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

[Zhanghaoyu (A)]

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

Zhang Haoyu