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When a command is killed by a timeout, make the human-readable error more clear
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Authored by epriestley on Fri, Nov 16, 5:11 PM.

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Summary

Ref T13216. When we kill commands ourself because they exceed their time limit, it isn't always clear what happened. The error code (137 = kill, 143 = term) is usually a good hint if you know exactly what you're looking for, but this is totally non-obvious to anyone who isn't very familiar with the internals.

Instead, check if we killed the subprocess and make it clear what happened in the error message.

Test Plan
2018-11-16 9:07:53 AM [STDE] [2018-11-16 09:07:52] EXCEPTION: (PhutilProxyException) Task "138492" encountered a permanent failure and was cancelled. {>} (PhabricatorWorkerPermanentFailureException) Permanent failure while activating resource ("PHID-DRYR-bv5p57tk5y7vcqonrgj3"): Command killed by timeout after running for more than 0.001 seconds.

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rPHU libphutil
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