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  1. JDK
  2. JDK-8217879

hs_err should print more instructions in hex dump

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      Description

        Currently the "Instructions" block in hs_err prints "only" 64 bytes window around PC:

        Instructions: (pc=0x00002b577170e763)
        0x00002b577170e743: e5 48 83 ec 20 8b 77 30 48 8d 7d e0 64 48 8b 04
        0x00002b577170e753: 25 28 00 00 00 48 89 45 f8 31 c0 e8 fd f4 3a ff
        0x00002b577170e763: c7 04 25 00 00 00 00 00 00 00 00 0f 0b 55 48 89
        0x00002b577170e773: e5 41 57 41 56 41 55 41 54 4c 8d a5 00 fe ff ff

        That is too small of the window to debug, especially when large instructions are encoded. Larger window would make debugging easier.

        Larger window may risk touching the unreadable memory, in which case hs_err machinery would print something like:

        Instructions: (pc=0x0000000000000000)
        0x0000000000000000:
        [error occurred during error reporting (printing registers, top of stack, instructions near pc), id 0xb, SIGSEGV (0xb) at pc=0x00007f9e0a6e59a5]

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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-8222873 hs_err should print more instructions in hex dump

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • 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-8222994 hs_err should print more instructions in hex dump

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • 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-8228926 hs_err should print more instructions in hex dump

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

            Enhancement - null JDK-8293851 hs_err should print more stack in hex dump

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

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                shade Aleksey Shipilev
                shade Aleksey Shipilev
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                  Created:
                  Updated:
                  Resolved: