uvm_fault(0xfffffd805d4675d0, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff82aae000 cs 8 rflags 10246 cr2 0 cpl 0 rsp ffff80002a306050 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff82aae000 Starting stack trace... panic(ffffffff833414b8) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a305fa0) at kerntrap+0x2cb sys/arch/amd64/amd64/trap.c:482 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000149e000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:580 dtclose(11e5f,81,2000,ffff80002a296a60) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80002a296a60) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a306150) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806e149980,81,fffffd80097fb548,ffff80002a296a60) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80687f3648,ffff80002a296a60) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80687f3648,ffff80002a296a60) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80687f3648,ffff80002a296a60) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd80687f3648,ffff80002a296a60) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80002a296a60) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80002a296a60,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80002a296a60,ffff80002a3064c0,ffff80002a306410) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a3064c0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3064c0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ee79709ea70, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 74 -1998258176 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *286522 93020 0 0 0 1 syz-executor 87637 83075 0 0x14000 0x200 0 reaper savectx() at savectx+0xae end of kernel end trace frame: 0x75aee249df90, 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.