The kernel of operating systems popularly known as Linux, or sometimes GNU/Linux.

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4
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1answer
38 views

Do I have to publish kernel source if I release a custom kernel?

I have a kernel for an android phone ready for release. I always have the current source code already pushed to GitHub for release builds. However, I also have an experimental folder on my server ...
0
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0answers
67 views

SMB/CIFS mount not working with exec() call

To mount CIFS presently I use system() call in source, this works. If I try to run command manually on shell it works too. $ mount -t cifs //IP/dir /mnt -o user=name,pass=PASS,domain=mydomain,nounix ...
1
vote
1answer
47 views

Where is routing table stored internally in the Linux kernel?

When I execute route -n, from where exactly (from which structs) is the information displayed retrieved? I tried executing strace route -n but I didn't help me finding the right place it's stored.
1
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1answer
37 views

RHEL not booting with the updated kernel after upgrade [closed]

We have recently upgraded RHEL boxes, but the system only booted with the old kernel. Observation is that there is no link /etc/grub.conf to /boot/grub/grub.conf. Now, to boot the system with the new ...
0
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2answers
61 views

how to untar file in linux red hat?

I am compiling linux red hat stable kernel on red hat linux and the error which I am facing is as below
0
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0answers
15 views

Which linux kernel options need to be enabled to support bluetooth low energy?

Which are the mandatory and optional options?
0
votes
1answer
31 views

Kernel modules for compiled kernel

I cannot find kernel-headers. For the first time I compiled and installed the latest kernel (4.0.3) on my Debian Wheezy, and now I am trying to install ndiswrapper using module assistant. For that, ...
0
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0answers
21 views

Trying to use KDBG, but it produces error 11

I am trying to start kdbg on Ubuntu, but it produces this error message: MNG error 11: function is invalid at this point ; chunk MHDR; subcode 0:0 MNG error 11: function is invalid at this point ; ...
2
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0answers
58 views

How to read the output of the show-memory-usage SysRq?

I couldn’t find any (recent) documentation on reading the output of the show-memory-usage SysRq (Alt+SysRq+m). So what can one learn from looking at it? Here is an example output form my box (Kernel ...
0
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2answers
51 views

how to check a kernel version which was used when building package

I use apt when downloading packages from Ubuntu repositories. How can I check which kernel version was used when building package? When it is important (kernel version of the build server vs. kernel ...
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0answers
42 views

What is the difference between Local timer interrupts and the timer?

When I do cat /proc/interrupts on my multicore x86_64 desktop PC (kernel 3.16) I see this: 0: 16 0 IO-APIC-edge timer LOC: 529283 401319 Local timer interrupts ...
2
votes
1answer
101 views

Change hidraw device from mouse to joystick

I have a wireless PS3 controller adapter that is plugged in to my Ubuntu 14.04 box. It has 2 modes: XInput and DInput, which as far as I can tell, it just passes two different vendor/product id's ...
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0answers
50 views

How to get the mouse/keyboard raw events?

I want to intercept the raw events from the keyboard (or the mouse, eventually). I tried to use the /dev/input/[...] files, they are very practical and I can read the events of any key even caps lock ...
0
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0answers
19 views

Want a bash script for file system monitoring for multiple RHEL servers [duplicate]

I'm trying to prepare a bash script to monitor file system utilization for more than 80% on 20 RHEL 6 servers. Below is the script, #!/bin/bash ADMIN="abcd@zxy.com" ALERT=80 dt=`date '+%a %b %e %I:%M ...
2
votes
0answers
31 views

How to work with a kernel one has no information about?

I'm working with a system to automatically assemble Live CDs. It came packaged with a kernel (seemingly based on 3.13.11), that has been working without problems so far. I noticed that, when I try ...
1
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0answers
9 views

Having problems with negative monitor channel, intimidated!

When I try this command: aireplay-ng -1 0 mon0 -a xx:xx:xx:xx:xx:xx I get this output: No source MAC (-h) specified. Using the device MAC (xx:xx:xx:xx:xx:xx) 17:51:23 Waiting for beacon frame ...
0
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0answers
122 views

Ubuntu: freezing on startup

I recently installed Ubuntu 14.04 on a new ThinkPad laptop as a dual boot with Windows 8. It has been running for a few days without issue. However, when I booted my computer today, it got stuck on ...
5
votes
1answer
45 views

What is a sync during kernel boot?

If something prevents a Linux system from booting, it is common to see this message: kernel panic - not syncing: [Error Message] But what does "not syncing" mean? What exactly isn't syncing? The ...
7
votes
4answers
706 views

Is it possible to tell if my Linux kernel is custom (i.e. compiled) as opposed to distro?

Taking example of Ubuntu, can we tell if the kernel was custom compiled rather than what comes with distro?
6
votes
1answer
99 views

Understand Linux kernel virtual bridge port numbering

I have a Linux kernel virtual bridge which contains interfaces eth1 and tap0: # brctl show br0 bridge name bridge id STP enabled interfaces br0 8000.00016c404fa3 ...
2
votes
1answer
63 views

Debian: How to get the current loaded kernel package name?

With the following command, I can list all the installed kernel package: $ dpkg -l | grep linux-image With the following command, I get for instance the version of the current kernel used: $ uname ...
1
vote
1answer
43 views

What do the terms CC, LD and SHIPPED refer to during the Kernel Source compilation process?

What do the terms CC, LD and SHIPPED refer to during the Kernel Source compilation process? Am I correct to assume that [M] indicates that it is being compiled as a module?
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vote
2answers
80 views

What proportion of memory does the Linux kernel use of the installed RAM?

I'm developing a compute cluster and I'm trying to determine the maximum amount of RAM I can give to a single process. On a machine with 16GB of ram, the answer is that I can allocate (and touch) ...
1
vote
1answer
33 views

XFRM_SUB_POLICY config in kerne

When testing strongswan performance, we saw that the performance differed by a lot between an ubuntu server and a centos server, with everything else being the same. We noticed that the ...
1
vote
1answer
47 views

How do I understand if an USB Ethernet adapter is compatible with a certain kernel version to use it to load kernel/filesystem?

I'm using an old kernel, 2.6.32, and I would like to boot the kernel over TFTP and mount the filesystem over NFS. Mounting the kernel over TFTP is a plus, but mounting the filesystem over NFS is a ...
0
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0answers
23 views

Continuety of driver support in linux kernel

I am an embedded GNU/Linux learner. I understand with the new Kernel, driver support for most added hardware is coming through Device Tree Structure (DTS). But I have found out that there are still ...
1
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0answers
23 views

Find the creator of a task

I would like to find the creator task of an arbitrary task in the Linux kernel. However, I am not sure, if there is a way to do this in general. Normally, you can find the creator of a task via the ...
0
votes
1answer
30 views

Install kernel .deb file without using dpkg

I'm running Manjaro (Derived from Arch). I have a .deb file for kernel 4.0. Is it possible to install the kernel from this file, and what are the steps involved? I tried opening the .deb file and ...
2
votes
1answer
38 views

add key to proc/keys

How do I add a key to a keyring in /proc/keys ? My openembedded Linux does not come with a keyctl command program. And all I can find on google is the programming interface, but I would like to do ...
1
vote
1answer
49 views

what if I uninstall all linux kernel images from my system

If I run this: sudo apt-get purge linux-image-* this will definitely remove all linux kernels images from my system. so the question is will I be able to use my system normally until I reboot or ...
0
votes
1answer
96 views

How can I edit /proc/net/tcp?

I need to edit 1 line in /proc/net/tcp while the file is also used by the linux kernel for updating other lines of it by the kernel. Background: Each line in /proc/net/tcp represents a TCP socket. ...
2
votes
1answer
160 views

Device eth0 does not seem to be present, delaying initialization

I have cloned a fedora and now trying to configure network interfaces. Every time i am adding a new NIC, it starts with number eth3 (rather eth0). i have tried removing and modifying the ...
1
vote
1answer
106 views

What happened after I upgraded the kernel version?

I have Linux Mint 17.1 Cinnamon version on my notebook HP Compaq 15-h050nl and about 1 month ago I upgraded the Linux Kernels to the current version (3.18.2-031802-generic) from the last version. ...
0
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0answers
44 views

centos 7 installation with customized bridge module

I have installed latest Centos 7 x64 edition in my server. I need to modify the linux-bridge module with some customized changes and use it as a default bridge module. Currently I am building centos ...
0
votes
1answer
92 views

Getting error virtualbox-guest-modules: requires linux<4.0 on antergos while doing system upgrade

I am running Antergos Linux 64 bit on virtual box. when I try to do full system upgrade I get a error: resolving dependencies... looking for conflicting packages... error: failed to prepare ...
1
vote
2answers
72 views

Identify out of tree modules?

I'm attempting to upgrade and test kernel 3.12. What is the most efficient way to identify out-of-tree modules that should be removed before testing? There are a few mentioned (vitualbox, nvidia, ...
0
votes
0answers
15 views

“un-select” behavior in kconfig

Are there any ways to generate the behavior of an "un-select" over an option? I don't want the option to disappear ("depends on" behavior), but just the opposite behavior of "select". Thank you very ...
0
votes
1answer
61 views

Kernel Firmware for Radeon

I'm building LFS. I was trying to enable Ati radeon drivers in the kernel, but it didn't seem to work, so I did a little Googling and found that the there is something called firmware which the kernel ...
0
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0answers
24 views

installing r8168 driver in centos 4.8

I have installed cent os 4.8 and I am not able to connect to internet from that system. After searching on the net I found that the system has r8169 driver instead of r8168. Now I am trying to ...
0
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0answers
15 views

Different types of pageouts - Data?

In Linux, pageouts are controlled by the following properties /proc/sys/vm/dirty_expire_centiseconds /proc/sys/vm/dirty_background_ratio /proc/sys/vm/dirty_ratio Thus pageouts can happen due to ...
2
votes
1answer
66 views

Linux kernel action upon init process exiting

Say I am writing my own init program running on a Linux kernel. What happens when my init program exits with return value 0 ? Additionally is the behaviour different if the return value is non-zero? ...
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0answers
33 views

how to set or know scaling driver in linux kernel

I am trying to modify the scheduler/governor. For the same I need to know what CPUFreq Driver or scalling driver am I configured to run. 1.Where can I find what scaling driver am I configured to ...
0
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2answers
49 views

Find SAS controller that is well supported by the linux kernel

How can I find a SAS controller that is well supported by the official Linux kernel? The controller should use the PCIe bus and needs to connect one LTO-6 tape drive. I have looked through the ...
6
votes
2answers
96 views

Besides cache, what does the Linux kernel use significant amounts of memory for?

My computer feels really sluggish. According to free, I have only ~200M RAM left and more than a gigabyte had to be swapped out. I know that it is good if memory is used for caching but this looks ...
0
votes
0answers
30 views

Starting Kdump: FAILED

I am unable to start kdump on my machine. It is prompting Starting Kdump: FAILED. I have edited the /etc/grub.conf file and provide 1024M to crashkernel. I have also provided the path to where the ...
2
votes
0answers
312 views

Can I make the boot even more verbose than loglevel=7 using kernel parameters?

I have an error when booting on a machine, my machine is stuck with the error message: Booting a command list. I can see this message when I add loglevel=7 and only if I delete the quiet in the ...
0
votes
1answer
63 views

How to select the tag of the latest non-unstable/release candidate version?

I've downloaded the latest kernel sources: git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git cd linux-stable git tag -l | less and picked v3.9.1. git checkout -b ...
1
vote
1answer
151 views

Linux Kernel Live Patching - WHATIS and HOWTO?

I am trying to understand a new concept I got to know recently as the Linux 4.0 makes it way to the mainline - "Live Patching". Supposedly this is a new feature enhancement of the Linux kernel. It ...
0
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0answers
40 views

Repackage RPM with kernel

I am tinkering with CentOS 5.4 and upgrading the kernel to the latest 2.6.18 build 402. What I need to do is to rebuild the initrd to include a modified init script, then repackage it all into an RPM ...
0
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0answers
73 views

isolcpus doesn't work on Ubuntu 14

I added isolcpus=0 to the end of the following line to the file /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=0" The idea, as I understand it, is to reserve core 0 from having ...