <sys_ioperm+7f/124>
> Trace; c0106ff7 <syscall_call+7/b>
sys_ioperm() is calling kmalloc(GFP_KERNEL) inside preempt_disable()
(via get_cpu()). That's incorrect because the kmalloc could sleep,
and switch CPUs.
> ...
>
> Trace; c0110251 <__might_sleep+55/64>
> Trace; c012ba45 <__alloc_pages+25/218>
> Trace; c012bc60 <__get_free_pages+28/78>
> Trace; c0143cb7 <__pollwait+33/98>
> Trace; c4b28deb <[snd-pcm-oss]snd_pcm_oss_poll+47/108>
> Trace; c0143ec5 <do_select+101/210>
> Trace; c0144342 <sys_select+346/4a0>
> Trace; c0143707 <sys_ioctl+23b/294>
> Trace; c0106ff7 <syscall_call+7/b>
>
snd_pcm_oss_poll() calls poll_wait() inside runtime->lock.
poll_wait() does __get_free_page(GFP_KERNEL).
This is a bug in snd_pcm_oss_poll().
next prev parent reply other threads:[~2002-09-23 21:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1032804558.28404.13.camel@spc9.esa.lanl.gov>
2002-09-23 18:30 ` Sleeping function called from illegal context at slab.c:1378 Andrew Morton
2002-09-23 20:00 ` Steven Cole
2002-09-23 20:21 ` Andrew Morton
2002-09-23 20:43 ` Steven Cole
2002-09-23 20:49 ` Nuno Monteiro
2002-09-23 21:30 ` Andrew Morton [this message]
2002-09-24 13:34 ` James Morris
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