linux-kernel - Re: mm snapshot broken-out-2007-04-07-03-27.tar.gz uploaded

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Date:	Sat, 7 Apr 2007 20:48:43 +0200
From:	"Michal Piotrowski" <michal.k.k.piotrowski@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"Roland McGrath" <roland@...hat.com>
Subject: Re: mm snapshot broken-out-2007-04-07-03-27.tar.gz uploaded

On 07/04/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Sat, 07 Apr 2007 20:09:43 +0200 Michal Piotrowski <michal.k.k.piotrowski@...il.com> wrote:
>
> > BTW. I guess that this need a similar fix.
> >
> > kernel BUG at kernel/ptrace.c:494!
> > invalid opcode: 0000 [#2]
> > PREEMPT SMP
> > last sysfs file: devices/platform/w83627hf.656/temp2_input
> > Modules linked in: ipt_MASQUERADE iptable_nat nf_nat nfsd exportfs lockd nfs_acl autofs4 sunrpc af_packet nf_conntrack_netbios_ns ipt_REJECT nf_conntrack_ipv4 xt_state nf_conntrack nfnetlink iptable_filter ip_tables ip6t_REJECT xt_tcpudp ip6table_filter ip6_tables x_tables ipv6 binfmt_misc thermal processor fan container nvram snd_intel8x0 snd_ac97_codec ac97_bus snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss intel_agp snd_pcm agpgart evdev snd_timer snd soundcore i2c_i801 snd_page_alloc ide_cd cdrom rtc unix
> > CPU:    1
> > EIP:    0060:[<c0163f22>]    Not tainted VLI
> > EFLAGS: 00010202   (2.6.21-rc6-mm1 #1)
> > EIP is at ptrace_exit+0x29/0x21d
> >
>
> no, I don't see what would cause that.  Was there no call trace?

Here is a call trace (it was in the first email).

Call Trace:
 [<c012820e>] do_exit+0x16b/0x86c
 [<c0105a77>] die+0x206/0x22c
 [<c0105b27>] do_trap+0x8a/0xa4
 [<c0105e93>] do_invalid_op+0x88/0x92
 [<c0351e89>] error_code+0x79/0x80
 [<c0163566>] ptrace_do_wait+0x1eb/0x510
 [<c0127e10>] do_wait+0x9d6/0xbad
 [<c0128017>] sys_wait4+0x30/0x32
 [<c0128040>] sys_waitpid+0x27/0x29
 [<c010424c>] syscall_call+0x7/0xb
 [<b7f36410>] 0xb7f36410

>
> It's always possible that some random part of the kernel has
> gone and leaked a preempt_count.
>
> BUG_ON is an obnoxious thing - please prefer to use WARN_ON in non-fatal
> situations.   Particularly when the assertions aren't tested ;)
>

Regards,
Michal

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