Hello,
I get this errors some time, I can not handle this error so I don't know why raised.

Project myproject raised exception class 'External: SIGSEGV'. -> Ok and continue to run application

Project myproject raised exception class 'RunError(216)'. -> Ok and continue to run application

Project myproject raised exception class 'EAccessViolation'. with message: Access violation -> Ok and continue to run application

Project myproject raised exception class 'External: SIGABRT'. -> Ok and continue to run application

Application freezing. When click to "Reset debugger" button then Application terminate.

My system is Kubuntu 13.10 x64 last svn fpc & lazarus.

looked in google, "External: SIGSEGV" error about not enough info for me.

procedure TFRM_.QUE_Upd(QUE_s: Boolean);
var Unq_id : IntPtr;
begin
if not QUE_s then exit;
try
if not QUE_1.FieldByName('UNQ_ID').IsNull and
(QUE_1.FieldByName('UNQ_ID').AsInteger>=0)then
Unq_id := QUE_1.FieldByName('UNQ_ID').AsInteger
else Unq_id := -1;
QUE_1.Close;
QUE_1.Open;
if Unq_id-1then QUE_1.Locate('UNQ_ID', Unq_id, []);
if not QUE_2.FieldByName('UNQ_ID').IsNull and
(QUE_2.FieldByName('UNQ_ID').AsInteger>=0)then
Unq_id := QUE_2.FieldByName('UNQ_ID').AsInteger
else Unq_id := -1;
QUE_2.Close;
QUE_2.Open;
if Unq_id-1then QUE_2.Locate('UNQ_ID', Unq_id, []);
except
on E: Exception do begin
Application.MessageBox(PChar('Error raised...' + LineEnding + E.Message),
PChar(Application.Title), MB_OK + MB_ICONERROR);
end;
end;
end;

I have QUE_3 too. Its master detail with QUE_2.
try-except not handle this error. I tried many different code way, always and uncertain time error raised exception
All 3 queries has a rxgrid. TFRM_.QUE_Upd procedure for, update datas on form if other forms or applications changed data.
For testing I remove debug info, and run with out IDE, I can't see error but Application freezing and terminate it.

Has any one idea about this ?
Regards.

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El 14/04/14 12:49, FreeMan ha escrit:

It's an access to unallocated memory or trying to use a class instance that doesn't exist (i.e. it is nil).
Since I don't know your program, maybe one of the FieldByName call is returning nil (i.e., a field with that name doesn't exist, so either the IsNull or the AsInteger would generate a SIGSEV:

No currently it doesn't :-(
Note that in most cases when hitting such an error the only sensible option would be to terminate the program, but I'd like to intercept the exception and log it to a file before terminating the program, so I can do a post-mortem and see where the SIGSEV occurred.

Bye

Thank you for answer Luca,

14-04-2014 16:58 tarihinde, Luca Olivetti yazd?:

I understood you, I was sent my code, its out off my code, Maybe Grid has a problem,
Q.Close;
Q.Open; and query so fast close & open, can not grid be fast like that ? when I try some different codes, sumo time I get list index outoff bound(x) error in
/opt/lazarus/lcl/grids.pas TCustomGrid.ColRowToOffset(.... line 5562 AccumHeight[index]this cache class maybe not be fast, just my idea

I changed to code to this.This is not good for me, because user has to select row always, check before everything because background refresh move selected row to first row.

  if not QUE_s then exit;
     try
      QUE_1.Refresh;
      QUE_2.DisableControls;
      QUE_2.Refresh;
      QUE_2.EnableControls;
     except....

Can you explain little bir more please? sorry for my poor english

Regards
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El 14/04/14 16:26, FreeMan ha escrit:

I understood you, I was sent my code, its out off my code, Maybe Grid has a problem, Q.Close; Q.Open; and query so fast close & open, can not grid be fast like that ?

I don't think the problem is the grid, but I could be wrong. Note that, while fpc doesn't see this exception, gdb does, so you can try to run your code from lazarus (with gdb) and see where the SIGSEV is generated.

Well, a SIGSEV usually means that you cannot rely on the contents of memory, so recovery is probably impossible.

Bye

run errors are translated here:
http://www.freepascal.org/docs-html/user/userap4.html#x188-195000D

As already explained you are accessing memory that is not part of your app.

If you run in the debugger, then when the debugger reports the error choose "break", and open the stack window., and search the top line that is in your app.
Sometimes the debugger does not get the stack, you can try to run again. The debugger may report an error again, and there is a chance the stack is available then.
If not, then it will be hard to find. (You need to step, until you find the line, then stop, start over step again, step into the line , start over ....)

If you find the line, inspect all variables.

---------------
You should compile with options such as
- Range check and similar -Criot
- uninitialzied vars -gt (also try -gtt and -gttt / but only one at a time)
- heaptrc -gh

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14-04-2014 17:39 tarihinde, Martin Frb yazd?:

QUE_1Delete;
   if QUE_1.Transaction.Active then
        QUE_1.Transaction.CommitRetaining;

breakpoint on this line:
QUE_1Delete; stop here, Press F8, jump to
/opt/freepascal/2.7.1/packages/fcl-db/src/base/dataset.inc line: 1553 everything is okay, after this been crazy :)
if continue F8 step by step and finish "procedure TDataSet.Delete;" but when jump in "procedure TDataSet.Delete;" press F9 SIGSEGV error popup.

Martin, thanks for answer, tomorrow I'll try your parameter and other suggestions, if still goes on I delete all fpc & lazarus all libs. I'm work on this erorr as long as 2 days, I couldn't find anything :( thank you

Make sure you turn off optimization and smart linking, for the debugger to run ok
http://wiki.lazarus.freepascal.org/Debugger_Setup

14-04-2014 18:14 tarihinde, Martin Frb yazd?:

Make sure you turn off optimization and smart linking, for the debugger to run ok http://wiki.lazarus.freepascal.org/Debugger_Setup

Check your link and mine settings. thats same. one more try and I get error. (pictures on your link need update some properties not on there) I'm not sure, but I'm using rxgrid and Footeroptions.Active := True; one field has get sum. other grid has same and two field has sum. When Active false this, Its work without error, I need more test, then can be sure.
for example procedure TRxDBGrid.CalcStatTotals; has ...

   DHS.First;
   while not DHS.EOF do

I'll add TNotifyEvent one more, Programmer write sql code so faster then this loop. I wish ondrawfooterevent too, If I can write this codes I'll sent to bugtracker (suggestion) too

witch parameter have add for debuging 3rth party components ? Regards.

another My patch and suggestion for rxdbgrid. ( this patch can about my 'External: SIGSEGV' problem )
issue id is 0026027

FreeMan wrote

witch parameter have add for debuging 3rth party components ?

Open the package, and click the options button. Then specify the same debugging settings as in your project.

Note: This only works if the package comes with sources.