gfortran problem

when I am running my fortran 90 code, i am getting an unusual problem.
While the code is compiling very well in intel compiler, its showing
following error while compiling with gfortran just before the end of
run:
######### calculation over
*** glibc detected *** /matsc/students/Rudra/Recursion/Real/run.out:
double free or corruption (out): 0xb7f79008 ***
======= Backtrace: =========
/lib/libc.so.6[0x5efac1]
/lib/libc.so.6(cfree+0x90)[0x5f30f0]
/usr/lib/libgfortran.so.1(_gfortran_internal_free+0x21)[0x24e0c1]
/matsc/students/Rudra/Recursion/Real/run.out[0x804a075]
/matsc/students/Rudra/Recursion/Real/run.out[0x804af1b]
/matsc/students/Rudra/Recursion/Real/run.out[0x804af47]
/lib/libc.so.6(__libc_start_main+0xe0)[0x59c390]
/matsc/students/Rudra/Recursion/Real/run.out[0x8048751]
======= Memory map: ========
00110000-00111000 r-xp 00110000 00:00 0 [vdso]
00242000-002c1000 r-xp 00000000 08:07 4259911 /usr/lib/libgfortran.so.
1.0.0
002c1000-002c2000 rwxp 0007e000 08:07 4259911 /usr/lib/libgfortran.so.
1.0.0
00567000-00582000 r-xp 00000000 08:07 4859005 /lib/ld-2.7.so
00582000-00583000 r-xp 0001a000 08:07 4859005 /lib/ld-2.7.so
00583000-00584000 rwxp 0001b000 08:07 4859005 /lib/ld-2.7.so
00586000-006d9000 r-xp 00000000 08:07 2457626 /lib/libc-2.7.so
006d9000-006db000 r-xp 00153000 08:07 2457626 /lib/libc-2.7.so
006db000-006dc000 rwxp 00155000 08:07 2457626 /lib/libc-2.7.so
006dc000-006df000 rwxp 006dc000 00:00 0
006e1000-00708000 r-xp 00000000 08:07 2457630 /lib/libm-2.7.so
00708000-00709000 r-xp 00026000 08:07 2457630 /lib/libm-2.7.so
00709000-0070a000 rwxp 00027000 08:07 2457630 /lib/libm-2.7.so
00aaa000-00ab5000 r-xp 00000000 08:07 2457634 /lib/
libgcc_s-4.1.2-20070925.so.1
00ab5000-00ab6000 rwxp 0000a000 08:07 2457634 /lib/
libgcc_s-4.1.2-20070925.so.1
08048000-0804c000 r-xp 00000000 00:11 5112713 /matsc/students/Rudra/
Recursion/Real/run.out
0804c000-0804d000 rw-p 00003000 00:11 5112713 /matsc/students/Rudra/
Recursion/Real/run.out
0906e000-090b2000 rw-p 0906e000 00:00 0
b7e00000-b7e21000 rw-p b7e00000 00:00 0
b7e21000-b7f00000 ---p b7e21000 00:00 0
b7f79000-b7fc1000 rw-p b7f79000 00:00 0
bf89f000-bf8b4000 rw-p bffea000 00:00 0 [stack]

Program received signal SIGABRT, Aborted.
0x00110402 in __kernel_vsyscall ()
Missing separate debuginfos, use: debuginfo-install gcc.i386
glibc.i686
(gdb) backtrace
#0 0x00110402 in __kernel_vsyscall ()
#1 0x005af690 in raise () from /lib/libc.so.6
#2 0x005b0f91 in abort () from /lib/libc.so.6
#3 0x005e79eb in __libc_message () from /lib/libc.so.6
#4 0x005efac1 in _int_free () from /lib/libc.so.6
#5 0x005f30f0 in free () from /lib/libc.so.6
#6 0x0024e0c1 in _gfortran_internal_free () from /usr/lib/
libgfortran.so.1
#7 0x0804a075 in coefficient_ (istart=@0xbf8b1eb4, lorbit=@0xbf8b1eac,
nrec=@0xbf8b1ea8, nsite=@0xbf8b1efc,
nmax=@0xbf8b1eb0, nn=@0xbf8b1ef8, cmat=0xbf8b1e50, dmat=0xbf8b1e08) at
coeff.f90:5
#8 0x0804af1b in MAIN__ () at main.f90:64
#9 0x0804af47 in main ()
(gdb)

can anybody tell me whats wrong? gfortran is working well elsewhere
.

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