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Questions tagged [linux-kernel]

The Linux kernel is the operating system kernel used by the Linux family of Unix-like operating systems. It is one of the most prominent examples of free and open source software.

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OCFS2 on Google Cloud Platform GCP/GCE - FATAL: Module ocfs2_dlmfs not found linux-modules-extra

I installed OCFS2 on my google cloud server, when I try bringing o2cb online, I get this error: Loading filesystem "ocfs2_dlmfs": Unable to load filesystem "ocfs2_dlmfs" Failed The ...
Tacoma50's user avatar
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Cannot boot live USB after changing boot order via UEFI shell

I have an Acer travel mate running Arch Linux via EFISTUB. after last sy update I rebooted and got "No bootable device found" screen. To fix that I prepared a live arch USB and changed boot ...
Syed Ali's user avatar
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Issue: oracle linux UI goes black

I'm using the oracle linux verison Linux localhost.localdomain 5.15.0-207.156.6.el9uek.x86_64 #2 SMP Thu Jun 6 02:32:40 PDT 2024 x86_64 x86_64 x86_64 GNU/Linux I'm facing the issue, whenever I try to ...
Atul Joshi's user avatar
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158 views

ip6gre tunnel ignores source device?

I'm trying to set up an ip6gre tunnel on Ubuntu with kernel 6.5.0-35-generic #35~22.04.1-Ubuntu and iproute2 5.15.0-1ubuntu2. I ran into bugs with netplan and systemd-networkd (sigh) so I figured I'd ...
Marlies's user avatar
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What do these bntx console errors mean?

I have a server spilling out the following errors to the console bnxt_en 0000:c8:00.1 bnxt_rel: Failed to add GID: Oxfffffff2 infiniband bnxt_rel: add roce_gid GID add failed port=1 index=2 ...
Andreas Fink's user avatar
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How to force Linux kernel to refresh disk modifications

I have a disk that was used by ceph, I used wipefs to clean it. To make the system see that the disk is empty and can be used I have to reboot. Is there a way to force the kernel to recognize those ...
Wodel's user avatar
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Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 error on 5.15.0-1032-realtime

I am trying to isolate cores on an ARM64 Ampere (Supermicro) for real time workloads. When running workloads with RT prios I see the below error. I am not sure whats going wrong in this moment. I am ...
ninjab3s's user avatar
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Why a network interface still responding even when it is down?

It may sound a bit silly. I'm experimenting with my dn42 network setup, in which I assigned an IP address to a dummy interface of Machine A and connect to another node (Machine B) using a WireGuard ...
d34db33f's user avatar
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Enabling gso udp in nginx results in bad length udp packets from tcpdump

I have compiled the latest version of Nginx with H3/QUIC support and everything is working fine. However, after enabling quic_gso on, tcpdump is now flooded with "bad length" datagrams: 14:...
forke's user avatar
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OOM killing programs when used memory is at 30%

I am getting a bit crazy about this one: I am getting quite often processes killed by the kernel because of OOM. I see that free reports 14 GB used out of 14 GB, but when I add up the RSS of all the ...
chronos's user avatar
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Is it possible to run Docker on a hypervisor type 1?

Is it possible to run Docker bare metal on a type 1 hypervisor such as VMware and Hyper-V? Docker uses that same kernel as the host. So if the hypervisor is based on linux, does that work? Is there ...
luckyluke's user avatar
2 votes
1 answer
233 views

I/O errors during BLKDISCARD on Linux Dell R720 with SAS Seagate Nytro

I have a Dell R720 with PERC H310 Mini (LSI 2008 MegaRAID) controller which I have just loaded with 4 new Seagate Nytro XS1600LE70045 1.6TB SSD, configured as individual disks for Linux software raid. ...
M Conrad's user avatar
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Is it safe to mount same btrfs subvolume multiple times at same time?

I know that it is safe to mount multiple volumes from the same btrfs volume at the same time. But what about the same subvolume? The subvolume would be mounted from the same Linux kernel instance. ...
Jacob Brown's user avatar
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TCP_NODELAY for All current sockets in linux

i want lowest latency network with tcp_nodelay., in windows OS we can easily enable TCP_NODELAY through registry of windows. i searched on the red hat website and another website but up to now, my ...
Kamala Nivas's user avatar
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Remove old kernels with security implications / vulnerabilities

Some scanning tools (Qualsys, Sentinel, etc) detect installed old kernels and will report them as problems if those kernel versions have vulnerabilities. Is there a way to remove them if they have ...
Geoffrey Wiseman's user avatar
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634 views

MariaDB io_uring_queue_init() failed with errno 1 with kernel version 6.2.0-1018

I am running MariaDB using the official docker hub image: mariadb:lts (this is MariaDB 10.11.6-MariaDB-1:10.11.6+maria~ubu2204 source revision fecd78b83785d5ae96f2c6ff340375be803cd299) When the ...
g.pickardou's user avatar
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Why do we need "never" for transparent huge pages?

Transparent huge pages (THP) can be always, madvise and never. I see that most database tutorials suggest using never for valid reasons. However, why do we need the never option at all if programs can ...
Cemre's user avatar
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meminfo doesn't include memory allocated by page_allocator

I found that the meminfo doesn't show the memory usage which is directly allocated by the page allocator (fn:allocate_pages) file:///proc/meminfo MemTotal: 2039496 kB MemFree: 108684 ...
Helen Tan's user avatar
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257 views

Adjust Logging Level for the OOM Killer

Is there a way to configure Linux so that the OOM killer will report/post only which process is killed, but not dump the entire machine state with it? The reason I ask that is, that on our production ...
Krishna Chaitanya's user avatar
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Unable to ping the vm running with ebpf program

I am using an eBPF program which counts the number of packets received on its interface on my destination vm. At first I can able to ping the vm running with eBPF program that is destination from the ...
Manideep G's user avatar
1 vote
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85 views

Why are compact_stall increasing on a system with Transparent Hugetable defrag set to 'defer'?

We're running a reverse proxying application within docker that is very network intensive. Dockerd is occasionally allocating memory using madv_hugepage, and we've observed this sometimes causes ...
d1jt's user avatar
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Linux Kernel Module loading in Docker container - Runaway Usage

When starting a docker container on an Amazon Linux 2 instance, I load a kernel module. I first unload the module, and load it again so that if the kernel module is updated, the newest version will be ...
Ozgur Akcali's user avatar
1 vote
1 answer
510 views

Debian - Wireguard Forces Real Time Kernel

I've a system running Debian 12 and while trying to install Wireguard I noticed it would pull a different kernel: root@iotgateway:~# apt install wireguard --no-install-recommends Reading package lists....
TCB13's user avatar
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How to change the batch size of pcp in linux kernel?

I increased the pcp->high via echo 8 > /proc/sys/vm/percpu_pagelist_fraction command, but the pcp->batch value still remains at 63. vm stats threshold: 125 cpu: 383 count: 103931 ...
Frontier_Setter's user avatar
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RHEL9.2 complains about missing /lib/modules/5.14.0-284.25.1.el9_2.x86_64 when rebuilding initramfs

The kernel on one of our RHEL9.2 servers was recently upgraded to 6.2.8 in preparation for a software upgrade but due to complications, we've had to revert back to 5.14.0-284.25.1.el9_2.x86_64. I've ...
nathan.glades's user avatar
2 votes
0 answers
655 views

Raising priority of network interface interrupts on Ubuntu 22 low latency kernel 5.15

I am running Ubuntu 18 on several servers with the low latency kernel. Previously I have used chrt to raise the priority of interrupt threads for the interrupts related to a specific network interface....
Jonas's user avatar
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1 answer
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I want to make Linux Kernel Source an RPM file

I am currently using Rocky Linux 8.7. The current kernel version is "4.18.0-425.13.1.el8_7.x86_64". I want to upgrade kernel through RPM, not source compile. In the kernel compile step, use ...
gotothesky's user avatar
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Re-compressing XZ kernel module?

I have a kernel module produced by kernel option CONFIG_MODULE_COMPRESS_XZ. When I manually decompress the file with unxz and re-compress with xz, the new .ko.xz file differs from the original .ko.xz ...
Pavel Hofman's user avatar
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1 answer
482 views

Ethernet connection is dropped when restarting openibd ( Infiniband ) service

I have a multiple servers with Ethernet controller on board and InfiniBand controller installed in a PCI slot. The problem is when im restarting openibd.service which should control only the ...
Oren's user avatar
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1 answer
104 views

How to make IpTable Rules immutable in linux

I work on Linux and want to add rules to iptable. I want these rules to be immutable anyway (either changed or deleted). What should I do? Note that for me the rules that are running and kept in ...
amirsalimi's user avatar
1 vote
1 answer
164 views

rp_filter kernel setting precedence

When rp_filter kernel setting is configured with different boolean, which takes precedence? all.rp_filter or interface.rp_filter? net.ipv4.conf.all.rp_filter = 1 net.ipv4.conf.default.rp_filter = 1 ...
Rama's user avatar
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Many linux process falling into 'D' status, server got stuck

I am running a high performance application on Centos 7.4 op system 3.10 with RT kernel. Sometimes a few process falling into 'D' status(uninterruptible), such as systemd、runc init、umount. The stack ...
alanZhang's user avatar
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1k views

How to get rid of “Duplicate IMA measurements will not be recorded in the IMA log.”?

In the journal of my Debian 12 kernel linux-image-6.1.0-10-amd64 version 6.1.37-1 I discovered the following lines: … … hostname systemd[1]: Starting systemd-journald.service - Journal Service … … ...
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6 votes
2 answers
26k views

failed to create fsnotify watcher: too many open files

I received this error while trying to tail the log of a Kubernetes pod. failed to create fsnotify watcher: too many open files
Steven's user avatar
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2 answers
515 views

How does GRE interface route packet to remote endpoint

I have the following topology which I configured to run a GRE tunnel between my Desktop and the wireless router. On the PC: ip link add l2gre0 type gretap remote 192.168.0.103 local 192.168.0.10 On ...
Haswell's user avatar
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1 vote
1 answer
5k views

debian update fails on buildine "new" kernel

my current version $ cat /etc/*elease* PRETTY_NAME="Debian GNU/Linux 12 (bookworm)" NAME="Debian GNU/Linux" VERSION_ID="12" VERSION="12 (bookworm)" ...
francois P's user avatar
-2 votes
1 answer
375 views

Updating Centos 8.0 to Centos 8.3

I need your expert help on how can I update Centos 8.0 to Centos 8.3. I have installed Centos 8.0 using the standard option without GUI. It's a requirement at work. Please help Thanks & regards,
vinv27009's user avatar
1 vote
1 answer
890 views

Cannot downgrade linux-image-amd64

Some time ago, I wanted to try the 5.10.127-2~bpo10+1 kernel on Debian 10 Buster system. However, that kernel was not maintained nor patched by Debian any longer. Now, new 4.19.x kernels no longer ...
mt42's user avatar
  • 131
3 votes
1 answer
1k views

Enabling wireguard log messages with secure boot / kernel lockdown enabled

On fedora 37, I am trying to enable kernel log messages for wireguard by executing this command in a root-shell: echo module wireguard +p > /sys/kernel/debug/dynamic_debug/control Unfortunately, ...
Zulakis's user avatar
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1 vote
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180 views

Kernel reboot without log during starting the crash kernel

I am testing crash kernel image feature with arm64 device, kernel version is linux-5.4, now i am trigger kernel crash via "echo c > /proc/sysrq-trigger", then kernel would trigger null-...
Andy2's user avatar
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How do I fix amdgpu and amdgpu-dkms packages not installing?

I'm trying to install the amdgpu package and it throws a bunch of errors: Reading package lists... Done Building dependency tree... Done Reading state information... Done The following packages were ...
Mach's user avatar
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1 answer
418 views

How to find the cause of a server kernel panic?

Our high-load server is in kernel panic. How can we identify the cause and correct it? It is a Dell PowerEdge R940 with 256GB ram and 20TB disk array with the root in a SSD disk. Linux CentOs 7 system....
user2309000's user avatar
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1 answer
504 views

Why do some servers have /etc/sysconfig/kernel and others do not?

I spent some time looking into this and couldn't figure out why there are servers with and without /etc/sysconfig/kernel. What's particularly interesting is that we have some servers with the same ...
hfranco's user avatar
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1 vote
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176 views

Routing issue on Debian 11 VM

I updated my OPnsense "router/gateway" to 23.1 a few days ago, and now I am experiencing an issue with one of my machines. I have one machine with OPnsense installed that acts as a basic NAT ...
Granwille's user avatar
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2 answers
333 views

Can a Linux web server which hasn't been restarted for years be secure?

The content of /proc/uptime reports: 48973211.37 1627573879.70 48973211 seconds mean the server is up for 567 days without a restart. Since then many serious security fixes have been applied to the ...
zomega's user avatar
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2 answers
1k views

How to debug Linux server reboots?

I have a Debian 10 server that keeps rebooting. journalctl offers possibility to list last boots: journalctl --list-boots -6 1ee519dc5bc24e88af75cc609ee32093 Mon 2023-02-06 21:02:02 UTC—Sun 2023-02-12 ...
Tombart's user avatar
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190 views

ICMP Echo requests initiated from an interface inside VRF don't get ICMP echo replies

I have this setup, which is basically a linux server with one physical interface connected to another device. On this physical interface there is 2 VLANs, 100 and 200. In VLAN100 there is an IP ...
Mohamed Kamal's user avatar
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1 answer
204 views

Injected packets using libPCAP library is not seen from python socket sniffer and netcat

I am using libpcap to transmit packets between two VETH pairs {veth1, veth1peer} and {veth2, veth2peer} and using each others peer to inject packets upwards to veth1 or veth2 and disabled "rp-...
Mazin Roushdy's user avatar
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0 answers
283 views

No irq handler for vector - randomly starting after time

I don't know where to start, so I give some basic information about my system and my observation. I'm having a Fedora 37 Linux server at home. After some uptime (happens after 3-5 days after booting), ...
Michael Hirschler's user avatar
1 vote
0 answers
304 views

Set number of threads when auto compiling kernel

I use Ubuntu as main operating system. I have found that when a new kernel is included in a system upgrade, during the upgrade, certain kernel-related items are compiled (kernel modules?). During this ...
Ommadawn's user avatar
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