StreamFX 0.12 causes OBS 29.0.0 to hang on exit on Linux

[hassanelsherbiny]

OBS Studio Logs

• https://obsproject.com/logs/GBfWOOx3ZFP4ZVzB

Current and Expected Behavior

Many thanks for StreamFX, it is an extremely valuable addition to OBS Studio 🙇

I build OBS Studio from source, along with a collection of plugins, in a clean container for Ubuntu 22.04 with -DLINUX_PORTABLE=ON using GCC 11.3.0. StreamFX 0.12 is included and built in-tree. I noticed that OBS was hanging on exit and it appeared to be StreamFX that was halting shutdown while unloading.

info: [obs-websocket 4.9.1-compat] IO thread exited.
info: [obs-websocket 4.9.1-compat] Server stopped successfully.
info: [adv-ss] trying to reconnect to  in 10 seconds.
info: [adv-ss] trying to reconnect to  in 10 seconds.
info: [StreamFX] Unloading Version 0.12.0a168-g07d4e0ab
info: [StreamFX] <gfx::opengl> Finalized.

Does not progress past that 👆 point, so Ctrl+C is issued

^Cfish: Job 1, './obs-portable' terminated by signal SIGSEGV (Address boundary error)

StreamFX 0.12.0a151 was the first tagged pre-release that exhibited the issue, and after some debugging this commit introduced the change in behaviour:

• Vhonowslend/StreamFX-Public@7e234c6

Video Cards:
Driver: AMD Radeon RX 6700 XT (navy_flounder, LLVM 13.0.1, DRM 3.42, 5.15.0-58-generic)
Driver Version: 4.6 (Compatibility Profile) Mesa 22.0.5
OpenGL Version: 4.6
For NVENC encoding only: NVIDIA Corporation TU117GL [T1000 8GB] (rev a1)

Operating System Version:
Ubuntu 22.04.1 LTS (64 bit)
Kernel Name: Linux
Kernel Version: 5.15.0-58-generic

Processor Information:
CPU Vendor: AuthenticAMD
CPU Brand: AMD Ryzen Threadripper 3970X 32-Core Processor
CPU Family: 0x17
CPU Model: 0x31
CPU Stepping 0x0
CPU Type: 0x0
Speed: 4549 Mhz
64 logical processors
32 physical processors
HyperThreading: Supported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSE4a: Supported
SSE41: Supported
SSE42: Supported
AES: Supported
AVX: Supported
AVX2: Supported
AVX512F: Unsupported
AVX512PF: Unsupported
AVX512ER: Unsupported
AVX512CD: Unsupported
AVX512VNNI: Unsupported
SHA: Supported
CMPXCHG16B: Supported
LAHF/SAHF: Supported

Steps to Reproduce the Problem

Build OBS Studio 29.0.0 with StreamFX 0.12.0b164 include in-tree on Ubuntu 22.04.1.

• Start OBS Studio in a terminal
• Complete the startup wizard
• Exit OBS Studio, it will not cleanly exit

Any additional Information we need to know?

Behaviour introduced via Vhonowslend/StreamFX-Public@7e234c6

From a discussion on Discord, this might be a Threadripper-related issue.