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我们正在处理客户的生产服务器堆以检测和解决内存泄漏。为此，我们定期使用 jmap 来收集必要的信息。

但是上周我们无法进行转储，因为它触发了 EOF 错误并关闭了 Tomcat 实例。

我在互联网上搜索，但找不到有关此错误的任何具体信息。我们检测到它仅在使用Gc First垃圾收集器算法时发生。

这是我们用来执行 jmap 的命令行：

jmap -dump:format=b,file=heap.bin <PID>

服务器上的 Java 版本：JDK 1.7.0_7 x64

有没有人已经遇到过这种错误？可能缺少某些配置或需要对 java/jmap 的补丁。

更新

我们收集的有关此错误的更多信息：

[root]# jmap -dump:format=b,file=heap.bin 7806
    Dumping heap to /tmp/heap.bin ...
    Exception in thread "main" java.io.IOException: Premature EOF
        at sun.tools.attach.HotSpotVirtualMachine.readInt(HotSpotVirtualMachine.java:244)
        at sun.tools.attach.LinuxVirtualMachine.execute(LinuxVirtualMachine.java:193)
        at sun.tools.attach.HotSpotVirtualMachine.executeCommand(HotSpotVirtualMachine.java:213)
        at sun.tools.attach.HotSpotVirtualMachine.dumpHeap(HotSpotVirtualMachine.java:180)
        at sun.tools.jmap.JMap.dump(JMap.java:241)
        at sun.tools.jmap.JMap.main(JMap.java:140)
[root]#

注意：目标目录有超过 500gb 的可用空间

输出到 catalina.out 的错误（JVM 转储错误）：

# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f0269cc41c6, pid=7806, tid=139647231129360
#
# JRE version: Java(TM) SE Runtime Environment (7.0_40-b43) (build 1.7.0_40-b43)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (24.0-b56 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# V  [libjvm.so+0x58c1c6]  DumperSupport::dump_field_value(DumpWriter*, char, unsigned char*)+0x1c6
#
# 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:
# /opt/tomcat6/bin/hs_err_pid7806.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.sun.com/bugreport/crash.jsp
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1 回答 1

3

I could able to resolve the issue by using a few additional options.

java version "1.7.0_45".

Java process was configured with first garbage collection algorithm: -XX:+UseG1GC 

jmap -J-d64 -dump:live,format=b,file=<heap_dump_filename> <PID>
于 2015-12-18T20:13:35.467 回答