On Thu, 2014-04-10 at 14:55 +0200, Marcin Gibuła wrote: > Hi, > > I've been playing with QEMU 2.0-rc2 and found a crash that isn't there > in 1.7.1. Hi Marcin, Thanks for reporting the bug!
Do you have a development environment? If you do, and the reproduction is fast (and you already have a setup), a git bisect to find the problematic commit would be appreciated, Thanks, Marcel > > Virtual machine is created via libvirt and when I query it with > 'dommemstat' it crashes with following backtrace: > > Program received signal SIGSEGV, Segmentation fault. > 0x00007f5883655c0a in object_class_dynamic_cast (class=0x7f588618fbb0, > typename=typename@entry=0x7f58837ebe54 "object") at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qom/object.c:525 > 525 > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qom/object.c: > > No such file or directory. > (gdb) bt > #0 0x00007f5883655c0a in object_class_dynamic_cast > (class=0x7f588618fbb0, typename=typename@entry=0x7f58837ebe54 "object") > at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qom/object.c:525 > #1 0x00007f5883655da5 in object_dynamic_cast (obj=0x7f58861604c0, > typename=typename@entry=0x7f58837ebe54 "object") at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qom/object.c:456 > #2 0x00007f5883657d6e in object_resolve_abs_path (parent=<optimized > out>, parts=parts@entry=0x7f5886352ad0, > typename=typename@entry=0x7f58837ebe54 "object", index=index@entry=1) > at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qom/object.c:1244 > #3 0x00007f5883657f20 in object_resolve_path_type (path=<optimized > out>, typename=0x7f58837ebe54 "object", ambiguous=0x7fff1ccab257) at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qom/object.c:1312 > #4 0x00007f5883652d7f in qmp_qom_list (path=0x7f588615c9a0 > "//machine/i440fx/pci.0/child[9]", errp=errp@entry=0x7fff1ccab290) at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qmp.c:201 > #5 0x00007f588364dd55 in qmp_marshal_input_qom_list (mon=<optimized > out>, qdict=<optimized out>, ret=0x7fff1ccab310) at qmp-marshal.c:2490 > #6 0x00007f58836ef4e8 in qmp_call_cmd (params=0x7f58893626b0, > mon=0x7f5885c9ec90, cmd=<optimized out>) at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/monitor.c:4760 > #7 handle_qmp_command (parser=<optimized out>, tokens=<optimized out>) > at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/monitor.c:4826 > #8 0x00007f588378289a in json_message_process_token > (lexer=0x7f5885ca00a0, token=0x7f58861a0500, type=JSON_OPERATOR, x=95, > y=20) at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qobject/json-streamer.c:87 > #9 0x00007f5883797c4f in json_lexer_feed_char > (lexer=lexer@entry=0x7f5885ca00a0, ch=125 '}', flush=flush@entry=false) > at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qobject/json-lexer.c:303 > #10 0x00007f5883797d96 in json_lexer_feed (lexer=0x7f5885ca00a0, > buffer=<optimized out>, size=<optimized out>) at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qobject/json-lexer.c:356 > #11 0x00007f5883782ab1 in json_message_parser_feed (parser=<optimized > out>, buffer=<optimized out>, size=<optimized out>) at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qobject/json-streamer.c:110 > #12 0x00007f58836ed593 in monitor_control_read (opaque=<optimized out>, > buf=<optimized out>, size=<optimized out>) at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/monitor.c:4847 > #13 0x00007f588363d4e1 in qemu_chr_be_write (len=<optimized out>, > buf=0x7fff1ccab4f0 "}", s=0x7f5885caf0b0) at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qemu-char.c:165 > #14 tcp_chr_read (chan=<optimized out>, cond=<optimized out>, > opaque=0x7f5885caf0b0) at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/qemu-char.c:2487 > #15 0x00007f58814d0b75 in g_main_context_dispatch () from > /usr/lib64/libglib-2.0.so.0 > #16 0x00007f588360b0e8 in glib_pollfds_poll () at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/main-loop.c:190 > #17 os_host_main_loop_wait (timeout=<optimized out>) at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/main-loop.c:235 > #18 main_loop_wait (nonblocking=<optimized out>) at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/main-loop.c:484 > #19 0x00007f58834dbb6e in main_loop () at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/vl.c:2051 > #20 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized > out>) at > /var/tmp/portage/app-emulation/qemu-2.0.0_rc2/work/qemu-2.0.0-rc2/vl.c:4507 > > Virtual machine options command line: > > LC_ALL=C > PATH=/bin:/sbin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin > > HOME=/ USER=root QEMU_AUDIO_DRV=none /usr/bin/qemu-kvm -name > f1b3b8b7-7b0e-4eab-afef-06d577d6544d -S -machine > pc-i440fx-2.0,accel=kvm,usb=off -cpu SandyBridge,-kvmclock -m 4096 > -realtime mlock=on -smp 4,sockets=2,cores=10,threads=1 -uuid > f1b3b8b7-7b0e-4eab-afef-06d577d6544d -smbios type=0,vendor=HAL 9000 > -smbios type=1,manufacturer=cloud -no-user-config -nodefaults -chardev > socket,id=charmonitor,path=/var/lib/libvirt/qemu/f1b3b8b7-7b0e-4eab-afef-06d577d6544d.monitor,server,nowait > > -mon chardev=charmonitor,id=monitor,mode=control -rtc > base=utc,clock=vm,driftfix=slew -global kvm-pit.lost_tick_policy=discard > -no-shutdown -boot menu=off,strict=on -device > piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device > virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x4 -drive > file=/mnt/nfs/volumes/16162d6c-88c9-4052-9ae0-dccdd914a891/active.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=threads,bps_rd=68157440,bps_wr=68157440,iops_rd=325,iops_wr=325 > > -device > virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=2 > > -drive if=none,id=drive-ide0-0-0,readonly=on,format=raw -device > ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 > -netdev tap,fd=26,id=hostnet0,vhost=on,vhostfd=27 -device > virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:46:0d:c9,bus=pci.0,addr=0x3 > > -chardev pty,id=charserial0 -device > isa-serial,chardev=charserial0,id=serial0 -chardev > socket,id=charchannel0,path=/var/lib/libvirt/qemu/f1b3b8b7-7b0e-4eab-afef-06d577d6544d.agent,server,nowait > > -device > virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 > > -chardev > socket,id=charchannel1,path=/var/lib/libvirt/qemu/f1b3b8b7-7b0e-4eab-afef-06d577d6544d.cloud.agent,server,nowait > > -device > virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=com.cloud.guest_agent.1 > > -device usb-tablet,id=input0 -vnc 0.0.0.0:3,password -device > cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device > virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -sandbox on -device > pvpanic >
