Re: [Xen-devel] [BUG] unable to shutdown (page fault in mwait_idle()/do_dbs_timer()/__find_next_bit()) (fwd)

[Martin Cerveny <martin@xxxxxxxxx>]

Hello.

On Mon, 8 Jan 2018, Jan Beulich wrote:

> > > > On 07.01.18 at 13:34, <martin@xxxxxxxxx> wrote:
> > (XEN) ----[ Xen-4.10.0-vgpu  x86_64  debug=n   Not tainted ]----
> The -vgpu tag makes me wonder whether you have any patches in
> your tree on top of plain 4.10.0 (or 4.10-staging). Also the debug=n
> above ...
4.10.0 + 11 patches to make nvidia/vgpu work 
(https://github.com/xenserver/xen-4.7.pg).
debug=n because xen's modified debug build process.

> > (XEN)    [<ffff82d08026ae60>] __find_next_bit+0x10/0x80
> > (XEN)    [<ffff82d080253180>] cpufreq_ondemand.c#do_dbs_timer+0x160/0x220
> > (XEN)    [<ffff82d0802c7c0e>] mwait-idle.c#mwait_idle+0x23e/0x340
> > (XEN)    [<ffff82d08026fa56>] domain.c#idle_loop+0x86/0xc0
> ... makes this call trace unreliable. But even with a reliable call
> trace, analysis of the crash would be helped if you made
> available the xen-syms (or xen.efi, depending on how you boot)
> somewhere.
xen-syms - http://www.uschovna.cz/en/zasilka/UDP5LVE2679CGBIS-4YV/

> Finally, there being (as you say) a 10% probability of the crash -
> have you been able to connect its occurrence to anything that
> the system was doing prior to the shutdown/reboot attempt?
The same start/stop scripted from external system (IPMI+ssh).

> Actually - is this a problem with shutdown _only_, or also with
> reboot?
Tested again - start xen, dom0, start HVM domain (fedora24+passthrough 
quadro P2000), shutdown HVM domain and poweroff or reboot.
5 fails of 10 tries during "poweroff" ((XEN) Preparing system for ACPI S5 
state.)
No fail of 10 tries with "reboot" ((XEN) Hardware Dom0 shutdown: rebooting 
machine)

Thanks, Martin

PS: I looked back in time and I did not find this problem in serial 
console log with Xen4.5.0, 4.5.2, 4.5.3, 4.7.0, 4.8.0 (other versions untested).
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