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  1. JDK
  2. JDK-8194494

SHA-512 stub uses AVX 2 instructions on non-supporting CPUs

    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2
    • Resolution: Fixed
    • Affects Version/s: 9, 10
    • Fix Version/s: 10
    • Component/s: hotspot
    • Labels:
    • Environment:

      Intel Celeron J3455, J3355, N3450 and N3350

    • Subcomponent:
    • Resolved In Build:
      b39
    • CPU:
      x86_64
    • Verification:
      Verified

      Backports

        Description

        See: http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2018-January/028002.html

        # A fatal error has been detected by the Java Runtime Environment:
        #
        # SIGILL (0x4) at pc=0x00007fae6f67c0b4, pid=16238, tid=16239

        Stack: [0x00007fae8f6b8000,0x00007fae8f7b8000], sp=0x00007fae8f7b6940,
        free space=1018k
        Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
        v ~StubRoutines::sha512_implCompress J 171% c2 zzz.main([Ljava/lang/String;)V (96 bytes) @ 0x00007fae770f3689 [0x00007fae770f34a0+0x00000000000001e9]
        v ~StubRoutines::call_stub
        V [libjvm.so+0x7dc059]
        V [libjvm.so+0x7ff420]
        V [libjvm.so+0x801cb1]
        C [libjli.so+0x4b20]
        C [libjli.so+0x89ad]
        C [libpthread.so.0+0x7519] start_thread+0xd9

        The problem seems to be that the processor does not support AVX 2 instructions but the SHA-512 stub uses them. The instruction at the failing address is:

        0x00007fae6f67c0b4: vpblendd(xmm0, xmm0, xmm1, 0xF0, AVX_128bit)

        Looking at the specification for the Intel Celeron J3455 [1], AVX 2 is not supported. I think the problem is that the stub is only guarded by UseSHA and since the CPU does support SHA, the stub is emitted without checking for AVX 2
        support.

        This code was introduced in JDK 9 by JDK-8165381.

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                • Assignee:
                  thartmann Tobias Hartmann
                  Reporter:
                  thartmann Tobias Hartmann
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                  Dates

                  • Created:
                    Updated:
                    Resolved: