I’m trying a new assignment I’ve got: I need to copy the Environment variables from the shell into an array, then lowercase them and print them back. (I’m using Ubuntu 20.04.4 LTS, gcc for compiling, and writing my code in C language). I was advised to use malloc to create the array but deci…
Tag: valgrind
Which Valgrind tool and option to use for investigation of RAM allocation for each function?
I have never used Valgrind, but I think this tool can help me with my question. I would be grateful for any help. In my R code, I use the MixedModels Julia package. I integrate Julia in R using the JuliaCall package. I work with very large datasets (~1 GB, ~4×10^6 observations) and at the modeling step (…
How to fix occasional EINVAL error when calling pthread_create
The Problem When I create a detached thread using the code below, pthread_create will sometimes return EINVAL. I would like to know why this is happening and what I should do to fix it. When the error occurs, the code below will print the following line: Error creating thread. errno = 22: Invalid argument Wha…
valgrind Address 0x421688c is 0 bytes after a block of size 4 alloc’d for linked list having integer data
Although there were multiple threads related to valgrind Address 0x421688c is 0 bytes after a block of size 4 alloc’d kind of questions, but all were expressed with either strlen, or ” related issues and I understand them. I am having with linked list insertion dealing with integers. I did inserti…
Client/Server pthreads program not executing under Valgrind. Runs fine normally
I have a C server program that creates & opens the write end of a named pipe (in /var/run), and interrupts on a SIGIO signal for a tty uart, pushing data into the pipe from that interface. This program also spawns a secondary pthread, which opens the read end of a separate pipe (again, in /var/run), reads…
Valgrind does not work with WSL?
When I installed WSL for my computer I was very excited to have a more natively supported Linux system rather than using VirtualBox. However I get this error when I try to run it. Is there a reason why? I am happy to give more information as required. Answer It’s definitely possible I’ve encounter…
valgrind: mmap(0x600000, 8192) failed in UME with error 12 (Cannot allocate memory)
I was following this exercise. This page has instructions to install Valgrind 3.6.1 but this version of Valgrind is not supported by my current Linux kernel version. So, I installed Valgrind 3.11.0 and followed the instructions there after and on running this command: got this error: How to do I fix it? IR…
What exactly does Valgrind take in to account when giving the number of allocations? [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations. Closed 7 years ago. Improve this ques…
valgrind on raspberry Pi 2 invalid read by libtasn1
I’m currently trying to find a memory leak with valgrind on my Raspberry pi 2 Model b. My project is using the following compiler flags For debugging purposes i have removed all the code in my main function so it looks like: System uname -a: Linux debuggingpi 4.1.7-v7+ #817 SMP PREEMPT Sat Sep 19 15:32:…
Waiting for system call to finish
I’ve been tasked to create a program that takes a text file that contains a list of programs as input. It then needs to run valgrind on the programs (one at a time) until valgrind ends or until the program hits a max allotted time. I have the program doing everything I need it to do EXCEPT it isn’…