[petsc-dev] Valgrind problems

[Balay, Satish]

The fix for this is in 363424266cb675e6465b4c7dcb06a6ff8acf57d2

Do you have this commit in your branch - and still seeing issues?

Satish

On Sat, 7 Dec 2019, Patrick Sanan wrote:

> I was actually wondering about this, as in some cases valgrind errors appear and sometimes they don't, but I didn't dig into it too deeply.
> 
> Here's my workaround, FWIW, which shows some output for that test on master.
> 
> I don't see any output when I just run the tests like this:
> 
>     VALGRIND=1 make -f gmakefile.test test globsearch="dm_impls_plex_tests-ex1_fluent_2"
> 
> But I do see something if I do this to find any non-empty .err files:
> 
>     find $PETSC_ARCH/tests -name *.err ! -size 0
> 
> And then I see these valgrind warnings after copy-pasting the path:
> 
> 
> $ cat arch-master-extra-opt/tests/dm/impls/plex/examples/tests/runex1_fluent_2/runex1_fluent_2.err
> ==4990== Conditional jump or move depends on uninitialised value(s)
> ==4990==    at 0x4C3705A: rawmemchr (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==4990==    by 0x7687351: _IO_str_init_static_internal (strops.c:41)
> ==4990==    by 0x767878C: vsscanf (iovsscanf.c:40)
> ==4990==    by 0x76721A3: sscanf (sscanf.c:32)
> ==4990==    by 0x588147D: DMPlexCreateFluent_ReadSection (plexfluent.c:105)
> ==4990==    by 0x5882E3A: DMPlexCreateFluent (plexfluent.c:246)
> ==4990==    by 0x588492F: DMPlexCreateFluentFromFile (plexfluent.c:30)
> ==4990==    by 0x577E2B7: DMPlexCreateFromFile (plexcreate.c:3254)
> ==4990==    by 0x10BEDF: CreateMesh (ex1.c:170)
> ==4990==    by 0x10A20B: main (ex1.c:430)
> ==4990==  Uninitialised value was created by a stack allocation
> ==4990==    at 0x5881313: DMPlexCreateFluent_ReadSection (plexfluent.c:96)
> ==4990==
> ==4990== Use of uninitialised value of size 8
> ==4990==    at 0x766276F: _IO_vfscanf (vfscanf.c:633)
> ==4990==    by 0x767879C: vsscanf (iovsscanf.c:41)
> ==4990==    by 0x76721A3: sscanf (sscanf.c:32)
> ==4990==    by 0x588147D: DMPlexCreateFluent_ReadSection (plexfluent.c:105)
> ==4990==    by 0x5882E3A: DMPlexCreateFluent (plexfluent.c:246)
> ==4990==    by 0x588492F: DMPlexCreateFluentFromFile (plexfluent.c:30)
> ==4990==    by 0x577E2B7: DMPlexCreateFromFile (plexcreate.c:3254)
> ==4990==    by 0x10BEDF: CreateMesh (ex1.c:170)
> ==4990==    by 0x10A20B: main (ex1.c:430)
> ==4990==  Uninitialised value was created by a stack allocation
> ==4990==    at 0x5881313: DMPlexCreateFluent_ReadSection (plexfluent.c:96)
> ==4990==
> ==4990== Conditional jump or move depends on uninitialised value(s)
> ==4990==    at 0x766277B: _IO_vfscanf (vfscanf.c:630)
> ==4990==    by 0x767879C: vsscanf (iovsscanf.c:41)
> ==4990==    by 0x76721A3: sscanf (sscanf.c:32)
> ==4990==    by 0x588147D: DMPlexCreateFluent_ReadSection (plexfluent.c:105)
> ==4990==    by 0x5882E3A: DMPlexCreateFluent (plexfluent.c:246)
> ==4990==    by 0x588492F: DMPlexCreateFluentFromFile (plexfluent.c:30)
> ==4990==    by 0x577E2B7: DMPlexCreateFromFile (plexcreate.c:3254)
> ==4990==    by 0x10BEDF: CreateMesh (ex1.c:170)
> ==4990==    by 0x10A20B: main (ex1.c:430)
> ==4990==  Uninitialised value was created by a stack allocation
> ==4990==    at 0x5881313: DMPlexCreateFluent_ReadSection (plexfluent.c:96)
> ==4990==
> > Am 07.12.2019 um 21:45 schrieb Matthew Knepley <knepley at gmail.com>:
> > 
> > I am trying to clean up valgrind errors. However this one
> > 
> >   dm_impls_plex_tests-ex1_fluent_2
> > 
> > is valgrind clean on my machine. Does anyone get it to output something?
> > 
> >   Thanks,
> > 
> >      Matt
> > 
> > -- 
> > What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> > -- Norbert Wiener
> > 
> > https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
> 
>