macOS 11.1 无法使用 jmap 命令

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这是一个创建于 1394 天前的主题，其中的信息可能已经有所发展或是发生改变。

最近才发现 macOS 上 jmap 命令无法使用，报错如下

❯ jhsdb jmap --heap --pid 14657
Attaching to process ID 14657, please wait...
ERROR: attach: task_for_pid(14657) failed: '(os/kern) failure' (5)
Error attaching to process: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process. Could be caused by an incorrect pid or lack of privileges.
sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process. Could be caused by an incorrect pid or lack of privileges.
	at jdk.hotspot.agent/sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$BsdDebuggerLocalWorkerThread.execute(BsdDebuggerLocal.java:170)
	at jdk.hotspot.agent/sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.attach(BsdDebuggerLocal.java:284)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.attachDebugger(HotSpotAgent.java:641)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.setupDebuggerDarwin(HotSpotAgent.java:629)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.setupDebugger(HotSpotAgent.java:364)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:329)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:139)
	at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.start(Tool.java:187)
	at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
	at jdk.hotspot.agent/sun.jvm.hotspot.tools.JMap.main(JMap.java:176)
	at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runJMAP(SALauncher.java:331)
	at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:483)
Caused by: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process. Could be caused by an incorrect pid or lack of privileges.
	at jdk.hotspot.agent/sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.attach0(Native Method)
	at jdk.hotspot.agent/sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$1AttachTask.doit(BsdDebuggerLocal.java:275)
	at jdk.hotspot.agent/sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$BsdDebuggerLocalWorkerThread.run(BsdDebuggerLocal.java:145)

我尝试的解决方案

根据 https://bugs.openjdk.java.net/browse/JDK-8025666 给出的解决方案就是使用 root 账号来运行，但我sudo jhsdb jmap --heap --pid 14657不行；
检查过运行所使用的 jdk 和使用 jmap 命令的 jdk，均是同一个。
升级 jdk 版本。在

openjdk version "1.8.0_275"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_275-b01)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.275-b01, mixed mode)

和

openjdk version "15.0.1" 2020-10-20
OpenJDK Runtime Environment (build 15.0.1+9)
OpenJDK 64-Bit Server VM (build 15.0.1+9, mixed mode, sharing)

上验证了一下也不行

2 条回复 • 2021-11-21 00:04:30 +08:00

Kobayashi

2021-01-15 00:59:12 +08:00 via Android

盲猜：这个进程 ID 已被其他程序占用了？

10458040

2021-11-21 00:04:30 +08:00

解决了吗。遇到同样的问题切到 jdk17 也不行