Re: Crash in RTC

[Konstantin Kostiuk <kkostiuk@redhat.com>]

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On Wed, Aug 24, 2022 at 5:37 PM Konstantin Kostiuk <kkostiuk@redhat.com>
wrote:

> Hi Michael and Paolo,
>
> I write to you as maintainers of mc146818rtc.c. I am working on bug
> https://bugzilla.redhat.com/show_bug.cgi?id=2054781
> and reproduced it on the current master branch.
>
> I added some print at line 202 (before assert(lost_clock >= 0),
> https://gitlab.com/qemu-project/qemu/-/blob/master/hw/rtc/mc146818rtc.c#L202)
> and got the following values:
>
> next_periodic_clock, old_period, last_periodic_clock, cur_clock,
> lost_clock, current_time
> 54439076429968, 32, 54439076429936, 54439076430178, 242,
> 1661348768010822000
> 54439076430224, 512, 54439076429712, 54439076430188, 476,
> 1661348768011117000
> 54439076430224, 32, 54439076430192, 54439076429884, -308,
> 1661348768001838000
>
> The current_time value in the last print is lower than in the previous one.
> So, the error occurs because time has gone backward.
>
> I think this is a possible situation during time synchronization.
> My question is what should we do in this case?
>
> Best Regards,
> Konstantin Kostiuk.
>

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