I installed the llvm package to get the /usr/bin/llvm-symbolizer (this
seems to be needed to get meaningful stacks) .
Brought back the visibility=hidden settings, seems they do no harm to msan .
However the removal of -Wl,--exclude-libs,ALL is needed.
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) :
==81626==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x7f83267b8121 in JfrThreadLocal::JfrThreadLocal()
make/hotspot/src/hotspot/share/jfr/support/jfrThreadLocal.cpp:81:22
#1 0x7f8327d2e00d in Thread::Thread(MemTag)
make/hotspot/src/hotspot/share/runtime/thread.cpp:64:9
#2 0x7f8326606ef4 in JavaThread::JavaThread(MemTag)
make/hotspot/src/hotspot/share/runtime/javaThread.cpp:415:3
#3 0x7f8327d5347c in Threads::create_vm(JavaVMInitArgs*, bool*)
make/hotspot/src/hotspot/share/runtime/threads.cpp:555:33
#4 0x7f8326865cd2 in JNI_CreateJavaVM_inner(JavaVM_**, void**, void*)
make/hotspot/src/hotspot/share/prims/jni.cpp:3587:12
#5 0x7f8326865cd2 in JNI_CreateJavaVM
make/hotspot/src/hotspot/share/prims/jni.cpp:3678:14
#6 0x7f8329f16008 in InitializeJVM
make/src/java.base/share/native/libjli/java.c:1506:9
#7 0x7f8329f16008 in JavaMain
make/src/java.base/share/native/libjli/java.c:494:10
#8 0x7f8329f21088 in ThreadJavaMain
make/src/java.base/unix/native/libjli/java_md.c:646:29
#9 0x7f8329ecf6e9 in start_thread (/lib64/libpthread.so.0+0xa6e9) (BuildId:
938e42b7e407d175ee3ef9a89c038168101d330c)
#10 0x7f8329c4458e in clone (/lib64/libc.so.6+0x11858e) (BuildId:
74f77bf013a66413c77197c121955e029c32d259)
Seems msan is unhappy about the thread != nullptr in line 81 of
jfrThreadLocal.cpp
Thread* thread = Thread::current_or_null();
_parent_trace_id = thread != nullptr ? jvm_thread_id(thread) : (traceid)0;
Not sure why this is reported as uninitialized ?
Best regards, Matthias
----------------------------------------------------------------------------------------------
>Could it be that the -Wl,--exclude-libs,ALL “hides” the msan symbols
>like __msan_param_tls from exporting ?
>But I guess we set this for a reason so removing it might cause other trouble ?
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 :
==64305==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x7fbe17639b01 (/builddir/jdk/lib/server/libjvm.so+0x246bb01) (BuildId:
b0fcd4709b54740840412c9e6ff0c9ce284848e5)
#1 0x7fbe18ba4751 (/builddir/jdk/lib/server/libjvm.so+0x39d6751) (BuildId:
b0fcd4709b54740840412c9e6ff0c9ce284848e5)
#2 0x7fbe17489e64 (/builddir/jdk/lib/server/libjvm.so+0x22bbe64) (BuildId:
b0fcd4709b54740840412c9e6ff0c9ce284848e5)
#3 0x7fbe18bc90ab (/builddir/jdk/lib/server/libjvm.so+0x39fb0ab) (BuildId:
b0fcd4709b54740840412c9e6ff0c9ce284848e5)
#4 0x7fbe176e695b (/builddir/jdk/lib/server/libjvm.so+0x251895b) (BuildId:
b0fcd4709b54740840412c9e6ff0c9ce284848e5)
#5 0x7fbe1ae182d8 (/builddir/jdk/bin/../lib/libjli.so+0x112d8) (BuildId:
6ae5315fdc089fba90719ba08ab0373371f52bf5)
#6 0x7fbe1ae23358 (/builddir/jdk/bin/../lib/libjli.so+0x1c358) (BuildId:
6ae5315fdc089fba90719ba08ab0373371f52bf5)
#7 0x7fbe1add06e9 (/lib64/libpthread.so.0+0xa6e9) (BuildId:
938e42b7e407d175ee3ef9a89c038168101d330c)
#8 0x7fbe1ab4558e (/lib64/libc.so.6+0x11858e) (BuildId:
74f77bf013a66413c77197c121955e029c32d259)
Unfortunately the functions and line numbers from the backtrace are not (yet)
nicely displayed , guess this needs some improvement .
When calling addr2line on libjvm.so with the last address from the stack , I
get jfrThreadLocal.cpp:81 .
