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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11 views

Configure traffic class to bringup DCB in back-to-back setup on linux

OS :- CentOS 7.2 kernel 3.10.0-327.el7.x86_64 lldpad:- lldpad v0.9.46 dcbtool:- v0.9.46 ixgbe :- ixgbe-4.3.15 steps followed:- modporbe ixgbe service lldpad start Redirecting to /bin/systemctl ...
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0answers
19 views

Enable user namespaces in Debian kernel

I'm trying to figure out how to enable user namespaces capability in my kernel (I think CAP_SYS_USER_NS). I'm using Debian Stretch, kernel 4.6.0-1-amd64. My assumption is there is a way to turn ...
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0answers
46 views

What is the minimum amount of RAM required to run Linux Kernel in ARM cortex-a5?

I want to know what is the minimum amount of RAM required to run Linux Kernel (4.6) in ARM cortex-a5. Now I am using 32MB PSRAM but whenever I am loading vmlinux (elf format) through debugger to ...
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0answers
8 views

Adding supplementary group id to process

I'd like to add addition sgid to a running process. If i'm superuser, is there any option (system call) to change this (or any other process credential) without running it from a different user or ...
0
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1answer
52 views

Is Kali Linux 2 broken?

This might be just on my part but I really doubt that. I'm running it in persistence from USB, the most notable problems come when trying to login as root, can't it just acknowledges test and even the ...
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0answers
13 views

Display basic image color on the framebuffer

I am trying to debug an issue during the installation of Debian on PowerPC. It seems the Open Firmware Frame Buffer (offb.c built-in driver) is not setup correctly, and has red channel inverted with ...
1
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0answers
32 views

Kernel panic not syncing attempting to kill init

We have a Citrix Xenserver 6.2 install. Today we had an incident where power to the server was suddenly cut off from the server. It had been running for quite some time without issue. It has quite a ...
3
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2answers
111 views

Which is the user‑space command for resuming from hibernation?

During a long time, I used echo disk > /sys/power/state In order to hibernate to/dev/sda10and I was using the initrd of my Debian distribution to resume. But recently, I switched to a raid ...
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0answers
19 views

container running CentOS7 on a Centos6 host?

I thought that the containers uses the same kernel as the host... so I thought OS using different kernel versions wouldn't work and I did a test to prove this: I created a VM on virtualbox and ...
0
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1answer
63 views

Which address space is used in system calls? physical? or virtual?

Explanation There’s two kind of address space virtual and physical. On the physical model (typically used by the kernel) the memory is bounded and each address correspond to physical ones. The ...
0
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1answer
19 views

error when booting Linux kernel 4.4.2

I compiled a Linux kernel 4.4.2 on my Kali Linux distro with make allyesconfig. When I booted it up it is saying end of kernel panic - not syncing : fatal exception and stopped. What is the ...
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0answers
38 views

Unable to mount boot partition

I have compiled a custom environment using Yocto. I have most everything working now, but I've hit one major problem. The system boots fine, but after it does, I can't mount the boot partition. ...
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0answers
10 views

remove link form Linux namespace

I created a namespace in Linux with 'ip netns add foo', created a pair of veth interfaces and moved one in the namespace. I set up IP addresses etc., so that now I can ping my 'foo' namespace from the ...
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0answers
68 views

initramfs boot error on dual boot machine

Scenario: Dual boot windows7 and ubuntu machine. I downloaded a new linux kernel and then implemented 3 system calls on it. Then I compiled the kernel on ubuntu and tried to boot into the newly ...
0
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1answer
64 views

How to handle this warning: The Linux source in /lib/modules/3.19.0-25-generic/build has not been configured

I am trying to install a Sangoma PRI card on a Ubuntu 14.04 LTS. During installation of the drivers, it gives me this warning, followed by other errors which are a consequence of this issue (or so I ...
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0answers
39 views

Disable RAID in custom kernel?

I need a Gentoo 13 machine to test some software on the platform. I'm not a Gentoo regular, so I'm suffering their procedures. I noticed the kernel spends a couple of seconds booting due to RAID ...
2
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0answers
162 views

Linux boot fails with /dev/disk/by-uuid/XXXX does not exist - Asus Zenbook Pro Touchpad Not Working

Device: Asus Zenbook Pro ux501vw-ds71t Ubuntu Version: 15.10 I installed Ubuntu 15.10 and the installation was successful. However, the Elantech touchpad did not work. I read that the newer 4.5.0-...
1
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1answer
87 views

How to pass CONFIG_BUILD_DOCSRC=n to genkernel?

I need a Gentoo 13 machine to test some software on the platform. I'm not a Gentoo regular, so I'm suffering their install procedures. I'm at Configuring the Linux kernel, and it failed with: (chroot)...
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2answers
88 views

How to get linux terminal print info and save it to a file

How to get linux terminal print info and save it to a file? there are print information about the application, there are kernel print information.I want to save all the terminal program's output to a ...
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0answers
8 views

Enabling TransHugePage in User Mode Linux

I am running User Mode Linux with Gentoo file system and using 32 bit Linux kernel version 3.12.36. I am not able to enable THP because I am not able to find the requisite file: ls /sys/kernel/mm ...
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0answers
20 views

Flashing Linux on Ncommputing L300 board

I have a bunch of L300 Thin client nodes which are of now use to me any more. I plan to give away the units after flashing linux into them, because as a standalone device wont achieve achieve ...
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0answers
31 views

Install x86_64 kernel on already installed i686 system

I have a 64-bit machine with Arch Linux i686, while the processor (Intel Pentium G3258) could support 64-bit. Being a 32-bit OS I can only use 3Gb of RAM out of the 8Gb installed. Since I have a ...
0
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1answer
31 views

How does encrypting /home partition with ecryptfs on linux stop malicious modification of /boot or /(root)?

This is a page where a developer of ecryptfs explains the difference between ecryptfs and dm-crypt: https://stackoverflow.com/questions/18230784/what-is-difference-between-linux-kernel-subsystem-dm-...
1
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1answer
16 views

why is openat() needed to avoid a two-step race condition with stat and then open()?

The explanation at http://man7.org/linux/man-pages/man2/open.2.html about why openat is needed, reads in part: openat() allows an application to avoid race conditions that could occur when ...
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0answers
41 views

Custom Android kernel with Sys V IPC

I know that Android uses Google's own Binder IPC, which is built-in to every Android kernel. This causes a dilemma for running GNU/Linux systems on a mobile device: keep the Android kernel, and ...
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0answers
70 views

ACPI doesn`t work properly?

My PC with next parameters H/W path Device Class Description =================================================== system P5K PRO (To Be Filled By O.E....
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0answers
25 views

Linux: Why UID and GID are 0 despite not being the root user?

Just a question here. I was looking through my program and its pid, uid, gid. And I found UID and GID are 0 but I'm not signed in as a root user. Why is this the case? And I am curious if UID and ...
0
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1answer
894 views

Kernel 4.4.1-1 fails to boot - root volume “does not exist” - 3.10.0.327 and 4.3.3-1 both continue to boot fine

I'm trying to install and boot kernel-ml (currently 4.4.1-1) on RHEL 7.2 following the instructions here: http://linuxg.net/install-kernel-4-x-on-enterprise-linux-7-centos-7-and-rhel-7/ Install works ...
1
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3answers
90 views

How to launch vmlinuz-linux from efi shell?

How to start vmlinuz-linux from efi shell ? I jump into the ESP and type vmlinuz-linux (vmlinuz-linux is in the ESP) but it says vmlinuz-linux isn't recognized as an internal or external command, ...
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0answers
20 views

How to Disable Linux kernel tracer

I have installed Ubuntu 12.04 (32bit). The current tracer is set as nop. cat current_tracer nop cat tracing_on 0 Although the current tracer is nop and tracing is disabled, all these following ...
1
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1answer
34 views

Virtual machine running a *newer* linux kernel?

Is it possible to, for example, have the main system be Ubuntu 15.04 and install a virtual box that runs Ubuntu 15.10 inside of it? Or does the host system have to have a Linux kernel that is at least ...
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0answers
41 views

Cannot find root device when loading a new kernel image

I am trying to install an old linux kernel image 2.6.32.69 just for learning purposes. The machine is ubuntu 15.10 32 bit. The commands to build kernel are: make oldconfig make bzImage make modules ...
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0answers
280 views

How do I fix Manjaro error hibernation device not found on boot?

After installing updates and restarting I got these errors. ERROR: resume: hibernation device 'UUID=long number here' not found ERROR: device '/dev/mapper/ManjaroVG-ManjaroRoot' not found. Skipping ...
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0answers
51 views

Run X window system with CONFIG_VT=n in linux

I have an Arm device that I installed Gnu/Linux on. Unfortunately the full source tree to linux with the patches required to make it work on is not available. There is a close version to the source ...
1
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1answer
283 views

sd card not detected at all in linux

My SD card reader is not detecting any SD card. There is no output from dmesg when an SD card is inserted. df does not detect anything and also nothing in fdisk -l. Does linux support SD cards? I ...
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2answers
804 views

How to install kernel rc rawhide in Fedora?

I am new to Fedora and I decided to try it on my new laptop instead of Ubuntu. I have an XPS 13 (9343) and the sound is not working. I researched online and found out that people had success ...
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0answers
24 views

Freeze when starting Windriver os

When I start Windriver OS, it always freeze. And it shows this text in console window: acpid: 0 rules loaded <br> acpid: waiting for events <br> Starting advanced configuration and power ...
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2answers
256 views

What is the exact different between Linux kernel release and version? [duplicate]

In Linux based operating system we can find Kernel release and Kernel version. So what is the exact different between Release and Version ?
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0answers
275 views

linux bluetooth firmware missing

The kernel is trying to load a bluetooth firmware version that does not exists. dmesg: [ 4.435796] Bluetooth: hci0: read Intel version: 370810011001140d00 [ 4.436742] bluetooth hci0: Direct ...
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0answers
46 views

How to get config from a EFISTUB kernel?

I am working on getting normal Linux onto a x86 Android tablet. Only kernel I can find is efilinux.efi located inside the system’s ESP (\EFI\Intel\efilinux.efi). But I can’t get config through these ...
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0answers
633 views

How to upgrade kernel in Ubuntu 14.04?

I want to use Docker on my Linux server for which I need to upgrade the kernel to 3.10 or higher. So following this answer I was trying sudo apt-get install linux-generic-lts-trusty, which results in: ...
5
votes
1answer
333 views

Hairpinning in Linux

I have a router in which I installed a Linux system. I want my router to support NAT hairpinning. Does a such feature exists in Kernel Linux? If yes how to activate it? Are there a patch to apply it ...
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0answers
65 views

Disable kernel module loading on custom initramfs.igz

my machine, which runs GNU/Funtoo Linux on one of the 2 raid0 arrays it has, needs an initramfs with dmraid support to boot into the system. During the last 7 years i've been using a custom initramfs ...
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0answers
35 views

Why WiFi drivers carry firmware with them?

Why do linux kernel modules for wireless LANs have 'device firmware'accompanying them while other driver modules don't seem to carry a copy of the firmware with them? Edit: I've been informed that ...
3
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1answer
114 views

Why is USB Serial so fast in linux?

I've just started using a 3G modem on a RaspberryPi using the "stock" USB Serial driver from the linux kernel (as indicated in the modem documentation). Once the modem was recognized and appeared as a ...
3
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2answers
49 views

Does Installing a driver increase linux kernel memory footprint?

I have read that linux kernel is monolithic kernel and it contains drivers within it, in a single file. For example, I have two linux kernels 3.16.0.40 and 3.16.0.50 Currently booted system with 3.16....
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1answer
2k views

Problems installing VMware on arch linux

I'm trying to install VMware but when it gets to "before you can run VMware, several modules must be compiled and loaded into the running kernel" I click install, enter my password, and i get a error ...
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0answers
54 views

User-mode Linux aborts on start

I am attempting to test a modified linux kernel by booting it with UML. I was able to build the kernel without a problem, but when I try to start the built kernel with UML, I get an abort signal, as ...
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0answers
97 views

kernel(security_netlink_recv) = 0x3a2204c6 is needed

I am trying to install drbd (packages are fetched from elrepo). Both drbd and kmod-drbd are version 8.4.3-1 and I am using CentOS 6.7 with kernel version 2.6.32-573.el6.x86_64. When trying to ...
0
votes
1answer
122 views

udev - change event from udev_device_get_action

I am monitoring the events of all devices connected to the host. Linux has udev daemon , which listens to all the device specific events such as online, offline, add, remove and change. I use a ...