Questions tagged [kernel]

The main component of most operating systems, the kernel manages most of a computer's communication between hardware and software. Typically, the kernel is the lowest level of abstraction a programmer can have to a resource.

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Reading and writing to pcie memories of endpoint devices when that memory is prefetchable

So, my problem is that I cannot read or write to prefetchable memories that are opened to me for pcie. I have two different setups: 1 - I have a linux kernel 4.9 root complex device, and also a 4.9 ...
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LSPCON detection error

I would appreciate any help regarding a LSPCON detection problem I am dealing with. A notebook (Lenovo IdeaPad S340) has i3-8145U and only integrated graphics Intel UHD 620 with HDMI output. Each of ...
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Fedora: Removing broken kernels from boot menu

I have a dual-boot (Fedora / Windows 10) Dell laptop. Nearly as often as not, when I run a dnf update I get a broken kernel (at least as far as my laptop is concerned). What I mean by "broken" is ...
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I'm unable to enumerate prefetchable endpoint devices behind a pci-e bridge

Here is my problem: I'm unable to get BAR addressing from prefetchable end-point devices behind a pci-e bridge. Can anyone help me about that? Here is what I did until now: 1- I'm able to get ...
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Toshiba Satellite C855D-S5320 Kernel Panic after installing Fedora 31

I am using Fedora 31 as an operating system and I am beginner. Yesterday I installed an update package which I can not remember after completing the installation the system stopped and I get a ...
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Package manager (pacman) not showing linux-headers for current kernel version

I'm using Manjaro 20.0.1 with 5.6.11-1 kernel. uname -a: 5.6.11-1-MANJARO I've updated the pacman database with sudo pacman -Syy. But if I try to install the linux headers, the latest ones ...
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rhel + Device xxxx has different MAC address than expected

in messages file we have the following error ERROR : [/etc/sysconfig/network-scripts/ifup-eth] Device papa2 has different MAC address than expected, ignoring. is it minor alert , and we should ...
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rcu_sched detected stalls on CPUs/tasks

I'm running many VMs using Virtualbox. These VMs use Debian 10.3 (the latest version). And I'm experiencing bugs / freezes as you can see below. It looks like this is happening on the VMs where I ...
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Initramfs Unpacking Failed

I am using VMware 15.x on my Windows 10 machine to boot into Kali 2018.3a. I messed around it and I have come to this error. So every time I power on to my VM, this screen appears: What I have tried ...
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How to change kernel security level?

My Mac had a kernel security level of 0. Then, I changed the kernel security level to 1. Here's how I changed it to 1: sysctl kern.securelevel=1 I'd like to change it back to 0 because my hosts file ...
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kernel missing nf_tables_inet module in Solus

the title says it all. Solus Linux kernels are missing numerous kernel modules essential to successfully operating nftables! why is it even a pkg in the eopkg repos if they don't compile their kernels ...
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dmesg + UDP: bad checksum. + rhel 7.x

from the dmesg we get very strange lines as [6484420.812643] raid6: using avx2x2 recovery algorithm [6484420.859086] Btrfs loaded [6484426.278636] nr_pdflush_threads exported in /proc is scheduled ...
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Using WinDbg to “break into” a badly hung kernel crash and see what's gone on?

I am testing the limits of overclocking on my PC, using classic stress tests such as Prime95 with WinDbg to identify when processes fail, the core they were running on (which is pushed too hard and ...
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Cannot find vmlinux when I try to enable KVM on WSL2 on Windows 10

I would like to enable the KVM support on my WSL2 on Windows 10 64 bit. I'm trying to do that by following this tutorial : https://gist.github.com/offlinehacker/b1d96515f87a47bd0b0bea574eab5583 When ...
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Endless “mce: [Hardware Error]: Machine check events logged” after kernel 5.5.15-200.fc31 update

I just recently encountered a problem with my Fedora 31 installation: I updated my system as usually, this time to kernel kernel 5.5.15-200.fc31, but ran into my first problem my Atheros AR9485 ...
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how do I report a kernel bug to linux developers mailing list?

I have a problem (bug) with linux kernel , specifically bcm6xx usb code on bcm6318 cpu. how do I post this to linux-usb mailing list? I have no experience with mailing lists
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Perf top reports symbol “__cpuidle_text_start” consuming 87% CPU time

I have powersave (C-states) disabled in BIOS and in the kernel config, however, CONFIG_CPU_IDLE is enabled, and related "__cpuidle_text_start" takes too much CPU time, while I am not really sure what ...
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/boot partition full on Fedora

when I start system, I get an error message that /boot is full, also when I try dnf upgrade, I get a Transaction test error that says that kernel-core-5.5.10-200.fc31.x86_64 needs 38 MB in /boot. I ...
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312 views

Disable dedicated GPU device in GRUB

I need some help. :( My laptop has Ryzen 5 2500u with Vega 8 graphics card and a dedicated gpu RX560x. The OS is Linux Mint Tricia Cinnamon based on Ubuntu 18.04 LTS. My dedicated gpu is momentarily ...
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Guest additionals: Kernel headers not found for target kernel

I've been having a difficult time getting Guest Additions to install on my Oracle Linux 7. I have VirtualBox version 6.1.4. I have guest additions version 6.0.4 The machine had 4.14.35-1902.7.3.1 ...
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Kernel space in a process virtual memory map is reserved by all processes?

I recently run into this question regarding the kernel address space as part of a process virtual memory map. While I understand that this space is reserved by the kernel on behalf of processes and ...
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No kernel messages are logged in kern.log

I see that the kern.log file doesn't show any message. I did put the iptables log in kern.log this way: sudo iptables -A INPUT Until yesterday, this command was working, but today I needed to add ...
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How to get hardware memory location of the Ethernet interface

When I type ifconfig eth1 I get this output: eth1 Link encap:Ethernet HWaddr 00:04:9F:05:3E:4A BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 ...
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Realtek ALC3204 soundcard does not work in arch Linux

I’m running arch linux on an dell inspiron with a realtek ALC3204 soundcard. It’s not recognised by the os. I tired to install some additional drivers what didn’t help, I serched the whole internet ...
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rEFInd: Kernel Parameters in /boot/EFI/bootx64/refind.conf not appying

I've never been able to set kernel parameters on my device, even when I was using grub. I've run out of idea's as I've added them to udev as well and used sysctl but nothing seems to work. ~My rEFInd....
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Proxmox System freezes after 30-40 minutes running, no containers/VMs running

I am having some problems with a new-to-me used Xeon E3-1225 server I'm trying to turn into home server. Currently, I have it setup with Proxmox installed, two 1TB hard drives (different makes/models)...
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On Manjaro i3 linux316.Virtualbox kernel module not loaded. File /sbin/vboxconfig does not exist

I'm running Manjaro i3 with linux316 3.16.81-1. Upon sudo pacman -S virtualbox, the following were installed: linux316-virtualbox-host-modules-6.1.2-1, sdl-1.2.15-13, virtualbox-6.1.2-1. Upon running ...
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227 views

Realtek Ethernet not working after kernel update

After updating the CentOS 7.7 kernel from 3.10.0-957.27.2 to 3.10.0-1062.9.1, the Ethernet stopped working. The LEDs on the Ethernet port wouldn't light up and any attempt to ping anything resulted in ...
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ELan touchpad not detected

After updating Kali Linux too kernel 5.4 . my touch pad is not detected . my kernel is: Linux sorush 5.4.0-kali2-amd64 #1 SMP Debian 5.4.8-1kali1 (2020-01-06) x86_64 GNU/Linux ic2_h cannot detect ...
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Offline Update Rhel 7.4 without changing the version of OS

I have to Update my Rhel Server and keep the version of OS. The current running version of OS is Rhel 7.4. My server is not connected to internet. So i have to do an offline Update. Is it possible to ...
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Screen going black and OS not booting

Using Manjaro KDE. In an attempt to install nvidia drivers, i blacklisted the nouveau drivers typing "blacklist nouveau" in /etc/modprobe.d/nouveau_blacklist.conf and then rebooted. *Didn't reboot ...
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How to redirect (or tee) early boot messages (and/or dmesg) in real time

I am trying to boot from a usb-hdd, which is supposed later to pass control to a full-fledged Ubuntu 18 installation, on a different HDD. The usb-hdd has only the following directories and files: - ...
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Debian 10 Buster on Cubietruck with bug in sun4i_drm_hdmi

I have a new installation of Debian 10 Buster for ARM (armhf) on a Cubietruck (aka Cubieboard 3, http://cubieboard.org/model/). The base system was installed on 2020-01-04 and is up to date. Note that ...
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Why no HDMI with new kernel?

i use a rock64 board (Rockchip RK3328 Quad-Core SOC with Mali 450MP2). I now have a finished kernel configuration (kernel 5.4.3) for my board and everything works except hdmi :( HDMI doesn't work ...
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will linux tcp purge the pkts in qdisc when do tcp_close?

when call TCP close(), should it purge the packets in Qdisc which has not been sent yet? Sorry, I can't find how to do this purge?
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Kernel core collection is not working in Centos. How do I troubleshoot it?

I have a problem with CentOS7 not generating kernel cores after installing new kernel: When I go through the settings right after a fresh CentOS install and trigger a kernel panic, I do get a kernel ...
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801 views

Too many kernels installed, no space left on /boot, unable to purge old kernels

I'm receiving out of space errors when attempting to install updates on my Linux Mint 18 system. /boot is showing 100% full. I noticed that I have a slew of old kernels that need to be removed. I ...
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What are these bugs when dual-booting windows with deepin OS?

So I'm dual booting windows 10 with Deepin OS but I keep running into errors that I can't find solutions to because I can't figure out what's wrong. I've followed multiple tutorials, doing everything ...
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392 views

Ubuntu server hardisk read-only Detected IO errors while flushing file data on sdc-8

I am having a server running Ubuntu 16.04 with some data writing on external hardisk. Suddenly the server stops working on Nov 6 and when I restart the server it start working without problem, I got ...
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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//...
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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 ...
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Centos Kernel compilation: systemd fails to start udev

For my Centos 7.7 VM, I compiled kernel version 4.4 to just see how it works. I downloaded the kernel code from this site https://www.kernel.org/ And followed the procedure that I found here : https:/...
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Kernel Error with Anaconda Jupyter On Windows 10 Pro 64 bit/Dell Optiplex/Intel Core i5 8500T

I have been looking on git/S.O., google, Dell, Microsoft, and other sites to try and fix this issue for weeks!!! I am able to load Jupyter Notebook and Lab but I keep getting the kernel error similar ...
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Jupyter Kernel Error

Red Kernel error at the top right. Just updated to Mac OS Catalina and I'm using Safari browser. Traceback (most recent call last): File "/usr/local/Caskroom/miniconda/base/lib/python3.7/site-...
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Kernel Panic with every Linux Distro on my MacBook

I recently bought a 2018 MacBook Pro for iOS development and I'm trying to install Mint/Ubuntu/Debian in a second partition I made before. The problem is that I keep getting the same error every time ...
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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 ...
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168 views

Compile kernel module with static library (.a)

Welcome. I have such a problem, maybe sheet metal but unfortunately I can't deal with it. I have probably searched the whole Internet but unfortunately I have not found a solution to my problem. ...
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Init process(PID 1) has no outputs after I changed the rootfs format from jffs2 to ramfs

This is what I want to do originally: my rootfs located in NAND flash with jffs2 format, I want to use ramfs instead. So I, 1.create a cpio ramfs rootfs. find . | cpio --quiet -H newc -o | gzip -9 -...
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Kernel panic not handled correctly, system freezes forever instead of reboot

Im trying to setup kdump right, so that it will trigger on a kernel panic that i trigger manually by echo "c" | sudo tee -a /proc/sysrq-trigger. Every time i trigger it the system will just freeze ...
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71 views

Squashfs corrupted data

I've created a squashfs from a small rootfs directory for emebedded devices: mksquashfs rootfs_image rootfs.squashfs -b 1024k -comp xz -Xbcj x86 I've successfully copied this squashfs into the ...

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