Hi, Libvirtd from latest git (HEAD fc8c1787) is segfaulting when I try to restore a previously saved domain (backtrace below). I was testing a custom QEMU when it happened first time, but it also happens with latest qemu.git (HEAD 162cbbd17). What I did to run libvirt from source was: 1. Build it $ ./autogen.sh --system --enable-compile-warnings=error $ ./configure --localstatedir=/var --sysconfdir=/etc --prefix=/usr --libdir=/usr/lib (this was needed because I had to re-ran configure and it ended up overwriting --system) $ make -j4 2. Stop system's libvirtd # systemctl stop libvitd 3. Change /etc/libvirt/qemu/Fedora18.xml to use a custom QEMU binary 4. Run libvirtd # ./daemon/libvirtd 5. Reproduce the problem with virsh # ./tools/virsh virsh # save Fedora18 foobar virsh # restore foobar error: Failed to restore domain from foobar error: End of file while reading data: Input/output error error: Failed to reconnect to the hypervisor 6. Change to the libvirtd terminal [...] 2013-04-03 20:01:58.742+0000: 32334: debug : virNetServerAddShutdownInhibition:795 : srv=0x1ecf3f0 inhibitions=1 2013-04-03 20:01:58.742+0000: 32334: debug : qemuProcessStart:3351 : Preparing host devices 2013-04-03 20:01:58.742+0000: 32334: debug : qemuProcessStart:3355 : Preparing chr devices 2013-04-03 20:01:58.742+0000: 32334: debug : qemuProcessStart:3364 : Generating domain security label (if required) ====== end of log ===== Segmentation fault (core dumped) [root@doriath libvirt]# Here's the backtrace: Core was generated by `/home/lcapitulino/work/src/upstream/libvirt/daemon/.libs/lt-libvirtd'. Program terminated with signal 11, Segmentation fault. #0 0x00007f7623a4e79f in virSecurityManagerGenLabel (mgr=0x7f760c022380, vm=<optimized out>) at security/security_manager.c:424 424 int virSecurityManagerGenLabel(virSecurityManagerPtr mgr, (gdb) bt #0 0x00007f7623a4e79f in virSecurityManagerGenLabel (mgr=0x7f760c022380, vm=<optimized out>) at security/security_manager.c:424 #1 0x00007f761467718c in qemuProcessStart (conn=conn@entry=0x7f7608000ad0, driver=driver@entry=0x7f760c009440, vm=vm@entry=0x7f760c2097d0, migrateFrom=migrateFrom@entry=0x7f76146dfeeb "stdio", stdin_fd=16, stdin_path=stdin_path@entry=0x7f7600000a90 "/home/lcapitulino/work/src/upstream/libvirt/foobar", snapshot=snapshot@entry=0x0, vmop=vmop@entry=VIR_NETDEV_VPORT_PROFILE_OP_RESTORE, flags=flags@entry=2) at qemu/qemu_process.c:3365 #2 0x00007f76146c25a0 in qemuDomainSaveImageStartVM (conn=conn@entry=0x7f7608000ad0, driver=driver@entry=0x7f760c009440, vm=vm@entry=0x7f760c2097d0, fd=fd@entry=0x7f761882fa7c, header=header@entry=0x7f761882fa90, path=path@entry=0x7f7600000a90 "/home/lcapitulino/work/src/upstream/libvirt/foobar", start_paused=start_paused@entry=false) at qemu/qemu_driver.c:4843 #3 0x00007f76146c35c6 in qemuDomainRestoreFlags (conn=0x7f7608000ad0, path=0x7f7600000a90 "/home/lcapitulino/work/src/upstream/libvirt/foobar", dxml=<optimized out>, flags=<optimized out>) at qemu/qemu_driver.c:4962 #4 0x00007f762393923b in virDomainRestore (conn=0x7f7608000ad0, from=0x7f76000008c0 "/home/lcapitulino/work/src/upstream/libvirt/foobar") at libvirt.c:2768 #5 0x00007f7624365691 in remoteDispatchDomainRestore (server=<optimized out>, msg=<optimized out>, args=0x7f7600000900, rerr=0x7f761882fcd0, client=0x7f76253b9150) at remote_dispatch.h:4679 #6 remoteDispatchDomainRestoreHelper (server=<optimized out>, client=0x7f76253b9150, msg=<optimized out>, rerr=0x7f761882fcd0, args=0x7f7600000900, ret=<optimized out>) at remote_dispatch.h:4661 #7 0x00007f76239a4d56 in virNetServerProgramDispatchCall (msg=0x7f76253b8700, client=0x7f76253b9150, server=0x7f76253b23f0, prog=0x7f76253bd070) at rpc/virnetserverprogram.c:439 #8 virNetServerProgramDispatch (prog=0x7f76253bd070, server=server@entry=0x7f76253b23f0, client=0x7f76253b9150, msg=0x7f76253b8700) at rpc/virnetserverprogram.c:305 #9 0x00007f76239a0338 in virNetServerProcessMsg (msg=<optimized out>, prog=<optimized out>, client=<optimized out>, srv=0x7f76253b23f0) at rpc/virnetserver.c:162 #10 virNetServerHandleJob (jobOpaque=<optimized out>, opaque=0x7f76253b23f0) at rpc/virnetserver.c:183 #11 0x00007f76238c20ee in virThreadPoolWorker (opaque=opaque@entry=0x7f76253bd230) at util/virthreadpool.c:144 #12 0x00007f76238c1766 in virThreadHelper (data=<optimized out>) at util/virthreadpthread.c:161 #13 0x00007f76227ffd15 in start_thread (arg=0x7f7618830700) at pthread_create.c:308 #14 0x00007f762212b48d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:114