login: uvm_fault(0xffffffff83ab6968, 0xffff800029a22004, 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
* 26430  37607      0        0x10  0x4000000    0  syz-executor
ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279
VOP_LOOKUP(fffffd806de23050,ffff80002a7bbb80,ffff80002a7bbbb0) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
vfs_lookup(ffff80002a7bbb50) at vfs_lookup+0x94a sys/kern/vfs_lookup.c:580
namei(ffff80002a7bbb50) at namei+0x7c3 sys/kern/vfs_lookup.c:250
dosymlinkat(ffff80002a7734e0,200000000200,ffffff9c,200000000000) at dosymlinkat+0xef sys/kern/vfs_syscalls.c:1746
syscall(ffff80002a7bbd20) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a7bbd20) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x1c2911da400, 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(0xffffffff83ab6968, 0xffff800029a22004, 0, 1) -> d
ddb> trace
ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279
VOP_LOOKUP(fffffd806de23050,ffff80002a7bbb80,ffff80002a7bbbb0) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
vfs_lookup(ffff80002a7bbb50) at vfs_lookup+0x94a sys/kern/vfs_lookup.c:580
namei(ffff80002a7bbb50) at namei+0x7c3 sys/kern/vfs_lookup.c:250
dosymlinkat(ffff80002a7734e0,200000000200,ffffff9c,200000000000) at dosymlinkat+0xef sys/kern/vfs_syscalls.c:1746
syscall(ffff80002a7bbd20) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a7bbd20) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x1c2911da400, count: -7
ddb> show registers
rdi                                0
rsi                                0
rbp               0xffff80002a7bb8e0
rbx                                0
rdx               0xffff8000015ec3c0
rcx                       0xffffffff
rax               0xffff80002a7734e0
r8                0xffffffffffffffff
r9                0xfffffd8007ffd2d8
r10               0x2951ec25984020e2
r11               0x8ca2df10544c933f
r12               0xfffffd806ea55450
r13                                0
r14                                0
r15               0xffff800029a22000
rip               0xffffffff820623f3    ufs_lookup+0x613
cs                               0x8
rflags                       0x10246    __ALIGN_SIZE+0xf246
rsp               0xffff80002a7bb7f0
ss                              0x10
ufs_lookup+0x613:       movzwl  0x4(%r15,%r14,1),%ebx
ddb> show proc
PROC (syz-executor) tid=26430 pid=37607 tcnt=2 stat=onproc
    flags process=10<SUGID> proc=4000000<THREAD>
    runpri=32, usrpri=86, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff80002a772020,0xffff80002a773cb8
    process=0xffff8000ffffba98 user=0xffff80002a7b6000, vmspace=0xfffffd806f58c5c8
    estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0
ddb>