when i try to use the class i wrote, i either get this:
*** glibc detected *** double free or corruption: 0x40236ff4 ***
and the proccess exits with an error code of 0;
or it segfaults. could someone look at my header file (with imp.) to give me some insight as to why its not working?
... (19 Replies)
I am using a structure defined as follows
struct gene_square
{
double *x;
double *y;
};I have class, with a member function which is a pointer of this type:
gene_square* m_Genes;I am allocating memory in the constructors like this:
m_Genes = new gene_square;
for (ii=0;... (1 Reply)
Hi,
I am having a hell of a time getting this to work. So basically, I have opened a popen to run a program that is going to prompt an action to occur half way through, when it gets to this I need to create a separate process and do some stuff, then return to the original process. This works... (0 Replies)
Hi All,
I have a simple code which does some computation by matching string patterns.
In brief:
1. The code reads .dat and .txt files.
2. .dat files are huge text files and .txt files contain some important words.
3. I am just doing strstr to find the patterns.
4. The function returns the... (3 Replies)
*** glibc detected *** ./a.out: malloc(): memory corruption (fast):
Posted A minute ago
M trying to make multiway tree and dont know what happend when this part of code get executed:
01void ins(NODE *ptr)
02{
03 //working
04 if(ptr!=NULL)
05 {
06 SNODE *var=NULL;
07 var=(SNODE... (3 Replies)
I am using libxml2 library for XMl parsing and libxml++ is C++ wrapper over that. So I am using API of libxml++. I am creating my class and composing instance xmlpp::Node *pNode in that. my class also have funciton prepareXPathQuery() which creates query string and have other fucntion... (2 Replies)
I am facing a problem of memory corruption. The loop runs for the first time but does not go through the second time. What could be the problem?
for(int z=0;z<2;z++)
{
fp=fopen("poly.dat","r");
/*do something which reads this file into a 2D array*/
fclose(fp);
... (10 Replies)
Currently I test a shared library vendor provided in linux , the following is the simple source :
#include <iostream>
using namespace std;
extern int test1();
extern int test2();
int main()
{
cout << "hello world" << endl ;
return 0 ;
cout << "Test 1" << endl;
... (6 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
I'm doing aproximation of derivative called five-point stencil. For every value of x, in interval , in step... (0 Replies)
Discussion started by: antonija
0 Replies
LEARN ABOUT SUSE
redzone
REDZONE(9) BSD Kernel Developer's Manual REDZONE(9)NAME
RedZone -- buffer corruptions detector
SYNOPSIS
options KDB
options DDB
options DEBUG_REDZONE
DESCRIPTION
RedZone detects buffer underflow and buffer overflow bugs at runtime. Currently RedZone only detects buffer corruptions for memory allocated
with malloc(9). When such corruption is detected two backtraces are printed on the console. The first one shows from where memory was allo-
cated, the second one shows from where memory was freed. By default the system will not panic when buffer corruption is detected. This can
be changed by setting the vm.redzone.panic sysctl(8) variable to 1. The amount of extra memory allocated for RedZone's needs is stored in
the vm.redzone.extra_mem sysctl(8) variable.
EXAMPLE
The example below shows the logs from the detection of a buffer underflow and a buffer overflow.
REDZONE: Buffer underflow detected. 2 bytes corrupted before 0xc8688580 (16 bytes allocated).
Allocation backtrace:
#0 0xc0583e4e at redzone_setup+0x3c
#1 0xc04a23fa at malloc+0x19e
#2 0xcdeb69ca at redzone_modevent+0x60
#3 0xc04a3f3c at module_register_init+0x82
#4 0xc049d96a at linker_file_sysinit+0x8e
#5 0xc049dc7c at linker_load_file+0xed
#6 0xc04a041f at linker_load_module+0xc4
#7 0xc049e883 at kldload+0x116
#8 0xc05d9b3d at syscall+0x325
#9 0xc05c944f at Xint0x80_syscall+0x1f
Free backtrace:
#0 0xc0583f92 at redzone_check+0xd4
#1 0xc04a2422 at free+0x1c
#2 0xcdeb69a6 at redzone_modevent+0x3c
#3 0xc04a438d at module_unload+0x61
#4 0xc049e0b3 at linker_file_unload+0x89
#5 0xc049e979 at kern_kldunload+0x96
#6 0xc049ea00 at kldunloadf+0x2c
#7 0xc05d9b3d at syscall+0x325
#8 0xc05c944f at Xint0x80_syscall+0x1f
REDZONE: Buffer overflow detected. 4 bytes corrupted after 0xc8688590 (16 bytes allocated).
Allocation backtrace:
#0 0xc0583e4e at redzone_setup+0x3c
#1 0xc04a23fa at malloc+0x19e
#2 0xcdeb69ca at redzone_modevent+0x60
#3 0xc04a3f3c at module_register_init+0x82
#4 0xc049d96a at linker_file_sysinit+0x8e
#5 0xc049dc7c at linker_load_file+0xed
#6 0xc04a041f at linker_load_module+0xc4
#7 0xc049e883 at kldload+0x116
#8 0xc05d9b3d at syscall+0x325
#9 0xc05c944f at Xint0x80_syscall+0x1f
Free backtrace:
#0 0xc0584020 at redzone_check+0x162
#1 0xc04a2422 at free+0x1c
#2 0xcdeb69a6 at redzone_modevent+0x3c
#3 0xc04a438d at module_unload+0x61
#4 0xc049e0b3 at linker_file_unload+0x89
#5 0xc049e979 at kern_kldunload+0x96
#6 0xc049ea00 at kldunloadf+0x2c
#7 0xc05d9b3d at syscall+0x325
#8 0xc05c944f at Xint0x80_syscall+0x1f
SEE ALSO sysctl(8), malloc(9), memguard(9)HISTORY
RedZone first appeared in FreeBSD 7.0.
AUTHORS
Pawel Jakub Dawidek <pjd@FreeBSD.org>
BUGS
Currently, RedZone does not cooperate with memguard(9). Allocations from a memory type controlled by memguard(9) are simply skipped, so buf-
fer corruptions will not be detected there.
BSD January 9, 2009 BSD