dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

Anders Logg wrote:
> On Wed, Dec 02, 2009 at 11:24:56AM +0100, Johannes Ring wrote:
>> On Wed, Dec 2, 2009 at 11:02 AM, Johannes Ring <johannr@xxxxxxxxx> wrote:
>>> On Wed, Dec 2, 2009 at 10:58 AM, Anders Logg <logg@xxxxxxxxx> wrote:
>>>> On Wed, Dec 02, 2009 at 10:24:18AM +0100, Johannes Ring wrote:
>>>>> Hi,
>>>>>
>>>>> Someone pushed the Force Build button on the winxp-mingw32 slave. I
>>>>> don't see a good reason for this since the demo.log shows it quite
>>>>> clearly why it fails:
>>>>>
>>>>> http://fenics.org:8080/builders/dolfin-winxp-mingw32/builds/11/steps/dolfin%20check/logs/demo.log
>>>>>
>>>>> The problem is the same as the hardy-i386 slave reports, that is, the
>>>>> following two demos exits with a segmentation fault:
>>>>>
>>>>> demo\pde\stokes\stabilized\cpp
>>>>> demo\pde\stokes\taylor-hood\cpp
>>>> I can't figure out why these fail. Valgrind does not complain on my
>>>> machine. Does anyone have a 32 bit system to test on?
>>> Yes, I have my laptop. I will try to do some debugging.
>> I got a segfault too. Here is the output from running
>> demo\pde\stokes\stabilized\cpp in gdb:
>>
>> johannr@simula-x61:cpp$ gdb ./demo
>> GNU gdb 6.8-debian
>> Copyright (C) 2008 Free Software Foundation, Inc.
>> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
>> This is free software: you are free to change and redistribute it.
>> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
>> and "show warranty" for details.
>> This GDB was configured as "i486-linux-gnu"...
>> (gdb) run
>> Starting program:
>> /home/johannr/src/bzr/dolfin/demo/pde/stokes/stabilized/cpp/demo
>> [Thread debugging using libthread_db enabled]
>> [New Thread 0xb536a6c0 (LWP 21306)]
>> Solving linear variational problem
>>   Matrix of size 8604 x 8604 has 174636 nonzero entries.
>>   Applying boundary conditions to linear system.
>>   Applying boundary conditions to linear system.
>>
>> Program received signal SIGSEGV, Segmentation fault.
>> [Switching to Thread 0xb536a6c0 (LWP 21306)]
>> 0xb7c265c8 in dolfin::Data::clear () from
>> /home/johannr/src/bzr/dolfin/local/lib/libdolfin.so.0
>> Current language:  auto; currently asm
>> (gdb) where
>> #0  0xb7c265c8 in dolfin::Data::clear () from
> 
> The line
> 
>   x.resize(0);
> 
> in the function Data::clear() in dolfin/function/Data.cpp looks
> suspicious. Could you try replacing that line with
> 
>   x.clear();
> 
> and see if that helps?
> 
> Garth, is there a reason for using x.resize(0) instead of x.clear()?
> 

No. It should be clear().

Garth

> --
> Anders
> 
> 
> 
>> /home/johannr/src/bzr/dolfin/local/lib/libdolfin.so.0
>> #1  0xb7ca13aa in dolfin::GenericFunction::restrict_as_ufc_function
>> (this=0xbfccd268, w=0x82ada80,
>>     element=@0x80f64a8, dolfin_cell=@0xbfccc8f8, ufc_cell=@0xbfccc88c,
>> local_facet=2)
>>     at dolfin/function/GenericFunction.cpp:62
>> #2  0xb7c8b780 in dolfin::Expression::restrict (this=0xbfccd268,
>> w=0x82ada80, element=@0x80f64a8,
>>     dolfin_cell=@0xbfccc8f8, ufc_cell=@0xbfccc88c, local_facet=2) at
>> dolfin/function/Expression.cpp:77
>> #3  0xb7c609b5 in dolfin::DirichletBC::compute_bc_topological
>> (this=0xbfccd55c, boundary_values=@0xbfccc9a8,
>>     data=@0xbfccc9c0) at dolfin/fem/DirichletBC.cpp:527
>> #4  0xb7c60e4c in dolfin::DirichletBC::compute_bc (this=0xbfccd55c,
>> boundary_values=@0xbfccc9a8, data=@0xbfccc9c0)
>>     at dolfin/fem/DirichletBC.cpp:488
>> #5  0xb7c64520 in dolfin::DirichletBC::apply (this=0xbfccd55c,
>> A=0xbfcccb58, b=0xbfcccb10, x=0x0)
>>     at dolfin/fem/DirichletBC.cpp:320
>> #6  0xb7c64a03 in dolfin::DirichletBC::apply (this=0xbfccd55c,
>> A=@0xbfcccb58, b=@0xbfcccb10)
>>     at dolfin/fem/DirichletBC.cpp:173
>> #7  0xb7c47d41 in dolfin::VariationalProblem::solve_linear
>> (this=0xbfccd2e0, u=@0xbfcccf9c)
>>     at dolfin/fem/VariationalProblem.cpp:204
>> #8  0xb7c48bbc in dolfin::VariationalProblem::solve (this=0x3,
>> u=@0x80f6648) at dolfin/fem/VariationalProblem.cpp:93
>> #9  0x08074a06 in main () at main.cpp:89
>> (gdb)
>>
>> ------------------------------------------------------------------------
>>
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