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VM shuts down due to error in qemu block.c
On a Trusty KVM host one of the guest VMs shut down without any user interaction. The system is running:
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.5 LTS"
$ dpkg -l libvirt0 qemu-kvm qemu-system-common qemu-system-x86
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-============================================================-===================================-===================================-==============================================================================================================================
ii libvirt0 1.2.2-0ubuntu13.1.17 amd64 library for interfacing with different virtualization systems
ii qemu-kvm 2.0.0+dfsg-2ubuntu1.27 amd64 QEMU Full virtualization
ii qemu-system-common 2.0.0+dfsg-2ubuntu1.27 amd64 QEMU full system emulation binaries (common files)
ii qemu-system-x86 2.0.0+dfsg-2ubuntu1.27 amd64 QEMU full system emulation binaries (x86)
In the VMs log in /var/lib/libvirt/qemu/hostname we see:
2016-11-17 09:18:42.603+0000: starting up
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -name hostname,process=qemu:hostname -S -machine pc-i440fx-trusty,accel=kvm,usb=off -m 12697 -realtime mlock=off -smp 4,sockets=4,cores=1,threads=1 -uuid 51766564-ed8e-41aa-91b5-574220af4ac3 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/hostname.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/dev/disk1/hostname,if=none,id=drive-virtio-disk0,format=raw -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive file=/dev/disk2/hostname_mnt_data,if=none,id=drive-virtio-disk1,format=raw -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk1,id=virtio-disk1 -drive file=/dev/disk1/hostname_tmp,if=none,id=drive-virtio-disk2,format=raw -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x8,drive=drive-virtio-disk2,id=virtio-disk2 -netdev tap,fd=24,id=hostnet0,vhost=on,vhostfd=30 -device virtio-net-pci,tx=bh,netdev=hostnet0,id=net0,mac=52:54:00:45:e7:d9,bus=pci.0,addr=0x6 -netdev tap,fd=31,id=hostnet1,vhost=on,vhostfd=32 -device virtio-net-pci,tx=bh,netdev=hostnet1,id=net1,mac=52:54:00:f6:6c:77,bus=pci.0,addr=0x7 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -vnc 0.0.0.0:5 -device VGA,id=video0,bus=pci.0,addr=0x2 -device AC97,id=sound0,bus=pci.0,addr=0x3 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x9
char device redirected to /dev/pts/6 (label charserial0)
qemu-system-x86_64: /build/qemu-PVxDqC/qemu-2.0.0+dfsg/block.c:3491: bdrv_error_action: Assertion `error >= 0' failed.
2016-12-22 09:49:49.392+0000: shutting down
In /var/lib/libvirt/libvirtd.log we see:
2016-12-22 09:49:49.298+0000: 6946: error : qemuMonitorIO:656 : internal error: End of file from monitor
We investigated to see if this is a known issue and came across a bug report for Fedora (https://bugzilla.redhat.com/show_bug.cgi?id=1147398), but nothing references changes upstream that fix this.
The guest OS is Ubuntu Precise (12.04.5) running kernel linux-image-3.2.0-101-virtual 3.2.0-101.141. There wasn't any significant load (CPU or IO) on the guest at the time that it shut down and there wasn't any appreciable disk IO on the KVM host either. The disks for the guest are on the KVM host box.
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