Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8281615

Deadlock caused by jdwp agent

    XMLWordPrintable

    Details

    • Subcomponent:
    • Resolved In Build:
      b11

      Backports

        Description

        Our customer reported a deadlock caused by jdwp agent with jdk11, the stack trace is attached.


        Thread 4: while holding classTrackLock monitor tries to allocate memory, that triggers state transition and gets blocked by on going GC safepoint.

        #12 ThreadInVMfromNative (thread=0x7ffef4036000, this=0x7ffed41e1560) at src/hotspot/share/runtime/interfaceSupport.inline.hpp:267
        #13 jvmti_Allocate (env=0x7ffff000bd70, size=24, mem_ptr=0x7ffed41e15c0, this=<optimized out>) at build/hotspot/variant-server/gensrc/jvmtifiles/jvmtiEnter.cpp:336
        #14 0x00007ffff49c6786 in jvmtiAllocate (numBytes=numBytes@entry=24) at src/jdk.jdwp.agent/share/native/libjdwp/util.c:1808
        #15 0x00007ffff49a92ad in bagCreateBag (itemSize=itemSize@entry=8, initialAllocation=initialAllocation@entry=10) at src/jdk.jdwp.agent/share/native/libjdwp/bag.c:40 << == Holding classTrackLock monitor
        #16 0x00007ffff49a97b0 in classTrack_processUnloads (env=env@entry=0x7ffef4036348) at src/jdk.jdwp.agent/share/native/libjdwp/classTrack.c:91
        #17 0x00007ffff49b1253 in event_callback (env=env@entry=0x7ffef4036348, evinfo=evinfo@entry=0x7ffed41e1700) at src/jdk.jdwp.agent/share/native/libjdwp/eventHandler.c:583
        #18 0x00007ffff49b215e in cbClassPrepare (jvmti_env=<optimized out>, env=0x7ffef4036348, thread=0x7ffee00010d0, klass=0x7ffee00010d8) at src/jdk.jdwp.agent/share/native/libjdwp/eventHandler.c:892
        #19 0x00007ffff6681094 in JvmtiExport::post_class_prepare (thread=0x7ffef4036000, klass=0x840362840) at src/hotspot/share/prims/jvmtiExport.cpp:1337
        #20 0x00007ffff64cf5c8 in InstanceKlass::link_class_impl (this=0x840362840, throw_verifyerror=<optimized out>, __the_thread__=0x7ffef4036000) at src/hotspot/share/oops/instanceKlass.cpp:838

        Thread 88: VMThread is running G1 Remark code, processing weak roots and trying to post object free event and blocked on classTrackLock monitor

        #2 0x00007ffff668f57c in SimpleEnter (Self=<optimized out>, this=<optimized out>) at src/hotspot/share/prims/jvmtiRawMonitor.cpp:150
        #3 JvmtiRawMonitor::raw_enter (this=this@entry=0x7ffff07c0000, __the_thread__=__the_thread__@entry=0x7ffff0755800) at src/hotspot/share/prims/jvmtiRawMonitor.cpp:304
        #4 0x00007ffff6671cb8 in JvmtiEnv::RawMonitorEnter (this=<optimized out>, rmonitor=0x7ffff07c0000) at src/hotspot/share/prims/jvmtiEnv.cpp:3324
        #5 0x00007ffff49c4a7b in debugMonitorEnter (monitor=0x7ffff07c0000) at src/jdk.jdwp.agent/share/native/libjdwp/util.c:1043 << == acquire classTrackLock monitor
        #6 0x00007ffff49a9758 in cbTrackingObjectFree (jvmti_env=<optimized out>, tag=140729502422448) at src/jdk.jdwp.agent/share/native/libjdwp/classTrack.c:67
        #7 0x00007ffff667fe1d in JvmtiExport::post_object_free (env=0x7ffff07c00f0, tag=140729502422448) at src/hotspot/share/prims/jvmtiExport.cpp:1470
        #8 0x00007ffff66a098c in JvmtiTagMap::do_weak_oops (this=0x7ffff07c1940, is_alive=is_alive@entry=0x7fffb4377380, f=f@entry=0x7ffff7182150 <do_nothing_cl>) at src/hotspot/share/prims/jvmtiTagMap.cpp:3377
        #9 0x00007ffff66a0ac5 in JvmtiTagMap::weak_oops_do (is_alive=is_alive@entry=0x7fffb4377380, f=f@entry=0x7ffff7182150 <do_nothing_cl>) at src/hotspot/share/prims/jvmtiTagMap.cpp:3325
        #10 0x00007ffff667eeca in JvmtiExport::weak_oops_do (is_alive=is_alive@entry=0x7fffb4377380, f=f@entry=0x7ffff7182150 <do_nothing_cl>) at src/hotspot/share/prims/jvmtiExport.cpp:2590
        #11 0x00007ffff6b44d11 in WeakProcessor::weak_oops_do (is_alive=is_alive@entry=0x7fffb4377380, keep_alive=0x7ffff7182150 <do_nothing_cl>) at src/hotspot/share/gc/shared/weakProcessor.cpp:38
        #12 0x00007ffff640e9a3 in G1ConcurrentMark::weak_refs_work (this=this@entry=0x7ffff00708f0, clear_all_soft_refs=clear_all_soft_refs@entry=false) at src/hotspot/share/gc/g1/g1ConcurrentMark.cpp:1674
        #13 0x00007ffff640fc59 in G1ConcurrentMark::remark (this=0x7ffff00708f0) at src/hotspot/share/gc/g1/g1ConcurrentMark.cpp:1163


        Start with JDK-8212879 in jdk16, object free events are no longer posted during weak root processing, but they are still posted at safepoints, so potential has the same issue(?)

          Attachments

            Issue Links

              Activity

                People

                Assignee:
                zgu Zhengyu Gu
                Reporter:
                zgu Zhengyu Gu
                Votes:
                0 Vote for this issue
                Watchers:
                6 Start watching this issue

                  Dates

                  Created:
                  Updated:
                  Resolved: