centreon_plugins.exe can hang forever

[UrBnW]

Hi,

centreon_plugins.exe, called by NSClient++, can hang forever, accumulating processes and memory consumption on the monitored Windows machine.

Below is the faulty behaviour we discovered with an unpatched Net::NTP (see #25 and https://github.com/centreon/centreon-plugins/issues/2129). But seems to be a more general issue, as I tend to demonstrate below.

With following nsclient.ini configuration :

[/settings/external scripts]
timeout=10

And using centreon_plugins.pl --plugin=apps::protocols::nrpe::plugin --custommode=nsclient --new-api ... as client (should be the case with other clients too).

When launching the centreon_plugins.pl command, we see 2 new centreon_plugins.exe processes appearing :

10 seconds later, the centreon_plugins.pl returns with the following : Command check_centreon_plugins didn't terminate within the timeout period 10s Additional --debug gives : {"command":"check_centreon_plugins","lines":[{"message":"Command check_centreon_plugins didn't terminate within the timeout period 10s","perf":{}}],"result":3}

And on Windows side, one of the 2 processes disappears, for sure killed by NSClient++ :

Unfortunately, as you can see, the bigger one remains, and it hangs forever. So seems like NSclient++ does its job killing the external command, perhaps there's an issue with signal handling / forwarding in centreon_plugins.exe itself.

Even with a dummy sleep in the plugin's code as a really simple test case, the second process does not get killed.

Thx 👍