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

From: Michael McConnell
Subject: Re: [Qemu-devel] QEMU 0.8.1 VNC: Segfault on closing
Date: Sun, 21 May 2006 19:57:26 +0100 (BST)

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.

> 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 
address@hidden 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 
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
address@hidden QEMU]# gdb ls

I have no idea what this "dwarf error" is.

-- Michael "Soruk" McConnell
   Eridani Star System

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