Here is there error i'm getting.
(gdb) att 670
Attaching to process 670.
warning: error on line 221 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/macosx-nat-infthread.c" in function "kern_return_t modify_trace_bit(thread_t, int)": (os/kern) invalid argument (0x4x)
warning: error on line 395 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/macosx-nat-infthread.c" in function "void prepare_threads_after_stop(struct macosx_inferior_status *)": (os/kern) invalid argument (0x4x)
warning: error on line 221 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/macosx-nat-infthread.c" in function "kern_return_t modify_trace_bit(thread_t, int)": (os/kern) invalid argument (0x4x)
warning: error on line 395 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/macosx-nat-infthread.c" in function "void prepare_threads_after_stop(struct macosx_inferior_status *)": (os/kern) invalid argument (0x4x)
warning: error on line 221 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/macosx-nat-infthread.c" in function "kern_return_t modify_trace_bit(thread_t, int)": (os/kern) invalid argument (0x4x)
warning: error on line 395 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/macosx-nat-infthread.c" in function "void prepare_threads_after_stop(struct macosx_inferior_status *)": (os/kern) invalid argument (0x4x)
warning: error on line 221 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/macosx-nat-infthread.c" in function "kern_return_t modify_trace_bit(thread_t, int)": (os/kern) invalid argument (0x4x)
warning: error on line 395 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/macosx-nat-infthread.c" in function "void prepare_threads_after_stop(struct macosx_inferior_status *)": (os/kern) invalid argument (0x4x)
warning: error on line 221 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/macosx-nat-infthread.c" in function "kern_return_t modify_trace_bit(thread_t, int)": (os/kern) invalid argument (0x4x)
warning: error on line 395 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/macosx-nat-infthread.c" in function "void prepare_threads_after_stop(struct macosx_inferior_status *)": (os/kern) invalid argument (0x4x)
warning: error on line 221 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/macosx-nat-infthread.c" in function "kern_return_t modify_trace_bit(thread_t, int)": (os/kern) invalid argument (0x4x)
warning: error on line 395 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/macosx-nat-infthread.c" in function "void prepare_threads_after_stop(struct macosx_inferior_status *)": (os/kern) invalid argument (0x4x)
warning: Unrecognized osabi 0 in arm_set_osabi_from_host_info
Error calling thread_get_state for GP registers for thread 0x3075lxerror on line 251 of "/Volumes/Builds2/BuildRoot/SourceCache/gdb/gdb-1708/src/gdb/macosx/arm-macosx-nat-exec.c" in function "void fetch_inferior_registers(int)": (os/kern) invalid argument (0x4)