[Pkg-nagios-devel] Bug#943888: check_libs: ignores deleted mmaped files

[Felix Geyer]

Package: nagios-plugins-contrib
Version: 17.20161211

check_libs doesn't report processes that have mmaped files which have 
been deleted in the meantime.
Importantly that includes libraries that have been upgraded.

To reproduce on buster with systemd (but obviously applies to other 
processes as well):
apt install --reinstall libseccomp2
# /usr/lib/nagios/plugins/check_libs
No upgraded libs linked in running processes

This is caused by on overly aggressive optimization introduced in the 
lsof-speedup patch here:
https://salsa.debian.org/nagios-team/pkg-nagios-plugins-contrib/commit/cd5eacf4faa9f81ec82d57befd44bf6d623c7e26#24f6022115d4e658ca493136b4c17be4fc7e0537_8_8

When reverting that patch to (removing -a +L1)
 > my $LSOF = '/usr/bin/lsof -nPF0';

it correctly reports systemd processes

# /usr/lib/nagios/plugins/check_libs
The following processes have libs linked that were upgraded: root: 
(sd-pam) (544), systemd (1, 543), [...]

-- 
Felix Geyer
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