[incr Tcl] / Iwidgets Bugs / #117 Mac OS X: random crashes of wish (tcl/tk 8.6.6) using Iwidgets (4.1.0) radiobox class

Don Porter - 2017-09-28

Thank you for a good report. The demo script
seems to work fine on a linux system. I will try
on an OS X system later when I am on one. Perhaps
next week.

My underinformed guess at this point is you've
run into some platform-specific trouble in Itk 4.1.0.
or possibly Tk 8.6.6. If you have time to blindly try
things, you might look into using Tcl/Tk 8.6.7 and/or
Itcl/Itk 4.0.6.

Will be able to give better answers after I reproduce
the trouble. Should I expect a crash each time?

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Pan Chai - 2017-09-28

Don,

As I indicated in the bug report, this issue only happens in Mac OS X (not in Linux nor Cgywin.) And the script does not crash every time, only randomly but quite often (mostly 7 out of 10.)

From my own testing, I would suggest the possibility of issue between itk 4.1.0 and TK 8.6.6 (I had reported one earlier, #115.) I can try to upgrade TK to 8.6.7 or downgrade itk to 4.0.6 as you suggested to see if it helps. However, in a broader sense, since using Tcl/Tk is not limited to one specific project here, I will hold off on the upgrading Tcl/Tk unless it is deemed to be absolutely necessary.

Thank you again for your help, and look forward to hear from you on your tests.
Pan

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- Pan Chai - 2018-08-06
  
  This is still happening.
  
  I have more information about this one,
  
  Xcode: 9.4+
  Mac OSX: Sierra and High Sierra.
  
  The test scripts is failing now all the time, once I upgraded Xcode to 9.4.2.
  
  Again, I enclosed this script for you..
  
  package require Iwidgets
  ::iwidgets::radiobox .pref -labeltext "Window Management"
  .pref add NONE -text "Leave existing windows open when opening new one"
  .pref add HIDE -text "Hide existing windows when opening new one"
  .pref add CLOSE -text "Close existing windows when opening new one"
  pack .pref
  
  - Pan
  
  Pan Chai
  Pan.S.Chai@nasa.gov Pan.S.Chai@nasa.gov
  301.286.8099/1215 (voice/fax)
  Code 662.0, NASA/GSFC
  Greenbelt, MD 20771
  
  On Sep 28, 2017, at 9:02 AM, Pan Chai pchai2011@users.sf.net wrote:
  
  Don,
  
  As I indicated in the bug report, this issue only happens in Mac OS X (not in Linux nor Cgywin.) And the script does not crash every time, only randomly but quite often (mostly 7 out of 10.)
  
  From my own testing, I would suggest the possibility of issue between itk 4.1.0 and TK 8.6.6 (I had reported one earlier, #115.) I can try to upgrade TK to 8.6.7 or downgrade itk to 4.0.6 as you suggested to see if it helps. However, in a broader sense, since using Tcl/Tk is not limited to one specific project here, I will hold off on the upgrading Tcl/Tk unless it is deemed to be absolutely necessary.
  
  Thank you again for your help, and look forward to hear from you on your tests.
  Pan
  
  [iwidgets-bugs:#117] Mac OS X: random crashes of wish (tcl/tk 8.6.6) using Iwidgets (4.1.0) radiobox class
  
  Status: open
  Group: 4.0.0
  Created: Thu Sep 28, 2017 01:11 AM UTC by Pan Chai
  Last Updated: Thu Sep 28, 2017 11:36 AM UTC
  Owner: nobody
  
  OS: Mac OS X Sierra
  Xcode: 8.3.3, and 9.0
  Tcl/TK: 8.6.6
  itcl/itk: 4.1.0
  iwidgets: 4.1.0
  
  I am having random crashes of "wish" using iwidgets (in this case, "radiobox" class), specificlly on Mac OS X.
  
  Any suggestion will greatly appreciated.
  
  Pan Chai
  
  using this following iwidgets code:
  
  package require Iwidgets
  ::iwidgets::radiobox .pref -labeltext "Window Management"
  .pref add NONE -text "Leave existing windows open when opening new one"
  .pref add HIDE -text "Hide existing windows when opening new one"
  .pref add CLOSE -text "Close existing windows when opening new one"
  pack .pref
  
  Save the above lines in a file, says, test_script, and run the test this way:
  
  wish test_script
  
  These are the three most common crashes I got:
  
  wish test_script
  Segmentation fault: 11
  
  wish test_script
  wish(52643,0x7fffc97083c0) malloc: error for object 0x6e202020200a3020: pointer being freed was not allocated
  set a breakpoint in malloc_error_break to debug
  Abort trap: 6
  
  wish test_script
  wish(52646,0x7fffc97083c0) malloc: error for object 0x7ffe3e9e4698: incorrect checksum for freed object - object was probably modified after being freed.
  set a breakpoint in malloc_error_break to debug
  Abort trap: 6
  
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  Related
  
  Iwidgets Bugs: #117
  
  alternate
  
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Don Porter - 2017-10-02

I am sorry to report that my builds of all those packages on an OSX Sierra system do not demonstrate a crash on the submitted script.

If you can supply more information, I can try again, but if I cannot
reproduce the trouble I cannot really begin to chase down what might be the problem.

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Don Porter - 2018-08-08

Once I set up a testbed with all those outdated releases on an OSX High Sierra system, my testing shows no failure running the test script.

Sorry, but there continues to be nothing I can do when I cannot reproduce the failure.

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