Can't pause after press run with no breakpoint when debug with cpptool(but can stop at the begining)

• Last question updated: 2020/4/14/14:51
• Enviroment:
• Win10 (x64),
• last version of vscode(2020/4/14),
• Extension version: 0.27.0

Source Code (main.c):
#include <stdio.h>
int main(void)
{
int cnt_1st = 0;
int cnt_2nd = 0;
while (1)
{
// sched_run_idle();
if (cnt_1st > 40000000)
{
cnt_1st = 0;
cnt_2nd++;
if (cnt_2nd > 100)
{
cnt_2nd = 0;
printf("heart beat\n");
}
}
cnt_1st++;
}
return 0;
}
Bug Description:
step1: Before pressing F5 I create a breakpoint in the line of " if (cnt_1st > 40000000)",
step2: then press F5 then we can hit the breakpoint normally,

step3: we can do all debug operations such as watch the value of parameter,and changed them by hand.

step4: once I cancel all breakpoints and press "run" , the debug progress will can't stop anymore,
step5: even I create breakpoint again in any where of the codes, result is the same.

and I found there are 3 threads in the left side of the vscode windows,
all states are RUNING, when click stop in any thread , the thread is still running.

in the console side the heartbeat is keep printing.

launch.json
{
"version": "0.2.0",
"configurations": [
{
"name": "c/c++",
"type": "cppdbg",
"request": "launch",
"program": "${workspaceFolder}/a.exe",
"args": [],
"stopAtEntry": true,
"cwd": "${workspaceFolder}",
"environment": [],
"externalConsole": true,
"MIMode": "gdb",
"miDebuggerPath": "C:/MinGW/bin/gdb.exe",
"setupCommands": [
{
"description": "Enable pretty-printing for gdb",
"text": "-enable-pretty-printing",
"ignoreFailures": true
}
],
"preLaunchTask": "build"
}
]
}
task.json:
{
"version": "2.0.0",
"command": "build",
"tasks": [
{
"label": "build",
"type": "shell",
"command": "gcc",
"args": [
"main.c",
"-g"
]
}
]
}

Reproduce the behavior using main.c, launch.json, and task.json: start with the breakpoint, press F5, cancel the breakpoint, then use Run and Stop. Observe whether the process and its threads remain running and whether newly added breakpoints work. Done means pause, stop, and later breakpoints operate normally after removing the initial breakpoint.