linux-kernel - Re: [BUG] 2.6.29-rc3: bad PC value

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Message-ID: <alpine.DEB.1.10.0901290830140.13065@gandalf.stny.rr.com>
Date:	Thu, 29 Jan 2009 08:41:44 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Matthias Kaehlcke <matthias@...hlcke.net>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Abhishek Sagar <sagar.abhishek@...il.com>
Subject: Re: [BUG] 2.6.29-rc3: bad PC value


Hi Matthias,

Thanks for reporting this. Since each arch has to be ported separately, 
I've Cc'd Abhishek, who ported ftrace to ARM.

-- Steve



On Thu, 29 Jan 2009, Matthias Kaehlcke wrote:

> I run a 2.6.29-rc3 kernel on an ep9301 (ARM) platform. After
> activating the option CONFIG_FUNCTION_TRACER, the kernel generates the
> following Oops:
> 
> Unable to handle kernel NULL pointer dereference at virtual address 00000000
> pgd = c5790000
> [00000000] *pgd=0576f031, *pte=00000000, *ppte=00000000
> Internal error: Oops: 0 [#1] PREEMPT
> Modules linked in:
> CPU: 0    Not tainted  (2.6.29-rc3 #3)
> PC is at 0x0
> LR is at 0x4000d018
> pc : [<00000000>]    lr : [<4000d018>]    psr: 60000013
> sp : c5415be8  ip : 4000d008  fp : c5415c04
> r10: 00000204  r9 : 00000000  r8 : c5780518
> r7 : 00000000  r6 : c02eabdc  r5 : 04492000  r4 : c4454000
> r3 : 4000d024  r2 : 00000000  r1 : c4494000  r0 : c4456000
> Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
> Control: 0000717f  Table: 05790000  DAC: 00000015
> Process init (pid: 1, stack limit = 0xc5414268)
> Stack: (0xc5415be8 to 0xc5416000)
> 5be0:                   00000000 c5790000 00000001 c037fa80 c5415c54 c5415c08
> 5c00: c008f04c c002e98c 0007a000 c578dde0 00000001 c578dde0 00000001 0000006a
> 5c20: 0007a000 c0380240 c5415c54 c576f800 c576f9e8 c5412bc0 00000000 c5780518
> 5c40: 00000000 0007a000 c5415cb4 c5415c58 c0090388 c008ef34 0000006a 00000001
> 5c60: 00000000 c5415c70 c007f9f8 0000007a c5790000 00000800 c578dde0 000001e8
> 5c80: c5790000 c5415c90 c012fd98 00000000 0007a000 c5412bc0 c5780518 c578de14
> 5ca0: c578dde0 c5415dd0 c5415cfc c5415cb8 c021fb5c c0090100 0000006a 00000000
> 5cc0: c02bf5c4 00000800 00000805 0007aa99 c578056c c02a7f10 c5415e04 c02a7f60
> 5ce0: 00000805 c5415dd0 80000013 0007aa99 c5415d1c c5415d00 c021fcbc c021fa10
> 5d00: c02a7f10 c5415e04 c02a7f60 00000805 c5415dcc c5415d20 c0025268 c021fcb4
> 5d20: c5780584 08101877 c5780518 c578dde0 08101877 c56f8da0 00000001 c0093f38
> 5d40: c5415dac c5415d50 c0096778 c57804c4 c578dde4 c5780530 c0096778 c57804c4
> 5d60: 00000000 c5780530 c0096778 c009456c c57804c4 00000000 c5415db4 c5415d88
> 5d80: c0095004 c009456c c57805d8 c5415d98 c00a0f08 c57804c4 c57805d8 c578dde0
> 5da0: 0007b000 00100077 ffffffff c5415e04 0007aa99 0007a448 00000000 0007bd84
> 5dc0: c5415e2c c5415dd0 c021dc00 c002523c 0007aa99 00000567 00000000 00000000
> 5de0: 0007aa99 0007bd84 0007aa99 0007a448 00000000 c5777580 0007bd84 c5415e2c
> 5e00: 00000001 c5415e18 c00dc2cc c0128624 80000013 ffffffff 00000567 c00dc2cc
> 5e20: c5415edc c5415e30 c00dce2c c00dc294 00001812 00000000 c5414000 c5415f58
> 5e40: 00000003 c56f8920 00008000 00000000 00000001 c4034840 c5777480 00000000
> 5e60: 00000000 00008000 00072448 0007a448 0007aa99 c4017e60 00000003 c5415eb4
> 5e80: 00000000 00000007 00000001 c5414000 c5415ed4 c5415ea0 c00a9314 c0090a78
> 5ea0: 00000001 c037f0a0 c026f049 00000000 00000069 00000000 c02b0f80 c5777580
> 5ec0: c5414000 00000000 c00dc6b0 00000000 c5415f1c c5415ee0 c00a9840 c00dc6c0
> 5ee0: c4405000 c5415f58 c5777582 fffffffe c5415f58 00000000 c5414000 c5777580
> 5f00: 00000002 c02a78f8 c5415f58 c02a786c c5415f54 c5415f20 c00aaaa4 c00a9744
> 5f20: 00003fc0 00000000 00000020 c026f03e c02a78f8 c02a786c c5415f58 00000000
> 5f40: 00000000 00000000 c5415fbc c5415f58 c0028f70 c00aa8c8 00000000 00000000
> 5f60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 5f80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 5fa0: c02a78f8 c00203fc 00000000 00000000 c5415fd4 c5415fc0 c002555c c0028f3c
> 5fc0: c02c0098 c02c0098 c5415ff4 c5415fd8 c000843c c0025474 00000000 00000001
> 5fe0: 00000000 00000000 00000000 c5415ff8 c00478ec c0008384 e5851004 e585b000
> Backtrace:
> [<c002e97c>] (v4wb_copy_user_highpage+0x0/0xa4) from [<c008f04c>] (__do_fault+0x128/0x3a4)
>  r6:c037fa80 r5:00000001 r4:c5790000
> [<c008ef24>] (__do_fault+0x0/0x3a4) from [<c0090388>] (handle_mm_fault+0x298/0x6cc)
> [<c00900f0>] (handle_mm_fault+0x0/0x6cc) from [<c021fb5c>] (do_page_fault+0x15c/0x2a4)
> [<c021fa00>] (do_page_fault+0x0/0x2a4) from [<c021fcbc>] (do_translation_fault+0x18/0x80)
> [<c021f544>] (do_translation_fault+0x0/0x80) from [<c0025268>] (do_DataAbort+0x3c/0x9c)
>  r7:00000805 r6:c02a7f60 r5:c5415e04 r4:c02a7f10
> [<c002522c>] (do_DataAbort+0x0/0x9c) from [<c021d4a0>] (__dabt_svc+0x40/0x60)
> Exception stack(0xc5415dd0 to 0xc5415e18)
> 5dc0:                                     0007aa99 00000567 00000000 00000000
> 5de0: 0007aa99 0007bd84 0007aa99 0007a448 00000000 c55d0580 0007bd84 c5415e2c
> 5e00: 00000001 c5415e18 c00dbb68 c0127ec0 80000013 ffffffff
> [<c00dbb20>] (padzero+0x0/0x60) from [<c00dc6c8>] (load_elf_binary+0x77c/0x11c0)
> [<c00dbf4c>] (load_elf_binary+0x0/0x11c0) from [<c00a90dc>] (search_binary_handler+0x10c/0x2ec)
> [<c00a8fd0>] (search_binary_handler+0x0/0x2ec) from [<c00aa340>] (do_execve+0x1ec/0x2a8)
> [<c00aa154>] (do_execve+0x0/0x2a8) from [<c0028f70>] (kernel_execve+0x44/0x8c)
> [<c0028f2c>] (kernel_execve+0x0/0x8c) from [<c002555c>] (init_post+0xf8/0x180)
>  r7:00000000 r6:00000000 r5:c0020368 r4:c02a78f8
> [<c0025464>] (init_post+0x0/0x180) from [<c000843c>] (kernel_init+0xc8/0xf0)
>  r4:c02c0058
> [<c0008374>] (kernel_init+0x0/0xf0) from [<c00478ec>] (do_exit+0x0/0x764)
>  r5:00000000 r4:00000000
> Code: bad PC value.
> ---[ end trace e9ae1364e3c1e622 ]---
> note: init[1] exited with preempt_count 2
> Kernel panic - not syncing: Attempted to kill init!
> 
> -- 
> Matthias Kaehlcke
> Embedded Linux Engineer
> Barcelona
> 
>                 Don't walk behind me, I may not lead
>              Don't walk in front of me, I may not follow
>                 Just walk beside me and be my friend
>                           (Albert Camus)
>                                                                  .''`.
>     using free software / Debian GNU/Linux | http://debian.org  : :'  :
>                                                                 `. `'`
> gpg --keyserver pgp.mit.edu --recv-keys 47D8E5D4                  `-
> 
> 
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