oops in kmpathd

oops in kmpathd

[David Strand]

I am running kernel 2.6.29, and saw this kernel oops in kmpathd today.
Some ports to an FC switch we're activated, and new devices we're
being found when this occured. It seems to be difficult to duplicate;
any ideas?

Jun  2 17:47:13 cs02 kernel: BUG: unable to handle kernel NULL pointer
dereference at 000000b7
Jun  2 17:47:13 cs02 kernel: IP: [<f7345f74>] 0xf7345f74
Jun  2 17:47:13 cs02 kernel: *pde = 00000000
Jun  2 17:47:14 cs02 kernel: Oops: 0002 [#1] SMP
Jun  2 17:47:14 cs02 kernel: last sysfs file:
/sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0/host0/rport-0:0-5/target0:0:5/0:0:5:0/block/sdf/dev
Jun  2 17:47:14 cs02 kernel: Modules linked in: bonding
Jun  2 17:47:14 cs02 kernel:
Jun  2 17:47:14 cs02 kernel: Pid: 595, comm: kmpathd/0 Not tainted
(2.6.29 #2) Sossaman/Lindhrst Allagash Reference Board
Jun  2 17:47:14 cs02 kernel: EIP: 0060:[<f7345f74>] EFLAGS: 00010282 CPU: 0
Jun  2 17:47:14 cs02 kernel: EIP is at 0xf7345f74
Jun  2 17:47:14 cs02 kernel: EAX: f705eb80 EBX: f662d880 ECX: 00000000
EDX: 000000b7
Jun  2 17:47:14 cs02 kernel: ESI: f662df80 EDI: 00000282 EBP: f5a7e4f0
ESP: f7345f78
Jun  2 17:47:14 cs02 kernel: DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
Jun  2 17:47:14 cs02 kernel: Process kmpathd/0 (pid: 595, ti=f7344000
task=f705eb80 task.ti=f7344000)
Jun  2 17:47:14 cs02 kernel: Stack:
Jun  2 17:47:14 cs02 kernel: f69fd400 f69fd400 f5a7e4f4 c0137923
00000246 f7345fb4 00000001 f69fd410
Jun  2 17:47:14 cs02 kernel: c03422c0 f69fd410 f69fd418 f69fd400
f69fd400 f69fd410 c0137cc7 00000000
Jun  2 17:47:14 cs02 kernel: f705eb80 c013b3a0 f7345fc0 f7345fc0
c0137c80 f69fd400 00000000 00000000
Jun  2 17:47:14 cs02 kernel: Call Trace:
Jun  2 17:47:14 cs02 kernel: [<c0137923>] run_workqueue+0x73/0x120
Jun  2 17:47:14 cs02 kernel: [<c03422c0>] process_queued_ios+0x0/0x160
Jun  2 17:47:14 cs02 kernel: [<c0137cc7>] worker_thread+0x47/0x90
Jun  2 17:47:14 cs02 kernel: [<c013b3a0>] autoremove_wake_function+0x0/0x40
Jun  2 17:47:14 cs02 kernel: [<c0137c80>] worker_thread+0x0/0x90
Jun  2 17:47:14 cs02 kernel: [<c013b079>] kthread+0x39/0x70
Jun  2 17:47:14 cs02 kernel: [<c013b040>] kthread+0x0/0x70
Jun  2 17:47:14 cs02 kernel: [<c0103f0b>] kernel_thread_helper+0x7/0x1c
Jun  2 17:47:14 cs02 kernel: Code: 00 00 00 80 df 62 f6 82 02 00 00 f0
e4 a7 f5 80 eb 05 f7 7b 00 62 f6 7b 00 62 f6 d8 00 a7 f5 ff ff ff ff
74 5f 34 f7 60 00 00 00 <82> 02 01 00 00 d4 9f f6 00 d4 9f f6 f4 e4 a7
f5 23 79 13 c0 46
Jun  2 17:47:14 cs02 kernel: EIP: [<f7345f74>] 0xf7345f74 SS:ESP 0068:f7345f78
Jun  2 17:47:14 cs02 kernel: ---[ end trace 256818778cd84edd ]---

Re: oops in kmpathd

[Christof Schmitt]

On Wed, Jun 03, 2009 at 11:08:21AM -0700, David Strand wrote:
> I am running kernel 2.6.29, and saw this kernel oops in kmpathd today.
> Some ports to an FC switch we're activated, and new devices we're
> being found when this occured. It seems to be difficult to duplicate;
> any ideas?
> 
> Jun  2 17:47:13 cs02 kernel: BUG: unable to handle kernel NULL pointer
> dereference at 000000b7
> Jun  2 17:47:13 cs02 kernel: IP: [<f7345f74>] 0xf7345f74
> Jun  2 17:47:13 cs02 kernel: *pde = 00000000
> Jun  2 17:47:14 cs02 kernel: Oops: 0002 [#1] SMP
> Jun  2 17:47:14 cs02 kernel: last sysfs file:
> /sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0/host0/rport-0:0-5/target0:0:5/0:0:5:0/block/sdf/dev
> Jun  2 17:47:14 cs02 kernel: Modules linked in: bonding
> Jun  2 17:47:14 cs02 kernel:
> Jun  2 17:47:14 cs02 kernel: Pid: 595, comm: kmpathd/0 Not tainted
> (2.6.29 #2) Sossaman/Lindhrst Allagash Reference Board
> Jun  2 17:47:14 cs02 kernel: EIP: 0060:[<f7345f74>] EFLAGS: 00010282 CPU: 0
> Jun  2 17:47:14 cs02 kernel: EIP is at 0xf7345f74
> Jun  2 17:47:14 cs02 kernel: EAX: f705eb80 EBX: f662d880 ECX: 00000000
> EDX: 000000b7
> Jun  2 17:47:14 cs02 kernel: ESI: f662df80 EDI: 00000282 EBP: f5a7e4f0
> ESP: f7345f78
> Jun  2 17:47:14 cs02 kernel: DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> Jun  2 17:47:14 cs02 kernel: Process kmpathd/0 (pid: 595, ti=f7344000
> task=f705eb80 task.ti=f7344000)
> Jun  2 17:47:14 cs02 kernel: Stack:
> Jun  2 17:47:14 cs02 kernel: f69fd400 f69fd400 f5a7e4f4 c0137923
> 00000246 f7345fb4 00000001 f69fd410
> Jun  2 17:47:14 cs02 kernel: c03422c0 f69fd410 f69fd418 f69fd400
> f69fd400 f69fd410 c0137cc7 00000000
> Jun  2 17:47:14 cs02 kernel: f705eb80 c013b3a0 f7345fc0 f7345fc0
> c0137c80 f69fd400 00000000 00000000
> Jun  2 17:47:14 cs02 kernel: Call Trace:
> Jun  2 17:47:14 cs02 kernel: [<c0137923>] run_workqueue+0x73/0x120
> Jun  2 17:47:14 cs02 kernel: [<c03422c0>] process_queued_ios+0x0/0x160
> Jun  2 17:47:14 cs02 kernel: [<c0137cc7>] worker_thread+0x47/0x90
> Jun  2 17:47:14 cs02 kernel: [<c013b3a0>] autoremove_wake_function+0x0/0x40
> Jun  2 17:47:14 cs02 kernel: [<c0137c80>] worker_thread+0x0/0x90
> Jun  2 17:47:14 cs02 kernel: [<c013b079>] kthread+0x39/0x70
> Jun  2 17:47:14 cs02 kernel: [<c013b040>] kthread+0x0/0x70
> Jun  2 17:47:14 cs02 kernel: [<c0103f0b>] kernel_thread_helper+0x7/0x1c
> Jun  2 17:47:14 cs02 kernel: Code: 00 00 00 80 df 62 f6 82 02 00 00 f0
> e4 a7 f5 80 eb 05 f7 7b 00 62 f6 7b 00 62 f6 d8 00 a7 f5 ff ff ff ff
> 74 5f 34 f7 60 00 00 00 <82> 02 01 00 00 d4 9f f6 00 d4 9f f6 f4 e4 a7
> f5 23 79 13 c0 46
> Jun  2 17:47:14 cs02 kernel: EIP: [<f7345f74>] 0xf7345f74 SS:ESP 0068:f7345f78
> Jun  2 17:47:14 cs02 kernel: ---[ end trace 256818778cd84edd ]---

This patch might be related:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=17d5c8ca7572124c9623045f24b0c21d4aa2b47f

It is not in 2.6.29, only in 2.6.30. Could you apply this patch and
see if you still hit the same problem?

--
Christof Schmitt