uvm_fault(0xfffffd807e192e28, 0x18, 0, 1) -> e kernel: page fault trap, code=0 Stopped at mtx_enter+0x59: movq 0(%r14),%rax TID PID UID PRFLAGS PFLAGS CPU COMMAND *448936 36522 0 0 0x4000000 0 syz-executor mtx_enter(18) at mtx_enter+0x59 sys/kern/kern_lock.c:320 clockintr_unbind(ffff80000153f330,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff800001495600) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:576 dtclose(11e5f,81,2000,ffff80002a7c3498) at dtclose+0xd5 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80002a7c3498) at dtclose+0xd5 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c95d270) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8067240438,81,fffffd8007bfb958,ffff80002a7c3498) at VOP_CLOSE+0x12a sys/kern/vfs_vops.c:156 vn_closefile(fffffd8067345e18,ffff80002a7c3498) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8067345e18,ffff80002a7c3498) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd8067345e18,ffff80002a7c3498) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8067345e18,ffff80002a7c3498) at closef+0x18d sys/kern/kern_descrip.c:1251 syscall(ffff80003c95d4d0) at syscall+0x97e mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c95d4d0) at syscall+0x97e sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x96e37cee2e0, count: 4 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.