2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-08 17:44:44 -08:00
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2005-04-16 15:20:36 -07:00
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2006-11-08 17:44:44 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:26 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:26 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-08 17:44:44 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 01:37:47 -08:00
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2005-04-16 15:20:36 -07:00
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[PATCH] dm: Fix deadlock under high i/o load in raid1 setup.
On an nForce4-equipped machine with two SATA disk in raid1 setup using dmraid,
we experienced frequent deadlock of the system under high i/o load. 'cat
/dev/zero > ~/zero' was the most reliable way to reproduce them: Randomly
after a few GB, 'cp' would be left in 'D' state along with kjournald and
kmirrord. The functions cp and kjournald were blocked in did vary, but
kmirrord's wchan always pointed to 'mempool_alloc()'. We've seen this pattern
on 2.6.15 and 2.6.17 kernels. http://lkml.org/lkml/2005/4/20/142 indicates
that this problem has been around even before.
So much for the facts, here's my interpretation: mempool_alloc() first tries
to atomically allocate the requested memory, or falls back to hand out
preallocated chunks from the mempool. If both fail, it puts the calling
process (kmirrord in this case) on a private waitqueue until somebody refills
the pool. Where the only 'somebody' is kmirrord itself, so we have a
deadlock.
I worked around this problem by falling back to a (blocking) kmalloc when
before kmirrord would have ended up on the waitqueue. This defeats part of
the benefits of using the mempool, but at least keeps the system running. And
it could be done with a two-line change. Note that mempool_alloc() clears the
GFP_NOIO flag internally, and only uses it to decide whether to wait or return
an error if immediate allocation fails, so the attached patch doesn't change
behaviour in the non-deadlocking case. Path is against current git
(2.6.18-rc4), but should apply to earlier versions as well. I've tested on
2.6.15, where this patch makes the difference between random lockup and a
stable system.
Signed-off-by: Daniel Kobras <kobras@linux.de>
Acked-by: Alasdair G Kergon <agk@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-08-27 01:23:24 -07:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:41:11 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:41:11 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:42 -07:00
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2005-11-21 21:32:37 -08:00
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2005-09-09 16:23:42 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-21 21:32:37 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-21 21:32:37 -08:00
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2005-04-16 15:20:36 -07:00
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[PATCH] drivers/md/dm-raid1.c: Fix inconsistent mirroring after interrupted recovery
dm-mirror has potential data corruption problem: while on-disk log shows
that all disk contents are in-sync, actual contents of the disks are not
synchronized. This problem occurs if initial recovery (synching) is
interrupted and resumed.
Attached patch fixes this problem.
Background:
rh_dec() changes the region state from RH_NOSYNC (out-of-sync) to RH_CLEAN
(in-sync), which results in the corresponding bit of clean_bits being set.
This is harmful if on-disk log is used and the map is removed/suspended
before the initial sync is completed. The clean_bits is written down to
the on-disk log at the map removal, and, upon resume, it's read and copied
to sync_bits. Since the recovery process refers to the sync_bits to find a
region to be recovered, the region whose state was changed from RH_NOSYNC
to RH_CLEAN is no longer recovered.
If you haven't applied dm-raid1-read-balancing.patch proposed in dm-devel
sometimes ago, the contents of the mirrored disk just corrupt silently. If
you have, balanced read may get bogus data from out-of-sync disks.
The patch keeps RH_NOSYNC state unchanged. It will be changed to
RH_RECOVERING when recovery starts and get reclaimed when the recovery
completes. So it doesn't leak the region hash entry.
Description:
Keep RH_NOSYNC state unchanged when I/O on the region completes.
rh_dec() changes the region state from RH_NOSYNC (out-of-sync) to RH_CLEAN
(in-sync), which results in the corresponding bit of clean_bits being set.
This is harmful if on-disk log is used and the map is removed/suspended
before the initial sync is completed. The clean_bits is written down to
the on-disk log at the map removal, and, upon resume, it's read and copied
to sync_bits. Since the recovery process refers to the sync_bits to find a
region to be recovered, the region whose state was changed from RH_NOSYNC
to RH_CLEAN is no longer recovered.
If you haven't applied dm-raid1-read-balancing.patch proposed in dm-devel
sometimes ago, the contents of the mirrored disk just corrupt silently. If
you have, balanced read may get bogus data from out-of-sync disks.
The RH_NOSYNC region will be changed to RH_RECOVERING when recovery starts
on the region and get reclaimed when the recovery completes. So it doesn't
leak the region hash entry.
Alasdair said:
I've analysed the relevant part of the state machine and I believe that
the patch is correct.
(Further work on this code is still needed - this patch has the
side-effect of holding onto memory unnecessarily for long periods of time
under certain workloads - but better that than corrupting data.)
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Acked-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 01:17:47 -08:00
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2005-04-16 15:20:36 -07:00
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[PATCH] drivers/md/dm-raid1.c: Fix inconsistent mirroring after interrupted recovery
dm-mirror has potential data corruption problem: while on-disk log shows
that all disk contents are in-sync, actual contents of the disks are not
synchronized. This problem occurs if initial recovery (synching) is
interrupted and resumed.
Attached patch fixes this problem.
Background:
rh_dec() changes the region state from RH_NOSYNC (out-of-sync) to RH_CLEAN
(in-sync), which results in the corresponding bit of clean_bits being set.
This is harmful if on-disk log is used and the map is removed/suspended
before the initial sync is completed. The clean_bits is written down to
the on-disk log at the map removal, and, upon resume, it's read and copied
to sync_bits. Since the recovery process refers to the sync_bits to find a
region to be recovered, the region whose state was changed from RH_NOSYNC
to RH_CLEAN is no longer recovered.
If you haven't applied dm-raid1-read-balancing.patch proposed in dm-devel
sometimes ago, the contents of the mirrored disk just corrupt silently. If
you have, balanced read may get bogus data from out-of-sync disks.
The patch keeps RH_NOSYNC state unchanged. It will be changed to
RH_RECOVERING when recovery starts and get reclaimed when the recovery
completes. So it doesn't leak the region hash entry.
Description:
Keep RH_NOSYNC state unchanged when I/O on the region completes.
rh_dec() changes the region state from RH_NOSYNC (out-of-sync) to RH_CLEAN
(in-sync), which results in the corresponding bit of clean_bits being set.
This is harmful if on-disk log is used and the map is removed/suspended
before the initial sync is completed. The clean_bits is written down to
the on-disk log at the map removal, and, upon resume, it's read and copied
to sync_bits. Since the recovery process refers to the sync_bits to find a
region to be recovered, the region whose state was changed from RH_NOSYNC
to RH_CLEAN is no longer recovered.
If you haven't applied dm-raid1-read-balancing.patch proposed in dm-devel
sometimes ago, the contents of the mirrored disk just corrupt silently. If
you have, balanced read may get bogus data from out-of-sync disks.
The RH_NOSYNC region will be changed to RH_RECOVERING when recovery starts
on the region and get reclaimed when the recovery completes. So it doesn't
leak the region hash entry.
Alasdair said:
I've analysed the relevant part of the state machine and I believe that
the patch is correct.
(Further work on this code is still needed - this patch has the
side-effect of holding onto memory unnecessarily for long periods of time
under certain workloads - but better that than corrupting data.)
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Acked-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 01:17:47 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-21 21:32:37 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:24:41 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-08 17:44:44 -08:00
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2005-04-16 15:20:36 -07:00
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2006-11-08 17:44:44 -08:00
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2005-04-16 15:20:36 -07:00
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2006-11-08 17:44:44 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:30 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:05 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:05 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:05 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:05 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:05 -08:00
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2005-04-16 15:20:36 -07:00
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2006-11-22 14:57:56 +00:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:05 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:17:48 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:17:48 -08:00
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2006-06-26 00:27:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:35 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:35 -07:00
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2005-04-16 15:20:36 -07:00
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2005-07-07 17:59:34 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:26 -07:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:41:06 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:41:06 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:41:06 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:41:06 -08:00
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2005-04-16 15:20:36 -07:00
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2006-11-08 17:44:44 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:17:48 -08:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:32 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:32 -07:00
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2006-03-27 01:17:48 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:28 -07:00
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2005-04-16 15:20:36 -07:00
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2005-08-04 12:53:37 -07:00
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2005-04-16 15:20:36 -07:00
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2006-11-22 14:57:56 +00:00
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2005-04-16 15:20:36 -07:00
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