[root@dom0test ~]# cat /etc/redhat-release 
Fedora release 10 (Cambridge)

[root@dom0test ~]# rpm -qa|grep libvirt
libvirt-debuginfo-0.5.1-2.fc10.i386
libvirt-python-0.5.1-2.fc10.i386
libvirt-0.5.1-2.fc10.i386

This happens when you hit CTRL+C during virt-install execution.. 


[root@dom0test ~]# gdb /usr/sbin/libvirtd
GNU gdb Fedora (6.8-29.fc10)
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...
(gdb) run
Starting program: /usr/sbin/libvirtd
[Thread debugging using libthread_db enabled]
libvir: QEMU error : internal error cannot create bridge 'virbr0' : File exists
Failed to autostart network 'default': internal error cannot create bridge 'virbr0' : File exists
Detaching after fork from child process 11807.
Detaching after fork from child process 11808.
[New Thread 0xb7990710 (LWP 11806)]

[New Thread 0xb7656b90 (LWP 11814)]
[Thread 0xb7656b90 (LWP 11814) exited]
[New Thread 0xb7656b90 (LWP 11821)]
[New Thread 0xb6e47b90 (LWP 11965)]
[New Thread 0xb6646b90 (LWP 12213)]
[Thread 0xb6646b90 (LWP 12213) exited]

Program received signal SIGSEGV, Segmentation fault.
virFree (ptrptr=0x1a4) at memory.c:177
177         free(*(void**)ptrptr);
(gdb) 
(gdb) thread apply all bt
Thread 4 (Thread 0xb6e47b90 (LWP 11965)):
#0  0xb7ffd416 in __kernel_vsyscall ()
#1  0xb7c5d19b in read () from /lib/libpthread.so.0
#2  0xb7c8747e in read () at /usr/include/bits/unistd.h:45
#3  read_all (fd=22, data=0x8107c30, len=16) at xs.c:271
#4  0xb7c87513 in read_message (h=0x8107738) at xs.c:830
#5  0xb7c8767f in read_thread (arg=0x8107738) at xs.c:885
#6  0xb7c5651f in start_thread (arg=0xb6e47b90) at pthread_create.c:297
#7  0xb7bc004e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 3 (Thread 0xb7656b90 (LWP 11821)):
#0  0xb7ffd416 in __kernel_vsyscall ()
#1  0xb7c5d19b in read () from /lib/libpthread.so.0
#2  0xb7c8747e in read () at /usr/include/bits/unistd.h:45
#3  read_all (fd=16, data=0x8106688, len=16) at xs.c:271
#4  0xb7c87513 in read_message (h=0x8106a28) at xs.c:830
#5  0xb7c8767f in read_thread (arg=0x8106a28) at xs.c:885
#6  0xb7c5651f in start_thread (arg=0xb7656b90) at pthread_create.c:297
#7  0xb7bc004e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb7990710 (LWP 11806)):
#0  virFree (ptrptr=0x1a4) at memory.c:177
#1  0xb7f12703 in xenUnifiedDomainInfoListFree (list=0x8106828) at xen_unified.c:1485
#2  0xb7f2a002 in xenStoreClose (conn=0x80b50c8) at xs_internal.c:392
#3  0xb7f139f9 in xenUnifiedClose (conn=0x80b50c8) at xen_unified.c:387
#4  0xb7edb744 in virConnectClose (conn=0x80b50c8) at libvirt.c:1062
#5  0x0805225b in qemudDispatchClientFailure (server=<value optimized out>, client=0x8108468)
    at qemud.c:1282
#6  0x08052d9b in qemudDispatchClientEvent (watch=72, fd=20, events=9, opaque=0x80a6540)
    at qemud.c:1659
#7  0x0805129d in virEventDispatchHandles () at event.c:377
---Type <return> to continue, or q <return> to quit---
#8  virEventRunOnce () at event.c:499
#9  0x080526c4 in qemudOneLoop () at qemud.c:1727
#10 qemudRunLoop (server=0x80a6540) at qemud.c:1767
#11 0x080554f7 in main (argc=1, argv=Cannot access memory at address 0x14
) at qemud.c:2324
(gdb)