Zombie named pipe handle after unloading DLL from process

[ff14wed]

Issue

This issue tracks the situation wherein the Deucalion named pipe handle still exists on the host process even after the DLL has been unloaded from memory. This issue should not occur during normal usage.

Reproduction

1. Inject Deucalion into the host process.
2. Connect a subscriber to Deucalion and start receiving data.
3. Use the signal_exit script to signal Deucalion to exit while data is being received.
4. The first subscriber will most likely hang waiting for more data. You can kill this subscriber since the server is gone.

Symptoms

• Connecting to the named pipe will result in an "i/o timeout" error
• Deucalion exits immediately after injection into the process, and logs state Server encountered error running: Access is denied. (os error 5)
• No data can be received by applications

Workaround

• Use Process Explorer to find the host process, scroll through the list of handles to find \\.\pipe\deucalion-* and forcibly kill the handle. New injection attempts should succeed.

[ff14wed]

Fixed for now since it cannot be reproduced with the same instructions anymore.