Re: Logical replication 'invalid memory alloc request size 1585837200' after upgrading to 17.5

From: Alexander Lakhin <exclusion(at)gmail(dot)com>
To: Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>
Cc: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>, Duncan Sands <duncan(dot)sands(at)deepbluecap(dot)com>, "pgsql-bugs(at)lists(dot)postgresql(dot)org" <pgsql-bugs(at)lists(dot)postgresql(dot)org>
Subject: Re: Logical replication 'invalid memory alloc request size 1585837200' after upgrading to 17.5
Date: 2025-06-20 05:00:00
Message-ID: dbf561f7-465e-4086-adfa-733b9b9a34b3@gmail.com
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Hello Sawada-san,

17.06.2025 20:40, Masahiko Sawada wrote:
> Pushed the fix (d87d07b7ad3). Thank you for working on this fix.

As buildfarm [1] shows, the test case added to invalidation_distribution
with 1230be12f fails against -DCLOBBER_CACHE_ALWAYS on REL_13_STABLE:
diff -U3
/home/buildfarm/trilobite/buildroot/REL_13_STABLE/pgsql.build/contrib/test_decoding/expected/invalidation_distribution.out
/home/buildfarm/trilobite/buildroot/REL_13_STABLE/pgsql.build/contrib/test_decoding/output_iso/results/invalidation_distribution.out
---
/home/buildfarm/trilobite/buildroot/REL_13_STABLE/pgsql.build/contrib/test_decoding/expected/invalidation_distribution.out
2025-06-17 10:24:24.382768613 +0200
+++
/home/buildfarm/trilobite/buildroot/REL_13_STABLE/pgsql.build/contrib/test_decoding/output_iso/results/invalidation_distribution.out
2025-06-17 15:01:53.921913314 +0200
@@ -31,7 +31,7 @@
 step s2_get_binary_changes: SELECT count(data) FROM pg_logical_slot_get_binary_changes('isolation_slot', NULL, NULL,
'proto_version', '1', 'publication_names', 'pub') WHERE get_byte(data, 0) = 73;
 count
 -----
-    0
+    1
 (1 row)

 ?column?

I could reproduce this locally and also checked that the test passes on
REL_14_STABLE and master.

Could you look at this, please?

[1] https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=trilobite&dt=2025-06-17%2008%3A24%3A00

Best regards,
Alexander

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