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From: Tom Lane <tgl@sss.pgh.pa.us>
To: noriyoshi.shinoda@hpe.com
cc: pgsql-bugs@lists.postgresql.org, Andres Freund <andres@anarazel.de>
Subject: Re: BUG #16754: When using LLVM and parallel queries aborted all
 session by pg_cancel_backend.
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References: <16754-4a800d382f5cfae9@postgresql.org>
Comments: In-reply-to PG Bug reporting form <noreply@postgresql.org>
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Date: Tue, 01 Dec 2020 15:58:43 -0500
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PG Bug reporting form <noreply@postgresql.org> writes:
> SELECT pg_cancel_backend(130342);
> ...
> 2020-12-01 14:26:02.337 JST [130270] LOG:  background worker "parallel
> worker" (PID 130342) was terminated by signal 11: Segmentation fault
> 2020-12-01 14:26:02.337 JST [130270] DETAIL:  Failed process was running:
> EXPLAIN ANALYZE SELECT * FROM data1 d1, data1 d2;

FWIW, I failed to reproduce any crash here, using RHEL8 (llvm-10.0.1).
I don't see any plausibly-related commits since 13.1, so it's not
something we recently fixed.  I wonder if this is an LLVM bug fixed
since the 7.1 release you have.

			regards, tom lane