[Drbd-dev] Panic in _drbd_send_page() again.

[Montrose, Ernest]

Hi all,
I think we have seen this panic before.  I am not sure if there was a
fix then a regression of sort.
I am looking for a clue to help narrow this down. It seems a
bvec->bv_page is freed and is being used later.  Here is the panic
message:
 
Apr 21 05:05:53 chogs kernel: CPU:    0
Apr 21 05:05:53 chogs kernel: EIP:    0061:[<ee2853c1>]    Tainted: GF
VLI
Apr 21 05:05:53 chogs kernel: EFLAGS: 00010296  (2.6.16.38-xen #1)
Apr 21 05:05:53 chogs kernel: EIP is at _drbd_send_page+0x21/0x120
[drbd]
Apr 21 05:05:53 chogs kernel: eax: ffffffff  ebx: c05958fc  ecx:
eb024000  edx: 6b6b6b6b
Apr 21 05:05:53 chogs kernel: esi: 6b6b6b6b  edi: a56b6b6b  ebp:
eb025eec  esp: eb025ebc
Apr 21 05:05:53 chogs kernel: ds: 007b  es: 007b  ss: 0069
Apr 21 05:05:53 chogs kernel: Process drbd3_worker (pid: 5739,
threadinfo=eb024000 task=ed440570)
Apr 21 05:05:53 chogs kernel: Stack: <0>00001000 00004000 00000000
eb024000 00000020 ec64b26c ffffffff 6b6b6b6b
Apr 21 05:05:53 chogs kernel:        ec64b26c c05958fc 00000003 c7a5c6d0
eb025f08 ee2854f3 6b6b6b6b ec64b26c
Apr 21 05:05:54 chogs kernel:        eb025f30 00000000 ec64b26c eb025f5c
ee285643 00000020 00008000 00000000
Apr 21 05:05:54 chogs kernel: Call Trace:
Apr 21 05:05:54 chogs kernel:  [<c0105a01>] show_stack_log_lvl+0xa1/0xe0
Apr 21 05:05:54 chogs kernel:  [<c0105bf1>] show_registers+0x181/0x200
Apr 21 05:05:54 chogs kernel:  [<c0105e10>] die+0x100/0x1b0
Apr 21 05:05:54 chogs kernel:  [<c01168f6>] do_page_fault+0x3c6/0x8c1
Apr 21 05:05:54 chogs kernel:  [<c010565f>] error_code+0x2b/0x30
Apr 21 05:05:54 chogs kernel:  [<ee2854f3>] _drbd_send_zc_bio+0x33/0x50
[drbd]
Apr 21 05:05:55 chogs kernel:  [<ee285643>] drbd_send_dblock+0x133/0x1f0
[drbd]
Apr 21 05:05:55 chogs kernel:  [<ee2703da>] w_send_dblock+0x1a/0xe0
[drbd]
Apr 21 05:05:55 chogs kernel:  [<ee270e5e>] drbd_worker+0x2de/0x4b5
[drbd]
Apr 21 05:05:55 chogs kernel:  [<ee283f8c>] drbd_thread_setup+0x8c/0x100
[drbd]
Apr 21 05:05:55 chogs kernel:  [<c0103485>]
kernel_thread_helper+0x5/0x10
Apr 21 05:05:55 chogs kernel: Code: 5d f4 8b 7d fc 89 ec 5d c3 90 55 89
e5 57 89 cf b9 00 e0 ff ff 56 53 83 ec 24 8b 75 08 89 45 f0 89 55 ec 21
e1 8b 41 18 89 45 e8 <8b> 02 f6 c4 40 74 03 8b 52 0c 8b 42 04 40 85 c0
7e 09 8b 55 ec
Apr 21 05:05:55 chogs kernel:  <0>Fatal exception: panic in 5 seconds
 
Thanks,
 
EM--
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