Horton

BF mamba failure

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Cc: Peter Smith <smithpb2250@gmail.com>
Date: 2023-03-18T04:11:59Z
Lists: pgsql-hackers 
Hi,

Peter Smith has recently reported a BF failure [1]. AFAICS, the call
stack of failure [2] is as follows:

0x1e66644 <ExceptionalCondition+0x8c> at postgres
0x1d0143c <pgstat_release_entry_ref+0x4c0> at postgres
0x1d02534 <pgstat_get_entry_ref+0x780> at postgres
0x1cfb120 <pgstat_prep_pending_entry+0x8c> at postgres
0x1cfd590 <pgstat_report_disconnect+0x34> at postgres
0x1cfbfc0 <pgstat_shutdown_hook+0xd4> at postgres
0x1ca7b08 <shmem_exit+0x7c> at postgres
0x1ca7c74 <proc_exit_prepare+0x70> at postgres
0x1ca7d2c <proc_exit+0x18> at postgres
0x1cdf060 <PostgresMain+0x584> at postgres
0x1c203f4 <ServerLoop.isra.0+0x1e88> at postgres
0x1c2161c <PostmasterMain+0xfa4> at postgres
0x1edcf94 <main+0x254> at postgres

I couldn't correlate it to the recent commits. Any thoughts?

[1] - https://www.postgresql.org/message-id/CAHut%2BPsHdWFjU43VEX%2BR-8de6dFQ-_JWrsqs%3DvWek1hULexP4Q%40mail.gmail.com
[2] -
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=mamba&dt=2023-03-17%2005%3A36%3A10

-- 
With Regards,
Amit Kapila.

Commits

  1. Add information about "generation" when dropping twice pgstats entry

  2. Fix race conditions with drop of reused pgstats entries