From: Arjan van de Ven <[email protected]>
> Linux version 2.6.17-git22 (duncan@baldrick) (gcc version 4.0.3 (Ubuntu 4.0.3-1ubuntu5)) #20 PREEMPT Tue Jul 4 10:35:04 CEST 2006
>
> [ 2381.598609] =============================================
> [ 2381.619314] [ INFO: possible recursive locking detected ]
> [ 2381.635497] ---------------------------------------------
> [ 2381.651706] atmarpd/2696 is trying to acquire lock:
> [ 2381.666354] (&skb_queue_lock_key){-+..}, at: [<c028c540>] skb_migrate+0x24/0x6c
> [ 2381.688848]
ok this is a real potential deadlock in a way, it takes two locks of 2
skbuffs without doing any kind of lock ordering; I think the following
patch should fix it. Just sort the lock taking order by address of the
skb.. it's not pretty but it's the best this can do in a minimally
invasive way.
I still agree with the comment that this code shouldn't live in the atm
layer...
Signed-off-by: Arjan van de Ven <[email protected]>
---
net/atm/ipcommon.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
Index: linux-2.6.17-mm6/net/atm/ipcommon.c
===================================================================
--- linux-2.6.17-mm6.orig/net/atm/ipcommon.c
+++ linux-2.6.17-mm6/net/atm/ipcommon.c
@@ -25,8 +25,8 @@
/*
* skb_migrate appends the list at "from" to "to", emptying "from" in the
* process. skb_migrate is atomic with respect to all other skb operations on
- * "from" and "to". Note that it locks both lists at the same time, so beware
- * of potential deadlocks.
+ * "from" and "to". Note that it locks both lists at the same time, so to deal
+ * with the lock ordering, the locks are taken in address order.
*
* This function should live in skbuff.c or skbuff.h.
*/
@@ -39,8 +39,13 @@ void skb_migrate(struct sk_buff_head *fr
struct sk_buff *skb_to = (struct sk_buff *) to;
struct sk_buff *prev;
- spin_lock_irqsave(&from->lock,flags);
- spin_lock(&to->lock);
+ if (from<to) {
+ spin_lock_irqsave(&from->lock,flags);
+ spin_lock_nested(&to->lock, SINGLE_DEPTH_NESTING);
+ } else {
+ spin_lock_irqsave(&to->lock, flags);
+ spin_lock_nested(&from->lock, SINGLE_DEPTH_NESTING);
+ }
prev = from->prev;
from->next->prev = to->prev;
prev->next = skb_to;
-
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