Re: [Xen-users] Report of "soft lockup" for a domU when paused and unpaused

[Tim Post <tim.post@xxxxxxxxxxxxxxx>]

I've gotten that on my Desktop (which currently runs xen 3.0.2)

Dom-0 is my desktop, KDE/Gnome with no dom0_maxmem set, I just let it
balloon as I bring up guests.

My lab VM's are file backed VBD's also (including swap). I see those
messages a few times a week but have yet to pin anything of any kind of
serious consequence on them. I've just been logging when I see them and
ignoring the messages otherwise. 

Since this doesn't happen on a similar machine using partition backed
VBD's for swap, my guess is it has something to do with the host having
to write to a few dom-u file systems as they're swapping too, when all
use loops it happens.

Anyone else shed some light on why? I'm not really concerned about it,
but I'd love to be able to explain it.

Best,
-Tim

On Thu, 2006-10-19 at 01:12 +0100, john maclean wrote:
> This is a message from within the domU "etch_play", based on Debian
> Etch. I have a number of foo_play templates that I experiment with.
> 
> It is a file-based image filled with packages using Debian's
> debootstrap. The domU was idling away not doing anything at all and I
> ran `xm pause <domu id>` and unpaused it after five minutes or so. I'd
> love to learn *myself* how to trace/debug this error but in the
> meantime can any one tell me if this unusual or serious? Let me know
> if there's any more info required as I'd rather not flood this list
> with over enthusiastic data.
> 
> etch_play:~# BUG: soft lockup detected on CPU#0!
> 
> Pid: 0, comm:              swapper
> EIP: 0061:[<c01013a7>] CPU: 0
> EIP is at 0xc01013a7
>   EFLAGS: 00000246    Tainted: GF      (2.6.16-xen #1)
>   EAX: 00000000 EBX: 00000001 ECX: 00000000 EDX: 00000001
>   ESI: 00000000 EDI: c03c0000 EBP: 00000000 DS: 007b ES: 007b
>  CR0: 8005003b CR2: b7f73ef0 CR3: 003e4000 CR4: 00000640
>  [<c010301a>] xen_idle+0x4a/0xb0
>  [<c03c2260>] unknown_bootoption+0x0/0x280
>  [<c03c2260>] unknown_bootoption+0x0/0x280
>  [<c0103194>] cpu_idle+0x74/0xf0
>  [<c03c2260>] unknown_bootoption+0x0/0x280
>  [<c03c2808>] start_kernel+0x328/0x3e0
>  [<c03c2260>] unknown_bootoption+0x0/0x280
> 
> 


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