Re: 2.6.18-rc4-mm1

["Michal Piotrowski" <michal.k.k.piotrowski@gmail.com>]

On 14/08/06, Dave Jones <davej@redhat.com> wrote:
> On Mon, Aug 14, 2006 at 10:48:58PM +0200, Michal Piotrowski wrote:
>  >
>  > Hmmm... It looks a bit different without futex_handle_fault-always-fails.patch
>  >
>  > Aug 14 22:30:09 ltg01-fedora kernel: general protection fault: 0000 [#1]
>  > Aug 14 22:30:09 ltg01-fedora kernel: 4K_STACKS PREEMPT SMP
>  > Aug 14 22:30:09 ltg01-fedora kernel: last sysfs file: /devices/platform/i2c-9191/9191-0290/temp2_input
>  > Aug 14 22:30:09 ltg01-fedora kernel: Modules linked in: ipv6 w83627hf hwmon_vid hwmon i2c_isa 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 spe
>  > edstep_lib binfmt_misc thermal processor fan container evdev snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_seq_dummy snd_seq_
>  > oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm sk98lin skge snd_timer snd soundcore snd_pag
>  > e_alloc ide_cd i2c_i801 intel_agp agpgart cdrom rtc unix
>  > Aug 14 22:30:09 ltg01-fedora kernel: CPU:    0
>  > Aug 14 22:30:09 ltg01-fedora kernel: EIP:    0060:[<c0205249>]    Not tainted VLI
>  > Aug 14 22:30:09 ltg01-fedora kernel: EFLAGS: 00010246   (2.6.18-rc4-mm1 #101)
>  > Aug 14 22:30:09 ltg01-fedora kernel: EIP is at __list_add+0x3d/0x7a
>
>  ...
>
>  > 0xc0205249 is in __list_add (/usr/src/linux-mm/lib/list_debug.c:28).
>  > 23              if (unlikely(next->prev != prev)) {
>  > 24                      printk("list_add corruption. next->prev should be %p, but was %p\n",
>  > 25                              prev, next->prev);
>  > 26                      BUG();
>  > 27              }
>  > 28              if (unlikely(prev->next != next)) {
>  > 29                      printk("list_add corruption. prev->next should be %p, but was %p\n",
>  > 30                              next, prev->next);
>  > 31                      BUG();
>  > 32              }
>  >
>  > I'll revert debug-variants-of-linked-list-macros.patch
>
> __list_add will still be dereferencing prev->next, so you should see exactly
> the same gpf. Note that you're not triggering the BUG()'s here, you're hitting
> some other fault just walking the list.

How can I debug this?

>                 Dave
>
> --
> http://www.codemonkey.org.uk

Regards,
Michal

--
Michal K. K. Piotrowski
LTG - Linux Testers Group
(http://www.stardust.webpages.pl/ltg/wiki/)
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