Guoju Fang fd3572bd5b 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>		2020-10-01 13:17:18 +02:00
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Kconfig	…
Makefile	…
alloc.c	…
bcache.h	bcache: fix a lost wake-up problem caused by mca_cannibalize_lock	2020-10-01 13:17:18 +02:00
bset.c	…
bset.h	…
btree.c	bcache: fix a lost wake-up problem caused by mca_cannibalize_lock	2020-10-01 13:17:18 +02:00
btree.h	…
closure.c	…
closure.h	…
debug.c	…
debug.h	…
extents.c	…
extents.h	…
io.c	…
journal.c	…
journal.h	…
movinggc.c	…
request.c	…
request.h	…
stats.c	…
stats.h	…
super.c	bcache: fix a lost wake-up problem caused by mca_cannibalize_lock	2020-10-01 13:17:18 +02:00
sysfs.c	…
sysfs.h	…
trace.c	…
util.c	…
util.h	…
writeback.c	bcache: fix overflow in offset_to_stripe()	2020-08-21 13:05:25 +02:00
writeback.h	bcache: fix overflow in offset_to_stripe()	2020-08-21 13:05:25 +02:00