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

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Ubuntu: freezing on startup

I recently installed Ubuntu 14.04 on a new ThinkPad laptop as a dual boot with Windows 8. It has been running for a few days without issue. However, when I booted my computer today, it got stuck on ...
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55 views

What is a sync during kernel boot?

If something prevents a Linux system from booting, it is common to see this message: kernel panic - not syncing: [Error Message] But what does "not syncing" mean? What exactly isn't syncing? The ...
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Is it possible to tell if my Linux kernel is custom (i.e. compiled) as opposed to distro?

Taking example of Ubuntu, can we tell if the kernel was custom compiled rather than what comes with distro?
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108 views

Understand Linux kernel virtual bridge port numbering

I have a Linux kernel virtual bridge which contains interfaces eth1 and tap0: # brctl show br0 bridge name bridge id STP enabled interfaces br0 8000.00016c404fa3 ...
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1answer
72 views

Debian: How to get the current loaded kernel package name?

With the following command, I can list all the installed kernel package: $ dpkg -l | grep linux-image With the following command, I get for instance the version of the current kernel used: $ uname ...
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59 views

What do the terms CC, LD and SHIPPED refer to during the Kernel Source compilation process?

What do the terms CC, LD and SHIPPED refer to during the Kernel Source compilation process? Am I correct to assume that [M] indicates that it is being compiled as a module?
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99 views

What proportion of memory does the Linux kernel use of the installed RAM?

I'm developing a compute cluster and I'm trying to determine the maximum amount of RAM I can give to a single process. On a machine with 16GB of ram, the answer is that I can allocate (and touch) ...
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1answer
36 views

XFRM_SUB_POLICY config in kerne

When testing strongswan performance, we saw that the performance differed by a lot between an ubuntu server and a centos server, with everything else being the same. We noticed that the ...
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1answer
59 views

How do I understand if an USB Ethernet adapter is compatible with a certain kernel version to use it to load kernel/filesystem?

I'm using an old kernel, 2.6.32, and I would like to boot the kernel over TFTP and mount the filesystem over NFS. Mounting the kernel over TFTP is a plus, but mounting the filesystem over NFS is a ...
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26 views

Continuety of driver support in linux kernel

I am an embedded GNU/Linux learner. I understand with the new Kernel, driver support for most added hardware is coming through Device Tree Structure (DTS). But I have found out that there are still ...
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23 views

Find the creator of a task

I would like to find the creator task of an arbitrary task in the Linux kernel. However, I am not sure, if there is a way to do this in general. Normally, you can find the creator of a task via the ...
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40 views

Install kernel .deb file without using dpkg

I'm running Manjaro (Derived from Arch). I have a .deb file for kernel 4.0. Is it possible to install the kernel from this file, and what are the steps involved? I tried opening the .deb file and ...
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46 views

add key to proc/keys

How do I add a key to a keyring in /proc/keys ? My openembedded Linux does not come with a keyctl command program. And all I can find on google is the programming interface, but I would like to do ...
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50 views

what if I uninstall all linux kernel images from my system

If I run this: sudo apt-get purge linux-image-* this will definitely remove all linux kernels images from my system. so the question is will I be able to use my system normally until I reboot or ...
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1answer
131 views

How can I edit /proc/net/tcp?

I need to edit 1 line in /proc/net/tcp while the file is also used by the linux kernel for updating other lines of it by the kernel. Background: Each line in /proc/net/tcp represents a TCP socket. ...
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1answer
521 views

Device eth0 does not seem to be present, delaying initialization

I have cloned a fedora and now trying to configure network interfaces. Every time i am adding a new NIC, it starts with number eth3 (rather eth0). i have tried removing and modifying the ...
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1answer
116 views

What happened after I upgraded the kernel version?

I have Linux Mint 17.1 Cinnamon version on my notebook HP Compaq 15-h050nl and about 1 month ago I upgraded the Linux Kernels to the current version (3.18.2-031802-generic) from the last version. ...
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55 views

centos 7 installation with customized bridge module

I have installed latest Centos 7 x64 edition in my server. I need to modify the linux-bridge module with some customized changes and use it as a default bridge module. Currently I am building centos ...
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1answer
106 views

Getting error virtualbox-guest-modules: requires linux<4.0 on antergos while doing system upgrade

I am running Antergos Linux 64 bit on virtual box. when I try to do full system upgrade I get a error: resolving dependencies... looking for conflicting packages... error: failed to prepare ...
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97 views

Identify out of tree modules?

I'm attempting to upgrade and test kernel 3.12. What is the most efficient way to identify out-of-tree modules that should be removed before testing? There are a few mentioned (vitualbox, nvidia, ...
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16 views

“un-select” behavior in kconfig

Are there any ways to generate the behavior of an "un-select" over an option? I don't want the option to disappear ("depends on" behavior), but just the opposite behavior of "select". Thank you very ...
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1answer
91 views

Kernel Firmware for Radeon

I'm building LFS. I was trying to enable Ati radeon drivers in the kernel, but it didn't seem to work, so I did a little Googling and found that the there is something called firmware which the kernel ...
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29 views

installing r8168 driver in centos 4.8

I have installed cent os 4.8 and I am not able to connect to internet from that system. After searching on the net I found that the system has r8169 driver instead of r8168. Now I am trying to ...
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15 views

Different types of pageouts - Data?

In Linux, pageouts are controlled by the following properties /proc/sys/vm/dirty_expire_centiseconds /proc/sys/vm/dirty_background_ratio /proc/sys/vm/dirty_ratio Thus pageouts can happen due to ...
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Problems with file system

I created a partition with EXT4 file system and when I'm writing in this partition frequently the Kernel return the following error: Jan 01 01:17:54 infobuffer360 kernel: r7:c0561280 Jan 01 01:17:54 ...
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79 views

Linux kernel action upon init process exiting

Say I am writing my own init program running on a Linux kernel. What happens when my init program exits with return value 0 ? Additionally is the behaviour different if the return value is non-zero? ...
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how to set or know scaling driver in linux kernel

I am trying to modify the scheduler/governor. For the same I need to know what CPUFreq Driver or scalling driver am I configured to run. 1.Where can I find what scaling driver am I configured to ...
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Find SAS controller that is well supported by the linux kernel

How can I find a SAS controller that is well supported by the official Linux kernel? The controller should use the PCIe bus and needs to connect one LTO-6 tape drive. I have looked through the ...
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107 views

Besides cache, what does the Linux kernel use significant amounts of memory for?

My computer feels really sluggish. According to free, I have only ~200M RAM left and more than a gigabyte had to be swapped out. I know that it is good if memory is used for caching but this looks ...
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42 views

Starting Kdump: FAILED

I am unable to start kdump on my machine. It is prompting Starting Kdump: FAILED. I have edited the /etc/grub.conf file and provide 1024M to crashkernel. I have also provided the path to where the ...
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315 views

Can I make the boot even more verbose than loglevel=7 using kernel parameters?

I have an error when booting on a machine, my machine is stuck with the error message: Booting a command list. I can see this message when I add loglevel=7 and only if I delete the quiet in the ...
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73 views

How to select the tag of the latest non-unstable/release candidate version?

I've downloaded the latest kernel sources: git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git cd linux-stable git tag -l | less and picked v3.9.1. git checkout -b ...
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209 views

Linux Kernel Live Patching - WHATIS and HOWTO?

I am trying to understand a new concept I got to know recently as the Linux 4.0 makes it way to the mainline - "Live Patching". Supposedly this is a new feature enhancement of the Linux kernel. It ...
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Repackage RPM with kernel

I am tinkering with CentOS 5.4 and upgrading the kernel to the latest 2.6.18 build 402. What I need to do is to rebuild the initrd to include a modified init script, then repackage it all into an RPM ...
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isolcpus doesn't work on Ubuntu 14

I added isolcpus=0 to the end of the following line to the file /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=0" The idea, as I understand it, is to reserve core 0 from having ...
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123 views

Upgrading guidance for Cedarview driver in Debian 6 - 2.6.32

Our system runs with Debian 6 squeeze (2.6.32) Kernel with N2600 hardware. I know the version is old. An upgrade is in later plans. Recently, we tried connecting multiple monitors (CRT and HDMI), and ...
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Tegra Mesa GLES without X

I am trying to setup a Tegra 3 (Toradex Apalis T30) based system that will have an OpenGL ES based user interface on a touch screen. Unfortunately the standard Linux4Tegra kernel is seriously outdated ...
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Is the PTTY inside the Kernel or Userspace?

I read, that drivers are a way to expand the Kernels abilities to communicate with hardware devices, since there are so many and will be even more the Kernel has to be expandable. In order to ...
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How to set SyslogIdentifier in [SERVICE] section of systemd service file as empty?

I want to set SyslogIdentifier in [SERVICE] section of systemd service file as empty, so that nothing is prefixed in the logs. I tried below options: 1) Mentioning nothing: SyslogIdentifier= ...
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Yocto menuconfig not working

For some reason the menuconfig menu does not come up when I try launching it from my Yocto installation. I am using the Toradex Yocto 1.6 system as is described here ...
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297 views

What is a Kernel Routine ?

In another answer I met a short overview of the sections of the man pages: commands for $-User system call, that means evoking a function from the Kernel library call, that means evoking a function ...
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1answer
780 views

Does Linux virtual bridge support VLAN's?

Does Linux virtual bridge(configured with for example ip or brctl) support VLAN's? For example configure access ports in different VLAN's and trunk ports with only certain VLAN's enabled. Only option ...
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53 views

web cam starting hangs os

I faced a strange effect as ... when my notebook wakes up from suspend I can start and close my web cam with guvcview 1-3 times; But after while on 3dr or 4th starting attempt (I didn't count for ...
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150 views

How to understand virtual switch in Linux?

I have a following virtual Ethernet switch in Linux: root@vmhost:~# brctl show br0 bridge name bridge id STP enabled interfaces br0 8000.266b04c4a79a no ...
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1answer
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Find out which kernel source files were used when kernel was compiled

I am compiling the Linux kernel for my specific hardware and I only select the drivers/options which I really need. This is in contrast to a typical distribution kernel, where they compile almost ...
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1answer
102 views

git: show which files have changed between kernel 3.18.6 and 3.18.7

I have checked out linux kernel git repository git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git I know how to use git log, git show and similar commands to see ...
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MMU-less kernel?

I would like to try compile mmu-less kernel. From what I found in configuration there is no option for such a thing. Is it possible to be done?
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Cross compile GLIBC : error: Need linker with .init_array/.fini_array support

Whenever I call glibc configure with --prefix=/usr --with-headers=/var/tmp/ubuild.wandboard-armhf.build_dir/armv7a-hardfloat-linux-gnueabi/sysroot/usr/include --host=armv7a-hardfloat-linux-gnueabi ...
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346 views

How to rotate the LCD screen/framebuffer to 180 degree?

I have a custom board with a Freecale i.MX6Q SoC. I am using Linux kernel 3.03.35 and LCD is 3.5 inch RGB type display. I want to rotate my LCD screen to 180 degree. I tried a lot to pass parameters ...
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How to insert a modified ELF loader given the current ELF loader is present?

I need to modify the ELF loader's kernel implementation of an Ubuntu 14.04 distribution. Having downloaded the sources using: sudo apt-get source linux-image-$(uname -r) I ran the configuration ...