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Date:	Sat, 2 Aug 2008 13:45:26 -0600
From:	"Tantilov, Emil S" <>
To:	David Miller <>,
	"" <>
CC:	"Kirsher, Jeffrey T" <>,
	"" <>
Subject: RE: [BUG] NULL pointer dereference in skb_dequeue

Still no luck.

I was able to reset the interfaces and change the MTU multiple times until eventually the system froze. No trace.


-----Original Message-----
From: David Miller []
Sent: Saturday, August 02, 2008 12:23 PM
Cc: Tantilov, Emil S; Kirsher, Jeffrey T;
Subject: Re: [BUG] NULL pointer dereference in skb_dequeue

From: David Miller <>
Date: Sat, 02 Aug 2008 12:18:15 -0700 (PDT)

> See my other emails, it isn't even necessary anyways.

Sorry, because some idiot took part of the conversation private
my follow-on fixup patch didn't make it to the list, here it is.

It goes on top of the original patch I sent out:

diff --git a/net/core/dev.c b/net/core/dev.c
index 69320a5..da7acac 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1796,7 +1796,7 @@ gso:
        skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
        if (q->enqueue) {
-               spinlock_t *root_lock = qdisc_root_lock(q);
+               spinlock_t *root_lock = qdisc_lock(q);


@@ -1995,7 +1995,7 @@ static void net_tx_action(struct softirq_action *h)
                        clear_bit(__QDISC_STATE_SCHED, &q->state);

-                       root_lock = qdisc_root_lock(q);
+                       root_lock = qdisc_lock(q);
                        if (spin_trylock(root_lock)) {
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