Prior to PG16, postmaster children would manually detach from shared memory if it was not needed. However, this behavior was removed in fork mode in commit aafc05d. Detaching shared memory when it is no longer needed is beneficial, as postmaster children (like syslogger) don't wish to take any risk of accidentally corrupting shared memory. Additionally, any panic in these processes will not reset shared memory. The attached patch addresses this issue by detaching shared memory after fork_process(). Best regard, Rui Zhao
0001-Detach-shared-memory-in-Postmaster-child-if-not-needed.patch
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