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Re: v16dev: TRAP: failed Assert("size > SizeOfXLogRecord"), File: "xlog.c", Line: 1055, PID: 13564 - Mailing list pgsql-hackers

From Tom Lane
Subject Re: v16dev: TRAP: failed Assert("size > SizeOfXLogRecord"), File: "xlog.c", Line: 1055, PID: 13564
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Msg-id 2427396.1681744590@sss.pgh.pa.us
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In response to v16dev: TRAP: failed Assert("size > SizeOfXLogRecord"), File: "xlog.c", Line: 1055, PID: 13564  (Justin Pryzby <pryzby@telsasoft.com>)
Responses Re: v16dev: TRAP: failed Assert("size > SizeOfXLogRecord"), File: "xlog.c", Line: 1055, PID: 13564  (Tom Lane <tgl@sss.pgh.pa.us>)
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Justin Pryzby <pryzby@telsasoft.com> writes:
> I hit this assertion while pg_restoring data into a v16 instance.
> postgresql16-server-16-alpha_20230417_PGDG.rhel7.x86_64

> wal_level=minimal and pg_dump --single-transaction both seem to be
> required to hit the issue.

Hmm.  I wonder if log_newpages() is confused here:

    XLogEnsureRecordSpace(XLR_MAX_BLOCK_ID - 1, 0);

Why is XLR_MAX_BLOCK_ID - 1 enough, rather than XLR_MAX_BLOCK_ID?

            regards, tom lane

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