linux-kernel - Patch "page-allocator: preserve PFN ordering when __GFP

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Date:	Tue, 11 Aug 2009 18:30:02 +0200
From:	Juergen Beisert <jbe@...gutronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-hotplug@...r.kernel.org
Subject: Patch "page-allocator: preserve PFN ordering when __GFP_COLD is set" fails on my system

Hi,

I get the following Ooops message when "udevadm" is running on an ARM S3C2440
CPU based system:

[...]
starting udevd...done
Unable to handle kernel paging request at virtual address e3540000
pgd = c39d4000
[e3540000] *pgd=00000000
Internal error: Oops: 5 [#1]
Modules linked in:
CPU: 0    Not tainted  (2.6.31-rc4-00296-ge084b2d-dirty #10)
PC is at strlen+0xc/0x20
LR is at kobject_get_path+0x24/0xa4
pc : [<c0115338>]    lr : [<c0111f48>]    psr: a0000013
sp : c39bdea0  ip : 00000005  fp : c029645b
r10: c02e0430  r9 : 00000000  r8 : c3802c60
r7 : c001de30  r6 : 000000d0  r5 : 00000001  r4 : c001de30
r3 : e3550001  r2 : e3540000  r1 : 000000d0  r0 : e3540000
Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: c000717f  Table: 339d4000  DAC: 00000015
Process udevadm (pid: 325, stack limit = 0xc39bc270)
Stack: (0xc39bdea0 to 0xc39be000)
dea0: c001de28 00000003 c393d778 c399d000 c3802c60 c014dce0 c029645b c0112200
dec0: c393d778 00000000 00000003 c393d780 c399d000 c0112400 00000000 00020001
dee0: c0307fdc 00000000 c3950960 c027ddc3 c380cda0 c343b3d4 c3811e60 00000000
df00: 00000000 c393d778 00000003 c3960520 c393d780 c02e0470 c3960538 c39bdf88
df20: 00019cb0 c014dd80 c382db20 00000000 c3960538 c38ede7c 00000003 c014d464
df40: c38ede7c c00bf224 c382db20 00019cb0 c39bdf88 00000004 00000003 c39bc000
df60: 00000000 c0080bd8 c343b3d4 00000020 00000000 00000000 c382db20 00000004
df80: c0022fa8 c0080d38 00000000 00000000 bead3250 00000000 00026d98 00000003
dfa0: bead3250 c0022e00 00026d98 00000003 00000003 00019cb0 00000003 00000000
dfc0: 00026d98 00000003 bead3250 00000004 00022a90 bead3678 00019cb0 00019cb0
dfe0: 00022a94 bead3250 00018114 400d8f1c 40000010 00000003 00000000 00000000
[<c0115338>] (strlen+0xc/0x20) from [<c0111f48>] (kobject_get_path+0x24/0xa4)
[<c0111f48>] (kobject_get_path+0x24/0xa4) from [<c014dce0>] (dev_uevent+0x1dc/0x208)
[<c014dce0>] (dev_uevent+0x1dc/0x208) from [<c0112400>] (kobject_uevent_env+0x18c/0x3a8)
[<c0112400>] (kobject_uevent_env+0x18c/0x3a8) from [<c014dd80>] (store_uevent+0x74/0x88)
[<c014dd80>] (store_uevent+0x74/0x88) from [<c014d464>] (dev_attr_store+0x20/0x28)
[<c014d464>] (dev_attr_store+0x20/0x28) from [<c00bf224>] (sysfs_write_file+0x104/0x13c)
[<c00bf224>] (sysfs_write_file+0x104/0x13c) from [<c0080bd8>] (vfs_write+0xb0/0x15c)
[<c0080bd8>] (vfs_write+0xb0/0x15c) from [<c0080d38>] (sys_write+0x40/0x6c)
[<c0080d38>] (sys_write+0x40/0x6c) from [<c0022e00>] (ret_fast_syscall+0x0/0x2c)
Code: c02dbe78 e1a02000 ea000000 e2800001 (e5d03000)
---[ end trace 4d391449ae70e71a ]---
Segmentation fault
[...]

This Oops does not occure in v2.6.31-rc4 and occures in v2.6.31-rc5. Bisected
to the commit:

e084b2d95e48b31aa45f9c49ffc6cdae8bdb21d4
"page-allocator: preserve PFN ordering when __GFP_COLD is set"

But its curious: The same binary kernel still runs without this oops on an ARM
S3C2410 CPU.

Regards,
Juergen

-- 
Pengutronix e.K.                              | Juergen Beisert             |
Linux Solutions for Science and Industry      | Phone: +49-8766-939 228     |
Vertretung Sued/Muenchen, Germany             | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686              | http://www.pengutronix.de/  |
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