How hang request in worker process cause application crash or restart?

Hi,

I am new to IIS, just want to be educated somehow.

I am experiencing the application crash, and I found there are several hang requests in the worker process. I am still debugging it. I have a couple of stupid questions here:

2. 1. How to kill all of them? Recycle?
3. 2. How these hang requests trigger an application crash? I found when the longest hang requests reach to 90 mins, the application crashes, but sometimes it crashes with recycle.