Re: [fpc-pascal] Spurious SIGSEGV on ARMHF with application compiled with fpc trunk

2014-03-02 Thread Reinier Olislagers 
On 01/03/2014 11:02, Reinier Olislagers wrote:
 fpc trunk r26906, cross compiled fpcup for ARMHF; running on Odroid U3
 Xubuntu; ran under gdb:
 fpcup stops with a SIGSEGV:
snip

Went back to fpc revision 26550 (end of January), rebuilt cross
compiler, rebuilt fpcup.

Ran fpcup with fpc revision set once again to 26550, Lazarus revision to
43823.

This time, fpcup completed without error.

My guess is that the compiler messes up exception handling... on my to
do list is running fpc trunk compiled fpcup under the debugger to see
what exactly goes wrong...

Thanks,
Reinier

More details:
Both times compiled with (cross)compile options:
-dFPC_ARMHF -CpARMV6 -CaEABIHF -CfVFPV2
fpcup project settings:
- release build
no optimization
-Xs

- debug build
no optimization
-g
-gl
-Ci
-Cr
-Co
-Ct

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Re: [fpc-pascal] Spurious SIGSEGV on ARMHF with application compiled with fpc trunk

2014-03-02 Thread Reinier Olislagers 
On 01/03/2014 11:02, Reinier Olislagers wrote:
 fpc trunk r26906, cross compiled fpcup for ARMHF; running on Odroid U3
 Xubuntu; ran under gdb:
 fpcup stops with a SIGSEGV:

Had tried to build a simple program to repeat the problem, compiled with
r26906 and ran it. Of course :( it didn't throw a SIGSEGV...

program nonexistingfile;

{$mode objfpc}{$H+}

uses
  {$IFDEF UNIX}{$IFDEF UseCThreads}
  cthreads,
  {$ENDIF}{$ENDIF}
  Classes, SysUtils, process;

var
  AProcess: TProcess;
begin
  AProcess:=TProcess.Create(nil);
  try
try
  AProcess.Executable:='/tmp/filemustnotexist';
  AProcess.Execute;
  if AProcess.ExitCode=0 then
writeln('Process exitcode 0')
  else
writeln('Failure. Non-zero process exitcode');
  writeln('Process done, leaving try...except');
except
  on E: Exception do
writeln('exception: '+E.Message);
end;
  finally
AProcess.Free;
  end;
  writeln('Program finished');
end.



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[fpc-pascal] Spurious SIGSEGV on ARMHF with application compiled with fpc trunk

2014-03-01 Thread Reinier Olislagers 
fpc trunk r26906, cross compiled fpcup for ARMHF; running on Odroid U3
Xubuntu; ran under gdb:
fpcup stops with a SIGSEGV:
...
fpcup: info: Created launcher script for
FPC:/home/odroid/development/fpctrunk/bin/arm-linux/fpc.sh
Executing : /home/odroid/development/fpctrunk/compiler/ppc1 -iV
(working dir: )
2.7.1
Executing : /home/odroid/development/fpctrunk/bin/arm-linux/fpcmkcfg
-h (working dir: )

Program received signal SIGSEGV, Segmentation fault.
0x00029998 in SYSTEM_$$_PUSHEXCEPTOBJECT$TOBJECT$POINTER$POINTER ()
(gdb) bt
#0  0x00029998 in SYSTEM_$$_PUSHEXCEPTOBJECT$TOBJECT$POINTER$POINTER ()
#1  0x00083800 in EXECUTECOMMANDINDIR (
COMMANDLINE=0xb6e6e00c
/home/odroid/development/fpctrunk/bin/arm-linux/fpcmkcfg -h,
DIRECTORY=0x0, OUTPUT=0x0, VERBOSE=true) at processutils.pas:445
#2  0x000836a8 in EXECUTECOMMAND (
COMMANDLINE=0xb6e6e00c
/home/odroid/development/fpctrunk/bin/arm-linux/fpcmkcfg -h,
OUTPUT=0x0, VERBOSE=true) at processutils.pas:431
#3  0x000b92ac in TINSTALLER__CHECKEXECUTABLE (
EXECUTABLE=0xb6e6f22c
/home/odroid/development/fpctrunk/bin/arm-linux/fpcmkcfg,
PARAMETERS=0x160480 -h, EXPECTOUTPUT=0x16091c fpcmkcfg,
this=error reading variable) at installercore.pas:457
#4  0x000c1428 in TFPCINSTALLER__BUILDMODULE (MODULENAME=0xb6fc84ac FPC,
this=error reading variable) at installerfpc.pas:1198
#5  0x000d1a54 in TSEQUENCER__DOBUILDMODULE (MODULENAME=0xb6fc84ac FPC,
this=error reading variable) at installermanager.pas:624
#6  0x000d4e50 in TSEQUENCER__RUN (SEQUENCENAME=0xb6fccf4c FPCBuildOnly,
this=error reading variable) at installermanager.pas:1224
#7  0x000d4ccc in TSEQUENCER__RUN (SEQUENCENAME=0x1662e4 Only,
this=error reading variable) at installermanager.pas:1214
#8  0x000d12fc in TFPCUPMANAGER__RUN (this=error reading variable)
at installermanager.pas:536
#9  0xdc24 in main () at fpcup.lpr:802

The executable processutils is trying to execute does not exist. This is
not a problem on e.g. Windows/x64 Linux.

What I don't understand: the last line of fpcup output above seems to
indicate the code has actually reached the execution part in my code,
TProcessEx.Execute.
The TProcessEx.ExecuteCommandInDir call in #1 calls overloaded versions
of ExecuteCommandIndir until they end up calling TProcessEx.Execute.
Why doesn't that show up in the backtrace?

What does this line mean:
#0  0x00029998 in SYSTEM_$$_PUSHEXCEPTOBJECT$TOBJECT$POINTER$POINTER ()
... part of the FPC exception handling code perhaps?

I'm now going to go back to a revision of end January (where I had a
working fpcup) to see if that fixes things.

Suggestions/tips welcome.

Thanks,
Reinier

More details:
fpcup revision 416db02e900c
Source:
https://bitbucket.org/reiniero/fpcup/src/?at=processutils_bug_on_armhf
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