Re: kvm-78 - kernel panic after using system_reset except when using -no-kvm-irqchip

[Jan Kiszka <jan.kiszka@web.de>]

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Jan Kiszka wrote:
> Charles Duffy wrote:
>> Jan Kiszka wrote:
>>> Charles Duffy wrote:
>>>> irq 25, desc: ffffffff803afc80, depth: 1, count: 0, unhandled: 0
>>>> ->handle_irq():  ffffffff800b54e3, handle_bad_irq+0x0/0x1f6
>>>> ->chip(): ffffffff802ea700, 0xffffffff802ea700
>>>> ->action(): 0000000000000000
>>>>   IRQ_DISABLED set
>>>> unexpected IRQ trap at vector 19
>>>> ..MP-BIOS bug: 8254 timer not connected to IO-APIC
>>>> timer doesn't work through the IO-APIC - disabling NMI Watchdog!
>>>> Kernel panic - not syncing: IO-APIC + timer doesn't work! Try using the
>>>> 'noapic' kernel parameter
>>> Still too early for me, so I didn't get yet if you can trigger this
>>> guest panic reliably or only sporadically (like I can). In the former
>>> case I would be very interested in the how!
>> Reproduced 100% of the time when using system_reset at the qemu monitor
>> console coming from a non-panic'd state. (Thus, it happens only every
>> other time doing a series of boots and system_reset monitor commands).
> 
> Mmmh, /that/ sounds like some (re-)initialization issue of the
> virtualized hardware. OK, once that kernel boots again on latest kvm.git
> (currently broken due to a different issue), I will try to reproduce it.

OK, I can reproduce now. It's an in-kernel irqchip, -no-kvm-irqchip
doesn't suffer. Will see if I can find the reason.

Jan


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