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  1. JDK
  2. JDK-8219650

[TESTBUG] Fix crashes in new test hotspot gtest "test_print_hex_dump"

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      Description

        The new test "test_print_hex_dump", introduced with JDK-8217994 has the issue, that it could cause access to an unaligned address. We've observed crashes on Solaris. Furthermore, the test should run as TEST_VM, because it uses VM features such as ResourceMark. This won't be a problem if the complete test suite is run but for standalone usage, it'll cause problems.

        ---

        After discussing this, we thing that
        - test should use TEST_VM
        - the alignment problems are real issues and should be fixed in os::print_hex_dump();

        ---

        Update: for the record, we had the following issues:

        - Test did not use TEST_VM so signal handlers could be missing depending on test order
        - os::print_hex_dump() had alignment problems.
        - On Windows, the gtest will not work since SEH frame is missing. This is a general problem for gtests and I opened a separate issue for this (JDK-8220220)
        - On AIX, we can read from zero page (address 0) and therefore the test must use a different unreadable address

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            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8220365 [TESTBUG] Fix crashes in new test hotspot gtest "test_print_hex_dump"

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8220433 [TESTBUG] Fix crashes in new test hotspot gtest "test_print_hex_dump"

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8220654 [TESTBUG] Fix crashes in new test hotspot gtest "test_print_hex_dump"

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8226584 [TESTBUG] Fix crashes in new test hotspot gtest "test_print_hex_dump"

            • P3 - Major loss of function.
            • Resolved
            relates to

            Enhancement - null JDK-8217994 os::print_hex_dump should be more resilient against unreadable memory

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

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                stuefe Thomas Stuefe
                clanger Christoph Langer
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                  Updated:
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