Re: [Xen-devel] xen problem with save/restore

[Paul Larson <plars@xxxxxxxxxxxxxxxxxxxx>]

Interesting, I'm using this on a different machine now and getting a
slightly different error when I restore:
Unable to handle kernel NULL pointer dereference at virtual address
00000007
 printing eip:
c0302407
*pde = ma 00000000 pa 55555000
 [<c012bbee>] worker_thread+0x1ea/0x2e0

The new machine is my laptop, an IBM T41p, but otherwise much the same
(debian sarge, same compiler, etc).

Thanks,
Paul Larson
On Fri, 2004-12-03 at 10:58, Paul Larson wrote:
> I think I've seen something similar to this posted recently, but I can't
> find the message to reply to.  I build xen-2.0-testing from source
> yesterday.  I have debian sarge running on all my domains right now.  I
> was trying the save/restore feature out, and got this after restoring
> and consoling into a session:
> 
> ************ REMOTE CONSOLE: CTRL-] TO QUIT ********
> Unable to handle kernel NULL pointer dereference at virtual address
> 00000007
>  printing eip:
> c030e587
> *pde = ma 00000000 pa 55555000
>  [<c0109f80>] __do_suspend+0x19f/0x1e0
> 
>  [<c012ca65>] worker_thread+0x22b/0x32f
> 
>  [<c010a088>] __shutdown_handler+0x0/0x48
> 
>  [<c01196c0>] default_wake_function+0x0/0x12
> 
>  [<c01196c0>] default_wake_function+0x0/0x12
> 
>  [<c012c83a>] worker_thread+0x0/0x32f
> 
>  [<c0130b89>] kthread+0xa5/0xab
> 
>  [<c0130ae4>] kthread+0x0/0xab
> 
>  [<c010f411>] kernel_thread_helper+0x5/0xb
> 
> Oops: 0002 [#1]
> PREEMPT DEBUG_PAGEALLOC
> Modules linked in:
> CPU:    0
> EIP:    0061:[<c030e587>]    Not tainted VLI
> EFLAGS: 00010203   (2.6.9-xenU)
> EIP is at init_tsc+0x4b/0x9e
> eax: c02c6dd4   ebx: 0000c000   ecx: fbffc000   edx: 00000001
> esi: 00000010   edi: c0102000   ebp: 00000000   esp: c0039f04
> ds: 007b   es: 007b   ss: 0069
> Process events/0 (pid: 3, threadinfo=c0038000 task=c003cac0)
> Stack: c010eadd 00000000 c0109f80 fbffc000 000001e1 00000063 8ed0dd7b
> 00000042
>        c02c3200 c2dc5000 c02c5d80 00000000 c0038000 00000000 c012ca65
> 00000000
>        c0039f74 00000000 c003bf10 c0038000 c0038000 c0038000 c010a088
> c0038000
> Call Trace:
>  [<c010eadd>] time_resume+0x12/0x51
> 
>  [<c0109f80>] __do_suspend+0x19f/0x1e0
> 
>  [<c012ca65>] worker_thread+0x22b/0x32f
> 
>  [<c010a088>] __shutdown_handler+0x0/0x48
> 
>  [<c01196c0>] default_wake_function+0x0/0x12
> 
>  [<c01196c0>] default_wake_function+0x0/0x12
> 
>  [<c012c83a>] worker_thread+0x0/0x32f
> 
>  [<c0130b89>] kthread+0xa5/0xab
> 
>  [<c0130ae4>] kthread+0x0/0xab
> 
>  [<c010f411>] kernel_thread_helper+0x5/0xb
> 
> Code: 00 00 00 00 00 00 00 00 70 0d 5a f6 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80 21 00 00 00 00 00 <00> 4e
> f7 ac 41 c8 a8 af 41 61 21 4c 41 00 00 00 00 00 00 01 00
> 
> I'm just starting to play with xen, so I haven't figured out much of the
> debugging stuff yet.  If someone can point me in the right direction
> though, I'd be happy to try to collect some more data if there's
> anything that would be useful.
> 
> Thanks,
> Paul Larson
> 
> 
> 
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