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

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Date:	Wed, 12 Aug 2009 09:47:53 +0200
From:	Robert Schwebel <r.schwebel@...gutronix.de>
To:	Juergen Beisert <jbe@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-hotplug@...r.kernel.org, Mel Gorman <mel@....ul.ie>
Subject: Re: Patch "page-allocator: preserve PFN ordering when __GFP_COLD
	is set" fails on my system

Hi Jürgen,

adding the patch author to Cc: ...

rsc

On Tue, Aug 11, 2009 at 06:30:02PM +0200, Juergen Beisert wrote:
> 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     |
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