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Description of problem:
2 VMs both with <shareable/> configured for same source image in usb bus can not start at the same time
Version-Release number of selected component (if applicable):
libvirt-3.9.0-6.el7.x86_64
kernel-3.10.0-820.el7.x86_64
qemu-kvm-rhev-2.10.0-12.el7.x86_64
How reproducible:
100%
Steps to Reproduce:
1. Prepare 2 shutdown VM with the following configuration
# virsh domstate test1
shut off
# virsh domstate test2
shut off
# virsh dumpxml test1 --inactive|grep "<disk" -A6
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/var/lib/libvirt/images/RHEL-7.5-x86_64-latest.img'/>
<target dev='hda' bus='usb'/>
<shareable/>
<address type='usb' bus='0' port='3'/>
</disk>
# virsh dumpxml test2 --inactive|grep "<disk" -A6
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/var/lib/libvirt/images/RHEL-7.5-x86_64-latest.img'/>
<target dev='hda' bus='usb'/>
<shareable/>
<address type='usb' bus='0' port='3'/>
</disk>
2. Try to start 2 VMs
# virsh start test1
Domain test1 started
# ps -ef |grep test1 |sed 's/-device/\n-device/g'
qemu 4943 1 1 11:47 ? 00:00:01 /usr/libexec/qemu-kvm -name guest=test1
-drive file=/var/lib/libvirt/images/RHEL-7.5-x86_64-latest.img,format=raw,if=none,id=drive-usb-disk0,cache=none
-device usb-storage,bus=usb.0,port=3,share-rw=on,drive=drive-usb-disk0,id=usb-disk0,bootindex=1,removable=off -netdev tap,fd=27,id=hostnet0
# virsh start test2
error: Failed to start domain test2
error: internal error: qemu unexpectedly closed the monitor: profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-virbuffer.gcda:Cannot open
profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-virbitmap.gcda:Cannot open
profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-virauthconfig.gcda:Cannot open
profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-virauth.gcda:Cannot open
profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-viraudit.gcda:Cannot open
profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-virarch.gcda:Cannot open
profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-viralloc.gcda:Cannot open
2017-12-13T03:14:35.670317Z qemu-kvm: -device usb-storage,bus=usb.0,port=3,share-rw=on,drive=drive-usb-disk0,id=usb-disk0,bootindex=1,removable=off: Failed to get shared "write" lock
Is another process using the image?
Actual results:
2 VMs both with <shareable/> configured for same source image in usb bus can not start at the same time, and while 'share-rw=on' already shows in the error info
Expected results:
2 VMs both with <shareable/> configured for same source image in usb bus can start at the same time
Additional info:
Under same condition with above, 2 VMs both with IDE bus or SCSI bus can work well.
Failed to boot up 2 guests with 'share-rw=on' appeding on virtio scsi/block disks, so the bug is not must usb-storage related.
# /usr/libexec/qemu-kvm -name 'avocado-vt-vm1' -device virtio-scsi-pci,id=virtio_scsi_pci0,bus=pci.0 -drive id=drive_image2,if=none,snapshot=off,aio=native,cache=none,format=qcow2,file=/home/win10-32-virtio-scsi.qcow2 -device scsi-hd,id=image1,drive=drive_image2,bootindex=1,share-rw=on -vnc :20 -monitor stdio -cpu 'SandyBridge',+kvm_pv_unhalt,hv_relaxed,hv_spinlocks=0x1fff,hv_vapic,hv_time
qemu-kvm: -drive id=drive_image2,if=none,snapshot=off,aio=native,cache=none,format=qcow2,file=/home/win10-32-virtio-scsi.qcow2: Failed to get "write" lock
Is another process using the image?
# /usr/libexec/qemu-kvm -name 'avocado-vt-vm1' -drive id=drive_image1,if=none,snapshot=off,aio=native,cache=none,format=qcow2,file=/home/win10-32-virtio-scsi.qcow2 -device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=0,bus=pci.0,share-rw=on -vnc :20 -monitor stdio -cpu 'SandyBridge',+kvm_pv_unhalt,hv_relaxed,hv_spinlocks=0x1fff,hv_vapic,hv_time
qemu-kvm: -drive id=drive_image1,if=none,snapshot=off,aio=native,cache=none,format=qcow2,file=/home/win10-32-virtio-scsi.qcow2: Failed to get "write" lock
Is another process using the image?
Comment 10Miroslav Rezanina
2018-02-02 12:40:12 UTC
Verify the bug on following sw versions:
Host kernel: 3.10.0-843.el7.x86_64
Qemu-kvm-rhev: qemu-kvm-rhev-2.10.0-19.el7.x86_64
2 guests could boot up with the same raw disk image as usb storage disk with 'share-rw=on appended:
-drive id=drive_image2,if=none,snapshot=off,aio=threads,cache=none,format=raw,file=/home/hd1.raw -device usb-storage,id=image2,drive=drive_image2,share-rw=on,bootindex=2,bus=usbtest.0 \
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2018:1104
Description of problem: 2 VMs both with <shareable/> configured for same source image in usb bus can not start at the same time Version-Release number of selected component (if applicable): libvirt-3.9.0-6.el7.x86_64 kernel-3.10.0-820.el7.x86_64 qemu-kvm-rhev-2.10.0-12.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. Prepare 2 shutdown VM with the following configuration # virsh domstate test1 shut off # virsh domstate test2 shut off # virsh dumpxml test1 --inactive|grep "<disk" -A6 <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/var/lib/libvirt/images/RHEL-7.5-x86_64-latest.img'/> <target dev='hda' bus='usb'/> <shareable/> <address type='usb' bus='0' port='3'/> </disk> # virsh dumpxml test2 --inactive|grep "<disk" -A6 <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/var/lib/libvirt/images/RHEL-7.5-x86_64-latest.img'/> <target dev='hda' bus='usb'/> <shareable/> <address type='usb' bus='0' port='3'/> </disk> 2. Try to start 2 VMs # virsh start test1 Domain test1 started # ps -ef |grep test1 |sed 's/-device/\n-device/g' qemu 4943 1 1 11:47 ? 00:00:01 /usr/libexec/qemu-kvm -name guest=test1 -drive file=/var/lib/libvirt/images/RHEL-7.5-x86_64-latest.img,format=raw,if=none,id=drive-usb-disk0,cache=none -device usb-storage,bus=usb.0,port=3,share-rw=on,drive=drive-usb-disk0,id=usb-disk0,bootindex=1,removable=off -netdev tap,fd=27,id=hostnet0 # virsh start test2 error: Failed to start domain test2 error: internal error: qemu unexpectedly closed the monitor: profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-virbuffer.gcda:Cannot open profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-virbitmap.gcda:Cannot open profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-virauthconfig.gcda:Cannot open profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-virauth.gcda:Cannot open profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-viraudit.gcda:Cannot open profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-virarch.gcda:Cannot open profiling:/builddir/build/BUILD/libvirt-3.9.0/src/util/.libs/libvirt_util_la-viralloc.gcda:Cannot open 2017-12-13T03:14:35.670317Z qemu-kvm: -device usb-storage,bus=usb.0,port=3,share-rw=on,drive=drive-usb-disk0,id=usb-disk0,bootindex=1,removable=off: Failed to get shared "write" lock Is another process using the image? Actual results: 2 VMs both with <shareable/> configured for same source image in usb bus can not start at the same time, and while 'share-rw=on' already shows in the error info Expected results: 2 VMs both with <shareable/> configured for same source image in usb bus can start at the same time Additional info: Under same condition with above, 2 VMs both with IDE bus or SCSI bus can work well.