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Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Steps To Reproduce:
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Install MDB server via either DEB file / TGZ file / or apt package manager.

Run a chown 444 on the dbpath your mongod is using

Core Dump

In actual practice, this is largely missed on DEB / apt installs, since both create the necessary dir with correct permissions. But this will spring on many TGZ initial installations, and will likely surface for the package manager / DEB installations during initial configuration, especially if admins seek to use custom users to run their mongod instances.
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Install MDB server via either DEB file / TGZ file / or apt package manager. Run a chown 444 on the dbpath your mongod is using Core Dump In actual practice, this is largely missed on DEB / apt installs, since both create the necessary dir with correct permissions. But this will spring on many TGZ initial installations, and will likely surface for the package manager / DEB installations during initial configuration, especially if admins seek to use custom users to run their mongod instances.
Sprint:
Service arch 2020-10-05, Service arch 2020-11-02, Service arch 2020-11-16, Service arch 2020-11-30

Attempting to spin up a v3.6.20-rc2 mongod reliably core dumps if either:

This does not match expected behavior, where an error is instead thrown and the server terminates gracefully.

See attached repro file. All it takes is a chmod 444 on the dbpath to core dump the next mongod start attempt.

Participants:: Andrew Feierabend, Connie Chen, Eric Sedor, Gabriel Russell, Githook User