Questions tagged [kernel-modules]

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RockyLinux: unable to load cifs module

I have installed RockyLinux 8.5 and am trying to mount a directory via cifs. I get the following error message: # mount -t cifs -o user=<remarked>,domain=<remarked>,password=<remarked&...
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1answer
262 views

BTRFS on RHEL8 - compiling kernel module or making userspace tools work

Context I recently installed RHEL 8 without realizing that it no longer supports BTRFS. Unfortunately, I have 4 disks in BTRFS RAID10. I don't have enough space on my other disks to hold the data ...
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0answers
69 views

How to find out which kernel module opened a socket?

When I try to find the process for an opened socket using e.g. ss I get the following output: ❯ sudo ss -tulpen Failed to open cgroup2 by ID Failed to open cgroup2 by ID Netid State Recv-Q Send-Q ...
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1answer
50 views

Linux module load

I have one question one of my Linux box which is RHEL 7.8 the module joydev is loaded on one server but not on the other server. Server A => Module joydev is loaded successfully Server b => ...
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1answer
62 views

kernel BUG at ./include/linux/skbuff.h:4470 leads Server to Hang

Server with linux version 5.5.0-050500-generic and OS version Ubuntu 20.04 LTS I have two interface which are connected to ovs bridge. As per normal flow packets are redirected to one interfcae to ...
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0answers
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Linux kernel version with (uname -r) does not show distribution version, where can I get the kernel source for this kernel?

I'm trying to compile a specific kernel module for my linux machine running on a hosted dedicated VPS. The VPS instance is running Ubuntu 20.04 64bit. In order to get the source code for the kernel I ...
1
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1answer
15k views

iptables kernel module missing after upgrade from Ubuntu 18.04 -> 20.04

After a release upgrade from Ubuntu 18.04 to 20.04 (focal), the iptables kernel module is missing: root@server:~# iptables -L modprobe: FATAL: Module ip_tables not found in directory /lib/modules/5.4....
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0answers
300 views

RTX 2070 + Fedora 31: nvidia_modeset error freezes computer just before login

I'm experimenting an error -which I'll describe next- with the following Linux system: Fedora 31 - kernel: 5.5.17-200.fc31.x86_64 GPU is ASUS RTX 2070 SUPER with drivers 440.82, also CUDA 10.1 and ...
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1answer
1k views

Getting network UNCLAIMED in Debian 8.3

When i check for lshw , i get following result user@user# lshw -c network *-network description: Ethernet interface product: I210 Gigabit Network Connection vendor: Intel ...
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1answer
103 views

Is buddyinfo valid in virtual machines

Buddyinfo shows number of contiguous pages for each order available. Since virtual machine treats host's virtual memory as its physical memory does any kernel module allocating higher order memory ...
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1answer
161 views

Unable to print the message sent from user space C application to Linux kernel module

I have developed a simple Linux kernel module : #include <linux/init.h> #include <linux/module.h> #include <linux/fs.h> ssize_t exer_open(struct inode *pinode, struct file *pfile) {...
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1answer
1k views

selinux blocks unconfined service from loading kernel module

I have a daemon running as unconfined_service_t SELinux type, on Redhat Enterprise Linux 8: # ps -eZ | grep savd system_u:system_r:unconfined_service_t:s0 693 ? 00:00:00 savd It is trying to load a ...
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2answers
94 views

What do the modified times under Debian's /sys directory mean?

Earlier today I did a full system image restore from backup. Shortly thereafter when I ran: # find / -type f -printf "%TY-%Tm-%Td %TT %p\n" | sort -r I noticed the files under /sys directory had ...
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0answers
95 views

How to load ip_nat_pptp module in ubuntu?

How can the module ip_nat_pptp can be loaded in Ubunutu 18.04.2 LTS ? I need this to allow PPTP VPN passthrough.
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0answers
53 views

nft_connlimit on RHEL 8 kernel 4.18

Does anyone know what happened to nft_connlimit module on RHEL 8 for nftables? This should be available from Kernel 4.18 onwards but cannot find it anywhere in the available kernel modules. Because of ...
2
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1answer
548 views

ZFS not installed into upgraded kernel (4.19)

I want to use the latest kernel (currently 4.19) with Ubuntu Server 18.04, and I also want to use ZFS. Although ZFS appears to install correctly, it apparently does not get installed into the right ...
3
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1answer
755 views

How to keep custom kernel modules on kernel updates installed?

I've got a NIC (Asus XG C100C) that is not properly supported in the current Linux kernel. Hence, I installed driver which I compiled from source. Every time when the kernel is updated, I have to ...
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0answers
344 views

RedHat 7.6\8.0 and LSI SAS 2008 controllers

Starting with versions 7.6 \ 8.0beta, RedHat has disabled support for SAS controllers on the LSI SAS 2008 chip. However, in Fedora 29 with the kernel 4.18, the controllers work. So, RedHat simply ...
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1answer
148 views

linux: truecrypt/veracrypt/luks/etc without /dev/loop*

I'm using a linux system without any /dev/loop* devices and without the loop module compiled into the kernel, and I don't have the option of upgrading the system or kernel. I want to use luks, ...
1
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1answer
623 views

module be2net not loaded with define parameter in /etc/modprobe.d/

I want to load the be2net module with the parameter rx_frag_size set to 4096, the default value being 2048. As specified by the documentation I created a file /etc/modprobe.d/be2net.conf with the ...
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1answer
70 views

How can I determine which kernel module is responsible for a specific connection showing in NetHogs?

I currently rent a dedicated server from OVH, and I was looking at nethogs to see how much connection capacity a specific process was using. I ended up, however, finding a slew of processes there that ...
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0answers
447 views

Package dependency issue, not sure safest way to proceed

I am running into a package dependency issue. Can someone help make sense of how to resolve this? Q What steps do i need to take when it says Requires: zfs-kmod = 0.7.7 Available: kmod-...
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2answers
718 views

Cannot Install mac80211(_hwsim) module on GCP Ubuntu 16.04 instance

I am new to GCP services and try to deploy mininet-wifi script to the cloud. On physical machines the installation described in the link and the SDN python script work pretty fine. However, for some ...
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1answer
910 views

How to prevent useless kernel-modules from loading?

Our Ubuntu-servers all seem to have various unused kernel-modules loaded wasting RAM and, in the case of jfs for example, running a bunch of useless processes (jfsCommit). I can use rmmod to get rid ...
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1answer
2k views

RHEL7.4 and DRBD 9.0/8.4 Installation

I have a fresh RHEL7.4 Server installation on which I'm trying to install DRBD 9.0 from elrepo. My server is running the latest kernel: 3.10.0-693.1.1.el7.x86_64, yet kmod-drbd90 wants to install ...
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3answers
16k views

UDP traffic not forwarded from Docker containers -> Docker host

I have a docker container and I am unable to run DNS lookups from inside containers, although it works fine from the docker host. The configuration management code that builds the Docker host is ...
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1answer
686 views

How to configure the st kernel module for LTO-6 tape drives?

I found a hint to configure the st module in a mail from 2004 redhat mailinglist about a slow LTO-2 drive. modprobe st buffer_kbs=1024 max_buffers=128 max_sg_segs=128 blocking_open=1 Are similar ...
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1answer
638 views

What are the benefits of enabling Enhanced Networking for EC2? [closed]

EC2 seems to provide a mechanism to enable Enhanced Networking for certain EC2 instance types. However, the use cases and benefits are not clearly spelled out? What are they and when is it ...
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2answers
8k views

Failed to find Linux Kernel Module

I`m trying to add driver for specific hardware at startup. Module file is located at /lib/modules/4.4.0-66-generic/kernel/drivers/misc/. Also I've tried /lib/modules/4.4.0-66-generic/kernel/drivers/...
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2answers
1k views

NFS Performance issues on Oracle Linux 6.7: Shared libraries on NFS slow down system

I am currently hunting down some performance issues on some VMWare virtual machines with the same amount of memory and cpus, running Oracle Linux 6.6 (Kernel 2.6) and 6.7 (Kernel 3.8). The machines ...
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0answers
997 views

ZFS on Linux: How do I correctly configure the vdev_id.conf file and trigger vdev aliasing?

I have been trying to get ZFS on Linux to read / process the vdev_id.conf file and give me a /dev/disk/by-vdev directory, to no avail. I have a SAS HBA with redundant connectivity to several hard ...
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0answers
1k views

STP packets dropped (1 packet every 2 seconds) when irrelevant multicast group joined on the interface

I'm trying to understand weird packet drop issue when joining particular multicast group. I think this issue is related to patch introduced in kernel ver 2.6.37 Beginning with kernel 2.6.37, it has ...
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0answers
520 views

nf_conntrack_ftp module has disappearedl

I've been running a Linode droplet for several years with no problems. In the last month, users have reported FTP connection errors, always related to Passive FTP. Investigation shows that the ...
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1answer
38 views

Do I need to compile the kernel again?

Compile the kernel, and an option I forgot to give you my card support. Do I need to compile the kernel again? $ Make && make modules_install $ Make install or is there an easier way to ...
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0answers
2k views

How to get x86_energy_perf_policy // linux-tools-* for Linux kernel 4.7.0-xyz

I am using pstate-frequency to set our server cpu's frequency. This tool needs the x86_energy_perf_policy which is provided by the linux-tools-common package. Using the distributions standard kernel ...
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1answer
859 views

What does the following C-State output mean?

# cat /proc/acpi/processor/CPU0/power active state: C0 max_cstate: C8 maximum allowed latency: 2000000000 usec states: C1: type[C1] promotion[--] demotion[-...
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1answer
266 views

How to find out the response time for C-state to change to higher mode

How much time does the CPU wait to go to higher mode, let's say from C0 to C1? Or if it can be customized, where can I find the current value? Also, does the the C-State changes in stages like first ...
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0answers
1k views

Kernel headers not found in Cent OS 7

I was trying to install ixgbevf drivers. # dkms build -m ixgbevf -v 2.14.2 Error! echo Your kernel headers for kernel 3.13.0-74-generic cannot be found at /lib/modules/3.13.0-74-generic/build or /lib/...
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1answer
2k views

How to compile drivers for Centos 7 with mainline kernel 4.5.0.0-1 from @elrepo-kernel

When using CENTOS 7 with Kernel 4.5, I can not yum install kernel-headers with the same kernel version. I am stuck on 3.10, which is what Centos comes with. How can I install Kernel-headers 4.5 and ...
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0answers
424 views

How to build configfs kernel module externally

I've used the standard make -C /usr/src/$(uname -r) M=$(pwd) modules invocation to build many out of tree modules before (ath, e1000e, etc). Despite being defined as a tristate (tristate "Userspace-...
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1answer
31 views

Which of these modules can I safely disable?

I'm having memory (RAM) issues in my Digital Ocean droplet, I have 3 sites with average of 300 unique visitors daily, with 2GB's of RAM and 2GB (in my opinion this should be enough) of swap... I ...
3
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0answers
210 views

Automatically build kernel modules after unattended upgrades in ubuntu

For automatic upgrades I has installed unattended-upgrades package and configured it. After each unattend kernel upgrade I must run following commands to recompile iscsi kernel modules: apt-get ...
3
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1answer
12k views

Compiling an individual kernel module (Debian/Ubuntu)

I need to modify the ELF loader's kernel implementation of an Ubuntu 14.04 distribution. Having downloaded the sources using: sudo apt-get source linux-image-$(uname -r) I ran the configuration ...
3
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2answers
5k views

iptables drops packets after POSTROUTING

I have a malware analysis environment that will intercept traffic to arbitrary domains and Internet services using InetSim. I have a sandbox that has its DNS server set to the InetSim instance, and ...
3
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1answer
9k views

watchdog service is not working because /dev/watchdog does not exist

There is a ITE8783 watchdog chip placed within my machine (OS Ubuntu 14.04.1). The kernel module it87 supports is. This module was not automatically loaded on startup. So I added it87 to /etc/modules. ...
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1answer
2k views

need to load xt_tcpudp module in Debian 7 Wheezy with OpenVZ kernel. Error: 'could not open'

I followed this guide IPTABLES inside container guide @ openvz.org I'm running Debian 7 Wheezy x64 which was dist-updgrade'd before installing OpenVZ. The container is Debian7 x64 minimal. It's ...
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1answer
3k views

How to reliable re-install nf_conntrack module after removal?

I want to remove the nf_conntrack module from debian. However I don't want to do this until I know how to get it back (if I have to), and currently am not confident about this. The steps another ...
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0answers
790 views

ddrescue a failing hard drive; getting a kernel module deadlock

I'm in the process of recovering a dying hard-drive with ddrescue. The utility works very well in the parts of the drive that have not problems but in the parts of the drive with problems it goes very ...
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2answers
3k views

All terminal windows suddenly disappear in Linux [closed]

Sorry in advance for the wall of text. I'm having a problem which is leaving me with very few clues as to what might be going on. Also, I apologize if ServerFault isn't the ideal place for this ...
6
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2answers
7k views

Make kernel modules available that have been deactivated on Fedora

Edit: I turned Cristians answer into a script which does everything automatically: https://github.com/frans-fuerst/magic/blob/master/fedora-activate-can.sh I need some kernel modules which are ...