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Date: Sat, 20 Oct 2007 16:49:41 +0200
From: Aurelien Jarno <aurelien@aurel32.net>
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Subject: Re: [Qemu-devel] I got a kernel booted under qemu-system-ppc !
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To: qemu-devel@nongnu.org
Cc: Jocelyn Mayer <l_indien@magic.fr>, Milton Miller <miltonm@bga.com>

Aurelien Jarno a écrit :
> Aurelien Jarno a écrit :
> 
>> I have used QEMU CVS with a Debian Sid image. It basically works, I am
>> even able to login via SSH, but I have noticed two problems:
>>
>> - Some process hang, stay into "D" state and become unkillable. It seems
>>   it can happen to all processes, but it is always reproducible with
>>   uptime or top. I still don't know if it is a problem of the kernel or
>>   if it comes from the emulation.
> 
> This problem arise when using floating point instructions. It can be
> easily triggered by running the following testcase:
> 
> #include <stdio.h>
> 
> int main()
> {
>         double a = 1.34;
>         printf("%.2f", a);
>         return 0;
> }
> 

This is actually not enough to trigger the bug. The testcase works if
the bug has already been trigger in another process before, for example
uptime.

-- 
  .''`.  Aurelien Jarno	            | GPG: 1024D/F1BCDB73
 : :' :  Debian developer           | Electrical Engineer
 `. `'   aurel32@debian.org         | aurelien@aurel32.net
   `-    people.debian.org/~aurel32 | www.aurel32.net