------- Comment From ddstr...@us.ibm.com 2014-09-19 17:10 EDT-------
(In reply to comment #9)
> So in my last run I recreated similar scenario with xmon=on and found that
> the traces are triggered when I suspend and resume my guest when test were
> running and not because of my actual test.
>
> --- Actual steps to reproduce --
> - enable xmon in /etc/default/grub and run 'update-grub' and 'reboot'
> - Run ltpstress test
> - suspend the guest 'virsh suspend <guest>'
> - after few seconds resume. my test running fine
> - dmesg showed the original traces messages as below
This is normal for powerpc, currently.
In the watchdog:
/*
* If a virtual machine is stopped by the host it can look to
* the watchdog like a soft lockup, check to see if the host
* stopped the vm before we issue the warning
*/
if (kvm_check_and_clear_guest_paused())
return HRTIMER_RESTART;
The generic function requires arch support:
/*
* This function is used by architectures that support kvm to avoid issuing
* false soft lockup messages.
*/
static inline bool kvm_check_and_clear_guest_paused(void)
{
return false;
}
But powerpc doesn't currently implement that check:
static inline bool kvm_check_and_clear_guest_paused(void)
{
return false;
}
You can safely ignore all those soft lockup messages, if they occur when
your guest is suspended. As that appears to be the case in this bug,
I'm rejecting it.
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https://bugs.launchpad.net/bugs/1370421
Title:
BUG: soft lockup - CPU#15 stuck for 59737s! [genload:22734]
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