In bch_cached_dev_attach(), writeback kthread stopped if
bch_cached_dev_run() returns error. Then, cached_dev_free()
will stop writeback kthread again and crash.
This patch set dc->writeback_thread to null after call kthread_stop().
Fixes: 5c2a634cbfaf ("bcache: stop writeback kthread and kworker when bch_cached_dev_run() failed")
Signed-off-by: Mingzhe Zou <mingzhe.zou@xxxxxxxxxxxx>
---
drivers/md/bcache/super.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index ba3909bb6bea..7b6e533b0339 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1310,6 +1310,7 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
* have to be stopped manually here.
*/
kthread_stop(dc->writeback_thread);
+ dc->writeback_thread = NULL;
cancel_writeback_rate_update_dwork(dc);
pr_err("Couldn't run cached device %pg\n", dc->bdev);
return ret;
--
2.17.1.windows.2
