Logstash crashes after running for some time on Windows

I'm using Logstash 1.5.3 on Windows Server 2008. After running for some time (between 30 minutes and 24 hours, usually), Logstash crashes with:

```
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000007feee3b1aa4, pid=1075068, tid=1075604
```

A core dump is also written out.

Other interesting error info:

```
# JRE version: Java(TM) SE Runtime Environment (8.0_51-b16) (build 1.8.0_51-b16)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.51-b03 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# C [racob-x64.dll+0x1aa4]
```

Full error log is at http://pastebin.com/hcXzsDi2, my configuration file is at http://pastebin.com/vHpc93Rm. Let me know if you need any other info.