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

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Detach keyboard from the kernel

I am writing a remote controller app for an octocopter and want to use a keyboard as an input device for this app but I don't want it to have any effect outside this app. Somehow I would like to make ...
6
votes
2answers
250 views

Location of the kernel binary (when not in /boot)?

I failed to find the kernel binary in the standard location in /boot. I've also searched the whole file system for vmlinux or bzimage find / -iname vmlin* find / -iname bzimage However, this is an ...
0
votes
1answer
164 views

How to run just linux kernel in vmware?

I am VERY new to Linux and am wondering if you can just boot the Linux kernel by itself or does it absolutely HAVE to be apart of an operating system. My reasoning behind wanting to do this is so that ...
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0answers
257 views

Computer wont boot with any media after installing wine on Ubuntu 13.10

Yup. I can boot into anything (meaning the os part), like a cd/dvd, a live usb, or the os on the HDD. i can boot into the first screen, which i think is called the grub selection screen and whatever ...
2
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0answers
115 views

How can I automatically include all firmware needed by selected Linux kernel modules

I have certain modules which I need compiled into the kernel. Some of these modules require firmware, which used to be automatically included from /usr/src/linux/firmware/. However, no new firmware ...
2
votes
1answer
274 views

How can I run gdb in one machine and run kgdb kernel in another machine?

I want to run two machine: debugged machine: compiled kernel with kgdb option. debugger machine: for running gdb How can I debug machine 1 from machine 2?
4
votes
2answers
552 views

How does udev get device numbers for the devices it creates?

Spun off from a small exchange in chat. One of the primary advantages of udev is that you don't have to worry about major and minor device number exhaustion anymore. But the devices created by udev ...
1
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0answers
168 views

IOMMU causing freezes, disabling causes USB to not work

I'm somewhat new to linux, but I'm running a Xubuntu machine that I recently built. Since I started it up, I had noticed frequent freezes, where both the screen (if plugged in) and any SSH session ...
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0answers
545 views

Qemu: No file system could mount root (unable to mount roofs)

In Linux, I've created the root file system (rootfs) by following commands: dd if=/dev/zero of=ramdisk.img bs=1M count=4 mkfs.ext2 ramdisk.img sudo mount -o loop ramdisk.img rootfs sudo cp init ...
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0answers
81 views

Kernel IPsec SA database: FIFO instead of LIFO

When processing an IP packet, the kernel looks into the security policy (SP) database to determine whether it is to be protected with IPsec. If the identifiers of the packet (e.g. IP addresses, etc.) ...
2
votes
2answers
634 views

How do I apply parameters to specific kernels with GRUB 2?

I have several kernels in /boot. One of them, linux-cc, is for heavy computation, i.e., 100Hz, no preemption, no graphics. I've created a systemd target, named compute.target, that only brings the ...
0
votes
3answers
5k views

CentOS kernel version 2.6.32-431.el6.x86_64 bugs

As far as I updated my centos ver 6.4 to 6.5, the new kernel (2.6.32-431.el6.x86_64) disappointed me! It hangs when I want to plug my external hard to laptop or hangs when I start virtual windows 7 ...
3
votes
4answers
3k views

Installing a cross-toolchain to build ARM binaries on Debian

I tried to install a cross toolchain so I could build Linux kernel on amd64 (Debian testing "jessie") for my ARM system. I have this entry in sources.list: deb http://www.emdebian.org/debian sid main ...
-4
votes
1answer
62 views

when update kernels do they close bugs?

I'm not an expert in linux but when I upgrade my kernel to latest stable one which is 3.12.2, does it close all security bugs? How linux security bugs be closed? by installing newer kernel or how ...
3
votes
1answer
357 views

Asynchronous and parallel algorithms in the Linux kernel

In the Linux kernel configuration, I see these options: config CRYPTO_PCRYPT tristate "Parallel crypto engine" depends on SMP select PADATA select CRYPTO_MANAGER ...
3
votes
1answer
173 views

Find kernel with specific commit

I have recently bought an Acer Aspire E1-572 with NetXtreme BCM57786 Gigabit Ethernet network card. The problem is that currently I cannot see it in ifconfig, but I can see it with lshw: *-network ...
15
votes
3answers
2k views

How to tell Linux Kernel > 3.0 to completely ignore a failing disk?

I am asking this question here in the hope that some Linux-kernel guru can have an answer. This question has been asked on AskUbuntu and on SuperUser without answers: thinking better, it is really ...
1
vote
1answer
134 views

How does the kernel know how much user addressable memory to set aside?

I was reading up on a rather-dated article on the kernel managing memory and had this question on where the Page Table Entries (PTE) would go into. For this example, the author assumes we are on a ...
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0answers
231 views

May have broken a Debian installation: 'sudo dpkg --configure -a' won't run

I did an apt-get upgrade on my Jessie vps, hosted by DigitalOcean. As many people know, DigitalOcean provides kernels from the host, rather than allowing the VM to boot from its own kernel image. ...
0
votes
1answer
2k views

bnx2: Can't load firmware file “bnx2/bnx2-mips-09-6.2.1b.fw”

I just compile the kernel 3.10.19 from kernel.org Support for bnx2 is enable. On my server when I try to start the eth0 interface I got the following error : bnx2: Can't load firmware file ...
5
votes
1answer
266 views

Know which directory is “mount -o bind” by asking the kernel (Linux)

If I do mount -o bind /my/dir /mnt/tmp, I can see the content of /my/dir within /mnt/temp. However, if I type cat /proc/mounts, I get the following output: /dev/sda7 /my ext4 ...
3
votes
3answers
8k views

CentOS boot time screen resolution

I'm trying to set the screen resolution in /etc/grub.conf using vga= on the kernel line: vga=788 I'm using CentOS 6.4. That command should set the screen resolution to 16bit 800x600 according to ...
1
vote
2answers
295 views

Is mainline Linux kernel capable of GPGPU programming?

The question is simple, is there general purpose GPU support in the Linux kernel? Let me explain in more details since it's too broad of a topic. By the word "capable" I mean native support. That ...
1
vote
1answer
325 views

system went unresponsive and had to hard reboot

without not much load on the machine, it suddenly went busy and went unresponsive. it could not respond to keyboard or mouse movement or neither would move to another other tty's. there is some log ...
4
votes
2answers
789 views

How does Linux md-RAID handle disk read errors?

There are 2 cases: the read command times out at kernel level (30 seconds by default), the drive reports its unability to read a given sector before the kernel lose patience (the case I'm ...
4
votes
3answers
93 views

Disallow File IO for a process except for FIFOs

How do you start a process that cannot do any file IO (opening / closing files, creating / deleting files, reading / writing files, etc.), except to read and write to pre-created FIFOs? (chroot will ...
1
vote
2answers
659 views

How to use netstat command

My question is what does it mean to LISTEN or ACCEPT on a port as it relates to my example? Example: I have a tomcat server, and It will use port 8080. I want to make sure that port is available for ...
3
votes
1answer
1k views

How to make EDID

I read the post here and I tried to make do with what I understood from the post but here are some questions: Where is the /lib/firmware located in for example /usr/src/linux/lib/firmware or ...
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0answers
45 views

Why linux is a monolithic kernel, while you can load/unload modules (e.g. drivers)? [duplicate]

Hybrid- and Microkernels are flexible, in the way one can add any higher-level functionality as a module, is it not the same for linux kernels? Why then linux is called a monolithic?
3
votes
2answers
220 views

what's the difference between machine hardware name and processor type

I know that my machine hardware name is i686 and processor type is i686 due to my Linux output. But I have no idea why they are the same. I want to know what's the difference between machine hardware ...
4
votes
1answer
515 views

ttyS1/uart1 initialised but not accessible through /dev/ttyS1

I'm not sure at which level I am having a problem. System is a LeopardBoard DM368 running TI's own SDK / LSP / BusyBox kernel, the core Linux kernel is 2.6.x so using serial_core.c driver model. By ...
2
votes
1answer
512 views

Know when a memory address is aligned or unaligned

Im getting kernel oops because ppp driver is trying to access to unaligned address (there is a pointer pointing to unaligned address). Im not sure about the meaning of unaligned address. It means not ...
2
votes
2answers
745 views

How can I purge old kernel packages in Elementary OS?

On my Elementary OS system, dpkg reports a number of kernel packages that aren't installed. (I did an apt-get purge on them previously.) I'd like to have them forgotten about entirely, but I can't ...
1
vote
2answers
1k views

error: “net.inet.ip.fastforwarding” is an unknown key

I've been doing some research into improving performance for OpenVPN and I found out about setting fastforwarding to 1 but when I tried I got the error error: "net.inet.ip.fastforwarding" is an ...
2
votes
1answer
2k views

USB 3.0 Device not enumerated on USB 3.0 Port in Debian 6.0 OS

I have installed Debian 6.0 OS (Linux kernel 2.6.32 )to test my USB Application as well as Driver. My USB device is working fine on USB 2.0 Port without any issue. But when i tried to connect the ...
1
vote
1answer
50 views

Why have a fake LR-WPAN driver?

In the Linux kernel configuration, a fake LR-WPAN driver can be enabled and added to the kernel that will be compiled. Why would someone want a fake LR-WPAN driver? I assume it would be for debugging, ...
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votes
2answers
86 views

Make a new sniffer [closed]

How can use the Linux-kernel to supervise what is going on, about the new connections, new ports, connected hosts? Like I will do a new sniffer. Which files should I monitor to know what is going ...
5
votes
1answer
90 views

Where would I start looking for documentation on the graphical mode of the Linux console?

I'm writing my own display server as an educational exercise. Where in the Linux kernel tree would I look for documentation on the console's graphical mode? Basically, as I understand it, Xorg takes ...
4
votes
1answer
277 views

Using kernel cryptographic functions

Is it possible to use kernel cryptographic functions in the userspace? Let's say, I don't have md5sum binary installed on my system, but my kernel has md5sum support. Can I use the kernel function ...
2
votes
1answer
385 views

Unable to boot using self built kernel

I built kernel 3.11.3 following the instructions here. There were no issues in the build. The steps I followed automatically made entries in grub and copied the image to /boot too. At boot time, when ...
2
votes
1answer
1k views

Broadcom Corporation BCM4313 WLAN does not work on installed Arch

I have a Broadcom Corporation BCM4313 WLAN Controller in my netbook. When I boot the Arch live ISO and set up the network with wpa_supplicant everything works fine. On the installed Arch I get the ...
3
votes
0answers
2k views

“Northbridge Error (node 0): ECC Error in the Probe Filter directory”

I've received an e-mail from a user worried that the following errors on one of his servers is indicative of a serious problem. The trouble is, the errors below are all that I have to go on. I ...
2
votes
0answers
56 views

Linux kernel API changes/additions

I'm trying to find a webpage or docs or XYZ that will allow me to see all the API changes/additions/removals between two kernel versions. I found http://kernelnewbies.org/LinuxChanges, but I'm not ...
3
votes
2answers
1k views

replace xen kernel with non xen kernel

I have a virtual appliance in Xen format (XVA) that I wish run to on another hypervisor (MS Hyper-V). What have I done so far: I have converted the XVA to OVF using XenConvert, this resulted in a vhd ...
1
vote
1answer
918 views

How to configure linux to output to monitor

I'm currently running a lightweight Debian distro on a development board from Compulab. I have to login to the system via serial port everytime. The system has graphical card and the driver is ...
8
votes
4answers
4k views

enabling numa for Intel Core i7

In Linux kernel, the documentation for CONFIG_NUMA says: Enable NUMA (Non Uniform Memory Access) support. he kernel will try to allocate memory used by a CPU on the local memory controller of the ...
8
votes
3answers
846 views

kernel: Namespaces support

I am wondering what exactly the “Namespaces support” feature in the Linux kernel means. I am using kernel 3.11.1 (the newest stable kernel at this time). If I decide to disable it, will I notice any ...
0
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1answer
78 views

Random bug in Linux

Some time ago, I remember reading an article on randomization in computing, and how random you can actually get a system to be. The article came about, if I'm not mistaken, because of some seemingly ...
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vote
2answers
1k views

Can anyone explain the output of mount?

I'm getting the following output when the mount command is executed. [root@]# mount /dev/sda2 on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type ...
0
votes
1answer
855 views

OS errors : kernel: EDAC k8 MC0: extended error code: ECC chipkill x4 [duplicate]

We noticed the server crashes with below errors. Not sure it is related to any defected piece of the hardware or totally not related to Server detail:Red Hat Enterprise Linux ES release 4 (Nahant ...