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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug tdep/29432] New: [gdb, tdep/s390x] Self test failed: self-test
 failed at arm-tdep.c:14482 (selftest arm-record)
Date: Sat, 30 Jul 2022 08:08:11 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29432

            Bug ID: 29432
           Summary: [gdb, tdep/s390x] Self test failed: self-test failed
                    at arm-tdep.c:14482 (selftest arm-record)
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tdep
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

The gdb-fedora-s390x buildbot fails, alternatively with checkout problems a=
nd
an actual failure.

For an example of the latter, see
https://builder.sourceware.org/buildbot/#/builders/75/builds/839 :
...
Ran 3640 unit tests, 1 failed
(gdb) PASS: gdb.gdb/unittest.exp: no executable loaded: maintenance selftes=
t,
ran some tests
FAIL: gdb.gdb/unittest.exp: no executable loaded: maintenance selftest, fai=
led
none
...

In more detail:
...
Running selftest arm-record.
Process record and replay target doesn't support syscall number -2036195
Process record does not support instruction 0x7f70ee1d at address 0x0.
Self test failed: self-test failed at ../../binutils-gdb/gdb/arm-tdep.c:144=
82
...

The failure is in the "ret =3D=3D 0" selftest:
...
    static const uint16_t insns[] =3D {
      /* 1d ee 70 7f     mrc    15, 0, r7, cr13, cr0, {3} */
      0xee1d, 0x7f70,
    };

    enum bfd_endian endian =3D gdbarch_byte_order_for_code (arm_record.gdba=
rch);
    instruction_reader_thumb reader (endian, insns);
    int ret =3D decode_insn (reader, &arm_record, THUMB2_RECORD,
                           THUMB2_INSN_SIZE_BYTES);

    SELF_CHECK (ret =3D=3D 0);
    SELF_CHECK (arm_record.mem_rec_count =3D=3D 0);
    SELF_CHECK (arm_record.reg_rec_count =3D=3D 1);
    SELF_CHECK (arm_record.arm_regs[0] =3D=3D 7);
...

Note that the:
...
Process record does not support instruction 0x7f70ee1d at address 0x0.
...
message corresponds to the insns array.  Hm, process record seems to think =
that
it's one insn, while in fact there are two.

--=20
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