netdev - Re: bad unlock balance detected during stress

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Date:	Wed, 03 Feb 2010 14:49:15 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	emil.s.tantilov@...el.com
Cc:	netdev@...r.kernel.org, paulmck@...ux.vnet.ibm.com
Subject: Re: bad unlock balance detected during stress

From: "Tantilov, Emil S" <emil.s.tantilov@...el.com>
Date: Wed, 3 Feb 2010 13:05:44 -0700

> I got this panic while running netperf stress test using recent pull from net-next:

Known bug, fixed yesterday by Patrick McHardy:

commit d1c9ae6d1e7b95cedc8e39e8949e795379a0669e
Author: Patrick McHardy <kaber@...sh.net>
Date:   Tue Feb 2 11:46:50 2010 -0800

    ipv4: ip_fragment: fix unbalanced rcu_read_unlock()
    
    Signed-off-by: Patrick McHardy <kaber@...sh.net>
    Signed-off-by: David S. Miller <davem@...emloft.net>

diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 9f41bd3..b59430b 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -234,10 +234,9 @@ static void ip_expire(unsigned long arg)
 
 		/* Send an ICMP "Fragment Reassembly Timeout" message. */
 		icmp_send(head, ICMP_TIME_EXCEEDED, ICMP_EXC_FRAGTIME, 0);
-	}
-
 out_rcu_unlock:
-	rcu_read_unlock();
+		rcu_read_unlock();
+	}
 out:
 	spin_unlock(&qp->q.lock);
 	ipq_put(qp);
--
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