kernellogger

kernellogger, 8 hours ago to linux

#Linux 6.10-rc1 is out: https://lore.kernel.org/lkml/CAHk-=wjQv_CSPzhjOMoOjGO3FmuHe5hzm6Ds69zZSFPa4PeuCA@mail.gmail.com/

"'[…] This seems to be a regular-sized release, maybe even slightly on the smaller side. All the stats look fairly normal […]

We don't have any new filesystems, and the xfs online repair work means that the bcachefs fixes aren't even the biggest filesystem change any more. But all of that is dwarfed by all the usual driver updates […]

Please - let the testing commence,

Linus '"

kernellogger, 2 days ago (edited 2 days ago) to linux

The mseal() syscall was merged for #Linux 6.10: https://git.kernel.org/torvalds/c/0b32d436c015d5a88b3368405e3d8fe82f195a54

It's a way to prevent changes to portions of the virtual address space – and quite similar to #OpenBSD's mimmutable() syscall.

For details see the docs (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/Documentation/userspace-api/mseal.rst) or two @LWN articles (https://lwn.net/Articles/948129/ and https://lwn.net/Articles/958438/)

#LinuxKernel #kernel

kernellogger, 3 days ago to linux

FWIW, in case you heard about "#Linux #kernel developers removed a deprecated #btrfs mount option #systemd relied on":

• Once the issue was properly reported to the #LinuxKernel developers earlier this week a patch to make things work again was proposed and accepted within a day or two: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=440861b1a03c72; that patch will likely be mainlined in the next 72 hours and then backported to affected series.

• the removal did not break the world, for a lot (most?) people things just worked fine

kernellogger, 3 days ago to linux

"'[…] #git was created as a tool to unblock future #Linux #kernel releases — not intended as a global reinvention of all source code management; Linus’s comments highlight that he explicitly saw source code management as the domain of other tools that would then interface with git. […]'"

https://graphite.dev/blog/bitkeeper-linux-story-of-git-creation

#LinuxKernel #svm #vcs

kernellogger, 5 days ago (edited 5 days ago) to linux

Not sure what this human tried to achieve with the private reply[1] shown in the screenshot, but somehow it made me smile and brightened up my day. 😄

[1] a reply to a #Linux #kernel regression tracking mail I sent yesterday: https://lore.kernel.org/all/83df4e94-e1ec-42f6-8a15-6439ef4a25b7@leemhuis.info/

kernellogger, 10 days ago to linux

Jeremy Allison writes:

'" The data shows that “frozen” vendor #Linux kernels, created by branching off a release point and then using a team of engineers to select specific patches to back-port to that branch, are buggier than the upstream “stable” Linux #kernel created by Greg Kroah-Hartman. '"

https://ciq.com/blog/why-a-frozen-linux-kernel-isnt-the-safest-choice-for-security/ #LinuxKernel

kernellogger, 12 days ago to linux

Theo de Raadt and Linus Torvalds are debating mseal(), a #Linux variant of OpenBSD's mimmutable() syscall – which might or might not be merged for #kernel 6.10, as can be seen from other parts of the discussion:

https://lore.kernel.org/all/CAHk-=wgsGCKvN0Db6ZRZqJwXQrmhZyWB6RmABaOp4DiZbXgNew@mail.gmail.com/T/#u

kernellogger, 12 days ago to linux

Linus added a farewell notice to the merge commit that removed alpha EV5 support from #Linux mainline (and thus for version 6.10): https://git.kernel.org/torvalds/c/736676f5c3abd1fc01c41813a95246e892937f6d #kernel #LinuxKernel

kernellogger, 12 days ago to linux

The TPM bus encryption and integrity protection changes prepared by @jejb and @jarkko were merged for #Linux 6.10: https://git.kernel.org/torvalds/c/b19239143e393d4b52b3b9a17c7ac07138f2cfd4

"[…] The key pair on TPM side is generated from so called null random seed per power on of the machine [1]. This supports the TPM encryption of the hard drive by adding layer of protection against bus interposer attacks. […]"

[1 https://lore.kernel.org/linux-integrity/20240429202811.13643-1-James.Bottomley@HansenPartnership.com/

kernellogger, 14 days ago to linux

A question for experts on #git bisecting the #Linux #Kernel:

Assume someone runs into a regression when updating from 6.1.90[1] to 6.6.30 that needs bisecting. What do you suggest:

• Check manually which mainline release (e.g. 6.2, 6.3, ...) introduced the problem and afterwards bisect between that and the previous release.

• Bisect straight between 6.1 and 6.6.30.

1/ I guess I would definitely go for…

[1] let's assume that 6.1 was fine for this scenario to keep things simpler

kernellogger, 14 days ago to linux

#Linux 6.9 is out.

LWN.net's list of new features:

• Highlights: https://lwn.net/Articles/972886/

• Merge-window summaries: https://lwn.net/Articles/965141/ and https://lwn.net/Articles/965541/

Linus' release announcement: https://lore.kernel.org/lkml/CAHk-=whnKYL-WARzrZhVTZ8RP3WZc24C9_DT7JMJooONNT2udQ@mail.gmail.com/

[The kernelnewbies text is not yet ready]

#Kernel #LinuxKernel

kernellogger, 15 days ago to linux

#Linux might soon start supporting the #RaspberryPi 5 thx to patches from Andrea della Porta:

https://lore.kernel.org/lkml/cover.1715332922.git.andrea.porta@suse.com/ – Add minimal boot support for Raspberry Pi 5

If you just thought "But Linux already supports the #RaspberryPi5, see #RaspberryPiOS", then you just learned why differentiating between the #kernel called Linux (meant here) and operating systems called Linux (often build from forks of the former carrying modifications and enhancements) is important. #LinuxKernel

kernellogger, 21 days ago to linux

Looks like #Linux 6.10 will drop support for a few old #alpha machines:

https://lore.kernel.org/all/20240503081125.67990-1-arnd@kernel.org/

"'[…]
alpha: remove DECpc AXP150 (Jensen) support
alpha: sable: remove early machine support
alpha: remove LCA and APECS based machines
alpha: cabriolet: remove EV5 CPU support
alpha: drop pre-EV56 support
[…]
72 files changed, 166 insertions(+), 4545 deletions(-)'"

These changes from @arnd since today can be found in linux-next, too.

#kernel #LinuxKernel

kernellogger, 21 days ago to random

A History of C Compilers - Part 1: Performance, Portability and Freedom

The first part of a whistle stop tour of the history of C compilers. Also GNU/Linux, dragons and lots of architectures!

https://thechipletter.substack.com/p/a-history-of-c-compilers-part-1-performance

kernellogger, 26 days ago (edited 26 days ago) to linux

The #Linux #kernel's #CVE team just published their thousandth CVE[1]. 🥳 🙃

This happened 78 days after the effort was announced[2].

Note, 26 of the 1003 CVE entries published so far were later rejected. For details check https://git.kernel.org/pub/scm/linux/security/vulns.git/ or https://lore.kernel.org/linux-cve-announce/

[1] https://git.kernel.org/pub/scm/linux/security/vulns.git/commit/?id=55441d0dd1f40c5762cd7cf8c9ca312ed0964c4a

[2] http://www.kroah.com/log/blog/2024/02/13/linux-is-a-cna/ #LinuxKernel

kernellogger, 26 days ago (edited 26 days ago) to linux

The Kernel Report - Jonathan Corbet (@corbet), @LWN

The recording of this recent talk is now available on the #ossna2024 schedule page: https://ossna2024.sched.com/event/1aBNs/the-kernel-report-jonathan-corbet-lwnnet

Slides can be found here: https://static.lwn.net/talks/2024/kr-ossna.pdf

Direct link to the recording: https://www.youtube.com/watch?v=DAqjl_x4hZc

#Linux #kernel #LinuxKernel

kernellogger, 27 days ago to random

The recording of Linus Torvalds' (@torvalds) fireside chat with Dirk Hohndel (@dirkhh) recently held at the #OpenSourceSummit North America is now online:

https://www.youtube.com/watch?v=cPvRIWXNgaM

kernellogger, 27 days ago to random

#Git v2.45.0 is out.

GitHub blog post with some highlights: https://github.blog/2024-04-29-highlights-from-git-2-45/

Announcement: https://lore.kernel.org/lkml/xmqq8r0ww0sj.fsf@gitster.g/

From the former:

'"[…] introduces preliminary support for a new reference storage backend called “reftable,” promising faster lookups, reads, and writes for repositories with any number of references. […]

Preliminary support for SHA-1 and SHA-256 interoperability

[…] git config learned a new option to help document your .gitconfig file […]"'

kernellogger, 28 days ago to linux

#Linux 6.9-rc6 is out:

https://lore.kernel.org/lkml/CAHk-=witYatGg+jW1kVu2Moq6yF2JNFe3wn7G0sMNhE=H=9voA@mail.gmail.com/

"'Things continue to look pretty normal, and nothing here really stands out. The biggest single change that stands out in the diffstat is literally a documentation update[1], […]

[…] please do keep testing,

Linus'"

[1] upps, sorry, guess that's my fault https://git.kernel.org/torvalds/c/4d2008430ce87061c9cefd4f83daf2d5bb323a96 🥴

#kernel #LinuxKernel

kernellogger, 1 month ago to linux

How Allegro reduced latency outliers by 82% by switching to #XFS:

https://blog.allegro.tech/2024/03/kafka-performance-analysis.html

"'Using a combination of packet sniffing, #eBPF, and async-profiler we managed to identify the root cause of slow produce requests in our Kafka cluster. We then tested a couple of solutions to the problem: data=writeback journaling mode, fast commits, and changing the file system to XFS.[…] With XFS, the number of produce requests exceeding 65ms (our SLO) was lowered by 82%.'"

#Linux #kernel #LinuxKernel

kernellogger, 1 month ago (edited 1 month ago) to linux

Getting closer and closer to the point where I'll start a git tree[1] with fixes and reverts for #Linux #kernel regressions in the latest stable series, as from here it seems quite a few of the known problems could quickly be solved by a revert or applying fixes already queued[2]/still under review[3].

[1] ideally in collaboration with the #LinuxKernel package maintainers from distros like @archlinux, @fedora, and @opensuse

[2] https://lore.kernel.org/all/a810561a-14f3-412e-9903-acaba7a36160@leemhuis.info/

[3] https://lore.kernel.org/all/ded3e7ae-6a7d-48b2-8acc-c125874ee09f@leemhuis.info/

kernellogger, 1 month ago to random

#QEMU 9.0.0 is out:

https://www.qemu.org/2024/04/23/qemu-9-0-0/

https://wiki.qemu.org/ChangeLog/9.0

"'block: virtio-blk now supports multiqueue where different queues of a single disk can be processed by different I/O threads

migration: support for “mapped-ram” capability allowing for more efficient VM snapshots, improved support for zero-page detection, and checkpoint-restart support for VFIO

ARM: architectural feature support for ECV, NV, and NV2

ARM: board support for […] raspi4b (Raspberry Pi 4 Model B)"'

kernellogger, 1 month ago to linux

[PATCH RFC 0/7] block: Introduce CBD (CXL Block Device)

https://lore.kernel.org/all/20240422071606.52637-1-dongsheng.yang@easystack.cn/

"'As shared memory is supported in CXL3.0 spec, we can transfer data via CXL shared memory. CBD means CXL block device, it use CXL shared memory to transfer command and data to access block device in different host […]

[…] any shared memory can be used for cbd, but I did not find out a better name, maybe smxbd(shared memory transport block device)? I choose CBD as […]"'

#Linux #Kernel #LinuxKernel

kernellogger, 1 month ago to linux

#Linux 6.9-rc5 is out:

https://lore.kernel.org/lkml/CAHk-=wgfck-6-2YcD3Bzhjo0E0L0g2HGSZksB9pzRCah=Y4HBw@mail.gmail.com/

"'Another week, another -rc. Things look fairly normal, […]'"

kernellogger, 1 month ago to linux

The infra for a "blue screen of death" in the #LinuxKernel has landed in #linux-next[1] and thus is slated for inclusion in #kernel 6.10:

https://lore.kernel.org/all/20240409163432.352518-1-jfalempe@redhat.com/

"'This introduces a new drm panic handler, which displays a message when a panic occurs. So when fbcon is disabled, you can still see a kernel panic.

[…]

It works with simpledrm, mgag200, ast, and imx.

[…]

Even if this is not yet useful, it will allows to work on more driver support, […]"'

[¹] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/?qt=grep&q=drm%2Fpanic