uvm_fault(0xfffffd800b027d58, 0x0, 0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff81afcf38 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a3bb760
gsbase 0xffff8000299edff0  kgsbase 0x0
panic: trap type 6, code=0, pc=ffffffff81afcf38
Starting stack trace...
panic(ffffffff833a205a) at panic+0x1d0 sys/kern/subr_prf.c:229
kerntrap(ffff80002a3bb6b0) at kerntrap+0x30b
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dt_ioctl_record_stop(ffff800001509000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586
dtclose(31e5f,81,2000,ffff80003c430d20) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline]
dtclose(31e5f,81,2000,ffff80003c430d20) at dtclose+0x109 sys/dev/dt/dt_dev.c:232
spec_close(ffff80002a3bb860) at spec_close+0x466 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd800b6abcb8,81,fffffd80097fb7b8,ffff80003c430d20) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
vn_closefile(fffffd806b91b8f8,ffff80003c430d20) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd806b91b8f8,ffff80003c430d20) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd806b91b8f8,ffff80003c430d20) at fdrop+0x121 sys/kern/kern_descrip.c:1280
closef(fffffd806b91b8f8,ffff80003c430d20) at closef+0x192 sys/kern/kern_descrip.c:1264
fdfree(ffff80003c430d20) at fdfree+0x116 sys/kern/kern_descrip.c:1195
exit1(ffff80003c430d20,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff80003c430d20,ffff80002a3bbbd0,ffff80002a3bbb20) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a3bbbd0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a3bbbd0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7a0d5c58bd10, count: 242
End of stack trace.
WARNING: SPL NOT LOWERED ON TRAP EXIT 4 0
Stopped at      proc_trampoline+0xc7:   movl    $0,%gs:0x688
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*268261  54482      0           0  0x4000000    1  syz-executor
 510212  24575  60929        0x10  0x4000000    0  syz-executor
proc_trampoline() at proc_trampoline+0xc7
end of kernel
end trace frame: 0x8a489cd5870, count: 14
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.