Thanks for the fix. I re-compiled latest master(#f82f1fe1af2853e5d152afb950a3421b61410250). Seeing this issue, Info : FreeRADIUS Version 4.0.0 Info : Copyright 1999-2020 The FreeRADIUS server project and contributors Info : There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A Info : PARTICULAR PURPOSE Info : You may redistribute copies of FreeRADIUS under the terms of the Info : GNU General Public License Info : For more information about these matters, see the file named COPYRIGHT Info : Starting - reading configuration files ... Debug : Including dictionary file "/etc/raddb/dictionary" including configuration file /etc/raddb/radiusd.conf Including files in directory "/etc/raddb/template.d/" including configuration file /etc/raddb/template.d/default including configuration file /etc/raddb/clients.conf Including files in directory "/etc/raddb/mods-enabled/" including configuration file /etc/raddb/mods-enabled/always including configuration file /etc/raddb/mods-enabled/dhcpv4 including configuration file /etc/raddb/mods-enabled/expr ... ... CAUGHT SIGNAL: Segmentation fault Backtrace of last 17 frames: /usr/lib64/freeradius/libfreeradius-util.so(fr_fault+0x1ba)[0x7f013ec601ba] /lib64/libpthread.so.0(+0xf630)[0x7f013d4ad630] /usr/lib64/freeradius/rlm_perl.so(+0x3f67)[0x7f0136242f67] /usr/lib64/freeradius/rlm_perl.so(+0x4158)[0x7f0136243158] /usr/lib64/freeradius/libfreeradius-server.so(+0x32ed7)[0x7f013f384ed7] /lib64/libtalloc.so.2(talloc_free_children+0x5ce)[0x7f013e36ef4e] /usr/lib64/freeradius/libfreeradius-server.so(+0x32b39)[0x7f013f384b39] /lib64/libtalloc.so.2(talloc_free_children+0x5ce)[0x7f013e36ef4e] /usr/lib64/freeradius/libfreeradius-server.so(+0x43b4c)[0x7f013f395b4c] /lib64/libtalloc.so.2(+0x383b)[0x7f013e36883b] /usr/lib64/freeradius/libfreeradius-server.so(+0x436b4)[0x7f013f3956b4] /usr/lib64/freeradius/libfreeradius-util.so(rbtree_walk+0x8a)[0x7f013ec82b6a] /usr/lib64/freeradius/libfreeradius-server.so(modules_free+0x23)[0x7f013f3973e3] /usr/lib64/freeradius/libfreeradius-server.so(server_free+0x13)[0x7f013f3684b3] /usr/sbin/radiusd(main+0x739)[0x404529] /lib64/libc.so.6(__libc_start_main+0xf5)[0x7f013cc7b555] /usr/sbin/radiusd[0x40514f] No panic action set _EXIT(139) CALLED src/lib/util/debug.c[996]. Last error was: Unknown attribute 'DHCP-IP-Address-Lease-Time'