Segmentation Fault when exiting from su ubuntu 16.04 and 18.04

[donald-flissinger]

Hi,

I don't know where to put this topic, so I'm trying it here.

Strange segmentation fault when exiting from su,

I'm on Ubuntu Server release:
root@ubuntu-server:/home/donald# uname -a
Linux ubuntu-server.flissinger.local 4.4.0-133-generic #159-Ubuntu SMP Fri Aug 10 07:31:43 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

root@ubuntu-server:/home/donald# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.5 LTS"


dmesg gives:

[389161.916804] traps: su[64329] general protection ip:7f7295ad1cc0 sp:7fffb5301370 error:0 in libc-2.23.so[7f7295a83000+1c0000]
[389358.155893] traps: su[102473] general protection ip:7f8916169cc0 sp:7ffdd9b10250 error:0 in libc-2.23.so[7f891611b000+1c0000]
[389374.965757] traps: su[102987] general protection ip:7fcb59daacc0 sp:7ffd571f9f90 error:0 in libc-2.23.so[7fcb59d5c000+1c0000]
[390430.144714] traps: su[103041] general protection ip:7fa4b84facc0 sp:7fff7021ec10 error:0 in libc-2.23.so[7fa4b84ac000+1c0000]
[390451.290534] traps: su[108098] general protection ip:7fb296340cc0 sp:7ffd000b78f0 error:0 in libc-2.23.so[7fb2962f2000+1c0000]


root@ubuntu-server:/home/donald# exit
exit
Segmentation fault (core dumped)
donald@ubuntu-server:~$

How to debug?

Best Regards,
Donald.

edit:

Just upgraded to 18.04 LTS via do-release-upgrade but the error still persists, anyone?