Re: iptables causing kernel panic - part II

[Matt Ayres <matta@tektonic.net>]

Keir Fraser wrote:
> 
> On 15 May 2006, at 16:35, Matt Ayres wrote:
> 
>> Here is my trace, I was not able to get the Code line unfortunately so 
>> I don't have specific line numbers.  I'd like re-confirmation this is 
>> not specific to Xen. If it is not I will be sending this over to LKML.
> 
> There are no Xen-specific functions in the backtrace. This doesn't mean 
> it isn't a Xen bug (since we make various pervasive functions that are 
> used all over the place) but it does make it less likely. Certainly 
> there's nothing in the backtrace that we can use to track down the bug. 
> We would need a line number, or a kernel image or something like that.
> 

I'll try to get the Code line next time.  Is there a more preferred 
method than using ksymoops? It seems ksymoops is depreciated as a 
/proc/ksyms doesn't even exist on my system and Fedora has stopped 
shipping RPM's for it.  I do have the vmlinux file and System.map if 
that would help.

Sometimes the panic includes xen_idle, ex:

EIP is at ipt_do_table+0xad/0x2d0
eax: 00000002   ebx: cadc221e   ecx: cadc221e   edx: 00000000
esi: d13f6000   edi: 00004000   ebp: d13f9c20   esp: c0525dd0
ds: 007b   es: 007b   ss: 0069
Process swapper (pid: 0, threadinfo=c0524000 task=c04a8c00)
Stack: <0>c04dc0ac 00000000 cadc221e 00000000 c83a1000 cfd60000 d13f6000 
00000000
       00000001 00000000 c0525e70 80000000 c03aeca8 cfd60000 c03e1e18 
c0525eb4
       00000002 c83a1000 cfd60000 c04dc080 00000000 c03a4420 00000002 
c0525eb4
Call Trace:
[<c03aeca8>] ip_forward_finish+0x0/0x36
[<c03e1e18>] ipt_hook+0x1c/0x20
[<c03a4420>] nf_iterate+0x2c/0x5e
[<c03aeca8>] ip_forward_finish+0x0/0x36
[<c03aeca8>] ip_forward_finish+0x0/0x36
PORT HISTORY> next
[<c03a451b>] nf_hook_slow+0x3c/0xc3
[<c03aeca8>] ip_forward_finish+0x0/0x36
[<c03aee7c>] ip_forward+0x19e/0x22e
[<c03aeca8>] ip_forward_finish+0x0/0x36
[<c03add9b>] ip_rcv+0x40e/0x48f
[<c037f289>] netif_receive_skb+0x2b9/0x2f7
[<c037f382>] process_backlog+0xbb/0x14b
[<c037d2ee>] net_rx_action+0xaa/0x17c
[<c011ea03>] __do_softirq+0x73/0xf0
[<c011eac0>] do_softirq+0x40/0x64
[<c010606b>] do_IRQ+0x1f/0x25
[<c02fdfa4>] evtchn_do_upcall+0x60/0x96
[<c0104a2c>] hypervisor_callback+0x2c/0x34
[<c010342e>] xen_idle+0x5e/0x7d
[<c0103509>] cpu_idle+0xbc/0xd5
[<c05264e0>] start_kernel+0x344/0x34b
Code: 89 44 24 18 89 c6 8b 44 24 40 8b 6c 24 18 03 74 83 0c 03 6c 83 20 
c7 44 24 0c 00 00 00 00 0f b7 54 24 06 8b 5c 24 08 89 54 24 1c <8a> 4e 
53 88 4c 24 23 8b 46 08 0f b6 c9 23 43 0c 3b 06 89 c8 0f
<0>Kernel panic - not syncing: Fatal exception in interrupt
(XEN) Domain 0 crashed: rebooting machine in 5 seconds.

I have the Code line for this, but unfortunately I do not have the 
System.map that corresponds to this particular kernel.