Re: [Xen-devel] [BUG] Emulation issues

[Roger Pau Monnà <roger.pau@xxxxxxxxxx>]

El 29/07/15 a les 12.27, Paul Durrant ha escrit:
>> -----Original Message-----
>> From: Roger Pau Monnà [mailto:roger.pau@xxxxxxxxxx]
>> Sent: 29 July 2015 11:17
>> To: xen-devel; Andrew Cooper; Paul Durrant
>> Subject: [BUG] Emulation issues
>>
>> Hello,
>>
>> While trying to debug a hotplug scripts issue, I came across what seems
>> to be an emulation bug inside of Xen. The result of this is a bunch of
>> repeated messages on the serial console:
>>
> 
> Was there anything of interest before this? You got an 'unhandleable' 
> emulation which generally should not happen, but I guess there may be a 
> shutdown race in tearing down the ioreq server list and sending emulation 
> requests which may cause hvm_send_ioreq() to return X86EMUL_UNHANDLEABLE. It 
> would be good to better understand the sequence of events.

I don't think there's anything relevant before the messages I've posted,
here is a more complete log:

(XEN) irq.c:386: Dom91 callback via changed to Direct Vector 0x93
(XEN) irq.c:386: Dom92 callback via changed to Direct Vector 0x93
(XEN) irq.c:276: Dom91 PCI link 0 changed 5 -> 0
(XEN) irq.c:276: Dom91 PCI link 1 changed 10 -> 0
(XEN) irq.c:276: Dom91 PCI link 2 changed 11 -> 0
(XEN) irq.c:276: Dom91 PCI link 3 changed 5 -> 0
(XEN) irq.c:276: Dom92 PCI link 0 changed 5 -> 0
(XEN) irq.c:276: Dom92 PCI link 1 changed 10 -> 0
(XEN) irq.c:276: Dom92 PCI link 2 changed 11 -> 0
(XEN) irq.c:276: Dom92 PCI link 3 changed 5 -> 0
INIT: Id "T0" respawning too fast: disabled for 5 minutes
(XEN) io.c:165:d83v0 Weird HVM ioemulation status 1.
(XEN) domain_crash called from io.c:166
(XEN) io.c:165:d83v0 Weird HVM ioemulation status 1.
(XEN) domain_crash called from io.c:166
(XEN) io.c:165:d83v0 Weird HVM ioemulation status 1.
(XEN) domain_crash called from io.c:166
(XEN) io.c:165:d83v0 Weird HVM ioemulation status 1.
(XEN) domain_crash called from io.c:166
(XEN) io.c:165:d83v0 Weird HVM ioemulation status 1.
(XEN) domain_crash called from io.c:166
(XEN) io.c:165:d83v0 Weird HVM ioemulation status 1.
(XEN) domain_crash called from io.c:166
(XEN) io.c:165:d83v0 Weird HVM ioemulation status 1.
(XEN) domain_crash called from io.c:166
(XEN) io.c:165:d83v0 Weird HVM ioemulation status 1.
(XEN) domain_crash called from io.c:166
(XEN) io.c:165:d83v0 Weird HVM ioemulation status 1.
(XEN) domain_crash called from io.c:166
(XEN) io.c:165:d83v0 Weird HVM ioemulation status 1.
(XEN) domain_crash called from io.c:166

If you can provide a debug/trace patch I can run the same workload with
it in order to trace the sequence of events.

Roger.


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