uvm_fault(0xffffffff83aacff0, 0xffff80001ffc2004, 0, 1) -> d
kernel: page fault trap, code=0
Stopped at      ufs_lookup+0x613:       movzwl  0x4(%r15,%r14,1),%ebx
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*346079    619      0           0  0x4000000    0  syz-executor
ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279
VOP_LOOKUP(fffffa0077792da8,ffff80003a4db838,ffff80003a4db868) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
vfs_lookup(ffff80003a4db808) at vfs_lookup+0x94a sys/kern/vfs_lookup.c:580
namei(ffff80003a4db808) at namei+0x7c3 sys/kern/vfs_lookup.c:250
domknodat(ffff80002a766a70,ffffff9c,200000000280,2000,1e60) at domknodat+0xb4 sys/kern/vfs_syscalls.c:1531
syscall(ffff80003a4db9f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003a4db9f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf543e46eb10, count: 8
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.
ddb> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xffffffff83aacff0, 0xffff80001ffc2004, 0, 1) -> d
ddb> show kasan
No such command
ddb>