Re: [2.6.7-bk] NFS-related kernel panic

[Chris Wright <chrisw@osdl.org>]

* Bob Gill (gillb4@telusplanet.net) wrote:
> Ok.  I get (a very similar) error with 2.6.7-bk4.
> The error message I get is:
> Starting portmapper:                            [OK]
> Starting NFS statd: Kernel panic: Aiee, killing interrupt handler!
> bad: scheduling while atomic!
>  [<c02a2c37>] schedule+0x483/0x488
>  [<c0133298>] __get_free_pages+0x33/0x3f
>  [<c026974c>] tcp_poll+0x34/0x15a
>  [<c02a30b5>] schedule_timeout+0xb5/0xb7
>  [<c0248fb3>] sock_poll+0x29/0x31
>  [<c015da2e>] do_pollfd+0x4f/0x90
>  [<c015db10>] do_poll+0xa1/0xc0
>  [<c016dc7e>] sys_poll+0x14f/0x211
>  [<c015d09d>] __pollwait+0x0/0xc6
>  [<c014afd2>] sys_close+0x63/0x96
>  [<c0103eb1>] sysenter_past_esp+0x52/0x71
> In interrupt handler - not syncing

The lockless loopback transmission patch mucks up the preempt count.
Can you give this patch a try?

thanks,
-chris
-- 
Linux Security Modules     http://lsm.immunix.org     http://lsm.bkbits.net

===== loopback.c 1.15 vs edited =====
--- 1.15/drivers/net/loopback.c	2004-06-20 17:35:52 -07:00
+++ edited/loopback.c	2004-06-21 20:23:06 -07:00
@@ -143,10 +143,11 @@
 
 	dev->last_rx = jiffies;
 	if (likely(loopback_stats)) {
-		get_cpu_ptr(loopback_stats)->rx_bytes += skb->len;
-		get_cpu_ptr(loopback_stats)->tx_bytes += skb->len;
-		get_cpu_ptr(loopback_stats)->rx_packets++;
-		get_cpu_ptr(loopback_stats)->tx_packets++;
+		struct net_device_stats *stats = get_cpu_ptr(loopback_stats);
+		stats->rx_bytes += skb->len;
+		stats->tx_bytes += skb->len;
+		stats->rx_packets++;
+		stats->tx_packets++;
 		put_cpu_ptr(loopback_stats);
 	}