[petsc-users] Question about correctly catching fp_trap

Fri Jan 4 18:56:26 CST 2019

   Looks like spack did not compile PETSc with the -g option; which is strange because in both debug and and --with-debugging=0 PETSc ./configure make uses debug symbols

#0  __muldc3 (a=-6.6364040265716871e-306, b=1.1689456061105587e-305, c=-0.0024992568840190117, d=0.024886737403015963)
    at /raid/home/sajid/packages/spack/var/spack/stage/gcc-7.3.0-qrjpi76aeo4bysagruwwfii6oneh56lj/gcc-7.3.0/libgcc/libgcc2.c:1978
#1  0x00007ffff630fe87 in MatSolve_SeqAIJ_NaturalOrdering ()
   from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010

   Anyway the FPE occurs in MatSolve_SeqAIJ_NaturalOrdering which usually indicates a zero on the diagonal of the matrix. Is that possible?

   Barry

    Satish,

      Does spack somehow turn off the -g ?

> On Jan 4, 2019, at 3:24 PM, Sajid Ali <sajidsyed2021 at u.northwestern.edu> wrote:
> 
> Trying it slightly differently, I do see it's a SIGFPE, arithmetic exception but all it shows is that it's an error in TSSolve but no further than that. 
> 
> [sajid at xrm free_space]$ gdb ex_modify 
> GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-100.el7
> Copyright (C) 2013 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 "x86_64-redhat-linux-gnu".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>...
> Reading symbols from /raid/home/sajid/packages/xwp_petsc/2d/free_space/ex_modify...done.
> (gdb) run -ts_type cn --args -fp_trap
> Starting program: /raid/home/sajid/packages/xwp_petsc/2d/free_space/ex_modify -ts_type cn --args -fp_trap
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> warning: File "/raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-4.8.5/gcc-7.3.0-qrjpi76aeo4bysagruwwfii6oneh56lj/lib64/libstdc++.so.6.0.24-gdb.py" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load:/usr/bin/mono-gdb.py".
> To enable execution of this file add
>         add-auto-load-safe-path /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-4.8.5/gcc-7.3.0-qrjpi76aeo4bysagruwwfii6oneh56lj/lib64/libstdc++.so.6.0.24-gdb.py
> line to your configuration file "/raid/home/sajid/.gdbinit".
> To completely disable this security protection add
>         set auto-load safe-path /
> line to your configuration file "/raid/home/sajid/.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"
> Solving a linear TS problem on 1 processor
> mx : 512, my: 512 lambda : 1.239840e-10
> 
> Program received signal SIGFPE, Arithmetic exception.
> __muldc3 (a=-6.6364040265716871e-306, b=1.1689456061105587e-305, c=-0.0024992568840190117, d=0.024886737403015963)
>     at /raid/home/sajid/packages/spack/var/spack/stage/gcc-7.3.0-qrjpi76aeo4bysagruwwfii6oneh56lj/gcc-7.3.0/libgcc/libgcc2.c:1978
> 1978    /raid/home/sajid/packages/spack/var/spack/stage/gcc-7.3.0-qrjpi76aeo4bysagruwwfii6oneh56lj/gcc-7.3.0/libgcc/libgcc2.c: No such file or directory.
> Missing separate debuginfos, use: debuginfo-install blas-3.4.2-8.el7.x86_64 bzip2-libs-1.0.6-13.el7.x86_64 elfutils-libelf-0.168-8.el7.x86_64 elfutils-libs-0.168-8.el7.x86_64 glibc-2.17-196.el7.x86_64 lapack-3.4.2-8.el7.x86_64 libattr-2.4.46-12.el7.x86_64 libcap-2.22-9.el7.x86_64 libgfortran-4.8.5-16.el7.x86_64 libxml2-2.9.1-6.el7_2.3.x86_64 systemd-libs-219-42.el7_4.4.x86_64 xz-libs-5.2.2-1.el7.x86_64 zlib-1.2.7-17.el7.x86_64
> (gdb) bt
> #0  __muldc3 (a=-6.6364040265716871e-306, b=1.1689456061105587e-305, c=-0.0024992568840190117, d=0.024886737403015963)
>     at /raid/home/sajid/packages/spack/var/spack/stage/gcc-7.3.0-qrjpi76aeo4bysagruwwfii6oneh56lj/gcc-7.3.0/libgcc/libgcc2.c:1978
> #1  0x00007ffff630fe87 in MatSolve_SeqAIJ_NaturalOrdering ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #2  0x00007ffff5ba61a8 in MatSolve ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #3  0x00007ffff6bc8a55 in PCApply_ILU ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #4  0x00007ffff6cde6eb in PCApply ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #5  0x00007ffff6e3ad4a in KSP_PCApply ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #6  0x00007ffff6e3bc36 in KSPInitialResidual ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #7  0x00007ffff6dc0736 in KSPSolve_GMRES ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #8  0x00007ffff6e1158e in KSPSolve ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #9  0x00007ffff6fac311 in SNESSolve_KSPONLY ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #10 0x00007ffff6f346c7 in SNESSolve ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #11 0x00007ffff714d58b in TSTheta_SNESSolve ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #12 0x00007ffff714df63 in TSStep_Theta ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #13 0x00007ffff7053ebe in TSStep ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> ---Type <return> to continue, or q <return> to quit---
> #14 0x00007ffff70560bc in TSSolve ()
>    from /raid/home/sajid/packages/spack/opt/spack/linux-rhel7-x86_64/gcc-7.3.0/petsc-develop-2u6vuwagkoczyvnpsubzrubmtmpfhhkj/lib/libpetsc.so.3.010
> #15 0x000000000040271d in main (argc=5, argv=0x7fffffffce38) at /raid/home/sajid/packages/xwp_petsc/2d/free_space/ex_modify.c:183
> 