From: Josef Bacik <jba...@fb.com>
If the nbd server stops receiving packets altogether we will get stuck
waiting for them to receive indefinitely as the tcp buffer will never
empty, which looks like a deadlock. Fix this by setting the sk send
timeout to our configured timeout, that way if the server really
misbehaves we'll disconnect cleanly instead of waiting forever.
Reported-by: Dan Melnic <d...@fb.com>
Signed-off-by: Josef Bacik <jba...@fb.com>
---
drivers/block/nbd.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index f3f191b..ac0f7a8 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -910,6 +910,7 @@ static int nbd_reconnect_socket(struct nbd_device *nbd,
unsigned long arg)
continue;
}
sk_set_memalloc(sock->sk);
+ sock->sk->sk_sndtimeo = nbd->tag_set.timeout;
atomic_inc(&config->recv_threads);
refcount_inc(&nbd->config_refs);
old = nsock->sock;
@@ -1071,6 +1072,7 @@ static int nbd_start_device(struct nbd_device *nbd)
return -ENOMEM;
}
sk_set_memalloc(config->socks[i]->sock->sk);
+ config->socks[i]->sock->sk->sk_sndtimeo = nbd->tag_set.timeout;
atomic_inc(&config->recv_threads);
refcount_inc(&nbd->config_refs);
INIT_WORK(&args->work, recv_work);
--
2.7.4
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