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Questions tagged [linux-kernel]

The Linux kernel is the operating system kernel used by the Linux family of Unix-like operating systems. It is one of the most prominent examples of free and open source software.

The Linux kernel is the operating system kernel used by the Linux family of Unix-like operating systems. It is one of the most prominent examples of free and open source software.

The Linux kernel is released under the GNU General Public License version 2 (GPLv2) (plus some firmware images with various non-free licenses[citation needed]), and is developed by contributors worldwide. Day-to-day development discussions take place on the Linux kernel mailing list.

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I have deleted /etc/rc.d/ dirs, how can I restore them?

I have accidentally deleted /etc/rc.d and /etc/rc0.d folders which resulted deletion of init.d and other related folders. 1.What is the use of /etc/rc.d, rc, rc.d, rc0.d, rc1.d, rc2.d.......rc6.d and other files inside /etc/rc.d? 2.If we…
Tech User
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Linux pvmove gone awry after turning on mq_deadline, any way to recover?

So we had a migration in the office using pvmove. Then this happened Mar 8 12:26:51 v1 kernel: [ 5798.100321] BUG: kernel NULL pointer dereference, address: 0000000000000140 Mar 8 12:26:51 v1 kernel: [ 5798.101099] #PF: supervisor read access in…
Ajay
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Why is oom-killer truncating the name of a presumed offending file?

Here's an example log Jan 31 11:46:15 [kernel] [753684.206218] /usr/local/Calc cpuset=/ mems_allowed=0 Jan 31 11:46:15 [kernel] [753684.206244] CPU: 0 PID: 7577 Comm: /usr/local/Calc Tainted: P Now here's the thing, /usr/local/Calc is not a thing…
mauricev
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How can I tell which version of CIFs is in the kernel if CIFs module isn't loaded?

I need to determine the CIFs version that exists in my kernel, but the CIFs module isn't loaded. my-user@ip-XX-XX-XX-XX:~$ modinfo kernel/fs/cifs.ko modinfo: ERROR: Module kernel/fs/cifs.ko not found. When I run find /lib/modules/$(uname -r) -type…
Shawn
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How to disable IPv4 and enable only IPv6 on arm Linux target?

I am testing bind9 dns server for AAAA records. I would like to disable IPv4 to stop dns requests going to my default ipv4 dns server. In the resolv.conf i have added domain mydomain.com nameserver xxxx:xxxx:xxxx:xxxx:xxxx::xxxx search…
VamsiKrishna Neelam
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Is there a way to have two versions of the same Adaptec RAID driver installed on RHEL 5 / CentOS 5?

We have an older Adaptec 5805 RAID controller on our CentOS 5 server. (I added RHEL 5 to the question because of the similarity in these Linux distributions.) An Adaptec 8805 controller was recently added, but it is not detected by even a recent…
Jake
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Commands to Upgrade Kernel on CentOS 7

My current kernel is 3.10.0-957.1.3.el7.x86_64. I got to know about this by using the command uname -r. Now I want to upgrade my kernel version to 3.10.0-1062.12.1.el7.x86_64. I used the below blog to upgrade my…
Subramanian Lakshmanan
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Nearly 100% disk utilization after upgrading to debian 10 without any reason

We recently upgraded our servers to debian 10. The setup is completely the same as with debian9 beside of course some new software packages. We are running the default kernel: $ uname -a Linux kt105 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u2…
Janning
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df -kh command in linux is showing 100% storage but df -i showing 18% storage why it is happening?

Output of df -kh [root@mavdu ~]# df -kh Filesystem Size Used Avail Use% Mounted on /dev/sda1 2.9G 2.9G 0 100% / devtmpfs 5.7G 0 5.7G 0% /dev tmpfs 7.7G 0 7.7G 0% /dev/shm tmpfs 7.7G 26M …
Ravi Patidar
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AMD Geode LX linux : how to instruct driver to enable flat panel?

Platform : PC/104 with AMD Geode LX CPU with integrated graphics. Buildroot framework, kernel 4.18.10. I am building a custom Linux system with Buildroot. Since I compiled the Geode LX frame buffer driver in the kernel (lxfb), I get a black screen…
dplamp
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How to enable IBRS when it is disabled?

I have been updating some servers to the latest patchlevels and wanted to check the security state regarding Meltdown, Spectre and Spectre-NG. Using the current V 0.39+ of the spectre-meltdown-checker I was astonished about my findings in a VM…
Nils
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When someone gains remote access to a server are there other ways to execute system commands other than the bash shell?

I am hardening a server and attempting to build a restrictive layer to a potential hacker even with root access to the server to do harm. If a user gains root or user access to the shell via say ssh, is there any other way for a user to access…
I'm Root James
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Diagnose Sudden Slowness on Linux

I have two identical Linux laptops (Core™ i7-4810MQ with 32GB RAM) both running Ubuntu 16.04. Running seemingly any command on machine 2 takes about 4-12 times as long as on machine 1, depending on the activity. This was noticed late last week while…
chadsgilbert
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Linux kernel build - dont change vmlinuz

When building an upstream kernel, /boot/vmlinuz and /boot/System.Map are updated to point at the newly installed kernel image. Is it possible to disable this behavior, perhaps by changing a config or Makefile parameter? I'm building the kernel like…
David Farrell
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Better stream performance when transparent hugepages are on

On rhel 7, when transparent hugepages are activated, I get a better stream benchmark performance than when transparent hugepages are off. Do you have any idea of a kernel parameter (or another thing) which could trigger this behavior ? I was…
user380763
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