uvm_fault(0xffffffff8392de70, 0xffff800021d12004, 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
*254323  74501      0           0  0x4000000    0  syz-executor
ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279
VOP_LOOKUP(fffffd806694ccd0,ffff80002a799c68,ffff80002a799c98) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
vfs_lookup(ffff80002a799c38) at vfs_lookup+0x961 sys/kern/vfs_lookup.c:567
namei(ffff80002a799c38) at namei+0x7ca sys/kern/vfs_lookup.c:250
domknodat(ffff80002f8c2d18,ffffff9c,200000000000,2000,6381) at domknodat+0xb4 sys/kern/vfs_syscalls.c:1611
syscall(ffff80002a799e20) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a799e20) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xa922be2c8c0, 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(0xffffffff8392de70, 0xffff800021d12004, 0, 1) -> d
ddb> trace
ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279
VOP_LOOKUP(fffffd806694ccd0,ffff80002a799c68,ffff80002a799c98) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
vfs_lookup(ffff80002a799c38) at vfs_lookup+0x961 sys/kern/vfs_lookup.c:567
namei(ffff80002a799c38) at namei+0x7ca sys/kern/vfs_lookup.c:250
domknodat(ffff80002f8c2d18,ffffff9c,200000000000,2000,6381) at domknodat+0xb4 sys/kern/vfs_syscalls.c:1611
syscall(ffff80002a799e20) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a799e20) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xa922be2c8c0, count: -7
ddb>