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Can somebody expla<span style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;">in what does </span><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255); display: inline !important; color: rgb(0, 0, 0);">"Displaced
hdr count” mean? Thanks in advance!</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>发件人:</b> shang xinli <shangxinli@hotmail.com><br>
<b>发送时间:</b> 2019年4月19日 15:08<br>
<b>收件人:</b> Andrew Haley; Kim Barrett; shade@redhat.com<br>
<b>抄送:</b> hotspot-gc-dev@openjdk.java.net<br>
<b>主题:</b> 回复: 回复: JVM crashes constantly when High GC happens</font>
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Thanks Andrew! </div>
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I just reproduced it with the fastdebug build. Now it reports error at PromotionInfo:verify(). More specifically, it found numDisplaceHdrs NOT equal numObjWithDisplaceHdrs. It fails at below. </div>
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guarantee(numDisplacedHdrs == numObjsWithDisplacedHdrs, "Displaced hdr count”);</p>
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Here is the debug info. It would be great if somebody can help to guide how to instrument the code to find out the root cause. </div>
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<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">(gdb) where</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#0</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">0x00007f0b98256067 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#1</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">0x00007f0b98257448 in __GI_abort () at abort.c:89</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#2</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">0x00007f0b973ae0bc in os::abort (dump_core=<optimized out>, siginfo=<optimized out>, context=<optimized out>) at /home/shangx/jdk/src/hotspot/os/linux/os_linux.cpp:1380</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#3</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">0x00007f0b9786dac7 in VMError::report_and_die (id=id@entry=-536870912, message=message@entry=0x7f0b97ad9bd8 "guarantee(numDisplacedHdrs == numObjsWithDisplacedHdrs)
failed", detail_fmt=detail_fmt@entry=0x7f0b97ad9dde "Displaced hdr count",</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)"> </span></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">detail_args=detail_args@entry=0x7ed8791a6b80, thread=0x7ed888375800, pc=pc@entry=0x0, siginfo=0x0, context=0x7f0b98190180 <g_stored_assertion_context>, filename=0x7f0b97ad9370
"/home/shangx/jdk/src/hotspot/share/gc/cms/promotionInfo.cpp", lineno=275, size=0)</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">at /home/shangx/jdk/src/hotspot/share/utilities/vmError.cpp:1571</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#4</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">0x00007f0b9786e8af in VMError::report_and_die (thread=<optimized out>, context=context@entry=0x7f0b98190180 <g_stored_assertion_context>, filename=filename@entry=0x7f0b97ad9370
"/home/shangx/jdk/src/hotspot/share/gc/cms/promotionInfo.cpp", lineno=lineno@entry=275,</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)"> </span></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">message=message@entry=0x7f0b97ad9bd8 "guarantee(numDisplacedHdrs == numObjsWithDisplacedHdrs) failed", detail_fmt=detail_fmt@entry=0x7f0b97ad9dde "Displaced
hdr count", detail_args=0x7ed8791a6b80) at /home/shangx/jdk/src/hotspot/share/utilities/vmError.cpp:1287</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#5</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">0x00007f0b96a478ee in report_vm_error (file=file@entry=0x7f0b97ad9370 "/home/shangx/jdk/src/hotspot/share/gc/cms/promotionInfo.cpp", line=line@entry=275, error_msg=error_msg@entry=0x7f0b97ad9bd8
"guarantee(numDisplacedHdrs == numObjsWithDisplacedHdrs) failed",</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)"> </span></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">detail_fmt=detail_fmt@entry=0x7f0b97ad9dde "Displaced hdr count") at /home/shangx/jdk/src/hotspot/share/utilities/debug.cpp:264</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#6</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">0x00007f0b9746901a in PromotionInfo::verify (this=this@entry=0x7f0b90125020) at /home/shangx/jdk/src/hotspot/share/gc/cms/promotionInfo.cpp:275</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#7</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">0x00007f0b969b6012 in promoted_oops_iterate<ParScanWithoutBarrierClosure> (cl=0x0, this=0x7f0b90125020) at /home/shangx/jdk/src/hotspot/share/gc/cms/promotionInfo.inline.hpp:46</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#8</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">ConcurrentMarkSweepGeneration::par_oop_since_save_marks_iterate_done (this=<optimized out>, thread_num=<optimized out>) at /home/shangx/jdk/src/hotspot/share/gc/cms/concurrentMarkSweepGeneration.cpp:1104</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#9</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)">
</span></span><span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">0x00007f0b973e24c8 in ParNewGenTask::work (this=0x7ed88c5811a0, worker_id=16) at /home/shangx/jdk/src/hotspot/share/gc/cms/parNewGeneration.cpp:622</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#10 0x00007f0b978df7e0 in run_task (data=..., this=0x7ed888375800) at /home/shangx/jdk/src/hotspot/share/gc/shared/workgroup.cpp:335</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#11 GangWorker::loop (this=0x7ed888375800) at /home/shangx/jdk/src/hotspot/share/gc/shared/workgroup.cpp:345</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#12 0x00007f0b977a996b in Thread::call_run (this=0x7ed888375800) at /home/shangx/jdk/src/hotspot/share/runtime/thread.cpp:400</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#13 0x00007f0b973b8e45 in thread_native_entry (thread=0x7ed888375800) at /home/shangx/jdk/src/hotspot/os/linux/os_linux.cpp:714</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#14 0x00007f0b987d8064 in start_thread (arg=0x7ed8791a7700) at pthread_create.c:309</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">#15 0x00007f0b9830962d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">(gdb)
</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)"> </span></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">(gdb)</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)"> </span></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">(gdb)</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)"> </span></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">(gdb)</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)"> </span></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">(gdb) info args</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">sig = 6</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">(gdb) select-frame 6</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">(gdb)</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)"> </span></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">(gdb)</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)"> </span></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">(gdb)</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)"> </span></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">(gdb)</span><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures"><span style="background-color:rgb(0,0,0)"> </span></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">(gdb) info local</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">numObjsWithDisplacedHdrs = <optimized out></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0px; font:12px "Andale Mono"; color:rgb(23,131,5); background-color:rgb(26,26,26); margin:0px; background-color:rgb(26,26,26)">
<span style="font-variant-ligatures:no-common-ligatures; background-color:rgb(0,0,0)">numDisplacedHdrs = 390463</span></p>
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Xinli </div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>发件人:</b> Andrew Haley <aph@redhat.com><br>
<b>发送时间:</b> 2019年4月6日 8:34<br>
<b>收件人:</b> shang xinli; Kim Barrett; shade@redhat.com<br>
<b>抄送:</b> hotspot-gc-dev@openjdk.java.net<br>
<b>主题:</b> Re: 回复: JVM crashes constantly when High GC happens</font>
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<div class="x_PlainText">On 4/6/19 5:37 AM, shang xinli wrote:<br>
> Does anybody know some tools can detect memory corruption at run time? In the Windows world, we can use GFLAGS<<a href="https://blogs.msdn.microsoft.com/webdav_101/2010/06/22/detecting-heap-corruption-using-gflags-and-dumps/">https://blogs.msdn.microsoft.com/webdav_101/2010/06/22/detecting-heap-corruption-using-gflags-and-dumps/</a>>,
is there any equivalent tool in Linux I can use?<br>
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Yes, a fastdebug build adds a lot of checking.<br>
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-- <br>
Andrew Haley<br>
Java Platform Lead Engineer<br>
Red Hat UK Ltd. <<a href="https://www.redhat.com">https://www.redhat.com</a>><br>
EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671<br>
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