--- title: Hangs & Performance Regression On Large Systems Fixed... description: The Linux 7.0-rc4 release includes critical scheduler fixes stemming from the mm/cid rewrite introduced last November. Key fixes address CID hangs caused by... canonical: https://daily.dev/posts/hangs-performance-regression-on-large-systems-fixed-for-linux-7-0-rc4-i6pfbblwh twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Hangs & Performance Regression On Large Systems Fixed For Linux 7.0-rc4 | daily.dev og:description: The Linux 7.0-rc4 release includes critical scheduler fixes stemming from the mm/cid rewrite introduced last November. Key fixes address CID hangs caused by... og:url: https://daily.dev/posts/hangs-performance-regression-on-large-systems-fixed-for-linux-7-0-rc4-i6pfbblwh og:image: https://api.daily.dev/og/posts/I6PfBBlwh.png og:image:alt: Hangs & Performance Regression On Large Systems Fixed For Linux 7.0-rc4 og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Hangs & Performance Regression On Large Systems Fixed For Linux 7.0-rc4 **[Phoronix](https://daily.dev/sources/phoronix)** · 2 min read · 0 upvotes · 0 comments ## Summary The Linux 7.0-rc4 release includes critical scheduler fixes stemming from the mm/cid rewrite introduced last November. Key fixes address CID hangs caused by race conditions during concurrent forks and vfork()/CLONE_VM bugs, plus a performance regression on large systems where the slow for_each_process_thread() counting logic in mm_cid fixup tasks has been replaced with a simpler sched_mm_cid::node list. A separate x86/urgent fix resolves suspend-to-RAM hangs caused by firmware unexpectedly re-enabling x2apic mode after the kernel had disabled it, with the fix disabling x2apic on resume when the kernel expects it off. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Linux 7.0-rc4 Released With Hang Fixes, Resolves At Least One Performance Regression](https://daily.dev/posts/linux-7-0-rc4-released-with-hang-fixes-resolves-at-least-one-performance-regression-ybnz9n91d) · Phoronix · 0 upvotes · 0 comments - [Linux 6.19 Sees Last Minute Scheduler Regression Fixes](https://daily.dev/posts/linux-6-19-sees-last-minute-scheduler-regression-fixes-5zad8xxly) · Phoronix · 0 upvotes · 0 comments - [One kernel feature, 93% system throughput gone: A Red Hat Enterprise Linux 10.2 kernel regression and how to mitigate it](https://daily.dev/posts/one-kernel-feature-93-system-throughput-gone-a-red-hat-enterprise-linux-10-2-kernel-regression-an-zefh5aaqc) · Red Hat Developer · 14 upvotes · 1 comments --- Tags: [#linux](https://daily.dev/tags/linux) [View this post on daily.dev](https://daily.dev/posts/hangs-performance-regression-on-large-systems-fixed-for-linux-7-0-rc4-i6pfbblwh) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Hangs & Performance Regression On Large Systems Fixed For Linux 7.0-rc4","url":"https://daily.dev/posts/hangs-performance-regression-on-large-systems-fixed-for-linux-7-0-rc4-i6pfbblwh","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/hangs-performance-regression-on-large-systems-fixed-for-linux-7-0-rc4-i6pfbblwh"},"datePublished":"2026-03-15T11:01:23.026Z","dateModified":"2026-03-15T11:04:03.152Z","description":"The Linux 7.0-rc4 release includes critical scheduler fixes stemming from the mm/cid rewrite introduced last November. 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