linux-kernel - Re: [Oops] 2.6.33-rc1: kernel NULL pointer dereference in check_preempt

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Message-Id: <200912242027.47327.johannes.hirte@fem.tu-ilmenau.de>
Date:	Thu, 24 Dec 2009 20:27:46 +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 04:09:42 schrieb Américo Wang:
> On Wed, Dec 23, 2009 at 10:59 AM, Johannes Hirte
> 
> <johannes.hirte@....tu-ilmenau.de> wrote:
> > 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. :(
>
> Amazing...
> 
> If that patch doesn't work, please try run addr2line, something like:
> 
>  addr2line -e vmlinux ffffffff810263f1

After more than 24 hours without any hang I think the patch fixed it. Thank 
your for the hint.

regards,
  Johannes
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