Can‘t attach to the process: ptrace(PTRACE

.因为新版的Linux系统加入了 ptrace-scope 机制,该机制的目的是防止用户访问正在执行的进程的内存，但是如jinfo,jmap这些调试类工具本身就是利用ptrace来获取执行进程的内存等信息。

Attaching to process ID 21530, please wait...
Error attaching to process: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process: ptrace(PTRACE_ATTACH, ..) failed for 21530: 不允许的操作
sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process: ptrace(PTRACE_ATTACH, ..) failed for 21530: 不允许的操作
   at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWorkerThread.execute(LinuxDebuggerLocal.java:163)
   at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.attach(LinuxDebuggerLocal.java:278)
   at sun.jvm.hotspot.HotSpotAgent.attachDebugger(HotSpotAgent.java:671)
   at sun.jvm.hotspot.HotSpotAgent.setupDebuggerLinux(HotSpotAgent.java:611)
   at sun.jvm.hotspot.HotSpotAgent.setupDebugger(HotSpotAgent.java:337)
   at sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:304)
   at sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:140)
   at sun.jvm.hotspot.tools.Tool.start(Tool.java:185)
   at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
   at sun.jvm.hotspot.tools.JInfo.main(JInfo.java:138)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at sun.tools.jinfo.JInfo.runTool(JInfo.java:108)
   at sun.tools.jinfo.JInfo.main(JInfo.java:76)
Caused by: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process: ptrace(PTRACE_ATTACH, ..) failed for 21530: 不允许的操作
   at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.attach0(Native Method)
   at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.access$100(LinuxDebuggerLocal.java:62)
   at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$1AttachTask.doit(LinuxDebuggerLocal.java:269)
   at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWorkerThread.run(LinuxDebuggerLocal.java:138)

解决方案:

root@Desktop:/home/appleyuchi# sysctl -w kernel.yama.ptrace_scope=0

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