Re: port-xen/55291: panic: HYPERVISOR_mmu_update failed, ret: -16

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Sat, May 23, 2020 at 03:25:01PM +0000, prlw1%cam.ac.uk@localhost wrote:
> Starting cupsd.
> Starting cron.
> The following components reported failures:
>     /etc/rc.d/sysctl
> See /var/run/rc.log for more information.
> Sat May 23 16:11:29 BST 2020
> [ 239.1600116] xpq_flush_queue: 1 entries (0 successful) on cpu0 (0)
> [ 239.1600116] panic: HYPERVISOR_mmu_update failed, ret: -16
> 
> [ 239.1600116] cpu0: Begin traceback...
> [ 239.1600116] vpanic() at netbsd:vpanic+0x146
> [ 239.1600116] snprintf() at netbsd:snprintf
> [ 239.1600116] xpq_queue_machphys_update() at netbsd:xpq_queue_machphys_update
> [ 239.1600116] pmap_enter_ma() at netbsd:pmap_enter_ma+0x69d
> [ 239.1600116] pmap_enter() at netbsd:pmap_enter+0x58
> [ 239.1600116] udv_fault() at netbsd:udv_fault+0x100
> [ 239.1600116] uvm_fault_internal() at netbsd:uvm_fault_internal+0x518
> [ 239.1600116] trap() at netbsd:trap+0x66c
> [ 239.1600116] --- trap (number 6) ---
> [ 239.1600116] 7237b698b62f:
> [ 239.1600116] cpu0: End traceback...
> 
> [ 239.1600116] dumping to dev 168,1 (offset=33554431, size=0): not possible
> [ 239.1600116] rebooting...
> (XEN) Hardware Dom0 shutdown: rebooting machine
> (XEN) Resetting with ACPI MEMORY or I/O RESET_REG.
> 
> >How-To-Repeat:
> Boot XEN3_DOM0

We'll need more details, because I don't get this problem.
Do you have a serial console ?
Is it with a xen-debug.gz kernel ?

are you doing anything special, e.g. start X11, when it panics ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--