Re: [Qemu-devel] QEMU 0.8.1 VNC: Segfault on closing

[Anthony Liguori <anthony@codemonkey.ws>]

Michael McConnell wrote:
> On Sun, 21 May 2006, Anthony Liguori wrote:
>
>   
>> Michael McConnell wrote:
>>     
>>> When I try to use QEMU's VNC server, every time I close the connection it
>>> segfaults.  So far I've been unable to trace the cause of this (gdb appears
>>> to be next to useless at tracing the execution), but it is totally
>>> repeatable.
>>>   
>>>       
>> Can you provide more information?  What VNC client are you using? 
>>     
>
> TightVNC 1.2.9 - and the fault can also be triggered by just telnetting to 
> the VNC port and closing the connection.
>   

Curious, I've not seen this myself and your configuration does not seem 
out of the ordinary.

Can you try with CVS and 0.8.1?  Also, make sure that you're doing a 
full build if you've built this from CVS as the dependences in the 
Makefile aren't good.

Regards,

Anthony Liguori

>   
>> What 
>> host architecture are you on?  What is the guest OS/target?
>>     
>
> I already gave that - REinserting immediately below.
> (It was in the second paragraph, which you inserted your reply above.)
> For those not familiar with AMD, the Athlon
> XP2000+ is an ix86 32-bit CPU.
>
>   
>>> Running with kqemu 1.3.0pre7 in -kernel-kqemu with Windows XP as the guest 
>>> operating system, the host is an Athlon XP2000+ running kernel 2.6.14, and 
>>> glibc 2.1.3. QEMU was compiled with gcc 3.4.3.
>>>       
>
>   
>> Can you provide a stack trace that leads to the seg fault?
>>     
>
> GDB seems unable to - this is how it started off when analysing the core 
> dump:
> [soruk@Zeskia QEMU]# gdb /usr/local/bin/qemu-i386 core
> GNU gdb 19991004
> Copyright 1998 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i386-redhat-linux"...
>
> Dwarf Error: Cannot handle DW_FORM_strp in DWARF reader.
>
> Core was generated by `qemu-i386 -m 128 -sync -kernel-kqemu -boot c -net 
> nic,macaddr=fe:fd:00:00:00:01'.
> Program terminated with signal 11, Segmentation fault.
> Reading symbols from /lib/libm.so.6...done.
> Reading symbols from /usr/lib/libz.so.1...done.
> Reading symbols from /usr/local/lib/libSDL-1.2.so.0...done.
> Reading symbols from /lib/libpthread.so.0...done.
> Reading symbols from /lib/libutil.so.1...done.
> Reading symbols from /lib/libc.so.6...done.
> Reading symbols from /lib/libdl.so.2...done.
> Reading symbols from /usr/X11R6/lib/libX11.so.6...done.
> Reading symbols from /usr/X11R6/lib/libXext.so.6...done.
> Reading symbols from /lib/ld-linux.so.2...done.
> #0  0x804ff4a in ?? ()
> (gdb) bt
> #0  0x804ff4a in ?? ()
> (gdb) quit
> [soruk@Zeskia QEMU]# gdb ls
>
> I have no idea what this "dwarf error" is.
>
> -- Michael "Soruk" McConnell
>    Eridani Star System
>
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