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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How to fix and prevent VirtualBox Kernel driver not installed

Today I noticed that my VirtualBox VMs no longer start. With messagesThe virtual machine 'CGI' has terminated unexpectedly during startup with exit code 1 (0x1).Result Code:NS_ERROR_FAILURE (...
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24 views

How does reading kernel memory translate into stealing passwords with meltdown vulnerability?

I have basic understanding of OS and I understand the mechanism of the meltdown vulnerability but I need some help to filling in the blank between reading kernel memory and stealing user passwords....
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14 views

What does poll(NULL, 0, timeout) mean? [migrated]

I'm looking at strace output that includes a call to the syscall poll:http://man7.org/linux/man-pages/man2/poll.2.html(This is on a Debian system, I forget kernel version.)I keep seeing calls ...
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Privileged ring concept [on hold]

The privileged ring concept is implemented by intel in its hardware.In Intel's developers manual there are around 15 instructions that need for sure ring 0 to execute .In OS-books and other ...
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26 views

Linux Kernel configuring swapping parameters.

Linux may perform a swap out on the following occasions:By a kernel thread denoted as kswapd that is activated periodically whenever the number of free page frames falls below apredefined ...
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8 views

Stuck on - grub> on opening and not able to load boot menu

Stuck on - grub> on opening and not able to load boot menu. Need some HELP which commands to follow. I tried:grub> ls ( here you should see a list of devices/partitions )now we must find the ...
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14 views

Memory Partitions and Memory frames in Memory Management

So, I was reading about these terms and got confused after reading Frames and Pages.Memory can be divided into fixed or dynamic partition using Base and limit registers which normally face problems ...
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51 views

how to know who start a Linux kernel module

There is a running kernel module (netns_vrf) in my Linux computer, like this:$ lsmod | grep vrfnetns_vrf 8388 0This kernel module is not from Linux distribution, it is from a third ...
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29 views

Which option is correct: [closed]

I had yesterday an exam, one of the exercises was:Which thread is faster in a context switching.a) Kernel thread from the same process.b) Kernel thread from different process.c) User thread ...
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90 views

Sporadically occurring kernel panic

I'm getting kernel panics on a 2013 iMac with the latest OS 10.13 (High Sierra) installed.All the loaded kexts in the log are from Apple.I've determined it's a software problem, as I tried ...
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33 views

What might cause the Windows kernel to leak an EXE handle?

This issue is mostly coming up in the context of software development, but I'm asking it here because it also cropped up with an entirely unrelated program.Essentially, the problem that I'm ...
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77 views

Grub prompt after 'yum update' (CentOS 6.9)

It seems the system can't boot correctly after running a yum update and grub prompt appears. I'm not sure but maybe memory was exhausted in the process. The thing is I don't know what is the real ...
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134 views

Force NetworkManager to restart and reload network drivers without a reboot

I have a recurring issues with NetworkManager and its dependent components that always fail when I don't have time to debug or fix the issue. I'm trying to figure-out how I can aggressively restart ...
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1answer
133 views

How do I list my devices in GRUB?

I am trying to boot my own simple OS kernel using GRUB stage2_eltorito. However, the compiled ISO simply leads to a GRUB prompt. I looked up online, and I saw I need to load my kernel. However, when I ...
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21 views

How do I disable kernel logging using systemd

I am doing some disk forensics on some old cdroms before I throw them away, and ddrescue is generating a lot of i/o errors. I don't want to cause unnecessary wear on my SSD, so I want to disable ...
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31 views

An error (regarding kernel source) has occurred while the installation of NVIDIA Graphics Driver in OpenSUSE Linux

I have just installed the latest version of OpenSUSE Linux Leap,and tried to install NVIDIA Graphics Drive, which is for GTX 1060 3G.But, while the installation, a certain error occurred:Error:...
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30 views

Downgrading Fedora 20 kernel has failed dependencies

I currently have a virtual box Fedora 20 VM that's running kernel 3.19.8-100, however, I need 3.16.6-200. I found the appropriate rpm file but but attempting to install gives Failed dependencies ...
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48 views

Whether TCP performance will be improved if Google BBR enabled on client?

I have recompiled linux kernel and enabled google bbr on my VPS, TCP transfer speed has improved about 3 times as before. But, what will be happened if I enable this feature on my client PC. The TCP ...
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2answers
280 views

What kernel modules are required for FTP related connection to work with iptables?

I am setting up restrictive firewall on my PC, which is running Gentoo with kernel 4.8.17. I want to enable FTP PASSV mode for outgoing connections using this rule:iptables -A OUTPUT -p tcp -m tcp --...
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66 views

Linux kernel without MMU? for MIPS R3000

I would like to compile the kernel for a MIPS R3000 cpu, but with a more recent kernel. μClinux seems to be integrated into the mainline development.Now my question, would it be advisable to first ...
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21 views

How can I find out the load on a specific fc port via dtrace?

How can I find out the load on a specific fc port via dtrace?I need to know the speed of reading and writing + IOPS. I read a lot of documentation but did not find anything useful to this topic, I ...
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1answer
40 views

Why does uname -r differ from manjaro-settings-manager?

I'm trying to install some drivers for my kernel. Thus I need to find out my kernel version.While uname -r returns 4.9.43-1-MANJARO, the manjaro-settings-manager shows Linux 4.9.44-1 as running and ...
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110 views

How to get a pre-release linux kernel to work with SecureBoot (Fedora 26)

I'm running Fedora 26, but to get suspend and resume working, I need to use a Rawhide kernel (4.13.rc-1 or later) (See kernel issue). I've successfully installed the Rawhide kernel (4.13.rc-4) ...
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86 views

Fedora 26 strange calendar/date and SELinux bahaviour after Kernel update

Yesterday I've installed all of the latest official updates for Fedora 26 64-bit Workstation, including 4.12 Kernel update.After the system restart, SELinux is reporting following problems:The ...
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111 views

kernel_task consuming 300% cpu when on macbook not sleeping

I'm using a mid-2013 Macbook Air and it's been shutting down unxpectedly & to fix that I reset it's PRAM which worked and it ran smoothly for 1 hour. Then I put it to clamshell mode and returned ...
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27 views

How to have access control for all users, including root, for R/W regular files, in Linux kernels newer than 2.6.35?

I have a Linux Security Module (LSM) on RedHat ES 5, kernel 2.6.18. The LSM implements access control for all users, including root, when they Read/Write regular files.I'd like to implement the same ...
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105 views

Linux FTDI serial driver

I'm experiencing an annoying problem with FTDI serial devices on Linux and it has been observed on several machines and with different distributions. The issue is that the serial adapter misses ...
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72 views

Failed to load TUN module

I try to run OpenVPN in some device with Linux Embedded.Finding OS and release version:/mnt/flash/etc# cat *release*ID=axisNAME=Axis (based on Poky from the Yocto Project)VERSION=6.15.4 (dizzy)...
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603 views

RTNETLINK answers: Operation not supported

I am trying to create network and to add hosts with mininet but I got the error:sudo mn[sudo] password for udooer:*** Creating network*** Adding controller*** Adding hosts:h1 h2*** Adding ...
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51 views

how to fix linux kernel bugs without upgrading kernel?

i am installing hostapd in CentOS6.7 with two methods:1) via rpm command using hostapd-2.0-7.el6.x86_64.rpm2) by compiling tar.gz file following this tutorialin both cases after editing hostapd....
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69 views

Reading version from vmlinuz using file command

As the title says: How to read vmlinuz version (directly) using file command? Using: file /vmlinuz | grep version,It must show like this 4.11.0-9.1-liquorix-amd64.
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does linux-macbook kernel work for iMac?

I use Arch linux on my iMac16,2 1.0. https://wiki.archlinux.org/index.php/Mac#Suspend_.26_Power_Off_.2811.2C4.2B.29 as this page says, I can't shutdown or/and suspend my computer. It reboots ...
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91 views

Is an USB Link Cable (USB2USB) usable for kernel debugging in Linux

I've never before used any USB-Link Cable for debugging the Linux Kernel, now my question:Are these Cables (except the USB-2-Serial) usable for Linux Kernel debugging. I've had some problems to ...
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36 views

Is there a default conf file to build a kernel for pxe booting

Summary:I am trying to build a kernel to pxe boot Clonezilla. I think the one that comes with the live CD has issues pxe booting.So I need to build a kernel and so far all my attempts have ended ...
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931 views

Reason for kernel panic? Unable to handle kernel paging request at virtual address ebfeb0a0

This is regarding imx6q, 2GB Alliance Memory (4Gb x 4, 4 RAM chips) custom hardware design which is most similar to nitrogen6_max. This hardware was stable and could run Yocto without any failures....
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81 views

SMACK LSM Module behaves strangely

I want the following:I want to use openssl to change the keys. So, I created the directory "/etc/keys" which I labelled "keys". I created a file "key" with same access "keys" and another key file "...
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70 views

Why/How CentOS use out-of-date kernel on a up-to-date release?

I noticed CentOS 6.9 is still using Linux kernel 2.6 which is already discontinued, but CentOS 6 is in active maintenance and it even have a kernel update days ago, which is also 2.6.x. Does CentOS ...
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48 views

how FGLRX extracts VGABIOS if I get input/output error? AMD magic?

Laptop has integrated+discrete 2 AMD GPUs and I need to get their VGABIOS. People do this:echo 1 > /sys/devices/pci0000\:00/0000\:00\:01.0/romcat /sys/devices/pci0000\:00/0000\:00\:01.0/rom > ...
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Error in freeing memory for hibernation

When I try to perform hibernation on imx series board,i.e., echo disk > /sys/power/state, kernel gets into infinite loop like Freeing memory .... and so on.When I added some debug statements to mm/...
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50 views

is it possible to schedule different real time throttling policy on different cores?

sched_rt_period_us and sched_rt_runtime_us are global settings. Is there a way to set them differently for different cores?For example, for core 0 and 1, I want to use the default settings:# echo ...
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121 views

What should I install to output HDMI audio on my R9 380?

I've just installed Debian testing on my new computer with R9 380 display with monitor plugged into HDMI port. However, there is no sound coming out of it, and I found out that amdgpu in the current ...
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21 views

Can't boot on USB after a KERNEL_INPAGE_ERROR

I have encountered a problem which makes me wonder to no end. Let me explain it to you, and let's see if we can manage to find an answer.I have a laptop running Windows 7 for almost four years. I ...
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1answer
336 views

Cannot edit /proc/sys/kernel/threads-max

I am currently building a stress testing tool, and as such I need a pretty massive number of threads. I already went through all settings to raise the limit, but there is one last setting, the upper ...
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26 views

Is there a way to know how many ticks/cycles are needed to execute a command?

Is there a way to know how many ticks/cycles are needed to execute a given command on Linux server?I am trying to execute a command and I want to know the rate of speed at which that command is ...
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kernel module dme1737 only loads with special script not persistent on reboot, fancontrol not running as superuser and more

ok so the only way i can get a certain kernel module to load is one i discovered on accident by running a modules test script from gitshown here:im using ubuntu 17.04!/bin/bashi2c_addr=0x2e...
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61 views

Linux hangs after a few minutes of use but Windows runs fine

Here's the issue I've been facing within the last few weeks, I've tried numerous fixes and none seemed to work. I have recently bought a Gigabyte GA-970A-UD3P rev.1 motherboard and things began ...
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353 views

No OpenSSL sign-file signing_key.pem leads to error while loading kernel modules

I am having problems while loading/installing a kernel module. The kernel module builds successfully, but whenever I try to make module_install, the kernel seems to fail to load. It leaves the below ...
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Access file in remote FS using root privileged process

Let's say that I have a regular user (non administrator) that was created by active directory to gain access to remote filesystem by providing unique credentials (username+password).In addition, I ...
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1answer
48 views

Make sure I get security updates for kernel 2.6.32 on CentOS 6

I have an old CentOS 6 server that I want to update from CentOS 6.3 to CentOS 6.9Since CentOS came with kernel 2.6.32 (which reached out of life in Feb 2016), I did research on whether I should ...
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285 views

Use R within Jupyter notebook?

I am using the Jupyter notebook to create interactive code sheets in Python. Now that I have to work with R, I'm wondering: Can I use Jupyter notebook to compile R code as well?

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