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From: "peter.mckinna at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug m3/27049] New: gdb crashes when printing variable of 2
 dimensional dynamic array
Date: Fri, 11 Dec 2020 00:56:30 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27049

            Bug ID: 27049
           Summary: gdb crashes when printing variable of 2 dimensional
                    dynamic array
           Product: gdb
           Version: 10.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: m3
          Assignee: unassigned at sourceware dot org
          Reporter: peter.mckinna at gmail dot com
  Target Milestone: ---

Created attachment 13036
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D13036&action=3Ded=
it
dwarf dump of executable

Trying to print a dynamic array of greater than one dimension fails in
gdb 10.1

See debug attempt here

(gdb) ptype refArr
type =3D INTEGER (*)[variable length][variable length]
(gdb) p refArr
$1 =3D (INTEGER (*)[variable length][variable length]) 0x555555580158
(gdb) p *refArr
$2 =3D {
value.c:1526: internal-error: CORE_ADDR value_address(const value*): Assert=
ion
`PROP_CONST =3D=3D TYPE_DATA_LOCATION_KIND (value_type (value))' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y

gdb and operating system info

GNU gdb (GDB) 10.1
This GDB was configured as "x86_64-pc-linux-gnu".
Linux Mars 4.19.0-12-amd64 #1 SMP Debian 4.19.152-1 (2020-10-18) x86_64
GNU/Linux

The program is a modula-3 program compiled with cm3 and generating llvm IR
The source code summary is
TYPE
  ArrType =3D ARRAY OF ARRAY OF INTEGER;
VAR
  arr : ArrType
BEGIN
  arr :=3D NEW(ArrType,12,8);
END

A one dimensional dynamic array works. It did not work in gdb 8 but
has since been fixed.

It is difficult to build a testcase without installing cm3 and llvm
I have attached a summary of the dwarf from llvm-dwarfdump

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