[petsc-users] Question about correctly catching fp_trap

Fri Jan 4 19:29:48 CST 2019

On Fri, Jan 4, 2019 at 7:56 PM Smith, Barry F. via petsc-users <
petsc-users at mcs.anl.gov> wrote:

>
>    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 ?
>

I bet spack overrides the CFLAGS, which has the -g, instead of using
COPTFLAGS like we advise.

The amount of time spent working around spack FAR OUTWEIGHS any possible
benefit it might have. Just build the library, It takes 5 min.

   Matt

> > 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
> >
>
>

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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