Petsc error after implicit time stepping in 1D acoustics run with nose

[mparsani]

FAILED (errors=1)
[0]PETSC ERROR: ------------------------------------------------------------------------
[0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation, probably memory access out of range
[0]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger
[0]PETSC ERROR: or see http://www.mcs.anl.gov/petsc/petsc-as/documentation/faq.html#valgrind[0]PETSC ERROR: or try http://valgrind.org on GNU/linux and Apple Mac OS X to find memory corruption errors
[0]PETSC ERROR: likely location of problem given in stack below
[0]PETSC ERROR: --------------------- Stack Frames ------------------------------------
[0]PETSC ERROR: Note: The EXACT line numbers in the stack are not available,
[0]PETSC ERROR: INSTEAD the line number of the start of the function
[0]PETSC ERROR: is given.
application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0
[unset]: aborting job:
application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0

[ahmadia]

I am going to try and reproduce this on my local workstation and report back when I have a more clear idea of where the problem is.

[mparsani]

This issue is not solved. However, we are going to abandon the implicit TS implemented in PETSc. We want to implement our own time integrators. In future, implicit TS in PETSc could be reconsidered, e.g. if we want to compare the CPU time of the two approaches (TS in PETSc are written in C; in PetClaw in Python).
Thus I close it.