Upon launching Minecraft 1.14 Pre Release 5, the game would launch, displaying the Mojang logo for about 5 seconds, and then crashed. The message in the log said this:

# # A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x00007faf8abd9e1d, pid=24218, tid=0x00007fafe0154700 # # JRE version: Java(TM) SE Runtime Environment (8.0_201-b09) (build 1.8.0_201-b09) # Java VM: Java HotSpot(TM) 64-Bit Server VM (25.201-b09 mixed mode linux-amd64 compressed oops) # Problematic frame: # C [libjemalloc.so+0x9e1d] je_free+0x21d # # Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again # # An error report file with more information is saved as: # /home/jasper/.minecraft/hs_err_pid24218.log [thread 140393356547840 also had an error] [thread 140395376592640 also had an error] # # If you would like to submit a bug report, please visit: # http://bugreport.java.com/bugreport/crash.jsp # The crash happened outside the Java Virtual Machine in native code. # See problematic frame for where to report the bug. #

Once I ran "ulimit -c unlimited" in the bash terminal, it would launch, but would sometimes crash in the menu.