From 012bb6bf5c965547bd647b70169d4f834a924dcf Mon Sep 17 00:00:00 2001 From: Konstantin Khlebnikov Date: Fri, 17 Jul 2015 14:01:11 +0300 Subject: [PATCH] net: ratelimit warnings about dst entry refcount underflow or overflow Kernel generates a lot of warnings when dst entry reference counter overflows and becomes negative. That bug was seen several times at machines with outdated 3.10.y kernels. Most like it's already fixed in upstream. Anyway that flood completely kills machine and makes further debugging impossible. Signed-off-by: Konstantin Khlebnikov Signed-off-by: David S. Miller --- net/core/dst.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/core/dst.c b/net/core/dst.c index e956ce6d13782..002144bea9351 100644 --- a/net/core/dst.c +++ b/net/core/dst.c @@ -284,7 +284,9 @@ void dst_release(struct dst_entry *dst) int newrefcnt; newrefcnt = atomic_dec_return(&dst->__refcnt); - WARN_ON(newrefcnt < 0); + if (unlikely(newrefcnt < 0)) + net_warn_ratelimited("%s: dst:%p refcnt:%d\n", + __func__, dst, newrefcnt); if (unlikely(dst->flags & DST_NOCACHE) && !newrefcnt) call_rcu(&dst->rcu_head, dst_destroy_rcu); } -- 2.39.5