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Sighting: background timed event causes event thread to hang (not execute any events)

Only seen once, that I'm aware of, on git.synchro.net:

2023-10-15T05:01:54.655820-07:00 git sbbs: evnt LNXBUILD Running native background timed event: LNXBUILD
2023-10-15T05:01:54.655846-07:00 git sbbs: evnt LNXBUILD Executing external: /sbbs/exec/jsexec testbuild.js -cov-token=secret

After I noticed no event where running on git, I recycled it:

2023-10-15T20:53:22.904438-07:00 git sbbs: evnt BBS Events JavaScript: Destroying context
2023-10-15T20:53:22.910952-07:00 git sbbs: evnt BBS Events JavaScript: Destroying runtime
2023-10-15T20:53:22.912066-07:00 git sbbs: evnt BBS Events BBS Events thread terminated

Conspicuously absent was the "Detaching external process" log message and it appears the event process (jsexec in this case) didn't actually run.

Just previous to this occurrence, a successful background execution looks like this in the log:

2023-10-15T04:00:00.745122-07:00 git sbbs: evnt STBUILD Running native background timed event: STBUILD
2023-10-15T04:00:00.745164-07:00 git sbbs: evnt STBUILD Executing external: /sbbs/exec/jsexec synctermbuild
2023-10-15T04:00:00.805042-07:00 git sbbs: evnt STBUILD Detaching external process