[ 209.5014535] KUBSan: Undefined behavior in /usr/src/sys/kern/kern_ubsan.c:140:23, left shift of negative value -1
[ 209.5014535] KUBSan: Undefined behavior in /usr/src/sys/kern/kern_exit.c:671:13, left shift of negative value -1

Report by Harry Pantazis (luserx0)