This is a note to let you know that I've just added the patch titled
sock_map: Add a cond_resched() in sock_hash_free()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sock_map-add-a-cond_resched-in-sock_hash_free.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7c5417d5afceaef06c648396611c6f55d3ca599b
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Fri Sep 6 15:44:49 2024 +0000
sock_map: Add a cond_resched() in sock_hash_free()
[ Upstream commit b1339be951ad31947ae19bc25cb08769bf255100 ]
Several syzbot soft lockup reports all have in common sock_hash_free()
If a map with a large number of buckets is destroyed, we need to yield
the cpu when needed.
Fixes: 75e68e5bf2c7 ("bpf, sockhash: Synchronize delete from bucket list on map free")
Reported-by: syzbot <syzkaller@xxxxxxxxxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Acked-by: Martin KaFai Lau <martin.lau@xxxxxxxxxx>
Acked-by: John Fastabend <john.fastabend@xxxxxxxxx>
Link: https://lore.kernel.org/bpf/20240906154449.3742932-1-edumazet@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/core/sock_map.c b/net/core/sock_map.c
index 0f9648c6bcf76..9ef58dd1139d3 100644
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -1177,6 +1177,7 @@ static void sock_hash_free(struct bpf_map *map)
sock_put(elem->sk);
sock_hash_free_elem(htab, elem);
}
+ cond_resched();
}
/* wait for psock readers accessing its map link */
