Questions tagged [linux-kernel]

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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No networking after real-time kernel installation

I patched and installed a real-time kernel, but since then I do not have network connection. Previously I was running kernel 5.4.0-77 on Ubuntu 20.04 and then installed 5.4.77-rt43. If I run ifconfig, ...
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Is it possible to build Linux kernel inside an LXC container?

I would like to build an optimized kernel for a machine that runs Ubuntu 20.04 but in my scenario I cannot "pollute" the Linux installation with all the dependencies required to do the build....
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What is BIOS EDD <version>, 0 devices found mean in /var/log/messages?

I keep seeing below messages in /var/log/messages on my Linux machine: BIOS EDD facility , 0 devices found My machine is working fine for now, but I really want to know what it is? When I googled it,...
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38 views

location of kernel source code directory in centos 7

I wanted to enable a specific feature in centos 7 kernel. What is the exact location of kernel directory in centos 7.4, so that I can lauch this command successfully inside the kernel source code ...
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is there a way to low-level debug whole memory map / usage of linux kernel system?

I ran into a peculiar problem recently, which I attribute to a bug in Xen guest drivers. Basically I had a VM with 6GB of RAM on which: Userspace processes were using about 500MB of RAM Disk caches ...
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Is it possible to upgrade from centos 6 kernel 2.6.32-754.25.1.el6.x86_64 to 5.12.1 version?

You are currently using centos6 kernel 2.6.32-754.25.1.el6.x86_64. I'd like to upgrade to 5.12.1 to take action against the vulnerability in this version, and I'm asking if it's possible. If it is ...
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Linux Kernel support for ARM Cortex-A78

I am planning to boot Linux for an ARM Cortex A78 based system. And I have some doubts about the same. 1. Which kernel version should I select ? I checked 5.4.112, 5.10.30, 5.11.14, 5.12-rc7 kernels, ...
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Linux system completely freezes “CPU Stuck for 22 seconds”/ Hardware Error?

I have got the issue of regular freezes on my ryzen 5 computer. It occurs across different distibutions and kernels. The freezes occur mostly when trying to suspend the system to ram, but also changes ...
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51 views

High CPU load on SYN flood

When being under SYN flood attack, my CPU reach to 100% in no time by the kernel proccess named ksoftirqd, I tried so many mitigations but none solve the problem. This is my sysctl configurations ...
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Freshly installed Manjaro linux doesn't show up wifi

I just installed Manjaro on my dell latitude 7389. Wifi worked just fine right after I installed. but after I did a full upgrade with "pacman -Syu" wifi stopped working. ethernet and ...
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Unplugging my webcam slows down linux and is impossible to shut down the computer

When I unplug my webcam my computer starts to slow down, programs don't close nicely (I have to force it in the system monitor) and the lights of my keyboard (Num lock, capslock, etc) don't change ...
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During Vagrant provisioning, the system stalls

During my Vagrant Up process, many tasks run in succession and all does work, however at the end I have a validation test that stalls. The only way I can end the stall is logging into the machine ...
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Is there any way to have my laptop run Windows 10 while having a KVM-Hypervisor under it?

Before I start, I should let you know that my knowledge I have gained so far consists of self-study, so I might not get the correct terminology. I use Windows 10 for all of my productivity work, but I ...
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Extract linux kernel from uImage for qemu use

I have the uImage file, boot-args and boot log of an embedded cortex-a9 device. When I specify the -kernel uImage qemu just hangs. The uboot tools say the kernel is uncompressed. What is the proper ...
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Linux kernel cmdline “vt.cur_default” explained

I like my console cursor to be a nonblinking white block. Call me crazy ;) I am using the Linux kernel cmdline parameter "vt.cur_default=0x700711". This works fine, for example, on my ...
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1answer
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Downloading Terraform onto linux OCI VM

I am currently trying to play around with some tf scripting in an OCI compartment I have access to. My current position is: I have successfully spun up a VM through the OCI console running Linux 8 on ...
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enable zswap selectively per-device?

Is it possible to enable zswap for some swap devices but not for others? I don't see any tunables, and quick checks show that even zram swaps end up using zswap (leading to double compression). Once /...
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Compiling Linux creates corrupted object files

I'm trying to update my current system to Linux 5.4.85. I have two toolchains that support compiling this kernel: gcc 4.6.3 and gcc 10.2.1. The compilation fails with both. I downloaded and extracted ...
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How to accurately throttle network interface with tc in linux

I am sending UDP packets from a Linux server over a dedicated network link (unswitched point-to-point 10GbE connection) to a piece of custom hardware. The hardware is an FPGA with a very limited ...
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How to fix nvidia-current not found after modprobe?

I'm using Debian 10 (Buster) with a NVidia GT630 graphics card on a i386 system. apt install nvidia-driver installed nvidia-legacy-390xx drivers. Unfortunately the kernel module doesn't load (output ...
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What causes sound and animation stutter when Linux slab allocations are under heavy pressure?

I noticed that when doing heavy disk operations the sound from Youtube videos and games, and the gnome-shell Wayland compositor animations would stutter. It seemed to come and go. My Ubuntu 20.04 ...
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Thinkpad X1C8 Linux Kernel errors related with ACPI

im using manjaro linux in my thinkpad x1 carbon gen8, and when i type journalctl to check if i have any errors i find this Oct 30 21:12:30 lgtegetege kernel: ACPI Error: Needed [Integer/String/Buffer]...
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Kernel Panic: How to solve the linux kernel panic for unable to mount root fs on unknown-block(0,0)?

How to solve the linux kernel panic for unable to mount root fs on unknown-block(0,0)? Here is the debug info(sorry for no embed image cause i have no enough reputations): My plan is this: build a ...
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246 views

Unable to login after switching to “multi-user” target in Yocto Linux

I have a device running yocto(warrior) and selinux is enabled by default. I am unable to login to device if I switch to multi-user target. If I change selinux in permissive mode, I am able to login ...
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Full-text searching, how fast one can find “Linus Torvalds” into the linux kernel? [closed]

Three things: Currently, what are the fastest full-text search tools? Are there full-text search tools capable of reporting fullpaths of files containing hit(s), FAST? Is Linus Torvalds right about ...
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144 views

Black screen without any text, after upgrading Ubuntu 18.04 to 20.04

After i upgrated my ubuntu to 20.04, while booting, the black screen has been shown. i have Nvidia GC. (Secure boot and fast boot is disabled). i tried nomodeset, runlevel 1, removing quiet and splash ...
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304 views

How to stop linux watchdog feeding?

I'm making a daemon that feeds the watchdog (by writing to /dev/watchdog), but when the code stops writing, I expected the machine to reboot, but it didn't. I though that maybe something else is ...
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25 views

“modprobe snd-aloop” stops working on Ubuntu after VM suspends

In order to get Fortinet FortiFone working on an Ubuntu client (student lab environment), I set up Wo Mic. It was really easy to set up chmod +x micclient-x86_64.AppImage Followed by this sudo ...
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Can't change ubuntu linux kernel

In server default kernel is 2.6.32-042stab141.3 I want to upgrade to 3 or higher I tried these steps wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11.2/linux-headers-4.11.2-041102_4.11.2-...
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why do i see the message “do_IRQ: 5.33 No irq handler for vector” on my dell xps 15 9550?

Every time I suspend/unsuspend my laptop (Dell XPS 15 9550) I see this kernel log: Message from syslogd@cruz-XPS-15-9550 at Sep 14 07:58:31 ... kernel:[ 725.565407] do_IRQ: 5.33 No irq handler for ...
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How to load the TIPC Kernel module in Centos7 - 3.10 kernel

I have a problem with a server that it is running Centos7 with the kernel 3.10.0-1127.18.2.el7.x86_64. I was installing a POD of the k8s that we had in this Bare Metal, but one of the PODs says: ...
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55 views

Is there a way to move a frame directly to userspace?

When receiving an Ethernet frame,It goes kernel protocol stack(TCP/IP) first,after,it goes to userspace.... I want to implement userspace stack...My operating system is Linux(Ubuntu/Parrot sec)....Is ...
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How to list all NUMA zones in crash?

To list all md devices in a vmcore using crash, we can use the command: crash> list mddev.all_mddevs -H all_mddevs ffff8806bf697800 ffff8807abba7000 ffff8806d2b5f800 ffff8800b7830800 ...
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Fix CPU overheating after Sleep | Linux

I have: Linux mx18 4.19.0-5-amd64 #1 SMP Debian 4.19.37-2~mx17+1 (2019-05-15) x86_64 GNU/Linux The output of the lscpu command: Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit ...
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Missing firmware for module amdgpu

After I updated and upgraded Kali Linux now I can't boot from the latest Linux update. VFS:unable to mount root fs on unknown-block(0 0) While updating and upgrading Kali Linux: sudo apt install git -...
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PCIE as PERSISTANT Memory

Is it possible to make(emulate) PCIe device as PMEM device?? Is so how. Is there any example driver for that https://www.kernel.org/doc/Documentation/nvdimm/nvdimm.txt
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Using pacstrap to install a package from AUR

I want to setup linux-rt kernel (available as an AUR package) using pacstrap in a bash script. Is it possible and what's the most straightforward way to do that?
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1answer
833 views

How does WSL[2] pose limitations on a guest linux system?

As soon as I got WSL2 on my Windows PC, I installed an adapted CentOS 8.2 version. As I explored it, I found that I could read and write in the host's NTFS file system out of the box. It was also ...
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Does using different kernel versions (dual boot) containing different versions of btrfs with the same btrfs filesystem cause problems?

Didn't find any answer in the official wiki: https://btrfs.wiki.kernel.org/index.php/FAQ Why would I want to do that? I want to try another distro along side my currently installed distro. Where's the ...
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1answer
87 views

I cannot find headers for linux kernel 5.3.10-arch1-1

I am trying to modify a live arch linux distro to include some proprietary drivers, but I can't seem to find kernel headers for it. I am trying to compile the bcwc-pcie package for facetime HD cameras....
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Recommended defconfig options for normal use

I have chrooted Debian on a router arm. Now, a lot of packages I try require kernel options that have not been enabled. Obviously I have the firmware source code and the ability to recompile the ...
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1answer
685 views

Removing old DKMS files fails due to new kernel

I am running Ubuntu 19.10 and due to some problems with the linux kernel 5.3 i switched to 5.4. Now if i want to remove old virtualbox dkms files (virtualbox-6.0.14), dpkg exits with error code 10. ...
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Where is the Magic SysRq key on the ASUS P50IJ?

The title is the question. Up to now, I was unable to find it. The proposed solutions I could find on Wikipedia, Wikibooks, superuser.com are not working for me. I have not found any information ...
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102 views

How to enable ECN marking in IP header in Linux?

Is the ECN marking in the IP header is performed by default in Ubuntu (4.15.x kernel) or should the kernel be recompiled with a special option? I configured a RED ingress queue at an Ubuntu machine, ...
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33 views

Ethernet Card Drivers in Linux-Libre kernel

I recently installed both Hyperbola and Arch and became thorough with installation process. Didn't like them. Installed parabola linux. When I finally boot into my fresh install, ip link doesn't ...
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40 views

Unable to boot 64-bit kernel after installation

My system supports 64-bit architecture and I am able to use debian-buster meant for amd64 architecture separately. Now, I have an os running debian-buster having kernel as "linux-image-686-pae". I ...
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191 views

New AMD system randomly crashes / kernel panics

About a year ago, I acquired a threadripper based desktop computer, the hardware details of which are: Samsung 970 EVO Plus 500GB - Solid state drive ASRock X399M TAICHI (latest firmware) Gigabyte ...
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155 views

systemd: Freezing execution in Yocto

We have a legacy device with following configurations: Chipset Architecture : Intel NM10 express OS : Yocto warrior CPU : Atom D2250 Dual Core Volatile Memory : 2GB DDR3 CPU core : 4 I have ...
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270 views

5 GHz AP Mode with Atheros QCA6174A chipset on centOS8

I am trying to set up an 5 GHz access point on a machine with an Atheros QCA6174A-equipped WiFi card running centOS8. However, all 5 GHz bands are blocked (no-ir flag set) for operation in AP mode (...
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1answer
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Difference between dpkg and kernel architecture?

I was going through one of the servers and I found a very interesting thing while installing .deb package using Debian. When I am doing uname -a, I get the following output: Linux ip-10-20-1-20 4.15....

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