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Date:      Tue, 15 Jan 2013 17:07:38 -0700
From:      "Reed A. Cartwright" <cartwright@asu.edu>
To:        olivier <olivier777a7@gmail.com>
Cc:        freebsd-fs@freebsd.org, ken@freebsd.org, "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org>, Andriy Gapon <avg@freebsd.org>
Subject:   Re: CAM hangs in 9-STABLE? [Was: NFS/ZFS hangs after upgrading from 9.0-RELEASE to -STABLE]
Message-ID:  <CALOkxuyJXTj9U2JaG2Qa0aTU0eUdptMLgCzJJebadGTJjECRRg@mail.gmail.com>
In-Reply-To: <CALC5%2B1MEQ3kqqGqk=dhSFLXSJA2fdR1smvKKjch0QeG_mhJX2g@mail.gmail.com>
References:  <CALC5%2B1MbmG8xyKmr6LVYvrFOOWrv-v=BR6JkyG4jW_d3-Js7GA@mail.gmail.com> <CALC5%2B1MEQ3kqqGqk=dhSFLXSJA2fdR1smvKKjch0QeG_mhJX2g@mail.gmail.com>

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I don't know if this is relevant or not, but I deadlock was recently
fixed in the VFS code:

http://svnweb.freebsd.org/base?view=revision&revision=244795

On Tue, Jan 15, 2013 at 12:55 PM, olivier <olivier777a7@gmail.com> wrote:
> Dear All,
> Still experiencing the same hangs I reported earlier with 9.1. I've been
> running a kernel with WITNESS enabled to provide more information.
>
> During an occurrence of the hang, running show alllocks gave
>
> Process 25777 (sysctl) thread 0xfffffe014c5b2920 (102567)
> exclusive sleep mutex Giant (Giant) r = 0 (0xffffffff811e34c0) locked @
> /usr/src/sys/dev/usb/usb_transfer.c:3171
> Process 25750 (sshd) thread 0xfffffe015a688000 (104313)
> exclusive sx so_rcv_sx (so_rcv_sx) r = 0 (0xfffffe0204e0bb98) locked @
> /usr/src/sys/kern/uipc_sockbuf.c:148
> Process 24922 (cnid_dbd) thread 0xfffffe0187ac4920 (103597)
> shared lockmgr zfs (zfs) r = 0 (0xfffffe0973062488) locked @
> /usr/src/sys/kern/vfs_syscalls.c:3591
> Process 24117 (sshd) thread 0xfffffe07bd914490 (104195)
> exclusive sx so_rcv_sx (so_rcv_sx) r = 0 (0xfffffe0204e0a8f0) locked @
> /usr/src/sys/kern/uipc_sockbuf.c:148
> Process 1243 (java) thread 0xfffffe01ca85d000 (102704)
> exclusive sleep mutex pmap (pmap) r = 0 (0xfffffe015aec1440) locked @
> /usr/src/sys/amd64/amd64/pmap.c:4840
> exclusive rw pmap pv global (pmap pv global) r = 0 (0xffffffff81409780)
> locked @ /usr/src/sys/amd64/amd64/pmap.c:4802
> exclusive sleep mutex vm page (vm page) r = 0 (0xffffffff813f0a80) locked @
> /usr/src/sys/vm/vm_object.c:1128
> exclusive sleep mutex vm object (standard object) r = 0
> (0xfffffe01458e43a0) locked @ /usr/src/sys/vm/vm_object.c:1076
> shared sx vm map (user) (vm map (user)) r = 0 (0xfffffe015aec1388) locked @
> /usr/src/sys/vm/vm_map.c:2045
> Process 994 (nfsd) thread 0xfffffe015a0df000 (102426)
> shared lockmgr zfs (zfs) r = 0 (0xfffffe0c3b505878) locked @
> /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c:1760
> Process 994 (nfsd) thread 0xfffffe015a0f8490 (102422)
> exclusive lockmgr zfs (zfs) r = 0 (0xfffffe02db3b3e60) locked @
> /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c:1760
> Process 931 (syslogd) thread 0xfffffe015af18920 (102365)
> shared lockmgr zfs (zfs) r = 0 (0xfffffe0141dd6680) locked @
> /usr/src/sys/kern/vfs_syscalls.c:3591
> Process 22 (syncer) thread 0xfffffe0125077000 (100279)
> exclusive lockmgr syncer (syncer) r = 0 (0xfffffe015a2ff680) locked @
> /usr/src/sys/kern/vfs_subr.c:1809
>
> I don't have full "show lockedvnods" output because the output does not get
> captured by ddb after using "capture on", it doesn't fit on a single
> screen, and doesn't get piped into a "more" equivalent. What I did manage
> to get (copied by hand, typos possible) is:
>
> 0xfffffe0c3b5057e0: 0xfffffe0c3b5057e0: tag zfs, type VREG
> tag zfs, type VREG
> usecount 1, writecount 0, refcount 1 mountedhere 0
> usecount 1, writecount 0, refcount 1 mountedhere 0
> flags (VI_ACTIVE)
> flags (VI_ACTIVE)
> v_object 0xfffffe089bc1b828 ref 0 pages 0
> v_object 0xfffffe089bc1b828 ref 0 pages 0
> lock type zfs: SHARED (count 1)
> lock type zfs: SHARED (count 1)
>
> 0xfffffe02db3b3dc8: 0xfffffe02db3b3dc8: tag zfs, type VREG
> tag zfs, type VREG
> usecount 6, writecount 0, refcount 6 mountedhere 0
> usecount 6, writecount 0, refcount 6 mountedhere 0
> flags (VI_ACTIVE)
> flags (VI_ACTIVE)
> v_object 0xfffffe0b79583ae0 ref 0 pages 0
> v_object 0xfffffe0b79583ae0 ref 0 pages 0
> lock type zfs: EXCL by thread 0xfffffe015a0f8490 (pid 994)
> lock type zfs: EXCL by thread 0xfffffe015a0f8490 (pid 994)
> with exclusive waiters pending
> with exclusive waiters pending
>
> The output of show witness is at http://pastebin.com/eSRb3FEu
>
> The output of alltrace is at http://pastebin.com/X1LruNrf (a number of
> threads are stuck in zio_wait, none I can find in zio_interrupt, and
> according to gstat and disks eventually going to sleep all disk IO seems to
> be stuck for good; I think Andriy explained earlier that these criteria
> might indicate this is a ZFS hang).
>
> The output of show geom is at http://pastebin.com/6nwQbKr4
>
> The output of vmstat -i is at http://pastebin.com/9LcZ7Mi0 Interrupts are
> occurring at a normal rate during the hang, as far as I can tell.
>
> Any help would be greatly appreciated.
> Thanks
> Olivier
> PS: my kernel was compiled from 9-STABLE from December, with CAM and ahci
> from 9.0 (in the hope it would fix the hangs I was experiencing in plain
> 9-STABLE; obviously the hangs are still occurring). The rest of my
> configuration is the same as posted earlier.
>
> On Mon, Dec 24, 2012 at 9:42 PM, olivier <olivier777a7@gmail.com> wrote:
>
>> Dear All
>> It turns out that reverting to an older version of the mps driver did not
>> fix the ZFS hangs I've been struggling with in 9.1 and 9-STABLE after all
>> (they just took a bit longer to occur again, possibly just by chance). I
>> followed steps along lines suggested by Andriy to collect more information
>> when the problem occurs. Hopefully this will help figure out what's going
>> on.
>>
>> As far as I can tell, what happens is that at some point IO operations to
>> a bunch of drives that belong to different pools get stuck. For these
>> drives, gstat shows no activity but 1 pending operation, as such:
>>
>>  L(q)  ops/s    r/s   kBps   ms/r    w/s   kBps   ms/w    d/s   kBps
>> ms/d   %busy Name
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da1
>>
>> I've been running gstat in a loop (every 100s) to monitor the machine.
>> Just before the hang occurs, everything seems fine (see full gstat output
>> below). Right after the hang occurs a number of drives seem stuck (see full
>> gstat output below). Notably, some stuck drives are seen through the mps
>> driver and others through the mpt driver. So the problem doesn't seem to be
>> driver-specific. I have had the problem occur (at a lower frequency) on
>> similar machines that don't use the mpt driver (and only have 1 disk
>> provided through mps), so the problem doesn't seem to be caused by the mpt
>> driver (and is likely not caused by defective hardware). Since based on the
>> information I provided earlier Andriy thinks the problem might not
>> originate in ZFS, perhaps that means that the problem is in the CAM layer?
>>
>> camcontrol tags -v (as suggested by Andriy) in the hung state shows for
>> example
>>
>> (pass56:mpt1:0:8:20): dev_openings  254
>> (pass56:mpt1:0:8:20): dev_active    1
>> (pass56:mpt1:0:8:20): devq_openings 254
>> (pass56:mpt1:0:8:20): devq_queued   0
>> (pass56:mpt1:0:8:20): held          0
>> (pass56:mpt1:0:8:20): mintags       2
>> (pass56:mpt1:0:8:20): maxtags       255
>> (I'm not providing full camcontrol tags output below because I couldn't
>> get it to run during the specific hang I documented most thoroughly; the
>> example above is from a different occurrence of the hang).
>>
>> The buses don't seem completely frozen: if I manually remove drives while
>> the machine is hanging, that's picked up by the mpt driver, which prints
>> out corresponding messages to the console. But camcontrol reset all or
>> rescan all don't seem to do anything.
>>
>> I've tried reducing vfs.zfs.vdev.min_pending and vfs.zfs.vdev.max_pending
>> to 1, to no avail.
>>
>> Any suggestions to resolve this problem, work around it, or further
>> investigate it would be greatly appreciated!
>> Thanks a lot
>> Olivier
>>
>> Detailed information:
>>
>> Output of procstat -a -kk when the machine is hanging is available at
>> http://pastebin.com/7D2KtT35 (not putting it here because it's pretty
>> long)
>>
>> dmesg is available at http://pastebin.com/9zJQwWJG . Note that I'm using
>> LUN masking, so the "illegal requests" reported aren't really errors. Maybe
>> one day if I get my problems sorted out I'll use geom multipathing instead.
>>
>> My kernel config is
>> include GENERIC
>> ident MYKERNEL
>>
>> options IPSEC
>> device crypto
>>
>> options OFED # Infiniband protocol
>>
>> device mlx4ib # ConnectX Infiniband support
>> device mlxen # ConnectX Ethernet support
>> device mthca # Infinihost cards
>> device ipoib # IP over IB devices
>>
>> options         ATA_CAM         # Handle legacy controllers with CAM
>> options         ATA_STATIC_ID   # Static device numbering
>>
>> options KDB
>> options DDB
>>
>>
>>
>> Full output of gstat just before the hang (at most 100s before the hang):
>>  L(q)  ops/s    r/s   kBps   ms/r    w/s   kBps   ms/w    d/s   kBps
>> ms/d   %busy Name
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da2
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da0
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da2/da2
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da0/da0
>>     1     85     48     79    4.7     35     84    0.5      0      0
>>  0.0   24.3  da1
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da1/da1
>>     1     83     47     77    4.3     34     79    0.5      0      0
>>  0.0   22.1  da4
>>     1   1324   1303  21433    0.6     19     42    0.7      0      0
>>  0.0   79.8  da3
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da5
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da6
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da7
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da8
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da9
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da10
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da11
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da12
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da13
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da14
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da15
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da16
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da17
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da18
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da19
>>     0     97     57     93    3.5     38     84    0.3      0      0
>>  0.0   21.3  da20
>>     0     85     47     69    3.3     36     86    0.4      0      0
>>  0.0   16.8  da21
>>     0   1666   1641  18992    0.3     23     43    0.4      0      0
>>  0.0   57.9  da22
>>     0     93     55     98    3.5     36     87    0.4      0      0
>>  0.0   20.6  da23
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da24
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da25
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da26
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da27
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da28
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da29
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da30
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da31
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da32
>>     0   1200      0      0    0.0   1198  11751    0.6      0      0
>>  0.0   67.3  da33
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da34
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da35
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da36
>>     0     81     44     67    2.0     35     84    0.3      0      0
>>  0.0   10.1  da37
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da38
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da39
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da40
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da41
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da42
>>     1   1020    999  22028    0.8     19     42    0.7      0      0
>>  0.0   84.8  da43
>>     0   1050   1029  23479    0.8     19     47    0.7      0      0
>>  0.0   83.3  da44
>>     1   1006    984  22758    0.8     21     46    0.6      0      0
>>  0.0   84.8  da45
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da46
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da47
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da48
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da49
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da50
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  cd0
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da4/da4
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da3/da3
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da5/da5
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da6/da6
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da7/da7
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da8/da8
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da9/da9
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da10/da10
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da11/da11
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da12/da12
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da13/da13
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da14/da14
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da15/da15
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da16/da16
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da17/da17
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da18/da18
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da19/da19
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da20/da20
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da21/da21
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da22/da22
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da23/da23
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da24/da24
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da25/da25
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da26/da26
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  PART/da26/da26
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da26p1
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da26p2
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da26p3
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da27/da27
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da28/da28
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da29/da29
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da30/da30
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da31/da31
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da32/da32
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da33/da33
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da34/da34
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da35/da35
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da36/da36
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da37/da37
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da38/da38
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da39/da39
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da40/da40
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da41/da41
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da42/da42
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da43/da43
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da44/da44
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da45/da45
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da46/da46
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da47/da47
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da48/da48
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da49/da49
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da50/da50
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/cd0/cd0
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da26p1/da26p1
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da26p2/da26p2
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  LABEL/da26p1/da26p1
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  gptid/84d4487b-34e3-11e2-b773-00259058949a
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da26p3/da26p3
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  LABEL/da26p2/da26p2
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  gptid/b4255780-34e3-11e2-b773-00259058949a
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0
>>  DEV/gptid/84d4487b-34e3-11e2-b773-00259058949a/gptid/84d4487b-34e3-11e2-b773-00259058949a
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da25
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0
>>  DEV/gptid/b4255780-34e3-11e2-b773-00259058949a/gptid/b4255780-34e3-11e2-b773-00259058949a
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da40
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da41
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da26p3
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da29
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da30
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da24
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da6
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da7
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da16
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da17
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da20
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da21
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da37
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da23
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da1
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da4
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da43
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da44
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da22
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da33
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da45
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da3
>>
>>
>> Full output of gstat just after the hang (at most 100s after the hang):
>>  L(q)  ops/s    r/s   kBps   ms/r    w/s   kBps   ms/w    d/s   kBps
>> ms/d   %busy Name
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da2
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da0
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da2/da2
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da0/da0
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da1
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da1/da1
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da4
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da3
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da5
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da6
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da7
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da8
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da9
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da10
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da11
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da12
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da13
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da14
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da15
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da16
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da17
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da18
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da19
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da20
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da21
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da22
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da23
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da24
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da25
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da26
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da27
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da28
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da29
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da30
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da31
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da32
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da33
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da34
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da35
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da36
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da37
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da38
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da39
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da40
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da41
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da42
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da43
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da44
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da45
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da46
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da47
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da48
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da49
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da50
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  cd0
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da4/da4
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da3/da3
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da5/da5
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da6/da6
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da7/da7
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da8/da8
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da9/da9
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da10/da10
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da11/da11
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da12/da12
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da13/da13
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da14/da14
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da15/da15
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da16/da16
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da17/da17
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da18/da18
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da19/da19
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da20/da20
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da21/da21
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da22/da22
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da23/da23
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da24/da24
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da25/da25
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da26/da26
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  PART/da26/da26
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da26p1
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da26p2
>>     1      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  da26p3
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da27/da27
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da28/da28
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da29/da29
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da30/da30
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da31/da31
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da32/da32
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da33/da33
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da34/da34
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da35/da35
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da36/da36
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da37/da37
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da38/da38
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da39/da39
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da40/da40
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da41/da41
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da42/da42
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da43/da43
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da44/da44
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da45/da45
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da46/da46
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da47/da47
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da48/da48
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da49/da49
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da50/da50
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/cd0/cd0
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da26p1/da26p1
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da26p2/da26p2
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  LABEL/da26p1/da26p1
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  gptid/84d4487b-34e3-11e2-b773-00259058949a
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  DEV/da26p3/da26p3
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  LABEL/da26p2/da26p2
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  gptid/b4255780-34e3-11e2-b773-00259058949a
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0
>>  DEV/gptid/84d4487b-34e3-11e2-b773-00259058949a/gptid/84d4487b-34e3-11e2-b773-00259058949a
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da25
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0
>>  DEV/gptid/b4255780-34e3-11e2-b773-00259058949a/gptid/b4255780-34e3-11e2-b773-00259058949a
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da40
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da41
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da26p3
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da29
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da30
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da24
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da6
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da7
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da16
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da17
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da20
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da21
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da37
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da23
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da1
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da4
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da43
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da44
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da22
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da33
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da45
>>     0      0      0      0    0.0      0      0    0.0      0      0
>>  0.0    0.0  ZFS::VDEV/zfs::vdev/da3
>>
>>
>> On Thu, Dec 13, 2012 at 10:14 PM, olivier <olivier777a7@gmail.com> wrote:
>>
>>> For what it's worth, I think I might have solved my problem by reverting
>>> to an older version of the mps driver. I checked out a recent version of
>>> 9-STABLE and reversed the changes in
>>> http://svnweb.freebsd.org/base?view=revision&revision=230592 (perhaps
>>> there was a simpler way of reverting to the older mps driver). So far so
>>> good, no hang even when hammering the file system.
>>>
>>> This does not conclusively prove that the new LSI mps driver is at fault,
>>> but that seems to be a likely explanation.
>>>
>>> Thanks to everybody who pointed me in the right direction. Hope this
>>> helps others who run into similar problems with 9.1
>>>  Olivier
>>>
>>>
>>> On Thu, Dec 13, 2012 at 10:14 AM, olivier <olivier777a7@gmail.com> wrote:
>>>
>>>>
>>>>
>>>> On Thu, Dec 13, 2012 at 9:54 AM, Andriy Gapon <avg@freebsd.org> wrote:
>>>>
>>>>> Google for "zfs deadman".  This is already committed upstream and I
>>>>> think that it
>>>>> is imported into FreeBSD, but I am not sure...  Maybe it's imported
>>>>> just into the
>>>>> vendor area and is not merged yet.
>>>>>
>>>>
>>>> Yes, that's exactly what I had in mind. The logic for panicking makes
>>>> sense.
>>>> As far as I can tell you're correct that deadman is in the vendor area
>>>> but not merged. Any idea when it might make it into 9-STABLE?
>>>> Thanks
>>>> Olivier
>>>>
>>>>
>>>>
>>>>
>>>>> So, when enabled this logic would panic a system as a way of letting
>>>>> know that
>>>>> something is wrong.  You can read in the links why panic was selected
>>>>> for this job.
>>>>>
>>>>> And speaking FreeBSD-centric - I think that our CAM layer would be a
>>>>> perfect place
>>>>> to detect such issues in non-ZFS-specific way.
>>>>>
>>>>> --
>>>>> Andriy Gapon
>>>>>
>>>>
>>>>
>>>
>>
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-- 
Reed A. Cartwright, PhD
Assistant Professor of Genomics, Evolution, and Bioinformatics
School of Life Sciences
Center for Evolutionary Medicine and Informatics
The Biodesign Institute
Arizona State University



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