This tag is for questions about the internals of the Linux kernel itself - particularly about use or configuration of kernel modules or drivers.

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8 views

container running CentOS7 on a Centos6 host?

I thought that the containers uses the same kernel as the host... so I thought OS using different kernel versions wouldn't work and I did a test to prove this: I created a VM on virtualbox and ...
2
votes
2answers
5k views

How do I stop rfkill module from hardblocking my wifi, without rfkill command?

I went into my BIOS the other day, didn't change anything, and rebooted. After this, my wifi was hardblocked. I looked online for solutions, and learned of the rfkill command. But I get rfkill: ...
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2answers
5k views

`cat /proc/kmsg` outputs broken text

cat /proc/kmsg is convenient way to follow kernel messages. But the output is unreliable. Example: < eoyfl-o-ilF ilaltssI hwflssesJ a hwbctaealatv-psL hwmmr-sg()nc-l-TtssN oeOfso-eitr()so-l-iesQ ...
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1answer
49 views

Which address space is used in system calls? physical? or virtual?

Explanation There’s two kind of address space virtual and physical. On the physical model (typically used by the kernel) the memory is bounded and each address correspond to physical ones. The ...
7
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3answers
21k views

Linux kernel hangs at 'Switching to clocksource tsc" on Pentium 4

Hardware: Dell Dimension 4500S : i845G, Pentium 4, stock + 2GB RAM and latest (circa 2002) BIOS update. I've been building a Linux system from source, so far it's LFS 7.0 by the book. The first ...
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votes
1answer
13 views

error when booting Linux kernel 4.4.2

I compiled a Linux kernel 4.4.2 on my Kali Linux distro with make allyesconfig. When I booted it up it is saying end of kernel panic - not syncing : fatal exception and stopped. What is the ...
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1answer
3k views

What do these error messages mean and how to fix it?

============================================================== actually I figured out this is an issue of intel video driver:http://lkml.indiana.edu/hypermail/linux/kernel/0902.3/01703.html ...
0
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1answer
492 views

Ubuntu is running in low-graphics mode

This error appears during Ubuntu 10.04 start up and I can run in low graphics mode. I tried to install the NVIDIA driver and then it works but when I reboot Ubuntu this error appears: (EE) NVIDIA(0): ...
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0answers
19 views

Unable to mount boot partition

I have compiled a custom environment using Yocto. I have most everything working now, but I've hit one major problem. The system boots fine, but after it does, I can't mount the boot partition. ...
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0answers
7 views

remove link form Linux namespace

I created a namespace in Linux with 'ip netns add foo', created a pair of veth interfaces and moved one in the namespace. I set up IP addresses etc., so that now I can ping my 'foo' namespace from the ...
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0answers
21 views

initramfs boot error on dual boot machine

Scenario: Dual boot windows7 and ubuntu machine. I downloaded a new linux kernel and then implemented 3 system calls on it. Then I compiled the kernel on ubuntu and tried to boot into the newly ...
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0answers
212 views

linux bluetooth firmware missing

The kernel is trying to load a bluetooth firmware version that does not exists. dmesg: [ 4.435796] Bluetooth: hci0: read Intel version: 370810011001140d00 [ 4.436742] bluetooth hci0: Direct ...
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1answer
26 views

How to handle this warning: The Linux source in /lib/modules/3.19.0-25-generic/build has not been configured

I am trying to install a Sangoma PRI card on a Ubuntu 14.04 LTS. During installation of the drivers, it gives me this warning, followed by other errors which are a consequence of this issue (or so I ...
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0answers
16 views

Disable RAID in custom kernel?

I need a Gentoo 13 machine to test some software on the platform. I'm not a Gentoo regular, so I'm suffering their procedures. I noticed the kernel spends a couple of seconds booting due to RAID ...
2
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0answers
94 views

Linux boot fails with /dev/disk/by-uuid/XXXX does not exist - Asus Zenbook Pro Touchpad Not Working

Device: Asus Zenbook Pro ux501vw-ds71t Ubuntu Version: 15.10 I installed Ubuntu 15.10 and the installation was successful. However, the Elantech touchpad did not work. I read that the newer ...
1
vote
1answer
49 views

How to pass CONFIG_BUILD_DOCSRC=n to genkernel?

I need a Gentoo 13 machine to test some software on the platform. I'm not a Gentoo regular, so I'm suffering their install procedures. I'm at Configuring the Linux kernel, and it failed with: ...
0
votes
1answer
412 views

Kernel 4.4.1-1 fails to boot - root volume “does not exist” - 3.10.0.327 and 4.3.3-1 both continue to boot fine

I'm trying to install and boot kernel-ml (currently 4.4.1-1) on RHEL 7.2 following the instructions here: http://linuxg.net/install-kernel-4-x-on-enterprise-linux-7-centos-7-and-rhel-7/ Install works ...
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2answers
497 views

AMD driver installation kernel header issues

I am having problems getting the AMD linux graphics drivers installed; every time I try to install it errors saying that it cannot find the kernel headers. The current kernel version running is ...
0
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1answer
545 views

Error building mvfs

I am trying to build mvfs so that I can run IBM Rational ClearCase on a CentOS 6.4 machine. I have all the dependencies installed so I cd to the mvfs_src folder and get the following error while ...
-2
votes
2answers
63 views

How to get linux terminal print info and save it to a file

How to get linux terminal print info and save it to a file? there are print information about the application, there are kernel print information.I want to save all the terminal program's output to a ...
1
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2answers
4k views

__modver_version_show undefined error when building linux kernel 3.0.4 version

I tried to build the linux kernel 3.0.4 on ubuntu 11.10 in virtualbox. Here are my steps: Download the source code tar xjvf linux-source-3.0.0.tar.bz2 cd linux-source-3.0.0 make menuconfig, changed ...
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0answers
5 views

Enabling TransHugePage in User Mode Linux

I am running User Mode Linux with Gentoo file system and using 32 bit Linux kernel version 3.12.36. I am not able to enable THP because I am not able to find the requisite file: ls /sys/kernel/mm ...
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0answers
19 views

Flashing Linux on Ncommputing L300 board

I have a bunch of L300 Thin client nodes which are of now use to me any more. I plan to give away the units after flashing linux into them, because as a standalone device wont achieve achieve ...
0
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0answers
26 views

Install x86_64 kernel on already installed i686 system

I have a 64-bit machine with Arch Linux i686, while the processor (Intel Pentium G3258) could support 64-bit. Being a 32-bit OS I can only use 3Gb of RAM out of the 8Gb installed. Since I have a ...
0
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1answer
16 views

How does encrypting /home partition with ecryptfs on linux stop malicious modification of /boot or /(root)?

This is a page where a developer of ecryptfs explains the difference between ecryptfs and dm-crypt: ...
1
vote
1answer
12 views

why is openat() needed to avoid a two-step race condition with stat and then open()?

The explanation at http://man7.org/linux/man-pages/man2/open.2.html about why openat is needed, reads in part: openat() allows an application to avoid race conditions that could occur when ...
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0answers
33 views

Custom Android kernel with Sys V IPC

I know that Android uses Google's own Binder IPC, which is built-in to every Android kernel. This causes a dilemma for running GNU/Linux systems on a mobile device: keep the Android kernel, and ...
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0answers
30 views

ACPI doesn`t work properly?

My PC with next parameters H/W path Device Class Description =================================================== system P5K PRO (To Be Filled By ...
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0answers
20 views

Linux: Why UID and GID are 0 despite not being the root user?

Just a question here. I was looking through my program and its pid, uid, gid. And I found UID and GID are 0 but I'm not signed in as a root user. Why is this the case? And I am curious if UID and ...
1
vote
3answers
41 views

How to launch vmlinuz-linux from efi shell?

How to start vmlinuz-linux from efi shell ? I jump into the ESP and type vmlinuz-linux (vmlinuz-linux is in the ESP) but it says vmlinuz-linux isn't recognized as an internal or external command, ...
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0answers
14 views

How to Disable Linux kernel tracer

I have installed Ubuntu 12.04 (32bit). The current tracer is set as nop. cat current_tracer nop cat tracing_on 0 Although the current tracer is nop and tracing is disabled, all these following ...
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5answers
2k views

Does linux have any measures to protect against fork bombs?

#include <unistd.h> int main(int argc, char* argv[]) { while(1) { fork(); } } I run this program on my linux, nothing outputs on the terminal, the OS seems go dead. Does linux have ...
1
vote
1answer
31 views

Virtual machine running a *newer* linux kernel?

Is it possible to, for example, have the main system be Ubuntu 15.04 and install a virtual box that runs Ubuntu 15.10 inside of it? Or does the host system have to have a Linux kernel that is at least ...
0
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0answers
32 views

Cannot find root device when loading a new kernel image

I am trying to install an old linux kernel image 2.6.32.69 just for learning purposes. The machine is ubuntu 15.10 32 bit. The commands to build kernel are: make oldconfig make bzImage make modules ...
5
votes
1answer
179 views

Hairpinning in Linux

I have a router in which I installed a Linux system. I want my router to support NAT hairpinning. Does a such feature exists in Kernel Linux? If yes how to activate it? Are there a patch to apply it ...
2
votes
1answer
2k views

linux; return “RTNETLINK answers: Operation not supported” for dummy interface creation

I am trying to create a L3 interface in kernel v3.4.34, that is not attached to a physical interface/device and this is to be used purely as a management interface as an externally visible interface ...
1
vote
1answer
200 views

sd card not detected at all in linux

My SD card reader is not detecting any SD card. There is no output from dmesg when an SD card is inserted. df does not detect anything and also nothing in fdisk -l. Does linux support SD cards? I ...
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0answers
148 views

How do I fix Manjaro error hibernation device not found on boot?

After installing updates and restarting I got these errors. ERROR: resume: hibernation device 'UUID=long number here' not found ERROR: device '/dev/mapper/ManjaroVG-ManjaroRoot' not found. Skipping ...
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votes
2answers
102 views

kworker is running modprobe every second

Using fatrace, I discovered that on my computer, modprobe runs approximately every second. To find out why, I replaced modprobe temporarily with this script: #!/bin/bash echo "$0" "$@" > ...
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0answers
36 views

Run X window system with CONFIG_VT=n in linux

I have an Arm device that I installed Gnu/Linux on. Unfortunately the full source tree to linux with the patches required to make it work on is not available. There is a close version to the source ...
1
vote
2answers
671 views

How to install kernel rc rawhide in Fedora?

I am new to Fedora and I decided to try it on my new laptop instead of Ubuntu. I have an XPS 13 (9343) and the sound is not working. I researched online and found out that people had success ...
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0answers
23 views

Freeze when starting Windriver os

When I start Windriver OS, it always freeze. And it shows this text in console window: acpid: 0 rules loaded <br> acpid: waiting for events <br> Starting advanced configuration and power ...
1
vote
2answers
542 views

Free space in /boot partition with dependency loop

Summarising my problem is that my /boot partition is almost full but I can't free it up due some dependencies loop. Detailed description: I am running a Ubuntu 14.04.2 LTS which has the /boot ...
0
votes
2answers
6k views

Booting linux without bootloader

I installed Ubuntu-Server in Oracle Virtual Machine and it failed grub install step. At the end of install it gave me a message: You need to manually boot linux /vmlinuz kernel on partition /dev/sda1 ...
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0answers
137 views

My own linux corded keyboard driver and interface to my embedded application

I want to develop my own keyboard driver to my own keypad. I have to use GPIO to identify Key Events and use I2c to get scan code. I am going to develop the driver like this. #include ...
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2answers
138 views

What is the exact different between Linux kernel release and version? [duplicate]

In Linux based operating system we can find Kernel release and Kernel version. So what is the exact different between Release and Version ?
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1answer
20k views

Where can I find the Linux kernel file?

Is there any common directory to find kernel file in all Linux distributions?if yes please tell me how to browse to the directory? Where can I find the Linux file in Ubuntu & RedHat operating ...
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0answers
33 views

How to get config from a EFISTUB kernel?

I am working on getting normal Linux onto a x86 Android tablet. Only kernel I can find is efilinux.efi located inside the system’s ESP (\EFI\Intel\efilinux.efi). But I can’t get config through these ...
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0answers
459 views

How to upgrade kernel in Ubuntu 14.04?

I want to use Docker on my Linux server for which I need to upgrade the kernel to 3.10 or higher. So following this answer I was trying sudo apt-get install linux-generic-lts-trusty, which results in: ...
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0answers
54 views

Disable kernel module loading on custom initramfs.igz

my machine, which runs GNU/Funtoo Linux on one of the 2 raid0 arrays it has, needs an initramfs with dmraid support to boot into the system. During the last 7 years i've been using a custom initramfs ...