Everything about UNIX kernels: development, configuration, compilation, design, etc.

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Java programs hang, unless pinned to single core

I'm having issues with java applications being completely unresponsive unless I pin them to s single core. The strange thing is that I'm using the exact same configuration on two different machines ...
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Linux Userspace PCI driver options? (uio_pci_generic)

I have a Xilinx FPGA PCIe end-point on the PCI Bus. Linux picks up the device just fine and everything in lspci looks perfect. My question is about PCI access options from user-space and what would ...
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Linux Device Drivers 4th edition [on hold]

There is an information that Linux Device Drivers 4th edition is available for preorder. However, I've failed to find table of contents or any specific information. Does anybody know will open ...
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Increasing Kernel Mode Setting (KMS) scrollback buffer size

I'm using Kernel Mode Setting to set my server's tty resolution. I added GRUB_GFXMODE=1280x1024x24,auto to /etc/default/grub, and GRUB_GFXPAYLOAD_LINUX=keep was already there. There's no vga= or ...
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Unable to install new kernel in ubuntu server. “gzip: stdout: No space left on device” error even though abundant disk space

I am trying to install a new kernel on Ubuntu Server and I am unable to complete it due to a "gzip: stdout: no space left on device" error. The full error was produced after running sudo make ...
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1answer
25 views

Understanding the relation between FreeBSD kernel configuration file and actual device

To my understanding, FreeBSD's kernel is configured via text files. Each kernel configuration entry is on a single line. Many entries also have comments set off with a hash mark. The GENERIC conf. ...
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How do i apply this patch to my current kernel?

i am trying to install this patch to my current kernel /usr/src/linux-headers-3.19.0-25 in order to use the gspca module for a keychain camera device. i tried running patch command and the result ...
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26 views

debian testing hangs on wakeup from s2disk / hibernate

My machine (ThinkPad x230) hangs on wake up from s2disk or s2ram after a recent aptitude safe-upgrade.† The hang looks like a blank screen with a blinking cursor in the upper right after loading data ...
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Uboot pass arguments to kernel!

How uboot can pass command line argument to kernel? I did some googling and got to know that it uses bootargs environment variable.There it was mentioned that setenv bootargs key=value.Since I am ...
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CONFIG_NF_CONNTRACK is not set

I am trying to setup iptables on udoo quad but I hit a brick wall and cannot find a fix anywhere: root@udoo:/# uname -a Linux udoo 3.0.35 #10 SMP PREEMPT Wed Jul 30 18:16:10 CEST 2014 armv7l ...
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How to get the name of USB driver in use in linux

I'm running Ubuntu 14.04 on my laptop. I'm having USB related issues in my laptop. It works sometimes and sometimes doesn't. I thought of fixing the issue myself. So, I wanted to know if there is a ...
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grub2: error: /vmlinuz-3.16-ucs109-amd64.efi.signed has invalid signature

I am using a derivative of Debian, called Univention Corporate Server. It's a nice appliance that I use for my home server. Yesterday I upgraded to the newest version and since then my server does not ...
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33 views

Option to configure Linux kernel to run userspace script when core dump occurs?

Is there any option in the kernel compilation or userspace setting to do the above? I'm looking to add a crash reported to my new embedded Linux system.
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What could cause dropping cache to be extremely slow on a large cluster?

I'm attempting to time file I/O on my disks. In order to make sure all the I/O is happening off the hard drives and not from ram, before I time any read, I run a drop cache command. Specifically, I ...
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SLES official repository connection (activation code available for SLES 12, not SLES 11 SP3) solution: use SLES SP4

How could I connected to official repository from my SLES 11 SP3? I need to update my kernel etc. Here my previos active-search post =) How to get 60 day SLES activation code
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2answers
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How to call in a kernel level function in user space [closed]

I've developed some helper functions in the kernel. They're called by other functions in the kernel. Currently, they make my custom kernel panic :( For now (i.e. debugging), I made them as a passive ...
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40 views

What causes the ata exceptions in my syslog and how to solve them

I have a new system with debian (omv) a SSD hard drive for the OS and a software RAID 6 for the data. I only saw now that I have very regular exceptions in my syslog. I'm worried now, what could ...
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What does “kernel:NMI watchdog: BUG: soft lockup” followed by other errors mean?

I have my terminal always opened (Fedora 22), because all my work I do from there. Sometimes I search some info in browser or just have fun. After 20-30 minutes of browsing (browser starts not from ...
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Automatic solution to reduce Linux kernel package size at compile time

Are there automatic solutions to disable unused Linux kernel parts (in particular unused modules) before compilation to fasten compilation? A daemon, that logs used kernel functions (or modules) at ...
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Signing a module for prebuilt kernel

I am developing linux driver for my own PCI device. I have stucked up on starting my module: [14941.205599] mymod321: module verification failed: signature and/or required key missing - tainting ...
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Linux: Two differen drivers for two (mostly) identical PCI devices

for some obscure reason I want to use two different drivers for two identical PCI devices on the same system. The drivers have different characteristics, which is why I want one physical device ...
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How do I crash Ubuntu Linux 14.04 LTS deliberately?

I'm trying to crash an instance on AWS so I can simulate what happens when it gets 'stuck'. I tried the top suggestions here How to cause kernel panic with a single command? but unforunately they ...
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38 views

Does Parallels support 3.18.0-kali3-amd64?

I'm not able to find information on which kernels Parallels supports. I'm trying to figure out if Parallels 10.1 supports this kernel since Parallels Tools will not install no matter what I try. ...
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Opening/Writing to a file from a KProbe handler [migrated]

I am writing a Linux kernel module using Kprobes to trace specific system calls, and I need to write to a file from within a KProbe handler (specifically, a Kretprobe). I know this is generally not ...
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Use of MODULE_FIRMWARE(filename) macro in Linux modules

What is the use of the MODULE_FIRMWARE(filename) macro in Linux kernel modules?
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49 views

Empty kernel directory but kernel-headers are installed

Host - Windows 7 Guest - CentOS I am trying to install kernel-headers using yum since during the installation of vmware-tools I get a message asking for the path to the kernel header files for the ...
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How to debug a kernel panic on boot with archiso?

I have an iMac mid 2011 running OSX and I am trying to install Arch Linux following this guide. I successfully set up a dual boot last year following a similar procedure but now I can't even start ...
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How to Dtrace a newly added function to the Kernel [closed]

I'm on Solaris 11. I'm writing various functions which will sit in different places in kernel. I need to watch the value of their internal variables for debugging purposes. For instance, the following ...
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Why am I able to write a module parameter with READ ONLY permissions?

I wrote the following simple linux kernel module to test the param feature: #include<linux/module.h> int a = 5; module_param(a, int, S_IRUGO); int f1(void){ printk(KERN_ALERT "hello ...
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Linux fails with starting on a dualboot system after Windows update

I have Windows 7 and Kali Linux on my computer, normally I don't use windows anymore. But today I started windows and it updated itself. I am writing my thesis and all my stuff is in Linux so I really ...
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70 views

Kernel version not changing even though the new version is installed

Recently performed software update on a RHEL 6.6 (Santiago). Noticed that kernel version is not updated to latest one that was installed. kernel version before doing software update: [root@server01 ...
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kstat in Solaris 11+

I'm writing a kernel-level program in Solaris that monitors the workload of the system and reports the stats --something similar to netstats in linux and kstat in Solaris. Where the source code for ...
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Which module utilities are the conf files in /etc/modprobe.d consulted for?

Are the conf files in /etc/modprobe.d consulted only for modprobe command or are they consulted for other module utility commands such as insmdod, rmmod, depmod etc as well? I found it mentioned in a ...
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Advice on printing in kernel [closed]

What is general advice on printing in kernel level? Lately, I need to print out some internal variables in various places. However, I use a naive way using printfk to dump the stuffs I need in log ...
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File permissions for kernel have changed in OSX Yosmite, why?

I am working my way through the book Learning Unix for OSX Mountain Lion (I don't have access to the updated version for OSX), in which it demonstrates that using $ ls -l /mach_kernel should ...
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Significance of Linux kernel's default_console_loglevel

What is the significance of default_console_loglevel in Linux? Commonly I see it described as the default value of console_loglevel. However, what that means I haven't seen explained anywhere. ...
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123 views

To run modprobe for Wi-Fi at login

I would like to enable my wifi card automatically at the startup every time. However, the command below requires sudo. I see Hardware Disabled at the wireless connection which blocks the internet ...
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108 views

Where is the RHEL7 kernel source code installed?

I install the Linux kernel source code RPM: [root@localhost ~]# rpm -ivh kernel-3.10.0-229.el7.src.rpm warning: kernel-3.10.0-229.el7.src.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY ...
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Why doesn't the Linux kernel prioritize interactive programs?

I've noticed that when running at 100%, things like GNOME become less responsive until I kill background tasks that are expected to take a long time, like compilation or downloading email. Why ...
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How to change the console_loglevel in linux?

I read at multiple places (e.g. here http://elinux.org/Debugging_by_printing), that you can change the console log level by echoing an integer to /proc/sys/kernel/printk. If that worked shouldn't the ...
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Some questions regarding linux kernel external module build process

The Linux kernel documentation page for building external modules (https://www.kernel.org/doc/Documentation/kbuild/modules.txt) says this: === 2. How to Build External Modules To ...
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89 views

Where in the kernel /dev/kmsg gets initialized?

I'm trying to figure out at which point in the boot up process /dev/kmsg gets initialized and can thus be written. On my system the first line that occurs in dmesg is printk(KERN_INFO "Initializing ...
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28 views

Number of Threads in Kernel

How can I get the number of threads in the kernel at specific sampling rate? I need to measure the utilization of the system directly by myself.
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61 views

Why Gentoo detects no network devices? [closed]

I've faced the problem installing Gentoo: after the installation is seems to be completed and LiveCD is extracted, network becomes unreachable: gentoo~ # ping 8.8.8.8 connect: Network is unreachable ...
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332 views

Update kernel to 4.1.1 in Ubuntu Mini

I'm using Ubuntu Mini 15.04 and I want to update the kernel to the latest 4.1.1. I've been looking online but there are so many different ways. I've tried some but always ran into some error. I am ...
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Remove branding from custom kernel

I have an assignment to build a custom kernel which removes all the drivers/plugins that are not needed and also remove any traces that it is Ubuntu's. Basically, my teacher wants us to strip it down ...
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64bit Linux Mint on Dual Core Pentium 4 machine

I have a HP 530 desktop with a 3200Mhz Dual Core P4 processor, 4GB RAM and 1TB Sata HDD. I'm setup with Dual Boot Windows 7 and Linux Mint 17. Although Windows 7 64 bit loaded fine, Linux Mint 17 64 ...
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I installed linux. And it doesn't recognize usb keyboard and mouse

When I boot computer with kernel 2.6, I can use usb keyboard and mouse. But If I use kernel 3.10, It doesn't work. / / kernel 2.6 $ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 ...
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udev usb stick device list

we have 2 different yocto distributes. 1) ARM Kernel 3.10.53 2) X86 SMP Kernel 3.10.0 if we add a usb stick to the ARM system we get the different udev Messages. usb/usb_device usb/use_interface ...
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How kernel will get control from u-boot in linux and who will un comnpress the image

I am basically Linux BSP. I want to know how u-boot will give control to kernel in android kernel or linux kernel. And how uImage will get uncompressed.