From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 5C15C3858293; Tue, 19 Jul 2022 14:51:01 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 5C15C3858293
From: "simark at simark dot ca" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug ada/29386] New: UBSan crash in gdb.ada/arrayptr.exp
Date: Tue, 19 Jul 2022 14:51:01 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gdb
X-Bugzilla-Component: ada
X-Bugzilla-Version: HEAD
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: simark at simark dot ca
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-29386-4717@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gdb-prs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gdb-prs mailing list <gdb-prs.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/gdb-prs>,
 <mailto:gdb-prs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/gdb-prs/>
List-Help: <mailto:gdb-prs-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/gdb-prs>,
 <mailto:gdb-prs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Tue, 19 Jul 2022 14:51:01 -0000

https://sourceware.org/bugzilla/show_bug.cgi?id=3D29386

            Bug ID: 29386
           Summary: UBSan crash in gdb.ada/arrayptr.exp
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ada
          Assignee: unassigned at sourceware dot org
          Reporter: simark at simark dot ca
  Target Milestone: ---

On Ubuntu 22.04, with the `gnat-11` package installed (not `gnat`), I get:

$ ./gdb -q --data-directory=3Ddata-directory -nx
testsuite/outputs/gdb.ada/arrayptr/foo -ex "break foo.adb:40"
Reading symbols from testsuite/outputs/gdb.ada/arrayptr/foo...
/home/simark/src/binutils-gdb/gdb/dwarf2/read.c:17563:20: runtime error: sh=
ift
exponent 127 is too large for 64-bit type 'long unsigned int'

It's this line in dwarf2/read.c:

=E2=94=82    17562    negative_mask =3D=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                 =E2=94=82
=E2=94=82  > 17563      -((ULONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET=
_CHAR_BIT -
1));=20=20=20=20

That crashes, while reading this DWARF:

0x00001a2e:       DW_TAG_member
                    DW_AT_name [DW_FORM_strp]   ("OBJECT")
                    DW_AT_decl_file [DW_FORM_data1]=20=20=20=20
("/home/simark/src/binutils-gdb/gdb/testsuite/gdb.ada/arrayptr/foo.adb")
                    DW_AT_decl_line [DW_FORM_data1]     (33)
                    DW_AT_decl_column [DW_FORM_data1]   (0x09)
                    DW_AT_type [DW_FORM_ref4]   (0x00001a3c
"foo__packed_array___XP7___XDLU_0__1180591620717411303423")
                    DW_AT_bit_size [DW_FORM_data1]      (0x46)
                    DW_AT_data_bit_offset [DW_FORM_data1]       (0x00)

0x00001a3c:       DW_TAG_subrange_type
                    DW_AT_lower_bound [DW_FORM_data1]   (0x00)
                    DW_AT_upper_bound [DW_FORM_data16]=20
(ffffffffffffffff3f00000000000000)
                    DW_AT_name [DW_FORM_strp]=20=20
("foo__packed_array___XP7___XDLU_0__1180591620717411303423")
                    DW_AT_type [DW_FORM_ref4]   (0x00001b1c
"long_long_long_unsigned")
                    DW_AT_GNAT_descriptive_type [DW_FORM_ref4]  (0x00001a5a)
                    DW_AT_artificial [DW_FORM_flag_present]     (true)

0x00001b1c:   DW_TAG_base_type
                DW_AT_byte_size [DW_FORM_data1] (0x10)
                DW_AT_encoding [DW_FORM_data1]  (DW_ATE_unsigned)
                DW_AT_name [DW_FORM_strp]       ("long_long_long_unsigned")
                DW_AT_artificial [DW_FORM_flag_present] (true)

--=20
You are receiving this mail because:
You are on the CC list for the bug.=