linux-kernel - Re: shm updates broke UML

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Date:	Mon, 01 Aug 2011 19:19:19 +0200
From:	Marc Zyngier <marc.zyngier@....com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	Richard Weinberger <richard@....at>, <serge.hallyn@...onical.com>,
	<torvalds@...ux-foundation.org>, <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>,
	<user-mode-linux-devel@...ts.sourceforge.net>,
	<toralf.foerster@....de>
Subject: Re: shm updates broke UML


On Mon, 1 Aug 2011 21:10:42 +0400, Vasiliy Kulikov <segoon@...nwall.com>
wrote:
> On Mon, Aug 01, 2011 at 18:01 +0200, Marc Zyngier wrote:
>> It also breaks ARM (at least 11MPCore and Cortex A9).
>> The same workaround gets the kernel booting again.
> 
> Can you please apply this patch and show the output? 
> I suppose all numbers will be nonNULL and the last is NULL.

Here you go (sorry about the line wrapping, damned webmail...):

Calibrating local timer... 104.99MHz.
CPU1: Booted secondary processor
CPU1: Unknown IPI message 0x1
CPU2: Booted secondary processor
CPU2: Unknown IPI message 0x1
CPU3: Booted secondary processor
CPU3: Unknown IPI message 0x1
Brought up 4 CPUs
SMP: Total of 4 processors activated (333.41 BogoMIPS).
ns = c0447474, ids = c04474d0
ns = c0447474, ids = c04474d0
wait_list = c04474e0
next =   (null)
Unable to handle kernel NULL pointer dereference at virtual address
00000000
pgd = c0004000
[00000000] *pgd=00000000
Internal error: Oops: 805 [#1] SMP
Modules linked in:
CPU: 3    Not tainted  (3.0.0-next-20110801+ #808)
PC is at __down_write_nested+0x88/0xe0
LR is at __down_write_nested+0x18/0xe0
pc : [<c0320090>]    lr : [<c0320020>]    psr: 60000093
sp : df8d1f68  ip : 00000000  fp : 00000000
r10: 00000000  r9 : 00000000  r8 : c04474dc
r7 : c04474d8  r6 : 00000000  r5 : 00000002  r4 : df884380
r3 : df884388  r2 : 00000000  r1 : 60000013  r0 : c04474e0
Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 00c5787f  Table: 7000400a  DAC: 00000015
Process kworker/u:0 (pid: 19, stack limit = 0xdf8d0270)
Stack: (0xdf8d1f68 to 0xdf8d2000)
1f60:                   c04474e0 c031dae0 df884380 00000002 c0447474
c04474d8
1f80: 00000000 00000000 df8b0200 c015d9e4 df884380 00000000 00000000
c002e550
1fa0: 00000000 00000000 df8d0000 00000001 00000000 00000000 00000000
00000000
1fc0: 00000000 df823a00 df8d2000 fffffffe 00000013 00000000 00000000
00000000
1fe0: 00000000 c003eaac df823a00 c003e970 c000f630 c000f630 55555555
55555555
[<c0320090>] (__down_write_nested+0x88/0xe0) from [<c015d9e4>]
(exit_shm+0x48/0x8c)
[<c015d9e4>] (exit_shm+0x48/0x8c) from [<c002e550>] (do_exit+0x59c/0x750)
[<c002e550>] (do_exit+0x59c/0x750) from [<c003eaac>]
(____call_usermodehelper+0x13c/0x154)
[<c003eaac>] (____call_usermodehelper+0x13c/0x154) from [<c000f630>]
(kernel_thread_exit+0x0/0x8)
Code: 1afffffa e597c00c e58d0000 e587d00c (e58cd000) 
---[ end trace 1b75b31a2719ed1c ]---
Fixing recursive fault but reboot is needed!
NET: Registered protocol family 16
ns = c0447474, ids = c04474d0
wait_list = c04474e0
next =   (null)
ns = c0447474, ids = c04474d0
wait_list = c04474e0
next =   (null)
ns = c0447474, ids = c04474d0
wait_list = c04474e0
next =   (null)
wait_list = c04474e0
next =   (null)

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