[petsc-users] Error in Lapack xTREXC 1

[Nachiket Gokhale]

I am trying various options to solve a quadratic eigenvalue problem using
SlepC.   I get the following error message

Calling QEPSolve
[0]PETSC ERROR: --------------------- Error Message
------------------------------------
[0]PETSC ERROR: Error in external library!
[0]PETSC ERROR: Error in Lapack xTREXC 1!
[0]PETSC ERROR:
------------------------------------------------------------------------
[0]PETSC ERROR: Petsc Development GIT revision:
ff331c249a8bbf694711b310f25fec0e839b33db  GIT Date: 2013-05-19 22:14:01
-0500
[0]PETSC ERROR: See docs/changes/index.html for recent updates.
[0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[0]PETSC ERROR: See docs/index.html for manual pages.
[0]PETSC ERROR:
------------------------------------------------------------------------
[0]PETSC ERROR: /home/gokhale/hyser.clone/src/forward on a
linux-gcc-gpp-mumps named asd1.wai.com by gokhale Fri May 31 15:09:49 2013
[0]PETSC ERROR: Libraries linked from
/opt/petsc/petsc-git/linux-gcc-gpp-mumps/lib
[0]PETSC ERROR: Configure run at Mon May 20 17:02:54 2013
[0]PETSC ERROR: Configure options --download-blacs=1
--download-f-blas-lapack=1 --download-metis --download-mpich=yes
--download-mumps=yes --download-parmetis=1 --download-scalapack=1
--with-cc=/usr/local/bin/gcc --with-clanguage=C++
--with-cmake=/usr/bin/cmake28 --with-cxx=/usr/local/bin/g++
--with-debugging=0 --with-fc=/usr/local/bin/gfortran --with-mpi=1
--with-shared-libraries=1 --with-x11=0 --with-x=0
PETSC_ARCH=linux-gcc-gpp-mumps
[0]PETSC ERROR:
------------------------------------------------------------------------
[0]PETSC ERROR: DSSort_NHEP_Total() line 459 in
/opt/SlepC/slepc-git/src/ds/impls/nhep/dsnhep.c
[0]PETSC ERROR: DSSort_NHEP() line 493 in
/opt/SlepC/slepc-git/src/ds/impls/nhep/dsnhep.c
[0]PETSC ERROR: DSSort() line 510 in
/opt/SlepC/slepc-git/src/ds/interface/dsops.c
[0]PETSC ERROR: QEPSolve_QArnoldi() line 259 in
/opt/SlepC/slepc-git/src/qep/impls/qarnoldi/qarnoldi.c
[0]PETSC ERROR: QEPSolve() line 107 in
/opt/SlepC/slepc-git/src/qep/interface/qepsolve.c
[0]PETSC ERROR: solvecomplex() line 161 in
"unknowndirectory/"/home/gokhale/hyser.clone/lib/eqnlib/slepc_quad_system.cpp


I am not sure what it means; Google/mailing list search didn't seem to
help.  My command line is

~/hyser.clone/src/forward -qep_nev 10 -qep_ncv 32 -qep_monitor_conv
-qep_max_it 10000 -qep_smallest_imaginary -qep_type qarnoldi -qep_general
-qep_linear_explicitmatrix -qep_eps_type krylovschur   -qep_eps_shift -0.1

If it helps, the matrices are small  - 60x60.

-Nachiket
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