[Qemu-devel] [Bug 1810400] Re: Failed to make dirty bitmaps writable: Can't update bitmap directory: Operation not permitted

[John Snow]

Acknowledged; target is 4.2.

Vladimir Sementsov-Ogievskiy has some patches in-flight that seek to
correct block commit behavior with bitmaps:
https://lists.gnu.org/archive/html/qemu-devel/2019-08/msg01160.html


** Changed in: qemu
       Status: New => Confirmed

** Changed in: qemu
     Assignee: (unassigned) => John Snow (jnsnow)

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https://bugs.launchpad.net/bugs/1810400

Title:
   Failed to make dirty bitmaps writable: Can't update bitmap directory:
  Operation not permitted

Status in QEMU:
  Confirmed

Bug description:
  blockcommit does not work if there is dirty block.

  virsh version
  Compiled against library: libvirt 4.10.0
  Using library: libvirt 4.10.0
  Using API: QEMU 4.10.0
  Running hypervisor: QEMU 2.12.0

  Scenario:
  1. Create an instance
  2. Add dirty bitmap to vm disk.
  3. create a snapshot(external or internal)
  4. revert snapshot or blockcommit disk

  virsh blockcommit rota-test vda  --active
  Active Block Commit started

  virsh blockjob rota-test vda --info
  No current block job for vda

  
  rota-test.log:
   starting up libvirt version: 4.10.0, package: 1.el7 (CBS <address@hidden>, 
2018-12-05-12:27:12, c1bk.rdu2.centos.org), qemu version: 
2.12.0qemu-kvm-ev-2.12.0-18.el7_6.1.1, kernel: 4.1.12-103.9.7.el7uek.x86_64, 
hostname: vm-kvm07
  LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin 
QEMU_AUDIO_DRV=spice /usr/libexec/qemu-kvm -name 
guest=rota-test,debug-threads=on -S -object 
secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-101-rota-test/master-key.aes
 -machine pc-i440fx-rhel7.0.0,accel=kvm,usb=off,dump-guest-core=off -cpu 
SandyBridge,hypervisor=on,xsaveopt=on -m 8192 -realtime mlock=off -smp 
3,sockets=3,cores=1,threads=1 -uuid 50dec55c-a80a-4adc-a788-7ba23230064e 
-no-user-config -nodefaults -chardev socket,id=charmonitor,fd=59,server,nowait 
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew 
-global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -global 
PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot strict=on -device 
ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x5.0x7 -device 
ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x5 
-device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x5.0x1 
-device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x5.0x2 
-device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 -drive 
file=/var/lib/libvirt/images/rota-0003,format=qcow2,if=none,id=drive-virtio-disk0,cache=none
 -device 
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,write-cache=on
 -netdev tap,fd=61,id=hostnet0,vhost=on,vhostfd=62 -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:e8:09:94,bus=pci.0,addr=0x3 
-chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 
-chardev spicevmc,id=charchannel0,name=vdagent -device 
virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0
 -spice port=5902,addr=0.0.0.0,disable-ticketing,seamless-migration=on -device 
qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pci.0,addr=0x2
 -chardev spicevmc,id=charredir0,name=usbredir -device 
usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=2 -chardev 
spicevmc,id=charredir1,name=usbredir -device 
usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=3 -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x8 -sandbox 
on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg 
timestamp=on
  2019-01-03T07:50:43.810142Z qemu-kvm: -chardev pty,id=charserial0: char 
device redirected to /dev/pts/3 (label charserial0)
  main_channel_link: add main channel client
  red_qxl_set_cursor_peer:
  inputs_connect: inputs channel client create
  inputs_channel_detach_tablet:
  #block339: Failed to make dirty bitmaps writable: Can't update bitmap 
directory: Operation not permitted

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