The kernel of operating systems popularly known as Linux, or sometimes GNU/Linux.

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What setsockopts() 'name' values are used by the running Linux kernel?

I am introducing some new socket commands with nf_register_sockopt(&my_new_socket_options). How can I find, what setsockopt commands are already used (registered?) by the currently running kernel, ...
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635 views

dmesg: pci BAR 7: can't assign io

I have VMware virtual machine running Debian Wheezy. I have compiled my own kernel 3.14. I have noticed dmesg is flooded with messages pci BAR 7: can't assign io (size 0x1000). I have no idea what ...
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1answer
67 views

kernel: nf_conntrack: table full, dropping packet; Underlying Reason

I have a modified linux on an ARM9 processor. It was working OK, but yesterday I got this error repeatedly: kernel: nf_conntrack: table full, dropping packet I have 2 questions: How can I find ...
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12 views

doubts regarding memory control group and memory zones lru list?

I have doubts regarding memory control group and memory zones lru list ? I just want know whether memory control groups lru list is subset of memory zone lru list or they have different pages on them ...
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1answer
32 views

How is the linking mechanism so fast in the kernel system calls? [closed]

If I open any file in Linux kernel almost every file has many extern functions and many #indef or #ifndef macros so while compiling how exactly does it map all the functions and macros when more than ...
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26 views

How to instruct RHEL6.5 Linux to save/starts states before crush or restart

I have multiple Workspaces, each responsible for different revisions of the same software. Not to have to recreate all Worspaces and open all tools/windows, I'm wondering how can I instruct Linux to ...
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31 views

Detecting and categorizing device drivers in a running system

How can I obtain what device drivers are incorporated in a running kernel? More than this, how can I categorize these device drivers? For instance, this is a Linux kernel conceptual map, from ...
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444 views

Can a zImage be used with U-Boot and ArchLinuxARM?

I am using U-Boot on a Cubieboard 2, sun7i AllWinner A20 board to boot into ArchLinux ARM. The kernel version that I have is the sun7i latest, which is 3.4.103-5-ARCH so, in kernel terms, it's a bit ...
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431 views

“Last resort” Linux terminal command to reboot (over ssh) in case of a kernel bug?

I have a small server with Ubuntu 10.04 on it; I am manipulating this server from another computer via ssh, and I tried to use nfs on it to share files. That mostly works, until one of the clients ...
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241 views

module scsi_wait_scan not found on CentOS kernel-ml causes kernel panic on boot

I am attempting to upgrade from kernel-lt to kernel-ml, following the instructions here, however on boot the console is flooded with module "scsi_wait_scan" not found This leads to a general kernel ...
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169 views

What is “fs” short for in kernel function “get_fs()”?

There are two Linux kernel functions: get_ds() and get_fs() According to this article, I know ds is short for data segment. However, I cannot guess what "fs" is short for. Any explanations?
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124 views

Looking for a Distro for a beginner in kernel hacking [closed]

I'm currently trying to learn the basics of the linux kernel via Linux Kernel in a Nutshell and Linux Kernel Development books, the problem is that when using Ubuntu, there are a lot redundant ...
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1answer
302 views

Why is there AF_NETLINK? Is AF_UNIX not enough?

As far as I understand, AF_NETLINK socket protocol is for communicating between the kernel and userspace and AF_UNIX is for communication between two userspace processes. Why does Linux need a ...
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2k views

What does “task mysqld:xxx blocked for more than 120 seconds” mean?

We are troubleshooting a MySQL issue where some queries are taking a very long time complete and I see many of these entry in /var/log/messages: Jan 28 05:52:15 64455-alpha01 kernel: [2529273.616327] ...
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1answer
61 views

Looking for ancient kernel source

I'm looking for an specific old kernel source namely 2.6.26.5 to build an exact replicate of an cross toolchain for an embedded target. Unfortunately all I can find is 2.6.26 in the kernel.org ...
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136 views

CentOS/Kernel v3.18/Thunderbolt2

I just got a new SuperMicro box with a AOC-TBT-DSL5320 Thunderbolt2 card pre-installed. I installed CentOS 6.5,ran yum update, and then, because to my understanding at least, thunderbolt support was ...
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170 views

Can I masquerade a kernel uevent?

What I think happens From my understanding this is what happens when I connect a USB device to my computer: Kernel recognizes that I plugged in a USB device Kernel setups the very low-level things ...
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114 views

MAC to MAC MII interface not working

I have a MAC to MAC MII interface between MPC8569 processor and BCM68610 controller , whose schematic design is followed from here. My linux kernel version is 2.6.32. I want to ping one device from ...
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44 views

haproxy - in CentOS is running but the whole directory is no more available and i do not have configuration backup

I had haproxy configured in /var/tmp directory by compiling, i did not had any backup after few months its still running but my /var/tmp/ is having no haproxy anymore. Can anyone please recover it i ...
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1answer
187 views

Cannot update new kernel for CentOS 7 although the server have space enough

I try to update kernel on my CentOS 7 but the yum say there is no space enough on /boot although /boot have 343 MB as show below: Filesystem Size Used Avail Use% Mounted on /dev/sda2 477M 105M 343M ...
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84 views

Meaning of an ampersand prefix in a device tree

I am looking at a DTS file which tries to specify different nodes, but interestingly I find a few nodes having different style of nomenclature. / { model = "TI AM335x BeagleBone Black"; ...
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1answer
89 views

Applying Linux rt patch

I'm trying to apply the rt-patch to the standard kernel from kernel.org. So far I have tried 3.14 and 3.10 from here: https://www.kernel.org/pub/linux/kernel/projects/rt/ with the corresponding ...
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1answer
245 views

Why does microsoft contribute to the Linux kernel? [closed]

Why does microsoft contribute to the Linux kernel? [L. Latif, theinquirer, 2012 "Microsoft contributed more code than Canonical to Linux since 2.6.32"] Are the contributions focussed on code that ...
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1answer
104 views

Change the kernel in downloaded Ubuntu Image [closed]

I'm adding multiple new system calls to kernel. I want to test my custom kernel by making an bootable ISO out of it trying to boot on another machine. As a part of making this bootable ISO, I got ...
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58 views

Why is necesary to compile the entire kernel for a simple patch?

So I am patching my kernel to fix my Bluetooth and building using this guide https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel Why do I have to compile the entire kernel which takes about an hour?
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51 views

ITEAD Core A20 cant load or Proceed to the FileSytem

i have an ITEAD CORE AW2041, which i wanted to deploy some image on it, i got the image on an sd card but when i deploy it on the device, the booting process gets stuck at the kernel level, any heads ...
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1answer
1k views

Why autoconf.h is not copied automatically to its place?

I'm working on a clean Debian 7.7 install. After the install everything was working fine except the webcam in Iceweasel browser. After reading a lot I found that the best solution is to install ...
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1answer
542 views

Fix grub v2 bootloader configuration on running debian

We have a server running Debian Wheezy. It is connected to a UPS, that's why it basically never went down for years and we never noticed that the grub v2 bootloader could not load the correct kernel ...
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80 views

Trying to understand the wacom tablet plugging in usb causes kernel panic

First, I realise that askubuntu exists, but a kernel panic is probably more GNU/Linux (kernel and low-level system programs) than distro specific. So I already have a solution to mitigate the kernel ...
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382 views

rebuilding my grub2 menu based on my one installed kernel

tl;dr : I have one kernel now on fedora and want that ONLY with Windows 8 to show up on my boot menu. I've been tweaking and geeking with linux kernels. Then I wanted to clean up my boot menu. So ...
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32 views

Investigating Active MemInfo

I am seeing high Active usage when I do a cat /proc/meminfo : MemTotal: 65965328 kB MemFree: 51640992 kB Buffers: 1050332 kB Cached: 8516112 kB SwapCached: 0 kB Active: 11512732 kB Inactive: 1878028 ...
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238 views

How to prevent kernel or any broadcast messages from flooding the TTYs?

Because of some hot-plugging issue, similar to what talked of here, the TTY displays show a continuous stream of messages (which are also logged in the /var/log directory). Every text I key in flows ...
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1answer
270 views

linux/shell command to control screen brightness in android

I am working on a kiosk project using an android tablet.If there is no input power to the kiosk for a long time then, the tablet will eventually shutdown.In order to auto-reboot the tab when the power ...
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2answers
110 views

Where can I find the kernel configuration on each Linux distribution?

I'm pretty sure that all Red Hat and Debian based distributions follow the convention of shipping the kernel configuration in /boot/config-*, but what of other distributions? Or, if this convention ...
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2answers
41 views

How to switch cores? [closed]

i am supposed to be writing a code in C++ wherein i should switch the core amidst performing a task(a simple program). My machine is a dual core system. Can anyone please help me out here? ThankYou!
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45 views

Little slow downs in Embedded Linux application

My team is working in an embedded Linux solution for a product where a center application receives and process data from the hardware and sends it to a database and to the interface application. In so ...
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1answer
536 views

How do I install wpa_supplicant on bare embedded (ARM) linux (3.0.8)?

Environment FriendlyARM mini210s Linux 3.0.8 armv7l Cross-compilling I need to install wpa_supplicant, how do I do that? Shall I get the source for wpa_supplicant and place it somewhere in my ...
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121 views

What does “acpi PNP0501:00: Still not present” mean?

On my new laptop, I have an error in dmesg which occurs every 2 seconds: acpi PNP0501:00: Still not present What does this mean? How to troubleshoot it?
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419 views

How do compile Linux Driver for Netis WF2190 Wifi dongle for FriendlyARM mini210s?

GOAL I want to install the Netis WF2190 wifi dongle linux driver onto my FriendlyARM mini210s. Environment FriendlyARM mini210s S5PV210 ARM Cortex-A8 Board ... running Linux 3.0.8-FriendlyARM ...
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1answer
61 views

How do I get linux-gate.dso on a newer linux system?

I would like to find out which method my 32bit QEMU guest is using for system calls. There's an excellent article explaining linux-gate.dso (http://www.trilithium.com/johan/2005/08/linux-gate/). ...
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516 views

linux 3.17 supports hotplug of thunderbolt of non-chained thunderbolt devices — what is this?

Linux 3.17 has a commit which supports hotplug of thunderbolt of non-chained thunderbolt devices. But what does "non-chained thunderbolt devices" mean? Is a thunderbolt to ethernet adapter a chained ...
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2answers
121 views

Is system call the only way that a user program can intentionally affect the state of a Linux kernel?

I think there are several ways that a user program can intentionally affect the state of a Linux kernel. By invoking a system call; By invoking mmap() and writing the memory that has been mapped to ...
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23 views

Linux 3.x: Supported platforms

Where do I find an (up-to-date) list of supported CPU architectures of the current 3.x Linux kernel? As far as I understood the ucLinux merged their code into the official kernel. Is there any ...
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138 views

Utility to list and modify kernel modules loaded at system startup

How do I list all kernel modules loaded while system startup? Is there a user space utility to list and modify the modules loaded during system startup? I am working on RHEL6 Desktop and RHEL6 ...
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1answer
251 views

Some basic questions about Linux kernel's security [closed]

I don't know much about Linux kernel, and I have some questions. What is the main purpose of separating kernel memory from user-space memory? To make sure that a user application cannot do anything ...
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506 views

device descriptor read/64, error -71

I have problem with USB ports on MSI WIND laptop. I have FC17 installed and usb printer sometimes not responds. If I replug a printer in USB port - it's working. Tried to change usb cable and printer ...
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1answer
76 views

Do all devices under Linux have a device node?

I know that each device on Linux is either a char or block or network device. Do all physical devices that exist on Linux have a device node under the /dev directory? I'm not talking here about ...
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145 views

What entropy sources are used by the Linux kernel?

man 4 random has a very vague description of Linux kernel entropy sources: The random number generator gathers environmental noise from device drivers and other sources into an entropy ...
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207 views

No network interface in QEMU

My network interfaces never shows up in my guest computer. I'm compiling a linux kernel (3.3 I think) from scratch with default settings + Symbol: NE2K_PCI [=y] Type : tristate Prompt: PCI NE2000 ...
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224 views

HP SmartArray RAID5 recovery on linux

This is a long time in the making, and I've finally got it working so I thought I'd share this with as many people as I can in case they're in a similar situation. Long story short - HP SmartArray ...