[Bug gdb/27891] New: maintenance selftest fail when an executable is loaded

["andrew.burgess at embecosm dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27891

            Bug ID: 27891
           Summary: maintenance selftest fail when an executable is loaded
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: andrew.burgess at embecosm dot com
  Target Milestone: ---

I built GDB with --enable-targets=all, and am running on an x86-64 GNU/Linux
host.  If I start GDB and load an executable (for example GDB itself), and then
run 'maint selftest', I see 1 failure.

In contrast, if I start GDB and don't load an executable, I see 0 failures.

Here's the error(s) that I see:

 Running selftest print_one_insn.
 Self test failed: arch arm: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv2: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv2a: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv3: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv3m: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv4: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv4t: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv5: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv5t: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv5te: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch xscale: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch ep9312: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch iwmmxt: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch iwmmxt2: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv5tej: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv6: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv6kz: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv6t2: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv6k: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv7: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv6-m: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv6s-m: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv7e-m: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv8-a: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv8-r: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv8-m.base: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv8-m.main: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch armv8.1-m.main: self-test failed at
../../src/gdb/disasm-selftests.c:165
 Self test failed: arch arm_any: self-test failed at
../../src/gdb/disasm-selftests.c:165
 warning: A handler for the OS ABI "GNU/Linux" is not built into this
configuration
 of GDB.  Attempting to continue with the default cris:common_v10_v32 settings.

 Self test failed: self-test failed at ../../src/gdb/selftest-arch.c:85

I had a quick look and it appears that the ARM disassembler gets into a state
where it thinks it is disassembling in thumb mode.  When there is no executable
loaded this is not the case.

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