Comment # 1 on bug 1065556 from Dr. Werner Fink

What tool/package tty-clock is?

/suse/werner> sudo zypper se tty-clock
Loading repository data...
Reading installed packages...
No matching items found.

/suse/werner> cat /etc/os-release 
NAME="openSUSE Tumbleweed"
# VERSION="20171023"
ID=opensuse
ID_LIKE="suse"
VERSION_ID="20171023"
PRETTY_NAME="openSUSE Tumbleweed"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:tumbleweed:20171023"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"

and what about a valid core dump with gdb back trace?