Re: [Qemu-devel] [PATCH 2/2] qemu-timer: move timeBeginPeriod/timeEndPeriod to os-win32

[Jacob Kroon]

Hi Stefan,

On Thu, Feb 21, 2013 at 7:25 AM, Stefan Weil <address@hidden> wrote:
> Am 21.02.2013 00:49, schrieb Jacob Kroon:
>> On Wed, Feb 20, 2013 at 9:46 PM, Jacob Kroon <address@hidden> wrote:
>>> Paolo,
>>>
>>> Just a heads up, I tried the patched qemu (1+2+3) on my laptop at
>>> home, which is running Windows 7 64-bit. I'm seeing qemu "lockups"
>>> appearing randomly.. Will try to debug it.
>>> On the other hand, plain vanilla 1.4.0 in Windows 7 seems to run fine
>>> with my VxWorks image..
>> So the problem seems to be related to wether I pass --enable-debug to
>> qemu configure script.
>> With debug enabled it runs fine in Windows 7 aswell. If I leave it out
>> I get what appears to be a lockup
>> a couple of seconds into the guest boot process. Best I could do for
>> now was to attach to the process
>> with gdb and get a backtrace:
>>
>> (gdb) bt
>> #0  0x76fc000d in ntdll!LdrFindResource_U ()
>>    from /cygdrive/c/Windows/SysWOW64/ntdll.dll
>> #1  0x7704f896 in ntdll!RtlQueryTimeZoneInformation ()
>>    from /cygdrive/c/Windows/SysWOW64/ntdll.dll
>> #2  0x6ce2c99b in ?? ()
>> #3  0x00000000 in ?? ()
>
> The backtrace is usually better for QEMU with TCG interpreter. Run
>
>      configure --enable-tcg-interpreter
>
> The resulting binaries are much slower, but no longer create
> code on the fly, so you get normal backtraces.
>
> I also had to remove -fstack-protector-all (in file configure) to
> get good backtraces for w32/w64.

Ok, I enabled the tcg interpreter and removed ssp from qemu. I have an
instance which appears to be stuck. The qemu tcg thread seems to be
executing, but there are 2 other threads that seem to be stalled:

(gdb) bt
#0  0x7c90e514 in ntdll!LdrAccessResource () from
/cygdrive/c/WINDOWS/system32/ntdll.dll
#1  0x7c90df4a in ntdll!ZwWaitForMultipleObjects ()
   from /cygdrive/c/WINDOWS/system32/ntdll.dll
#2  0x76b5aee9 in timeGetTime () from /cygdrive/c/WINDOWS/system32/WINMM.DLL
#3  0x7c80b729 in KERNEL32!GetModuleFileNameA ()
   from /cygdrive/c/WINDOWS/system32/kernel32.dll
#4  0x00000000 in ?? ()

(gdb) bt
#0  0x7c90e514 in ntdll!LdrAccessResource () from
/cygdrive/c/WINDOWS/system32/ntdll.dll
#1  0x7c90df5a in ntdll!ZwWaitForSingleObject () from
/cygdrive/c/WINDOWS/system32/ntdll.dll
#2  0x7c919b23 in ntdll!RtlpWaitForCriticalSection ()
   from /cygdrive/c/WINDOWS/system32/ntdll.dll
#3  0x7c901046 in ntdll!RtlEnumerateGenericTableLikeADirectory ()
   from /cygdrive/c/WINDOWS/system32/ntdll.dll

Regards
Jacob