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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13 views

Possible problems of down grading linux-kernel

I am running a Open Network Linux on a switch, it is running a 3.8.13-OpenNetworkLinux-e500mc-1.5, which is a variant of linux kernel 3.8 . I want to change to linux kernel 2.6.27. Will there be any ...
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21 views

Strange noise with alsa-oss-emulation

I try to access the sound chip via ALSO OSS emulation on a ETX-BT-module (x64-CPU, x86-Kernel, vanilla kernel 3.10.10, busybox, Realtek ALC 262, 4-channel High Definition Audio integrated into SOC ...
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0answers
118 views

USB drive not getting recognized as scsi device in custom linux kernel

I am facing a slow write speed problem with a USB drive in my custom linux kernel. I suspected to be a hardware problem but with the same hardware and Opensuse 12.1 OS, write speed of my USB drive is ...
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1answer
180 views

System hangs when using too much RAM even with swap off

When I run a piece of python code that uses too much RAM, my computer would start to swap so badly that I had to do a hard reboot. To fix this I turned off swap assuming that the OOM killer would ...
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0answers
75 views

Ubunbtu 12.04 iptables error after upgrading kernel to 3.4

I been using Ubuntu 12.04 for well 3 years and using it with kernel 3.2. I decided to upgrade to kernel 3.4 because some freezing problems starting to occur more and more. Well the update went well. ...
2
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1answer
138 views

In Linux, how is a program loaded into memory when the OS decided to run it?

As we know, Linux implements page cache to store the code or data from pieces of a file that will be potentially used. One of my question is, when a program, e.g. vim, is going to run, its data and ...
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0answers
30 views

notebook asus x551ma - moire pattern takes place - how to reduce effect on linux

I just faced a strange issue with my notebook asus x551ma LED and LCD (the Moire Pattern) which is quite good described on wiki pages; Some users provide "how they handle the effect for their ...
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2answers
26 views

How can I tell what process is unmounting a file system?

I am trying to troubleshoot an issue with a fuse library, where it appears that someone is causing my file system to be unmounted soon after it is mounted. Does anybody have any clever ideas how I ...
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1answer
27 views

dmesg -n 7 doesn't print anything, but dmesg prints a lot

As stated: $> dmesg [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Initializing cgroup subsys cpuacc ... $> dmesg -n 2 [ ...
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1answer
45 views

Sharing a hard drive between two hosts, one at a time

I have a large hard drive in my desktop computer. My laptop has an eSata port. Sometimes, I power-up the desktop PC, without booting, just to get juice flowing into the hard drive so that I can ...
1
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1answer
307 views

Force a Linux kernel module to be compiled as a module instead of built-in

I have the sources of the kernel of an embedded Linux box (specifically a QNAP NAS) which is running a 64-bit v3.12.6 Linux kernel, together with the kernel config files. What I'm trying to do is ...
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1answer
193 views

How to change the default terminal beep frequency of the PC speaker?

I want to change the default sound frequency ofSND_BELL(which is used when\aor BEL or ^G is printed on the screen) to higher values (the current default is around 750Hz). Of course this turn to need a ...
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1answer
33 views

Ubuntu 10.04 | Terminal Freezes on certain commands | MTU

Isolated problem: I try to cat /etc/rc.local and I can't do anything in the ssh session after that. I've tried many of the common things, but it seems to freeze on any command, but I can do an ls, ...
2
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1answer
92 views

VirtualBox broke Fedora networking - how to fix it?

I was trying to install VirtualBox in my Fedora 21 machine. However, the cited machine has Secure Boot enabled and obviously VirtualBox startup failed miserably due to lack of signing in its modules. ...
0
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1answer
143 views

Uninstall latest kernel using yum

The latest kernel kernel-3.10.0-229.1.2.el7.x86_64 panics at boot on my CentOS 7 box due to a kernel bug. Since this kernel is the default in GRUB, if I forget to manually change the kernel selection ...
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0answers
137 views

Kernel building with CONFIG_LOCALVERSION doesn't work with fakeroot debian/rules binary-generic?

I'm following the instructions in https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel and I've set CONFIG_LOCALVERSION in the menu to "xhci_mod_test". I then run fakeroot debian/rules and it proceeds ...
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0answers
44 views

Which devices in /sys/block are HDDs?

I'm interested which devices in /sys/block are real HDD drives: [root@sdp1a block]# pwd /sys/block [root@sdp1a block]# ls dm-0 dm-12 dm-3 dm-7 loop1 loop5 ram1 ram13 ram3 ram7 sdaa sdae ...
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0answers
35 views

How to change kernel message VT in linux

I feel kinda stupid, since I'm certain I used to know this. But here goes. How can I change which VT kernel messages print to? I use text-mode primarily, typically on vt1. Unfortunately, kernel ...
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0answers
64 views

Build DAHDI for Beagleboneblack Error

I'm planning to build DAHDI for Beagleboneblack Firstly, I built the kernel for BBB completely by following this tutorial http://elinux.org/Building_BBB_Kernel make ARCH=arm ...
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0answers
43 views

Thinkpad Edge E545: Failure to load kernel through efi

Now this is an issue I've been battling for a long time ... I am trying to make a proper UEFI dualboot system, the problem is I cannot seem to load gentoo kernel either simply by using EFI stub (also ...
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0answers
78 views

Why should an interrupt context not sleep?

I have learned that, on Linux, an interrupt context should not sleep because it cannot wake up again. Why can it not wake up? What happens if it goes to sleep?
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1answer
176 views

how to enable pci hotplug support in ubuntu 13.04

Kindly help. I have a pci-based wifi adapter which is not getting detected when i plugged it into the laptop. OS: Ubuntu 13.04 Kernel version: 3.8.0-19-generic
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2answers
6k views

Where are Kernel Headers for Fedora 21?

I'm trying to install VMware on Fedora 21. I've installed the kernel headers: sudo yum install kernel-headers-`uname -r` And I receive the following message: Package ...
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0answers
47 views

cpusets compiled in kernel but not visible when running

Device: radxa ( 4-core ARM ) the official kernel from radxa is used with the ubuntu 14.04 rootfs : https://github.com/radxa/linux-rockchip.git. As cpusets where not enabled in def_config, i enabled ...
2
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1answer
107 views

Where is /sys/subsystem as described in Linux kernel doc?

Quote from https://www.kernel.org/doc/Documentation/sysfs-rules.txt: [...] It is planned to merge all three classification directories into one place at /sys/subsystem, following the layout of the ...
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1answer
63 views

What's the minimum overhead of a Linux container?

If I understand this correctly, a container, once running, shouldn't have any CPU overhead. Is that correct? It does have a memory overhead. How big might that be? How would I measure it?
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1answer
77 views

Does the guest OS need updates/changes after changing the number of cores in VMware Player?

I installed ubuntu on a vm in VMware Player and forgot to change the number of cores from 1 to 8. If I change that now will the linux kernel need to be recompiled or anything like that or will it just ...
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0answers
217 views

Using a gif for linux kernel boot up

I want to use either a gif or multiple looped images instead of the default linux boot up image. I know it is possible to replace the default image with another image, but is it possible to use a gif ...
1
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2answers
257 views

How can I get socket information, from outside of a Linux process, on its socket?

I'm specifically interested in listening TCP sockets, but getting all and any socket (struct sock, as defined in Kernel's include/net/sock.h) information for a socket would be nice. For example, this ...
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1answer
34 views

How to compile the linux without any audio codecs?

I want "no audio" functionality in an embedded system. So, any idea about how to configure kernel without any audio? Thanks.
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1answer
499 views

Cannot start LXC container: failed creating cgroups

I am using LXC (Linux Container) 1.0.6 on a Ubuntu 14.04 64bit Virtual Machine trying to build HTTP service in a container. I have trouble starting the container: $ sudo lxc-start -n test1 lxc-start: ...
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1answer
158 views

Where can I find the origin of specific modprobe conf option to erase it?

When I do modprobe -c |less The configuration files contains: options nouveau modeset=1 options bbswitch load_state=0 unload_state=1 options b43 nohwcrypt=1 qos=0 options rd md=0 options rd dm=0 ...
0
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1answer
239 views

What could cause out_of_memory & __alloc_pages

Sadly my server is permanently hangging due to out of memory: Nov 8 07:30:43 crawler kernel: Nov 8 07:30:43 crawler kernel: Call Trace: Nov 8 07:30:43 crawler kernel: [<ffffffff800cb625>] ...
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0answers
36 views

Keyboard and mouse don't work after kexec

While installing Fedora on my MacBook Pro Mid 2012 I've occasionally used kexec command to "boot" from live environment to the installed system. # yum install kexec-tools.x86_64 # mount LABEL=/boot ...
0
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1answer
56 views

Patch files for Linux Kernel 2.6

I am doing some data analysis on the code base of Linux kernel version 2.6. However I noticed that in the kernel website (https://www.kernel.org/pub/linux/kernel/v2.6/) patch files are missing after ...
3
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1answer
178 views

Gentoo Linux: Building a kernel that only only contains drivers for the hardware in place

I would like to build a kernel for my system that only contains modules for the hardware which is really in place. Of course I can walk through lspci and manually select all the necessary device ...
0
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1answer
81 views

Will Linux work correctly with full root partition?

Will Linux work correctly when root partition is completely filled up? Let's say my application is running on different partition and has enough space. What about Linux kernel? Will it continue ...
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0answers
37 views

pppd retry issue with multiple wan interfaces

I am using two wan connections in my router with linux kernel 2.6.21. PPPOE Ethernet cable and 3G connection. Both need ppp setup. But boot sequence is different for both. many times 3G disconnect and ...
1
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1answer
66 views

Linux NTFS-3G General Protection Fault when using OS X in VirtualBox

I have an OS X virtual machine in VirtualBox on a Debian host. The disk image is located on an NTFS partition (which is not the system's root partition), mounted using NTFS-3G. The machine was ...
2
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0answers
163 views

Chipsee 7 inch LCD support in Linux kernel 3.14

Has anybody ported Chipsee 7 inch LCD on Linux kernel 3.14 or later ? Is there any patch available for the same ? If no patches any suggestion porting Chipsee LCD support from Linux kernel 3.8 to ...
2
votes
2answers
4k views

How do I stop rfkill module from hardblocking my wifi, without rfkill command?

I went into my BIOS the other day, didn't change anything, and rebooted. After this, my wifi was hardblocked. I looked online for solutions, and learned of the rfkill command. But I get rfkill: ...
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2answers
84 views

installing linux without any packages

I am programming a OS based on Linux but I want to "re-invent the wheel" in this OS just as an achievement. I have been told that Linux can be installed on a PC without any packages (obviously causing ...
1
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1answer
203 views

Install recent linux version in old computer?

I have tried to install several distros and versions of linux (Ubuntu and Lubuntu, from 13 to 14.04, and Mint 17) without success. Everytime the system blocks while loading the installation. I can ...
0
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1answer
78 views

Upgrading Linux kernel module without reboot

Is there any way to upgrade linux driver module without rebooting the system ?
2
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0answers
452 views

/sbin/init exists but couldn't execute it

I'm building Linux from scratch. Currently I have the kernel, glibc and sysvinit. I've compiled everything myself following these instructions. Though my version of glibc is 2.19. Also, I use grub ...
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0answers
812 views

Disable TCP keepalive on RHEL6

Is it possible to disable TCP keepalive on RHEL6? I know the kernel parameters for tuning TCP keepalive timeout are as follows: net.ipv4.tcp_keepalive_time net.ipv4.tcp_keepalive_intvl ...
0
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1answer
275 views

Can't load tun module in Linux

I am trying to set up a VPN connection, but OpenVPN fails with ERROR: Cannot open TUN/TAP dev /dev/net/tun: No such device (errno=19) modprobe tun has no effect, and modinfo tun shows that the ...
15
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2answers
10k views

Directory - /sys in linux

Can anyone explain me what is going inside the /sys directory on a Linux system? I Googled it and got some results, but I need a clear mind on this. Is there anyone ready to give me a short (and ...
0
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0answers
299 views

How may I mount a disk with a Apple / Mac partition table (APM) in Linux?

I've backed up some files from a old Powerbook G4 (AluBook), and I used the Mac Partion manager or whatever to first initialize the disk. It worked, originally, as one large volume, and I copied ...
5
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1answer
3k views

IPsec in the Linux Kernel

I have some issues (questions) related tot the Linux Kernel implementation of IPsec and it's user-space interface. The biggest question is which is the actual official project for the Linux Kernel ...