uvm_fault(0xffffffff83a1e8b0, 0xffff800028ce200c, 0, 1) -> d
kernel: page fault trap, code=0
Stopped at      ufs_direnter+0x23b:     movl    0(%r14),%r15d
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*273821  93803      0        0x10  0x4000000    0  syz-executor
ufs_direnter(fffffd8075ed5a20,fffffd806ac7d008,ffff80002a7970d8,ffff80002a797438,0) at ufs_direnter+0x23b sys/ufs/ufs/ufs_lookup.c:764
ufs_makeinode(2000,fffffd8075ed5a20,ffff80002a797408,ffff80002a797438) at ufs_makeinode+0x51b sys/ufs/ufs/ufs_vnops.c:1768
ufs_mknod(ffff80002a7972b0) at ufs_mknod+0x5b sys/ufs/ufs/ufs_vnops.c:167
VOP_MKNOD(fffffd8075ed5a20,ffff80002a797408,ffff80002a797438,ffff80002a797338) at VOP_MKNOD+0x101 sys/kern/vfs_vops.c:121
domknodat(ffff80002a777238,ffffff9c,200000000280,2000,5d4a) at domknodat+0x469 sys/kern/vfs_syscalls.c:1659
syscall(ffff80002a7975c0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a7975c0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x123a14727b0, 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(0xffffffff83a1e8b0, 0xffff800028ce200c, 0, 1) -> d
ddb> trace
ufs_direnter(fffffd8075ed5a20,fffffd806ac7d008,ffff80002a7970d8,ffff80002a797438,0) at ufs_direnter+0x23b sys/ufs/ufs/ufs_lookup.c:764
ufs_makeinode(2000,fffffd8075ed5a20,ffff80002a797408,ffff80002a797438) at ufs_makeinode+0x51b sys/ufs/ufs/ufs_vnops.c:1768
ufs_mknod(ffff80002a7972b0) at ufs_mknod+0x5b sys/ufs/ufs/ufs_vnops.c:167
VOP_MKNOD(fffffd8075ed5a20,ffff80002a797408,ffff80002a797438,ffff80002a797338) at VOP_MKNOD+0x101 sys/kern/vfs_vops.c:121
domknodat(ffff80002a777238,ffffff9c,200000000280,2000,5d4a) at domknodat+0x469 sys/kern/vfs_syscalls.c:1659
syscall(ffff80002a7975c0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a7975c0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x123a14727b0, count: -7
ddb> show registers
rdi                                0
rsi                                0
rbp               0xffff80002a7970c0
rbx               0xfffffd8007ffd680
rdx               0xffff8000015d6200
rcx                            0x602
rax               0xffff80002a777238
r8                0xffffffffffffffff
r9                                 0
r10               0x918fc6b54542239b
r11               0x9472b8d09d844466
r12               0xfffffd800a212400
r13               0xfffffd807d1dba00
r14               0xffff800028ce200c
r15                                0
rip               0xffffffff819fc30b    ufs_direnter+0x23b
cs                               0x8
rflags                       0x10246    __ALIGN_SIZE+0xf246
rsp               0xffff80002a797020
ss                              0x10
ufs_direnter+0x23b:     movl    0(%r14),%r15d
ddb> show proc
PROC (syz-executor) tid=273821 pid=93803 tcnt=2 stat=onproc
    flags process=10<SUGID> proc=4000000<THREAD>
    runpri=17, usrpri=50, slppri=17, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff80002a7767d8,0xffff80002a776fb0
    process=0xffff80002ed1f620 user=0xffff80002a792000, vmspace=0xfffffd807ece1cf0
    estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb>