i went through the dmp file with WinDbg of a friend that is currently encountering this error. I'm far from knowledgeable in dump file analysis but looking up the stuff that looks interesting, I found that the reported error (at least in 2 samples I looked at) is invalid pointer/error c0000005 where the unity engine dll is trying to read address 0xFFFFFFFFFFFFFFFF.

(Note: this is different from someone else's report. So honestly this whole comment might not be of any value if I accidentally captured the wrong thing... See note in next paragraph)

Among others, from the dump file:

However, although I can't be sure at all, this doesn't seem to be related to SuspendThread that the error actually shows the user, and c0000005 might just be how Unity is exiting when it encounters that actual bug that I'm not seeing (other than memory issue but seems weird given everyone else's conflicting reports and resolutions).

Also ran and no weird DLLs are present in the dump file just to confirm that it doesn't look like this issue is from anything external.

Hope this is of some use to someone maybe, otherwise uh idk. We are in the witchcraft stage of this bug where everyone seems to be saying something different, hopefully it gets narrowed down on.

Also again, for the record, the friend in question tried quite literally everything you could even remotely think of for troubleshooting including some more advanced stuff. At one time, running let them keep the game running and join a populated instance but they still crashed shortly after in a completely empty instance of the vrchat homeworld.

I had this exact same error ("Fatal error in GC: SuspendThread loop failed" on launch). Fix that worked for me: disabling Windows "Memory Integrity" (HVCI) under Windows Security > Device Security > Core Isolation. Restarted the PC and VRChat launched fine right away.

My guess is this is a conflict between Easy Anti-Cheat and HVCI - and since Microsoft is starting to auto-enable Memory Integrity on more Windows 11 PCs via quality updates from October 2026 (announced Sept 1, 2026), more players will likely run into this going forward.

GPU: RTX 5070 Ti, Windows 11.

My computer stopped receiving system updates since September last year, and after the game update last week, it displayed a white screen and reported a GC memory collection error

Uninstalling the Windows Update KB5124008 fixed it!

I had the same issue. I got it somehow fixed when i installed and played a Game with Vanguard, which flagged an old unused driver for me. I uninstalled the driver and VRChat worked again.

Before i found that solution, i had a workaround to increase my CPU load above 10%.

Let me know if any of these helped.