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SubjectRe: [2.6.23 PATCH 07/18] dm io: fix panic on large request
Hi,

Patrick McHardy wrote:
> Alasdair G Kergon wrote:
>> From: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
>>
>> bio_alloc_bioset() will return NULL if 'num_vecs' is too large.
>> Use bio_get_nr_vecs() to get estimation of maximum number.
>>
>> Signed-off-by: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
>> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
>>
>> ---
>> drivers/md/dm-io.c | 5 ++++-
>> 1 files changed, 4 insertions(+), 1 deletion(-)
>
>
> This patch reproducibly oopses my box:

Thanks for the report.
But I'm not sure how the patch is related to the oops.

The stack trace shows the oops occurred in dm-crypt,
which doesn't use the part of the code modified by the patch
(dm-io).

Are you using other dm modules such as dm-multipath, dm-mirror
or dm-snapshot?
If so, can you take the output of 'dmsetup table' and 'dmsetup ls'?

Do you have a reliable way to reproduce the oops which I can try?

>
> [ 126.754204] BUG: unable to handle kernel NULL pointer dereference at
> virtual address 00000000
> [ 126.754326] printing eip:
> [ 126.754369] c0141a67
> [ 126.754420] *pde = 00000000
> [ 126.754465] Oops: 0000 [#1]
> [ 126.754507] PREEMPT
> [ 126.754585] Modules linked in: [...]
>
>
> [ 126.758372] CPU: 0
> [ 126.758373] EIP: 0060:[<c0141a67>] Not tainted VLI
> [ 126.758374] EFLAGS: 00010282 (2.6.22 #1)
> [ 126.758511] EIP is at mempool_free+0xe/0xc0
> [ 126.758558] eax: d39e65d0 ebx: 00000000 ecx: df2b9898 edx: 00000000
> [ 126.758605] esi: 00000000 edi: d39e65d0 ebp: d487d6d0 esp: df79fec0
> [ 126.758652] ds: 007b es: 007b fs: 0000 gs: 0000 ss: 0068
> [ 126.758699] Process kcryptd/0 (pid: 3218, ti=df79f000 task=df2b9640
> task.ti=df79f000)
> [ 126.758747] Stack: 00000000 00000000 d3835f80 00000000 e08b0923
> e08a5f69 00000200 e0ad1080
> [ 126.759093] dfb5ab40 d3835f80 e08b08c0 00000000 e08a5fb7
> c01804d8 00000000 00000200
> [ 126.759439] c520bc00 00000c00 d0b77438 d5754b00 df79ff5c
> e08a515e d0b77444 d5754b00
> [ 126.759858] Call Trace:
> [ 126.759965] [<e08b0923>] clone_endio+0x63/0xc0 [dm_mod]
> [ 126.760066] [<e08a5f69>] crypt_convert+0x131/0x17f [dm_crypt]
> [ 126.760168] [<e08b08c0>] clone_endio+0x0/0xc0 [dm_mod]
> [ 126.760264] [<e08a5fb7>] kcryptd_do_work+0x0/0x30f [dm_crypt]
> [ 126.760349] [<c01804d8>] bio_endio+0x33/0x5d
> [ 126.760462] [<e08a515e>] dec_pending+0x28/0x39 [dm_crypt]
> [ 126.760558] [<e08a61e6>] kcryptd_do_work+0x22f/0x30f [dm_crypt]
> [ 126.760669] [<c0112182>] update_stats_wait_end+0x7f/0xb2
> [ 126.760801] [<e08a5fb7>] kcryptd_do_work+0x0/0x30f [dm_crypt]
> [ 126.760888] [<c012700e>] run_workqueue+0x84/0x179
> [ 126.760990] [<c0127292>] worker_thread+0x0/0xf0
> [ 126.761074] [<c012732f>] worker_thread+0x9d/0xf0
> [ 126.761160] [<c012a360>] autoremove_wake_function+0x0/0x37
> [ 126.761256] [<c0127292>] worker_thread+0x0/0xf0
> [ 126.761334] [<c012a15c>] kthread+0x52/0x58
> [ 126.761411] [<c012a10a>] kthread+0x0/0x58
> [ 126.761496] [<c0104983>] kernel_thread_helper+0x7/0x14
> [ 126.761598] =======================
> [ 126.761717] Code: 1c 00 89 f6 eb a9 b8 88 13 00 00 e8 b4 56 1c 00 8d
> 74 26 00 eb d5 31 db e9 11 ff ff ff 57 56 53 83 ec 04 89 c7 89 d6 85 c0
> 74 55 <8b> 02 39 42 04 7d 46 9c 58 90 8d b4 26 00 00 00 00 89 c3 fa 90
> [ 126.763964] EIP: [<c0141a67>] mempool_free+0xe/0xc0 SS:ESP 0068:df79fec0
>

Thanks,
--
Jun'ichi Nomura, NEC Corporation of America
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