Re: [Qemu-devel] qemu-kvm-1.0.1 - unable to exit if vcpu is in infinite loop

[Peter Lieven]

Am 01.07.2012 um 10:19 schrieb Avi Kivity:

> On 06/28/2012 10:27 PM, Peter Lieven wrote:
>> 
>> Am 28.06.2012 um 18:32 schrieb Avi Kivity:
>> 
>>> On 06/28/2012 07:29 PM, Peter Lieven wrote:
>>>>> Yes. A signal is sent, and KVM returns from the guest to userspace on
>>>>> pending signals.
>>> 
>>>> is there a description available how this process exactly works?
>>> 
>>> The kernel part is in vcpu_enter_guest(), see the check for
>>> signal_pending().  But this hasn't seen changes for quite a long while.
>> 
>> Thank you, i will have a look. I noticed a few patches that where submitted
>> during the last year, maybe one of them is related:
>> 
>> Switch SIG_IPI to SIGUSR1
>> Fix signal handling of SIG_IPI when io-thread is enabled
>> 
>> In the first commit there is mentioned a "32-on-64-bit Linux kernel bug"
>> is there any reference to that?
> 
> 
> http://web.archiveorange.com/archive/v/1XS1vwGSFLyYygwTXg1K.  Are you
> running 32-on-64?

I think the issue occurs when running a 32-bit guest on a 64-bit system. Afaik, 
the
isolinux loader where is see the race is 32-bit altough it is a 64-bit ubuntu 
lts
cd image. The second case where i have seen the race is on shutdown of a
Windows 2000 Server which is also 32-bit.

Peter

> 
> 
> -- 
> error compiling committee.c: too many arguments to function
> 
>