Segmentation fault on extrude

[sk]

If I run "gmsh atm2.geo" (cf. attachment) it opens a window but crashes before any interaction or display action happens.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gmsh 2.5.1~beta1~svn9724~dfsg-1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu3
Architecture: i386
CheckboxSubmission: 6e1841f6bc8ee04eadffe3696ff1f973
CheckboxSystem: 4189098363a6ad0365cb1899f85542bb
Date: Sat Nov 5 18:07:46 2011
EcryptfsInUse: Yes
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: gmsh
UpgradeStatus: Upgraded to oneiric on 2011-10-23 (13 days ago)

[Anton Gladky (gladky-anton)]

The question was redirected to GMSH-developers. They gave the following answer [1]:

================================================================

You should extrude with an angle strictly smaller than Pi.
Otherwise, there is a problem with indetermination.
Try:

// foil parameters
r1 = 2.0;
d = 0.1;
r2 = r1 + d;

// size parameters
h1 = 4.0;
h2 = 10.0;
b = 2*r2*1.1;

// Mesh
lc = 2*d;
lv = 5;

p1 = newp; Point(p1) = {r1 , 0, h1+d, lc};

wall[] = Extrude {0, 0, h2-h1-2*d} { Point{ p1 }; Layers{ lv }; };

wall1[] = Extrude { {0, 0, 1}, {0, 0, 0},Pi/2 } { Line { wall[1] }; };
wall2[] = Extrude { {0, 0, 1}, {0, 0, 0}, Pi/2 } { Line { wall1[0] }; };

wall3[] = Extrude { {0, 0, 1}, {0, 0, 0},-Pi/2 } { Line { wall[1] }; };
wall4[] = Extrude { {0, 0, 1}, {0, 0, 0},-Pi/2 } { Line { wall3[0] }; };

Regards,
Ruth

--
Dr. Ir. Ruth V. Sabariego

================================================================

Please, close the bug, if the problem is solved.

[1] http://geuz.org/pipermail/gmsh/2011/006829.html

[sk (s-karrmann)]

IMHO the program should at least report an error instead of seg-faulting.

Because of the work around, I'll close this bug.

[sk (s-karrmann)]

Well, it's not a fix but a work around.