Re: BUG #18974: Postgresql repeatable crash after pg_upgrade from 15 to 17.5 version in postgresql_fdw queries

On Wed, Jul 2, 2025 at 1:09 AM PG Bug reporting form <noreply@postgresql.org> wrote:

The following bug has been logged on the website:

Bug reference:      18974
Logged by:          Maxim Boguk
Email address:      maxim.boguk@gmail.com
PostgreSQL version: 17.5
Operating system:   Ubuntu
Description:       

Postgresql repeatable crash after pg_upgrade from 15 to 17.5 version in
postgresql_fdw timeouted (via query_timeout) queries
Backtrace data from core file:
Core was generated by `postgres: 17/main: **.app **_data [local] SELECT
'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  __strcmp_evex () at ../sysdeps/x86_64/multiarch/strcmp-evex.S:314
warning: 314    ../sysdeps/x86_64/multiarch/strcmp-evex.S: No such file or
directory
(gdb) bt
#0  __strcmp_evex () at ../sysdeps/x86_64/multiarch/strcmp-evex.S:314
#1  0x0000780820fd2df7 in emitHostIdentityInfo (conn=0x5d89b19f6d80,
host_addr=0x7ffd34c50c70 "10.100.103.4") at

(gdb) print ((PGconn *)0x5d89b19f6d80)->connhost[0]
$14 = {type = CHT_HOST_NAME, host = 0x0, hostaddr = 0x5d89b19c53b0 "10.100.103.4", port = 0x5d89b19c5390 "6503", password = 0x0}

As a result displayed_host = conn->connhost[conn->whichhost].host = 0x0

and crash in line strcmp(displayed_host, host_addr) != 0

related FDW definition:

FDW options          | ( dbname '****', hostaddr '10.100.103.4', port '6503')