linux-kernel - [BUG] mm snapshot broken-out-2007-11-06-02-32

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Date:	Tue, 06 Nov 2007 22:57:55 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	akpm@...ux-foundation.org
CC:	mm-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andy Whitcroft <apw@...dowen.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: [BUG] mm snapshot broken-out-2007-11-06-02-32 - kernel oops

Hi Andrew,

Kernel bug, followed by soft lockup is hit, while booting in to 2.6.24-rc1 mm1
broken-out

BUG: unable to handle kernel NULL pointer dereference at virtual address 00000004
printing eip: c10675eb *pdpt = 000000000290c001 *pde = 0000000000000000 
Oops: 0002 [#1] SMP 
last sysfs file: 
Modules linked in:

Pid: 1164, comm: mount Not tainted (2.6.24-rc1-mm1-autokern1 #1)
EIP: 0060:[<c10675eb>] EFLAGS: 00010202 CPU: 9
EIP is at d_kill+0xd/0x41
EAX: 00000000 EBX: c1c32088 ECX: c1c320b8 EDX: c1067509
ESI: c1c320b0 EDI: c1c32088 EBP: c22a5a00 ESP: c22b1ed0
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process mount (pid: 1164, ti=c22b0000 task=c29fa000 task.ti=c22b0000)
Stack: c1c32088 c1c320b0 c1067949 c1c320b0 c1067ba9 c22b1f34 c22a5a00 c2923000 
       c22a5a00 c105b839 00000001 c22b1f34 00000001 00000001 c106c4aa 00000000 
       00000080 c2870000 00000001 00000080 c22b1f34 c106cdb1 c2923000 00000000 
Call Trace:
 [<c1067949>] prune_one_dentry+0x30/0xa6
 [<c1067ba9>] shrink_dcache_sb+0xa8/0xd1
 [<c105b839>] do_remount_sb+0x2c/0xa4
 [<c106c4aa>] do_remount+0x77/0xae
 [<c106cdb1>] do_mount+0x131/0x1a5
 [<c103c517>] __alloc_pages+0x45/0x2be
 [<c106d077>] sys_mount+0x6f/0xad
 [<c100221e>] syscall_call+0x7/0xb
 [<c1200000>] unix_gid_parse+0x213/0x297
 =======================
Code: f2 89 d8 ff d1 eb 14 5b 89 f0 5e e9 1c 29 00 00 c6 40 08 01 c6 05 80 fe 32 c1 01 5b 5e c3 56 8d 48 30 53 8b 51 04 89 c3 8b 40 30 <89> 50 04 89 02 89 d8 c7 43 30 00 01 10 00 c7 41 04 00 02 20 00 
EIP: [<c10675eb>] d_kill+0xd/0x41 SS:ESP 0068:c22b1ed0
BUG: soft lockup - CPU#9 stuck for 11s! [mount:1164]

Pid: 1164, comm: mount Tainted: G      D (2.6.24-rc1-mm1-autokern1 #1)
EIP: 0060:[<c1206684>] EFLAGS: 00000286 CPU: 9
EIP is at _spin_lock+0x5/0xf
EAX: c132fe80 EBX: c1c25e58 ECX: 00000000 EDX: 00000000
ESI: c132fe80 EDI: c1c20404 EBP: c1c25e58 ESP: c22b1dd4
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
CR0: 8005003b CR2: 00000004 CR3: 01370000 CR4: 000006f0
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff0ff0 DR7: 00000400
 [<c10fe3be>] _atomic_dec_and_lock+0x2a/0x58
 [<c1067687>] dput+0x68/0x114
 [<c105ad44>] __fput+0x1b3/0x1d6
 [<c1047a99>] remove_vma+0x25/0x42
 [<c104952e>] exit_mmap+0xb6/0xcc
 [<c10176c1>] mmput+0x36/0xa1
 [<c101bc51>] do_exit+0x1db/0x28c
 [<c10032e7>] die+0x1ac/0x1b1
 [<c100f68a>] do_page_fault+0x5d1/0x6c3
 [<c100f0b9>] do_page_fault+0x0/0x6c3
 [<c120683a>] error_code+0x72/0x78
 [<c1067509>] d_callback+0x0/0x5
 [<c10f007b>] md4_transform+0x4a7/0x520
 [<c10600d8>] __link_path_walk+0x1a1/0x99f
 [<c10675eb>] d_kill+0xd/0x41
 [<c1067949>] prune_one_dentry+0x30/0xa6
 [<c1067ba9>] shrink_dcache_sb+0xa8/0xd1
 [<c105b839>] do_remount_sb+0x2c/0xa4
 [<c106c4aa>] do_remount+0x77/0xae
 [<c106cdb1>] do_mount+0x131/0x1a5
 [<c103c517>] __alloc_pages+0x45/0x2be
 [<c106d077>] sys_mount+0x6f/0xad
 [<c100221e>] syscall_call+0x7/0xb
 [<c1200000>] unix_gid_parse+0x213/0x297
 =======================
-- 
Thanks & Regards,
Kamalesh Babulal,
Linux Technology Center,
IBM, ISTL.

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