Re: [Xen-devel] [BUG] xen-mceinj tool testing cause dom0 crash

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 07.11.17 at 09:23, <xudong.hao@xxxxxxxxx> wrote:
>> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> Sent: Tuesday, November 7, 2017 4:09 PM
>> >>> On 07.11.17 at 02:37, <xudong.hao@xxxxxxxxx> wrote:
>> >> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> >> Sent: Monday, November 6, 2017 5:17 PM
>> >> >>> On 03.11.17 at 09:29, <xudong.hao@xxxxxxxxx> wrote:
>> >> > We figured out the problem, some corner scripts triggered the error
>> >> > injection at the same page (pfn 0x180020) twice, i.e. "./xen-mceinj
>> >> > -t 0" run over one time, which resulted in Dom0 crash.
>> >>
>> >> But isn't this a valid scenario, which shouldn't result in a kernel crash?
>> > What if
>> >> two successive #MCs occurred for the same page?
>> >> I.e. ...
>> >>
>> >
>> > Yes, it's another valid scenario, the expect result is kernel crash.
>> 
>> Kernel _crash_ or rather kernel _panic_? Of course without any kernel 
>> messages
>> we can't tell one from the other, but to me this makes a difference 
>> nevertheless.
>> 
> Exactly, Dom0 crash.

I don't believe a crash is the expected outcome here.

> And I didn't see any "kernel panic" message from the log -- attach the 
> original log again.

Well, as said - there _no_ kernel log message at all, and hence we
can't tell whether it's a crash or a plain panic. Iirc Xen's "Hardware
Dom0 crashed" can't distinguish the two cases.

Jan


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