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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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Committed/Allocated memory in Linux is less than used memory. How is that possible?

So I have a system with linux kernel 4.14.73 in which I am using values from /proc/meminfo in an program that shows the system specs including memory used and memory reserved. All was well until I saw something really weird: the total committed…
igalvez
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Ubuntu under Hyper-V: Which kernel to keep and how to get rid of the rest?

Recently I needed to quickly set up fresh new VM with Ubuntu 18.04 TLS under Hyper-V (this is not my ordinarily toolbox but I can not use anything that Hyper-V this time). Ok, I did the install (I used to choose 'hwe' install during the initial…
Kevin M
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ClamAV for the host running docker containers - inotify/fanotify limits

I'm implementing anti-virus solution for Linux with ClamAV daemon running in On-Access mode, watching the created/opened files for malicious content at the host system AND in docker containers, running at the host. What limitations I've found so…
mva
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cgroup rt support in Debian Buster (Kernel 4.19.0)

Is it possible to enable the cgroup rt support in Debian Buster (kernel 4.19.0) without recompiling the kernel? Perhaps with a grub configuration parameter? Thanks. Background: Docker logs this warnings: Your kernel does not support cgroup rt…
erunima
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Finding a system vulnerable to dirtycow

I'm not sure where to turn, so I turned to this forum. Please don't downvote me for nothing, I'm just trying to ask a question. Hello! So, I've been trying to find a system vulnerable to dirtycow and I can't find any. (atleast any that can compile C…
1byte
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How to selectively disable IP reassembly?

The diagram below depicts a scenario that involves aggregation of three slow channel throughputs over a WAN. A fast host on a WAN (@ 54.239.98.8) is communicating with a host on a LAN (@ 192.168.0.100) which is connected via three slow channels to…
George Robinson
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fatal error openssl/opensslv.h : No such file or directory

I'm trying to compile latest stable kernel version 5.2.13 on centos 7(kernel 3.10.0). In make bzImage step, I got following error. How can I sort it out?
Mg Nyi Naing
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How do I remove a kernel package from an image chroot if it's the kernel running on my build host?

I am trying to build a custom image using diskimage-builder, and amongst other things, that tool updates all the packages within the image to the latest version, including the kernel. It also uses package-cleanup to remove any old kernels. However,…
Drulgaard
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Determine Kernel Version based on File

I have a bunch of different Linux Operating Systems for many different architectures and for each of them I would like to determine their Linux kernel version. I can only access the filesystem but I cannot boot the system as it is for a different…
Lexicon
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Possible Linux page table issue/huge load average with large heap JVM that results in significant sys time in GC logs

Our service runs on AWS on m5.12xlarge nodes (48 cores, 192 G RAM) on Ubuntu 16.04. We use Java 8. For our service we allocate about 150G as max heap size. We have no swap on the node. The nature of our service is that it allocates a lot of large…
devurandom
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Iptables save -c sometimes emits zero counters. Wanted to understand in which scenarios does this happen?

I have an application to which runs iptables-save periodically. Occasionally i see the counters being emitted as zero values. Iptable save result at 3 continuous intervals : Min 1 : [940:73616] -A REQUEST_COUNT -m limit --limit 1000/sec…
Sunriser
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Why UFW logs ICMP and TCP/UDP in the same line?

I'm trying to understand how log format is organised. My question is why ICMP block goes with some enclosure about another TCP/UDP packet. How am I supposed to read this [include] and how this packet relate to an ICMP packet? kernel:…
danilabagroff
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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 the lack of this one cannot use 'ct count' in…
cranked
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create one thousand macvlan , ping local ip failed

I want to create 1000 macvlan with diffrent ip. And use ip rule routing different public ip to internet with multiple interfaces. First create 1000 macvlan: ip link add link eth0 address %02x:%02x:%02x:%02x:%02x:%02x eth0_%d type macvlan %02x is mac…
jianxi sun
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broken WoL with vanilla kernel on Debian

I'm on Debian Buster/Sid, but I like to compile new vanilla kernels myself, just to try them out. However I face a recurring problem: if I use a Debian packaged kernel, Wake On Lan works correctly and I can wake my pc by sending the magic packet to…
Lucio Crusca
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