os error 997 (WSA_IO_PENDING) causes disconnection randomly

[cathiecode]

I tested with VRChat however probably causes with any applications.

Description

The client randomly disconnects from the server with log os error 997.
According to Microsoft documentation, Winsock error 997 is called WSA_IO_PENDING, which indicates requested system calls will be done lately. I think this is harmless, at least when I use UDP connections.
This may be caused by overload however my connection and system seem to have enough bandwidth for streaming. Anyway, I think WSA_IO_PENDING should be handled as a non-fatal disconnection.

General Troubleshooting

• I carefully followed the instructions in the README and successfully completed the setup wizard
• I read the ALVR Wikis here and here

Environment

Hardware

Note: for Linux, an upload to the hw-probe database is preferred: hw-probe -all -upload

CPU: Ryzen 5 5500

GPU: Radeon RX 6600 XT

GPU Driver Version: 23.7.2

Audio: On-board configuration (High definition audio device)

Network: Windows 11 -> (Ethernet) -> Wi-fi router -> (5Ghz Wi-fi) -> Quest 2

Installation

ALVR Version: 20.2.1 and v21.0.0-dev00+nightly.2023.08.27

ALVR Settings File: Default setting, provided with the setup wizard. session.json.txt

SteamVR Version: 1.26.7

Install Type:

• Packaged (exe, deb, rpm, etc) - tested with stable
• Portable (zip) - tested with nigthly
• Source

OS Name and Version : Windows 11 Home Build 22621.2134 (Japanese)

Log around error 997 from nightly: session_log_around_error_997.txt
Full Log: Too big to upload so I uploaded to Google Drive. File
Translated error 997 log text from Japanese: Client disconnected. Cause: Performing duplicate I/O operations. (os error 997)
Log by local debug build:

Sorry for my poor English and scarce knowledge.

[cathiecode]

After some investigation, I realized it may be a regression made around 444d087 - e440137 for synced socket.

[zmerp]

Thank you for your help. Are you able to find the exact commit of the regression?

[cathiecode]

I don't know how it works and disconnection occurs randomly so it will take a long time, But I'll try. Thanks for the huge effort in developing ALVR.

[cathiecode]

I bisected and I comfirmed this does not happen before 7/17 nightly and occurs in 20.2.1 Release, at least.
I tried to check 8/16 nightly, the log does not appears but crashes without log, so I gave up bisecting.
After inspecting several crash logs and codes, I'm suspecting changes around 803ffb5 causing this phenomenon.
I Sorry for unclear report.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Vixea]

Nawh unstale

[Malachiel87]

Any new about this issue? it happen also with ALVR wired USB