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net: ratelimit warnings about dst entry refcount underflow or overflow

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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machines with outdated 3.10.y kernels.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 <khlebnikov@yandex-team.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Konstantin Khlebnikov 2015-07-17 14:01:11 +03:00 committed by David S. Miller
parent b8a23e8d8e
commit 8bf4ada2e2
1 changed files with 3 additions and 1 deletions
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4
net/core/dst.c
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@ -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);
}