John Pittman bf8c973dea dm kcopyd: avoid softlockup in run_complete_job ... [ Upstream commit 784c9a29e99eb40b842c29ecf1cc3a79e00fb629 ] 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>		2019-07-27 21:51:38 +02:00
..
bcache	UPSTREAM: block: disable entropy contributions for nonrot devices	2019-07-27 21:47:56 +02:00
persistent-data	dm btree: fix serious bug in btree_split_beneath()	2019-07-27 21:46:30 +02:00
Kconfig	Import latest Samsung release	2017-04-18 03:43:52 +02:00
Makefile	Import latest Samsung release	2017-04-18 03:43:52 +02:00
bitmap.c	md/bitmap: disable bitmap_resize for file-backed bitmaps.	2019-07-27 21:44:22 +02:00
bitmap.h	…
dm-android-verity.c	ANDROID: dm: Add android verity target	2016-05-18 14:36:11 +05:30
dm-android-verity.h	ANDROID: dm: Add android verity target	2016-05-18 14:36:11 +05:30
dm-bio-prison.c	…
dm-bio-prison.h	…
dm-bio-record.h	…
dm-bufio.c	dm bufio: fix integer overflow when limiting maximum cache size	2019-07-27 21:46:08 +02:00
dm-bufio.h	…
dm-builtin.c	…
dm-cache-block-types.h	…
dm-cache-metadata.c	…
dm-cache-metadata.h	…
dm-cache-policy-cleaner.c	…
dm-cache-policy-internal.h	…
dm-cache-policy-mq.c	…
dm-cache-policy.c	…
dm-cache-policy.h	…
dm-cache-target.c	dm: fix various targets to dm_register_target after module __init resources created	2019-07-27 21:46:15 +02:00
dm-crypt.c	dm crypt: mark key as invalid until properly loaded	2019-07-27 21:43:29 +02:00
dm-delay.c	…
dm-dirty.c	Import latest Samsung release	2017-04-18 03:43:52 +02:00
dm-exception-store.c	…
dm-exception-store.h	…
dm-flakey.c	…
dm-io.c	…
dm-ioctl.c	dm ioctl: prevent stack leak in dm ioctl call	2017-09-04 01:21:07 -07:00
dm-kcopyd.c	dm kcopyd: avoid softlockup in run_complete_job	2019-07-27 21:51:38 +02:00
dm-linear.c	…
dm-log-userspace-base.c	…
dm-log-userspace-transfer.c	…
dm-log-userspace-transfer.h	…
dm-log.c	…
dm-mpath.c	dm: fix various targets to dm_register_target after module __init resources created	2019-07-27 21:46:15 +02:00
dm-mpath.h	…
dm-path-selector.c	…
dm-path-selector.h	…
dm-queue-length.c	…
dm-raid.c	…
dm-raid1.c	…
dm-region-hash.c	…
dm-req-crypt.c	md: dm-req-crypt: fixed error propagation when ICE is used	2019-07-27 21:50:38 +02:00
dm-round-robin.c	…
dm-service-time.c	…
dm-snap-persistent.c	…
dm-snap-transient.c	…
dm-snap.c	dm: fix various targets to dm_register_target after module __init resources created	2019-07-27 21:46:15 +02:00
dm-stripe.c	…
dm-sysfs.c	…
dm-table.c	dm: discard support requires all targets in a table support discards	2019-07-27 21:46:08 +02:00
dm-target.c	…
dm-thin-metadata.c	…
dm-thin-metadata.h	…
dm-thin.c	dm: fix various targets to dm_register_target after module __init resources created	2019-07-27 21:46:15 +02:00
dm-uevent.c	…
dm-uevent.h	…
dm-verity-fec.c	dm verity: add ignore_zero_blocks feature	2016-05-18 14:34:43 +05:30
dm-verity-fec.h	dm verity: add support for forward error correction	2016-05-18 14:34:43 +05:30
dm-verity-target.c	Import latest Samsung release	2017-04-18 03:43:52 +02:00
dm-verity.h	ANDROID: dm: Add android verity target	2016-05-18 14:36:11 +05:30
dm-zero.c	…
dm.c	dm: fix race between dm_get_from_kobject() and __dm_destroy()	2019-07-27 21:46:07 +02:00
dm.h	…
faulty.c	…
linear.c	md linear: fix a race between linear_add() and linear_congested()	2019-07-27 21:43:30 +02:00
linear.h	md linear: fix a race between linear_add() and linear_congested()	2019-07-27 21:43:30 +02:00
md.c	md: fix super_offset endianness in super_1_rdev_size_change	2019-07-27 21:44:23 +02:00
md.h	…
multipath.c	…
multipath.h	…
raid0.c	…
raid0.h	…
raid1.c	md: don't use flush_signals in userspace processes	2019-07-27 21:44:54 +02:00
raid1.h	…
raid5.c	md: don't use flush_signals in userspace processes	2019-07-27 21:44:54 +02:00
raid5.h	…
raid10.c	md/raid10: submit bio directly to replacement disk	2019-07-27 21:44:23 +02:00
raid10.h	…