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When matching process titles, don't attempt a match if we're out of "argv" parts

Authored by epriestley on Jun 25 2019, 10:21 PM.



Ref T13321. In general, if we try to match against "array('x', 'y')" and there's an "array('x')" process, we may run out of arguments before matching the whole pattern.

On Ubuntu, there are a bunch of system processes which look like [khugepaged] in ps. These have no /proc/123/cmdline, so we end up with an empty "argv", which is causing us to hit the bug. Just let this be for now, we don't currently care about these processes.

Test Plan

Ran bin/phd status on Ubuntu.

Diff Detail

rPHU libphutil
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.