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SeongJae Park 6376a82459 mm/damon/core: make damon_start() waits until kdamond_fn() starts

The cleanup tasks of kdamond threads including reset of corresponding
DAMON context's ->kdamond field and decrease of global nr_running_ctxs
counter is supposed to be executed by kdamond_fn().  However, commit
0f91d13366a4 ("mm/damon: simplify stop mechanism") made neither
damon_start() nor damon_stop() ensure the corresponding kdamond has
started the execution of kdamond_fn().

As a result, the cleanup can be skipped if damon_stop() is called fast
enough after the previous damon_start().  Especially the skipped reset
of ->kdamond could cause a use-after-free.

Fix it by waiting for start of kdamond_fn() execution from
damon_start().

Link: https://lkml.kernel.org/r/20231208175018.63880-1-sj@kernel.org
Fixes: 0f91d13366a4 ("mm/damon: simplify stop mechanism")
Signed-off-by: SeongJae Park <sj@kernel.org>
Reported-by: Jakub Acs <acsjakub@amazon.de>
Cc: Changbin Du <changbin.du@intel.com>
Cc: Jakub Acs <acsjakub@amazon.de>
Cc: <stable@vger.kernel.org> # 5.15.x
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

2023-12-12 17:20:17 -08:00

core-test.h

mm/damon/core-test: fix memory leak in damon_new_ctx()

2023-10-04 10:32:32 -07:00

core.c

mm/damon/core: make damon_start() waits until kdamond_fn() starts

2023-12-12 17:20:17 -08:00

dbgfs-test.h

mm/damon/dbgfs-test: fix is_target_id() change

2022-03-22 15:57:12 -07:00

dbgfs.c

mm/damon/core: implement scheme-specific apply interval