clang Memory sanitizer (msan) and OpenJDK

Tue Apr 29 15:44:59 UTC 2025

>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  .

Best regards, Matthias

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