Re: [Qemu-devel] [TestDays] s390x emulation error

["Andreas Färber" <afaerber@suse.de>]

Am 10.11.2011 13:36, schrieb Alexander Graf:
> 
> On 10.11.2011, at 12:29, Andreas Färber <afaerber@suse.de> wrote:
> 
>> Am 10.11.2011 11:32, schrieb Alexander Graf:
>>>
>>> On 10.11.2011, at 10:53, Andreas Färber <afaerber@suse.de> wrote:
>>>
>>>> Is there a known issue with running multiple instances of
>>>> qemu-system-s390x? I got a hang on openSUSE 12.1 RC2 x86_64 host:
>>>>
>>>> 0x00007f0de7f698d4 in __lll_lock_wait () from /lib64/libpthread.so.0
>>>> (gdb) bt
>>>> #0  0x00007f0de7f698d4 in __lll_lock_wait () from /lib64/libpthread.so.0
>>>> #1  0x00007f0de7f651c5 in _L_lock_883 () from /lib64/libpthread.so.0
>>>> #2  0x00007f0de7f6501a in pthread_mutex_lock () from /lib64/libpthread.so.0
>>>> #3  0x000000000048b4a9 in qemu_mutex_lock (mutex=<optimized out>)
>>>>   at /home/andreas/QEMU/qemu/qemu-thread-posix.c:54
>>>> #4  0x00000000004cd3df in qemu_mutex_lock_iothread ()
>>>>   at /home/andreas/QEMU/qemu/cpus.c:843
>>>> #5  0x0000000000467580 in main_loop_wait (nonblocking=<optimized out>)
>>>>   at /home/andreas/QEMU/qemu/main-loop.c:459
>>>> #6  0x0000000000408984 in main_loop () at /home/andreas/QEMU/qemu/vl.c:1481
>>>> #7  main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>)
>>>>   at /home/andreas/QEMU/qemu/vl.c:3474
>>>>
>>>> Key presses didn't work, SDL window doesn't close, at 99.9% CPU.
>>>
>>> Huh? This is all generic code O_o. And no, it's not a known issue.
>>
>> Hm, reproducable by running
>>
>> $ s390x-softmmu/qemu-system-s390x
>>
>> (without arguments) on s390-next branch.
>>
>> I get compat_monitor0 console, but monitor or switching to real console
>> don't work and neither does closing. Same backtrace.
>>
>> Doesn't happen with ppc-softmmu/qemu-system-ppc or x86_64. Maybe an
>> issue with the monitor, only apparent when then monitor is shown at
>> startup rather than later user-invoked? Any suggestions?
> 
> Maybe the guest is executing an endless loop? Could you try to compile this asm blob for ppc and execute it with -kernel?
> 
> Test.S:
> 
> _start:
>   b .
> 
> 
> Compile with gcc test.S -nostdlib

Nope, doesn't hang.

Andreas

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