Everything about UNIX kernels: development, configuration, compilation, design, etc.

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Unable to verify the kernel signature “gpg: Can't check signature: public key not found”

In order to compile a new kernel on my Debian jessie, I am trying to verify the GPG key , following the instruction on the official website. I have download the the linux-3.18.35.tar.sign and linux-3....
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28 views

Kernel and User space System Calls [closed]

I understand some complex internal of OSes, but I have a large gap in understanding kernel and user space. I will explain how I understand this now. First of all we have RAM for example 8GB, ...
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3answers
78 views

Why do we need initramfs and initrd

I understand the purpose of the this concept. For example we have exotic file system on the disk and in order to load system we need mount root filesystem. But we cannot because there is no suitable ...
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25 views

redhat + how to install only the latest kernel from kernel security packages

I am not sure but I found the installonly_limit parameter from yum.conf when we set installonly_limit=1 , Dose this mean to install always the latest kernel ? for example if security packages ...
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52 views

What are linux long term support kernels?

I'm running an arch linux server and recently switched to an lts kernel from the repositories. Since I'm not rebooting the server very often, I want a stable kernel that is supported for a very long ...
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54 views

Why is /lib/modules so huge under my gentoo, compared to Ubuntu

I have a Gentoo installation. For compiling the kernel I used the configuration from Ubuntu 14.04 kernel. I find it hard to understand why the sizes of the modules libraries are so different: In ...
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43 views

grub2 + how to print the current index according to grubby --info=ALL

how to verify in linux 7 , what is the current index that have the current kernel version for example I want to know if the kernel - 3.10.0-327.18.2.el7.x86_64 is located in index=0 or index=1 or ...
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61 views

how to capture the latest kernel version from grub.conf

how to capture the latest kernel version from grub.conf ( in case default=0) for example the latest kernel from the file is 2.6.18-409.el5 # all kernel and initrd paths are relative to /...
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38 views

linux + grub.conf not exist

I just need to check some redhat machine version - 6 and I notice that grub.conf inst exists how this Linux machine know with which kernel to start? ( in case grub.conf not exists ) is it safe to ...
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29 views

How to print the latest kernel version from grub.conf on Linux 7

On Linux 5 and 6 I can print the /etc/grub.conf How to verify the latest kernel version on Linux 7? , like we do on Linux 5 and 6 from grub.conf #boot=/dev/sda default=0 timeout=15 #splashimage=(hd0,...
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Unable to compile Linux Kernel 4.7-rc2

I was trying to compile Linux Kernel from source. I've compiled the kernel previously and never got any error. But this time I am facing an error. The error is CHK include/generated/asm-...
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50 views

What happens if dbus connection fails?

I am trying to find a root cause for server hung. I found that a process crashed with process id 14900 and the following are the log in message. No core dump is saved as it is not related to any ...
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16 views

Package additional in-tree modules

Targeting an up to date Fedora whose kernel unfortunately lacks a module: Is it possible to package the module (using kmod or whatever existing infrastructure), so that the module package has the ...
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250 views

Too many rcuos and rcuob processes in my VM

I am running CentOS 7.2 (3.10.0-327.18.2.el7.x86_64) as VMware guest with 2 cpu and 6 GB RAM on my Lenevo W540 iCore 7 having 32 GB RAM. I see 128 processes each for rcuos and rcuob in my VM. This ...
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96 views

kernel messages “lost 9599 rtc interrupts”

I just started getting these messages on my Fedora 23 x86_64 system. Can someone tell me what they mean please? rtc broken or failing? Jun 4 01:32:54 fc23 kernel: hpet1: lost 9599 rtc interrupts Jun ...
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49 views

Linux video capture does not work cam3 or Image capture in cam1 fails

I am trying to some solution or run-time fix on this. Problem: After connecting a 3rd camera, Linux video capture does not work cam3 or Image capture in cam1 fails. History: Initially, we ...
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53 views

Update kernel on ARM device

How can I update the kernel of my ARM device? The device I have been using is A20-Olinuxino LIME board, withDebian GNU/Linux 7.6 (wheezy) image booted from NAND. The uname -a command displays 3.4.102....
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64 views

Debian installation does not boot, shows iwl3945 0000:03:00.0: Could not read microcode: -12 error repeatedly instead

When trying to boot my Debian laptop, I encountered this error: May 31 06:59:44 Termina kernel: [28753.081242] iwl3945 0000:03:00.0: Direct firmware load failed with error -2 May 31 06:59:44 Termina ...
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41 views

qemu infinite loop on boot

I'm currently trying to set up a virtual machine emulating a ARMv7 Cortex-A8 on a x64 host running qemu. I've got a zImage which was built with the realview defconfig and a rootfs in cpio format. ...
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2answers
41 views

Updating kernel: vmlinuz in /boot not being created by DNF

Brand new F23 install, trying to update the kernel. I did lose power during the first round of dnf update and have to go clear out a bunch of conflicts that dnf kept reporting. It's possible I removed ...
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45 views

Possible slab memory leak related to bio and btrfs?

I'm currently running a rebuild on a btrfs NAS (~20TB) that had a drive failure. It's going to take a few days. My problem is about once every 24 hours the RAM filled up and the kernel starts killing ...
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34 views

Push firmware files in ath10k to Debian firmware-atheros

I would like to quote wireless.wiki.kernel.org: The ath10k firmware images are available from linux-firmware.git which all common Linux distributions should install by default. Latest firmware ...
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40 views

Partitioning (format) problems with LiteOn PCIe SSD

I recently got a HP Z Book 15 g2. That model has two disks, one of them (in my model) is a LiteOn PCIe SSD (Liteon CX1 JB256 HP). I want to install Linux on that particular disk. First, I tried with ...
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How to find a specific patch for a kernel file

I've been debugging an issue in my linux kernel and have found a fix for the issue. Checking cross reference, I can see that the fix was applied to that file between kernel version A and kernel ...
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128 views

Why kernel may be throttled?

My MBR start freezing up for over hour and I've found that my kernel reported being throttled, e.g. (this is just a sample for 2 seconds) $ sudo fs_usage | | grep -i throttled 12:26:45 THROTTLED ...
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175 views

Centos 7 not loading latest kernel at boot

By default, centos 7 comes with kernel version 3.10.x. After installation of centos 7, I have upgraded kernel to 4.6.x that is latest stable version. My system is remote. First, it is very expensive ...
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47 views

psmouse kernel module recompiling

I have a ultrabook and its touchpad doesn't work. Linux mike 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-1 (2016-03-06) x86_64 GNU/Linux touchpad doesn't work and it is also not listed in output of ...
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75 views

insmod: cannot insert './intrpt.ko': Function not implemented

I'm writing a kernel module that receives interrupts for mpc8308 (PowerPC) board. when I make the code for Ubuntu and my current version of kernel it works well with interrupt of keyboard, but when I ...
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1answer
321 views

How to switch arch linux to lts kernel?

I'm running a headless server installation of arch linux. The high rate of kernel upgrades caused me some maintainance headache and I therefore wish to switch to the lts kernel. I already installed ...
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1answer
31 views

WiFi card disappears after reboot, but not after cold boot

I have an Arch-based server (Zotac Nano, AMD Kabini-based) which doubles as WiFi access point using a miniPCI Atheros WiFi card. If I start it form cold boot (as in “it was off”), then everything ...
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41 views

Linux + what are the steps use the oldest kernel version in place of the current

I have Linux red-hat 5 version I want to reboot the machine with the previous kernel - 2.6.18-408.el5 so I set the default to 1 but before I will reboot the machine to startup with the older kernel ...
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25 views

Packing a bootloader as kernel image

Can a bootloader (lets say lilo) be packed as a valid zImage to trick other bootloaders to chainload another bootloader? Sorry about my english and excuse me if I am not clear enough.
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46 views

How to remove all old kernels except the two latest

The following command deletes all kernels except the latest: package-cleanup --oldkernels --count=1 Does the following command delete all but the two latest kernels? package-cleanup --...
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2answers
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scripted configuring of a linux kernel

Given a list of kernel features, I want to create a minimal linux configuration supporting all given features (and the corresponding dependencies) but nothing else. Is there a way to create a ...
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48 views

Why should not I update to most recent kernel immediately after release [closed]

Question intended for system administrators. Consider system running a old but working kernel and all the required functionality is available. (Ubuntu 12.04 LTS specifically with kernel 3.2) Then a ...
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69 views

Invalid Build path for driver creation

I wanted to create a simple Hello world driver as in here: Page2 and compile it with Makefile: obj-m := hello.o all: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules clean: ...
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Can I start the VM in openVZ once the checkpoint is completed during vzdump?

I have a VM with huge amount of data, close to 800GB. I was taking a vzdump of this VM. During the vzdump, openvz suspends the vm and does a check point and does a final sync of data before completing ...
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104 views

No perf (linux-tools) for kernel 4.5.2

When I first installed 16.04 LTS, at kernel 4.4.0, I had a decent battery life of about 3 hours average, but I upgraded to 4.5.2 to solve the suspend problem and some other issues, and now it's less ...
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28 views

Missing NIC in CentOS 5 - AsteriskNow 1.7.1

So I have two nics, but I can't get the second to load, here is the output from lspci -vvv 04:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection Subsystem: Super ...
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1answer
57 views

Linux red-hat + kernel patch update

I need to run the yum update on my Linux redHat machine during the yum update , I sow that yum perform some patch kernel update therefore I little worry to perform a reboot , because the patches of ...
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79 views

Remove the new kernel

I was working without any problem and one day the computer didn't start he said that there is a problem in the Xserver , so I connected to my computer through ssh and reinstalled xserver-xorg ,xserver-...
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47 views

Compiling a kernel on STLinux

I have recently accessed STMicroelectronics Base Distribution with BusyBox v1.18.2, built-in shell. I read all the information on STLinux documentary regarding my problems, and followed all the steps....
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1answer
161 views

Unable to boot after updating the kernel rhel 6.7

I am having a Red Hat 6.7 running on VM which I updated with the latest version kernel-2.6.32-573.26.1.el6.x86_64. but after this update I received the below error: kernel panic-not syncing: VFS: ...
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1answer
46 views

How do I run the Linux kernel?

I'm reading Robert Love's Linux Kernel Development in order to learn more about, well, Linux kernel development! But in Chapter 2: Getting Started with the Kernel, I'm instructed to download and ...
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Qualcomm Atheros AR298X not working with recent kernels

My wifi doesnt work. It used to when the kernel was 3.18 or less. If I have a kernel more than 4.1 it will not work. I would like to use ubuntu 16 and I don't want to downgrade the kernel. lspci | ...
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Kernel bug at at fs/dcache.c on XenServer

Yesterday on of our servers running Xen 6.5 restarted, in /var/log/messages I found following messages: Apr 29 11:52:59 server kernel: [7476681.051566] ------------[ cut here ]------------ Apr 29 11:...
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55 views

Dracut failure when trying to boot Fedora with Qubes kernel

I would like to boot Fedora 23 Workstation x86_64 with a kernel from QubesOS 3.1. I have copied vmlinuz-4.1.13-9.pvops.qubes.x86_64 and initramfs-4.1.13-9.pvops.qubes.x86_64.img into the /boot ...
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Designing a new Operation System

I want to design a new OS to learn more about how an OS works. This OS is only for educational purpose and I had a few doubts choosing its kernel. Is there any legal issue for using an Ubuntu kernel?...
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133 views

How filesystem atomically writes a block to disk?

Block is an abstraction provided by filesystem, block size is integer multiples of disk sector size. Suppose a filesystem uses 4K as its block size, and the disk sector size is 512B, when the ...
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Home directory does not mount on kernel update

My home directory will not mount on booting with new linux kernel. Previously, my home directory has been mounted automatically from a network device. I updated my kernel to 4.6.0 from the git ...