semantic: 0.218 device: 0.095 graphic: 0.093 other: 0.093 debug: 0.088 vnc: 0.085 permissions: 0.058 PID: 0.053 socket: 0.050 network: 0.039 boot: 0.037 files: 0.035 performance: 0.035 KVM: 0.023 debug: 0.729 performance: 0.049 other: 0.034 files: 0.034 PID: 0.028 device: 0.026 KVM: 0.022 network: 0.020 semantic: 0.016 socket: 0.012 graphic: 0.009 boot: 0.009 vnc: 0.007 permissions: 0.006 qemu core dumps with -serial mon:vc qemu 1.5.2-1 dumps core when asked to put the monitor on a virtual console. For example, suppose you want to monitor the second serial port, you might try something like: qemu-system-x86_64 -serial null -serial mon:vc But that creates a core dump. In fact, even re-creating what should be the default dumps core: $ qemu-system-x86_64 -serial mon:vc:80Cx25C Segmentation fault (core dumped) I'm not including a backtrace because the bug is so easy to reproduce, but I can provide more info if necessary. Hi, This problem has been solved by commit 7b7ab18d0b9769b5f39e663fa55caed461b1202e: Author: Michael Roth