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Date: Sun, 17 Feb 2008 15:41:48 +0300
From: Oleg Nesterov <oleg@tv-sign.ru>
To: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Cc: 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()
Message-ID: <20080217124148.GA9802@tv-sign.ru>
References: <20080216002522.9c4bd0fb.akpm@linux-foundation.org> <47B7B3B9.2090706@linux.vnet.ibm.com>
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On 02/17, Kamalesh Babulal wrote:
> 
> There has been discussion on the patch for this panic on http://lkml.org/lkml/2008/2/16/99 

This looks similar...

> [   25.512919] BUG: unable to handle kernel paging request at 9d74e37b
> [   25.514926] IP: [<c04a8fac>] proc_flush_task+0x5b/0x223
> [   25.516934] Oops: 0000 [#1] SMP 
> [   25.517918] last sysfs file: /sys/block/hdc/removable
> [   25.517918] Modules linked in: dm_mirror dm_mod video output sbs sbshc battery ac parport_pc lp parport floppy sg serio_raw ide_cd_mod cdrom scb2_flash mtd chipreg button i2c_piix4 i2c_core pcspkr tg3 mptspi mptscsih mptbase scsi_transport_spi sd_mod scsi_mod ext3 jbd ehci_hcd ohci_hcd uhci_hcd
> [   25.517918] 
> [   25.517918] Pid: 1, comm: init Not tainted (2.6.25-rc2-mm1-autotest #1)
> [   25.517918] EIP: 0060:[<c04a8fac>] EFLAGS: 00010282 CPU: 2
> [   25.517918] EIP is at proc_flush_task+0x5b/0x223
> [   25.517918] EAX: 9d74e35b EBX: f7881ef0 ECX: f7a5ed84 EDX: a56b6b6b
> [   25.517918] ESI: f74f76f8 EDI: a56b6b6b EBP: f7881f08 ESP: f7881ec0
> [   25.517918]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> [   25.517918] Process init (pid: 1, ti=f7881000 task=f788adf0 task.ti=f7881000)
> [   25.517918] Stack: f7a5ed84 00000001 f7a5ed58 f7a5ed58 00000000 a56b6b6b f7852750 f7a5ed68 
> [   25.517918]        35881ef4 00003130 f788b4a4 f788adf0 0012d6c5 00000003 f7881ee3 00000003 
> [   25.517918]        f7a72df0 f7a72df0 f7881f1c c042676d 00000003 000001f5 f7a72df0 f7881f78 
> [   25.517918] Call Trace:
> [   25.517918]  [<c042676d>] release_task+0x19/0x2d5
> [   25.517918]  [<c042701b>] do_wait+0x5f2/0x8fc
> [   25.517918]  [<c041d9e7>] default_wake_function+0x0/0xd
> [   25.517918]  [<c042739d>] sys_wait4+0x78/0x8e
> [   25.517918]  [<c04273c6>] sys_waitpid+0x13/0x15
> [   25.517918]  [<c04039ba>] sysenter_past_esp+0x5f/0x99
> [   25.517918]  =======================
> [   25.517918] Code: 1c 89 4d d4 89 4d c4 89 55 b8 e9 b5 01 00 00 31 ff 83 7d c4 00 74 06 8b 45 d4 8b 78 1c 8b 55 b8 8b 4d b8 8b 12 89 55 cc 8b 41 04 <8b> 40 20 52 68 33 cd 6f c0 6a 0d 89 45 d0 8d 45 db 50 89 45 f0 

Kamalesh, could you send me the output of "objdump -d fs/proc/base.o" ?
and just in case, fs/proc/base.s (make fs/proc/base.s).

Oleg.

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