Обсуждение: BUG #18364: psql execution error: Segmentation fault

The following bug has been logged on the website:

Bug reference:      18364
Logged by:          George Gustavo Mirocha
Email address:      gmirocha@gmail.com
PostgreSQL version: 16.2
Operating system:   RHEL 8 & CENTOS 7
Description:

After upgrade Postgresql from 16.1 to 16.2 in both CENTOS 7 and RHEL 8 I'm
getting the segmentation fault error when I try to execute any "\" command
on psql. I have got this error in different hosts, plataforms, etc.

-bash-4.2$ psql
psql (16.2)
Type "help" for help.

postgres=# \l
Segmentation fault

------------- Execution with DEBUG:
postgres=# \l

Program received signal SIGSEGV, Segmentation fault.
slash_yylex (yylval_param=yylval_param@entry=0x0, yyscanner=0x6e2300) at
psqlscanslash.c:1312
1312                    *yy_cp = yyg->yy_hold_char;
(gdb)

PG Bug reporting form <noreply@postgresql.org> writes:
> After upgrade Postgresql from 16.1 to 16.2 in both CENTOS 7 and RHEL 8 I'm
> getting the segmentation fault error when I try to execute any "\" command
> on psql. I have got this error in different hosts, plataforms, etc.

Given the location of the error, it seems like you might have a
problem with inconsistent ABI for "flex".  I'm not quite sure
how you'd get there, because that's usually pretty self-contained.
(Once there was a "libfl.a" that could possibly cause this sort of
problem, but I don't think that exists in modern flex versions.)
Anyway, I'd check that you have a consistent installation of flex
and then rebuild Postgres from source.

            regards, tom lane