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If users haven't configured guest agent then qemuAgentCommand() will dereference a NULL 'mon' pointer, which causes crash of libvirtd when using agent based cpu (un)plug. With the patch, when the qemu-ga service isn't running in the guest, a expected error "error: Guest agent is not responding: Guest agent not available for now" will be raised, and the error "error: argument unsupported: QEMU guest agent is not configured" is raised when the guest hasn't configured guest agent. GDB backtrace: (gdb) bt #0 virNetServerFatalSignal (sig=11, siginfo=<value optimized out>, context=<value optimized out>) at rpc/virnetserver.c:326 #1 <signal handler called> #2 qemuAgentCommand (mon=0x0, cmd=0x7f39300017b0, reply=0x7f394b090910, seconds=-2) at qemu/qemu_agent.c:975 #3 0x00007f39429507f6 in qemuAgentGetVCPUs (mon=0x0, info=0x7f394b0909b8) at qemu/qemu_agent.c:1475 #4 0x00007f39429d9857 in qemuDomainGetVcpusFlags (dom=<value optimized out>, flags=9) at qemu/qemu_driver.c:4849 #5 0x00007f3957dffd8d in virDomainGetVcpusFlags (domain=0x7f39300009c0, flags=8) at libvirt.c:9843 How to reproduce? # To start a guest without guest agent configuration # then run the following cmdline # virsh vcpucount foobar --guest error: End of file while reading data: Input/output error error: One or more references were leaked after disconnect from the hypervisor error: Failed to reconnect to the hypervisor RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=984821 Signed-off-by: Alex Jia <ajia@redhat.com> Signed-off-by: Peter Krempa <pkrempa@redhat.com> |
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| .. | ||
| libvirtd_qemu.aug | ||
| MIGRATION.txt | ||
| qemu_agent.c | ||
| qemu_agent.h | ||
| qemu_bridge_filter.c | ||
| qemu_bridge_filter.h | ||
| qemu_capabilities.c | ||
| qemu_capabilities.h | ||
| qemu_cgroup.c | ||
| qemu_cgroup.h | ||
| qemu_command.c | ||
| qemu_command.h | ||
| qemu_conf.c | ||
| qemu_conf.h | ||
| qemu_domain.c | ||
| qemu_domain.h | ||
| qemu_driver.c | ||
| qemu_driver.h | ||
| qemu_hostdev.c | ||
| qemu_hostdev.h | ||
| qemu_hotplug.c | ||
| qemu_hotplug.h | ||
| qemu_migration.c | ||
| qemu_migration.h | ||
| qemu_monitor_json.c | ||
| qemu_monitor_json.h | ||
| qemu_monitor_text.c | ||
| qemu_monitor_text.h | ||
| qemu_monitor.c | ||
| qemu_monitor.h | ||
| qemu_process.c | ||
| qemu_process.h | ||
| qemu.conf | ||
| test_libvirtd_qemu.aug.in | ||
| THREADS.txt | ||