I've decided to actually upload my debug.log, maybe someone else will see more in it than me. Maybe I'll also get more responses here too. There is no such thing as a watchdog killing the process, as well as no stall report either. I'd really like to have this solved. I'm a network engineer, not a developer, it would be hard for me to try to change the LWJGL version myself (could be an initiative to finally learn Eclipse, eh). I've seen couple of people did this already: https://www.youtube.com/watch?v=WB_cN3NdHEw, https://www.youtube.com/watch?v=uijUFzF-R7c.
Debug log: https://gist.github.com/ZXQWAS/54873f48648826072759062d4344757e
I'm using legacy FTB launcher: http://ftb.cursecdn.com/FTB2/launcher/FTB_Launcher.exe. The hang happened at around 2:30 ~ 3:00 AM, I was afk, the backup that happened around that time interval is irrelevant.
This was never present in previous cases (I used grep on the unpacked logs folder):
[01:35:14] [Thread-11/ERROR] [net.minecraft.client.audio.SoundManager]: Error in class 'SourceLWJGL OpenAL'
[01:35:14] [Thread-11/ERROR] [net.minecraft.client.audio.SoundManager]: Channel null in method 'stop'
This was present multiple times, however in most cases I was able to play for many hours after this event:
[02:07:24] [main/WARN] [net.minecraft.client.audio.SoundManager]: Unable to play empty soundEvent: minecraft:entity.small_slime.squish
[02:07:24] [main/WARN] [net.minecraft.client.audio.SoundManager]: Unable to play empty soundEvent: minecraft:entity.small_slime.jump
I can't recognize anything else of relevance. I've killed the right thread from the first try this time, however this didn't help. I've disabled my Realtek High Definition Audio from device manager, however this didn't help too. I'm not running out of memory, I have a Xeon W-2125 with 32G of ECC RAM, with Xmx 10G. The motherboard's audio chip seems to be new and rare though, Realtek ALC S1220A. Is there a way to monitor this Thread-11 in a way to find out how it got stuck in this state? Is this forum even the right place for this report?