[Bug 1926596] [NEW] qemu-monitor-event command stukcs randomly

[Ganesh Gosavi]

Public bug reported:

We are using kvm virtualization on our servers, We use 
"qemu-monitor-command"(drive-backup) to take qcow2 backups and to monitor them 
we use "qemu-monitor-event" command 
For eg:-
/usr/bin/virsh qemu-monitor-event VPSNAME --event 
"BLOCK_JOB_COMPLETED\|BLOCK_JOB_ERROR" --regex

the above command stucks randomly (backup completes but still it is
waiting) and because of which other vms backup are stucked until we kill
that process.

Can you suggest how can we debug this further to find the actual issue.


/usr/bin/virsh version

Compiled against library: libvirt 4.5.0
Using library: libvirt 4.5.0
Using API: QEMU 4.5.0
Running hypervisor: QEMU 2.0.0

cat /etc/os-release
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/";
BUG_REPORT_URL="https://bugs.centos.org/";

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1926596

Title:
  qemu-monitor-event command stukcs randomly

Status in QEMU:
  New

Bug description:
  We are using kvm virtualization on our servers, We use 
"qemu-monitor-command"(drive-backup) to take qcow2 backups and to monitor them 
we use "qemu-monitor-event" command 
  For eg:-
  /usr/bin/virsh qemu-monitor-event VPSNAME --event 
"BLOCK_JOB_COMPLETED\|BLOCK_JOB_ERROR" --regex

  the above command stucks randomly (backup completes but still it is
  waiting) and because of which other vms backup are stucked until we
  kill that process.

  Can you suggest how can we debug this further to find the actual
  issue.

  
  /usr/bin/virsh version

  Compiled against library: libvirt 4.5.0
  Using library: libvirt 4.5.0
  Using API: QEMU 4.5.0
  Running hypervisor: QEMU 2.0.0

  cat /etc/os-release
  NAME="CentOS Linux"
  VERSION="7 (Core)"
  ID="centos"
  ID_LIKE="rhel fedora"
  VERSION_ID="7"
  PRETTY_NAME="CentOS Linux 7 (Core)"
  ANSI_COLOR="0;31"
  CPE_NAME="cpe:/o:centos:centos:7"
  HOME_URL="https://www.centos.org/";
  BUG_REPORT_URL="https://bugs.centos.org/";

  CENTOS_MANTISBT_PROJECT="CentOS-7"
  CENTOS_MANTISBT_PROJECT_VERSION="7"
  REDHAT_SUPPORT_PRODUCT="centos"
  REDHAT_SUPPORT_PRODUCT_VERSION="7"

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