Junxiao Bi
0d78b27b83
dm bufio: fix deadlock with loop device ...
commit bd293d071ffe65e645b4d8104f9d8fe15ea13862 upstream.
When thin-volume is built on loop device, if available memory is low,
the following deadlock can be triggered:
One process P1 allocates memory with GFP_FS flag, direct alloc fails,
memory reclaim invokes memory shrinker in dm_bufio, dm_bufio_shrink_scan()
runs, mutex dm_bufio_client->lock is acquired, then P1 waits for dm_buffer
IO to complete in __try_evict_buffer().
But this IO may never complete if issued to an underlying loop device
that forwards it using direct-IO, which allocates memory using
GFP_KERNEL (see: do_blockdev_direct_IO()). If allocation fails, memory
reclaim will invoke memory shrinker in dm_bufio, dm_bufio_shrink_scan()
will be invoked, and since the mutex is already held by P1 the loop
thread will hang, and IO will never complete. Resulting in ABBA
deadlock.
Cc: stable@vger.kernel.org
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-08-04 09:33:32 +02:00
bcache: check c->gc_thread by IS_ERR_OR_NULL in cache_set_flush()
2019-08-04 09:33:23 +02:00
dm btree: fix serious bug in btree_split_beneath()
2018-01-23 19:57:08 +01:00
md: free unused memory after bitmap resize
2017-12-16 16:25:47 +01:00
md-cluster: sync bitmap when node received RESYNCING msg
2016-05-04 12:39:35 -07:00
dm bufio: fix deadlock with loop device
2019-08-04 09:33:32 +02:00
dm: move request-based code out to dm-rq.[hc]
2016-06-10 15:15:44 -04:00
dm cache metadata: ignore hints array being too small during resize
2018-10-13 09:18:55 +02:00
dm cache: make sure every metadata function checks fail_io
2016-03-10 17:12:12 -05:00
dm cache: speed up writing of the hint array
2016-09-22 11:15:02 -04:00
dm cache: speed up writing of the hint array
2016-09-22 11:15:02 -04:00
dm cache policy smq: distribute entries to random levels when switching to smq
2016-09-22 11:15:03 -04:00
dm cache: speed up writing of the hint array
2016-09-22 11:15:02 -04:00
dm cache: fix resize crash if user doesn't reload cache table
2018-10-13 09:18:55 +02:00
dm: allocate struct mapped_device with kvzalloc
2017-11-30 08:39:02 +00:00
dm crypt: mark key as invalid until properly loaded
2017-01-06 10:40:15 +01:00
dm delay: fix a crash when invalid device is specified
2019-05-25 18:26:54 +02:00
dm era: save spacemap metadata root after the pre-commit
2017-05-20 14:28:37 +02:00
dm snapshot: fix hung bios when copy error occurs
2016-01-08 20:03:05 -05:00
dm flakey: return -EINVAL on interval bounds error in flakey_ctr()
2017-01-06 10:40:15 +01:00
dm io: fix duplicate bio completion due to missing ref count
2018-03-11 16:21:30 +01:00
dm ioctl: harden copy_params()'s copy_from_user() from malicious users
2018-11-13 11:17:02 -08:00
dm kcopyd: Fix bug causing workqueue stalls
2019-01-26 09:38:35 +01:00
libnvdimm for 4.8
2016-07-28 17:38:16 -07:00
Merge branch 'for-4.9/block' of git://git.kernel.dk/linux-block
2016-10-07 14:42:05 -07:00
dm log: fix unitialized bio operation flags
2016-08-24 21:55:05 -04:00
dm mpath: cleanup -Wbool-operation warning in choose_pgpath()
2017-07-27 15:07:55 -07:00
dm path selector: remove 'repeat_count' return from .select_path hook
2016-02-22 22:34:42 -05:00
dm path selector: remove 'repeat_count' return from .select_path hook
2016-02-22 22:34:42 -05:00
dm raid: fix rebuild of specific devices by updating superblock
2018-10-10 08:53:21 +02:00
dm mirror: use all available legs on multiple failures
2016-10-14 11:55:17 -04:00
block: rename bio bi_rw to bi_opf
2016-08-07 14:41:02 -06:00
dm round robin: revert "use percpu 'repeat_count' and 'current_path'"
2017-03-12 06:41:44 +01:00
dm rq: check blk_mq_register_dev() return value in dm_mq_init_request_queue()
2017-05-20 14:28:37 +02:00
dm rq: introduce dm_mq_kick_requeue_list()
2016-09-15 11:16:05 -04:00
dm path selector: remove 'repeat_count' return from .select_path hook
2016-02-22 22:34:42 -05:00
dm: use bio op accessors
2016-06-07 13:41:38 -06:00
dm snapshot: fix hung bios when copy error occurs
2016-01-08 20:03:05 -05:00
dm snapshot: Fix excessive memory usage and workqueue stalls
2019-01-26 09:38:35 +01:00
dm stats: fix a leaked s->histogram_boundaries array
2017-03-12 06:41:44 +01:00
block: rename bio bi_rw to bi_opf
2016-08-07 14:41:02 -06:00
dm: move request-based code out to dm-rq.[hc]
2016-06-10 15:15:44 -04:00
dm table: an 'all_blk_mq' table must be loaded for a blk-mq DM device
2017-01-06 10:40:15 +01:00
libnvdimm for 4.8
2016-07-28 17:38:16 -07:00
dm thin: fix passdown_double_checking_shared_status()
2019-01-31 08:12:36 +01:00
dm thin: fix passdown_double_checking_shared_status()
2019-01-31 08:12:36 +01:00
dm thin: add sanity checks to thin-pool and external snapshot creation
2019-04-05 22:29:07 +02:00
dm verity fec: fix bufio leaks
2017-04-12 12:41:12 +02:00
dm verity fec: limit error correction recursion
2017-04-12 12:41:12 +02:00
dm verity: use message limit for data block corruption message
2019-07-21 09:06:07 +02:00
block: rename bio bi_rw to bi_opf
2016-08-07 14:41:02 -06:00
dm: correctly handle chained bios in dec_pending()
2018-02-22 15:43:51 +01:00
dm: add infrastructure for DAX support
2016-07-20 23:49:49 -04:00
MD: rename some functions
2016-01-20 13:52:20 -08:00
dm raid: select the Kconfig option CONFIG_MD_RAID0
2017-05-25 15:44:33 +02:00
md/linear: shutup lockdep warnning
2017-10-21 17:21:35 +02:00
md linear: fix a race between linear_add() and linear_congested()
2017-03-12 06:41:52 +01:00
dm: move request-based code out to dm-rq.[hc]
2016-06-10 15:15:44 -04:00
md-cluster: clear another node's suspend_area after the copy is finished
2018-10-03 17:01:43 -07:00
md-cluster: gather resync infos and enable recv_thread after bitmap is ready
2016-05-09 09:24:03 -07:00
md: fix for divide error in status_resync
2019-07-21 09:05:56 +02:00
md: changes for MD_STILL_CLOSED flag
2016-09-21 09:09:44 -07:00
block: rename bio bi_rw to bi_opf
2016-08-07 14:41:02 -06:00
block: rename bio bi_rw to bi_opf
2016-08-07 14:41:02 -06:00
MD: fix invalid stored role for a disk - try2
2018-11-13 11:17:05 -08:00
raid5-cache: correct condition for empty metadata write
2016-10-28 22:04:03 -07:00
md/raid: raid5 preserve the writeback action after the parity check
2019-05-25 18:26:57 +02:00
md/raid5: Convert to hotplug state machine
2016-09-06 18:30:23 +02:00
md: Fix failed allocation of md_register_thread
2019-03-23 13:19:53 +01:00
raid10: improve random reads performance
2016-07-19 15:20:28 -07:00
0d78b27b83