uvm_fault(0xfffffd806c2682c0, 0xf, 0, 1) -> e kernel: page fault trap, code=0 Stopped at ktrops+0x58: movq 0x10(%r14),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND *229851 63609 0 0x8000000 0x4000000 0 syz-executor ktrops(ffff80002e1e56f0,ffffffffffffffff,0,80000310,fffffd80788d3b10,fffffd807f7d75b0) at ktrops+0x58 ktrcanset sys/kern/kern_ktrace.c:718 [inline] ktrops(ffff80002e1e56f0,ffffffffffffffff,0,80000310,fffffd80788d3b10,fffffd807f7d75b0) at ktrops+0x58 sys/kern/kern_ktrace.c:561 doktrace(fffffd80788d3b10,4,310,0,ffff80002e1e56f0) at doktrace+0x6dd ktrsetchildren sys/kern/kern_ktrace.c:586 [inline] doktrace(fffffd80788d3b10,4,310,0,ffff80002e1e56f0) at doktrace+0x6dd sys/kern/kern_ktrace.c:508 sys_ktrace(ffff80002e1e56f0,ffff800035a4d530,ffff800035a4d480) at sys_ktrace+0x11c sys/kern/kern_ktrace.c:549 syscall(ffff800035a4d530) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5c001d6eda0, count: 10 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.