[petsc-users] CG+GAMG convergence issues in GHEP Krylov-Schur for some MPI runs

[Denis Davydov]

After running in debug mode it seems that the GAMG solver indeed did not
converge, however throwing the error leads to SIGABRT (backtrace and frames
are below).
It is still very suspicious why would solving for (unchanged) mass matrix
wouldn't converge inside SLEPc's spectral transformation.

p.s. valgrind takes enormous amount of time on this problem,
will try to leave it over the weekend.

Denis.

===============
Program received signal SIGABRT, Aborted.
0x00007fffea87fcc9 in __GI_raise (sig=sig at entry=6)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56      ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  0x00007fffea87fcc9 in __GI_raise (sig=sig at entry=6)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007fffea8830d8 in __GI_abort () at abort.c:89
#2  0x00007fffeb790c91 in PetscTraceBackErrorHandler (comm=0x2a09bd0,
    line=798, fun=0x7fffed0e24b9 <__func__.20043> "KSPSolve",
    file=0x7fffed0e1620
"/home/davydden/.hashdist/tmp/petsc-hujktg3j6hq7/src/ksp/ksp/interface/itfunc.c",
n=91, p=PETSC_ERROR_INITIAL,
    mess=0x7fffffffac30 "KSPSolve has not converged", ctx=0x0)
    at
/home/davydden/.hashdist/tmp/petsc-hujktg3j6hq7/src/sys/error/errtrace.c:243
#3  0x00007fffeb78b8b9 in PetscError (comm=0x2a09bd0, line=798,
    func=0x7fffed0e24b9 <__func__.20043> "KSPSolve",
    file=0x7fffed0e1620
"/home/davydden/.hashdist/tmp/petsc-hujktg3j6hq7/src/ksp/ksp/interface/itfunc.c",
n=91, p=PETSC_ERROR_INITIAL,
    mess=0x7fffed0e1e7a "KSPSolve has not converged")
    at
/home/davydden/.hashdist/tmp/petsc-hujktg3j6hq7/src/sys/error/err.c:377
#4  0x00007fffec75e1e7 in KSPSolve (ksp=0x367227d0, b=0x35b285c0,
x=0x35d89250)
    at
/home/davydden/.hashdist/tmp/petsc-hujktg3j6hq7/src/ksp/ksp/interface/itfunc.c:798
#5  0x00007fffe32a8657 in STMatSolve (st=0x3672d820, b=0x35b285c0,
    x=0x35d89250)
    at
/home/davydden/.hashdist/tmp/slepc-22nb32nbgvhx/src/sys/classes/st/interface/stsles.c:166
---Type <return> to continue, or q <return> to quit---q
Quit
(gdb) f 5
#5  0x00007fffe32a8657 in STMatSolve (st=0x3672d820, b=0x35b285c0,
    x=0x35d89250)
    at
/home/davydden/.hashdist/tmp/slepc-22nb32nbgvhx/src/sys/classes/st/interface/stsles.c:166
166       ierr = KSPSolve(st->ksp,b,x);CHKERRQ(ierr);
(gdb) f 4
#4  0x00007fffec75e1e7 in KSPSolve (ksp=0x367227d0, b=0x35b285c0,
x=0x35d89250)
    at
/home/davydden/.hashdist/tmp/petsc-hujktg3j6hq7/src/ksp/ksp/interface/itfunc.c:798
798       if (ksp->errorifnotconverged && ksp->reason < 0)
SETERRQ(comm,PETSC_ERR_NOT_CONVERGED,"KSPSolve has not converged");
(gdb) f 3
#3  0x00007fffeb78b8b9 in PetscError (comm=0x2a09bd0, line=798,
    func=0x7fffed0e24b9 <__func__.20043> "KSPSolve",
    file=0x7fffed0e1620
"/home/davydden/.hashdist/tmp/petsc-hujktg3j6hq7/src/ksp/ksp/interface/itfunc.c",
n=91, p=PETSC_ERROR_INITIAL,
    mess=0x7fffed0e1e7a "KSPSolve has not converged")
    at
/home/davydden/.hashdist/tmp/petsc-hujktg3j6hq7/src/sys/error/err.c:377
377       if (!eh) ierr =
PetscTraceBackErrorHandler(comm,line,func,file,n,p,lbuf,0);
(gdb) f 2
#2  0x00007fffeb790c91 in PetscTraceBackErrorHandler (comm=0x2a09bd0,
    line=798, fun=0x7fffed0e24b9 <__func__.20043> "KSPSolve",
    file=0x7fffed0e1620
"/home/davydden/.hashdist/tmp/petsc-hujktg3j6hq7/src/ksp/ksp/interface/itfunc.c",
n=91, p=PETSC_ERROR_INITIAL,
    mess=0x7fffffffac30 "KSPSolve has not converged", ctx=0x0)
    at
/home/davydden/.hashdist/tmp/petsc-hujktg3j6hq7/src/sys/error/errtrace.c:243
243         abort();
(gdb) f 1
#1  0x00007fffea8830d8 in __GI_abort () at abort.c:89
89      abort.c: No such file or directory.
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