Re: [patch, -rc5-mm1] lock validator: special locking: net/ipv4/igmp.c #2

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On 5/31/06, Ingo Molnar <[email protected]> wrote:

* Jesse Brandeburg <[email protected]> wrote:

> well, when running e1000 through some code paths on FC4 +
> 2.6.17-rc5-mm1 + ingo's latest rollup patch, with this lockdep debug
> option enabled I got this:
>
> e1000: eth1: e1000_watchdog_task: NIC Link is Up 1000 Mbps Full Duplex
>
> ======================================
> [ BUG: bad unlock ordering detected! ]
> --------------------------------------
> mDNSResponder/2361 is trying to release lock (&in_dev->mc_list_lock) at:
> [<ffffffff81233f5a>] ip_mc_add_src+0x85/0x1f8

ok, could you try the patch below? (i also updated the rollup with this
fix)

        Ingo

---------------------
Subject: lock validator: special locking: net/ipv4/igmp.c #2
From: Ingo Molnar <[email protected]>

another case of non-nested unlocking igmp.c.

Signed-off-by: Ingo Molnar <[email protected]>
---
 net/ipv4/igmp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/net/ipv4/igmp.c
===================================================================
--- linux.orig/net/ipv4/igmp.c
+++ linux/net/ipv4/igmp.c
@@ -1646,7 +1646,7 @@ static int ip_mc_add_src(struct in_devic
                return -ESRCH;
        }
        spin_lock_bh(&pmc->lock);
-       read_unlock(&in_dev->mc_list_lock);
+       read_unlock_non_nested(&in_dev->mc_list_lock);

 #ifdef CONFIG_IP_MULTICAST
        sf_markstate(pmc);


yep, this fixes it.
-
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