Bloodborne freezes often when moving around, requiring constant debugger pause/resume

[C0rn3j]

Issue originally posted in this PR - #1777

The game keeps freezing (not crashing), and the only way to get it unstuck is to have it launched in a debugger and constantly pause and unpause whenever it happens.

When userfaultfd is enabled, it happens immediately upon entering the character creator.

When it is disabled, it triggers later during loading screens or more often when running around in the game - usually within a minute or less of gameplay.

Full all-thread backtraces from when the game is frozen are available in here - #1777 (comment) and here #1777 (comment)

Log from a build around some Dec 8: shad_log.txt - it happens on a build from today too, though.

[Missake212]

Hey, I was wondering if your PR #1777 also "solves" this issue ?

[C0rn3j]

Nope, it just makes it happen half a minute later.

[C0rn3j]

Having said that, I tested with latest commits and I couldn't reproduce in 2 minutes, and it was very very consistent before, so maybe it is gone now with the userfd patch + recent patches combined, will try later.

[C0rn3j]

I cannot repro on 43fd8fa, I can with -DENABLE_USERFAULTFD=ON

I can repro from an older build I have hanging around e752f04 and I have two versions, I believe one with userfd patch and one without, and both are capable of failing even on the loading screen from loading a savefile.

So it looks like the userfaultfd is causing freezes, and some other issue which was fixed in the last couple days (I tested somewhat often, so it was probably fixed in the last 24h) was too.

TL;DR there were two issues. Latest master + disabled userfd works, enabled userfd has freezes.