system.uptime stays at 0 after Vituozzo 7 Kernel Update (zabbix-agent 3.0 and 3.2)

[KervyN]

Hi,
can someone tell me how system.uptime is collected?
We updated the Kernel in Virtuozzo 7 and the zabbix-agentd inside the guests now reports system.uptime with value 0.
The host still got the right uptime.

  Host: test-ubuntu-1604 (guest)
  uname -r: 4.2.0-327.36.1.vz7.20.18
  cat /proc/uptime: 4102.54 8161.06
  zabbix_agentd -V: zabbix_agentd (daemon) (Zabbix) 3.0.1 Revision 58734 26 February 2016, compilation time: Apr  8 2016 12:15:36
  system.uptime: 0

  Host: test-ubuntu-1404 (guest)
  uname -r: 3.10.0-327.36.1.vz7.20.18
  cat /proc/uptime: 1473.02 8786.81
  zabbix_agentd -V: zabbix_agentd (daemon) (Zabbix) 3.2.3 Revision 64610 21 December 2016, compilation time: Dec 21 2016 13:52:42
  system.uptime: 0

  Host: test-virtuozzo-7 (host)
  uname -r: 3.10.0-327.36.1.vz7.20.18
  cat /proc/uptime: 966618.50 15309985.87
  zabbix_agentd -V: zabbix_agentd (daemon) (Zabbix) 3.2.3 Revision 64610 21 December 2016, compilation time: Dec 21 2016 13:37:14
  system.uptime: 967387

Any Ideas?

[KervyN]

It seems to be n Issue with openVZ / Virtuozzo 7.
We compiled a this script [1] and have the same problem.

[1] https://gist.github.com/KervyN/64fe4...a035fcb0667d0e

We are going to contact our Odin TAM and will keep you up2date.

Best regards
Kervyn

[KervyN]

We reported the issue to Odin. Here is their answer:

It appears to be a kernel issue, indeed.

The uptime is calculated properly, however the function ‘do_sysinfo()’ calls few notifiers after uptime calculation, and one of them zeroes the resulting structure. (Check “kernel/sys.c” in the sources, ‘do_sysinfo()’ calls ‘virtinfo_notifier_call()’; it used to be before uptime calculation in Virtuozzo 6, see “kernel/time.c” for details.)


The issue has been reported to developers as PSBM-62094, to be fixed in the future kernels.

For now, you can read “/proc/uptime” instead, it is not affected.