kvm crashes during snapshot creation

[Davide Guerri]

Whenever I try to take an internal snapshot with libvirt, kvm crashes with a segfault.

I'm using Ubuntu Quantal, qemu-kvm version: 1.2.0 libvirt version: 0.9.13

For instance:

virsh # snapshot-create-as 00000_00000_Guerri_VD test
error: Unable to read from monitor: Connection reset by peer

Logs except:

==> libvirt/qemu/00000_00000_Guerri_VD.log <==
*** glibc detected *** /usr/bin/kvm: free(): invalid pointer: 0x00007f1ab8000a00 ***

==> syslog <==
Feb 13 22:47:54 kvm02 kernel: [39570.605558] kvm[16192]: segfault at 8 ip 00007f1ac615e512 sp 00007f1a25f07cf0 error 4 in libc-2.15.so[7f1ac60de000+1b5000]

==> apport.log <==
ERROR: apport (pid 16214) Wed Feb 13 22:47:54 2013: called for pid 15445, signal 11, core limit 0
ERROR: apport (pid 16214) Wed Feb 13 22:47:54 2013: executable: /usr/bin/qemu-system-x86_64 (command line "/usr/bin/kvm -name 00000_00000_Guerri_VD -S -M pc-1.0 -cpu Westmere,+rdtscp,+pdpe1gb,+dca,+xtpr,+tm2,+est,+vmx,+ds_cpl,+monitor,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme -enable-kvm -m 2048 -smp 2,sockets=2,cores=1,threads=1 -uuid 731decda-0e70-caf1-03c1-f7ff1e2db455 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/00000_00000_Guerri_VD.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime -no-shutdown -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x7 -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/nfs/qn1-raidset1/00000_00000_Guerri_VD.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=native -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive if=none,id=drive-ide0-1-0,readonly=on,format=raw,cache=none,aio=native -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=42,id=hostnet0,vhost=on,vhostfd=43 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:38:f3:a6,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -vnc 0.0.0.0:0 -k it -vga cirrus -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6")
ERROR: apport (pid 16214) Wed Feb 13 22:47:54 2013: is_closing_session(): no DBUS_SESSION_BUS_ADDRESS in environment
ERROR: apport (pid 16214) Wed Feb 13 22:47:55 2013: this executable already crashed 2 times, ignoring

[Davide Guerri (davide-guerri)]

If domain is saved before taking the snapshot, all works as expected

virsh # save 00000_00000_Guerri_VD /tmp/vmsave

Domain 00000_00000_Guerri_VD saved to /tmp/vmsave

virsh # snapshot-create-as 00000_00000_Guerri_VD test
Domain snapshot test created

virsh # restore /tmp/vmsave
Domain restored from /tmp/vmsave

virsh # snapshot-list 00000_00000_Guerri_VD
 Name Creation Time State
------------------------------------------------------------
 test 2013-02-13 23:38:43 +0100 shutoff

[Serge Hallyn (serge-hallyn)]

Is there any chance you'd be able to test whether this is fixed in raring?

[Davide Guerri (davide-guerri)]

I don't have a raring instance atm.

 I'd like to try a backport of KVM 1.3. Is this available (beta)?

[Serge Hallyn (serge-hallyn)]

Hi Davide,

I've built a version of qemu 1.3 in ppa:serge-hallyn/virt.

[Launchpad Janitor (janitor)]

[Expired for qemu-kvm (Ubuntu) because there has been no activity for 60 days.]

[Dean Kamali (dean-kamali)]

I'm having the same issue with Ubuntu 12.04.2 LTS, every time I try and take snapshot I get the following error.

error: Unable to read from monitor: Connection reset by peer

Then the virtual mechine shuts down, and qemu log for that vm shows

 *** glibc detected *** /usr/bin/kvm: free(): invalid pointer: 0x00007f2368000a00 ***

is there is a fix?

Thank you