Questions tagged [linux-kernel]
Questions about Linux kernel and Linux kernel related topics eg. implementation details such as system calls, kernel customization, etc. For Linux user space topics which do not involve kernel details, [linux] or distribution tag are more suitable.
3,466
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How do we configure musb-hdrc driver?
I would like to use a USB gadget device (phone) as a host via configfs. After setting up configfs, no gadget is being set up on the host peripheral (phone). The init script executes with the following ...
- 345
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11
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ath11k_pci: failed to connect to HTT: -110
I have Qualcomm QCNFA765 wifi card.
I am using custom-compiled kernel 6.1.55 and I have ath11k_pci in the kernel, and all firmware files are loaded successfully. Yet, when booting, I see on the ...
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14
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What needs to be done, based on the following in order to successfully boot into the system?
Ran this command:
sudo fsck -fvy /dev/mapper/root_vg-home
Here's the output:
fsck from util-linux 2.30
e2fsck 1.46.5 (30Dec-2021)
fsck.ext2: No such file or directory while trying to open /dev/mapper/...
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16
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lilo: Fatal: raid_setup: stat("/dev/nvme0n1")
I have booted Debian Live CD, and I am trying to create lilo boot record on my disk
The disk partition is mounted as /mnt/root and has the linux kernel and /etc/lilo.conf:
boot=/dev/nvme0n1
root=/dev/...
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0
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12
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Hibernation does not find enough memory despite nearly zero swap usage
I'm trying to diagnose an issue related to hibernation. I'm on a Lenovo Ideapad (AMD) running Manjaro and kernel 6.1.53-1-MANJARO. When I attempt a hibernate, I'm constantly getting errors about not ...
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18
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eBPF vs verified Linux Kernel Modules
In what way is eBPF superior to a kernel module verified on the user-side?
I'm not disputing the value of verified code; both approaches would be fully statically verified.
Both approaches require ...
- 153
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24
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Linux reboots with no panic when booting SMP configuration from kexec
I'm working on a project involving kexec. I have it working on some of our hardware platforms. On one platform, I'm getting sudden reboots with no panic dump during SMP setup:
[ 25.219028] smpboot: ...
- 121
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1
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22
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Linux: Getting the kernel buffer size for a socket
I have a C application which receives a lot of data over a TCP socket. Is it somehow possible to get the kernel buffer size for that file descriptor / socket? I would like to know how much data is ...
- 203
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20
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CentOS Stream 9 image has predictable interface naming disabled
I'm using a qcow2 image from here.
Note the net.ifnames=0
cat /proc/cmdline
BOOT_IMAGE=(hd0,msdos1)/boot/vmlinuz-5.14.0-366.el9.x86_64 root=UUID=<uuid> ro console=ttyS0,115200n8 no_timer_check ...
mockitodorito
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156
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When and where are the standard in, out, and error file descriptors first opened in linux?
Where are stdin, stdout, and stderr (the fds) first opened? Is it the kernel that does it? And when and where are the symlinks /dev/std{in,out,err} made? Where is the code that does it?
I assume it is ...
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22
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Network bridge between Termux and Alpine Linux QEMU
I have an Android phone with Termux. Using Termux I downloaded Alpine Linux x86 QEMU.
The problem: Other devices on the network cannot ping and communicate with the Alpine Linux QEMU. So that's why I ...
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112
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Possible missing firmware nvidia while installing in kali linux
so i skimmed through Google but couldn't understand whats happening this keeps giving me error, somebody please help
W: Possible missing firmware /lib/firmware/nvidia/ga107/acr/ucode_ahesasc.bin ...
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4
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1
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247
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Why does my system heavily use swap when there are 86 GB of RAM still usable?
This is not so much a performance problem as it is a desire to understand what is happening and how it works. I have a system with lots of resources, including 128 GB of RAM. What I have discovered (...
- 4,354
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49
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How to debug a USB audio event that happens during boot?
I have a Topping D30Pro USB DAC which works (mostly) fine once logged in, but during boot (systemd), right around "Reached Target Sound Card", it starts outputting, what I'd have to guess, a ...
- 21
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21
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My Laptops internal mic is not Detected
I have tried the gnome version of both Fedora 38 and ubuntu 23.04 on my Acer Aspire 315-24p laptop with AMD Ryzen 5 7520u processor. Non of the OSes detect my laptops internal mic. My mic is nowhere ...
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226
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Package linux-headers-6.1.0-12-amd64 is not configured yet
I'm running proxmox host 8.0.4 on debian 12 - 6.2.16-10-pve
One of my LXC running debian 12 6.2.16-10-pve, cant do any apt use
If I try to install any package I got this error
dkms: running auto ...
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0
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45
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OpenSuse Tumbleweed: Booting to TTY1 console (no GUI)
After running updates or installations with Zypper, I sometimes reboot to find myself stuck in a console (tty1). The first time, it was directly after I installed VirtualBox. That time, I managed to ...
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1
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42
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Virtual COM port using only USB cable
I have seen that it is possible to connect two computers by USB cable and make a virtual ethernet bridge or something like that.
My question is, can we do something similar but configure the ...
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68
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Linux kernel build fails with sed: can't read modules.order: No such file or directory
I am trying to build Linux Kernel for the first time and I am facing below issue while trying to make modules_install
sed: can't read modules.order: No such file or directory
make: *** [Makefile:1483: ...
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1
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36
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Why does Linux needs both pid_max and threads-max?
I understand the difference between /proc/sys/kernel/pid_max and /proc/sys/kernel/threads-max. There's a good explanation at the answer to
Understanding the differences between pid_max, ulimit -u and ...
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30
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What does it take to update kernel from 3.x to 5.X on qualcomm fsm99XX small cells platform
As of now qualcomm fsm99xx is on 3.10.84. 3.10.84 is given by qualcomm after a lot of extensive changes. we are trying to update it to 5.10 without support of qualcomm (as they don't support any more)....
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1
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35
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Can (or could theoretically) a recent Linux OS handle the case of an old defective SSD drive only accessible in read-only? If that one holds the OS?
You've surely heard the warning: after some years of use, or a lot of data written to it, an SSD drive might be become defective.
One of its symptoms: it might become only available for read-only ...
- 1,373
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63
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Linux Ubuntu Kernel crash: python: Corrupted page table
My system configuration:
Processor: 12th gen Core i7 12700K x 20
16 GB RAM
Not installed external GPU (No Graphics Card). All the GPU is from the processor itself (on chip)
Motherboard: Gigabyte ...
- 101
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1
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42
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unable to boot kernel on A53 (devicetree?)
I am trying to boot a Linux kernel on an A53 cpu (inside a ZU5 from xilinx).
I have two hard. The first is a custom PCB with a ZU5. The second is the ZCU102 SDK with the zu9eg.
Here the boot log :
[ ...
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1
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47
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What is the console setting for kernel early_printk in Linux?
I am working on an embedded Linux (kernel-5.10.24), and I enabled the early_printk in kernel configuration to help my debugging kernel.
Normally, the kernel command line has set console=ttyS0,115200 .....
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1
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56
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To create a Linux RT real-time system, which functions in the kernel should be cropped out?
I am customizing a Linux real-time system using the Linux 6.4.0 kernel and patch-6.4.6-rt8 patch. When running make menuconfig, which configurations should be turned off to improve real-time ...
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28
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Why can't you compile Linux kernel with GCC -O0 flag? (HugeTLB breaks?)
# CC kernel/fork.o
gcc -Wp,-MMD,kernel/.fork.o.d -nostdinc -I./arch/um/include -I./arch/um/include/generated -I./include -I./arch/um/include/uapi -I./arch/um/include/generated/uapi -I./include/...
- 11
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55
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AMDGPU doesn't work with hashcat
AMDGPU doesn't work with hashcat, anyone knows how to fix this problem?
$ ~ hashcat -I
hashcat (v6.2.6) starting in backend information mode
clCreateCommandQueue(): CL_OUT_OF_HOST_MEMORY
OpenCL Info:...
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15
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Unable to use blktrace
Trying to run below command: blktrace -d /dev/sda -o -|blkparse -i -
Below error is seen:
BLKTRACESETUP(2) /dev/sda failed: 25/Inappropriate ioctl for device
Thread 0 failed open /sys/kernel/debug/...
- 749
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1
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38
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uname -r showing linux-image version that is unsigned
My boot menu was full and then I tried to purge some older version of linux kernel with sudo dpkg --purge linux-image-... command. As initram-fs wasn't throwing error again and again I also tried some ...
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15
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Unable to mount from a script using shebang (kernel hardening related ?)
I stumbled across a really weird issue with mount. I'm unable to make sense out of it.
For some context, I wrote a Python script that aims to automount hot-pluggable USB devices, but this is not ...
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70
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How to drop the contents of the block cache of a partition/drive in Linux?
(Moved from Stack Overflow.)
I have a simple backup process that copies a bunch of files to a USB flash drive. I want to verify that copying was successful by re-reading the flash drive and comparing ...
- 111
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2
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51
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Why can't keyboards be used in customized linux?
I am customizing a Linux system using a Linux kernel of 6.4.0. After booting, why is the keyboard not working? # 1. The disk is externally connected through a USB interface. If I enter the Linux live ...
- 101
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64
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Why do_exit() undefined?
I was building a kernel module for trying kthreads. A thread function after doing its works exits by calling do_exit(0).
But when I am trying to compile the module, it is showing the error that ...
- 193
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27
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What is wrong with the recognition of this HID device?
I have a Panasonic CF-31RECAXDR Toughbook with 6.3.0-kali1-amd64.
(https://linux-hardware.org/?probe=2c021f93de)
Kali does not recognize the HID device Fujitsu Component Limited USB Touch Panel, no ...
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2
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39
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Leftover kernel directories with files
Why there are Kernel leftovers and can I get rid of them automatically?
There are so many kernel directories after a few months, that I get annoyed with it.
I just carefully inspected the /usr/lib/...
- 27.8k
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46
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How do I write a kernel driver for a custom partition table format?
I have a number of hard disks that use a proprietary partitioning system. The disks don't contain partition tables themselves, but each have a known number of partitions at fixed positions with fixed ...
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Memory protection keys: Exception handler crashes if pkey0 is write-disabled
Background: in-process isolation based on memory protection domains in x86/linux using memory protection keys (MPK) and the protection key register PKRU.
Setup: The program first executes ...
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2
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42
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Why does ftruncate with a shared memory object not use memory?
I've observed that I can create a shared memory object and give it ostensibly any size with ftruncate, regardless of the resource limits on my system. The code below sets the size to 262 TB, and ...
- 115
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Stopping all sounds before freezing, restarting after wake up
In the last few days I took the habit to leave alsaplayer looping. On freezing, it stopped; on waking up, it resumed... for a few times. The last time it didn't resume. dmesg was showing ...
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1
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388
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Can loop devices be automatically cleaned up when a process exits?
I'm trying to figure out a clean and safe way to use loop devices inside of a build script. To the best of my knowledge loop devices are required if you want to (GPT) partition and (FAT32, EXT3) ...
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108
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Removing old kernels seemingly removed graphics driver, is it safe to reboot?
Removing old kernels seemingly removed graphics driver, is it safe to reboot?
While doing a routine sudo apt upgrade, I received a No space left on device error. It turned out that kernels kept ...
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62
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Linux OS bootup sequence with systemd - what are the exact correct steps?
It would be really great if someone can confirm that the below steps are correct.
I would like to know the exact correct steps.
Power ON the computer.
Basic I/O system (BIOS/UEFI). The first program ...
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1
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71
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No rule to make target `scripts/extract-cert' when building Linux Kernel - Centos 7, devtoolset-9
I'm trying to debug my build environment for compiling a linux kernel with some patch sets.
I installed devtoolset-9 in my CentOS 7 environment to satisfy the minimum gcc version requirement of the 5....
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1
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105
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modprobe: ERROR: could not insert 'efivarfs': No such device
when I run efibootmgr command:
efibootmgr --create --disk /dev/sdb --part 1 --loader /EFI/syslinux/syslinux.efi --label "Syslinux" --unicode
I get this error:
EFI variables are not ...
0
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0
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74
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How to install and update specific Ubuntu kernel version
I have a 22.04 LTS Ubuntu server with 5.15.0-60-generic kernel version. I want to update my kernel version to 5.19.0-38 using CLI. Most of the people online use mainline repository for their usage. ...
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1
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99
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make menuconfig hangs when trying to compile linux kernel 6.1.44
I am trying to compile linux kernel 6.1 on Debian 12.
I have installed the build environment:
apt-get install build-essential bc libncurses-dev libssl-dev libelf-dev bison flex
Now when I run make ...
0
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1
answer
27
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Building Kernel for Debian on another Machine: GRUB: Out of Memory
I to an evalboard for Intel Elkhartlake.
The problem is the Plattform is not really a productive one.
It tends to get hot, has only a 16GB CFast Storage Card and 1 GB of RAM.
I installed a debian ...
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105
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Building a Debian install image with a custom kernel using a Debian Live Build
I am trying to create a debian install image using a live-build tool.
But during installation, the custom kernel I added is not used.
I am trying to create a debian install image using a debian live ...
- 11
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0
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64
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Unable to disable the "INFO: task kworker/u8:3:116 blocked for more than 120 seconds" when booting Ubuntu on QEMU
I have a emulation hardware device which can take more than 120 seconds to run when booting.
I always got the following messages:
[ 242.914490] INFO: task kworker/u8:0:9 blocked for more than 120 ...
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