Finally, thanks to @Jester, encoding was the problem.
(gdb) r $(python3 -c 'import sys; sys.stdout.buffer.write(b"\x41"*152 + b"\x70\xe3\xff\xff\xff\x7f")')
Solved the isssue.
Same procedure as above gets
Program received signal SIGSEGV, Segmentation fault.
0x00007fffffffe370 in ?? ()