Date: Tue, 3 Aug 2021 08:10:09 -0500
From: Justin Pryzby <pryzby@telsasoft.com>
To: Nitin Jadhav <nitinjadhavpostgres@gmail.com>
Cc: Robert Haas <robertmhaas@gmail.com>,
	Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>,
	Tom Lane <tgl@sss.pgh.pa.us>, Andres Freund <andres@anarazel.de>,
	Stephen Frost <sfrost@snowman.net>,
	Magnus Hagander <magnus@hagander.net>,
	Thomas Munro <thomas.munro@gmail.com>, pgsql-hackers@postgresql.org
Subject: Re: when the startup process doesn't (logging startup delays)
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Two issues that I saw:

The first syncfs message is not output, because it's before
InitStartupProgress() is called:

2021-08-03 07:53:02.176 CDT startup[9717] LOG:  database system was interrupted; last known up at 2021-08-03 07:52:15 CDT
2021-08-03 07:53:02.733 CDT startup[9717] LOG:  data directory sync (syncfs) complete after 0.55 s
2021-08-03 07:53:02.734 CDT startup[9717] LOG:  database system was not properly shut down; automatic recovery in progress

FP exception when the GUC is set to 0:

2021-08-03 07:53:02.877 CDT postmaster[9715] LOG:  startup process (PID 9717) was terminated by signal 8: Floating point exception

Probably due to mod zero operation.
This prevents the process from starting.

+       enable_timeout_after(LOG_STARTUP_PROGRESS_TIMEOUT,
+                                                (interval_in_ms - (elapsed_ms % interval_in_ms)));

-- 
Justin