My client segfaults and crashes occasionally when switching worlds on a multiplayer server. So far I cannot recreate it every time, but it happens about 10% of the time and I have recreated it about a dozen times. I believe it may be related to switching worlds multiple times in quick succession, but I cannot be sure of that.

The crash log from my phone is attached.

Update: With about 60 tries on an iPhone 4 running iOS 7.1.2, I cannot recreate this issue using the same exact circumstances as causes the crashes on my iPhone 6 plus.