Horton

Re: PG17.6 wal apply bug (SIGSEGV)

Peter Geoghegan <pg@bowt.ie>

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From: Peter Geoghegan <pg@bowt.ie>
To: "badfilez@gmail.com" <badfilez@gmail.com>
Cc: pgsql-bugs@lists.postgresql.org
Date: 2025-10-20T17:18:12Z
Lists: pgsql-bugs 
On Mon, Oct 20, 2025 at 1:07 PM badfilez@gmail.com <badfilez@gmail.com> wrote:
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  0x000000000057eff2 in _bt_restore_page (page=0x7f6f48fd1000 "", from=0x7f6fe2eccd80 "", len=<optimized out>) at nbtxlog.c:63
> 63            itemsz = MAXALIGN(itemsz);
> (gdb) bt full

"itemsz = 0" suggests that the index was already corrupt, before the
WAL record is applied.

I suggest that you use contrib/amcheck (or the pg_amcheck frontend
program) to ascertain the extent of any index corruption on this
database.

-- 
Peter Geoghegan