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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How to stop jbd2 to release a device

In an AWS EC2 instance, we have multiple EBS volumes. When I try to detach any of them, the umount command works, but the device can't be detached. # grep -c xvdj /proc/mounts 0 However, lsof ...
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75 views

Stuck on GRUB command prompt after regular kernel update

I am running Debian Wheezy. Update Manager suggest to install kernel update. After update, I reboot system but instead of listing all the kernels (bootloader), it gave me a GRUB command prompt: ...
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1k views

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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0answers
62 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 ...
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2k views

Kernel data types u8, u16, u32, u64 not resolved

I am trying to compile some files related to wireless subsystem (mac80211) which use datatypes u8, u16, u32, u64. These are not resolved. The header file being referred to is linux/types.h which is ...
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898 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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603 views

How to change hdd read error timeout?

I'm recovering data from an hdd using ddrescue. With "retry" disabled, it takes roughly 30 seconds for every unreadable sector. The hdd has tens of thousands of bad sectors and the process is taking ...
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17 views

IPTables module ip_tables not found for root

We got a custom build Linux distribution from a vendor, which is not shipped with iptables enabled. root@xxxx:~# iptables -L modprobe: FATAL: Module ip_tables not found. iptables v1.4.21: can't ...
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9 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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60 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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13 views

linux-headers and images in ubuntu after installing vmware-tools

a noob question. Can I run dist-upgrade for linux-headers and images in ubuntu after installing vmware-tools? I ask this because i think vmware-tools also install something like a header and image ...
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54 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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17 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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29 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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115 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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210 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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828 views

What does this mean: considerRebuildOfPrelinkedKernel prebuild rebuild has expired

A line I accidentally spotted in system.log on MacOS X 10.9.1 when I connected an external USB webcam for the first time ever.... Subsequent connects to the usb port did not produce this message ...
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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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67 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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132 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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90 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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357 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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266 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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572 views

SELinux issues when adding rules

On my laptop I use Fedora 17 distro for the first time and I'm having some issues adding rules to semodule An example: # grep httpd /var/log/audit/audit.log | audit2allow -M mypol # semodule -i ...
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52 views

Swapping laptops while keeping current systems (kernel)

I am going to be getting a new laptop from HP soon, due to a faulty part, and they are giving my an upgrade. Almost all of the specifications will be changing, but I'm not keen on reinstalling my ...
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117 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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194 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 ... ...
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348 views

ARM Linux kernel debugging on AT91SAM9261

I have ported Linux to AT91SAM9261 board, I have compiled my own Bootstrap, Uboot, Kernel and filesystem. Now I want to debug my Linux kernel 2.6.30 using KGDB and GDB. I have host with Ubuntu ...
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2k views

Packet drop measured by ethtool, tcpdump and ifconfig

I have a question regarding packet drops. I am running a test to determine when packet drops occur. I'm using a Spirent TestCenter through a switch (necessary to aggregate Ethernet traffic from 5 ...
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24 views

Ubuntu 14.04 hangs at “[2.688088] Switched to clocksource tsc” (Intel Pentium 4)

I installed Ubuntu Server 14.04 on a Pentium 4 machine but booting the System hangs at: [2.688088] Switched to clocksource tsc I've tried all the Grub kernel bootoptions listed in this post: Linux ...
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12 views

kernel compilation fails at elf binary file on Mac 10.9

I am trying to compile rock chip kernel using "make -j4 kernel.img" and I get the following errors. SYSMAP System.map SYSMAP .tmp_System.map OBJCOPY arch/arm/boot/Image Kernel: ...
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9 views

Y-E DATA FlashBuster-U is not working with Ubuntu kernel

I'm using the latest Ubuntu kernel. And I can't use it at all I just get these buffer IO errors - usb 3-3: new full-speed USB device number 3 using ohci-pci usb 3-3: New USB device found, ...
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21 views

What is the relationship between /3GB boot flag, PAE kernel, LargeAddressAware PE flag and 36Bit Memory addressing in Windows 32bit?

After I read that Windows 2003 Enterprise 32bit support more than 4GB, I realize that the rest editions are being crippled even when using PAE kernel (ntkrnlpa.exe / ntkrpamp.exe). So could someone ...
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15 views

Possible kernel bug?

I found this in my dmesg: [10877.030980] ------------[ cut here ]------------ [10877.030987] kernel BUG at /build/linux-baBndT/linux-3.2.60/mm/mmap.c:2275! [10877.030993] invalid opcode: 0000 [#1] ...
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14 views

loading second vm in first one w/out rebooting by use of kexec

I've two CentOS virtual machines on my win8 host's vmware. I added one of the virtual machines to another by 'add hdd' of settings of VM. The versions of Centos is 6.4 i686. I installed kexec-tool on ...
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11 views

Can I install a higher version kernel template in VM/LXC Containers

I am reading up on LXC and related Docker . I have a few basic doubts . Is it possible to install a higher kernel version into a VM Does the same apply to LXC's ? I know I need to know what are ...
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20 views

How to apply a kernel patch from lkml?

How do I patch the kernel from a patch from lkml? Specifically this link : https://lkml.org/lkml/2014/5/9/517 I am running debian. I know how to roll a deb package, but I can't figure out how to do ...
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13 views

Is ramdisk_size still needed with a .cpio initrd?

I'm creating a rescue system with the following two files: rescue.linux (version 3.2) initrd.cpio The initrd.cpio file can be quite large, larger than the default 4MB of a ramdisk. However, it ...
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0answers
16 views

kernel configuration: select specific drivers or symbols regardless of dependencies?

Is there a way in "make menuconfig" et al. to start with enabling device drivers that you want included, and have it enable the necessary (dependent) generic options and APIs automatically? As it is, ...
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30 views

Fedora: Get a list of installed kernels by Date

I want to get a list of installed kernels in decreasing order on the date which they were installed. Any idea on how to do this? I am on Fedora 20
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41 views

make-kpkg: how to get the correct links in /lib/modules/$version/{source,build}

I'm using make-kpkg to build custom kernel packages (linux-image-.deb and linux-headers-.deb) that I then deploy to my other Linux rigs. The linux-image package created that way creates source and ...
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0answers
74 views

Updating kernel on a Chromebook to prep for Chrubuntu

Pretty simple question: I have read that by setting my Chromebook to the dev channel, it will install a later kernel. Currently it's 3.4.0, and it'd install 3.8.0 (64-bit, no less). However, after ...
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0answers
51 views

Testing Linux Kernel in QEMU gives black screen after brief text

I'm trying to run a linux kernel (version 3.14) I custom built using make menuconfig. I am trying to test it in QEMU and this is the command I am trying to run: qemu-system-x86_64 -kernel ...
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65 views

No COM1 port on hyper-v

I just made a fresh Windows 8.1 install and am trying to set-up a VM for kernel debugging. Therefore, I need to create a serial link to debug the VM using windbg. Usually I just simply add a new COM ...
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209 views

kernel panic: VFS: Unable to mount root fs on 03:02

I'm studying kernel compilation for my operating systems course. Unfortunately I'm compiling Linux v2.4.20 and Red Hat 9(yes, they're making us use it and it drives me crazy but I've NO CHOICE ...
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17 views

what do i do after editing a *.c file in the linux kernel

I have been having sound issues with the VT1802 AKA VT2002 I have copied over a possible fix into the file patch_via.c in dir /var/lib/dkms/oem-audio-hda-daily/0.201405052014~ubuntu13.10.1/build/ ...
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124 views

Windows equivalent of alt + sysrq + REISUB/REISUO

Is there a (kernel-level) Windows equivalent to the Linux Magic SysRq key combination REISUO/REISUB? i.e. Redirect keyboard to console Send a quit signal (non-forceful kill) Send a SIGKILL ...
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0answers
87 views

Mount Error (mount: page allocation failure. order:5, mode:0x40d0)

I am trying to mount mtd block on temporary file system(part of RAM). Some times mount command fails and below error comes in dmesg logs. Command: mount -t jffs2 /dev/mtdblock7 /temp/configuration/ ...
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0answers
20 views

How to tell which devices have been denied in a device cgroup?

In Linux Control Groups (cgroup), one can use the device subsystem to allow or deny access to device files. By default, all devices are allowed in the top-level cgroup. If I deny a certain device, by ...
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10 views

Output of usbmon ( length field )?

In http://www.mjmwired.net/kernel/Documentation/usb/usbmon.txt#163 it is written that before status tag ,there is data length field ,in my output for usbmon http://pastebin.com/b6U7Je7h please ...