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Alright I am back with my logs. The first Authentication Failure and coredump you see is after I failed to enter the first password. The second failure is after I entered the first password successfully and then failed on the second password.
Oct 24 21:46:09 pig systemd[1]: Started Getty on tty2.
-- Subject: Unit getty@tty2.service has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit getty@tty2.service has finished starting up.
--
-- The start-up result is done.
Oct 24 21:46:14 pig login[29759]: pam_access(login:account): authentication failure; logname=LOGIN uid=0 euid=0 tty=tty2 ruser= rhost= user=milo
Oct 24 21:46:14 pig login[29759]: Authentication failure
Oct 24 21:46:17 pig systemd[1]: getty@tty2.service: Service has no hold-off time, scheduling restart.
Oct 24 21:46:17 pig systemd[1]: Stopped Getty on tty2.
-- Subject: Unit getty@tty2.service has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit getty@tty2.service has finished shutting down.
Oct 24 21:46:17 pig systemd[1]: Started Getty on tty2.
-- Subject: Unit getty@tty2.service has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit getty@tty2.service has finished starting up.
--
-- The start-up result is done.
Oct 24 21:47:40 pig login[29776]: pam_unix(login:auth): authentication failure; logname=LOGIN uid=0 euid=0 tty=tty2 ruser= rhost= user=milo
Oct 24 21:47:42 pig login[29776]: FAILED LOGIN 1 FROM tty2 FOR milo, Authentication failure
Oct 24 21:47:42 pig kernel: login[29776]: segfault at 0 ip 00007f9a2e4fad2e sp 00007ffeb2814eb0 error 4 in libc-2.24.so[7f9a2e478000+195000]
Oct 24 21:47:42 pig systemd[1]: Started Process Core Dump (PID 29843/UID 0).
-- Subject: Unit systemd-coredump@1-29843-0.service has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit systemd-coredump@1-29843-0.service has finished starting up.
--
-- The start-up result is done.
Oct 24 21:47:42 pig systemd[1]: getty@tty2.service: Service has no hold-off time, scheduling restart.
Oct 24 21:47:42 pig systemd[1]: Stopped Getty on tty2.
-- Subject: Unit getty@tty2.service has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit getty@tty2.service has finished shutting down.
Oct 24 21:47:42 pig systemd-coredump[29844]: Process 29776 (login) of user 0 dumped core.
Stack trace of thread 29776:
#0 0x00007f9a2e4fad2e __strstr_sse2 (libc.so.6)
#1 0x00007f9a2ec31dec pam_authenticate (libgrubd.so)
#2 0x0000000000403e97 n/a (login)
#3 0x00007f9a2e498291 __libc_start_main (libc.so.6)
#4 0x0000000000404a2a n/a (login)
-- Subject: Process 29776 (login) dumped core
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- Documentation: man:core(5)
--
-- Process 29776 (login) crashed and dumped core.
--
-- This usually indicates a programming error in the crashing program and
-- should be reported to its vendor as a bug.
Oct 24 21:47:42 pig systemd[1]: Started Getty on tty2.
-- Subject: Unit getty@tty2.service has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit getty@tty2.service has finished starting up.
--
-- The start-up result is done.
Oct 24 21:47:48 pig login[29846]: pam_access(login:account): authentication failure; logname=LOGIN uid=0 euid=0 tty=tty2 ruser= rhost= user=milo
Oct 24 21:47:48 pig login[29846]: Authentication failure
Oct 24 21:47:51 pig systemd[1]: getty@tty2.service: Service has no hold-off time, scheduling restart.
Oct 24 21:47:51 pig systemd[1]: Stopped Getty on tty2.
-- Subject: Unit getty@tty2.service has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit getty@tty2.service has finished shutting down.
Oct 24 21:47:51 pig systemd[1]: Started Getty on tty2.
-- Subject: Unit getty@tty2.service has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit getty@tty2.service has finished starting up.
--
-- The start-up result is done.Maybe this will help diagnose the issue..
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