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v4.18.8
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John Pittman aee3d110a1 dm kcopyd: avoid softlockup in run_complete_job 
[ Upstream commit 784c9a29e9 ]

It was reported that softlockups occur when using dm-snapshot ontop of
slow (rbd) storage.  E.g.:

[ 4047.990647] watchdog: BUG: soft lockup - CPU#10 stuck for 22s! [kworker/10:23:26177]
...
[ 4048.034151] Workqueue: kcopyd do_work [dm_mod]
[ 4048.034156] RIP: 0010:copy_callback+0x41/0x160 [dm_snapshot]
...
[ 4048.034190] Call Trace:
[ 4048.034196]  ? __chunk_is_tracked+0x70/0x70 [dm_snapshot]
[ 4048.034200]  run_complete_job+0x5f/0xb0 [dm_mod]
[ 4048.034205]  process_jobs+0x91/0x220 [dm_mod]
[ 4048.034210]  ? kcopyd_put_pages+0x40/0x40 [dm_mod]
[ 4048.034214]  do_work+0x46/0xa0 [dm_mod]
[ 4048.034219]  process_one_work+0x171/0x370
[ 4048.034221]  worker_thread+0x1fc/0x3f0
[ 4048.034224]  kthread+0xf8/0x130
[ 4048.034226]  ? max_active_store+0x80/0x80
[ 4048.034227]  ? kthread_bind+0x10/0x10
[ 4048.034231]  ret_from_fork+0x35/0x40
[ 4048.034233] Kernel panic - not syncing: softlockup: hung tasks

Fix this by calling cond_resched() after run_complete_job()'s callout to
the dm_kcopyd_notify_fn (which is dm-snap.c:copy_callback in the above
trace).

Signed-off-by: John Pittman <jpittman@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-09-15 09:46:53 +02:00
..
bcache
bcache: release dc->writeback_lock properly in bch_writeback_thread()
2018-09-09 10:32:41 +02:00
persistent-data
dm bufio: move dm-bufio.h to include/linux/
2018-04-03 15:04:23 -04:00
dm-bio-prison-v1.c
dm: adjust structure members to improve alignment
2018-06-08 11:53:14 -04:00
dm-bio-prison-v1.h
…
dm-bio-prison-v2.c
dm: adjust structure members to improve alignment
2018-06-08 11:53:14 -04:00
dm-bio-prison-v2.h
…
dm-bio-record.h
…
dm-bufio.c
dm bufio: fix buffer alignment
2018-04-30 11:51:39 -04:00
dm-builtin.c
…
dm-cache-background-tracker.c
dm cache background tracker: fix sparse warning
2018-04-30 15:40:40 -04:00
dm-cache-background-tracker.h
…
dm-cache-block-types.h
…
dm-cache-metadata.c
dm cache metadata: set dirty on all cache blocks after a crash
2018-09-09 10:32:33 +02:00
dm-cache-metadata.h
…
dm-cache-policy-internal.h
…
dm-cache-policy-smq.c
treewide: Use array_size() in vzalloc()
2018-06-12 16:19:22 -07:00
dm-cache-policy.c
…
dm-cache-policy.h
…
dm-cache-target.c
dm: adjust structure members to improve alignment
2018-06-08 11:53:14 -04:00
dm-core.h
dm: adjust structure members to improve alignment
2018-06-08 11:53:14 -04:00
dm-crypt.c
dm crypt: don't decrease device limits
2018-09-09 10:32:33 +02:00
dm-delay.c
dm: backfill missing calls to mutex_destroy()
2018-01-17 09:16:15 -05:00
dm-era-target.c
dm: allow targets to return output from messages they are sent
2018-04-03 15:04:10 -04:00
dm-exception-store.c
…
dm-exception-store.h
…
dm-flakey.c
dm: remove fmode_t argument from .prepare_ioctl hook
2018-04-04 12:12:39 -04:00
dm-integrity.c
dm integrity: change 'suspending' variable from bool to int
2018-09-09 10:32:33 +02:00
dm-io.c
dm: Use kzalloc for all structs with embedded biosets/mempools
2018-06-05 08:47:43 -06:00
dm-ioctl.c
dm: report which conflicting type caused error during table_load()
2018-06-08 09:50:15 -04:00
dm-kcopyd.c
dm kcopyd: avoid softlockup in run_complete_job
2018-09-15 09:46:53 +02:00
dm-linear.c
dax: Introduce a ->copy_to_iter dax operation
2018-05-22 23:18:31 -07:00
dm-log-userspace-base.c
dm: convert to bioset_init()/mempool_init()
2018-05-30 15:33:32 -06:00
dm-log-userspace-transfer.c
…
dm-log-userspace-transfer.h
…
dm-log-writes.c
dax: Introduce a ->copy_to_iter dax operation
2018-05-22 23:18:31 -07:00
dm-log.c
…
dm-mpath.c
block: sanitize blk_get_request calling conventions
2018-05-14 08:55:12 -06:00
dm-mpath.h
…
dm-path-selector.c
…
dm-path-selector.h
…
dm-queue-length.c
dm mpath selector: more evenly distribute ties
2018-01-29 13:44:58 -05:00
dm-raid1.c
dm mirror: remove VLA usage
2018-05-04 10:35:20 -04:00
dm-raid.c
dm raid: don't use 'const' in function return
2018-06-22 14:51:12 -04:00
dm-region-hash.c
Merge tag 'overflow-v4.18-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2018-06-12 18:28:00 -07:00
dm-round-robin.c
…
dm-rq.c
dm: convert to bioset_init()/mempool_init()
2018-05-30 15:33:32 -06:00
dm-rq.h
…
dm-service-time.c
dm mpath selector: more evenly distribute ties
2018-01-29 13:44:58 -05:00
dm-snap-persistent.c
dm bufio: move dm-bufio.h to include/linux/
2018-04-03 15:04:23 -04:00
dm-snap-transient.c
…
dm-snap.c
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
dm-stats.c
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
dm-stats.h
…
dm-stripe.c
dax: Introduce a ->copy_to_iter dax operation
2018-05-22 23:18:31 -07:00
dm-switch.c
treewide: Use array_size() in vmalloc()
2018-06-12 16:19:22 -07:00
dm-sysfs.c
…
dm-table.c
dm: prevent DAX mounts if not supported
2018-06-28 16:06:14 -04:00
dm-target.c
dm: remove unused macro DM_MOD_NAME_SIZE
2018-04-03 15:04:15 -04:00
dm-thin-metadata.c
dm thin metadata: remove needless work from __commit_transaction
2018-06-22 14:51:11 -04:00
dm-thin-metadata.h
…
dm-thin.c
dm thin: stop no_space_timeout worker when switching to write-mode
2018-09-09 10:32:33 +02:00
dm-uevent.c
…
dm-uevent.h
…
dm-unstripe.c
dm unstripe: remove unnecessary header includes
2018-04-03 15:04:15 -04:00
dm-verity-fec.c
Merge tag 'rslib-v4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2018-06-05 10:48:05 -07:00
dm-verity-fec.h
dm: convert to bioset_init()/mempool_init()
2018-05-30 15:33:32 -06:00
dm-verity-target.c
treewide: kvzalloc() -> kvcalloc()
2018-06-12 16:19:22 -07:00
dm-verity.h
dm verity: add 'check_at_most_once' option to only validate hashes once
2018-04-03 15:04:29 -04:00
dm-writecache.c
dm writecache: fix a crash due to reading past end of dirty_bitmap
2018-09-09 10:32:34 +02:00
dm-zero.c
…
dm-zoned-metadata.c
dm: backfill missing calls to mutex_destroy()
2018-01-17 09:16:15 -05:00
dm-zoned-reclaim.c
…
dm-zoned-target.c
dm zoned: avoid triggering reclaim from inside dmz_map()
2018-06-22 14:51:12 -04:00
dm-zoned.h
…
dm.c
dm: prevent DAX mounts if not supported
2018-06-28 16:06:14 -04:00
dm.h
dm: move dm_table_destroy() to same header as dm_table_create()
2018-01-17 09:16:06 -05:00
Kconfig
dm: add writecache target
2018-06-08 11:59:51 -04:00
Makefile
dm: add writecache target
2018-06-08 11:59:51 -04:00
md-bitmap.c
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
md-bitmap.h
…
md-cluster.c
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
md-cluster.h
…
md-faulty.c
md: convert to bioset_init()/mempool_init()
2018-05-30 15:33:32 -06:00
md-linear.c
md: convert to bioset_init()/mempool_init()
2018-05-30 15:33:32 -06:00
md-linear.h
…
md-multipath.c
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
md-multipath.h
md: convert to bioset_init()/mempool_init()
2018-05-30 15:33:32 -06:00
md.c
MD: cleanup resources in failure
2018-06-18 09:46:13 -07:00
md.h
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md
2018-06-09 12:01:36 -07:00
raid0.c
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
raid0.h
…
raid1-10.c
…
raid1.c
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
raid1.h
md: convert to bioset_init()/mempool_init()
2018-05-30 15:33:32 -06:00
raid5-cache.c
md: convert to bioset_init()/mempool_init()
2018-05-30 15:33:32 -06:00
raid5-log.h
raid5-ppl: fix handling flush requests
2018-02-21 09:40:40 -08:00
raid5-ppl.c
md: convert to bioset_init()/mempool_init()
2018-05-30 15:33:32 -06:00
raid5.c
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
raid5.h
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md
2018-06-09 12:01:36 -07:00
raid10.c
md/raid10: fix that replacement cannot complete recovery after reassemble
2018-06-28 13:04:49 -07:00
raid10.h
md: convert to bioset_init()/mempool_init()
2018-05-30 15:33:32 -06:00