On Thu, 2015-08-13 at 13:19 -0700, Eric Dumazet wrote:

> 
> A caller handler can not call del_timer_sync()

A timer handler can not call del_timer_sync()

I am testing a minimal fix :

diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 05e3145f7dc3..134957159c27 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -593,7 +593,7 @@ static bool reqsk_queue_unlink(struct request_sock_queue 
*queue,
        }
 
        spin_unlock(&queue->syn_wait_lock);
-       if (del_timer_sync(&req->rsk_timer))
+       if (timer_pending(&req->rsk_timer) && del_timer_sync(&req->rsk_timer))
                reqsk_put(req);
        return found;
 }


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