linux-kernel - Re: KVM VM shutdown triggers BUG from network bridge code in 3.9.9

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Fri, 5 Jul 2013 08:31:43 +0000 (UTC)
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	netdev@...r.kernel.org
Subject: Re: KVM VM shutdown triggers BUG from network bridge code in 3.9.9

On Fri, 05 Jul 2013 at 04:30 GMT, Robert Hancock <hancockrwd@...il.com> wrote:
> I've run into a problem after updating to Fedora 19 where if I shut down 
> a Windows 7 KVM virtual machine, the machine hits a kernel panic. There 
> are a few reports of this on 3.9.8 and 3.9.9 kernels here:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=981437
>
> The panic is "kernel BUG at kernel/timer.c:729!" and the stack traces 
> all seem basically the same, something like this one (captured with kdump):
>
>   #7 [ffff880214d25c10] mod_timer+501 at ffffffff8106d905
>   #8 [ffff880214d25c50] br_multicast_del_pg.isra.20+261 at 
> ffffffffa0731d25 [bridge]

Yeah, I got some similar bug report on Fedora...

Could you try the following patch? Thanks!

----------

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 81befac..69af490 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -270,7 +270,7 @@ static void br_multicast_del_pg(struct net_bridge *br,
 		del_timer(&p->timer);
 		call_rcu_bh(&p->rcu, br_multicast_free_pg);
 
-		if (!mp->ports && !mp->mglist &&
+		if (!mp->ports && !mp->mglist && mp->timer_armed &&
 		    netif_running(br->dev))
 			mod_timer(&mp->timer, jiffies);
 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/