uvm_fault(0xffffffff83933440, 0xffff800029082004, 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
*188023  15167      0           0  0x4000000    0  syz-executor
ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279
VOP_LOOKUP(fffffd807bd98540,ffff80002a799560,ffff80002a799590) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
vfs_lookup(ffff80002a799530) at vfs_lookup+0x961 sys/kern/vfs_lookup.c:567
namei(ffff80002a799530) at namei+0x7ca sys/kern/vfs_lookup.c:250
vn_open(ffff80002a799530,207,0) at vn_open+0x22e sys/kern/vfs_vnops.c:109
doopenat(ffff80002a786fa0,ffffff9c,200000000180,206,0,0,686142521b843cc2) at doopenat+0x352 sys/kern/vfs_syscalls.c:1155
sys_open(ffff80002a786fa0,ffff80002a7997d0,ffff80002a799720) at sys_open+0x59 sys/kern/vfs_syscalls.c:1063
syscall(ffff80002a7997d0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a7997d0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb2fef016580, count: 6
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(0xffffffff83933440, 0xffff800029082004, 0, 1) -> d
ddb>