Race during the process self-termination and terminate via supervisor

[juise]

Describe the bug
In case process (gen_server) terminates with {stop, normal, ...} and the supervisor tries to stop it at the same time via terminate function, it's possible in rare cases to get:

   supervisor: {local,my_sup}
   errorContext: shutdown_error
   reason: noproc
   offender: [{pid,<0.4890.1539>},
              {id,my},
              {mfargs,{my,start_link,[]}},
              {restart_type,temporary},
              {shutdown,5000},
              {child_type,worker}]
(supervisor:do_terminate/2)

see http://erlang.org/pipermail/erlang-questions/2021-September/101433.html

To Reproduce
Create processes with a high rate, do self-termination and simultaneously terminate via supervisor.

Expected behavior
When a process terminates with a normal reason, the supervisor which tries to terminate it at the same time (monitors it), should get the real termination reason, not a 'noproc' reason.

Affected versions
OTP-23.2.5

Additional context
http://erlang.org/pipermail/erlang-questions/2021-September/101433.html

[rickard-green]

Now fixed in the just released OTP 24.1.1 patch.