uvm_fault(0xfffffd806748b7d0, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff82e50388 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff800033001560 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff82e50388 Starting stack trace... panic(ffffffff833a774a) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff8000330014b0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff8000015d8000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003ac342c0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003ac342c0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff800033001660) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd807149d8b8,81,fffffd80097fb680,ffff80003ac342c0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805ed67170,ffff80003ac342c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805ed67170,ffff80003ac342c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805ed67170,ffff80003ac342c0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805ed67170,ffff80003ac342c0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003ac342c0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003ac342c0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003ac342c0,ffff8000330019d0,ffff800033001920) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000330019d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000330019d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78c0b8c80d10, 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 354348 4982 0 0 0 0 syz-executor *194710 4982 0 0 0x4000000 1 syz-executor proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x5cb94b1ef00, 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.