[Bug 46149] New: Python API: process will never stopped at a breakpoint when using LaunchSimple (lldb trunk)

Subprojects LLDB
1

Bug ID 46149
Summary Python API: process will never stopped at a breakpoint when using LaunchSimple (lldb trunk)
Product lldb
Version unspecified
Hardware PC
OS Linux
Status NEW
Severity normal
Priority P
Component All Bugs
Assignee lldb-dev@lists.llvm.org
Reporter yangyibiao@hust.edu.cn
CC jdevlieghere@apple.com, llvm-bugs@lists.llvm.org

When using python api to debugging an executable, the process is never reaching
to a breakpoint. 
When using lldb in terminal, there is no such problem. 

Consider a python script:
...
$ cat test.py
#!/usr/bin/python3

import lldb
import os
import pdb

debugger = lldb.SBDebugger.Create()
debugger.SetAsync(False)

target = debugger.CreateTarget("./a.out")

if target:
    main_bp = target.BreakpointCreateByName("main",
target.GetExecutable().GetFilename())
    print(main_bp)

    process = target.LaunchSimple(None, None, os.getcwd())
    if process:
        print(process)

lldb.SBDebugger.Terminate()
...

the output from python:
...
$ python3 test.py
SBBreakpoint: id = 1, name = 'main', module = a.out, locations = 1
SBProcess: pid = 0, state = launching, threads = 0, executable = a.out
...

$ cat small.c
$ cat small.c
int a, b, d=1;

int main() {
  if (d)
    a = b==0;
  if (a!=1)
    return 1;
  return 0;
}

$ clang -g small.c

$ clang --version
Ubuntu clang version
11.0.0-++20200531052611+dfbfdc96f9e-1~exp1~20200531153245.58 
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

$ lldb --version
lldb version 11.0.0

$ python3 --version
Python 3.8.2