Milos,

Here are the outputs of the "input" program running when it crashes while running the backtrace, and below that is the gdb output.


------------------------------------------------------------------------------------------------------------
mocha@mocha-c2d:~$ input
Yagi-Uda antenna analysis programs, version 1.19
Written by Dr. David Kirkby Ph.D. (G8WRB, email:<email address hidden>)

This program asks for length, diameter and position of antenna elements then
writes them to a file you specify. Data is written in m (metres)
 
Enter any notes on this design (up to 400 characters): test
Enter a filename to write data to testyagi
Enter the centre frequency in MHz 2400
Enter the minimum frequency in MHz 2100
Enter the maximum frequency in MHz 2600
Enter the frequency steps in MHz 50

Data can be entered in imperial (inches) metric (mm) or wavelengths (lambda)
Please enter i (for imperial), m (for metric) or w (for wavelengths). i
Enter the number of elements for the antenna 5
Enter the angular step size in degrees for the gain to be plotted 15
Are all the elements of the same diameter ? y
Enter the diameter of the elements (in "") 0.0625


Enter location of the driven element in "" (wrt. reflector at x=0) 1.21
Enter length of the driven element (in "") 2.42

Enter length of the reflector (in "") 2.6


Enter location of director 1 in "" (wrt. reflector at x=0.0) 2.42
Enter the length of director 1 (in "") 2.2


Enter location of director 2 in "" (wrt. reflector at x=0.0) 3.64
Enter the length of director 2 (in "") 2


Enter location of director 3 in "" (wrt. reflector at x=0.0) 4.84
Enter the length of director 3 (in "") 1.8
*** glibc detected *** input: munmap_chunk(): invalid pointer: 0x0804a7c3 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7e5a3f4]
input[0x8048e66]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5)[0xb7e01685]
input[0x80487d1]
======= Memory map: ========
08048000-0804c000 r-xp 00000000 08:02 1558124    /usr/bin/input
0804c000-0804e000 rw-p 00003000 08:02 1558124    /usr/bin/input
097e6000-09807000 rw-p 097e6000 00:00 0          [heap]
b7dea000-b7deb000 rw-p b7dea000 00:00 0 
b7deb000-b7f43000 r-xp 00000000 08:02 721575     /lib/tls/i686/cmov/libc-2.8.90.so
b7f43000-b7f45000 r--p 00158000 08:02 721575     /lib/tls/i686/cmov/libc-2.8.90.so
b7f45000-b7f46000 rw-p 0015a000 08:02 721575     /lib/tls/i686/cmov/libc-2.8.90.so
b7f46000-b7f49000 rw-p b7f46000 00:00 0 
b7f49000-b7f6d000 r-xp 00000000 08:02 721730     /lib/tls/i686/cmov/libm-2.8.90.so
b7f6d000-b7f6e000 r--p 00023000 08:02 721730     /lib/tls/i686/cmov/libm-2.8.90.so
b7f6e000-b7f6f000 rw-p 00024000 08:02 721730     /lib/tls/i686/cmov/libm-2.8.90.so
b7f84000-b7f91000 r-xp 00000000 08:02 720914     /lib/libgcc_s.so.1
b7f91000-b7f92000 r--p 0000c000 08:02 720914     /lib/libgcc_s.so.1
b7f92000-b7f93000 rw-p 0000d000 08:02 720914     /lib/libgcc_s.so.1
b7f93000-b7f97000 rw-p b7f93000 00:00 0 
b7f97000-b7fb1000 r-xp 00000000 08:02 721209     /lib/ld-2.8.90.so
b7fb1000-b7fb2000 r-xp b7fb1000 00:00 0          [vdso]
b7fb2000-b7fb3000 r--p 0001a000 08:02 721209     /lib/ld-2.8.90.so
b7fb3000-b7fb4000 rw-p 0001b000 08:02 721209     /lib/ld-2.8.90.so
bf99e000-bf9b3000 rw-p bffeb000 00:00 0          [stack]
Aborted
mocha@mocha-c2d:~$ 

-----------------------------------------------------------------------------------------------------------------------

mocha@mocha-c2d:~$ pidof input
25425
mocha@mocha-c2d:~$ gdb 2>&1 | tee gdb-input.txt
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
(gdb) handle SIG33 pass nostop noprint
Signal        Stop	Print	Pass to program	Description
SIG33         No	No	Yes		Real-time event 33
(gdb) set pagination 0
(gdb) attach
Argument required (process-id to attach).
(gdb) attach 25425
Attaching to process 25425
Reading symbols from /usr/bin/input...(no debugging symbols found)...done.
Reading symbols from /lib/tls/i686/cmov/libm.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libm.so.6
Reading symbols from /lib/tls/i686/cmov/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libc.so.6
Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux.so.2
(no debugging symbols found)
0xb7fb1430 in __kernel_vsyscall ()
(gdb) continue
Continuing.
(no debugging symbols found)

Program received signal SIGABRT, Aborted.
0xb7fb1430 in __kernel_vsyscall ()
(gdb) backtrace full
#0  0xb7fb1430 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb7e16880 in raise () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#2  0xb7e18248 in abort () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#3  0xb7e5410d in ?? () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#4  0xb7e5a3f4 in ?? () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#5  0x08048e66 in ?? ()
No symbol table info available.
#6  0xb7e01685 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#7  0x080487d1 in ?? ()
No symbol table info available.
(gdb) info registers
eax            0x0	0
ecx            0x6351	25425
edx            0x6	6
ebx            0x6351	25425
esp            0xbf9afe7c	0xbf9afe7c
ebp            0xbf9afe94	0xbf9afe94
esi            0x0	0
edi            0xb7f44ff4	-1208725516
eip            0xb7fb1430	0xb7fb1430 <__kernel_vsyscall+16>
eflags         0x246	[ PF ZF IF ]
cs             0x73	115
ss             0x7b	123
ds             0x7b	123
es             0x7b	123
fs             0x0	0
gs             0x33	51
(gdb) thread apply all backtrace
(gdb) quit
The program is running.  Quit anyway (and detach it)? (y or n) y
Detaching from program: /usr/bin/input, process 25425
mocha@mocha-c2d:~$