Programming :: C - Malloc Causing Segfault?

Mar 20, 2010

#include <stdio.h>
#include <stdlib.h>


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Programming :: C - Segfault During Malloc. How To Use The Pointers

Mar 23, 2010

So the place where I'm having a problem is here:

typedef struct {
void **Mem_Chunk;


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CentOS 5 :: Mod-php Causing Apache To Segfault?

Sep 22, 2010

I have a newly installed centos 5.5 x86_64 running as a guest on a xen environment. I've installed httpd, mysql, php, mod-php, cacti and some how mod-php i causing apache to exit with segmentation fault. I don't understand whats causing the problem, I have similar boxes with the same setup that works.

[Wed Sep 22 09:19:47 2010] [notice] Apache/2.2.3 (CentOS) configured -- resuming normal operations
[Wed Sep 22 09:20:11 2010] [notice] child pid 3040 exit signal Segmentation fault (11)

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Fedora :: Track Down What "at" Is Attempting To Run That Is Causing The Segfault

Sep 16, 2010

kernel: at[18314]: segfault at bf963e1f ip 00227518 sp bf958554 error 6 in[221000+c000]

How can I track down what "at" is attempting to run that is causing the segfault?

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Programming :: C - How To Malloc For A Structure

Mar 7, 2010

How do you malloc a struct in C? I have a structure of the form:

typedef struct child_req_to_parent


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Programming :: C - Malloc For A Void Pointer?

Mar 20, 2010

So far I have this:

int mm_init (mm_t *MM, int hm, int sz) {
int i;


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Programming :: Why Malloc() Blocks/sleeps

Jun 2, 2010

I have encountered this scenario wherein malloc does not return.

char * tmp;
rs = 100 to 40000 bytes


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Programming :: Malloc Fails To Allocate Memory

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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Programming :: Hooking Calls To New/malloc Delete/free?

Jan 11, 2010

Is there a way to hook calls to new/malloc, delete/free in C++? I tried the following methods: LD_PRELOAD -> fails for malloc, because dlsym seems to depend on malloc -Wl,--wrap,malloc -> doesn't work for 'new' gcc hooks -> doesn't work always, e.g. for uclibc there are no hooks Are there any other methods I could try?

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Programming :: Segfault In Program Using Pthreads

Mar 16, 2010

I am trying to write a peer to peer application in C++ using pthreads library. There are few types of nodes that run in the program. The 'beacon' nodes form the core of the network. The ordinary nodes 'join' the network by sending join requests to the beacon node. So, my program runs till the join requests and responses are received. When I try to 'connect' using connect function from the socket library, I get a segfault. I am not sure if the segfault occurs for the connect function, because sometimes the program just runs to completion. It could be an issue related to threads or memory allocation.

When I run gdb, it shows me the following:
(gdb) run b2-n00.ini
Starting program: sv_node b2-n00.ini
servant:12600> [New LWP 1]
[New LWP 2]
[New LWP 3]
[New LWP 4]
[New LWP 5]
[New LWP 6]
Before Exiting[LWP 1 exited]
procfs: fetch_registers, get_gregs line 3768, /proc/23952/lwp/1: No such file or directory.

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Programming :: Fortran - Array-valued Function Leads To Segfault?

Jun 8, 2010

I'm trying to implement a solver for a system of differential equations in Fortran. The solver contains a number of functions which are supposed take real values, 1D arrays of real values or both as arguments and return arrays of real numbers, all of which cause the program to segfault. Example:


function y_exakt(t)
implicit none
real::t, pi


(the last number in the array seems to change randomly). Then the program crashes either when f(t,y) is called or when dy is returned (after removing the call to f). What could cause these (memory?) problems and/or what could I do to identify the problem? Increasing the maximum stack size with ulimit or compiling the program with -fno-automatic has had no effect. I'm using gfortran (gcc 4.4.3) on a 64-bit Ubuntu Lucid machine. The complete program can be found at [URL].

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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$' and alphabets = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ$'


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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Programming :: Vsprintf Causing Segmentation Fault?

Jan 8, 2011

I'm working on some code which suddenly is causing a segmentation on vsprintf. This was working before, so I cut and pasted some code from vsprintf function at the cplusplus site and even this is causing a problem. Anyway the example is


void PrintFError (const char * format, ...)
char buffer[256];
va_list args;


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General :: In Linux Malloc() Initializes To Zero?

Nov 10, 2010

int main()


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Fedora :: Checking For GNU Libc Compatible Malloc... No \ Fix It?

Jul 13, 2010

I'm trying to compile ink but with no luck. Here are the terminal output,

[trumpet@Trumpet-PC ink-0.5.1]$ ./configure
checking for a BSD-compatible install... /usr/bin/install -c


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OpenSUSE :: Getting A Weird Compilation Error With Malloc.h?

Aug 3, 2010

I am getting a weird compilation error with malloc.h/usr/include/malloc.h:86: error: expected ')' before '__size'This is what the code looks like inside malloc.hextern void *(*__morecore) __MALLOC_PMT ((ptrdiff_t __size))When I did some googling, it was stating that ptrdiff_t was not defined; but, it is.#define __malloc_ptrdiff_t ptrdiff_t

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Server :: Malloc-64 Memory Leak/trashing?

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...

Active / Total Objects (% used) : 9118075 / 9153600 (99.6%)
Active / Total Slabs (% used) : 152157 / 152157 (100.0%)


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Ubuntu Installation :: Checking For GNU Libc Compatible Malloc?

Feb 25, 2010

I have been trying to fix this problem for 3 days, any ideas before I jump through the window (not the bill gates one)?I am using ubuntu 9.10 and running a ./configure.

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Server :: User-specified Malloc Function Returned NULL?

Dec 23, 2010

Our Fedora-ds was down for some reason,And I got these logs:

[23/Dec/2010:18:59:32 +0200] - libdb: User-specified malloc function returned NULL
[23/Dec/2010:18:59:32 +0200] - id2entry error 12
[23/Dec/2010:18:59:32 +0200] - id2entry get error 12


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Software :: Glib Detected Malloc Memory Corruption?

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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General :: Clearing Of Memory Allocated By Using Malloc/kmalloc/vmalloc

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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General :: Where Does The Kmalloc/Vmalloc/get_free_pages/malloc Allocates Memory

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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OpenSUSE :: Automount: Segfault At ... In

Feb 4, 2010

automount[9052]: segfault at 60 ip 00007f75c15bcd7c sp 00007f75c0753c30 error 4 in[7f75c15b6000+1b000]/etc/hosts... zbv6 zbv6.gud.s.atcd /net/zbv6/home

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Ubuntu Multimedia :: PSX Crashes With A Segfault?

Feb 19, 2010

When attempting to run pSX on Ubuntu 9.04 (and the 9.10 livecd), it crashes with a segfault. I -have- read [URL] and tried shutting down pulseaudio as recommended there. However:

$ sudo /etc/init.d/pulseaudio stop
* PulseAudio configured for per-user sessions
$ sudo killall pulseaudio


How do I get pSX working? I tried copying the psx.ini file from another machine because the thread says pSX works fine after you change the sound device used, but it still segfaults when I try running it.

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Ubuntu :: Compiz SegFault Randomly In 11.04?

May 6, 2011

I am on a fresh install of Narwal. I've switched to classic because unity wasn't mature enough IMO. Just installed ccsm and now my display will crash randomly after running for a short while.

daniel@orange:~$ compiz --replace --debug
compiz (core) - Debug: Could not stat() file /home/daniel/.compiz-1/plugins/ :


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Software :: How To Debug Ns-2 Code For Segfault

Jun 14, 2010

$ cat segfault.c
int main(void)
char *s = "hello world";
*s = 'H';


So, now we know where exactly the problem occures. I know only these three commands to debug using gdb. But in case of ns-2 code, I don't know how to use gdb.

I changed a routing protocol's C++ code in ns-2 and successfully recompiled ns-2 but when I run any tcl script with that particular protocol, I get 'segmentation fault'. Now I want to trace what part of the code is causing this. I have tried using 'printf's at suspectable places. Is this possible to debug ns-2 code with gdb just like the segfault.c above? I am useing fedora 9.

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Slackware :: Gs Segfault When Joining Pdf Files?

Dec 28, 2010

I usually use the following command to join several PDF files in one :gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=output.pdf input1.pdf input2.pdfHadn't have to do it for a while but today, I needed it and thus fired my script.lam! gs segfaults.A quick internet search and I found this : Arch related, while I'm running slackware64-current, the behaviour was exactly the same as mine.In the above thread, one guy linked to a bug report which seems to be theculprit : 4.5.1, gs 9.00, x86_64, indeed, slackware64 seems to be exactly in that situation.

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Slackware :: Execute Skype Getting Segfault

Apr 28, 2010

Has anyone had any luck getting a slackbuild to work with the newest version of skype I tried with the static binary but when I go to execute skype I get a segfault. I also tried with a different slackbuild and it doesn't work either.

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Slackware :: Upgrade To 13.1 Causes Segfault In Program That Ran Under 13.0

Mar 10, 2011

I have a custom program that has been running on Slackware since about 2004. It was running fine on Slackware 13.0, but an upgrade (following the procedure in UPGRADE.TXT) to 13.1 causes the program to segfault on a read/write op to the serial port (details here).

what might have changed between 13.0 and 13.1 that might affect serial port programming? I've been through CHANGES_AND_HINTS but nothing is jumping out at me.

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Slackware :: XDM Segfault After Upgrading To RC1 1337

Mar 10, 2011

I encountered "xdm segfault" error due to libXt upgrade. startx worked, but xdm failed. Should be same bug as this link: [URL]

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