Re: [Qemu-devel] reply: reply: qemu crashed when starting vm(kvm) with vnc connect

[Stefan Hajnoczi]

On Mon, Apr 08, 2013 at 12:27:06PM +0000, Zhanghaoyu (A) wrote:
> On Sun, Apr 07, 2013 at 04:58:07AM +0000, Zhanghaoyu (A) wrote:
> > >>> I start a kvm VM with vnc(using the zrle protocol) connect, sometimes 
> > >>> qemu program crashed during starting period, received signal SIGABRT.
> > >>> Trying about 20 times, this crash may be reproduced.
> > >>> I guess the cause memory corruption or double free.
> > >>
> > >> Which version of QEMU are you running?
> > >> 
> > >> Please try qemu.git/master.
> > >> 
> > >> Stefan
> > >
> > >I used the QEMU download from qemu.git (http://git.qemu.org/git/qemu.git).
> >
> > Great, thanks!  Can you please post a backtrace?
> > 
> > The easiest way is:
> > 
> >  $ ulimit -c unlimited
> >  $ qemu-system-x86_64 -enable-kvm -m 1024 ...
> >  ...crash...
> >  $ gdb -c qemu-system-x86_64.core
> >  (gdb) bt
> > 
> > Depending on how your system is configured the core file might have a 
> > different filename but there should be a file name *core* the current 
> > working directory
> after the crash.
> > 
> > The backtrace will make it possible to find out where the crash occurred.
> > 
> > Thanks,
> > Stefan
> 
> backtrace from core file is shown as below:
> 
> Program received signal SIGABRT, Aborted.
> 0x00007f32eda3dd95 in raise () from /lib64/libc.so.6
> (gdb) bt
> #0  0x00007f32eda3dd95 in raise () from /lib64/libc.so.6
> #1  0x00007f32eda3f2ab in abort () from /lib64/libc.so.6
> #2  0x00007f32eda77ece in __libc_message () from /lib64/libc.so.6
> #3  0x00007f32eda7dc06 in malloc_printerr () from /lib64/libc.so.6
> #4  0x00007f32eda7ecda in _int_free () from /lib64/libc.so.6
> #5  0x00007f32efd3452c in free_and_trace (mem=0x7f3290000cd0) at vl.c:2880
> #6  0x00007f32efd251a1 in buffer_free (buffer=0x7f32f0c82890) at ui/vnc.c:505
> #7  0x00007f32efd20c56 in vnc_zrle_clear (vs=0x7f32f0c762d0)
>     at ui/vnc-enc-zrle.c:364
> #8  0x00007f32efd26d07 in vnc_disconnect_finish (vs=0x7f32f0c762d0)
>     at ui/vnc.c:1050
> #9  0x00007f32efd275c5 in vnc_client_read (opaque=0x7f32f0c762d0)
>     at ui/vnc.c:1349
> #10 0x00007f32efcb397c in qemu_iohandler_poll (readfds=0x7f32f074d020,
>     writefds=0x7f32f074d0a0, xfds=0x7f32f074d120, ret=1) at iohandler.c:124
> #11 0x00007f32efcb46e8 in main_loop_wait (nonblocking=0) at main-loop.c:417
> #12 0x00007f32efd31159 in main_loop () at vl.c:2133
> #13 0x00007f32efd38070 in main (argc=46, argv=0x7fff7f5df178,
>     envp=0x7fff7f5df2f0) at vl.c:4481

CCing Corentin and Gerd who are more familiar with the VNC code than me.

Stefan