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<p class="MsoNormal"><span lang="en-DE">I installed the llvm package to get the /usr/bin/llvm-symbolizer (this seems to be needed to get meaningful stacks) .<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE">Brought back the visibility=hidden settings, seems they do no harm to msan . However the removal of
</span><span lang="en-DE">-Wl,--exclude-libs,ALL is needed.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE">With the llvm-symbolizer added I get now a stack with file names and line numbers (in the build when the new javac is used) :</span><span lang="en-DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE">==81626==WARNING: MemorySanitizer: use-of-uninitialized-value<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #0 0x7f83267b8121 in JfrThreadLocal::JfrThreadLocal() make/hotspot/src/hotspot/share/jfr/support/jfrThreadLocal.cpp:81:22<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #1 0x7f8327d2e00d in Thread::Thread(MemTag) make/hotspot/src/hotspot/share/runtime/thread.cpp:64:9<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #2 0x7f8326606ef4 in JavaThread::JavaThread(MemTag) make/hotspot/src/hotspot/share/runtime/javaThread.cpp:415:3<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #3 0x7f8327d5347c in Threads::create_vm(JavaVMInitArgs*, bool*) make/hotspot/src/hotspot/share/runtime/threads.cpp:555:33<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #4 0x7f8326865cd2 in JNI_CreateJavaVM_inner(JavaVM_**, void**, void*) make/hotspot/src/hotspot/share/prims/jni.cpp:3587:12<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #5 0x7f8326865cd2 in JNI_CreateJavaVM make/hotspot/src/hotspot/share/prims/jni.cpp:3678:14<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #6 0x7f8329f16008 in InitializeJVM make/src/java.base/share/native/libjli/java.c:1506:9<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #7 0x7f8329f16008 in JavaMain make/src/java.base/share/native/libjli/java.c:494:10<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #8 0x7f8329f21088 in ThreadJavaMain make/src/java.base/unix/native/libjli/java_md.c:646:29<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #9 0x7f8329ecf6e9 in start_thread (/lib64/libpthread.so.0+0xa6e9) (BuildId: 938e42b7e407d175ee3ef9a89c038168101d330c)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #10 0x7f8329c4458e in clone (/lib64/libc.so.6+0x11858e) (BuildId: 74f77bf013a66413c77197c121955e029c32d259)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE">Seems msan is unhappy about the thread != nullptr in line 81 of jfrThreadLocal.cpp<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> Thread* thread = Thread::current_or_null();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> _parent_trace_id = thread != nullptr ? jvm_thread_id(thread) : (traceid)0;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE">Not sure why this is reported as uninitialized ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE">Best regards, Matthias<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="mso-ligatures:none;mso-fareast-language:#2000"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span lang="EN-US" style="mso-ligatures:none;mso-fareast-language:#2000"><o:p> </o:p></span></b></p>
<p class="MsoNormal">----------------------------------------------------------------------------------------------<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="en-DE">>Could it be that the -Wl,--exclude-libs,ALL “hides” the msan symbols like __</span><span lang="en-DE" style="font-size:12.0pt;mso-ligatures:none;mso-fareast-language:#2000">msan_param_tls from exporting ?</span><span lang="en-DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE">>But I guess we set this for a reason so removing it might cause other trouble ?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE">Seems the -Wl,--exclude-libs,ALL is the setting that caused the msan build issue, when I remove it the build works until the first “new” binary is executed and runs into :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE">==64305==WARNING: MemorySanitizer: use-of-uninitialized-value<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #0 0x7fbe17639b01 (/builddir/jdk/lib/server/libjvm.so+0x246bb01) (BuildId: b0fcd4709b54740840412c9e6ff0c9ce284848e5)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #1 0x7fbe18ba4751 (/builddir/jdk/lib/server/libjvm.so+0x39d6751) (BuildId: b0fcd4709b54740840412c9e6ff0c9ce284848e5)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #2 0x7fbe17489e64 (/builddir/jdk/lib/server/libjvm.so+0x22bbe64) (BuildId: b0fcd4709b54740840412c9e6ff0c9ce284848e5)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #3 0x7fbe18bc90ab (/builddir/jdk/lib/server/libjvm.so+0x39fb0ab) (BuildId: b0fcd4709b54740840412c9e6ff0c9ce284848e5)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #4 0x7fbe176e695b (/builddir/jdk/lib/server/libjvm.so+0x251895b) (BuildId: b0fcd4709b54740840412c9e6ff0c9ce284848e5)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #5 0x7fbe1ae182d8 (/builddir/jdk/bin/../lib/libjli.so+0x112d8) (BuildId: 6ae5315fdc089fba90719ba08ab0373371f52bf5)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #6 0x7fbe1ae23358 (/builddir/jdk/bin/../lib/libjli.so+0x1c358) (BuildId: 6ae5315fdc089fba90719ba08ab0373371f52bf5)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #7 0x7fbe1add06e9 (/lib64/libpthread.so.0+0xa6e9) (BuildId: 938e42b7e407d175ee3ef9a89c038168101d330c)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"> #8 0x7fbe1ab4558e (/lib64/libc.so.6+0x11858e) (BuildId: 74f77bf013a66413c77197c121955e029c32d259)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE">Unfortunately the functions and line numbers from the backtrace are not (yet) nicely displayed , guess this needs some improvement .<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE">When calling addr2line on libjvm.so with the last address from the stack , I get jfrThreadLocal.cpp:81 .<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="en-DE" style="font-size:12.0pt;mso-ligatures:none;mso-fareast-language:#2000"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="en-DE"><o:p> </o:p></span></p>
</blockquote>
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