[Pkg-pascal-devel] Bug#1055005: lazarus-ide-2.2: gdb 13 dynamic array crash (regression: gdb 10 working)

[Jonas Bechtel]

Package: lazarus-ide-2.2
Version: 2.2.6+dfsg2-2+b1
Severity: important
X-Debbugs-Cc: post at jbechtel.de


Dear maintainers,

I recently wanted to start a little notekeeping program in Free Pascal (Object Pascal) but was very quickly stopped by gdb not working.

After some search for the problem I found that the array initialization was the problem, actually following line:

var scopes: Array of integer = (); // <-- this line causes the crash  

Following conditions have to be met to reproduce the problem:

* The line must be in an extra unit (not application form class unit)
* gdb 13 must be installed (gdb 10 does not crash)


After the system information I copy the most important code files and the last part of debug log.
It is basically a new graphical project with an extra unit.


I have set Severity to "important" because intermediately I was thinking that dynamic arrays are not allowed in fpc Object Pascal which was irritating. When installing gdb 10, however, world looks different.

Feel free to ask for details. Please don't mind high reaction times.

Best regards
 Jonas Bechtel



-- System Information:
Debian Release: 12.2
  APT prefers stable-security
  APT policy: (1202, 'stable-security'), (1201, 'stable-updates'), (1200, 'stable'), (1199, 'stable-debug'), (500, 'oldstable-updates'), (500, 'oldstable-security'), (500, 'oldstable-debug'), (500, 'testing'), (500, 'oldstable')
Architecture: i386 (x86_64)
Foreign Architectures: amd64

Kernel taint flags: TAINT_WARN, TAINT_UNSIGNED_MODULE
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: sysvinit (via /sbin/init)
LSM: AppArmor: enabled

Versions of packages lazarus-ide-2.2 depends on:
ii  fp-compiler-3.2.2 [fp-compiler]  3.2.2+dfsg-20
ii  libatk1.0-0                      2.46.0-5
ii  libc6                            2.36-9+deb12u3
ii  libcairo2                        1.16.0-7
ii  libgdk-pixbuf-2.0-0              2.42.10+dfsg-1+b1
ii  libglib2.0-0                     2.74.6-2
ii  libgtk2.0-0                      2.24.33-2
ii  libpango-1.0-0                   1.50.12+ds-1
ii  libx11-6                         2:1.8.6-1

Versions of packages lazarus-ide-2.2 recommends:
ii  fpc              3.2.2+dfsg-20
ii  fpc-3.2.2 [fpc]  3.2.2+dfsg-20
ii  gdb              13.1-3

Versions of packages lazarus-ide-2.2 suggests:
ii  fp-utils-3.2.2 [fp-utils]  3.2.2+dfsg-20

-- no debconf information



-- sortierfenster.pas

unit sortierfenster;
{$mode objfpc}{$H+}
interface
uses Forms;
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
var Form1: TForm1;
implementation
{$R *.lfm}
uses StorageFile;
procedure TForm1.FormCreate(Sender: TObject);
begin
  TSFile_load;
end;
end.


-- StorageFile.pas

unit StorageFile;
{$mode ObjFPC}{$H+}
interface
procedure TSFile_load();
implementation
procedure TSFile_load();
var scopes: Array of integer = (); // <-- this line causes the crash
begin // SET BREAKPOINT HERE to make gdb 13 crash
end;
end.           


-- Output log (last part)

(gdb) 
<-stack-list-arguments 1 0 0>
^done,stack-args=[frame={level="0",args=[]}]
(gdb) 
<-stack-list-locals 1>
&"\n\n"
&"Fatal signal: "
&"Segmentation fault"
&"\n"
&"----- Backtrace -----\n"
&"Backtrace unavailable\n"
&"---------------------\n"
&"A fatal error internal to GDB has been detected, further\ndebugging is not possible.  GDB will now terminate.\n\n"
&"This is a bug, please report it."
&"This is a bug, please report it."
&"  For instructions, see:\n"