Re: Reboots and Panics(4.1.2/4.2-unstable)

[Paul S <pstroud@gmail.com>]

[-- Attachment #1.1: Type: text/plain, Size: 4814 bytes --]

File attached.

On Fri, Feb 17, 2012 at 4:14 PM, Paul S <pstroud@gmail.com> wrote:

> Andrew,
> Thanks for the quick response! I was finally able to capture it and get a
> bit more information. The problem does not always happen, even on 4.1.2, I
> was able to get it to boot a few times, though I was never able to get
> 4.2-unstable to boot. There was lots of strangeness, such as after I built
> and installed 4.1.1, it worked, but then, so did 4.1.2, now neither is
> working.
>
> That being said, I caught it on video, and captured a picture of the final
> dump. I watched the video frame by frame and the boot actually got much
> further than I thought it was.
>
> I can see that even though it does not bring up two of the CPUs, the boot
> continues into the kernel and dies somewhere with a:
>
> BUG: Unable to handle paging request at FFFc7f(maybe).
>
> I have captured several images from the video that shows the progression
> of the boot before the crash. I think I have gotten things badly out of
> whack at this point, so I'm going to stop, reinstall everything and move
> back to 4.1.1 and see if I can get things working again.
>
> Let me know if anything in the pictures helps, or if you would like the
> video as well.
>
> Paul
>
> On Fri, Feb 17, 2012 at 11:39 AM, Andrew Cooper <andrew.cooper3@citrix.com
> > wrote:
>
>> On 17/02/12 16:21, Paul S wrote:
>> > Environment:
>> > ASRock Z86 Extreme4 - Intel i5 2500
>> > http://www.asrock.com/mb/overview.asp?Model=Z68%20Extreme4
>> >
>> > I have installed the latest UEFI patch(1.70) and all tests were run
>> > from a reset of everything to default. I have tested with both Ubuntu
>> > 11.10 and Fedora 16 and get the same results on both, including
>> > building xen 4.2-unstable. I bought this particular MB because it had
>> > a know working vt-d implementation via VMWare.
>> >
>> > NOTE: current unstable as of last night is still affected by this
>> > library error http://www.gossamer-threads.com/lists/xen/devel/234300
>> >
>> > However, after correcting the library error, I was able to complete
>> > the unstable build.
>> >
>> > In both cases, it either stops with a panic/blank screen, or just
>> reboots.
>> >
>> > Here are some other notes:
>> >
>> > 1) If x2apic is enabled on the motherboard, it almost immediately
>> > reboots with any of the configurations above
>>
>> There are some fairly strict set of requirements on what which MSRs you
>> can wrt xAPIC/x2APIC mode.  It is possible that we are tickling an MSR
>> early in boot which results in a protection fault.
>>
>> >
>> > 2) The boot gets to here:
>> >
>> > (XEN) HVM: VMX enabled
>> >
>> > (XEN) HVM: Hardware Assisted Paging detected.
>> >
>> >
>> > Then goes to a "(XEN)Failed to bring up CPU x(error -5)" and this is
>> > where it hangs with the blank/panic screen or reboots. This sometimes
>> > shows up on CPU 1, CPU2, or both.
>> >
>> >
>> > 3) There is no boot log written and the machine does not have a native
>> > serial port, so capturing anything may prove difficult, but I am open
>> > to suggestions.
>> >
>>
>> Try booting with noreboot - that should keep any panic message on screen
>> until you manually choose to reset the machine.  Seeing where in the
>> panic occurs would be very helpful, even if you just transcribe a few
>> lines manually.
>>
>> >
>> > 4) Xen Live(http://wiki.xen.org/wiki/LiveCD) works ok, unless x2apic
>> > is enabled, then it simply panics and reboots.
>> >
>> > The logs(xen_live.tgz) are attached. Note this was captured with VT-d
>> > being enabled, but I did check it with VT-d enabled and the boot
>> > looked the same. I can capture it again if needed.
>> >
>> >
>> > 5) Xen Server 6.0.0 works, with Xen 4.1.1, with both VT-d
>> > enabled(which shows working in xl) and x2apic enabled.
>> >
>> > I have also attached(xen_server_6.0.0.tar.gz) these logs, which
>> > includes logs both with and without VT-d and x2apic enabled. I did not
>> > actually create any VMs, only booted this and checked what xl reported.
>> >
>> >
>>
>> That is rather interesting - I am not aware of any XenServer specific
>> changes in this regard.
>>
>> > If there is anything else I can add, please let me know. I am going to
>> > download 4.1.1 now, build it and see if it works, because it does on
>> > Xen Server. I am open to testing anything as this is an original build
>> > on this box, so I'm willing to knock it around if it will help.
>> >
>> > #
>> >
>>
>> Knowing whether upstream 4.1.1 works will be very useful in workout out
>> whether it is a regression introduced into unstable, or whether there is
>> some XenServer specific change which we should upstream.
>>
>> > Thanks,
>> >
>> > Paul
>> >
>>
>> --
>> Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
>> T: +44 (0)1223 225 900, http://www.citrix.com
>>
>>
>

[-- Attachment #1.2: Type: text/html, Size: 6393 bytes --]

[-- Attachment #2: images.zip --]
[-- Type: application/zip, Size: 401845 bytes --]

[-- Attachment #3: Type: text/plain, Size: 138 bytes --]

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel