inkscape crashed with SIGSEGV in Avoid::VertInf::removeFromGraph()

[Arthur Rodrigues]

I was having huge difficulties to finish an image in which I was using diagram connectors to draw arrows between circles (a graph, for those who know what it is).

At some point, I needed to draw the curved arrows in the image attached, and every time I needed to move the drawing or do anything with the arrows, like changing the markers' colors, these curved arrows kept turning into straight ones again, over and over.

After a million times going like this, I asked inkscape to render a latex formula for me and, when the formula was ready, the arrows simply disappeared!

This is everything that I remember happening before the crash.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: inkscape 0.48.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
Uname: Linux 3.0.0-17-generic i686
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Mon Apr 9 02:49:18 2012
ExecutablePath: /usr/bin/inkscape
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcCmdline: inkscape
SegvAnalysis:
 Segfault happened at: 0x8822f11 <_ZN5Avoid7VertInf15removeFromGraphEb+17>: cmpb $0x0,0x8(%esi)
 PC (0x08822f11) ok
 source "$0x0" ok
 destination "0x8(%esi)" (0x00000008) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: inkscape
Stacktrace:
 #0 0x08822f11 in Avoid::VertInf::removeFromGraph(bool) ()
 No symbol table info available.
 Não é possível acessar a memória no endereço 0xbfdedfac
StacktraceTop: Avoid::VertInf::removeFromGraph(bool) ()
Title: inkscape crashed with SIGSEGV in Avoid::VertInf::removeFromGraph()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: admin audio cdrom colord dialout fax fuse plugdev pulse-access saned scanner sudo users vboxusers voice

[Apport retracing service (apport)]

StacktraceTop: Avoid::VertInf::removeFromGraph(bool) ()

[Alex Valavanis (valavanisalex)]

Possible duplicates..?

bug #965051 <inkscape hangs when edit/cut objects>
bug #837631 <Crash when grouping objects+connectors across different layers>

[su_v (suv-lp)]

Alex Valavanis wrote:
> Possible duplicates..?
>
> bug #965051 <inkscape hangs when edit/cut objects>
> bug #837631 <Crash when grouping objects+connectors across different layers>

Based on the backtrace, possibly - but without the SVG file the reported crash cannot be further investigated (a screenshot or bitmap export doesn't really help).

Arthur Rodrigues wrote:
> At some point, I needed to draw the curved arrows in the image
> attached, and every time I needed to move the drawing or do anything
> with the arrows, like changing the markers' colors, these curved
> arrows kept turning into straight ones again, over and over.

Connectors do not keep manual edits - they are lost each time a reouting of the connectors is triggered (see also bug #168748, bug #740802 and bug #942308). Either draw regular paths with the pen tool, or adjust the curvature of the connectors using the options on the connector tool controls bar.

Related manual section:
<http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Connectors-Modifying.html#Connectors-Modifying-Routing>

[Arthur Rodrigues (araruna)]

Well, there is the svg I was working on. I don't remember changing it much after I filed this bug., but I don't guarantee it.
When I opened it a few seconds ago, the arrows dislayed in the png I attached earlier were completely messed up.

I don't remember if I told what version of inkscape I was using, but either way, it's the 0.48.3.1 r9886 (according tho the "About inkscape" menu option).

I remember that even if I deleted the messed edges and recreated them (using the connector), the problem still happened.

Thanks for your time,

[jazzynico (jazzynico)]

Since the document has only one layer, it's more likely a duplicate of bug #965051 <inkscape hangs when edit/cut objects>.
But I still can't reproduce it with the attached file (didn't try too hard, though).

[su_v (suv-lp)]

Steps to reproduce a crash (unclear to me though whether this is what happened to the reporter):
1) open 'todos.svg'
2) select the group of connectors for the bottom-left diagram
   (note: only one of them initially appears to connect two of the circles, the others have zero-length at the SVG origin -> this is tracked already in other reports)
3) ungroup it
   (connectors are now rendered at expected positions)
4) drag a selection frame around the bottom-left diagram
5) group the selection

-> crash (see attached backtrace from r11513, OS X 10.7.4, 64bit).

[jazzynico (jazzynico)]

On the other hand, bug #837631 <Crash when grouping objects+connectors across different layers> is more about grouping than layers...

[jazzynico (jazzynico)]

Reproduced on Ubuntu 11.04, Inkscape trunk revision 11513.
"Fixing" as explained bug #837631 comment #6 doesn't work here.

[jazzynico (jazzynico)]

Also crashes on Windows XP, Inkscape trunk revision 12228.

[Johan Engelen (johanengelen)]

fixed in rev. 13413

because of constructor "ConnRef(Router *router, const unsigned int id)", _srcVert and _dstVert can be NULL, and _active can be false. this constructor seems unfinished, but is used elsewhere in the code. hence the crash.

[Johan Engelen (johanengelen)]

correction: fixed in experimental rev 13413, trunk rev 13444

[Alex Valavanis (valavanisalex)]

Fix committed upstream (not committed in Ubuntu yet)