Re: handle_pio looping during domain shutdown, with qemu 4.2.0 in stubdom

["Marek Marczykowski-Górecki" <marmarek@invisiblethingslab.com>]

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On Fri, Jun 05, 2020 at 11:22:46AM +0200, Jan Beulich wrote:
> On 05.06.2020 11:09, Jan Beulich wrote:
> > On 04.06.2020 16:25, Marek Marczykowski-Górecki wrote:
> >> (XEN) hvm.c:1620:d6v0 All CPUs offline -- powering off.
> >> (XEN) d3v0 handle_pio port 0xb004 read 0x0000
> >> (XEN) d3v0 handle_pio port 0xb004 read 0x0000
> >> (XEN) d3v0 handle_pio port 0xb004 write 0x0001
> >> (XEN) d3v0 handle_pio port 0xb004 write 0x2001
> >> (XEN) d4v0 XEN_DMOP_remote_shutdown domain 3 reason 0
> >> (XEN) d4v0 domain 3 domain_shutdown vcpu_id 0 defer_shutdown 1
> >> (XEN) d4v0 XEN_DMOP_remote_shutdown domain 3 done
> >> (XEN) hvm.c:1620:d5v0 All CPUs offline -- powering off.
> >> (XEN) d1v0 handle_pio port 0xb004 read 0x0000
> >> (XEN) d1v0 handle_pio port 0xb004 read 0x0000
> >> (XEN) d1v0 handle_pio port 0xb004 write 0x0001
> >> (XEN) d1v0 handle_pio port 0xb004 write 0x2001
> >> (XEN) d2v0 XEN_DMOP_remote_shutdown domain 1 reason 0
> >> (XEN) d2v0 domain 1 domain_shutdown vcpu_id 0 defer_shutdown 1
> >> (XEN) d2v0 XEN_DMOP_remote_shutdown domain 1 done
> >> (XEN) grant_table.c:3702:d0v0 Grant release 0x3 ref 0x11d flags 0x2 d6
> >> (XEN) grant_table.c:3702:d0v0 Grant release 0x4 ref 0x11e flags 0x2 d6
> >> (XEN) d3v0 handle_pio port 0xb004 read 0x0000
> > 
> > Perhaps in this message could you also log
> > v->domain->is_shutting_down, v->defer_shutdown, and
> > v->paused_for_shutdown?
> 
> And v->domain->is_shut_down please.

Here it is:

(XEN) hvm.c:1620:d6v0 All CPUs offline -- powering off.
(XEN) d3v0 handle_pio port 0xb004 read 0x0000 is_shutting_down 0 defer_shutdown 0 paused_for_shutdown 0 is_shut_down 0
(XEN) d3v0 handle_pio port 0xb004 read 0x0000 is_shutting_down 0 defer_shutdown 0 paused_for_shutdown 0 is_shut_down 0
(XEN) d3v0 handle_pio port 0xb004 write 0x0001 is_shutting_down 0 defer_shutdown 0 paused_for_shutdown 0 is_shut_down 0
(XEN) d3v0 handle_pio port 0xb004 write 0x2001 is_shutting_down 0 defer_shutdown 0 paused_for_shutdown 0 is_shut_down 0
(XEN) d4v0 XEN_DMOP_remote_shutdown domain 3 reason 0
(XEN) d4v0 domain 3 domain_shutdown vcpu_id 0 defer_shutdown 1
(XEN) d4v0 XEN_DMOP_remote_shutdown domain 3 done
(XEN) hvm.c:1620:d5v0 All CPUs offline -- powering off.
(XEN) d1v0 handle_pio port 0xb004 read 0x0000 is_shutting_down 0 defer_shutdown 0 paused_for_shutdown 0 is_shut_down 0
(XEN) d1v0 handle_pio port 0xb004 read 0x0000 is_shutting_down 0 defer_shutdown 0 paused_for_shutdown 0 is_shut_down 0
(XEN) d1v0 handle_pio port 0xb004 write 0x0001 is_shutting_down 0 defer_shutdown 0 paused_for_shutdown 0 is_shut_down 0
(XEN) d1v0 handle_pio port 0xb004 write 0x2001 is_shutting_down 0 defer_shutdown 0 paused_for_shutdown 0 is_shut_down 0
(XEN) d2v0 XEN_DMOP_remote_shutdown domain 1 reason 0
(XEN) d2v0 domain 1 domain_shutdown vcpu_id 0 defer_shutdown 1
(XEN) d2v0 XEN_DMOP_remote_shutdown domain 1 done
(XEN) grant_table.c:3702:d0v1 Grant release 0x3 ref 0x125 flags 0x2 d6
(XEN) grant_table.c:3702:d0v1 Grant release 0x4 ref 0x126 flags 0x2 d6
(XEN) d1v0 handle_pio port 0xb004 read 0x0000 is_shutting_down 1 defer_shutdown 1 paused_for_shutdown 0 is_shut_down 0
(XEN) d1v0 Unexpected PIO status 1, port 0xb004 read 0xffff

(and then the stacktrace saying it's from vmexit handler)

Regarding BUG/WARN - do you think I could get any more info then? I
really don't mind crashing that system, it's a virtual machine
currently used only for debugging this issue.

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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