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| author | Konstantin Khlebnikov <khlebnikov@yandex-team.ru> | 2015-07-17 14:01:11 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-07-21 00:11:19 -0700 |
| commit | 8bf4ada2e21378816b28205427ee6b0e1ca4c5f1 (patch) | |
| tree | d0422c066f7e392f4fcbee512a2662cc4955f7da /net | |
| parent | b8a23e8d8e31abeda2f6cfa36a772414b2a86ffc (diff) | |
| download | linux-8bf4ada2e21378816b28205427ee6b0e1ca4c5f1.tar.gz linux-8bf4ada2e21378816b28205427ee6b0e1ca4c5f1.tar.bz2 linux-8bf4ada2e21378816b28205427ee6b0e1ca4c5f1.zip | |
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machines with outdated 3.10.y kernels.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 <khlebnikov@yandex-team.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/dst.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/core/dst.c b/net/core/dst.c index e956ce6d1378..002144bea935 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); } |