[petsc-users] About KSPConvergedReasonView

[Barry Smith]

  This is probably due to the final argument being a character string which PETSc has difficulty managing by default for Fortran.

  I just removed the format argument from the call so this problem will gone soon.

  You could just comment out the call for now and put a print statement in instead. 

  The problem will be fixed as soon as my merge request gets into master.
  
  Sorry about this.

  Barry



   

> On Aug 27, 2020, at 10:25 AM, Thibaut Appel <t.appel17 at imperial.ac.uk> wrote:
> 
> Dear PETSc users,
> 
> I found out that (at least in the master branch) that KSPReasonView has been recently deprecated in favor of KSPConvergedReasonView.
> 
> After changing my application code, I thought I was using the function correctly:
> 
>     CALL KSPGetConvergedReason(ksp,ksp_reason,ierr)
>     CHKERRA(ierr)
> 
>     IF (ksp_reason < 0) THEN
> 
>       CALL KSPConvergedReasonView(ksp,PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_DEFAULT,ierr)
>       CHKERRA(ierr)
> 
>     END IF
> 
> but I still get the following backtrace
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007ffff51dea59 in PetscObjectTypeCompare (obj=0x8,
>     type_name=0x7ffff75b5b88 "ascii", same=0x7fffffffd7b8)
>     at /home/Packages/petsc/src/sys/objects/destroy.c:160
> 160      else if (!type_name || !obj->type_name) *same = PETSC_FALSE;
> (gdb) bt
> #0  0x00007ffff51dea59 in PetscObjectTypeCompare (obj=0x8,
>     type_name=0x7ffff75b5b88 "ascii", same=0x7fffffffd7b8)
>     at /home/Packages/petsc/src/sys/objects/destroy.c:160
> #1  0x00007ffff6ba1d83 in KSPConvergedReasonView (ksp=0x555555bb2510, viewer=0x8,
>     format=PETSC_VIEWER_DEFAULT)
>     at /home/Packages/petsc/src/ksp/ksp/interface/itfunc.c:452
> #2  0x00007ffff6beb37a in kspconvergedreasonview_ (
>     ksp=0x55555593f3c0 <__solver_MOD_ksp>, viewer=0x7fffffffda50,
>     format=0x5555558fae48, __ierr=0x7fffffffda6c)
>     at /home/Packages/petsc/src/ksp/ksp/interface/ftn-auto/itfuncf.c:295
> #3  0x00005555555e040d in solver::solve_linear_problem (vec_rhs=..., vec_sol=...)
>     at mod_solver.F90:1872
> #4  0x0000555555614453 in solver::solve () at mod_solver.F90:164
> #5  0x00005555555ba3c6 in main () at main.F90:67
> #6  0x00005555555ba437 in main (argc=1, argv=0x7fffffffe17e) at main.F90:3
> #7  0x00007ffff46fa1e3 in __libc_start_main ()
>    from /usr/lib/x86_64-linux-gnu/libc.so.6
> #8  0x000055555555cd7e in _start ()
> 
> as if there was a type mismatch. Could anyone pinpoint what's wrong?
> 
> Thank you,
> 
> Thibaut
>