Programming :: Memory Leaks - Glibc Detected - ./SuffixTree: Malloc() - Memory Corruption - 0x00
Mar 21, 2011
I am new to C and linux. My code below does arbitary writes but I cant figure out where or how it does it.
I am calling the insertNode() function with seq = 'MISSISSPPI$' and alphabets = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ$'
Code:
Weird behaviour I should mention is that when I check for NULL pointer in node->child[index], the unassigned values are not null anymore, they point to arbitary memory.
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Jul 21, 2011
When I am trying to run my application on RHEL 6 (Kernel 2.6*), I am getting the following error.*** glib detected *** ./corenms:malloc(); memory corruption : 0x086691d0 ***
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Aug 22, 2010
This is my first post in these forums. I'm still quite new to Linux (using Mint 9) so please bear with my not-very-articulate question(s)When I boot up and open up a tty terminal I get a message saying "Memory corruption detected in low memory." I've done an extensive google search about the issue and it seems not uncommon. I ran a memtest with no errors returned, so I'm sure that there's nothing really wrong with the memory; apparently it's a bug in the kernel that's causing this.
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Dec 28, 2010
Created application is working too slow, looks like there are a lot of memory leaks, there are a lot of pointers. Any effective tool for run-time errors and memory leaks detection in Visual Studio C++?
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May 7, 2011
I am developing a code where I need to store the planes of an object in a tree & also i need to store it in a list for further processing ... when I try to allocate using malloc the memory allocation when i checked this in internet , I came to know that it may because the memory that I am trying to allocate may be more than the size_t variable.
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Aug 28, 2009
language: C
OS: linux
I wrote a multithread program(approx 1000 thread have to run) and each thread has to parse a file(for each thread there is one file, ex:thread1 has to parse file1 and thread2 has to parse file2 like this....). I wrote "parse" program as follows. It is working well, if i create 50 threads. but if i run more than 200 thraeds Im getting doublefree corruption as follows:
Code:
*** glibc detected *** ./simulator: double free or corruption (fasttop): 0xb70007b0 ***
And some time I am getting parsing problem and error af follows:
Code:
powersetting.6607:1: parser error : Start tag expected, '<' not found (where powersetting.6607 is file name, when i check this file it is started with '<').
parse program as follows:
Code:
void parse_first(char* filename, int portnum, struct Poweroff *Powerptr1)
{
struct Poweroff *Powerptr;
Powerptr = Powerptr1;
[code]....
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Feb 14, 2011
I just don't know how centos is using the memory but... I took a look at httpd conf, may be I've missed something when I type "free mem" in ssh the memory is increasing while I'm playing one video, flv and mp4 on my site. it is increasing each time I play a different videos either the same.
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Mar 2, 2011
I'm afraid I have a huge issue with my newest Fedora 14 server. I recently migrated to Fedora 14 from Centos 5, which was very stable, but had ancient packages and libraries and my users were revolting...The machine is a HP ProLiant 360 G7, with 12G RAM and 6 SAS drives in RAID 5.After I migrated to Fedora 14, I noticed that for some reason, during the course of about 24 hours, all usable RAM "disappears" and applications are forced down to swap space. Needless to say I didn't have this issue on CentOS.
The server does heavy IO as per it's function (it's a heavily loaded file processing server and user simulation computing station among other things, which causes lots of random IO), so I thought it may be the cache, but then I realized it cannot be - because obviously Linux will use onyl "unused" RAM for caching and frees it up as soon as an app need it. Then, I thought to check the "slabtop" to see what's going on in Kernel memory. Unfortunately I don't have the screenshot from the time just before the latest crash, but there's a certain value displayed by slabtop, which slowly, byte-from-byte creeps over all available RAM, eventually forcing applications down to the swap. This is malloc-64, and as you can see from the bellow copy-paste, it's building up again even now...
Code:
Active / Total Objects (% used) : 9118075 / 9153600 (99.6%)
Active / Total Slabs (% used) : 152157 / 152157 (100.0%)
[code]...
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Aug 8, 2011
Let's analyse this While registering a Char deriver to kernel think that we had allocated memory using any of malloc/kmalloc/vmalloc.
If we forgot to Free that allocated memory while unregistering, will that memory be allocated aside or kernel clears it...?
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Jul 27, 2011
clarrify the below points:1) Where does the Kmalloc/Vmalloc/get_free_pages/malloc Allocates memory in which space is it Kernel/User?2) Coming to Hardware Point of View is where Kernel/User Space Memory Allocates is it in RAM or any.?3) In Device Drivers, how Open Call get to know whether the hardware is connected/not?
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Apr 13, 2010
How do I write a script for my Linux that can show me total memory vs used memory and have it email me results if it's over 70 percent?
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Aug 25, 2010
Is that possible that SHM shared memory is counted as cache memory on Linux with kernel 2.6.18?If find it really odd since this memory is not file backed, but I have a piece of code that loads data using shm_open+mmap, and it generates an amount of cache memory in /proc/meminfo that corresponds exactly to the amount of shared memory (I load that data from a file but I am using posix_fadvise(fd,0,0,POSIX_FADV_DONTNEED) to ensure this file is not cached and I made sure that it is working as expected). As far as I know SHM memory was not tagged as cache memory with kernel 2.6.9.If it is the case it is really unfortunate since normally cache memory can be considered to be part of the "available" memory since it can be flushed promptly but this is clearly not the case with SHM memory... Is there an easy way to get the total amount of used SHM memory on a system?
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Oct 14, 2010
Kindly let me know the Linux tool to find out the memory corruption in a program. The tool could be built for PPC as well.
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Jan 4, 2010
I updated several packages on one of my servers on Dec 21st and have been seeing excessive swapfile usage since then. The problem process seems to be httpd which in our environment runs a subversion server as well as serving a number of php pages over https. At present I am having to bounce apache approximately every 5 days as it has used all 8GB swap in that time.
[Code]..
Of the updates listed as installed, the only one that looks likely to affect apache is glibc. Looking at the stats from sar -r I can see swap usage increasing by approx 3% (of 8GB) every hour.
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Feb 1, 2010
I have a desktop PC which initially had the Intel D946gzis mobo, its chipset as video controller, some RAM and so. There I installed Debian without a problem alongside WindowsXP.
I've bought an ASUS HD 4670 video card, installed it on the PC and now the installed Debian does not work, while the Ubuntu live CD refuses to run no matter if I set acpi, apic on or off... it throws me some low memory corruption at position just like shown here. With normal configuration, Debian throws kernel panic (keyboard lights blinking). Anyone have faced this before? Ideas? Thanks!! (meanwhile, debian hides in a virtualbox :'( )
Edited: Tried Ubuntu 9.10 x64 (due to the fact i've a core2duo at 2GHz) and it throws a kernel-panic to me (flashing caps and num LEDs). On screen, can be read different lines with things like:
[ 1.957161] [] rb_erase+0xd6/0x160
[ 1.957266] [] page_fault+0x25/0x30
Could it be something about this new video card having ddr3?
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Oct 3, 2010
I've just installed ubuntu 10.04 on a Lenovo Thinkpad Edge. Problem is that it generally doesn't detect the USB memories that I've been trying to use. On two occasions it did in fact detect the flash memory, but it couldn't open/read it for some reason (USB memories works on other computers), but all the other times the USB flash memory didn't even show up in Nautilus.
I am no techie so I'm not sure how to check what the problem is here. I've been googling it but either it refers to some specific stuff that doesn't cover my case or it simply is too technical for average users like me to understand.
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Jan 15, 2011
I am running Fedora 14 64 bits on a Thinkpad 510:
2.6.35.6-45.fc14.x86_64 #1 SMP Mon Oct 18 23:57:44 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux
I installed 6 GB of ram. My bios is detecting the 6GB but my OS is only using 2.9GB.
cat /proc/meminfo:
MemTotal: 3013448 kB
MemFree: 64704 kB
Buffers: 10516 kB
Cached: 438716 kB
SwapCached: 127460 kB
Active: 2033756 kB
Top:
Mem: 3013448k total, 2951100k used, 62348k free, 11128k buffers
Swap: 5111804k total, 653136k used, 4458668k free, 437464k cached
The kernel is likely not detecting all the memory. Is there a workaround/patch available for this issue?
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Aug 5, 2010
hey dude error in gnu c pointer
I am using Red Hat Enterprise Linux 5.0.
#include <stdio.h>
#include <stdlib.h>
int main()
{
char * cp = NULL;
[Code].....
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Apr 20, 2010
I am using malloc and frees a lot in my program. It shows its allocated but when i remove it doesnt show as the memory is removed(I am using the top command to view VIRT memory usage). If this continously grows what would happen to my program (Will it go out of memory?)
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Feb 7, 2011
Fedora 14 xfce
HP Mini 210
I am looking to buy some memory for my netbook. Currently I have 1 GB of DDR3 memory. However, the specification says that 2 GB of memory is the max. However, when I do the following it says that 4GB is the max:
[Code].....
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Mar 18, 2011
I have a computer with 16GB of ram. At the moment, top shows all the RAM is taken, (NOT by cache), but the RAM used by the various processes is very far from 16GB.I have seen this problem several times, but I don't understand what is happening.My only remedy so far has been to reboot the machine.
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Jan 11, 2010
let me know how to clear cache memory ( RHEL 5.1 ) as it consumes almost 100% physical memory.
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May 3, 2011
I am looking for free database that has low memory usage and innodb and memory like engins that has C API and support trigger and client/server support for using in embedded linux systems.
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Feb 3, 2010
we found that if we use 'top' to show the memory usage of a server (SuSe Linux 10), we can get virtual memory usage as well as 'Resident memory' usage. For virtual mem or a particular process, it is around 1.1GB, which is large but for resident memory, it only consumes 300MB. Are there anyone who knows what the differences are? I would also like to know whether the difference (1.1GB - 300MB) = 800MB are actually available for use by other applications in the system.
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Apr 19, 2010
I get this error when I run "sudo apt-get install python-software-properties"
Preconfiguring packages ...
dpkg: unrecoverable fatal error, aborting:
fork failed: Cannot allocate memory
E: Sub-process /usr/bin/dpkg returned an error code (2)
I'm trying to install deluge via ssh and my vps has 512mb ram and is only using 11% of it prior to running the code.
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Oct 20, 2010
I am monitoring physical memory in a server I administer, and my hardware provider told me they had increased physical memory size to 4Gb... However, using several tools (free -m; top; dmesg | grep Memory; grep MemTotal /proc/meminfo I discovered that I actually have 3Gb, not 4... But, my doubt comes from the fact that dmesg | grem Memory tells me I have 3103396k/4194304k available The first number is effectively 3Gb, but the second one, is 4! so, why I am looking at this two different numbers?
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Jan 29, 2011
I have had a fresh install of Ubuntu 9.10 and installed some software after that.Since third some, some process is eating half of my memory.I have checked processes running in system manager but everything is normal.Maximum is consumed by compiz which is about 26 mb, seems very normal.I did restarted my computer several times, and in the start for 5 mins, its fine after that again my cpu fans runs at very fast speed and my one cpu is used up 95 % (I have dual core).Please help me out, this invisible thing is driving me crazy.I am attaching my htop screen shot (sorted by cpu %), now the cpu is not used by completely but fan is still struggling hard and fast.
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Nov 22, 2009
I am writing an application that wants to access periphals registers outside the standard (allowed) memory area.
Doing so gets me "segmentation fault".
I know, this is natural behaviour.
One way of getting around this is writing the module which has to be loaded by linux. I will consider this some time later.
For now, I want to come to some quick result and allow linux or gcc compiler to write to those memory areas of periphals. Is there a direct way to do so?
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Jan 17, 2010
I found from command 'top' that 8GB memory are used. However, using command 'ps' with some options to grep the running processes and then summing up the memory used by the running processes are less than 2 GB. Where has the used memory gone ?
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Jan 8, 2011
I have been setting up a vps I got out with bhost.net, with CentOS installed. I've been learning and have set up everying I need with the exception of ftp/sftp.
Using yum I installed vsftpd and ran into problems, thinking it was something I might of done I did a fresh install of CentOS and I still recieve the same problem on a fresh install so it is nothing I have done to the server.
The problem is when connecting via a sftp client I get an out of memory error. This error is listed in the putty faq ( url ) under A.7.5, there is a brief explaintion of the cure under A.7.6.
there is mention of a login script but I don't know where this is located. I'm a novice at Linux but by no means incompotent when it comes to computing.
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