当前版本

mac 版本 BigSur 11.4
java 版本 1.8.0_191

现象

zhenghong@localhost  ~  jmap -heap 30096
Attaching to process ID 30096, please wait...
Error attaching to process: sun.jvm.hotspot.debugger.DebuggerException: Can't attach symbolicator to the process
sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.debugger.DebuggerException: Can't attach symbolicator to the process
    at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$BsdDebuggerLocalWorkerThread.execute(BsdDebuggerLocal.java:169)
    at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.attach(BsdDebuggerLocal.java:287)
    at sun.jvm.hotspot.HotSpotAgent.attachDebugger(HotSpotAgent.java:671)
    at sun.jvm.hotspot.HotSpotAgent.setupDebuggerDarwin(HotSpotAgent.java:659)
    at sun.jvm.hotspot.HotSpotAgent.setupDebugger(HotSpotAgent.java:341)
    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.HeapSummary.main(HeapSummary.java:49)
    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.jmap.JMap.runTool(JMap.java:201)
    at sun.tools.jmap.JMap.main(JMap.java:130)
Caused by: sun.jvm.hotspot.debugger.DebuggerException: Can't attach symbolicator to the process
    at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.attach0(Native Method)
    at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.access$100(BsdDebuggerLocal.java:65)
    at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$1AttachTask.doit(BsdDebuggerLocal.java:278)
    at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$BsdDebuggerLocalWorkerThread.run(BsdDebuggerLocal.java:144)

问题原因

JDK-8160376 DebuggerException: Can't attach symbolicator to the process

解决方法，使用新版本jdk

华为云jdk下载镜像地址

下载jdk11安装

./jmap -heap 30677
Error: -heap option used
Cannot connect to core dump or remote debug server. Use jhsdb jmap instead

jmap命令不支持，使用 jhsdb代替

 ./jhsdb jmap --heap --pid 30877
Attaching to process ID 30877, please wait...
Error attaching to process: java.lang.RuntimeException: can't determine target's VM version : field "_reserve_for_allocation_prefetch" not found in type ThreadLocalAllocBuffer
sun.jvm.hotspot.debugger.DebuggerException: java.lang.RuntimeException: can't determine target's VM version : field "_reserve_for_allocation_prefetch" not found in type ThreadLocalAllocBuffer
    at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:436)
    at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:306)
    at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:141)
    at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.start(Tool.java:185)
    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:326)
    at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:455)
Caused by: java.lang.RuntimeException: can't determine target's VM version : field "_reserve_for_allocation_prefetch" not found in type ThreadLocalAllocBuffer

现在报另外一个报错，我启动进程使用的java8，改成java11。


./jhsdb jmap --heap --pid 31103
Attaching to process ID 31103, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 11+28

using thread-local object allocation.
Garbage-First (G1) GC with 8 thread(s)

Heap Configuration:
   MinHeapFreeRatio         = 40
   MaxHeapFreeRatio         = 70
   MaxHeapSize              = 125829120 (120.0MB)
   NewSize                  = 1363144 (1.2999954223632812MB)
   MaxNewSize               = 75497472 (72.0MB)
   OldSize                  = 5452592 (5.1999969482421875MB)
   NewRatio                 = 2
   SurvivorRatio            = 8
   MetaspaceSize            = 21807104 (20.796875MB)
   CompressedClassSpaceSize = 1073741824 (1024.0MB)
   MaxMetaspaceSize         = 17592186044415 MB
   G1HeapRegionSize         = 1048576 (1.0MB)

Heap Usage:
G1 Heap:
   regions  = 120
   capacity = 125829120 (120.0MB)
   used     = 13631488 (13.0MB)
   free     = 112197632 (107.0MB)
   10.833333333333334% used
G1 Young Generation:
Eden Space:
   regions  = 14
   capacity = 27262976 (26.0MB)
   used     = 14680064 (14.0MB)
   free     = 12582912 (12.0MB)
   53.84615384615385% used
Survivor Space:
   regions  = 0
   capacity = 0 (0.0MB)
   used     = 0 (0.0MB)
   free     = 0 (0.0MB)
   0.0% used
G1 Old Generation:
   regions  = 0
   capacity = 98566144 (94.0MB)
   used     = 0 (0.0MB)
   free     = 98566144 (94.0MB)
   0.0% used