Opening a socket with the name of a device file can not work, you've got to specify a different name for a unix socket instead. So this is not a bug.
** Changed in: qemu Status: New => Invalid -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1381879 Title: can not run vm with a serial port Status in QEMU: Invalid Bug description: environment: server: centOS 6.5, 3.14.19, x86_64 qemu-kvm: QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2), Copyright (c) 2003-2008 Fabrice Bellard qemu-system-x86_64 :QEMU emulator version 1.2.0 (qemu-kvm-1.2.0), Copyright (c) 2003-2008 Fabrice Bellard virt-manager: 0.9.0 VM: centOS 6.5, 3.12.30, x86_64 reproduce step: 1. add serial device 2. select device type: unix socket device parameters: path=/dev/ttyS0 mode=client mode(connect) 3. run the VM phenomenon: Error starting domain: internal error process exited while connecting to monitor: qemu-kvm: -chardev socket,id=charserial0,path=/dev/ttyS0,server,nowait: socket bind failed: Address already in use qemu-kvm: -chardev socket,id=charserial0,path=/dev/ttyS0,server,nowait: chardev: opening backend "socket" failed Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 44, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/asyncjob.py", line 65, in tmpcb callback(*args, **kwargs) File "/usr/share/virt-manager/virtManager/domain.py", line 1114, in startup self._backend.create() File "/usr/lib64/python2.6/site-packages/libvirt.py", line 678, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: internal error process exited while connecting to monitor: qemu-kvm: -chardev socket,id=charserial0,path=/dev/ttyS0,server,nowait: socket bind failed: Address already in use qemu-kvm: -chardev socket,id=charserial0,path=/dev/ttyS0,server,nowait: chardev: opening backend "socket" failed To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1381879/+subscriptions