Segmentation fault in asio "compensating_work_started" function

I encountered a SIGSEGV error when using the asio library. I checked the backtrace with GDB and found that the error occurred in the **compensating_work_started** function.

```
void scheduler::compensating_work_started()
{
thread_info_base* this_thread = thread_call_stack::contains(this);
++static_cast(this_thread)->private_outstanding_work;
}

```