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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.

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.

The Linux kernel is released under the GNU General Public License version 2 (GPLv2) (plus some firmware images with various non-free licenses[citation needed]), and is developed by contributors worldwide. Day-to-day development discussions take place on the Linux kernel mailing list.

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Forwarding ipv6 link local destined traffic not working

Setup: VM (eth0) -> hostveth -> ContainerVeth eth0 and hostveth are in VM network namespace while containerveth is in different namespace sysctl ipv6 forwarding and iptables FORWARD chain are allowed. Checked filter table and no rule to block link…
user3550166
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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 present on the BTRFS disks, so copying it all…
catleeball
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Advice required for sending STP BPDU traffic between tap interfaces connected by common bridge

Need advice for the bridge tap interface to run stp traffic. created the tap interface and bridge   Have come across stp BPDU is consumed by bridge. i'm running the scapy on the host, however i'm not seeing the stp BPDU on the bridge nor on the…
Santosh Kumar
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IPv6 multipath routing with configurable weight

With Linux kernel 4.14, when I add IPv6 multipath routes with weights (10 & 30), they are getting added with same weight '1'. IPv4 route does not have this issue. I checked with exact same steps in a different machine with Linux kernel 4.19, where…
m.divya.mohan
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Disk extremely slow on VM

Environment: Hypervisor: VMware ESXi, 6.5.0, 4564106 Guest OS: Debian 9.5 | Kernel: 4.19.0-0.bpo.16-amd64 Guest resources: RAM: 40GB, CPU: 16 cores Intel(R) Xeon(R) CPU E5-2650 v4 @ 2.20GHz, Disk: VMware virtual disk on a LUN of HP SAN storage 2040…
user2798081
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Is it possible to upgrade from centos 6 kernel 2.6.32-754.25.1.el6.x86_64 to 5.12.1 version?

You are currently using centos6 kernel 2.6.32-754.25.1.el6.x86_64. I'd like to upgrade to 5.12.1 to take action against the vulnerability in this version, and I'm asking if it's possible. If it is impossible, I would like to know if there is a way…
uni__
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What is the state of AppArmor network rules in the latest kernel?

I decided to give AppArmor a try and while it works great at restricting file access, signals handling etc., it completely ignores any network rules. It doesn't complain about anything, but it also doesn't restrict network access. According to Arch…
Vojtech Kane
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What triggers a "*** Guest State ***" register dump from the linux kernel?

Prefix: There is no kernel crash. Something, rarely, is triggering Guest State, Host State, Control State register and other debug variable dump to kernel log. The system in question is running many many virtual machines via qemu/kvm. The kernel…
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Linux mountpoint can not be unmounted no matter what?

I have a mount point in Linux that does not show any open files in lsof or fuser. The mount point was exported in NFS, but is no longer exported, and there are no more files or directories in the mount point. We have checked to make sure no one is…
user1955162
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Linux header 4.9.0-11-amd64 is missing in debian

I am a software developer and have only a basic understanding about Linux systems. We are in a migration phase from GCP to AWS and found that the Linux headers are missing while installing Cloud endure agent. On checking found that the version…
Tismon Varghese
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Does Cached includes Mapped pages in /proc/meminfo?

The Linux kernel definition for Cached memory does not mention it includes Shmem and Mapped pages (https://www.kernel.org/doc/Documentation/filesystems/proc.txt), but I've found some references where it is stated they are included (e.g.…
giglio91
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What is the difference between "Kernel messages" and "Messages from the init system and the system logger"

In this blog, it gives a Recommended serial kernel parameters, PCs with video card. console=tty0 console=ttyS0,9600n8 It says Kernel messages will appear on both the first virtual terminal and the serial port. Messages from the init system and the…
Phantom
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confused about buff/cache and available memory metrics

I'm totally confused about the memory metrics provided by free command in linux. currently I receive the following metrics: total used free shared buff/cache available Mem: 1.9Gi 624Mi 759Mi …
Soheil
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pacemaker.log file is flooding with “Too many open files (24)”

My system is currently at Centos 8 and my /var/log/pacemaker/pacemaker.log file is flooding with GB of data and most of the error messages shows the below message. These messages are more than 1000 in numbers and they are filling up like almost…
Zorrom
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Ubuntu Server 20.04 freeze/unresponsive, kernel BUG: Bad page state in process

Server Information: Distributor ID: Ubuntu Description: Ubuntu 20.04.1 LTS Release: 20.04 Codename: focal today I noticed my new Server crashed/froze. It did not accept any ssh connections anymore and when I tried to plug in a…
gary
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