Crash removing Format

[Scott Kostyshak]

On Sat, Aug 08, 2020 at 12:39:50AM -0400, Richard Kimberly Heck wrote:
> On 7/6/20 12:32 PM, Kornel Benko wrote:
> > Am Mon, 6 Jul 2020 11:58:30 -0400
> > schrieb Richard Kimberly Heck <rikiheck at lyx.org>:
> >
> >> On 7/6/20 4:50 AM, Kornel Benko wrote:
> >>> Am Sun, 5 Jul 2020 20:14:27 -0400
> >>> schrieb Richard Kimberly Heck <rikiheck at lyx.org>:
> >>>
> >>>> On 7/5/20 8:12 PM, Richard Kimberly Heck wrote:
> >>>>> On 6/24/20 11:06 AM, Richard Kimberly Heck wrote:  
> >>>>>> On 6/24/20 6:19 AM, Kornel Benko wrote:  
> >>>>>>> Am Tue, 23 Jun 2020 22:01:03 -0400
> >>>>>>> schrieb Scott Kostyshak <skostysh at lyx.org>:
> >>>>>>>  
> >>>>>>>> On Mon, Jun 22, 2020 at 04:55:50PM +0200, Kornel Benko wrote:  
> >>>>>>>>> Am Mon, 22 Jun 2020 10:24:17 -0400
> >>>>>>>>> schrieb Richard Kimberly Heck <rikiheck at lyx.org>:
> >>>>>>>>>     
> >>>>>>>>>> On 6/22/20 10:03 AM, Kornel Benko wrote:    
> >>>>>>>>>>> Following lead to crash:
> >>>>>>>>>>>
> >>>>>>>>>>> 	1. Create new file-Format (for instance Epub, define a viewer)
> >>>>>>>>>>> 	2. define conversion for docbook-xls -> Epub
> >>>>>>>>>>> 	3. restart lyx
> >>>>>>>>>>> 	4. remove the new conversion
> >>>>>>>>>>> 	5. remove the format Epub --> crash
> >>>>>>>>>>>
> >>>>>>>>>>> There is no crash if
> >>>>>>>>>>> 	5. restart lyx
> >>>>>>>>>>> 	6. remove the format Epub      
> >>>>>>>>>> I can't reproduce.    
> >>>>>>>>> You probably need to recompile with "-D_GLIBCXX_DEBUG_PEDANTIC -D_GLIBCXX_DEBUG"
> >>>>>>>>>     
> >>>>>>>>>> Can you post your preferences file as it exists after
> >>>>>>>>>> (3)?    
> >>>>>>>>>     
> >>>>>>>>>> Do you save or apply after (4) or go right to step (5)?    
> >>>>>>>>> Apply only. But with save it is the same.    
> >>>>>>>> I can reproduce. In addition I get the following:
> >>>>>>>>
> >>>>>>>>   Error: attempt to subscript container with out-of-bounds index 21973, but 
> >>>>>>>>   container only holds 99 elements.
> >>>>>>>>
> >>>>>>>> Scott  
> >>>>>>> Here the message is:
> >>>>>>> /usr/include/c++/8/debug/vector:417:
> >>>>>>> Error: attempt to subscript container with out-of-bounds index 1899910496, 
> >>>>>>> but container only holds 98 elements.
> >>>>>>>
> >>>>>>> Objects involved in the operation:
> >>>>>>>     sequence "this" @ 0x0x555f98a58bc8 {
> >>>>>>>       type = std::__debug::vector<lyx::Graph::Vertex,
> >>>>>>> std::allocator<lyx::Graph::Vertex>  
> >>>>>>>> ; }  
> >>>>>>> Abort (core dumped)
> >>>>>>>
> >>>>>>> If using attached, I got no crash, but the list of indexes used while removing the
> >>>>>>> format is scarifying.
> >>>>>>>
> >>>>>>>  $ wc errors
> >>>>>>>  1014  5060 35805 errors
> >>>>>>>
> >>>>>>>  $ sort my_list | uniq
> >>>>>>> Graph.cpp (145): VERT-INDEX == 0
> >>>>>>> Graph.cpp (145): VERT-INDEX == 11
> >>>>>>> Graph.cpp (145): VERT-INDEX == 21972
> >>>>>>> Graph.cpp (145): VERT-INDEX == 24
> >>>>>>> Graph.cpp (145): VERT-INDEX == 32
> >>>>>>> Graph.cpp (145): VERT-INDEX == 32757
> >>>>>>> Graph.cpp (145): VERT-INDEX == 33
> >>>>>>> Graph.cpp (145): VERT-INDEX == 71
> >>>>>>> Graph.cpp (145): VERT-INDEX == 79
> >>>>>>> Graph.cpp (145): VERT-INDEX == 8
> >>>>>>> Graph.cpp (145): VERT-INDEX == 80
> >>>>>>> Graph.cpp (145): VERT-INDEX == 83
> >>>>>>>
> >>>>>>>  $ egrep 21972 my_list | wc
> >>>>>>>     377    1885   13949
> >>>>>>>
> >>>>>>>  $ egrep 32757 my_list | wc
> >>>>>>>     134     670    4958  
> >>>>>> I will have a look.  
> >>>>> I was able to reproduce with the cmake setting mentioned above, but now
> >>>>> I can't again. I have not been able to reproduce without those settings,
> >>>>> nor do I see the weird values. But something is obviously suspicious.
> >>>>>
> >>>>> When I did see the crash, it was coming from Converters::isReachable().
> >>>>> You could try something like the attached, which could yield more
> >>>>> information.  
> >>>> Sorry, changed wrong routine. Try this patch.
> >>>>
> >>>> Riki
> >>>>
> >>>>
> >>> To achieve the settings with gnu c++ compiler do:
> >>> with cmake: -DLYX_STDLIB_DEBUG=ON
> >>> with automake: --enable_stdlib_debug=yes
> >> I still can't get it to crash.
> >>
> >> Attached are the cmake settings I'm using. (This is generated by QtCreator.)
> >>
> >> Riki
> >>
> >>
> > Looks good.
> >
> > Step1 create forma epub and converter docbook5 -> epub
> >
> >  $ egrep -i epub preferences
> > \format "" "epub" "Epub" "" "" "" "" ""
> > \converter "docbook5" "" "dbtoepub  -o $$o $$i" ""
> >
> > Restart lyx
> > remove converter docbook5 -> epub
> > Apply!
> > remove format epub
> > Apply! --> crash
> >
> >  $ egrep -i epub preferences
> > \format "" "epub" "Epub" "" "" "" "" ""
> >
> > The converter is gone, but the format still exists
> 
> I still cannot reproduce this reliably. Probably best to file a bug.

Did we file a bug report for this? I used to be able to reproduce. I
tried to reproduce on current master and could not, but I'm not sure if
I'm still following the recipe correctly.

Scott
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