TIC-80
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nesbox
[0.90 - linux] Tic-80 freezes the system when window focus is gained after a long time
(Hi there, long time no see)
Version : pro 4fdbdec OS: ubuntu 21.04
On focus gained, the process seems to be stuck in the event loop, leaving me no option other than to wait (sometimes a few minutes) or restart the computer.
Hi @nesbox, do you have any clue about what could cause this behavior ? It's making 0.90 quite unusable for me atm, I would be happy to try to fix it but the system-wide freezes make reproducing and bisecting the bug a bit... tedious.
Hi, I still don't know the reason, we could try to downgrade the SDL to 2.0.11 as it was in 0.80 and check...
I tried downgrading sdl to the release-2.0.12 tag (no tag for 2.0.11), still freezing.
Are you able to reproduce the bug ? I'd like to find a way to trigger this behavior more deterministically than "just wait until it f*cks up"
Unfortunately I can't reproduce it but I suspect one commit. Could you pls try to check on this commit 352d0f6. Thank you.
It seems to be way older than that. As of now, I can tell that 0.80 wasn't affected, and that c6d246e0d9 was. Still trying to narrow down the "not affected" side of the interval with more confidence, but that has to be the most tedious and frustrating bughunt I've done ever.
From the commits remaining in the bisect interval, I'm suspecting one of d76902988ed0d0a73307dd0784db34e4dc9a304f (known bad) or 871f18aa78d76384f74b3dc3579c13c513b2bb37 (not tested yet) to have uncovered a weird driver-related issue. That would explain why I seem to be the only one affected and why it's affecting the whole system.
Bisection finished, the result is that 871f18aa78d76384f74b3dc3579c13c513b2bb37 uncovered something nasty looming under the surface.
That driver-related issue hunch seems to be prolific indeed : at the other end of this rabbit hole there is a plethora of i915 related system freezes and GPU hangs, as the i915 driver seems to be a hot mess since the 5.1 kernel line came about (I'm on linux 5.11, ubuntu 21.04 on wayland).
Unfortunately, I'm not able to confirm my condition is of the same nature because nothing appears in the system logs.
So I'll start shooting in the dark.
Great, now the question is, are you using the -DBUILD_SDLGPU=ON flag to build the app?
Depending on your answer, the problem is caused by SDL2 lib or SDLGPU lib.
Could you pls enable
BUILD_SDLGPUand try to reproduce it?
I'll try that.
Another piece of the puzzle : switching from wayland to xorg seems to work without freezing.
I haven't tinkered with TIC in a long time, maybe ask the community if anyone with the driver mentioned above has encountered any issues on wayland recently ? Anyway, closable issue on my end if nobody else wants to hunt this one.