Pai,


> -- Configuring done
> CMake Warning at 
> /public/home/ZK/opt/dealii/deal.II-v9.1.1/share/deal.II/macros/macro_deal_ii_invoke_autopilot.cmake:54
>  
> (ADD_EXECUTABLE):
>    Cannot generate a safe linker search path for target step-2 because files
>    in some directories may conflict with libraries in implicit directories:
> 
>      link library [libmkl_gf_lp64.so] in 
> /public/software/compiler/intel/composer_xe_2018.u2/compilers_and_libraries_2018.2.199/linux/mkl/lib/intel64_lin
>  
> may be hidden by files in:
>        /public/software/compiler/intel/composer_xe_2018.u2/mkl/lib/intel64
>      link library [libmkl_intel_lp64.so] in 
> /public/software/compiler/intel/composer_xe_2018.u2/compilers_and_libraries_2018.2.199/linux/mkl/lib/intel64_lin
>  
> may be hidden by files in:
>        /public/software/compiler/intel/composer_xe_2018.u2/mkl/lib/intel64
>      link library [libmkl_intel_thread.so] in 
> /public/software/compiler/intel/composer_xe_2018.u2/compilers_and_libraries_2018.2.199/linux/mkl/lib/intel64_lin
>  
> may be hidden by files in:
>        /public/software/compiler/intel/composer_xe_2018.u2/mkl/lib/intel64
>      link library [libmkl_core.so] in 
> /public/software/compiler/intel/composer_xe_2018.u2/compilers_and_libraries_2018.2.199/linux/mkl/lib/intel64_lin
>  
> may be hidden by files in:
>        /public/software/compiler/intel/composer_xe_2018.u2/mkl/lib/intel64

This is concerning. Do you have two different versions of the MKL installed? 
That is generally not useful nor, as the warning says, safe.


> *And the following is the error I got when I run step-2 by "gdb ./step-2":*
> GNU gdb (GDB) Red Hat Enterprise Linux (7.2-75.el6)
> Copyright (C) 2010 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html 
> <https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgnu.org%2Flicenses%2Fgpl.html&data=02%7C01%7CWolfgang.Bangerth%40colostate.edu%7Cade479cf246a4a6b7f4d08d76cbb5c3f%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637097424282089100&sdata=aJonaqKT57ko5fmt%2FA3R9eLXN3fvkkFblACqYpRJvSc%3D&reserved=0>>
> 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 "x86_64-redhat-linux-gnu".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/ 
> <https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.gnu.org%2Fsoftware%2Fgdb%2Fbugs%2F&data=02%7C01%7CWolfgang.Bangerth%40colostate.edu%7Cade479cf246a4a6b7f4d08d76cbb5c3f%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637097424282099098&sdata=u6pGrXw22F%2FzJ2WEL7sUUePxe45EpfGKAUnrTnMJAjs%3D&reserved=0>>...
> Reading symbols from 
> /public/home/ZK/opt/dealii/deal.II-v9.1.1/examples/step-2/step-2...done.
> (gdb) r
> Starting program: 
> /public/home/ZK/opt/dealii/deal.II-v9.1.1/examples/step-2/step-2
> [Thread debugging using libthread_db enabled]
> warning: File 
> "/public/software/compiler/gcc/5.4.0/lib64/libstdc++.so.6.0.21-gdb.py 
> <https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fso.6.0.21-gdb.py&data=02%7C01%7CWolfgang.Bangerth%40colostate.edu%7Cade479cf246a4a6b7f4d08d76cbb5c3f%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637097424282099098&sdata=n3rGTmQSOqmR6lK49fkaVagN8A%2Bf5ISwKgYZ%2FYd1YpI%3D&reserved=0>"
>  
> auto-loading has been declined by your `auto-load safe-path' set to 
> "/usr/share/gdb/auto-load:/usr/lib/debug:/usr/bin/mono-gdb.py".
> To enable execution of this file add
>   add-auto-load-safe-path 
> /public/software/compiler/gcc/5.4.0/lib64/libstdc++.so.6.0.21-gdb.py 
> <https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fso.6.0.21-gdb.py&data=02%7C01%7CWolfgang.Bangerth%40colostate.edu%7Cade479cf246a4a6b7f4d08d76cbb5c3f%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637097424282099098&sdata=n3rGTmQSOqmR6lK49fkaVagN8A%2Bf5ISwKgYZ%2FYd1YpI%3D&reserved=0>
> line to your configuration file "/public/home/ZK/.gdbinit".
> To completely disable this security protection add
>   set auto-load safe-path /
> line to your configuration file "/public/home/ZK/.gdbinit".
> For more information about this security protection see the
> "Auto-loading safe path" section in the GDB manual.  E.g., run from the shell:
>   info "(gdb)Auto-loading safe path"
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007fffe9760615 in tbb::interface9::global_control::active_value(int) () 
> at 
> /public/home/ZK/opt/dealii/tmp/unpack/deal.II-v9.1.1/bundled/tbb-2018_U2/src/tbb/tbb_main.cpp:563
> 563     return controls[param]->active_value();

I have to admit that I don't know what this refers to. The place where I've 
seen these kinds of errors is if there are multiple versions of the Threading 
Building Blocks installed and/or if you compiled on our hardware platform and 
then run on a different hardware platform. I have a suspicion that it is 
related to the error you show: deal.II is compiled agains the version of the 
TBB that is bundled with deal.II, but then linked against the one on your 
system.

Best
  W.

-- 
------------------------------------------------------------------------
Wolfgang Bangerth          email:                 [email protected]
                            www: http://www.math.colostate.edu/~bangerth/

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