[petsc-users] Question about correctly catching fp_trap

Fri Jan 4 15:24:16 CST 2019

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
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