慎用java 6u25 6u26-优快云博客

本文讨论了服务器在启动不久后崩溃的问题，详细分析了日志中关于内存不足导致Java运行时环境无法继续运行的错误信息。文章进一步解释了这一问题背后的技术原理，并提供了两种解决方案：更新Java虚拟机版本或添加启动参数来避免内存泄露。

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昨天，原来公司的一个同事的服务器遇到了一个问题。服务器在启动不久以后，突然的crash，并且在log中有如下的记录：

#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (malloc) failed to allocate 1066656 bytes for Chunk::new
# Possible reasons:
#   The system is out of physical RAM or swap space
#   In 32 bit mode, the process size limit was hit
# Possible solutions:
#   Reduce memory load on the system
#   Increase physical memory or swap space
#   Check if swap backing store is full
#   Use 64 bit Java on a 64 bit OS
#   Decrease Java heap size (-Xmx/-Xms)
#   Decrease number of Java threads
#   Decrease Java thread stack sizes (-Xss)
#   Set larger code cache with -XX:ReservedCodeCacheSize=
# This output file may be truncated or incomplete.
#
#  Out of Memory Error (allocation.cpp:317), pid=7684, tid=776207248
#
# JRE version: 6.0_26-b03
# Java VM: Java HotSpot(TM) Server VM (20.1-b02 mixed mode linux-x86 )

---------------  T H R E A D  ---------------

Current thread (0x2f3df800):  JavaThread "C2 CompilerThread1" daemon [_thread_in_native, id=7699, stack(0x2e3bf000,0x2e440000)]

Stack: [0x2e3bf000,0x2e440000],  sp=0x2e43cfb0,  free space=503k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x7248b0]

这个问题原来还真没遇到过。查了一下资料，貌似是java 6u25以及6u26存在的一个bug。这个bug应该是涉及到逃逸分析方面的。具体描述请看http://stackoverflow.com/questions/6344546/java-6-update-25-vm-crash-insufficient-memory。

解决的方案有两种，一种是换java虚拟机版本，另外一种是添加启动参数：-XX:-DoEscapeAnalysis