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  1. JDK
  2. JDK-8258396

SIGILL in jdk.jfr.internal.PlatformRecorder.rotateDisk()

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    • Subcomponent:
      jfr
    • Resolved In Build:
      b03
    • Verification:
      Not verified

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        Description

        We are seeing intermittent crashes at customer site when JFR is rotating chunks.

        {noformat}
        A fatal error has been detected by the Java Runtime Environment:
        SIGILL (0x4) at pc=0x00007fa665cd4e5e, pid=1, tid=376
        JRE version: OpenJDK Runtime Environment Zulu11.41+23-CA (11.0.8+10) (build 11.0.8+10-LTS)
        Java VM: OpenJDK 64-Bit Server VM Zulu11.41+23-CA (11.0.8+10-LTS, mixed mode, tiered, compressed oops, g1 gc, linux-amd64)
        Problematic frame:
        V [libjvm.so+0x8c9e5e]
        Core dump will be written. Default location: //core
        An error report file with more information is saved as:
        /tmp/hs_err_pid1.log
        {noformat}

        Thanks to @evergizova the culprit was identified to be an erroneous memcpy in JfrStorage::flush_regular() or JfrStorage::flush_large() in combination with musl libc which inserts special traps for cases when memcpy src and dst regions overlap (https://git.2f30.org/fortify-headers/file/include/string.h.html#l39).

        The problem boils down to the fact that for a non-empty buffer the JfrStorage::flush_regular_buffer() will
        reset cur.pos() to the start offset while cur_pos will stay at the
        start offset + N.
        Then memcpy(cur.pos(), cur_pos, used) will have the
        src and dest regions overlapping (given that used > N) and on Alpine
        linux (musl libc) SIGILL will be raised.

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                Assignee:
                jbachorik Jaroslav Bachorík
                Reporter:
                jbachorik Jaroslav Bachorík
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                  Updated:
                  Resolved: