Re: [Xen-devel] [PATCH] Xen: Force non-irq keyhandler to be run in tasklet when receive a debugkey from serial port

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 24.10.16 at 15:29, <tianyu.lan@xxxxxxxxx> wrote:
> On 10/24/2016 8:19 AM, Konrad Rzeszutek Wilk wrote:
>> On Sat, Oct 22, 2016 at 07:23:03PM +0800, Lan Tianyu wrote:
>>> __serial_rx() runs in either irq handler or timer handler and non-irq
>>> keyhandler should not run in these contexts. So always force non-irq
>>> keyhandler to run in tasklet when receive a debugkey from serial port
>>
>> If the machine is hung with an IRQ handler being stuck, and
>> one does 'Ctrl-Ax3` followed by 'C' .. which would not be invoked
>> (as it is not an IRQ handler??
> 
> If serial port's interrupt still works in this case, the 'C'
> keyhandler kexec_crash() will be invoked in a tasklet. This behavior was
> changed by my patches if includes this patch.

As indicated already by Konrad's reply, this is not going to be
acceptable.

Jan

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