[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Xen-devel] domain_crash_sync vs "plain crash"
@Andrew,
Despite SCHED_OP, that I've blacklisted, which one came to mind? On 07/05/2018 08:09, Jan Beulich wrote:
>>>> On 07.05.18 at 03:06, <charles.fg@xxxxxxxxx> wrote:
>> When I'm performing some hypercalls with some "unexpected" parameters
>> (robustness test) sometimes the guest is explicitly "killed" by xen
>> calling the domain_crash(), but sometimes the guest just crash without any
>> explicit message on dmesg or logs.
>>
>> Are those "plain crashes" an expected behavior by design on Xen or are they
>> some untreated parameter checking or something else?
> A silent crash is never supposed to happen, but you always need to first
> consider whether the crashing component actually has a way to get
> something out to wherever you monitor its logs. That is, without (physical
> or virtual, depending on component) serial console you're often unlikely to
> actually observe any messages connected to the crash.
>
> If you can track down a _truly_ silent crash to its origin, submitting a patch
> to make it non-silent would be appreciated.
Alternatively, if you are fuzzing the hypercalls, which it sounds like
you are, then you need to ensure that you blacklist operations such as
SCHEDOP_shutdown and SCHEDOP_poll to avoid the fuzzer hitting legitimate
hypercalls which shut down or block for indefinite periods of time.
~Andrew
Atenciosamente, Charles F.'. Gonçalves _______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel
|
