./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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gensprep

gensprep(8)							 ICU 50.1.2 Manual						       gensprep(8)

NAME

       gensprep - compile StringPrep data from files filtered by filterRFC3454.pl

SYNOPSIS

       gensprep [ -h, -?, --help ] [ -v, --verbose ] [ -c, --copyright ] [ -s, --sourcedir source ] [ -d, --destdir destination ]

DESCRIPTION

       gensprep reads filtered RFC 3454 files and compiles their information into a binary form.  The resulting file, <name>.icu, can then be read
       directly by ICU, or used by pkgdata(8) for incorporation into a larger archive or library.

       The files read by gensprep are described in the FILES section.

OPTIONS

       -h, -?, --help
	      Print help about usage and exit.

       -v, --verbose
	      Display extra informative messages during execution.

       -c, --copyright
	      Include a copyright notice into the binary data.

       -s, --sourcedir source
	      Set the source directory to source.  The default source directory is specified by the environment variable ICU_DATA.

       -d, --destdir destination
	      Set the destination directory to destination.  The default destination directory is specified by the environment variable ICU_DATA.

ENVIRONMENT

       ICU_DATA  Specifies the directory containing ICU data. Defaults to /usr/share/icu/50.1.2/.  Some tools in ICU depend on the presence of the
		 trailing slash. It is thus important to make sure that it is present if ICU_DATA is set.

FILES

       The  following files are read by gensprep and are looked for in the source /misc for rfc3454_*.txt files and in source /unidata for Normal-
       izationCorrections.txt.

       rfc3453_A_1.txt	   Contains the list of unassigned codepoints in Unicode version 3.2.0....

       rfc3454_B_1.txt	   Contains the list of code points that are commonly mapped to nothing....

       rfc3454_B_2.txt	   Contains the list of mappings for casefolding of  code points when Normalization form NFKC is specified....

       rfc3454_C_X.txt	   Contains the list of code points that are prohibited for IDNA.

       NormalizationCorrections.txt
			   Contains the list of code points whose normalization has changed since Unicode Version 3.2.0.

VERSION

       50.1.2

COPYRIGHT

       Copyright (C) 2000-2002 IBM, Inc. and others.

SEE ALSO

       pkgdata(8)

ICU MANPAGE
							   18 March 2003						       gensprep(8)