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[Hyper-V] LIS daemons fail to start after disable/re-enable VM
Status in linux package in Ubuntu:
Status in linux source package in Xenial:
Status in linux source package in Zesty:
Issue description: Hyper-V daemons fail to start after disable/re-
enable VM integration services.
Platform: host independent
Affected daemons - KVP, FCOPY and VSS.
Distribution name and release: Ubuntu 16.04, Ubuntu 17.04
Kernel version: 4.11.0-rc7-next-20170421 (for Ubuntu 16.04),
4.10.0-19-generic (for Ubuntu 17.04)
Repro rate: 100%
Steps to reproduce:
1. Start VM with Guest Services enabled (FCopy daemon starts automatically)
2. Go to File > Settings > Integration Services, uncheck Guest Services
and apply (FCopy daemon will stop at this point)
3. Re-enable Guest Services from VM Settings (Fcopy daemon is not running).
This is the issue. systemd monitors for the service and if we have the hook
for the Guest Service, it tries to start the daemon again.
systemd attempt to start any of the LIS daemons will fail, but manually
executing the daemon binary, it will start the daemon.
- the steps above can be repro'd with KVP / Data Exchange integration service
- Manually starting hv_fcopy_daemon works fine.
- other distros (RHEL) does not have this behavior, the LIS daemons are
started automatically by systemd once we re-enable the integration service.
On the upstream kernel and the upstream hv daemons, these messages are
recorded in syslog, once we re-enable the Guest service:
HV_FCOPY: pread failed: Bad file descriptor
systemd: hv-fcopy-daemon.service: Main process exited, code=exited,
systemd: hv-fcopy-daemon.service: Unit entered failed state.
systemd: hv-fcopy-daemon.service: Failed with result 'exit-code'.
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