Affects Version/s: Minecraft 16w39a
Fix Version/s: None
Environment:OS: Windows 10 (ver 10.0, arch amd64)
Java: 1.8.0_25 (by Oracle Corporation)
Launcher: Minecraft Launcher 1.6.61 (bootstrap 100)
Minecraft: 16w39a (updated Wed Sep 28 15:33:50 CEST 2016)
I was playing around with the totem of undying to see what activates it. When I gave myself the effect "minecraft:wither 1000000 255" and died of it whilst holding the totem, it didn´t disappear. I gave myself the wither effect again and suddenly the game crashed.
I tried it again multiple times and there the game crashed immediately upon death. The amplifier of the effect doesn´t matter but it has to have a duration of 1000000 (infinitely).
To recreate the issue you have to:
1. be in survival mode
2. hold a totem of undying
3. give yourself the wither effect with a duration of 1000000
4. wait until you die