[petsc-users] sigsegvs

[Juha Jäykkä]

Hi list!

Petsc3.2-p7, make test fails and at a closer look, 
src/snes/examples/tutorials/ex19 gives:

orterun -n 1 ./ex19 -dmmg_nlevels 4 -snes_monitor_short -
on_error_attach_debugger
lid velocity = 0.0016, prandtl # = 1, grashof # = 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.
[0]PETSC ERROR: [0] VecNorm_Seq line 236 src/vec/vec/impls/seq/bvec2.c
[0]PETSC ERROR: [0] VecNormBegin line 479 src/vec/vec/utils/comb.c
[0]PETSC ERROR: [0] SNESSolve_LS line 142 src/snes/impls/ls/ls.c
[0]PETSC ERROR: [0] SNESSolve line 2647 src/snes/interface/snes.c
[0]PETSC ERROR: [0] DMMGSolveSNES line 538 src/snes/utils/damgsnes.c
[0]PETSC ERROR: [0] DMMGSolve line 303 src/snes/utils/damg.c
[0]PETSC ERROR: User provided function() line 0 in unknown directory unknown 
file  
--------------------------------------------------------------------------

Any idea where this could come from? Worst of all, if I run this in debugger, 
it never sigsegvs, likewise under valgrind. Sometimes (about 1/3) it also 
succeeds without a debugger, but even when not segfaulting, it gives wrong 
results (so I assume not segfaulting is just good (or bad?) luck):

2,5c2,3
<   0 SNES Function norm 0.0406612 
<   1 SNES Function norm 3.33175e-06 
<   2 SNES Function norm 1.092e-11 
< Number of Newton iterations = 2
---
>   0 SNES Function norm < 1.e-11
> Number of Newton iterations = 0
7,10c5,6
<   0 SNES Function norm 0.0406612 
<   1 SNES Function norm 3.33175e-06 
<   2 SNES Function norm 1.092e-11 
< Number of Newton iterations = 2
---
>   0 SNES Function norm < 1.e-11
> Number of Newton iterations = 0

Any help appreciated, thanks.
Juha

-- 
		 -----------------------------------------------
		| Juha Jäykkä, juhaj at iki.fi			|
		| http://koti.kapsi.fi/~juhaj/			|
		 -----------------------------------------------
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