uvm_fault(0xfffffd800dfbb208, 0x0, 0, 1) -> e kernel: page fault trap, code=0 Stopped at dt_ioctl_record_stop+0x108: movq 0(%r14),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND 399179 19493 0 0 0x4000000 1 syz-executor dt_ioctl_record_stop(ffff800001495000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff8000fffe8020) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000fffe8020) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c43b6d0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8067d1c100,81,fffffd80097fd410,ffff8000fffe8020) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806845b910,ffff8000fffe8020) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806845b910,ffff8000fffe8020) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806845b910,ffff8000fffe8020) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806845b910,ffff8000fffe8020) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffe8020) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffe8020,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe8020,ffff80003c43ba40,ffff80003c43b990) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c43ba40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c43ba40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71474ddef3f0, 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.