uvm_fault(0xffffffff82d412d0, 0xffff8000241f32f3, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x49: repe stosb %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND 4617 41878 0 0 0 0 syz-executor.6 *226382 50593 73 0x1100010 0 1K syslogd memset() at memset+0x49 ffs_write(ffff80002a1e8ab0) at ffs_write+0x924 VOP_WRITE(fffffd806e54f560,ffff80002a1e8cd0,3,fffffd807f7d7af8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245 vn_write(fffffd806fae4558,ffff80002a1e8cd0,0) at vn_write+0x15b sys/kern/vfs_vnops.c:408 dofilewritev(ffff80002a19ed48,e,ffff80002a1e8cd0,0,ffff80002a1e8d90) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375 sys_writev(ffff80002a19ed48,ffff80002a1e8e40,ffff80002a1e8d90) at sys_writev+0xab sys/kern/sys_generic.c:322 syscall(ffff80002a1e8e40) at syscall+0x5ae mi_syscall sys/sys/syscall_mi.h:183 [inline] syscall(ffff80002a1e8e40) at syscall+0x5ae sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7971abb0d840, count: 7 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.