Re: Segmentation fault with core dump

>
> That would result in nonsensical gdb output, most likely; but Glauco's
> trace is internally consistent enough that I doubt gdb is lying to us.
> In any case, the crash is an observable fact :-(
>
>
> The system is a CentOS 7, and PG was installed using PGDG's YUM repository.

We are pretty sure that the same binary that crashed was using on `gdb`
command. More specifically, the path used was
`/usr/pgsql-9.6/bin/postmaster`, and we were running 9.6.6 (most recent 9.6
minor release today) for a few weeks, so there shouldn't have any upgrade
on the binaries since the server was up, specially because we restarted the
service in order to allow core dump creation, this is not the first crash
(although the only one with core dump generated so far), we can send new
gdb stack if it happens again.

More information:
$ uname -a
Linux pg-iii.br 3.10.0-514.10.2.el7.x86_64 #1 SMP Fri Mar 3 00:04:05 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux

$ /usr/pgsql-9.6/bin/pg_config
BINDIR = /usr/pgsql-9.6/bin
DOCDIR = /usr/pgsql-9.6/doc
HTMLDIR = /usr/pgsql-9.6/doc/html
INCLUDEDIR = /usr/pgsql-9.6/include
PKGINCLUDEDIR = /usr/pgsql-9.6/include
INCLUDEDIR-SERVER = /usr/pgsql-9.6/include/server
LIBDIR = /usr/pgsql-9.6/lib
PKGLIBDIR = /usr/pgsql-9.6/lib
LOCALEDIR = /usr/pgsql-9.6/share/locale
MANDIR = /usr/pgsql-9.6/share/man
SHAREDIR = /usr/pgsql-9.6/share
SYSCONFDIR = /etc/sysconfig/pgsql
PGXS = /usr/pgsql-9.6/lib/pgxs/src/makefiles/pgxs.mk
CONFIGURE = '--enable-rpath' '--prefix=/usr/pgsql-9.6'
'--includedir=/usr/pgsql-9.6/include' '--mandir=/usr/pgsql-9.6/share/man'
'--datadir=/usr/pgsql-9.6/share' '--libdir=/usr/pgsql-9.6/lib'
'--with-perl' '--with-python' '--with-tcl' '--with-tclconfig=/usr/lib64'
'--with-openssl' '--with-pam' '--with-gssapi'
'--with-includes=/usr/include' '--with-libraries=/usr/lib64' '--enable-nls'
'--enable-dtrace' '--with-uuid=e2fs' '--with-libxml' '--with-libxslt'
'--with-ldap' '--with-selinux' '--with-systemd'
'--with-system-tzdata=/usr/share/zoneinfo'
'--sysconfdir=/etc/sysconfig/pgsql' '--docdir=/usr/pgsql-9.6/doc'
'--htmldir=/usr/pgsql-9.6/doc/html' 'CFLAGS=-O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
--param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic'
'LDFLAGS=-Wl,--as-needed'
CC = gcc
CPPFLAGS = -DFRONTEND -D_GNU_SOURCE -I/usr/include/libxml2 -I/usr/include
CFLAGS = -Wall -Wmissing-prototypes -Wpointer-arith
-Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute
-Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard
-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches
-m64 -mtune=generic
CFLAGS_SL = -fPIC
LDFLAGS = -L../../src/common -Wl,--as-needed -L/usr/lib64 -Wl,--as-needed
-Wl,-rpath,'/usr/pgsql-9.6/lib',--enable-new-dtags
LDFLAGS_EX =
LDFLAGS_SL =
LIBS = -lpgcommon -lpgport -lselinux -lxslt -lxml2 -lpam -lssl -lcrypto
-lgssapi_krb5 -lz -lreadline -lrt -lcrypt -ldl -lm
VERSION = PostgreSQL 9.6.6

Regards,
Glauco