SemaphoreSlim误用导致锁失效的BUG
BUGinternal class Program
{
static SemaphoreSlim semaphoreSlim = new SemaphoreSlim(1,1);
public async Task foo(CancellToken cancelltoken)
{
try{
//超时会释放锁，进入后序代码执行，不会报错停止执行
...
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