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Date:	Thu, 24 Jul 2008 14:03:50 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Ingo Molnar <mingo@...e.hu>
CC:	David Miller <davem@...emloft.net>, herbert@...dor.apana.org.au,
	w@....eu, davidn@...idnewall.com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, stefanr@...6.in-berlin.de,
	rjw@...k.pl, ilpo.jarvinen@...sinki.fi,
	Dave Jones <davej@...hat.com>
Subject: Re: [regression] nf_iterate(), BUG: unable to handle kernel NULL
 pointer dereference

Ingo Molnar wrote:
> * Ingo Molnar <mingo@...e.hu> wrote:
> 
>> here's a new type of crash a -tip testbox triggered today:
>>
>> BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
>> IP: [<0000000000000000>] 0x0
>> PGD 0 
>> Oops: 0010 [1] PREEMPT 
>> CPU 0 
>> Pid: 5331, comm: ssh Not tainted 2.6.26 #21613
>> RIP: 0010:[<0000000000000000>]  [<0000000000000000>] 0x0
>> RSP: 0018:ffff88003b959a70  EFLAGS: 00010217
>> RAX: ffff88003b9ba91c RBX: ffff88003b9baac0 RCX: 0000000000000002
>> RDX: ffff88003b9baac0 RSI: 0000000000000014 RDI: ffff88003b9ba3d8
>> RBP: ffff88003b959a98 R08: ffff88003e434130 R09: ffff88003b9598b8
>> R10: 0000000000002000 R11: 00000000d85507ac R12: ffff88003b9ba3d8
>> R13: 0000000000000002 R14: ffff88003e06a020 R15: 0000000000000000
>> FS:  00007fb2b7806780(0000) GS:ffffffff80c1c180(0000) knlGS:0000000000000000
>> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
>> CR2: 0000000000000000 CR3: 000000003b9e8000 CR4: 00000000000006a0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>> Process ssh (pid: 5331, threadinfo ffff88003b958000, task ffff88003b99a000)
>> Stack:  ffffffff80777f25 ffff88003b959a98 ffffffff80c24170 ffff88003b959b28
>>  0000000000000004 ffff88003b959ae8 ffffffff80733107 ffff88003b959ab8
>>  ffff88003b9ba3d8 ffffffff80c1ed60 0000000000000004 ffff88003b9ba3d8
>> Call Trace:
>>  [<ffffffff80777f25>] ? ipv4_confirm+0x8d/0x122
>>  [<ffffffff80733107>] nf_iterate+0x43/0xa5

Does reverting 31d8519c fix this?
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