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How to email kernel patches?

I am facing a trouble of submitting my kernel patch through email. I can't use git-email, it throws me error - The following packages have unmet dependencies: git-email : Depends: git (< 1:2.11.0-...
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9 views

Can't get modules in /lib/modules loaded during startup

I used to have an Ubuntu installed in an ARM (32 b). The drivers needed to run the system were copied in the folder "/lib/modules" and loaded during the startup. Due to a hardware update, I have ...
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1answer
25 views

segfault from dmesg + redhat linux

I see unusual info from the dmesg as the following: addr2line[207071]: segfault at 30 ip 1000543d41881 sp 00037fff87dd4420 error 6 addr2line[207089]: segfault at 0 ip 0200353455f8c9052e sp ...
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0answers
16 views

Yocto system lockup: rcu_preempt detected stalls on CPUs/tasks

I'm dealing with an intermittent lockup issue on an embedded Yocto system. (4.1.15-2.0.0). We have been able to, over the course of a few weeks, reproduce several times across several units but not ...
0
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1answer
15 views

Transferring Control between Kernel Images

As the title states, I currently have an existing bootloader/kernel image utilizing multiboot and GRUB. Appended to the end of my custom kernel image is the binary of Linux's bzImage. During the ...
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1answer
17 views

Do I need to take action regarding my Microarchitectural Data Sampling (MDS) status?

My dmesg output contains the following line: [ 0.265021] MDS CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html for more ...
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1answer
11 views

sysctl -a doesn't include log_buf_len

I hope to check the value of log_buf_len via sysctl, but sysctl -a doesn't show it, why and is there any other way to check its value
0
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1answer
25 views

How to replace kernel module in FreeBSD?

I am trying to get an LSI 9300 SAS HBA working in FreeBSD 11.2. I'm currently running driver 18: # dmesg | grep mpr mpr0: <Avago Technologies (LSI) SAS3008> port 0xa000-0xa0ff mem 0xfb300000-...
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1answer
31 views

How to reset the video mode of the Intel driver i915 for the kexec-ed kernel so I can see what kexec kernel is doing?

I'm running Arch Linux and I've set up kdump so that when the current kernel panics(or I manually induce a crash via sysrq+c) then another kernel(the kexec kernel) starts up in order to create a crash ...
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1answer
24 views

Systemtap can not resolve probe point although it is shown in probe list

I'm trying to debug netfilter synproxy module with systemtap. This is probe point I'm trying to add. # stap -l 'module("ipt_SYNPROXY").statement("*")' | grep send_client_synack module("ipt_SYNPROXY")...
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1answer
28 views

Does the Linux traffic control utility modify datagrams, IP packets, or frames?

I am using the Linux's traffic control (tc) utility, which to my understanding is used to configure the Linux kernel packet scheduler. I am also using the netem command in tc to add delay, drop, or ...
1
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1answer
38 views

If the kernel can sleep when handling a system call, how does execution return to the system call?

I am reading "Linux Kernel Development" by Robert Love and he wrote that the system call executes in process context and is capable of sleeping. The current pointer will refer to the current task, ...
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34 views

BUG: unable to handle kernel NULL pointer dereference at 0000000000000048

I had an issue for some time that my server was crashing without any recognizable reason. Yesterday I finally was able to "catch my server in the act" of crashing and prevented the logs from being ...
0
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0answers
10 views

Why my question was put on hold? [migrated]

I don't understand why my question was put on hold. I also replied to an email you sent earlier two days ago, but I have not received any response as yet. It did not allow me to attach a file even its ...
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0answers
24 views

Fresh Gentoo Installation - Kernel Panic

I recently installed Gentoo on my Toshiba Tecra A50-A-151. Unfortunately, I am getting a kernel panic when it boots. I followed the Gentoo wiki handbook (https://wiki.gentoo.org/wiki/Handbook:AMD64/...
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1answer
16 views

What's the kernel option to disable the kernel bootlogs appearing on the serial port?

I have an embedded device where uboot is passing the kernel command line options to set the serial port. I want to disable the kernel bootlogs appearing on the serial port. I can't change uboot or ...
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0answers
27 views

NanoPi NEO2 disable/blacklist audio

I have a NanoPi NEO2 on my hands, which is a neat little board. The board has analogue 3.5mm audio and HDMI audio (although I am not sure how to get that one as there is no HDMI connector). # aplay -...
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24 views

building glibc for old kernel

I configured build with this command and built it using make Now I'm trying to create deb package with this settings but i failed with this error FATAL : kernel too old how can i do it?
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0answers
18 views

Rebuild a Centos kernel from a Debian netboot

I have (had) a Centos 7 system running on a server at OVH, booting from hard disk. I did a kernel update, and being in too much of a hurry rebooted just after it looked like all went well. It didn't. ...
1
vote
1answer
31 views

SysRq doesn't display any result on terminal

I use Mint 19.2, and I try to see CPU backtrace by the following process. $ sudo -s # sysctl -w kernel.sysrq=1 # echo l > /proc/sysrq-trigger But, nothing happened. I researched more ...
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59 views

kernel crash: rcu_sched detected stalls on CPUs/tasks and NMI watchdog: BUG: soft lockup - CPU stuck

I have a server crashing almost everyday. It runs on Debian, kernel 4.9.0-8-amd64. Here are the logs written before the latest crash: Aug 14 02:21:24 server6 kernel: INFO: rcu_sched detected stalls ...
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1answer
20 views

Partition being mounted as read only after copy operations despite healthy disks

I have an ext3 partition that is made from a logical volume. The volume group (8 TB) is made of 3 PVs (1* 4TB, 2* 2TB). The ext3 partition is the only partition from this volume group. I mount this ...
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0answers
12 views

mmcblk mounted as 1 -> root=UUID fail finding rootfs

I just upgraded Linux kernel (from 3.10 to 4.14), and now mmcblk rootfs partition as mmcblk1 (while in the older kernel in mmcblk0). I would have assumed that things should yet boot correctly from ...
0
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1answer
22 views

externally supported module, setting X kernel taint flag

Does this mean a driver is not from the original OS-distributor, the kernel becomes a tainted kernel? What does 'X' mean? I didn't see an explanation for 'x' ref: https://www.kernel.org/doc/html/v4....
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0answers
224 views

Linux Mint 19.1->19.2 upgrade broke Cinnamon - driver issue?

Updating broke Cinnamon for me. I was on 19.1 Tessa, Cinnamon edition, and updated to 19.2 through the Update Manager. Now when I boot I get the message “Cinnamon just crashed. You are currently ...
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0answers
32 views

How does IPVS-NAT interact with iptables?

I'm using IPVS-NAT to do some load-balancing in Kubernetes (kube-proxy), I would like to understand when do IPVS's hooks get executed, I tried to read about this here: http://www.austintek.com/LVS/LVS-...
1
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1answer
32 views

Can't use ioctl() to control a device owned by kernel module?

I failed to use C/C++ to access the image sensor OV5645's register on my system via I2C bus. Below are some information about my system: Hardware: Dragonboard 410c + 96Boards MIPI Adapter with ...
1
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1answer
54 views

Why the rules I create in the iptables OUTPUT chain are deleted after a while?

I have a robot on local server that has the task of creating rules a number of times per day on remote server.The purpose of the robot is to calculate the traffic consumed by each port. Access to the ...
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0answers
28 views

How to know why oom-killer triggerd and decode the oom-killer logs?

Below are the logs :- [ 727.941258] kworker/u8:2 invoked oom-killer: gfp_mask=0x15080c0(GFP_KERNEL_ACCOUNT|__GFP_ZERO), nodemask=(null), order=1, oom_score_adj=0 [ 727.954355] CPU: 0 PID: 56 Comm: ...
3
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0answers
105 views

Fedora causes Thinkpad X1 Carbon Gen 7 to hang on reboot after “Restart and Upgrade”

I recently installed Fedora 30 on my Thinkpad X1 Carbon Gen 7. The installation went fine. On the first boot I went to the software center to check for updates. There were quite a few software and OS ...
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0answers
45 views

Auditd, syslog and journald

I have been investigating about these 3 logging solutions, but still there are thing that unclear to me. According to the things i read, auditd audits events in the kernel and it has very deep and ...
0
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1answer
26 views

Booting a flat binary from USB

Following along with online resources, I've created a multiboot ELF file, but used objcopy to create a "flat" binary or data file. The kernel image is simple, only printing "hello world" to the ...
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0answers
29 views

Identifying physical network devices using /sys/class/net/<iface>

I wanted to know if there is a way to differentiate physical and virtual network devices. ip a doesn't have an option. So I am trying /sys/class/net/<iface>. There are 2 attributes ...
1
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1answer
52 views

Unknown display + no sound on upgrading kernel to 4.18 (Ubuntu 18.04)

I am running a Dell Optiplex 7060 with Ubuntu 18.04 (dual-booted with Windows). The system only has Intel's iGPU (UHD Graphics 630) to which I have two monitors connected, and it uses the Realtek ...
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0answers
56 views

Unmet dependencies 'apt --fix-broken install' doesnt help due to Kernel Upgrade

I have a VPS where I run my test programs on it and I tried to install python3.6 which requires libc6 and due to "Kernel must be upgraded" error I can't install anything anymore. I talked with the ...
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0answers
15 views

'cat /sys/kernel/debug/pinctrl/INT*/pins' show not available

I want to do control over these GPIOs, but it shows those GPIOs are not available. ex: pin 4 (GBE0_SDP2) not available What's the problem? The possible driver source: https://github.com/torvalds/...
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0answers
53 views

acpi_themal_init takes long time during Linux kernel boot

dmesg | perl scripts/bootgraph.pl > boot.svg shows acpi_thermal_init taking up majority (80%) of kernel boot time. Furthermore, dmesg reports an unusually long delay between [2.947435] ACPI: ...
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0answers
24 views

How to set a large stty size?(default 80x24)

I'm really not sure where is the problem, so I'm putting all message i think helpful here. dmesg | grep drm [ 0.316388] fb0: switching to cirrusdrmfb from EFI VGA [ 0.316769] [drm] fb mappable ...
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1answer
28 views

Linux Local Tables

Could you help me understand the practical use of the "local tables" ( versus the "main routing table"), displayed with command : ip route show table rt_eno2 My understanding of basic routing is that ...
0
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0answers
26 views

How to reset the terminal cache in the same session properly?

Currently, I am benchmarking the running time of a package from the terminal. When I use a command with the same file repeatedly, running time was much less than the first one, and this made me think ...
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0answers
51 views

How to fix broken Debian?

These errors (see pic. 1 and 2) appear every time I boot in Debian. I tried to update from stretch to buster, but it didn't have any effect. I have dual boot with Windows 10, so that potentially might ...
1
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2answers
90 views

Yocto Boot2Qt Build for Colibri iMX6ULL no wifi interface

I have built the linux distro Boot2Qt from source with the yocto tools for the board Colibri iMX6ULL which has the integrated wifi chip Marvell W8997-M1216. I installed the whole linux firmware-stack ...
2
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1answer
67 views

What has happened to the package open-vm-tools-dkms in Debian?

It seems open-vm-tools-dkms was deprecated in Debian 9 (Stretch) and is no longer available in Debian 10 (Buster). What does this mean — is the functionality obsolete or has it moved to some other ...
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1answer
24 views

Booting on a x64 machine with BIOS?

I have a packard bell ze7 it's a x64 machine and it only has BIOS. Before I got it, I thought that's a non-existent combination... I'm building Gentoo by hand, my own initramfs, all that good stuff. ...
0
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0answers
16 views

How to compile kernel in XU4 (armv7l)? Error compiling kernel 4.14.127: “sha512_block_data_order” undefined

I'm trying to compile the 4.14.127 kernel for my XU4 obtained here (https://wiki.odroid.com/odroid-xu4/os_images/linux/ubuntu_4.14/ubuntu_4.14) as I need the USP/IP related modules and, unfortunately,...
0
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1answer
18 views

How to free up space after kernel compile fail - where are the extraneous stuff

I need custom patch my linux kernel so it can access the MacBook Pro (2018/2019) SSD for Ubuntu installation. Luckily, someone made a patch that seems to work. I have a second computer with a 1TB ...
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2answers
44 views

How to cause kernel panic by deleting a device driver (module)?

Is it possible to cause kernel panic by removing a device driver and then making a system call that uses that driver so that kernel goes in panic?
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0answers
42 views

Failing to load kernel module

So, I have just started going through Designing BSD Rootkits and I seem to have ran into a problem right away. hello.c: #include <sys/param.h> #include <sys/module.h> #include <sys/...
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0answers
31 views

Can I profile my application's access to physical memory?

I would like to profile how many times my app accessed specific physical memory addresses. For example, PFN | COUNT 0x000123 3 0x000124 5 ... Is there any profiling tool ...
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0answers
20 views

Kernel trace error in LFS 8.4

i have recently completed LFS 8.4. When i try to boot LFS from my USb stick, kernel display call trace and then crashes. Can somebody help me with this. The pic is :