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Re: [Xen-devel] Hypervisor error messages after xl block-detach with linux 3.18-rc5



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@xxxxxxxx> 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


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