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Commit4518c798blocks signals for a short region of code, but it assumed that whatever called it had the signal mask set to UnBlockSig on entry. That may be true today (or may even not be, in extensions in the wild), but it would be better not to make that assumption. We should save-and-restore the caller's signal mask. The PG_SETMASK() portability macro couldn't be used for that, which is why it wasn't done before. But... considering that commita65e0864established back in 9.6 that supported POSIX systems have sigprocmask(), and that this is POSIX-only code, there is no reason not to use standard sigprocmask() directly to achieve that. Back-patch to all supported releases, like4518c798and80845b7c. Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CA%2BhUKGKx6Biq7_UuV0kn9DW%2B8QWcpJC1qwhizdtD9tN-fn0H0g%40mail.gmail.com