Common pewdiepie W
https://redd.it/1jze66x
@r_linux

Debian Bug #1094969: "git-remote-http is linked against incompatibly licensed OpenSSL"
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1094969

https://redd.it/1jze0u7
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GNOME Foundation Update, April 2025
https://blogs.gnome.org/aday/2025/04/14/gnome-foundation-update-april-2025/

https://redd.it/1jzd3xg
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Linux PCACHE Proposed For Persistent Memory Cache For Block Devices
https://www.phoronix.com/news/Linux-PCACHE-RFC

https://redd.it/1jzj28j
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I can't close my terminal and I don't know why
https://redd.it/1jzlt8q
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NEON-optimized sin/cos math library for embedded Linux — high accuracy, small, and fast
https://github.com/farukalpay/FABE

https://redd.it/1jzmslw
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I have decided to use Linux on my old laptop... But which distro?

Long story short this laptop is 10 year old and has 4GB of ram until Celeron processor and 500 GB of HDD it's going to be used for to studying again other stuff... which destroy should I use on that is the white I'm not using it daily it's my little sister's laptop and I want to use a graphical UI not any terminal stuff...

https://redd.it/1jzpehr
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The Rise of Slopsquatting: How AI Hallucinations Are Fueling a New Class of Supply Chain Attacks
https://socket.dev/blog/slopsquatting-how-ai-hallucinations-are-fueling-a-new-class-of-supply-chain-attacks

https://redd.it/1jzpz5l
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Fedora 42 released
https://fedoramagazine.org/whats-new-fedora-workstation-42/

https://redd.it/1jzssb5
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Lenovo now ship with Fedora
https://redd.it/1jztroz
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Linux for a EU smart phone and software eco system?

If the EU is to become independent of the US & China in tech, we need a European smartphone, tablets & laptops, with something else than Android with an Arm CPU. Ideally, a RISC-V CPU designed in/by a European company running some independent form of Linux. But Nokia or Ericsson does not seem to be ready to take up the role they once had.
Is it at all possible and could others do it?

https://redd.it/1jzrv4w
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Help! Gnu Grub version 2.12
https://redd.it/1jzzzbc
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Breakthroughs in Open Source graphics: End-to-end HDR with upstream technologies, PanVK on a brand-new SoC, and NVK + WebGPU, out of the box
https://www.collabora.com/news-and-blog/news-and-events/breakthroughs-open-source-graphics-embedded-world-2025.html

https://redd.it/1k02koz
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Well it happened (btw)
https://redd.it/1k073p8
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MITRE Warns CVE Program Faces Disruption (Security Week) [LWN.net]
https://lwn.net/Articles/1017565/

https://redd.it/1k0c7jf
@r_linux

How useful is Timeshift when moving between distros?

Am I able to use Timeshift if I'm downloading a different distro or can backups only be used in the same distro they were made In (example: Mint>Mint)? Also, what would be difference between the setup options when it asks what files to keep/skip (Keep all>...>exclude all) for Home and Root? Under what circumstances would each option make more or less sense?

https://redd.it/1k0bv8f
@r_linux

Is Linux under the control of the USA gov?

AFAIK, Linux (but also GNU/FSF) is financially supported by the Linux Foundation, an 501(c)(6) non-profit based in the USA and likely obliged by USA laws, present and future.

Can the USA gov impose restrictions, either directly or indirectly, on Linux "exports" or even deny its diffusion completely?

I am not asking for opinions or trying to shake a beehive. I am looking for factual and fact-checkable information.

https://redd.it/1k0ezdi
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Legends never die
https://redd.it/1k0fstz
@r_linux

UNC5174 Deploys SNOWLIGHT Malware in Linux and macOS Attacks
https://sensorstechforum.com/unc5174-snowlight-malware-linux-macos/

https://redd.it/1k0h03p
@r_linux

🔍 From PostgreSQL Replica Lag to Kernel Bug: A Sherlock-Holmes-ing Journey Through Kubernetes, Page Cache, and Cgroups v2

[\(I&GPT\)](https://preview.redd.it/tmkiqilis6ve1.png?width=1280&format=png&auto=webp&s=256b665f3afe4158d541f4b2a240f425e061b347)

What started as a puzzling PostgreSQL replication lag in one of our Kubernetes cluster ended up uncovering... a Linux kernel bug. 🕵️

It began with our Postgres (PG) cluster, running in Kubernetes (K8s) pods/containers with memory limits and managed by the **Patroni** operator, behaving oddly:

* Replicas were lagging or getting dropped.
* Reinitialization of replicas (via pg\_basebackup) was taking **8–12 hours** (!).
* Grafana showed that **Network Bandwidth (BW) and Disk I/O** dropped dramatically — from 100MB/s to <1MB/s — **right after the pod’s memory limit was hit**.

Interestingly, memory usage was mostly in **inactive file page cache**, while **RSS** (Resident Set Size - container's processes allocated MEM) **and WSS** (Working Set Size: RSS + Active Files Page Cache) stayed low. Yet replication lag kept growing.

**So where is the issue..? Postgres? Kubernetes? Infra (Disks, Network, etc)!?**



We ruled out PostgreSQL specifics:

pg\_basebackup was just streaming files from leader → replica (K8s pod → K8s pod), like a fancy rsync.

* This slowdown only happened **if PG data directory size was greater than container memory limit**.
* Removing the memory limit fixed the issue — but that’s not a real-world solution for production.

***So still? What’s going on? Disk issue? Network throttling?***



We got methodic:

* **pg\_dump** from a remote IP > /dev/null → 🟢 Fast (no disk writes, no cache). ***So, no Netw issues?***
* pg\_dump (remote IP) > file → 🔴 Slow when Pod hits MEM Limit. ***Is it Disk???***
* Create and copy GBs of files inside the pod? 🟢 Fast. ***Hm, so no Disk I/O issues?***
* Use **rsync** inside the same container image to copy tons of files from remote IP? 🔴 Slow. ***Hm... So not exactly PG programs issue, but may be PG Docker Image? Olso, it happens when both Disk & Network are involved... strange!***
* Use a completely different image (**wbitt/network-multitool**)? 🔴 Still slow. ***O! No PG Issue!***
* Mount host network (hostNetwork: true) to bypass CNI/Calico? 🔴 Still slow. ***So, no K8s Netw Issue?***
* Launch containers manually with **ctr (*****containerd*****)** and memory limits, no K8s? 🔴 Slow! ***OMG! Is it Container Runtime Issue? What can I do? But, stop - I learned that containers are Linux Kernel cgroups, no? So let's try!***
* Run the same rsync inside a raw **cgroup v2 with memory.max set** via **systemd-run**? 🔴 Slow again! **WHAT!?? (*****Getting crazy here*****)**



But then, trying deep inspect, analyzing & repro it …

👉 On my **dev machine** (Ubuntu 22.04, kernel 6.x): 🟢 All tests ran smooth, no slowdowns.

👉 On Server there was Oracle Linux 9.2 (kernel 5.14.0-284.11.1.el9\_2, RHCK): 🔴 Reproducible every time! So..? Is it Linux Kernel Issue? (***Do U remember that containers are Kernel namespaced and cgrouped processes? ;)***)

So I did what any desperate sysadmin-spy-detective would do: started swapping kernels.

But before of these, I've studied a bit on Oracle Linux vs Kernels Docs ([https://docs.oracle.com/en/operating-systems/oracle-linux/9/boot/oracle\_linux9\_kernel\_version\_matrix.html](https://docs.oracle.com/en/operating-systems/oracle-linux/9/boot/oracle_linux9_kernel_version_matrix.html)), so, let's move on!

🔄 I Switched from RHCK (Red Hat Compatible Kernel) → **UEK (Oracle’s own kernel)** via grubby → 💥 **Issue gone**.

Still needed RHCK for some applications (e.g. **\[Censored\] DB** doesn’t support UEK), so we tried:

* RHCK from **OL 9.4** (5.14.0-427) → ✅ FIXED
* RHCK from **OL 9.5** (5.14.0-503.11.1) → ✅ FIXED (though some HW compat testing still ongoing)



📝 I haven’t found an official bug report in Oracle’s release notes for this kernel version. But behavior is clear:

⛔ OL 9.2 RHCK (5.14.0-284.11.1) = broken :(

✅ OL 9.4/9.5 + RHCK = working!

I may just suppose that the memory of my specific

cgroupv2 wasn't reclaimed properly from inactive page cache and this led to the entire cgroup MEM saturation, inclusive those allocatable for network sockets of cgroup's processes (in cgroup there are "sock" KPI in memory.stat file) or Disk I/O mem structs..?

But, finally: ***Yeah, we did it :)!***



# 🧠 Key Takeaways:

* **Know your stack deeply** — I didn’t even check or care the OL version and kernel at first.
* **Reproduce outside your stack** — from PostgreSQL → rsync → cgroup tests.
* **Teamwork wins** — many clues came from teammates (and a certain ChatGPT 😉).
* **Container memory limits + cgroups v2 + page cache** on buggy kernels (*and not only - I have some horror stories on CPU Limits ;)*) can be a perfect storm.



I hope this post helps someone else chasing ghosts in containers and wondering why disk/network stalls under memory limits.

Let me know if you’ve seen anything similar — or if you enjoy a good kernel mystery! 🐧🔎

https://redd.it/1k0ipkg
@r_linux