Package: libfftw3-3
Version: 3.2.2-1
Severity: normal
Fortran programs using libfftw3-3 segfault on this machine, amd64, while
the
same programs run correctly on a i686 machine. Both machines are up-to-
date
testing. I have made a short example program showing the problem:
cgm@offnode5:~/QPO/waved$ cat badfftw3.f90
!***********************************************************************
! badfftw3.f90 test program for segfault
!
! compile: gfortran -lfftw3 -lm -o badfftw3 -Wall badfftw3.f90
!***********************************************************************
PROGRAM badfftw3
IMPLICIT NONE
INTEGER :: n,i
PARAMETER (n=2**7)
INTEGER, PARAMETER :: dc=kind(0.0D0)
INTEGER :: seed(3)
REAL :: R
REAL (KIND=dc) :: y(n)
COMPLEX (kind=dc) :: yfft(n),zfft(n)
INTEGER :: fplan,bplan !forward and backward plans
INTEGER, PARAMETER :: fftw_forward=-1
INTEGER, PARAMETER :: fftw_backward=+1
INTEGER, PARAMETER :: fftw_estimate=64
CALL dfftw_plan_dft_1d(fplan,n,yfft,yfft, fftw_forward,fftw_estimate)
CALL dfftw_plan_dft_1d(bplan,n,zfft,zfft, fftw_backward,fftw_estimate)
call itime(seed) ! seed the RNG
R=rand(seed(1)*seed(2)+seed(3))
DO i=1,n
y(i)=rand(0)
END DO
WRITE(*,*) 'setup'
!** find the FFT of the time series
yfft=y
WRITE(*,*) 'ready'
CALL dfftw_execute(fplan)
Write(*,*) 'fft'
zfft = yfft
Write(*,*) 'multiplied'
CALL dfftw_execute(bplan)
Write(*,*) 'inverted'
! unnecessary cleanup
CALL dfftw_destroy_plan(fplan)
CALL dfftw_destroy_plan(bplan)
END PROGRAM badfftw3
When I compile and run it:
cgm@offnode5:~/QPO/waved$ gfortran -lfftw3 -lm -o badfftw3 -Wall
badfftw3.f90
cgm@offnode5:~/QPO/waved$ ./badfftw3
setup
ready
Segmentation fault
On the 686 machine it runs to completion with no problems. In other
programs, a direct fft works but there is a segfault for an inverse fft.
It seems to be definitely architecture-dependent.
Other possibly useful information:
cgm@offnode5:~/QPO/waved$ ldd badfftw3
linux-vdso.so.1 => (0x00007fff67ce5000)
libfftw3.so.3 => /usr/lib/libfftw3.so.3 (0x00007f9824be3000)
libgfortran.so.3 => /usr/lib/libgfortran.so.3
(0x00007f98248fc000)
libm.so.6 => /lib/libm.so.6 (0x00007f9824679000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007f9824463000)
libc.so.6 => /lib/libc.so.6 (0x00007f9824102000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00007f9823ee5000)
/lib64/ld-linux-x86-64.so.2 (0x00007f9824efb000)
cgm@offnode5:~/QPO/waved$ apt-file find /usr/lib/libfftw3.so*
libfftw3-3: /usr/lib/libfftw3.so.3
libfftw3-3: /usr/lib/libfftw3.so.3.2.4
libfftw3-dev: /usr/lib/libfftw3.so
cgm@offnode5:~/QPO/waved$ apt-cache policy libfftw3-3
libfftw3-3:
Installed: 3.2.2-1
Candidate: 3.2.2-1
Version table:
*** 3.2.2-1 0
500 http://ftp.us.debian.org/debian/ testing/main amd64 Packages
100 /var/lib/dpkg/status
On the 686 machine, where everything works, things are the same except
that
the libfftw3-3 package is i386 instead of amd64.
Please let me know if additional information would be useful.
regards cgm
-- System Information:
Debian Release: wheezy/sid
APT prefers testing
APT policy: (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libfftw3-3 depends on:
ii libc6 2.11.2-11 Embedded GNU C Library:
Shared lib
libfftw3-3 recommends no packages.
Versions of packages libfftw3-3 suggests:
ii libfftw3-dev 3.2.2-1 library for computing Fast
Fourier
-- no debconf information
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