Re: Hypervisor error messages after xl block-detach with linux 3.18-rc5

[Juergen Gross <jgross@suse.com>]

On 11/24/2014 11:59 AM, Juergen Gross wrote:
> On 11/24/2014 11:20 AM, Jan Beulich wrote:
>>>>> On 24.11.14 at 10:55, <JGross@suse.com> wrote:
>>> - Sometimes I see only NMI watchdog messages, looking into hanging cpu
>>>     state via xen debug keys I can see the cpu(s) in question are
>>> spinning
>>>     in _raw_spin_lock():
>>>     __handle_mm_fault()->__pte_alloc()->pmd_lock()->_raw_spin_lock()
>>>     The hanging cpus were executing some random user processes (cron,
>>>     bash, xargs), cr2 contained user addresses.
>>
>> Is this perhaps what
>> http://lists.xenproject.org/archives/html/xen-devel/2014-11/msg02135.html
>> appears to be about?
>
> Hmm, I'm not sure.
>
> I'll try a 3.17 kernel to verify.

Still seeing the issue, but less frequent. OTOH I just found in above
thread in lkml that 3.17 is showing that issue, too. :-(

I'll try to setup a pv-variant of Linus' patch and test it...


Juergen