[petsc-users] valgrind error messages with PETSc V3.5.1

[Jed Brown]

Randall Mackie <rlmackie862 at gmail.com> writes:

> The attached small program, basically a call to PetscPrintf, gives the following valgrind errors:
>
> [rmackie ~/tst_petsc_problem] ./cmd_test
> ==24812== Invalid read of size 1
> ==24812==    at 0x4C2E500: __GI_strncpy (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==24812==    by 0x4EF5B4D: PetscStrncpy (str.c:335)
> ==24812==    by 0x4F334E0: petscprintf_ (zmprintf.c:54)
> ==24812==    by 0x400F28: MAIN__ (test.F90:11)
> ==24812==    by 0x400F9A: main (test.F90:16)
> ==24812==  Address 0x8cef9bb is 0 bytes after a block of size 11 alloc'd

Barry, this looks like you making PetscStrncpy behave unlike strncpy.

  https://bitbucket.org/petsc/petsc/commits/ff32304b6c2c50401fe7ef46e45693a4318e17f0

I'll note that I dislike having functions named after standard C
functions, but with different behavior (e.g., PetscStrcmp and
PetscStrncpy).  If you really want these different semantics, I'd rather
have different names.

> ==24812==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==24812==    by 0x6828BB4: ??? (in /usr/lib/x86_64-linux-gnu/libgfortran.so.3.0.0)
> ==24812==    by 0x68FBC97: _gfortran_string_trim (in /usr/lib/x86_64-linux-gnu/libgfortran.so.3.0.0)
> ==24812==    by 0x400EFD: MAIN__ (test.F90:11)
> ==24812==    by 0x400F9A: main (test.F90:16)
> ==24812== 
>
>
> The program was compiled with PETSc V3.5.1 and --download-mpich.
>
> The same program compiled with V3.4.4 and --download-mpich does not give these errors.
>
> It seems like an innocuous error, and I can certainly create a suppression file for it, but I thought I'd report it anyway.
> I get the same error on 2 different systems and I've tried 3 different gfortran versions, all with the same result.
>
> Program, configure commands, etc, attached.
>
> Randy M.
>
>
> [rmackie ~/tst_petsc_problem] ./cmd_test
> ==24812== Invalid read of size 1
> ==24812==    at 0x4C2E500: __GI_strncpy (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==24812==    by 0x4EF5B4D: PetscStrncpy (str.c:335)
> ==24812==    by 0x4F334E0: petscprintf_ (zmprintf.c:54)
> ==24812==    by 0x400F28: MAIN__ (test.F90:11)
> ==24812==    by 0x400F9A: main (test.F90:16)
> ==24812==  Address 0x8cef9bb is 0 bytes after a block of size 11 alloc'd
> ==24812==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==24812==    by 0x6828BB4: ??? (in /usr/lib/x86_64-linux-gnu/libgfortran.so.3.0.0)
> ==24812==    by 0x68FBC97: _gfortran_string_trim (in /usr/lib/x86_64-linux-gnu/libgfortran.so.3.0.0)
> ==24812==    by 0x400EFD: MAIN__ (test.F90:11)
> ==24812==    by 0x400F9A: main (test.F90:16)
> ==24812== 
> ==24814== Invalid read of size 1
> ==24814==    at 0x4C2E500: __GI_strncpy (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==24814==    by 0x4EF5B4D: PetscStrncpy (str.c:335)
> ==24814==    by 0x4F334E0: petscprintf_ (zmprintf.c:54)
> ==24814==    by 0x400F28: MAIN__ (test.F90:11)
> ==24814==    by 0x400F9A: main (test.F90:16)
> ==24814==  Address 0x8cef5ab is 0 bytes after a block of size 11 alloc'd
> ==24814==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==24814==    by 0x6828BB4: ??? (in /usr/lib/x86_64-linux-gnu/libgfortran.so.3.0.0)
> ==24814==    by 0x68FBC97: _gfortran_string_trim (in /usr/lib/x86_64-linux-gnu/libgfortran.so.3.0.0)
> ==24814==    by 0x400EFD: MAIN__ (test.F90:11)
> ==24814==    by 0x400F9A: main (test.F90:16)
> ==24814== 
> ==24815== Invalid read of size 1
> ==24815==    at 0x4C2E500: __GI_strncpy (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==24815==    by 0x4EF5B4D: PetscStrncpy (str.c:335)
> ==24815==    by 0x4F334E0: petscprintf_ (zmprintf.c:54)
> ==24815==    by 0x400F28: MAIN__ (test.F90:11)
> ==24815==    by 0x400F9A: main (test.F90:16)
> ==24815==  Address 0x8cef51b is 0 bytes after a block of size 11 alloc'd
> ==24815==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==24815==    by 0x6828BB4: ??? (in /usr/lib/x86_64-linux-gnu/libgfortran.so.3.0.0)
> ==24815==    by 0x68FBC97: _gfortran_string_trim (in /usr/lib/x86_64-linux-gnu/libgfortran.so.3.0.0)
> ==24815==    by 0x400EFD: MAIN__ (test.F90:11)
> ==24815==    by 0x400F9A: main (test.F90:16)
> ==24815== 
> ==24813== Invalid read of size 1
> ==24813==    at 0x4C2E500: __GI_strncpy (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==24813==    by 0x4EF5B4D: PetscStrncpy (str.c:335)
> ==24813==    by 0x4F334E0: petscprintf_ (zmprintf.c:54)
> ==24813==    by 0x400F28: MAIN__ (test.F90:11)
> ==24813==    by 0x400F9A: main (test.F90:16)
> ==24813==  Address 0x8cef51b is 0 bytes after a block of size 11 alloc'd
> ==24813==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==24813==    by 0x6828BB4: ??? (in /usr/lib/x86_64-linux-gnu/libgfortran.so.3.0.0)
> ==24813==    by 0x68FBC97: _gfortran_string_trim (in /usr/lib/x86_64-linux-gnu/libgfortran.so.3.0.0)
> ==24813==    by 0x400EFD: MAIN__ (test.F90:11)
> ==24813==    by 0x400F9A: main (test.F90:16)
> ==24813== 
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