Guoju Fang e6ede97e26 bcache: fix a lost wake-up problem caused by mca_cannibalize_lock ...

[ Upstream commit 34cf78bf34 ]

This patch fix a lost wake-up problem caused by the race between
mca_cannibalize_lock and bch_cannibalize_unlock.

Consider two processes, A and B. Process A is executing
mca_cannibalize_lock, while process B takes c->btree_cache_alloc_lock
and is executing bch_cannibalize_unlock. The problem happens that after
process A executes cmpxchg and will execute prepare_to_wait. In this
timeslice process B executes wake_up, but after that process A executes
prepare_to_wait and set the state to TASK_INTERRUPTIBLE. Then process A
goes to sleep but no one will wake up it. This problem may cause bcache
device to dead.

Signed-off-by: Guoju Fang <fangguoju@gmail.com>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2023-05-16 09:15:02 +09:00

..

alloc.c

bcache: avoid clang -Wunintialized warning

2023-05-15 13:34:07 +09:00

bcache.h

bcache: fix a lost wake-up problem caused by mca_cannibalize_lock

2023-05-16 09:15:02 +09:00

bset.c

bcache: allocate meta data pages as compound pages

2023-05-16 08:48:03 +09:00

bset.h

bcache: explicity type cast in bset_bkey_last()

2023-05-15 16:59:51 +09:00

btree.c

bcache: fix a lost wake-up problem caused by mca_cannibalize_lock

2023-05-16 09:15:02 +09:00

btree.h

bcache: Make gc wakeup sane, remove set_task_state()

2017-02-23 17:44:36 +01:00

closure.c

bcache: update document info

2016-07-05 11:34:49 -06:00

closure.h

bcache: update document info

2016-07-05 11:34:49 -06:00

debug.c

block: export bio_free_pages to other modules

2016-09-22 07:48:03 -06:00

debug.h

bcache: Convert debug code to btree_keys

2014-01-08 13:05:13 -08:00

extents.c

bcache: Fix building error on MIPS

2017-12-05 11:24:34 +01:00

extents.h

bcache: Fix a journal replay bug

2014-08-04 15:23:02 -07:00

io.c

block: simplify and cleanup bvec pool handling

2016-07-20 17:37:02 -06:00

journal.c

bcache: allocate meta data pages as compound pages

2023-05-16 08:48:03 +09:00

journal.h

bcache: Fix a shutdown bug

2014-02-25 18:42:49 -08:00

Kconfig

bcache: Kill dead cgroup code

2014-03-18 12:22:35 -07:00

Makefile

bcache: Abstract out stuff needed for sorting

2014-01-08 13:05:12 -08:00

movinggc.c

block: export bio_free_pages to other modules

2016-09-22 07:48:03 -06:00

request.c

bcache: fix kcrashes with fio in RAID5 backend dev

2018-05-30 07:50:32 +02:00

request.h

bcache: Kill dead cgroup code

2014-03-18 12:22:35 -07:00

stats.c

bcache: Kill dead cgroup code

2014-03-18 12:22:35 -07:00

stats.h

bcache: Break up struct search

2013-11-10 21:56:32 -08:00

super.c

bcache: fix a lost wake-up problem caused by mca_cannibalize_lock

2023-05-16 09:15:02 +09:00

sysfs.c

bcache: fix input overflow to sequential_cutoff

2023-05-15 12:17:13 +09:00

sysfs.h

bcache: improve sysfs_strtoul_clamp()

2023-05-15 12:17:13 +09:00

trace.c

bcache: Better alloc tracepoints

2014-03-18 12:22:35 -07:00

util.c

bcache: fix bch_hprint crash and improve output

2017-09-27 14:39:25 +02:00

util.h

bcache: remove driver private bio splitting code

2015-08-13 12:31:40 -06:00

writeback.c

bcache: release dc->writeback_lock properly in bch_writeback_thread()

2023-05-12 17:24:49 +09:00

writeback.h

bcache: never writeback a discard operation

2023-05-15 12:06:36 +09:00