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Date:	Wed, 23 Dec 2009 03:59:23 +0100
From:	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Oops] 2.6.33-rc1: kernel NULL pointer dereference in check_preempt_wakeup

Am Mittwoch 23 Dezember 2009 03:09:47 schrieb Américo Wang:
> On Wed, Dec 23, 2009 at 8:20 AM, Johannes Hirte
> 
> <johannes.hirte@....tu-ilmenau.de> wrote:
> > With 2.6.33-rc1 I have random hangs. Even SysRq-Key works, only hard
Aargh, should be: "Even SysRq-Key didn't work"

> > reset. I've had it mostly within X, where I didn't get any messages but
> > one time on console with the following trace:
> >
> > BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
> > IP [<ffffffff810263f1>1 check_preempt_wakeup+0xae/0x14e
> > PGD 10efa1067 PUD 11767a067 PMD 0
> > Oops: 0000 [#1] SMP
> > last sysfs file: /sys/devices/pci0000:00/0000:00:10.3/tempt1_input
> > CPU 0
> > Pid: 20108, comm: ebuild.sh Not tainted 2.6.33-rc1 #1 TYAN Tiger K8W Dual
> > AMD Opteron, S28755/To Be Filled By O.E.M.
> > RIP: 0010:[<ffffffff810263f1>] [<ffffffff810263f1>]
> > check_preempt_wakeup+0xae/0x14e RSP: 0018: ffff88006c0e3e50 EFALGS:
> > 000010087
> > RAX: ffff880028292420 RBX: 0000000000000000 RCX: 0000000000000000
> > RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000001200011
> > RBP: ffff880105a3eae0 R08: 0000000000000000 R09: 0000000000000001
> > R10: 0000000001200011 R11: ffff88011cdd0000 R12: ffff8800282123c0
> > R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000004ed0
> > FS:  00007f767a6aa700(0000) GS:ffff880028200000(0000)
> > knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> > CR2: 0000000000000090 CR§: 00000001061a3000 CR4: 00000000000006f0
> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> > Process ebuild.sh (pid: 20108, threadinfo ffff88006c0e2000, task
> > ffff880105a3eae0) Stack:
> >  ffff8800202123c0 ffff88009734c740 0000000001200011 ffff88009734c740
> > <0> 0000000000004ed0 ffffffff8102e329 0000000000000000 0000000000000286
> > <0> 00007f767a6aa9d0 0000000000000000 0000000000000000 ffffffff8103042d
> > Call Trace:
> >  [<ffffffff8102e329>] ?  wake_up_new_task+0x66/0x8f
> >  [<ffffffff8103042d>] ? do_fork+0x20f/0x273
> >  [<ffffffff810a5a9s>] ? alloc_fd+0x69/10a
> >  [<ffffffff8103a953>] ? sigprocmask+0x9f/0xc2
> >  [<ffffffff810020d3>] ? stub_clone+0x13/0x20
> >  [<ffffffff81001e6b>] ? system_call_fastpath+0x16/0x1b
> > Code: 8b 89 88 00 00 00 ff c0 48 85 c9 75 f2 eb 09 40 0b 9b 88 00 00 00
> > ff ca 39 c2 7f f3 eb 09 4d 8b b6 88 00 00 00 ff c8 39 d0 7f f3 <49> 8b 86
> > 90 00 00 00 48 39 83 90 00 00 00 75 74 4d 85 f6 75 04
> > RIP  [<ffffffff810263f1>] check_preempt_wakeup+0xae/0x14e
> >  RSP <ffff88006c0e3e50>
> > CR2: 0000000000000090
> > ---[ end trace f6bafb05b72ae358 ]---
> 
> Hmm, seems like the one Eric reported:
> http://lkml.org/lkml/2009/12/21/272
> 
> > Since the system didn't respond anymore, I had captured this with camera
> > and copied by hand. I hope I haven't made any mistakes when copying. The
> > picture wasn't very good.
> 
> Wow, hard work. :)
> 
> Can you try Peter's patch?
> 
> http://lkml.org/lkml/2009/12/22/124
> 
> Thanks!

I'll try it. The problem is, I haven't a workload, I can reproduce the hang 
reliably. :(

regards,
  Johannes
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