CentOS virt - Apr 2017 - Clocksource boot issues 4.9.13

Hi all

I?ve got a few Intel Z87 chipset machines with Adaptec 5405 raid cards (latest
firmware), they work fine on 3.18 but during Dom0 boot using kernel 4.9.13 it
hangs at ?Using clocksource tsc? and the aacraid driver keeps trying to reset

Has anyone seen anything like this?

I?ve tried specifying clocksource=xen in grub instead of the default of tsc, and
that has the same issue. HPET is enabled and Xen is seeing it:

(XEN) ACPI: HPET D9649CB0, 0038 (r1 ALASKA    A M I  1072009 AMI.        5)
(XEN) Platform timer is 14.318MHz HPET

Thanks
Chris
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On 04/02/2017 02:49 AM, Chris Elliott wrote:
> Hi all
> 
> I?ve got a few Intel Z87 chipset machines with Adaptec 5405 raid cards
(latest firmware), they work fine on 3.18 but during Dom0 boot using kernel
> 4.9.13 it hangs at ?Using clocksource tsc? and the aacraid driver keeps
trying to reset
> 
> Has anyone seen anything like this?
> 
> I?ve tried specifying clocksource=xen in grub instead of the default of
tsc, and that has the same issue. HPET is enabled and Xen is seeing it:
> 
> (XEN) ACPI: HPET D9649CB0, 0038 (r1 ALASKA    A M I  1072009 AMI.        5)
(XEN) Platform timer is 14.318MHz HPET
I saw a hang at a similar place in the boot process when trying to boot
xen-on-xen for our test system. On a hunch I was going to to try recompiling
without the PVHVM PCI related driver (pci-platform ? platform-pci ? ) before
saying anything about it.

Since you tried changing the clock source I'm wondering is that the boot
issue is unrelated to the clock source, in which case you may get a better
idea of what's hanging by comparing the boot logs from 3.18 to 4.9 and
seeing what's present in 3.18 but not in 4.9. Presumably the messages in the
3.18 but not 4.9 logs are either removed from the kernel source or happen after
whatever is hanging.

--Sarah

On Sun, Apr 2, 2017 at 9:22 PM, Sarah Newman <srn at prgmr.com>
wrote:
> On 04/02/2017 02:49 AM, Chris Elliott wrote:
>> Hi all
>>
>> I?ve got a few Intel Z87 chipset machines with Adaptec 5405 raid cards
(latest firmware), they work fine on 3.18 but during Dom0 boot using kernel
>> 4.9.13 it hangs at ?Using clocksource tsc? and the aacraid driver keeps
trying to reset
>>
>> Has anyone seen anything like this?
>>
>> I?ve tried specifying clocksource=xen in grub instead of the default of
tsc, and that has the same issue. HPET is enabled and Xen is seeing it:
>>
>> (XEN) ACPI: HPET D9649CB0, 0038 (r1 ALASKA    A M I  1072009 AMI.      
5) (XEN) Platform timer is 14.318MHz HPET
>
> I saw a hang at a similar place in the boot process when trying to boot
xen-on-xen for our test system. On a hunch I was going to to try recompiling
> without the PVHVM PCI related driver (pci-platform ? platform-pci ? )
before saying anything about it.
>
> Since you tried changing the clock source I'm wondering is that the
boot issue is unrelated to the clock source, in which case you may get a better
> idea of what's hanging by comparing the boot logs from 3.18 to 4.9 and
seeing what's present in 3.18 but not in 4.9. Presumably the messages in the
> 3.18 but not 4.9 logs are either removed from the kernel source or happen
after whatever is hanging.
The Xen-on-xen thing is a specific problem with nested Xen; I asked on
xen-devel and was pointed to this commit.

Unfortunately it's pretty unlikely this one will help Chris.

But perhaps, Chris, if you follow my example and post a bug report to
xen-devel (with serial output from Xen and the guest kernel), someone
may be able to find a patch which fixes the problem.

 -George
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