@uvm_fault(0xfffffd800b027988, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff817b3d88 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff800035822cc0 gsbase 0xffffffff8378aff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff817b3d88 Starting stack trace... panic(ffffffff833a2ff9) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff800035822c10) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001536000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,1,2000,ffff80002a2d4030) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,1,2000,ffff80002a2d4030) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff800035822dc0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8069b93628,1,fffffd80097fb2d8,ffff80002a2d4030) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806fd26018,ffff80002a2d4030) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806fd26018,ffff80002a2d4030) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806fd26018,ffff80002a2d4030) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806fd26018,ffff80002a2d4030) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a2d4030) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a2d4030,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a2d4030,ffff800035823130,ffff800035823080) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800035823130) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800035823130) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75dc46ae9b50, count: 242 End of stack trace. W AdRumpN tIoN Gd: SePv L 4,N1O Tn LoOWt EpRoED sOsNi bSlYeSC ALL 91 1185848120 EXIT 0 3 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *148697 88036 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x75dc46ae9b20, 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.