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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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 ...
dosensuppe's user avatar
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499 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 ...
iTaMaR's user avatar
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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 ...
M MO's user avatar
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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 /...
usretc's user avatar
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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 ...
Michael K's user avatar
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7k views

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 ...
lmoly's user avatar
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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 ...
Raxesh Oriya's user avatar
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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 ...
Georgi's user avatar
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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 ...
Niros's user avatar
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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-...
Azat's user avatar
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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 ...
morhook's user avatar
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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 ...
Janith's user avatar
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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 ...
ADAM10's user avatar
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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 -...
bob's user avatar
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5 votes
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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 ...
Katerl3s's user avatar
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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 ...
hedgehog's user avatar
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1 answer
390 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....
Zachary Schroeder's user avatar
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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 ...
J. Doe's user avatar
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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. ...
Max404's user avatar
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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 ...
Claude Frantz's user avatar
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514 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, ...
v1mm3r's user avatar
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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 ...
sagar_acharya's user avatar
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185 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 ...
snpd's user avatar
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3 votes
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504 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 ...
Ashesh's user avatar
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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 ...
Raxesh Oriya's user avatar
3 votes
0 answers
770 views

5 GHz AP Mode with Atheros QCA6174A chipset on CentOS 8

I am trying to set up an 5 GHz access point on a machine with an Atheros QCA6174A-equipped Wi-Fi card running CentOS 8. However, all 5 GHz bands are blocked (no-IR flag set) for operation in AP mode (...
EMC's user avatar
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1 answer
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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....
Rajat Gupta's user avatar
1 vote
2 answers
2k views

Why is there nothing in my conntrack's output?

I have a simple bench: Linux machine with nf_conntrack module loaded. This machine is between two other hosts (A and B), so it routes traffic between two networks. When I send ping from A to B through ...
NK-cell's user avatar
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1 vote
1 answer
80 views

Self Authenticating Usb

Is it possible put a script on a usb that it only allows the contents of a folder to be discovered (or even whole usb to be undiscoverable), unless certain requirements are met? For example; If I ...
Exosylver's user avatar
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1 answer
294 views

error while booting custom minimal linux distribution: unable to mount root fs

Recently I followed along an article describing how to build your own minimal linux distribution (Linuxjournal article) After many tries I finally came to the point where I put my OS on a USB drive. ...
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Regular audio glitches on Linux with Scarlett 3rd gen USB interface

I have a Scarlett 18i20 audio interface running well on a Samsung laptop with Linux Mint 19.3 Tricia and with the 5.0.21-rt16 real time kernel with fully preemptive configuration. The same set up on ...
sebinho's user avatar
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2 votes
3 answers
2k views

How to use hwsim, "Module mac80211_hwsim not found in directory" error

I have tried using this guide: https://wireless.wiki.kernel.org/en/users/drivers/mac80211_hwsim and did modprobe mac80211_hwsim However the output is: modprobe: FATAL: Module mac80211_hwsim not ...
money-for-nothing's user avatar
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0 answers
151 views

running an existing system based on i686 Centos 6 on a 64 bit architecture

I want to run an old Centos 6 based program (i686) on my Core i5 CPU but it doesn't seem to work although I have enabled virtualization. It's a pretty complex system with lots of software libraries ...
peterbrown's user avatar
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107 views

Fedora31 kernel is not loading after a recent upgrade

I just installed fedora31 on my Dell Inspiron 5567 and ran dnf upgrade --refresh which ran normally and updated all the packages including kernel core and kernel modules. But after I restarted the ...
geno's user avatar
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1 vote
0 answers
70 views

How to build crash kernel for my new kernel?

I am trying to collect kernel crash core for my own custom kernel. So far, I have not been able to. I see that there is a special 'kdump' kernel associated with the original that came with the distro ...
feeling_lonely's user avatar
1 vote
3 answers
2k views

How do I disable Linux media polling?

I have a USB floppy drive (for reasons, don't ask). When it's plugged into a modern PC with Debian and udev, something is pinging the drive every couple of seconds --- I believe it's looking to see if ...
David Given's user avatar
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1 answer
75 views

how to install kernel module for blk_mq's io schedulers?

I have recently changed single queue to multi queue on my oracle server. This server is oracle linux 6.10 (4.1.12 kernel). I realize there is no any io scheduler for blk_mq alse show the /sys/block//...
arifisik's user avatar
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1 vote
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which io scheduler is recommended when use the blk_mq block layer with oracle database?

I have oracle Linux 6.10 with 4.1.12 kernel. I have recently moved from the legacy block to the blk_mq block. But all SCSI devices have show io scheduler is none. I have researched but I didn't find ...
arifisik's user avatar
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1 vote
0 answers
101 views

Linux Kernel 4.18.0 , 5.0.0 and above and GNOME 3.30.0 and above not loading , why?

I was trying to install KALI Linux 2019.3 on my laptop , it is of Kernel 5.2.9 and GNOME 3.30.2 from a bootable pendrive. This installations were very easy for me before (i.e. while installing Kali ...
Sharath Gowda's user avatar
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0 answers
116 views

How to avoid high cpu usage while reading/writing character device?

I need to write a linux kernel driver for a PCIe device with SRAM. For the first attempt, I've written a driver to access SRAM from PCIe with a character device. Everything works as expected, but ...
fazibear's user avatar
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0 answers
260 views

How to patch Linux Kernel?

What is the command for patching Linux Kernel RHEL 8? I ran a security check on the RHEL 8 machine using OpenScap which gave me a list of CVE-links and a title with Kernel Security. After trying to ...
user17378's user avatar
1 vote
1 answer
3k views

Add kernel-headers to yocto raspberrypi-image

How do I add kernel-headers to the yocto image. I tried adding the below variable in local.conf IMAGE_INSTALL_append = " kernel-dev kernel-devsrc kernel-modules" But I am still unable to see build ...
thesillywhat's user avatar
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0 answers
190 views

Kernel 5.3 on AMD Chipset

currently I use my own compiled Kernel Since some mounth without any big issues, but since the Release 5.3 some physical Servers with AMD Chipset won't boot anymore, my last Kernel Vers. is 5.2.8 ...
DoM1niC's user avatar
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269 views

EC2 instance Amzn2 was down for a month. Kernel panic when starting now

I had this fully functional Amazon Linux 2 instance which I had configured into a mail server. During the summer I shut it down. But nothing more than that. When I try starting it now, it only passes ...
psisis's user avatar
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The bucket size in TC-HTB

I study the behavior of tc-HTB. I did a tc setting like the below. After reading The bucket in tbf, I expect its burst size will be rate / HZ. sudo /sbin/tc qdisc del dev s1-eth1 root sudo /sbin/tc ...
nimdrak's user avatar
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1 answer
199 views

Byte vs bit @ linux TC

I am confused at the usage of 'Byte' and 'bit' when using linux tc linux tc-tbf said it use 'Byte' tbf - Token Bucket Filter Synopsis tc qdisc ... tbf rate rate burst bytes/cell ( ...
nimdrak's user avatar
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1 vote
1 answer
2k views

How does Linux reduce physical memory fragmentation in real-time?

The Linux memory allocator works by mapping pages from physical memory to virtual memory. It can either map a contiguous area or sparse chunks from physical memory, to a contiguous area in virtual ...
Byte Maniak's user avatar
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1 answer
6k views

Unable to Bind NIC to Driver VFIO-PCI

Context I'm attempting to run the packet generator MoonGen, however, it requires me to bind a NIC to the VFIO-PCI driver. Therefore, I must first unbind a NIC from its current driver, then rebind it ...
NolanRudolph's user avatar
1 vote
0 answers
2k views

amd64_edac_mod.ko(Error Detection and Correction driver) not loading with the latest kernel to check RAS

I am trying to enable ECC to confirm RAS feature in ubuntu-18.04 Its GIGABYTE BIOS mode, I have checked ECC option, but it is not present. and details of server is: :~$ lscpu Architecture: ...
Murali's user avatar
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