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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Need help resolving kernel panic - not syncing: timeout synchronizing machine check over cpus

I'm attempting to install Xubuntu 15.04 x64 on a brand new high end laptop. I've already fixed a problem with the NVidia cards and needing to set nomodeset on boot but now I get this one kernel panic ...
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6 views

Network IO throttling in cgroups

cgroups allow the user to manage the resource usages of processes or groups of processes. Block IO throttling is supported and works well. Why is it however that network IO throttling (specifying hard ...
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1answer
16 views

Signing Error during kernel compilation

I was trying to compile kernel on my system by following this link http://www.ramkitech.com/2012/04/how-to-compile-kernel-step-by-step.html when I run make command, I am getting the following error ...
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11 views

F2FS issue - unsuccessful remove, lost access to files

While removing unnecessary files I bumped into an error. with fsck.f2fs /dev/sda4 -t I can see | | |-- Die Ärzte - Manchmal haben Frauen <ino = 0xc11874>, <encrypted (0)> | | ...
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0answers
20 views

How can I install Windows on my laptop after an error while installing Linux Mint?

I made a bootable pendrive of Linux Mint by PowerISO. When I was installing the distro there was an error. So I decided to install Windows 8.1 on my PC—an HP AC026TX laptop—but in Windows setup wizard ...
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409 views

Program xxx tried to read /dev/mem between xxxxxx->xxxxxx

I've got a program that runs on RHEL 6.5 perfectly fine on a virtual machine generated with OpenStack. But since I updated my version of OpenStack (from Mirantis fuel 5.0 to 6.0) I have a new instance ...
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0answers
10 views

An interrupt of a DMA(=Direct Memory Access) and a running kernel process

Can an interrupt of a DMA(=Direct Memory Access) stop a running kernel process?
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0answers
9 views

LFS (Linux From Scratch) USB boot crashing

A hard drive in an enclosure has the following, assume that this drive is being recognized by grub2 as hd0: partitions 1 to 3 are primary partition 1: /boot (boot partition) partition 2: / (linux ...
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1answer
20 views

How to get mac address of a device using linux without using automatic tools?

I want to know if there is a method to obtain mac address of a protected(wpa 2 ) wifi hotspot or network without using aircrack -ng , airdump-ng,etc. But rather by some basic command.
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1answer
53 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 ...
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15 views

How do i compile module with different active kernel/kernel-after-reboot versions?

Hope the title is clear. Let me explain, updated my kernel but have to recompile the wifi module to work with the new one. The thing is, cant reboot and compile, because it's my media server which i ...
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0answers
111 views

Opensuse 13.2 kernel upgrade to stable version (4.1)

I have opensuse 13.2, and i try to upgrade kernel to last stable version. I adding http://download.opensuse.org/repositories/Kernel:/stable/standard/ to repository and try to upgrade with sudo ...
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1answer
103 views

Repair bootloader for fedora 22 after install windows

I already have fedora 22 and windows 7 in my machine , i wanna to upgrade to windows 10 but in fact i'm afraid to losing fedora i have read the fedora documentation but still afraid to start this ...
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0answers
13 views

How JTAG works with Hardware

As i know there is 4 pins(TCK,TMS,TDI and TDO) and it convert in 32 pin (PC) and vice versa, but i want some more knowledge about this. There are online references : ...
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1answer
28 views

CentOS 7 image naming conventions

I'm looking at the following on CentOS 7: boot$ ls config-3.10.0-229.7.2.el7.x86_64 config-3.10.0-229.el7.x86_64 grub grub2 initramfs-0-rescue-9fde7dd9a7884e1b8fdef68620955b36.img ...
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0answers
20 views

How to downgrade kernel of samsung device SM-T230

I am facing a weird problem. My client reported that our game(which is based on cocos-2dx 2.2.6) displays black screen after focus change on one device namely Samsung Galaxy Tab 4 SM-T230 the Log ...
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0answers
10 views

Can kexec be used to start Linux on a separate partition?

Assume I have two partitions. Each contains a full installation of a different distribution. I know kexec is like using one kernel as a bootloader to start another. But can this process be used to ...
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1answer
19 views

USB device driver module getting killed while executing insmod?

While running make, it is showing no warnings or errors, but when I am inserting the basic USB device driver module inside the running kernel, then I am getting a "killed" message. Here is my code: ...
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1answer
30 views

Why an OS has same name on different achitectures?

What is the similarity in running a same OS (like Linux) on different architectures? I mean, we cannot run Linux x86 apps on Linux ARM. And even the OS itself is constructed differently for different ...
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1answer
17 views

Unable to find linux Kernel Headers

I am running a custom kernel(I am not the creator of it). I need the header files for the same. . I have tried installing the header files using this command. sudo apt-get install ...
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0answers
13 views

Possible problems of down grading linux-kernel

I am running a Open Network Linux on a switch, it is running a 3.8.13-OpenNetworkLinux-e500mc-1.5, which is a variant of linux kernel 3.8 . I want to change to linux kernel 2.6.27. Will there be any ...
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0answers
14 views

Strange noise with alsa-oss-emulation

I try to access the sound chip via ALSO OSS emulation on a ETX-BT-module (x64-CPU, x86-Kernel, vanilla kernel 3.10.10, busybox, Realtek ALC 262, 4-channel High Definition Audio integrated into SOC ...
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0answers
60 views

USB drive not getting recognized as scsi device in custom linux kernel

I am facing a slow write speed problem with a USB drive in my custom linux kernel. I suspected to be a hardware problem but with the same hardware and Opensuse 12.1 OS, write speed of my USB drive is ...
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1answer
73 views

System hangs when using too much RAM even with swap off

When I run a piece of python code that uses too much RAM, my computer would start to swap so badly that I had to do a hard reboot. To fix this I turned off swap assuming that the OOM killer would ...
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36 views

Ubunbtu 12.04 iptables error after upgrading kernel to 3.4

I been using Ubuntu 12.04 for well 3 years and using it with kernel 3.2. I decided to upgrade to kernel 3.4 because some freezing problems starting to occur more and more. Well the update went well. ...
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1answer
56 views

In Linux, how is a program loaded into memory when the OS decided to run it?

As we know, Linux implements page cache to store the code or data from pieces of a file that will be potentially used. One of my question is, when a program, e.g. vim, is going to run, its data and ...
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21 views

notebook asus x551ma - moire pattern takes place - how to reduce effect on linux

I just faced a strange issue with my notebook asus x551ma LED and LCD (the Moire Pattern) which is quite good described on wiki pages; Some users provide "how they handle the effect for their ...
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2answers
23 views

How can I tell what process is unmounting a file system?

I am trying to troubleshoot an issue with a fuse library, where it appears that someone is causing my file system to be unmounted soon after it is mounted. Does anybody have any clever ideas how I ...
0
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1answer
19 views

dmesg -n 7 doesn't print anything, but dmesg prints a lot

As stated: $> dmesg [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Initializing cgroup subsys cpuacc ... $> dmesg -n 2 [ ...
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1answer
43 views

Sharing a hard drive between two hosts, one at a time

I have a large hard drive in my desktop computer. My laptop has an eSata port. Sometimes, I power-up the desktop PC, without booting, just to get juice flowing into the hard drive so that I can ...
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1answer
113 views

Force a Linux kernel module to be compiled as a module instead of built-in

I have the sources of the kernel of an embedded Linux box (specifically a QNAP NAS) which is running a 64-bit v3.12.6 Linux kernel, together with the kernel config files. What I'm trying to do is ...
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1answer
115 views

How to change the default terminal beep frequency of the PC speaker?

I want to change the default sound frequency ofSND_BELL(which is used when\aor BEL or ^G is printed on the screen) to higher values (the current default is around 750Hz). Of course this turn to need a ...
1
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1answer
23 views

Ubuntu 10.04 | Terminal Freezes on certain commands | MTU

Isolated problem: I try to cat /etc/rc.local and I can't do anything in the ssh session after that. I've tried many of the common things, but it seems to freeze on any command, but I can do an ls, ...
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1answer
58 views

VirtualBox broke Fedora networking - how to fix it?

I was trying to install VirtualBox in my Fedora 21 machine. However, the cited machine has Secure Boot enabled and obviously VirtualBox startup failed miserably due to lack of signing in its modules. ...
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1answer
87 views

Uninstall latest kernel using yum

The latest kernel kernel-3.10.0-229.1.2.el7.x86_64 panics at boot on my CentOS 7 box due to a kernel bug. Since this kernel is the default in GRUB, if I forget to manually change the kernel selection ...
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0answers
81 views

Kernel building with CONFIG_LOCALVERSION doesn't work with fakeroot debian/rules binary-generic?

I'm following the instructions in https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel and I've set CONFIG_LOCALVERSION in the menu to "xhci_mod_test". I then run fakeroot debian/rules and it proceeds ...
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23 views

Which devices in /sys/block are HDDs?

I'm interested which devices in /sys/block are real HDD drives: [root@sdp1a block]# pwd /sys/block [root@sdp1a block]# ls dm-0 dm-12 dm-3 dm-7 loop1 loop5 ram1 ram13 ram3 ram7 sdaa sdae ...
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21 views

How to change kernel message VT in linux

I feel kinda stupid, since I'm certain I used to know this. But here goes. How can I change which VT kernel messages print to? I use text-mode primarily, typically on vt1. Unfortunately, kernel ...
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0answers
44 views

Build DAHDI for Beagleboneblack Error

I'm planning to build DAHDI for Beagleboneblack Firstly, I built the kernel for BBB completely by following this tutorial http://elinux.org/Building_BBB_Kernel make ARCH=arm ...
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0answers
25 views

Thinkpad Edge E545: Failure to load kernel through efi

Now this is an issue I've been battling for a long time ... I am trying to make a proper UEFI dualboot system, the problem is I cannot seem to load gentoo kernel either simply by using EFI stub (also ...
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0answers
47 views

Why should an interrupt context not sleep?

I have learned that, on Linux, an interrupt context should not sleep because it cannot wake up again. Why can it not wake up? What happens if it goes to sleep?
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1answer
81 views

how to enable pci hotplug support in ubuntu 13.04

Kindly help. I have a pci-based wifi adapter which is not getting detected when i plugged it into the laptop. OS: Ubuntu 13.04 Kernel version: 3.8.0-19-generic
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2answers
3k views

Where are Kernel Headers for Fedora 21?

I'm trying to install VMware on Fedora 21. I've installed the kernel headers: sudo yum install kernel-headers-`uname -r` And I receive the following message: Package ...
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0answers
24 views

cpusets compiled in kernel but not visible when running

Device: radxa ( 4-core ARM ) the official kernel from radxa is used with the ubuntu 14.04 rootfs : https://github.com/radxa/linux-rockchip.git. As cpusets where not enabled in def_config, i enabled ...
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1answer
71 views

Where is /sys/subsystem as described in Linux kernel doc?

Quote from https://www.kernel.org/doc/Documentation/sysfs-rules.txt: [...] It is planned to merge all three classification directories into one place at /sys/subsystem, following the layout of the ...
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1answer
33 views

What's the minimum overhead of a Linux container?

If I understand this correctly, a container, once running, shouldn't have any CPU overhead. Is that correct? It does have a memory overhead. How big might that be? How would I measure it?
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43 views

How can I change a ChrUbuntu 12.04 install over to Arch ARM on a first generation Samsung Chromebook XE500C21?

I installed ChrUbuntu 12.04 on my Chromebook (Samsung XE500C21) using this script. Is there a way to swap my distro over to Arch ARM? Failing that, is there an easy way to install Arch ARM on the ...
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1answer
49 views

Does the guest OS need updates/changes after changing the number of cores in VMware Player?

I installed ubuntu on a vm in VMware Player and forgot to change the number of cores from 1 to 8. If I change that now will the linux kernel need to be recompiled or anything like that or will it just ...
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0answers
64 views

UBI ERROR: Attach Error

I get this UBI error while I try to attach mtd device. [root@npa-be ~]# ubiattach -d 0 -m 3 UBI: attaching mtd3 to ubi0 UBI: physical eraseblock size: 1048576 bytes (1024 KiB) UBI: logical ...
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114 views

Using a gif for linux kernel boot up

I want to use either a gif or multiple looped images instead of the default linux boot up image. I know it is possible to replace the default image with another image, but is it possible to use a gif ...