[Ocfs2-users] Kernel oops: ocfs2_read_blocks

[Stefan Upietz]

Hello there,

we're experiencing strange behaviour with our ocfs2-enabled systems
after one node goes down. Right now it is not possible to recreate
this situation, for it is (alas!) on a critical system...
This happened on a HP ProLiant DL 360 with an ocfs2 volume on a SAN.
We're running Debian Squeeze with o2cb_ctl version 1.4.4.
This is my first post on an oops, so if I missed any information I'd be
glad if you gave me some hints. Here's the trace:

Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.225294] BUG: 
unable to handle kernel NULL pointer dereference at 00000002
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.225346] IP: 
[<fb4fdf60>] ocfs2_read_blocks+0x2e2/0x5ba [ocfs2]
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.225393] *pdpt = 
0000000001 446001 *pde = 0000000000000000
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.225426] Oops: 0000 
[#1] SMP
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.225453] last sysfs 
file: 
/sys/devices/pci0000:00/0000:00:07.0/0000:0d:00.0/host3/rport-3:0-7/target3:0:0/3:0:0:10/state
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.225506] Modules 
linked in:
  ipt_REJECT xt_tcpudp iptable_filter ip_tables ocfs2 quota_tree 
ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue 
configfs arpt_mangle arptable_filter arp_tables x_tables bonding 
dm_round_robin dm_multipath scsi_dh loop radeon ttm snd_pcm 
drm_kms_helper snd_timer snd drm soundcore i2c_algo_bit ipmi_si ses 
i2c_core ipmi_msghandler snd_page_alloc sd_mod psmouse hpwdt pcspkr 
enclosure hpilo crc_t10dif serio_raw processor container power_meter 
button evdev ext4 mbcache jbd2 crc16 dm_mod sg usbhid sr_mod hid cdrom 
ata_generic cciss uhci _hcd thermal qla2xxx scsi_transport_fc ata_piix 
scsi_tgt ehci_hcd libata usbcore nls_base thermal_sys bnx2 scsi_mod 
[last unloaded: scsi_wait_scan]
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.225952]
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.225974] Pid: 
32337, comm: ocfs2rec Not tainted (2.6.32-5-686-bigmem #1) ProLiant DL380 G6
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226022] EIP: 
0060:[<fb4fdf60>] EFLAGS: 00010202 CPU: 10
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226059] EIP is at 
ocfs2_read_blocks+0x2e2/0x5ba [ocfs2]
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226087] EAX: 
f5647d48 EBX: f3ec31dc ECX: ffffffff EDX: 00000001
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226116] ESI: 
00000002 EDI: 00000000 EBP: 00000001 ESP: f40f1e6c
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226145]  DS: 007b 
ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226174] Process 
ocfs2rec (pid: 32337, ti=f40f0000 task=f658aec0 task.ti=f40f0000)
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226219] Stack:
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226240]  00000001 
00000000 ffffffff ffffffff f5dc8dd8 f5673000 00000001 f3ec31dc
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226286] <0> 
f6b34d20 00000000 f3ec3000 fb53937f 00000001 f5647d48 00000001 00000000
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226350] <0> 
f3ec31dc 00000001 f3ec3000 00000000 fb50eeab f383be64 f3ec3000 00000000
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226431] Call Trace:
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226467] 
[<fb53937f>] ? ocfs2_refresh_slot_info+0x80/0xad [ocfs2]
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226508] 
[<fb50eeab>] ? ocfs2_super_lock+0x1b4/0x27c [ocfs2]
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226548] 
[<fb51e18f>] ? __ocfs2_recovery_thread+0xc4/0x146d [ocfs2]
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226581] 
[<c1006f50>] ? __switch_to+0xcf/0x141
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226610] 
[<c1031658>] ? finish_task_switch+0x34/0x95
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226642] 
[<c127e933>] ? schedule+0x7a4/0x7f1
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226670] 
[<c1026881>] ? __wake_up_common+0x34/0x59
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226708] 
[<fb51e0cb>] ? __ocfs2_recovery_thread+0x0/0x146d [ocfs2]
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226741] 
[<c104a34c>] ? kthread+0x61/0x66
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226767] 
[<c104a2eb>] ? kthread+0x0/0x66
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226795] 
[<c1008d87>] ? kernel_thread_helper+0x7/0x10
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.226822] Code: 01 
00 00 68 bd 0e 56 fb e8 d9 00 d8 c5 c7 44 24 3c 01 00 00 00 83 c4 24 eb 
11 8b 14 24 89 54 24 18 eb 08 c7 44 24 18 01 00 00 00 <8b> 06 a9 00 00 
01 00 74 50 83 7c 24 18 00 0f 84 5b 01 00 00 f6
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.227056] EIP: 
[<fb4fdf60>] ocfs2_read_blocks+0x2e2/0x5ba [ocfs2] SS:ESP 0068:f40f1e6c
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.227117] CR2: 
0000000000000002
Jun 23 02:27:45 s_local at dante/dante kernel: : [638743.227387] ---[ end 
trace c5a96dd4578cc061 ]---