[Ocfs2-devel] 2.6.32.6: OCFS2: NULL pointer dereference

[Alexander Beregalov]

Hi

Host is x86_32 SMP.
Trying to mount AoE exported block device:

(mkfs.ocfs2 -N 30 -T mail /dev/..)

OCFS2 Node Manager 1.5.0
OCFS2 DLM 1.5.0
ocfs2: Registered cluster interface o2cb
OCFS2 DLMFS 1.5.0
OCFS2 User DLM kernel interface loaded
OCFS2 1.5.0
ocfs2_dlm: Nodes in domain (C987785CC2BE4476BBD74BB02A853654): 22
JBD: Ignoring recovery information on journal
ocfs2: Mounting device (152,5632) on (node 22, slot 1) with ordered data mode.
(10881,0):ocfs2_replay_journal:1607 Recovering node 7 from slot 0 on
device (152,5632)
BUG: unable to handle kernel NULL pointer dereference at 0000001f
IP: [<f8f4a168>] ocfs2_update_disk_slot_old+0x11/0x4c [ocfs2]
*pde = 00000000
Oops: 0000 [#1] SMP
last sysfs file: /sys/fs/o2cb/interface_revision
Modules linked in: ocfs2 jbd2 quota_tree ocfs2_dlmfs ocfs2_stack_o2cb
ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue configfs aoe dm_mirror
dm_region_hash dm_log dm_multipath ohci_hcd usbcore nls_base tg3
libphy [last unloaded: microcode]
Pid: 10881, comm: ocfs2rec Not tainted (2.6.32.6 #1) eserver xSeries
335 -[8676L1X]-
EIP: 0060:[<f8f4a168>] EFLAGS: 00010297 CPU: 0
EIP is at ocfs2_update_disk_slot_old+0x11/0x4c [ocfs2]
EAX: 00000007 EBX: f5be1800 ECX: f6896fd8 EDX: 00000000
ESI: f5be1800 EDI: f6a95f08 EBP: 00000000 ESP: f6a95edc
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
Process ocfs2rec (pid: 10881, ti=f6a94000 task=f5bf06e0 task.ti=f6a94000)
Stack:
 f65bc800 f5be1800 00000000 f8f4a200 e4b5c0c0 f6a95f3c f5ec4b08 f279c800
<0> 00000007 f5f89080 f5ec4008 f8f4a56a 00000000 00000007 f65bc800 f8f2b3e2
<0> f65bc9c4 00000000 f8f124c4 00000000 00000000 00000000 00000001 00000016
Call Trace:
 [<f8f4a200>] ? ocfs2_update_disk_slot+0x5d/0x109 [ocfs2]
 [<f8f4a56a>] ? ocfs2_clear_slot+0x22/0x3d [ocfs2]
 [<f8f2b3e2>] ? ocfs2_recover_node+0x91/0x49e [ocfs2]
 [<f8f124c4>] ? ocfs2_super_lock+0x9f/0x481 [ocfs2]
 [<f8f29e94>] ? __ocfs2_recovery_thread+0x181/0x87e [ocfs2]
 [<c124ea51>] ? schedule+0x1b1/0x4b1
 [<c1022a9f>] ? __wake_up_common+0x3a/0x66
 [<f8f29d13>] ? __ocfs2_recovery_thread+0x0/0x87e [ocfs2]
 [<c1022bf6>] ? complete+0x37/0x46
 [<f8f29d13>] ? __ocfs2_recovery_thread+0x0/0x87e [ocfs2]
 [<c10377c8>] ? kthread+0x68/0x6d
 [<c1037760>] ? kthread+0x0/0x6d
 [<c100369f>] ? kernel_thread_helper+0x7/0x18
Code: 04 89 44 fe 04 8b 43 10 8b 04 88 89 45 00 83 c4 04 5b 5e 5f 5d
c3 0f 0b eb fe 57 31 d2 89 cf 56 53 89 c3 8b 48 10 3b 53 14 8b 01 <8b>
70 18 3e 72 12 eb 2b 8b 44 d0 04 66 89 04 56 83 c2 01 3b 53
EIP: [<f8f4a168>] ocfs2_update_disk_slot_old+0x11/0x4c [ocfs2] SS:ESP
0068:f6a95edc
CR2: 000000000000001f