On 18/07/2019 15:48, Juergen Gross wrote:
> On 15.07.19 16:08, Sergey Dyasli wrote:
>> On 05/07/2019 14:56, Dario Faggioli wrote:
>>> On Fri, 2019-07-05 at 14:17 +0100, Sergey Dyasli wrote:
>>>> 1) This crash is quite likely to happen:
>>>>
>>>> [2019-07-04 18:22:46 UTC] (XEN) [ 3425.220660] Watchdog timer detects
>>>> that CPU2 is stuck!
>>>> [2019-07-04 18:22:46 UTC] (XEN) [ 3425.226293] ----[ Xen-4.13.0-
>>>> 8.0.6-d x86_64 debug=y Not tainted ]----
>>>> [...]
>>>> [2019-07-04 18:22:47 UTC] (XEN) [ 3425.501989] Xen call trace:
>>>> [2019-07-04 18:22:47 UTC] (XEN) [
>>>> 3425.505278] [<ffff82d08023d578>] vcpu_sleep_sync+0x50/0x71
>>>> [2019-07-04 18:22:47 UTC] (XEN) [
>>>> 3425.511518] [<ffff82d080208370>] vcpu_pause+0x21/0x23
>>>> [2019-07-04 18:22:47 UTC] (XEN) [
>>>> 3425.517326] [<ffff82d08023e25d>]
>>>> vcpu_set_periodic_timer+0x27/0x73
>>>> [2019-07-04 18:22:47 UTC] (XEN) [
>>>> 3425.524258] [<ffff82d080209682>] do_vcpu_op+0x2c9/0x668
>>>> [2019-07-04 18:22:47 UTC] (XEN) [
>>>> 3425.530238] [<ffff82d08024f970>] compat_vcpu_op+0x250/0x390
>>>> [2019-07-04 18:22:47 UTC] (XEN) [
>>>> 3425.536566] [<ffff82d080383964>] pv_hypercall+0x364/0x564
>>>> [2019-07-04 18:22:47 UTC] (XEN) [
>>>> 3425.542719] [<ffff82d080385644>] do_entry_int82+0x26/0x2d
>>>> [2019-07-04 18:22:47 UTC] (XEN) [
>>>> 3425.548876] [<ffff82d08038839b>] entry_int82+0xbb/0xc0
>>>>
>>> Mmm... vcpu_set_periodic_timer?
>>>
>>> What kernel is this and when does this crash happen?
>>
>> Hi Dario,
>>
>> I can easily reproduce this crash using a Debian 7 PV VM (2 vCPUs, 2GB RAM)
>> which has the following kernel:
>>
>> # uname -a
>>
>> Linux localhost 3.2.0-4-amd64 #1 SMP Debian 3.2.78-1 x86_64 GNU/Linux
>>
>> All I need to do is suspend and resume the VM.
>
> Happens with a more recent kernel, too.
>
> I can easily reproduce the issue with any PV guest with more than 1 vcpu
> by doing "xl save" and then "xl restore" again.
>
> With the reproducer being available I'm now diving into the issue...
One further thing to add is that I was able to avoid the crash by reverting
xen/sched: rework and rename vcpu_force_reschedule()
which is a part of the series. This made all tests with PV guests pass.
Another question I have is do you have a git branch with core-scheduling
patches rebased on top of current staging available somewhere?
Thanks,
Sergey
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