A thread must reach the end of it's code block OR return, for it to end properly. I would suspect that
my $retval = `/usr/bin/snmpget -v1 -c <commstring> $ip sysDescr.0`;
is hanging, and stoping the flow of the code. Is there someway to set a timeout on it, or wrap it in an eval? Alarms don't work well in threads, but you could try running a parallel thread to act as a timer, and run the snmpget command thru a piped-open or IPC::Open3 so you get a pid that
can be killed when the timer times out.
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