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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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Bluetooth Dongle not working

I buy a new LogiLink BT0015 USB Bluetooth dongle and want to install it on my Debian 9 system. After the installation process (bluetooth, bluez, blueman package), the dongle not working and the device ...
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Converting Linux driver for SPI device to run on USB-to-SPI bridge

I have a Holt HI-3110 chip that implements a CAN bus interface that is run over an SPI host interface. A driver for the chip is in the Linux mainline (in /drivers/net/can/spi). I'm targeting a host ...
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update-initramfs -u fails after installing new kernel

I compiled and installed a new kernel, 4.19.10 following this guide. https://www.cyberciti.biz/tips/compiling-linux-kernel-26.html I had done the same in the past without any issues but this time ...
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How to choose optimized Linux-ck kernel?

I have a question that are all 14nm intel cpu use the same micro architecture? E.g (sky lake, kaby lake, coffee lake, whisky lake). PS: Linux-ck repo only have sky lake version , which is the first ...
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Understanding OOM killer reason on openwrt system

This is a busybox/openwrt system. OOM-killer are intermittently killing processes. Sometimes collectd, sometimes snmpd and as in example below uhttpd. I could aproximately free up 37% by not ...
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77 views

How to isolate a drive?

Question At Linux boot, is there an option I can add to the “vmlinuz…” line that will prevent the OS from ever (at least in that session) being able to see or access NVMe SSDs - while keeping all ...
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implementation of 802.1x authenticator in linux

we are planning to add 802.1x port-based authentication support in our networking based product(router) but we are confused that how to implement it in software.We are using switch which is having ...
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Understanding Minstrel's rc_stats file in Linux (WiFi bitrate adaptation algorithm)

Problem: The statistics used by minstrel_ht - Linux's typical WiFi bitrate adaptation algorithm - are published in the file /sys/kernel/debug/ieee80211/phy*/*/stations/*/rc_stats. This file has a ...
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35 views

Installing new version of linux on vary old

I have a compact version of linux, build from ubuntu V10 and kernel v3.13. Now because of hardware changes, i need to replace it by newest kernel. When I try to update in directly, after downloading ...
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Replacing linux kernel from outside of system

There is a certain ubuntu image that works (from the SD card) with a hardware controller. The whole image takes 2 gigabytes, for such is the card size. The image is built on the old kernel. We need to ...
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Can QEMU boot Linux from vmlinux instead of bzImage?

I've been using QEMU 3.0.0 happily with -kernel bzImage from Linux v4.19. However, now I have another simulator (gem5) that boots from vmlinux, it would be convenient if I could boot both from the ...
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Are newer `btrfs-progs` versions safe to use with older kernels?

For example btrfs-progs-4.17 on kernel 4.14 - any issues, or can just upgrade btrfs-progs with no "back-compatibility" concerns?
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Installing Virtual Box on Solus: Linux kernel header files

I have a problem with installing the VirtualBox on Linux Solus. When I try to start it it gives me this error-message: This system is currently not set up to build kernel modules. Please install the ...
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1answer
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i2cdetect -l don't return anything

I need to use the SMBus, but when I run the command i2cdetect -l I do not receive anything as output, on Windows it was recognized, I do not see anything about SMBus even doing lspci. I installed and ...
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Installation of particular kernel version

I am certainly new to this, however, I am working on a project and that needs a particular version of Kernel. I am not sure how to get it. I am planning to spin up a VM for that version, however, not ...
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Is there any keycode available to perform Field Exit in VT220 , VT320 Terminal?

Basically i need to move cursor from one input field to another field without hitting enter. How should i do it in the terminal ? For example i found keys like : TabKey[0] = "\u0009"; TabKey[1] = "\...
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no RT patch for linux kernel 3.19 version available - use next closest one, namely version 3.18 or 3.2?

Hy community, I use a 3.19.5 Linux Kernel for my target-board. Now I want to make it real-time capable with the RT_PREEMPT patch. But the 3.19-series is not avaiable under https://mirrors.edge....
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Why is my custom centos kernel not booting? No source changes were made

I followed this guide to rebuild my 3.10.0-327 kernel (CentOS 7.2): https://wiki.centos.org/HowTos/Custom_Kernel I will be making changes to it, but even if I make no source changes, it does not boot ...
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Cannot find inux-headers-4.9.0-kali3-amd64

I want install a virtual box on Kali linux and I get a error message : This system is currently not set up to build kernel modules. Please install the Linux kernel "header" files matching the ...
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279 views

Not able to install curl-devel package on CentOS 7

I run CentOS 7.3 as production server. I executed following commands in sequence ... But not able to install the curl-devel package. $ yum clean all $ yum update $ yum install curl-devel Loaded ...
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Installation of eclipse in linux fedora27 version

i try to install the eclipse eclipse-cpp-oxygen-3a-linux-gtk-x86_64.tar.gz file and create the eclipse executable at given path using the touch commands touch /usr/bin/eclipse and also change the ...
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111 views

What is the meaning of HID quirks that linux kernel uses?

As the title suggests I would like to know if the actual meaning of the HID quirks used in the linux kernel is documented somewhere. Some are pretty self-explanatory (e.g. HID_QUIRK_ALWAYS_POLL, ...
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Linux logs are polluted by kernel “vfs-change discarded” messages

today I noticed those lines appearing in my dmesg command output: May 29 20:00:32 PC kernel: vfs-change discarded[75]: 1527614896 file-deleted, /etc/.#grouptKnxCp, (null) May 29 20:00:32 PC kernel: ...
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Kernel Compilation: Force all modules to be baked in

I am building a kernel with OpenWrt for a hardware device. As there will no new pluggable hardware which will be added later, I want to make sure that all kernel modules are built into the kernel. ...
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63 views

excessively print the kernel log bnx2x: [bnx2x_get_regs:987(eth2)]Generating register dump. Might trigger harmless GRC timeouts

My server print the log about "bnx2x: [bnx2x_get_regs:987(eth*)]Generating register dump. Might trigger harmless GRC timeouts" every hour. It has started today and continues print the log every hour. ...
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usbip: automatically pass keyboard between computers

I have a wireless usb keyboard which I would like to use at two computers without constantly shifting the receiver. Possible solution: usbip. However, some problems: Why does usbip unbind not allow ...
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1answer
706 views

Package: “xorgxrdp” install failed! [Webmin]

What should I do to fix this on Webmin (web-based system configuration tool for Linux)? Resolving Dependencies --> Running transaction check ---> Package xorgxrdp.x8664 0:0.2.6-1.el7 will be ...
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vmlinuz is missing from my system, how to fix it?

All Linux should come with vmlinuz under "/", and "/boot/" as well. However, my system doesn't have it: % ls -l /vmlinuz* /initrd* /boot/vmlinuz* ls: cannot access '/vmlinuz*': No such file or ...
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148 views

Fedora 26 hangs on reboot

I'm using fedora 26 and i keep getting these weird hangs on reboot, they are not consistent (I can reboot 20 times and it would work fine, and reboot 20 times again and it will hang). The last ...
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Does perf work on Red Hat 6.7?

My company is stuck on Red Hat Enterprise Linux 6.7. Running perf record ls as non-root results in an error: "Perf session creation failed." $ cat /proc/sys/kernel/perf_event_paranoid 1 $ uname -r 2....
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how to enable MSI-X support for NIC?

I want to utilize the MSI-X functionality of my NIC but its not getting enabled. As you can see below, MSI-X capability is there but disabled. How to enable this? # lspci -v 00:00.0 PCI bridge: ...
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Linux GRUB Error: 'no such device: < uuid >

The error shown in appears when I boot a Virtual Machine using a .VHD (converted from .RAW) migrated from a different place (public cloud) I followed some steps from https://askubuntu.com/a/...
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configure: error: Package requirements (vte-2.91 >= 0.40) were not met: Installing tilda terminal on opensuse

I', trying to install tilda terminal on opensuse 42.3. I'm following instruction from this here. when I tried install required packages vte-3 is not available. I have given below the command output. ...
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Scancodes of Fn keys

I have a problem with remapping Fn keys on my Dell xps 9370. Software: Arch linux + Wayland. I want to remap brightness up/down keys to page up/down, but i cannot find their scancodes. This is output ...
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225 views

drm:drm_atomic_helper_commit_cleanup_done in syslog, laptop freezes, chromium freezes

My lenovo laptop running Debian sometimes spontaneously freezes, and now chrome is unusable (freezes, its window cannot be raised in the WM) Mar 25 15:33:40 debian-x1 kernel: [43100.329237] ----------...
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Linux VM hanged after CommVault Backup

The last messages in /var/log/message before I had to restart the linux-server was: Mar 4 20:48:24 extranet2 kernel: Mem-Info: Mar 4 20:48:24 extranet2 kernel: active_anon:8 inactive_anon:0 ...
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Is there an advantage to block level based vs file based software updates [closed]

I see that there are these two ways to do software updates. Regular linux does file based updates but Android shifted to block based updates. Is there an advantage to this? How does a block level ...
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1k views

Is it safe to enable user namespaces in CentOS 7.4 and how to do it?

I am trying to use Brave Browser on my CentOS machine, but when I try running it, it gives me the following error. [19576:19576:0208/180128.818448:FATAL:zygote_host_impl_linux.cc(126)] No usable ...
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how a virtual address is mapped to address on the swap device during paging

During page-in, how the OS know where to find the page (corresponding to the virtual address accessed by the user process) on the swap device to move in? when a physical page needs to be paged out, ...
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745 views

Grub/Ubuntu: Couldn't find suitable memory target after kernel upgrade

Shortly after the new kernel versions were released for the Spectre and Meltdown issues (perhaps unrelated) I installed the latest kernel update, which at the time was 4.13.0-25.29. As soon as I ...
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Need to build older linux kernel (2.4) from source and reflect the same in existing grub config

I need help in setting up my machine as below in various partitions: (Dell precision, 64 bit laptop) 1)Centos 64 bit latest, this would be my main working partition and OS 2)Ubuntu 14.04.1 LTS 32 ...
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Is ifconfig an absolute path or relative path? [duplicate]

When we enter ifconfig in terminal, it works as per the need. if we enter /sbin/ifconfig in the terminal again, it works again as the same. Then , Is ifconfig an absolute path or relative path?
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keyboard input not working in linux login?

i recently upgraded my parrot security OS from 3.7 to 3.11. The problem is when i boot into it, the os is not detecting keyboard inputs. Hence i cannot enter my password at login and access the system....
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757 views

What is “modloop” option in Alpine?

I'm trying to understand what is the difference of making Alpine installation medium as read-only type (LiveCD) and as a standard disk mode (where the OS state can be saved). I've seen the modloop ...
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how to update godaddy Dedicated linux server centos 6.9 kernel

I have dedicated server from godaddy. The Linux information is as follows. Version: CentOS release 6.9 (Final) Kernel: 2.6.32-042stab111.11 I have executed "yum update" on server and now /boot shows ...
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Replacing custom bootloader with GRUB

Context: I have a rooted device, one board Linux with busybox binary, and I would like to install new packages on it. Unfortunately busybox doesn't provide utilities for that, apart from rpm. To add ...
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108 views

Conntrack doesn't show packets and bytes

I am trying to use conntrack, on Centos 7 (kernel: 3.10.0-693.el7.x86_64) to monitor TCP connections with this command: conntrack -L Which seems to work fine: tcp 6 299 ESTABLISHED src=10....
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114 views

Cannot create Security Association in CentOS 7.4 using Setkey

I've been asked to migrate from CentOS 6.8 to 7.4 on all of our Linux devices. I'm running into an issue with loading Security Associations into the Linux kernel. I'm using ipsec-tools' ...
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7k views

How to Turn Off KPTI to Improve Performance in Fedora

Following the outbreak of KPTI news, I recently updated my kernel to 4.14.11-300. In addition to a quite sufficient RAM (8 GB) and fast IO (SSD disk), I have started to feel remarkable slowdown in my ...
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Dynamic or virtual file content, similar to /sys/*

Imagine you wanted a file - for example /etc/hosts - but every time the file was read, rather than reading it from the filesystem, its contents were the output of an application - for example a script ...