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Date: Thu, 28 Feb 2008 14:13:23 +0100
From: Cedric Le Goater <clg@fr.ibm.com>
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To: Rik van Riel <riel@redhat.com>
CC: Oleg Nesterov <oleg@tv-sign.ru>,
       Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
       Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
       roland@redhat.com, Andy Whitcroft <apw@shadowen.org>,
       Balbir Singh <balbir@linux.vnet.ibm.com>
Subject: Re: [BUG] 2.6.25-rc2-mm1 - Kernel panic while bootup caused by signal_group_exit()
References: <20080216002522.9c4bd0fb.akpm@linux-foundation.org>	<47B7B3B9.2090706@linux.vnet.ibm.com>	<20080220143417.6e419c5e@cuia.boston.redhat.com>	<20080220200440.GA105@tv-sign.ru> <20080220175309.6ce3cb31@cuia.boston.redhat.com>
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Hello !

Rik van Riel wrote:
> On Wed, 20 Feb 2008 23:04:40 +0300
> Oleg Nesterov <oleg@tv-sign.ru> wrote:
> 
>> Yes, please look at http://marc.info/?t=120309840500006
>>
>> Btw. The bug in tty_io.c _can_ explain this trace, but it would be nice
>> to ensure we don't have other problems. Could you try this
>>
>> 	http://marc.info/?l=linux-kernel&m=120352655031911
>>
>> patch?
> 
> Fun.  With that debugging patch applied, the oops on boot no longer
> happens...
> 
> No, I have no idea why...

It also fixed a oops at boot time for me. Here's a warning I got with oleg patch.

Thanks,

C.

WARNING: at /home/legoater/linux/2.6.25-rc2-mm1/kernel/pid.c:213 put_pid+0x4b/0x82()
Modules linked in: tg3 sg joydev ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Pid: 1, comm: init Not tainted 2.6.25-rc2-mm1 #6

Call Trace:
 [<ffffffff8022f0a1>] warn_on_slowpath+0x58/0x85
 [<ffffffff8024b87d>] ? trace_hardirqs_on+0xd/0xf
 [<ffffffff8024b84c>] ? trace_hardirqs_on_caller+0xf2/0x116
 [<ffffffff8024b87d>] ? trace_hardirqs_on+0xd/0xf
 [<ffffffff8024b84c>] ? trace_hardirqs_on_caller+0xf2/0x116
 [<ffffffff8023fb0f>] put_pid+0x4b/0x82
 [<ffffffff802ccd6e>] ? proc_delete_inode+0x0/0x4f
 [<ffffffff802ccd90>] proc_delete_inode+0x22/0x4f
 [<ffffffff802ccd6e>] ? proc_delete_inode+0x0/0x4f
 [<ffffffff802a0826>] generic_delete_inode+0xb8/0x138
 [<ffffffff8029fd5d>] iput+0x7c/0x80
 [<ffffffff8029d835>] dentry_iput+0xa3/0xbb
 [<ffffffff8029d8ea>] d_kill+0x21/0x42
 [<ffffffff8029ebee>] dput+0x114/0x125
 [<ffffffff802cefe0>] proc_flush_task+0x125/0x28f
 [<ffffffff8024b87d>] ? trace_hardirqs_on+0xd/0xf
 [<ffffffff802312a5>] release_task+0x24/0x331
 [<ffffffff80231ca1>] do_wait+0x6ef/0xa99
 [<ffffffff80227b43>] ? default_wake_function+0x0/0xf
 [<ffffffff802320dc>] sys_wait4+0x91/0xab
 [<ffffffff8020b21b>] system_call_after_swapgs+0x7b/0x80

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