[Q-e-developers] Using Valgrind and GDB with QE
Ye Luo
xw111luoye at gmail.com
Thu May 5 19:31:01 CEST 2016
It doesn't seem to be a libc bug.
The call stack shows that in the subroutine check_quantity_dh of your
module mbdvdw,
the code failed in writing something into tgg_complex which seems to be a
variable belongs to your module.
Is this variable dynamically allocatable and not initialized?
Ye
===================
Ye Luo, Ph.D.
Leadership Computing Facility
Argonne National Laboratory
2016-05-05 12:14 GMT-05:00 Hsin-Yu Ko <hsinyu at princeton.edu>:
> Thomas,
>
> That is interesting. What you are seeing seems to be a libc bug [1]. I
> have encountered something similar last month. I fixed the problem on my
> machine by recompiling glibc with debug features enabled (I am not sure
> how useful gentoo documentation is but I put the reference here just in
> case [2]). I think removing -pg may be a quick fix according to [1].
>
> Best,
> Hsin-Yu
>
> [1] http://valgrind-users.narkive.com/MPnV7HOw/gcc-pg-valgrind-errors
> [2] https://wiki.gentoo.org/wiki/Debugging
>
> On 05/05/2016 12:34 PM, Thomas Markovich wrote:
> > Hsin-Yu,
> >
> > Thank you for the suggestion!
> >
> > I had -g in LDFLAGS:
> > LDFLAGS = -g -pthread -fopenmp
> >
> > but nothing equivalent in CFLAGS, which was defined as:
> > CFLAGS = -O3 $(DFLAGS) $(IFLAGS)
> >
> > I have since gone ahead and changed CFLAGS to
> > CFLAGS = -Og -g $(DFLAGS) $(IFLAGS)
> >
> > The resulting fortran compile statements look something like:
> > mpif90 -Og -g -pg -fopenmp -Wall -Wextra -Warray-temporaries
> > -Wconversion -fbacktrace -ffree-line-length-0 -finit-real=nan
> > -ffpe-trap=zero,invalid,zero,overflow -x f95-cpp-input -fopenmp
> > -D__GFORTRAN -D__STD_F95 -D__FFTW -D__MPI -D__PARA -D__SCALAPACK
> > -D__OPENMP -I../include -I../iotk/src -I../ELPA/src -I. -c mbdvdw.f90
> >
> > and reran valgrind. It gave the following output:
> >
> > ==30486== Invalid write of size 8
> > ==30486== at 0x1002735ED: __mbdvdw_module_MOD_mbdvdw_tgg_complex (in
> > /Users/tmarkovich/bin/pw.x)
> > ==30486== by 0x100290F58:
> > __mbdvdw_module_MOD_mbdvdw_check_quantity_dh (in
> /Users/tmarkovich/bin/pw.x)
> > ==30486== Address 0x1037989f0 is 0 bytes after a block of size 1,728
> > alloc'd
> > ==30486== at 0x10092B4AB: malloc (in
> >
> /usr/local/Cellar/valgrind/HEAD/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
> > ==30486== by 0x10028FEE2:
> > __mbdvdw_module_MOD_mbdvdw_check_quantity_dh (in
> /Users/tmarkovich/bin/pw.x)
> > ==30486== by 0x1001D4567: v_of_rho_ (in /Users/tmarkovich/bin/pw.x)
> > ==30486== by 0x10007C0BE: electrons_scf_ (in
> /Users/tmarkovich/bin/pw.x)
> > ==30486== by 0x10007D385: electrons_ (in /Users/tmarkovich/bin/pw.x)
> > ==30486== by 0x10018B30B: run_pwscf_ (in /Users/tmarkovich/bin/pw.x)
> > ==30486== by 0x100001157: MAIN__ (pwscf.f90:30)
> > ==30486== by 0x1004EC496: main (pwscf.f90:14)
> >
> > This appears to not have changed much.
> >
> > Best,
> > Thomas
> >
> > On Thu, May 5, 2016 at 10:15 AM, Hsin-Yu Ko <hsinyu at princeton.edu
> > <mailto:hsinyu at princeton.edu>> wrote:
> >
> > Hi Thomas,
> >
> > Did you put -g in CFLAGS and LDFLAGS? Valgrind seems to recognize
> some
> > lines inside MAIN__ while failing to find the linked ones.
> >
> > Best,
> > Hsin-Yu
> >
> > On 05/05/2016 09:48 AM, Thomas Markovich wrote:
> > > Hi,
> > >
> > > I'm preparing to push my module that implements the Many Body
> > Dispersion
> > > van der Waals correction, and all associated forces. As a last
> > thing, I
> > > ran my code through valgrind, and it seems to have popped up a
> > couple of
> > > remaining things that I would like to fix before release[1].
> > > Unfortunately, the valgrind output below is less than clear on
> where
> > > exactly the error is, and it doesn't give any important line
> numbers.
> > > Beyond this, addr2line gives thoroughly unhelpful output:
> > > ▶ gaddr2line -e pw.x 0x100520518
> > > ??:0.
> > >
> > > I have compiled QE given the following flags with gfortran 4.9:
> > > FFLAGS = -Og -g -pg -fopenmp -fbacktrace -fcheck=all
> > > -finit-real=nan -ffpe-trap=zero,invalid,zero,overflow
> > >
> > > Is there any way to compile QE such that it generates all the
> > debugging
> > > symbols, so that I can get more readable and informative output
> from
> > > valgrind? I thought all I needed was the -g flag, but it appears
> > that I
> > > might need more?
> > >
> > > Best,
> > > Thomas Markovich
> > >
> > > [1]
> > > ==10233== Invalid write of size 8
> > > ==10233== at 0x100520518:
> > __mbdvdw_module_MOD_mbdvdw_tgg_complex (in
> > > /Users/tmarkovich/bin/pw.x)
> > > ==10233== by 0x100555A88:
> > > __mbdvdw_module_MOD_mbdvdw_check_quantity_dh (in
> > /Users/tmarkovich/bin/pw.x)
> > > ==10233== Address 0x103131248 is 8 bytes after a block of size
> 1,728
> > > alloc'd
> > > ==10233== at 0x1011814AB: malloc (in
> > >
> >
> /usr/local/Cellar/valgrind/HEAD/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
> > > ==10233== by 0x1005547B0:
> > > __mbdvdw_module_MOD_mbdvdw_check_quantity_dh (in
> > /Users/tmarkovich/bin/pw.x)
> > > ==10233== by 0x1003D56E4: v_of_rho_ (in
> /Users/tmarkovich/bin/pw.x)
> > > ==10233== by 0x1000F540B: electrons_scf_ (in
> > /Users/tmarkovich/bin/pw.x)
> > > ==10233== by 0x1000F6E18: electrons_ (in
> > /Users/tmarkovich/bin/pw.x)
> > > ==10233== by 0x10032AA28: run_pwscf_ (in
> > /Users/tmarkovich/bin/pw.x)
> > > ==10233== by 0x1000010BB: MAIN__ (pwscf.f90:30)
> > > ==10233== by 0x100B67C1F: main (pwscf.f90:14)
> > _______________________________________________
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> >
> >
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