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

[Alexander Graf]

On 10.11.2011, at 12:29, Andreas Färber <address@hidden> wrote:

> Am 10.11.2011 11:32, schrieb Alexander Graf:
>> 
>> On 10.11.2011, at 10:53, Andreas Färber <address@hidden> 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


Alex

>