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Date: Tue, 29 Nov 2011 13:00:48 +0100
From: Heiko Carstens <heiko.carstens@...ibm.com>
To: Mike Snitzer <snitzer@...hat.com>
Cc: Hannes Reinecke <hare@...e.de>,
"Jun'ichi Nomura" <j-nomura@...jp.nec.com>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Steffen Maier <maier@...ux.vnet.ibm.com>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
Jens Axboe <axboe@...nel.dk>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Alan Stern <stern@...land.harvard.edu>,
Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>,
"Taraka R. Bodireddy" <tarak.reddy@...ibm.com>,
"Seshagiri N. Ippili" <seshagiri.ippili@...ibm.com>,
"Manvanthara B. Puttashankar" <mputtash@...ibm.com>,
Jeff Moyer <jmoyer@...hat.com>,
Shaohua Li <shaohua.li@...el.com>, gmuelas@...ibm.com
Subject: Re: [GIT PULL] Queue free fix (was Re: [PATCH] block: Free queue
resources at blk_release_queue())
> > > Hmm. Just to be on the safe side, could you try this one:
> > >
> > > diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
> > > index 5e0090e..e6fad46 100644
> > > --- a/drivers/md/dm-mpath.c
> > > +++ b/drivers/md/dm-mpath.c
> > > @@ -920,8 +920,10 @@ static int multipath_map(struct dm_target *ti,
> > > struct reque
> > > st *clone,
> > > map_context->ptr = mpio;
> > > clone->cmd_flags |= REQ_FAILFAST_TRANSPORT;
> > > r = map_io(m, clone, mpio, 0);
> > > - if (r < 0 || r == DM_MAPIO_REQUEUE)
> > > + if (r < 0 || r == DM_MAPIO_REQUEUE) {
> > > mempool_free(mpio, m->mpio_pool);
> > > + map_context->ptr = NULL;
> > > + }
> > >
> > > return r;
> > > }
> >
> > With your patch we haven't been able to reproduce the kernel crash until now.
> > Now we "only" run into I/O stalls, which before your patch we also did. But
> > repeatedly rebooting and retrying and ignoring the I/O stalls always lead to
> > a crash.
> > Gonzalo will run a couple of extra rounds so we can have a feeling if at least
> > one of the bugs could be fixed with your patch ;)
>
> Hi,
>
> Any update after further testing with Hannes' patch?
Sorry for the late update, our internal IBM IMAP servers have been down
for nearly a week :/
So, we were unable to reproduce the original bug with the patch applied
during various runs.
However, we ran into this one instead, which is yet another use-after-free bug
(I need to double check, but I'm quite sure that a freed struct scsi_cmnd
caused this).
[ 4906.683654] Unable to handle kernel pointer dereference at virtual kernel address 6b6b6b6b6b6b6000
[ 4906.683662] Oops: 0038 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 4906.683672] Modules linked in: dm_round_robin sunrpc ipv6 qeth_l2 binfmt_misc dm_multipath scsi_dh dm_mod qeth ccwgroup [last unloaded: scsi_wait_scan]
[ 4906.683696] CPU: 3 Not tainted 3.1.0-52.x.20111111-s390xdefault #1
[ 4906.683700] Process flush-252:12 (pid: 2489, task: 0000000072b4a490, ksp: 0000000072f8fb48)
[ 4906.683705] Krnl PSW : 0404200180000000 000000000052a98c (zfcp_fsf_fcp_handler_common+0x3c/0x2f4)
[ 4906.683719] R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:0 CC:2 PM:0 EA:3
[ 4906.683728] Krnl GPRS: 0000000000000000 00000000726dc800 0000000037e1c4e8 0400043100d78e40
[ 4906.683733] 0000000070ccc000 0000000000000010 0700000074b4dcd0 00000000726dc800
[ 4906.683738] 0000000037e1c4e8 070000000d427960 0000000074b4dcd0 0000000070ccc000
[ 4906.683743] 6b6b6b6b6b6b6b6b 0000000000688560 000000000d427980 000000000d427920
[ 4906.683761] Krnl Code: 000000000052a97c: 58502090 l %r5,144(%r2)
[ 4906.683767] 000000000052a980: e3c010000004 lg %r12,0(%r1)
[ 4906.683773] 000000000052a986: e34020980004 lg %r4,152(%r2)
[ 4906.683780] >000000000052a98c: e330c0000004 lg %r3,0(%r12)
[ 4906.683786] 000000000052a992: a7510008 tmll %r5,8
[ 4906.683792] 000000000052a996: e33032080004 lg %r3,520(%r3)
[ 4906.683798] 000000000052a99c: 58303204 l %r3,516(%r3)
[ 4906.683803] 000000000052a9a0: a774001c brc 7,52a9d8
[ 4906.683809] Call Trace:
[ 4906.683811] ([<000000000d427980>] 0xd427980)
[ 4906.683817] [<000000000052aff2>] zfcp_fsf_fcp_cmnd_handler+0x52/0x448
[ 4906.683824] [<000000000052c3f8>] zfcp_fsf_req_complete+0x1d8/0x7e4
[ 4906.683829] [<000000000052ef2c>] zfcp_fsf_reqid_check+0xc4/0x13c
[ 4906.683835] [<000000000052fe92>] zfcp_qdio_int_resp+0x72/0x1a4
[ 4906.683841] [<00000000004eb6fe>] qdio_kick_handler+0x12e/0x2e0
[ 4906.683848] [<00000000004ecfb2>] __tiqdio_inbound_processing+0xea/0xd98
[ 4906.683854] [<00000000001552f2>] tasklet_action+0xd2/0x29c
[ 4906.683862] [<00000000001563e2>] __do_softirq+0xda/0x398
[ 4906.683868] [<000000000010f47e>] do_softirq+0xe2/0xe8
[ 4906.683876] [<0000000000156a4c>] irq_exit+0xc8/0xcc
[ 4906.683881] [<00000000004d79fa>] do_IRQ+0x20e/0x320
[ 4906.683889] [<000000000061de8c>] io_return+0x0/0x16
[ 4906.683897] [<000000000061cf78>] _raw_spin_unlock_irqrestore+0x98/0xa8
[ 4906.683904] ([<000000000061cf6e>] _raw_spin_unlock_irqrestore+0x8e/0xa8)
[ 4906.683910] [<0000000000218262>] test_set_page_writeback+0x10e/0x248
[ 4906.683919] [<00000000002b9254>] __block_write_full_page+0x310/0x5cc
[ 4906.683926] [<00000000002b9628>] block_write_full_page_endio+0x118/0x168
[ 4906.683932] [<000000000031050e>] ext3_writeback_writepage+0x1fa/0x28c
[ 4906.683940] [<0000000000218006>] __writepage+0x2e/0x88
[ 4906.683945] [<0000000000218be0>] write_cache_pages+0x224/0x600
[ 4906.683951] [<000000000021901c>] generic_writepages+0x60/0x94
[ 4906.683957] [<00000000002ace14>] writeback_single_inode+0x13c/0x53c
[ 4906.683964] [<00000000002adb80>] writeback_sb_inodes+0x1d4/0x2e4
[ 4906.683970] [<00000000002ae44c>] __writeback_inodes_wb+0xa0/0xec
[ 4906.683976] [<00000000002ae926>] wb_writeback+0x48e/0x5f8
[ 4906.683981] [<00000000002af03a>] wb_do_writeback+0x302/0x3ac
[ 4906.683987] [<00000000002af194>] bdi_writeback_thread+0xb0/0x4e0
[ 4906.683993] [<000000000017a3ea>] kthread+0xa6/0xb0
[ 4906.683999] [<000000000061d436>] kernel_thread_starter+0x6/0xc
[ 4906.684005] [<000000000061d430>] kernel_thread_starter+0x0/0xc
[ 4906.684010] INFO: lockdep is turned off.
[ 4906.684013] Last Breaking-Event-Address:
[ 4906.684016] [<000000000052afec>] zfcp_fsf_fcp_cmnd_handler+0x4c/0x448
Gonzalo also tried 2.6.38.8 as suggested and ran into this one:
[ 292.877936] ------------[ cut here ]------------
[ 292.877939] Kernel BUG at 6b6b6b6b6b6b6b6d [verbose debug info unavailable]
[ 292.877947] specification exception: 0006 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 292.877956] Modules linked in: dm_round_robin sunrpc ipv6 qeth_l2 binfmt_misc dm_multipath scsi_dh dm_mod qeth ccwgroup [last unloaded: scsi_wait_scan]
[ 292.877979] CPU: 1 Not tainted 2.6.38.8 #1
[ 292.877982] Process multipathd (pid: 352, task: 000000007bab8000, ksp: 000000007ba3ba00)
[ 292.877988] Krnl PSW : 0704000180000000 6b6b6b6b6b6b6b6d (0x6b6b6b6b6b6b6b6d)
[ 292.877997] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:0 PM:0 EA:3
[ 292.878003] Krnl GPRS: 17c0000000000000 6b6b6b6b6b6b6b6b 0000000078dc49f0 0000000000000000
[ 292.878008] 000003c001f6a728 00000000005ec230 00000000738e2910 00000000756d4aa0
[ 292.878013] 000003c000000001 000000007ba3bc58 00000000738e2910 00000000738e2a08
[ 292.878018] 000003c001f63000 0000000078dc49f0 00000000003e6c0a 000000007ba3bb80
[ 292.878024] Krnl Code: Bad PSW.
[ 292.878027] Call Trace:
[ 292.878030] ([<00000000003e6c0a>] blk_unplug+0x42/0x150)
[ 292.878040] [<000003c001f6a728>] dm_table_unplug_all+0x60/0x10c [dm_mod]
[ 292.878060] [<000003c001f65926>] dm_unplug_all+0x86/0xa8 [dm_mod]
[ 292.878069] [<000003c001f68508>] dm_suspend+0x1a4/0x394 [dm_mod]
[ 292.878078] [<000003c001f6dce6>] dev_suspend+0x21e/0x250 [dm_mod]
[ 292.878087] [<000003c001f6eaa8>] ctl_ioctl+0x1c8/0x28c [dm_mod]
[ 292.878096] [<000003c001f6eb96>] dm_ctl_ioctl+0x2a/0x38 [dm_mod]
[ 292.878105] [<000000000027df74>] do_vfs_ioctl+0x94/0x5b8
[ 292.878112] [<000000000027e52c>] SyS_ioctl+0x94/0xac
[ 292.878117] [<00000000005d8f5e>] sysc_noemu+0x16/0x1c
[ 292.878125] [<000003fffd2097ca>] 0x3fffd2097ca
[ 292.878130] INFO: lockdep is turned off.
[ 292.878133] Last Breaking-Event-Address:
[ 292.878136] [<00000000003e6c08>] blk_unplug+0x40/0x150
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