The main component of most operating systems, the kernel manages most of a computer's communication between hardware and software. Typically, the kernel is the lowest level of abstraction a programmer can have to a resource.

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Perf samples too long, lowering kernel.perf_event_max_sample rate to

My machine freezes from time to time and I can get it working back by pressing the space key. I have this problem since two weeks now, but it was just once per day max. Now it's starting to be many ...
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61 views

How to generate soft lockup in Linux Kernel and how to verify?

I was testing soft lockup recovery procedure of Linux Kernel. I set /proc/sys/kernel/softlockup_panic to 1. And I created a Kernel module as described in the link below. https://github.com/saiyamd/...
2
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0answers
154 views

Kernel task memory is not released in Mac OS X 10.10 (Yosemite)

I was working on a large Illustrator project in Mac OS X 10.10 (Yosemite) which takes up 4.5GB+ memory but after I save and quit the application, my kernel task has still 4.8GB in it and not being ...
2
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0answers
182 views

crypto kernel module not avialable on linux 3.18.11 on Raspberry Pi 2

I'm trying to use dm-crypt on my Raspberry Pi 2 with Raspbian (debian) to open a trueCrypt volume, but i get Required kernel crypto interface not available. Ensure you have algif_skcipher kernel ...
2
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0answers
796 views

Windows 8.1 64bit Kernel-Power 137 Error

I'm at the moment encountering a problem with my windows 8.1 64bit Version. Some days ago I realised that it takes longer than usual to start the computer or wake it up, in fact, the computer seems to ...
2
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0answers
501 views

Kernel Panic from overheating?

I believe my CPU is overheating which is causing a kernel panic and the machine reboots. It is an Intel 3612QE. I have changed the cpufrequtils scaling_governor to ondemand, conservative, and also ...
2
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0answers
89 views

Y-E DATA PC Card Floppy Disk Drive (FlashBuster®/FlashBuster-U) is not working with Ubuntu kernel

Y-E DATA PC Card Floppy Disk Drive (FlashBuster®/FlashBuster-U) is apparently not working with—the latest—Ubuntu kernel. This floppy disk in it is Atari formatted. I just get these buffer IO errors. ...
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0answers
92 views

Making hardware profiles for Linux installation

So, I've got a ArchLinux installation on /dev/sda11, and I've imported it into VirtualBox using raw host partitions. Right now, I can boot it both directly and through VirtualBox. The problem is the ...
2
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0answers
975 views

Ubuntu Natty: 32-bit userland, 64-bit kernel?

I'm trying to manually install a 64-bit kernel for 32-bit Ubuntu. I have my reasons for doing so, but they're too complicated to explain here. Prior to Natty, this worked fine. Now, on Natty, I get ...
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33 views

PC crash Event ID 41 (63)

I played overwatch during open beta and for the first week or two after release with no problem, however now whenever I'm playing usually in the menus my PC will reset. My event viewer shows Event 41 ...
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36 views

Fedora 24: no build.include / try to generate autoconf.h

Trying to build a package which needs autoconf.h So i installed kernel-devel, ran make oldconfig and make prepare but unfortunalety it did not work Couldn't find any solution in the web, any ideas? ...
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42 views

Delete kernel module completely

I would like to ask you how can I delete some kernel module completely? I mean really delete, not unload or prevent to load. I tried to use rmmod, but it just unloaded module, same as modprobe -r. So ...
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138 views

Grub does not pick up new kernels (was: How to update Fedora's kernel)

In a seemingly endless quest to get Vagrant working I am trying to update Fedora. Vagrant needs VirtualBox, VirtualBox needs kernel sources, and kernel sources are only available for the latest kernel ...
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0answers
60 views

Updating the kernel on a Linux Mint Live USB

I'm following this guide: https://community.linuxmint.com/tutorial/view/1784 to update a Linux Mint ISO. Specifically, I'd like to update the kernel of this version of Mint to 4.4.8. For kernel ...
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22 views

How can I reserve hotplug bridge's memory only for prefetchable memory using the Linux kernel command line?

I have been trying to reserve more bridge memory for PCI hot plug devices using the kernel command line option 'pci=hpmemsize=256M,realloc'. This ends up causing an issue for non-prefetchable memory ...
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66 views

BCM4331 Installation issues on FreeBSD 10.2

I have been unable to find the 'right' 64-bit XP drivers to use ndisgen to create a working module -- I can get it to recognize the card but it has exit errors there are always IRQ and memory leak ...
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61 views

Sleep and restart issue related to registry or BIOS

I have been looking all over the internet for about half a year now.. Before: 1. Installed many antivirus programs 2. sucked (AVG) so I uninstalled it 3. AVG gave me MacAfee AntiVirus while ...
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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 ...
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84 views

kswapd uses 100% of one core, no swap in system. Possible _raw_spin_lock kernel bug. No solution for long time

Sometimes kswapd0 uses 100% of one core. This issue happens during all 4.0+ kernels. drop_caches didn't work. Adding swap didn't work. There is no rule when problem appears. It can wait 1-2 weeks. It ...
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0answers
29 views

welcome to emergency model

After I change the disk partitions and reboot I get this message and can not enter system normally. /dev/sda1 * 2048 10487807 10485760 5G c W95 FAT32 (LBA) /dev/sda2 10487808 ...
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155 views

Linux kernel AVX2 support

I would like to know when was the Linux kernel modified to incorporate full support for AVX2 instruction sets. I have tested some software using AVX2 instruction set that someone else claims is 20% ...
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634 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: ...
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422 views

Ubuntu 15.04 kernel panic — not syncing attempted to kill the idle task

I just purchased a Lenovo W540 workstation with the following specifications: CPU i7-4810MQ (quad core) 32 GB RAM 2 TB SSD storage capacity Nvidia Quadro K1100M 2GB graphics card. Windows 7 Pro OS I ...
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57 views

How can I understand what happens to my laptop?

I'm running Ubuntu 14.04 LTS which was recently upgraded to 14.04.03. With that upgrade came a new kernel (i.e. 3.11.0-18-generic) that breaks my X server. If I select a previous kernel version (i.e. ...
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355 views

Where to get the kernel source directory Kali Linux

This is a branch off of this question: Installing new driver on Linux, missing the 'Build' directory Since the PC has no internet I can not use apt-get to rebuild the kernel and get the ...
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0answers
62 views

Kernel parameter to set framebuffer resolution

What is the parameter to set framebuffer resolution (1920x1080)? With a nouveau driver I didn't have problem with it - now I'm using nvidia (non-free)
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0answers
155 views

Embed initramfs into existing kernel

Is it possible to embed an initramfs image into existing kernel without recompiling the whole thing? I don't have resources to do that.
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0answers
116 views

What exactly does acpi_backlight=vendor do

I have an issue when booting Linux with a device plugged to USB 3.0. If there is anything plugged (USB stick, keyboard, …), the system hangs on start with blank screen and does not react even on SysRq....
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2k views

How to understand and debug USB issues with Linux

I’m having an odd problem with a cheap "reverse USB hub" —not sure what the technical name might be— named a Tek Republic TUS-200 USB Sharing Switch. it has one USB port for devices, and ...
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0answers
23 views

Restore [non-boot drive] root directory from kernel image

Accidentally overwrote the root directory on a 2nd drive, .. but the subdirectories are still there [i.e. cd to a subdirectory drive is successful]. Problem is, the root directory in the partition is ...
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0answers
50 views

ethernet port is not detected in freescale MPC8569 board after kernel updrade

I have a freescale MPC8569 embedded board. previously, I put linux version 2.6.32 on it and all interface connected to processor are working properly. Now, I upgraded my linux version to 3.10 and now ...
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52 views

Is BIOS/UEFI used after OS startup?

I know that BIOS/UEFI is used during computer startup to boot the system and check HW and that it provides abstraction over hardware Does this mean, that the OS kernel calls BIOS/UEFI layer when the ...
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0answers
131 views

Computer froze with black screen when viewing (not editing) video card's memory in Cheat Engine

I was looking at my computer's physical memory in Cheat Engine (a memory editor/debugger application) and I decided to look at the addresses that Device Manager says are used by my video card. When I ...
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0answers
225 views

How to keep Linux kernel responsive while having high memory usage?

Sometimes I have a lot of programs running and despite of 16GB 8GB of memory my ubuntu linux 14.04 LTS turns out to be not responsive at all. I won't be able to get a TTY to kill some processes to ...
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0answers
188 views

Thinkpad Yoga “Disk I/O Error” (Linux)

My machine is sporadically remounting the SDD readonly due to a "Disk I/O Error". This seems only to happen when I connect to the laptop to a power source or after resuming from suspend. The SSD ...
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0answers
27 views

PCI configuration method error (Linux Kernel)

(I'm not sure if here is the best place for that question, so I will be pleased if anyone suggests me a more proper forum for that.) I'm trying to install Ubuntu 12.04.4 in a netbook (from an usb), ...
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0answers
390 views

Debugging linux kernel, SIGKILL

Trying to debug linux kernel (vmlinux) with gdb during my education, but after I run kernel I just got "program terminated with SIGKILL": gdb vmlinux-3.11.0-12-generic ...GDB header... Reading ...
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0answers
45 views

Debugging not-loading Windows XP x64

The question is related to this one: Windows XP x64 hangs at welcome screen. So I want to debug WinLogon.exe through Windows Kernel-Debugger remotely using an 1394 (Fire Wire) port on the system asked ...
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0answers
664 views

Syslogd: hardware error

The machine has been sending these messages to the terminal, paired with beeps from the speaker on the motherboard. These messages appear every 5 minutes, sometimes naming CPU2, sometimes CPU3. ...
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0answers
677 views

how to resolve kernel_security_check_failure

I am trying to re-install my Nokia-E5 software by Nokia suite ,I have windows-8.1 OS on my laptop , I am getting this error kernel_security_check_failure . And my laptop restarts. I have no idea how ...
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0answers
7 views

How to approach searching for sources of interface unresponsiveness

On Debian Linux: On a relatively powerful machine I ran an update and both the kernel and the window manager got updated to newer version. At that point the machine become noticeably less responsive: ...
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0answers
145 views

linux + squashfs-tools for red-hat 5.3

I want to install the squashfs-tools-4.0-5.el6.i686.rpm But I have the following dependencies ( after RPM installation ) please advice what the additional packages that I need to install on my linux ...
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0answers
141 views

Linux kernel 3.9 new storage features howto?

Linux kernel 3.9 has been released, which brings new features for storage cache devices (dm-cache), as well as BTRFS RAID 5/6. These features are undoubtedly sexy, but are all but completely ...
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0answers
185 views

-kernel option like in QEMU for BOCHS

I am working on creating my own kernel using C/Asm. I have always used QEMU as my emulator mainly because I can specify -kernel and it boots the kernel directly without a boot loader. I wish to switch ...
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0answers
533 views

How to find whether setcap is supported in Linux

I have a libpcap based application. Now, to allow non-root users to use my app, during installation , i use setcap setcap cap_net_raw=ep /bin/myapp But, in case the Linux Distro on which i install ...
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0answers
499 views

USB Mass storage driver as CDROM in Windows & MAC

I am in the process of enumerating a Hybrid ISO image which will show up as CDROM in Windows & MAC and encountered with the following problem. Hybrid ISO image is created with the following ...
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0answers
377 views

How to find out the available (and used) user resources?

With ulimit, we can find out how many open files, running processes etc. at most the user can have at the same time. My question is: how can we find out how much of these limits are being used and how ...
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0answers
122 views

Ubuntu alternate install CD kernel modules

I'm using Ubuntu alternate install CD to customize the installation process. I have a hardware that uses Realtak 8188CE chipset for wireless network. If I boot into a LiveCD environment I can connect ...
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0answers
143 views

How to make ^T work for the status char under Linux?

I’ve grown really accustomed to the BSD status char, ^T, since I first started using it back at university during the 80s. It didn’t originate with BSD, but came from even older operating systems. It ...
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0answers
267 views

Syslogd kernel:code:

While running some experimental Java code which interacts with a MySQL server, I received these messages and then the server crashed: Message from syslogd@localhost at Jun 20 20:04:12 ... kernel:...