linux-ext4 - [PATCH] workingset: add missing rcu_read_unlock() in lru_gen

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Date:   Wed, 10 May 2023 07:22:55 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     syzbot <syzbot+3c6cac1550288f8e7060@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Nhat Pham <nphamcs@...il.com>
Cc:     linux-mm <linux-mm@...ck.org>
Subject: [PATCH] workingset: add missing rcu_read_unlock() in
 lru_gen_refault()

syzbot is reporting sleep in RCU context, for commit d66c718d28ac
("workingset: refactor LRU refault to expose refault recency check")
missed rcu_read_unlock().

Reported-by: syzbot <syzbot+3c6cac1550288f8e7060@...kaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=3c6cac1550288f8e7060
Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Fixes: d66c718d28ac ("workingset: refactor LRU refault to expose refault recency check")
---
 mm/workingset.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/workingset.c b/mm/workingset.c
index d81f9dafc9f1..90ae785d4c9c 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -303,7 +303,7 @@ static void lru_gen_refault(struct folio *folio, void *shadow)
 		goto unlock;
 
 	if (pgdat != folio_pgdat(folio))
-		return;
+		goto unlock;
 
 	lruvec = mem_cgroup_lruvec(memcg, pgdat);
 	lrugen = &lruvec->lrugen;
-- 
2.18.4