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Message-ID: <469E305D.8060003@redhat.com> Date: Wed, 18 Jul 2007 11:23:09 -0400 From: Chuck Ebbert <cebbert@...hat.com> To: Patrick McHardy <kaber@...sh.net> CC: Alasdair G Kergon <agk@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, dm-devel@...hat.com, linux-kernel@...r.kernel.org, "Jun'ichi Nomura" <j-nomura@...jp.nec.com> Subject: Re: [2.6.23 PATCH 07/18] dm io: fix panic on large request On 07/17/2007 09:16 AM, Patrick McHardy wrote: > Alasdair G Kergon wrote: >> From: "Jun'ichi Nomura" <j-nomura@...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@...jp.nec.com> >> Signed-off-by: Alasdair G Kergon <agk@...hat.com> >> >> --- >> drivers/md/dm-io.c | 5 ++++- >> 1 files changed, 4 insertions(+), 1 deletion(-) > > > This patch reproducibly oopses my box: > > [ 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 mempool_free() was called with a NULL pool. That can't be good. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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