Game crash playing on Survival "Using incremental CMS is deprecated"

i started a survival world, ibe only played around 5 minutes when ii had the following Game Crash:

AL lib: (EE) alc_cleanup: 1 device not closed
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

i had it like two times and i dont have idea what it is.