run exits shortly after startup

[sentience]

In Murmur, running event_framework in the foreground causes the server to be killed shortly after startup:

> bin/projectors run
⋮
[1]    55389 killed     bin/projectors run

but starting it to run in the background keeps the server running successfully:

> bin/projectors start
⋮
murmur_projectors: process with pid 55871 started.

> bin/projectors status
⋮
murmur_projectors: running [pid 55871]

Update: The background process is not actually running successfully; it's just continually crashing and restarting. From the log file:

Domains::SurveyDesign::Projectors::SectionCodesCommandProjector
objc[19301]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called.
objc[19301]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.
I, [2023-10-24T12:29:44.209171 #16381]  INFO -- : Domains::SurveyDesign::Projectors::SectionCodesCommandProjector terminated
E, [2023-10-24T12:29:44.211669 #16381] ERROR -- : Restarting

[sentience]

A couple of potential fixes here: rails/rails#38560

Update: Tried them without success.

[sentience]

OK, managed to get the Murmur projectors running using the OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES work-around described for macOS forking issues in a few places:

> spring stop
Spring is not running

> export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES

> tail -f log/murmur_projectors.log &
⋮ log output begins

> bin/projectors start
⋮
murmur_projectors: process with pid 49445 started.

⋮ log output shows projectors running normally

> bin/projectors stop
⋮ log output shows projectors shutting down normally
murmur_projectors: process with pid 49445 successfully stopped.

> kill %1
[1]  + 49226 terminated  tail -f log/murmur_projectors.log  

The process still crashes (with no apparent error message) when not launched as a daemon:

> spring stop
Spring is not running

> export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES

> bin/projectors run
⋮
[1]    55389 killed     bin/projectors run

If we can't find a fix for this, we should probably update Murmur's Procfile and setup instructions to run the projectors manually as daemons.