[Linux] JavaFX media tests crash with 8u40

Reproducible: always
Is a regression: yes, works fine for 8u25
Introduced in: 8u40b01
Is it platform-specific: yes, Ubuntu,
Fails example run (Ubuntu 12): http://aurora.ru.oracle.com/functional/faces/RunDetails.xhtml?names=611418.ManualSubmit-1
Fails example run (Ubuntu 14): http://aurora.ru.oracle.com/functional/faces/RunDetails.xhtml?names=611045.ManualSubmit-1

Steps to reproduce:
1. Compile and run attached demo code with 8u40b09
Expected result: Scene is shown, dorbell sound played without error output.
Actual result: Something like this error.
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f9332cc2f29, pid=16009, tid=140267958507264
#
# JRE version: Java(TM) SE Runtime Environment (8.0_40-b01) (build 1.8.0_40-ea-b01)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.40-b04 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C [libc.so.6+0x80f29]

Or this:
java: malloc.c:3695: _int_malloc: Assertion `(unsigned long) (size) >= (unsigned long) (nb)' failed.