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SubjectRe: Hang while booting 4.15.7

On 3/8/2018 1:02 PM, Brian Rak wrote:
> On 3/8/2018 12:49 PM, Randy Dunlap wrote:
>> On 03/08/2018 08:21 AM, Brian Rak wrote:
>>> We have some Dell servers running Intel Gold 6126 processors. Some
>>> of them hang on boot under 4.15.7, but work fine on 4.14.14.  When
>>> they hang, we see the following on console:
>>> Error parsing PCC subspaces from PCCT
>>> watchdog: BUG: soft lockup - CPU #16 stuck for 23s! [swapper/0:1]
>>> We see that PCC subspaces error under 4.14 as well, but it doesn't
>>> cause the machine to hang.
>>> So far we haven't been able to correlate these hangs with anything
>>> in particular.  Some machines will hang, some machines will boot. 
>>> They're otherwise identical as far as hardware and firmware goes.
>>> I've tried pcie_aspm=off, since that seems to be the next bit of
>>> code that's being executed.  This resulted in the machine booting a
>>> little further, but then oopsing somewhere in acpi_os_purge_cache.
>>> I'm not able to get a full trace there, as I don't have serial
>>> access easily available.
>>> Any suggestions?
>> Hi,
>> The first thing that I would do is boot with:
>>    ignore_loglevel initcall_debug
>> on the kernel boot command line.
>> That will add lots of messages and maybe give us a stronger hint
>> about where
>> the hang is actually happening.
>> And then worst case (without a boot log via serial console or
>> netconsole) is
>> to take a photo of the screen with the oops messages.
>> And if you are fairly certain that it's an ACPI issue, also write to the
>> mailing list.
> Thanks!
> I booted with those parameters, and this certainly seems like an ACPI
> issue.  During bootup, the machine paused here for about 20s:
> then it started printing this trace:
> (I can't see to figure out a decent way to capture the beginning of
> the trace here, I'll have to see if I can get the serial console working)
I got the serial console working, that's just the end of the CPU stuck

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