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  1. JDK
  2. JDK-8141491

Unaligned memory access in Bits.c

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Details

    • b108
    • x86_64
    • linux
    • Verified

    Backports

      Description

        This is a follow-on issue to JDK-8140630. When devkit was updated to version 4.9.2 on Linux-x86_64, the JDK test java/nio/Buffer/Basic.java crashed with a SIG_SEGV in Mach5 testing. This is a tier 1 failure.

        It was found that compiling src/java.base/share/native/libjava/Bits.c using normal (-O2) optimization instead of high (-O3) resolved the immediate problem. The concern however is that there is an underlying pattern in the optimized compiled code which might manifest itself elsewhere. It would be better to examine the problem in detail in order to find the root cause and hopefully a better solution.

        Attachments

          1. bits.c
            0.3 kB
          2. bits.h
            0.1 kB
          3. hellobits.c
            0.2 kB
          4. Makefile
            0.5 kB

          Issue Links

            backported by

            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-8214709 Unaligned memory access in Bits.c

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8214764 Unaligned memory access in Bits.c

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8214880 Unaligned memory access in Bits.c

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8215098 Unaligned memory access in Bits.c

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8216028 Unaligned memory access in Bits.c

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8216749 Unaligned memory access in Bits.c

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8219265 Unaligned memory access in Bits.c

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8220888 Unaligned memory access in Bits.c

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8214865 Unaligned memory access in Bits.c

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed

            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-8214870 Unaligned memory access in Bits.c

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed

            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-8215189 Unaligned memory access in Bits.c

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8140552 ResourceObj copy ctor stack logic breaks with gcc 4.9.2 on some systems

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed

            Enhancement - null JDK-8149162 Rename java.nio.Bits.copy{From,To}{Char,Short,Int,Long}Array to be more informative

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

            Enhancement - null JDK-8149163 Unsafe.addressSize() does not optimize

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8140630 java/nio/Buffer/Basic.java crashes vm on linux-x64 using latest devkit to build

            • P1 - Blocks development and/or testing work, production could not run.
            • Closed

            Enhancement - null JDK-8149611 Add tests for Unsafe.copySwapMemory

            • P3 - Major loss of function.
            • Resolved

            Enhancement - null JDK-8180032 Unaligned pointer dereference in ClassFileParser

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

            Activity

              People

                mikael Mikael Vidstedt
                bpb Brian Burkhalter
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                Dates

                  Created:
                  Updated:
                  Resolved: