uvm_fault(0xfffffd806ba10d08, 0x0, 0, 1) -> e kernel: page fault trap, code=0 Stopped at dt_ioctl_record_stop+0xf0: movq 0(%r14),%r12 TID PID UID PRFLAGS PFLAGS CPU COMMAND dt_ioctl_record_stop(ffff8000014aa580) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:580 dtclose(11e5f,81,2000,ffff80003815c028) at dtclose+0xd5 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003815c028) at dtclose+0xd5 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003212d0e0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806943a470,81,fffffd8007bfb618,ffff80003815c028) at VOP_CLOSE+0x12a sys/kern/vfs_vops.c:156 vn_closefile(fffffd806921f270,ffff80003815c028) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806921f270,ffff80003815c028) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806921f270,ffff80003815c028) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806921f270,ffff80003815c028) at closef+0x190 sys/kern/kern_descrip.c:1251 fdfree(ffff80003815c028) at fdfree+0x115 sys/kern/kern_descrip.c:1182 exit1(ffff80003815c028,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003815c028,ffff80003212d450,ffff80003212d3a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003212d450) at syscall+0x97e mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003212d450) at syscall+0x97e sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74244b393a80, count: 3 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.