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Date: Fri, 8 Sep 2006 12:43:22 -0700
From: Andrew Morton <akpm@osdl.org>
To: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>
Subject: Re: 2.6.18-rc6-mm1
Message-Id: <20060908124322.ba462903.akpm@osdl.org>
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On Fri, 08 Sep 2006 21:23:10 +0200
Michal Piotrowski <michal.k.k.piotrowski@gmail.com> wrote:

> Hi,
> 
> Andrew Morton wrote:
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc6/2.6.18-rc6-mm1/
> > 
> > - autofs4 mounting of NFS is still sick.
> 
> BUG: unable to handle kernel paging request at virtual address fdb52df8
>  printing eip:
>  c013894c
> *pde = 37c85067
> *pte = 00000000
> Oops: 0000 [#1]
> 4K_STACKS PREEMPT SMP
> last sysfs file: /devices/platform/i2c-9191/9191-0290/temp2_input
> Modules linked in: ipv6 af_packet ip_conntrack_netbios_ns ipt_REJECT xt_state ip_conntrack
> nfnetlink xt_tcpudp iptable_filter ip_tables x_tables cpufreq_userspace p4_clockmod speedstep_lib binfmt_misc thermal proces
> sor fan container evdev snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_se
> q_device sk98lin snd_pcm_oss snd_mixer_oss snd_pcm skge snd_timer snd soundcore snd_page_alloc ide_cd i2c_i801 iTCO_wdt inte
> l_agp cdrom agpgart rtc unix
> CPU:    0
> EIP:    0060:[<c013894c>]    Not tainted VLI
> EFLAGS: 00210212   (2.6.18-rc6-mm1 #115)
> EIP is at __module_text_address+0xf/0x5c
> eax: fdb54000   ebx: fdb67c04   ecx: f7c10000   edx: fdb52d00
> esi: 000000fa   edi: f7c10f9c   ebp: 00000005   esp: f7c10e68
> ds: 007b   es: 007b   ss: 0068
> Process udevd (pid: 20250, ti=f7c10000 task=f7c21000 task.ti=f7c10000)
> Stack: f7c10000 c5f36030 c012fb6c f7c10000 c014f61b c0341710 000284d0 00000010
>        f7c21000 00000002 f7c10000 00200202 f57ce3c0 f52a8bfc f57ce3c0 f76a6ca4
>       f4a3c800 c01575e4 f52a8bfc f7d31ec0 f76a6ca4 80010000 c015894c f76a6ca4
> Call Trace:
> [<c012fb6c>] __kernel_text_address+0x18/0x23
> [<c014f61b>] __alloc_pages+0x301/0x313
> [<c01575e4>] __pte_alloc+0xf/0x78
> [<c015894c>] copy_page_range+0x139/0x3dd
> [<c011e67b>] copy_process+0xc1e/0x13cf
> [<c011f001>] do_fork+0xb6/0x1d2
> [<c017cdfa>] mntput_no_expire+0x11/0x81
> [<c010122e>] sys_clone+0x28/0x2d
> [<c0102fc6>] sysenter_past_esp+0x5f/0x85
> [<c0110033>] wakeup_pmode_return+0x33/0x55
> =======================
> Code: 31 c0 5b 5e 5f 5d c3 83 01 01 83 51 04 00 8b 12 31 c0 81 fa 10 eb 33 c0 0f 45 c2 c3 5
> 6 53 89 c1 8b 15 10 eb 33 c0 83 ea 04 eb 20 <8b> b2 f8 00 00 00 8b 82 e8 00 00 00 39 c1 72 23 01 f0 39 c1 73
> Sep  8 20:23:34 euridica kernel: EIP: [<c013894c>] __module_text_address+0xf/0x5c SS:ESP 0068:f7c10e68

boggle.  Your modules list seems to have got trashed.

Presumably setting CONFIG_PAGE_OWNER=n will make that go away.

What were you doing when this happened?  That output is not present in
http://www.stardust.webpages.pl/files/mm/2.6.18-rc6-mm1/mm-dmesg

> config file -> http://www.stardust.webpages.pl/files/mm/2.6.18-rc6-mm1/mm-config
> Unfortunately, this kernel was build without debugging symbols. I'll try to reproduce this oops with CONFIG_DEBUG_*=y.
> 
> Ingo, can you take a look at this?
> 
> BUG: warning at /usr/src/linux-mm/kernel/lockdep.c:2359/check_flags()
>  [<c01041ca>] dump_trace+0x63/0x1ca
>  [<c0104343>] show_trace_log_lvl+0x12/0x25
>  [<c01049a3>] show_trace+0xd/0x10
>  [<c0104a68>] dump_stack+0x16/0x18
>  [<c0138553>] check_flags+0x92/0x220
>  [<c013b033>] lock_acquire+0x3a/0x88
>  [<c0136d32>] down_write+0x28/0x43
>  [<c0164a9b>] sys_brk+0x20/0xd6
>  [<c0103166>] sysenter_past_esp+0x5f/0x99
> DWARF2 unwinder stuck at sysenter_past_esp+0x5f/0x99
> 
> Leftover inexact backtrace:
> 
>  =======================
> irq event stamp: 603424
> hardirqs last  enabled at (603423): [<c0103238>] restore_nocheck+0x12/0x15
> hardirqs last disabled at (603424): [<c0103173>] sysenter_past_esp+0x6c/0x99
> softirqs last  enabled at (603376): [<c0126a61>] __do_softirq+0xe4/0xea
> softirqs last disabled at (603371): [<c0105b3b>] do_softirq+0x6d/0x11f
> 

That's

	DEBUG_LOCKS_WARN_ON(!current->hardirqs_enabled);

and as far as I can see there was no preceding oops.
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