./match_pattern.out: malloc(): memory corruption: 0x0000000013a11600 *** Post: 302553849

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Top Forums Programming ./match_pattern.out: malloc(): memory corruption: 0x0000000013a11600 *** Post 302553849 by JohnGraham on Friday 9th of September 2011 02:56:10 AM

09-09-2011

Registered User

Quote:

Originally Posted by shoaibjameel123

I reckon its the problem with malloc(), free() pair.

Memory corruption is normally due to you straying outside the bounds of an array - not with malloc()/free() statements matching up. You've probably overwritten some of the space next to a malloc()'d portion of memory that glibc expects to be able to use for keeping track of the memory region - go through with a debugger and have a look for bounds errors.

As an aside, here's the sort of thing you can expect if you did have a problem with malloc()/free() pairs:

Code:

[john@john-laptop tmp.u6Q7IbZntd]$ cat prog.c
#include <stdlib.h>

int main(void)
{
    void *p = malloc(1);
    free(p);
    free(p);
    return 0;
}
[john@john-laptop tmp.u6Q7IbZntd]$ gcc prog.c -o prog
[john@john-laptop tmp.u6Q7IbZntd]$ ./prog
*** glibc detected *** ./prog: double free or corruption (fasttop): 0x09ba3008 ***
======= Backtrace: =========
/lib/libc.so.6(+0x6c501)[0x58b501]
/lib/libc.so.6(+0x6dd70)[0x58cd70]
/lib/libc.so.6(cfree+0x6d)[0x58fe5d]
./prog[0x8048425]
/lib/libc.so.6(__libc_start_main+0xe7)[0x535ce7]
./prog[0x8048361]
======= Memory map: ========
0051f000-00676000 r-xp 00000000 08:04 2793795    /lib/libc-2.12.1.so
00676000-00678000 r--p 00157000 08:04 2793795    /lib/libc-2.12.1.so
00678000-00679000 rw-p 00159000 08:04 2793795    /lib/libc-2.12.1.so
00679000-0067c000 rw-p 00000000 00:00 0 
0091c000-0091d000 r-xp 00000000 00:00 0          [vdso]
00ab9000-00ad3000 r-xp 00000000 08:04 2793551    /lib/libgcc_s.so.1
00ad3000-00ad4000 r--p 00019000 08:04 2793551    /lib/libgcc_s.so.1
00ad4000-00ad5000 rw-p 0001a000 08:04 2793551    /lib/libgcc_s.so.1
00dd4000-00df0000 r-xp 00000000 08:04 2793792    /lib/ld-2.12.1.so
00df0000-00df1000 r--p 0001b000 08:04 2793792    /lib/ld-2.12.1.so
00df1000-00df2000 rw-p 0001c000 08:04 2793792    /lib/ld-2.12.1.so
08048000-08049000 r-xp 00000000 08:04 1220779    /tmp/tmp.u6Q7IbZntd/prog
08049000-0804a000 r--p 00000000 08:04 1220779    /tmp/tmp.u6Q7IbZntd/prog
0804a000-0804b000 rw-p 00001000 08:04 1220779    /tmp/tmp.u6Q7IbZntd/prog
09ba3000-09bc4000 rw-p 00000000 00:00 0          [heap]
b7500000-b7521000 rw-p 00000000 00:00 0 
b7521000-b7600000 ---p 00000000 00:00 0 
b76fc000-b76fd000 rw-p 00000000 00:00 0 
b7714000-b7716000 rw-p 00000000 00:00 0 
bffdf000-c0000000 rw-p 00000000 00:00 0          [stack]
Aborted

JohnGraham

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plotit

plotit(1)						      General Commands Manual							 plotit(1)

NAME

       plotit - experiment data visualization

SYNOPSIS

       plotit -w FILE
       plotit [-lp] -q FILE [FILE]...
       plotit [-lp] Y FILE [FILE...]
       plotit [-lp] X Y FILE [FILE...]

DESCRIPTION

       The  plotit program is a simple plotting program which can draw line plots and stripcharts using a command language similar to that of gnu-
       plot.  It can also make quick plots of multiple data files from the command-line.  Wildcards may be used in the file names.

       The program takes optional expressions which can be used to manipulate data columns before plotting.  Expressions may be as simple  as  the
       designation  of	a  column  to  be  plotted or may contain arithmetic expressions and functions.  In the latter case the espression must be
       enclosed in 'single' or "double" quotation marks. Column numbers are designated by the at-sign character (@).  A single expression is  used
       for the Y axis of the plot.

OPTIONS

       -h, --help
	      Print the usage and exit.

       --version
	      Print the version number and exit.

       -w     Watch  the input file for commands to stripchart, or wait to read all of stdin before plotting.  Only one file or - for stdin may be
	      specified with this option.  No other options may be used in conjuction with this option.

       -q     Plot the first and second columns of each file.

       -l     Plot with lines.

       -p     Plot with points.

EXAMPLES

       Plot the second column versus the first of all three files with lines only.

	      plotit -lq file1.dat file2.dat file3.dat

       Plot the quotient of the third column and the second column versus the first column of all files matching the pattern using points only.

	      plotit -p '@3/@2' file??.dat

       Plot the natural log of the second column divided by the third column versus the fourth column.	By default these  data	are  plotted  with
       both lines and points.

	      plotit @4 'log(@2/@3)' file.dat

AUTHOR

       This manual page was written by Carlo Segre <segre@iit.edu>.

								 February 21, 2009							 plotit(1)