[petsc-dev] Valgrind problems

[Matthew Knepley]

On Sat, Dec 7, 2019 at 4:04 PM Patrick Sanan <patrick.sanan at gmail.com>
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:
>

Thats the one. I ran valgrind directly and cannot get this.

   Matt


> $ 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/>
>
>
>

-- 
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/>
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