[Dune] [#576] Yasp-grid probably triggers a GCC bug (Attachment added)

[Dune]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Andreas Lauser (andlaus) 

Attached to Project - Dune
Summary - Yasp-grid probably triggers a GCC bug
Task Type - Bug Report
Category - Grid
Status - Unconfirmed
Assigned To - 
Operating System - Linux
Severity - High
Priority - Normal
Reported Version - SVN
Due in Version - Undecided
Due Date - Undecided
Details - If the attached file is compiled without optimizations, it crashes in yasp-grid with the following backtrace:

Program received signal SIGSEGV, Segmentation fault.
0x000000000040276a in Dune::MultiYGrid<2, double>::maxlevel (this=0x48e8758b48ffffc2) at ../../dune/grid/yaspgrid/grids.hh:1801
1801              return _maxlevel;
(gdb) bt
#0  0x000000000040276a in Dune::MultiYGrid<2, double>::maxlevel (this=0x48e8758b48ffffc2) at ../../dune/grid/yaspgrid/grids.hh:1801
#1  0x00000000004027c9 in Dune::YaspEntity<0, 2, Dune::YaspGrid<2> const>::isLeaf (this=0x7fffdf82e218) at ../../dune/grid/yaspgrid.hh:812
#2  0x00000000004059d7 in Dune::YaspEntity<0, 2, Dune::YaspGrid<2> const>::ileafbegin (this=0x7fffdf82e218) at ../../dune/grid/yaspgrid.hh:825
#3  0x0000000000405a2a in Dune::Entity<0, 2, Dune::YaspGrid<2> const, Dune::YaspEntity>::ileafbegin (this=0x7fffdf82e218) at ../../dune/grid/common/entity.hh:352
#4  0x0000000000405a96 in MyTest::foo (this=0x7fffdf82e180, element=@0x7fffdf82e388) at test-yaspgrid.cc:32
#5  0x000000000040172f in main (argc=1, argv=0x7fffdf82e528) at test-yaspgrid.cc:64

This seems to be a bug in GCC 4.x, as there are no problems when using -O2, or SGrid. I've verified, that this happens for GCC 4.3.1 and GCC 4.2.3. Since my knowledge about YASP is quite limited, I could not come up with a work-around, but IMHO Yasp-grid should work for this code.  The following dune-control command can be used to trigger the bug:

 ./dune-common/bin/dunecontrol --configure-opts="CXXFLAGS='-g -Wall'" all




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More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=576

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