Programming :: Cannot Understand Invalid Read Error

Aug 25, 2010

I have just started using Valgrind,which really is great. Most of the reported errors look kinda weird, though I can't really understand what's going on here, for example:

==00:00:02:52.033 7754== Invalid read of size 4
==00:00:02:52.033 7754== at 0x80B0987: MyCls::MyPrintf(long, char*, ...) (MyCls.cpp:270) ...
==00:00:02:52.033 7754== Address 0x47a5ee8 is 0 bytes after a block of size 296 alloc'd ...
==00:00:02:52.033 7754== by 0x809A6C1: ClsMain::taskRun(int, char**) (ClsMain.cpp:177)
==00:00:02:52.033 7754== by 0x816CFE8: main (main-C.cpp:2060)

==7754== ---- Attach to debugger ? --- [Return/N/n/Y/y/C/c] ---- Y
==00:00:02:57.410 7754== starting debugger with cmd: /usr/bin/gdb -nw /proc/7765/fd/1014 7765
GNU gdb Red Hat Linux (6.5-25.el5rh)
Copyright (C) 2006 Free Software Foundation, Inc.

GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as
"i386-redhat-linux-gnu"...Using host libthread_db library "/lib/libthread_db.so.1".

Attaching to program: /proc/7765/fd/1014, process 7765
MyCls::MyPrintf (this=0x47a5dc0, iPrm=3,
sMsg=0x6974320 "blablabla"...) at MyCls.cpp:270
270 cout<<endl<<"m_FilePtr="<<hex<<m_FilePtr<<dec<<endl;

Basically, Valgrind reported the "Invalid Read" error at line 270 of file MyCls.cpp, which is simply a cout of the m_FilePtr variable, which is a member variable of the MyCls class. It's a FILE* variable I use to write repeatedly on a text file. The address reported (0x47a5ee8) is 296 bytes after the "this" pointer (0x47a5dc0),as Valgrind correctly tells me but I honestly don't understand that. And of course, I need to read that variable, not only for the cout (indeed,the error is reported at every reading attempt). Besides, the application doesn't crash, but still I would like to understand if I really have to worry about this "error".

View 10 Replies


ADVERTISEMENT

Ubuntu :: Understand Hard Disk Diagnosis Result / "read Error " While Booting?

Apr 3, 2011

I face "read error " while booting. sometimes it start normally. someone told me to check hard disk for errors. i used gsmartcontrol for this. but from its result i am unable to decide is this hard disk failure or just minor errors. can somebody tell me do i require to change my hd or it just something else to cause such error.

View 5 Replies View Related

Hardware :: Error Mounting - Failed To Read Last Sector (3907027119): Invalid Argument

Sep 7, 2010

I'm trying to mount my new Western Digital Elements 2tb hard drive, but every time I try to plug it into the computer I get this error message:

Quote:

Error mounting: mount exited with exit code 12: Failed to read last sector (3907027119): Invalid argument

HINTS: Either the volume is a RAID/LDM but it wasn't setup yet, or it was not setup correctly (e.g. by not using mdadm --build ...), or a wrong device is tried to be mounted, or the partition table is corrupt (partition is smaller than NTFS),

[code].....

But when I tried opening the hard drive from nautilus I still got the same error message as above (no other volumes was connected at the time). I've also tried opening and watching it in GParted, and I can see it there as a volume that's not allocated. When I tried to allocate the hard it I got the message that it had no partition table. And that I cold make one. I tried and Ubuntu suggested to make a MS-DOS partition table for it. But there I got a little scared as I've not done this before. The external hard drive is brand new and was brought today. And I don't have the possibility to test it with Windows or Mac as I'm using Linux only on my machines.

View 6 Replies View Related

General :: Machine Check Exception - How To Read And Understand It

May 20, 2011

My computer acts strange - sometimes reboots spontanousely, sometimes does not want to boot. When I isse command "mcelog", I receive such info:

[Code]..

How can I read and understand it? Could somebody point me to some documentation?

View 1 Replies View Related

Programming :: KSH - Script Error - Invalid Command ?

Aug 3, 2010

Essentially my ksh script calls a program and passes some commands. It's entering the program just fine, but when it passes the commands it gets "invalid command" error, and loops for a bit.

When I run all the steps manually the program works fine. I turned debug on and see that it enters the program, cmbview, but for whatever reason, it fails on any command that it tries to parse.

Tried running it in a ksh shell, same error. Tried running it as bash shell, same error.

The cmbview exe works and the following commands work, so I can only assume its something with the script parsing the commands.

View 2 Replies View Related

Programming :: Library Linking - ELF File OS ABI Invalid Error

May 6, 2010

[root@shankar-lx src1]# make
gcc -c main.c
gcc -c database.c
gcc -c e_sqlite.c
gcc -o TEST main.o database.o e_sqlite.o /usr/local/lib/libsqlite3.so.0.8.6 -w -lpthread
[root@shankar-lx src1]# ./TEST
./TEST: error while loading shared libraries: /usr/lib/libsqlite3.so.0: ELF file OS ABI invalid

My application compiled well but when try to run, it is giving ELF file OS ABI invalid ERROR. What is this error.
Kernel version is 2.4-18

View 1 Replies View Related

Programming :: Error : Glibc Detected Invalid Pointer

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].....

View 4 Replies View Related

Programming :: Invalid Next Size (fast ) Error : Cant Figure Out?

Apr 24, 2011

So I've been writing a code and I have been adding functions to make life easy, but all of a sudden when i added the last function I got this error *** glibc detected *** /home/ahzeeper/Desktop/C-code/check6: free(): invalid next size (fast): 0x0804c048 ***followed by a huge backtraceNow here is my code

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

[code]...

View 3 Replies View Related

Debian Programming :: Python-TK Alloc - Invalid Block Error

Sep 23, 2015

Just installed Debian 8 last night and trying to run one a few of my scripts that use easygui (a front-end for python-tk basically) and I keep getting alloc: invalid block any time a file or folder selection dialog is presented. I'm able to select a file/folder with no issues, but once the dialog closes I get a variation of what appears to be a memory error followed by alloc: invalid block.

Here's one of my scripts that does it. This one pops up a file selection dialog pretty early on to ask for a file to check, and as soon as I select any file the dialog closes and that error appears in the terminal. It happens whether I run it with Python 2 or Python 3. You will need to install python3-easygui for this script to run properly if you want to check for yourself what happens. This is a first time encountering this error for me.

View 1 Replies View Related

Programming :: Insmod: Error Inserting 'kernel.ko': -1 Invalid Parameters?

Jan 16, 2010

insmod: error inserting 'kernel.ko': -1 Invalid parametersI am getting this error when i am try to insert kernel.ko into kernelMy systemfedora 12 with gcc 4.4.2insmod kernel.koinsmod: error inserting 'kernel.ko': -1 Invalid parametersmy program

__________________kernel.c________________________ ___________

#include <linux/module.h> /* Needed by all modules */
#include <linux/kernel.h> /* Needed for KERN_INFO */

[code].....

View 4 Replies View Related

Programming :: Getting Error 'couldn't Compile Regular Expression Pattern: Invalid Character Range'

Nov 19, 2008

I'm having a bit of trouble with a regular expression I'm trying to write and I'm not sure if it's something Tcl specific or my lack of regexp understanding.

[Code]...

I get a number of strings passed to a proc in the format 3|x where x is a number, either 0 or within the range 5-12. My understanding is that that regexp will match the literal '3' followed by a '|', the escapes the special meaning of |, and then 0 or, because of |, a number within the range 5-12. However I'm getting the error 'couldn't compile regular expression pattern: invalid character range'.

View 3 Replies View Related

Programming :: Realloc(): Invalid Next Size / Getting Error With Reallocate Memory In MakeDSt Function For DSt->SArray?

Jul 19, 2011

I wrote a test program for learning usage of realloc() and I thin I did everything right but I get this error exactly with my 4th time that while tries to reallocate memory in MakeDSt function for DSt->SArray:

Quote:

realloc(): invalid next size

this is my complete code :

Code:
#include <stdio.h>
#include <stdlib.h>
typedef struct DRA
{
code....

View 2 Replies View Related

Programming :: Programmers And People That Understand The OS?

Apr 24, 2011

Well I get my other 2 questions answered , I have one last question that has been buggy me.Anyone know why windows use so many files just to keep the OS going and so bloated? The under line of files of windows is messy and loads self every where and very bloated with windows and windows vista and windows 7 very much so.I'm not sure if Linux /Mac OS X is like this or not .

I know windows needs to support alot more software and hardwar but is that not where drivers come in for the hardware.And programmers need to write the software for windows or Linux / Mac OS X.

View 14 Replies View Related

Programming :: Can't Understand Return Value Of Gawk?

Mar 10, 2010

I write a little script by bash.

#!/bin/bash
a=`gawk '/Iterations /{print $0}' hoge.log | gawk 'BEGIN{FS=" "}{print ($4)}'`
a=`expr 3 '*' $a`

[code]...

View 13 Replies View Related

Programming :: Trying To Understand This Function In JavaScript

Dec 9, 2010

In my book, this is an example of a recursive algorithm:

var reverseArray = function(x,indx,str) {
return indx == 0 ? str : reverseArray(x,--indx,(str+= " " + x[indx])) ;; }
var arr = new Array('apple','orange','peach','lime');
var str = reverseArray(arr,arr.length,"");
alert(str) ;

I'm trying to understand it, I'm stuck at the (str+= " " + x[indx])) part - that part of the function definition expects an ARGUMENT, am I right? What's being passed to it is a bit of PROGRAM, the str+= stuff. So - how is it working?

View 7 Replies View Related

Server :: Can't Understand Logwatch Error

May 23, 2011

This problem is occurring on Red Hat EL 5 WS. However, I have two CentOS 5 systems, with similar configuration to RH EL 5, where this problem does not occur.

I am getting this error:

Can't exec "sendmail": No such file or directory at ./0logwatch line 1018, <TESTFILE> line 1.
Can't execute sendmail -t: No such file or directory

View 3 Replies View Related

Programming :: Unable To Understand The Highlighted Code/syntax?

Mar 4, 2011

I am unable to understand the highlighted code/syntax here and what do variable names starting with an underscore represent?

Code:
#include <iostream>
template <class Class, typename ReturnType, typename Parameter>

[code]....

View 14 Replies View Related

Programming :: Can't Understand The Value Returned By Semctl Using GETPID Option

Oct 18, 2010

I have got a program using semctl(). I cant understand the value returned by semctl using GETPID option and its difference with the actual pid obtined by getpid()as in the following code:

Code:

int semid,retval;
semid=semget(0*20,1,0666 | IPC_CREAT);
retval = semctl(semid,0,GETPID,0);

[code]....

View 4 Replies View Related

Programming :: Yacc Conflicts - How To Understand Grammar Conflict

Jun 4, 2010

I am getting shift/reduce and reduce/reduce conflict in my yacc grammar code. yacc generates (i.e yacc -d -v parser.y) its grammar and state information in the parser.output file.

How can i interpret the below information and understand which grammar state is conflicting with other grammar state? Please help me to understand.

State 159 conflicts: 1 shift/reduce
State 1863 conflicts: 1 shift/reduce
State 1865 conflicts: 1 shift/reduce
State 1960 conflicts: 1 shift/reduce

View 6 Replies View Related

Programming :: Fortran Runtime Error: Bad Value During Floating Point Read

Jun 28, 2011

I am getting error Fortran runtime error: Bad value during floating point read. How do I format negative sign?

[code]...

View 1 Replies View Related

General :: Read Swap Header Failed Invalid Argument (F12)

Aug 25, 2010

When I boot, after startup and before I log on, an error icon appears. I click - it shows a summary of the material that normally rolls by on a unix startup. One item is checked. It says:

Code:
Enabling /etc/fstab swaps: swapon: /dev/mapping/vg_knox-lv_swap:
read swap header failed: invalid argument
I have 1 disk - it has 2 partitions - one an 83 type with a file system in it, holds the kernel, mounts at /boot.

The second partition is an 8e type contains a volume group logically split between lv_root and lv_swap and physically located on sda2. As I understand it, the system is having trouble processing the commands for lv_swap. I am tempted to mess with these commands, but don't have enough know how to do so and am short on the time required to learn enough to master this subject.

View 5 Replies View Related

General :: Simple Boot Flag Value 0x5 Read From CMOS RAM Invalid

Apr 3, 2010

Searching syslog to diagnose other problems I encountered this line. As near as I can tell it has nothing to do with any problem I have.

View 2 Replies View Related

Ubuntu Installation :: Grub And 9.04 - Error "invalid Command" Or "invalid Execution Format"

Aug 16, 2011

Bottom Line: Dvd Drive died in my toshiba laptop and it was replaced (not before tech for some reason reformatted the Win7 partition... which was 100% un-needed, but thats beside the point now. I redid win7 (the tech installed vista) and am TRYING to "redo grub". Facts: The Slackware AND Ubuntu Partitions ARE STILL THERE and when i use SuperGrub Boot CD (which doesn't restore my grub by itself) to boot into slackware, i can see ALL THE CONTENT of both Linuxes still there including grub on ubuntu partition

(Tri-Boot: Ubuntu, Slackware, and WIn7) I had it working for two years or so, SO i know this "setup" works fine. I am A) Trying to do this as simply as possible. B) Trying to avoid the need to download a 800MB ISO (as seen for this issue on this forum) and trying not to have to reformat Ubuntu Partition (though I have the .Debs I have downloaded for it backed up ... all 1.7GB of them) I have /dev/sda1 as win7, /dev/sda2 as Slack and /dev/sda3 as Ubuntu (which contains Grub Legacy).. Every command I do seems to result in an error like "invalid command" or "invalid Execution format " (i think that second one is right) type errors. I compiled (awhile back) a few kernels for Slackware, but feel goofy that I cant figure what i this out (what i thought was going to be a "2 minute" fix)

View 4 Replies View Related

Programming :: Perl Switch Statement Throwing Error Like Bad Case Statement (invalid Case Value)?

Oct 6, 2010

I've written a simple perl code to learn switches in perl.My code is pasted below,

#!/usr/bin/perl
$opt = 1;
switch($opt) {

[code]...

View 3 Replies View Related

Programming :: Invalid Conversion From Bool?

Jul 18, 2011

Dear Advanced c/g++ on boost programers: I have copied and testd a simple (Copy a file with Boost) program from page 372, Example10-10, book(C++ cookbook)

[Code]...

View 3 Replies View Related

Programming :: Timer In Socket Programming - Wait For X Sec After Read() And Then Disconnect The Client Connection

Mar 8, 2011

I have a server listening on incoming client connections. Once the client establishes SSL connection with the server, the server waits on read() from the client. Only Client can disconnect the connection. I want to have a timer in the server program to wait for x secs after read() and then disconnect the Client connection.

View 3 Replies View Related

Programming :: Code Omitted And Invalid Command

Apr 22, 2011

I am getting following error during execution of the example program

[root@localhost NSExamples]# ns example1b.tcl
ns:
[code omitted because of length]
: invalid command name "4"
while executing
"4 "
[root@localhost NSExamples]#

i ran the same program successfully but after placing a protocol i couldnt run this

View 2 Replies View Related

Programming :: Invalid Conversion From �char� To �packet_t�?

May 24, 2010

I am writing a code to restore original packet type from encapsulated packet type. However the following error occurred. Below is an extract of my code. Would appreciate if someone could help me explain why the error occurred and how to resolve this.

packet.h
struct hdr_cmn {
packet_t ptype_; // packet type

[code]....

View 4 Replies View Related

Red Hat :: Error Inserting MD5 - Invalid Argument

Mar 24, 2011

I am running Red Hat with 2.6.18-194.8.1.el5PAE kernel version. I am trying to run encryptfs to encrypt a partition on my hard drive. One of the kernel modules necessary is the md5.ko. I noticed it wasn't loaded in when doing an lsmod. I tried running modprobe md5 and it fails to load:

[root@ ~]# /sbin/modprobe -v md5
insmod /lib/modules/2.6.18-194.8.1.el5PAE/kernel/crypto/md5.ko
FATAL: Error inserting md5 (/lib/modules/2.6.18-194.8.1.el5PAE/kernel/crypto/md5.ko): Invalid argument

I ran dmesg and grepped for md5, but I didn't see anything in there.

View 1 Replies View Related

Fedora :: Error 12: Invalid Device Requested - Win 7 + F11

Dec 4, 2009

I have installed Windows 7 followed by Fedora 11. Everytime I install Fedora 11 with Win 7, the first to boot, I get BOOTMGR missing. Later I used "df -h" command to see the disk file usage fdisk -l" to see the info regarding Disk Partitions. Went into the /boot/grub/menu.lst and modified the order. I set the partition where I find the bootmgr.exe.mui, there was another file named "memtest.exe.mui in the same file.

I navigated to the above said through Fedora 11. Located inside the Win 7 installed directory /boot/en-US/

When I changed the menu.lst file, I get a new error Error 12: Invalid device requested when I tried to boot Win 7. Does that mean that Fedora 11 GRUB is not getting the bootmgr.exe.mui since its 2 levels inside the boot directory ??

View 2 Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved