mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec() (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.18 % · percentile 7 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
In the Linux kernel, the following vulnerability has been resolved: mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec() I am seeing some rcu_tasks stalls in the Meta fleet during reclaim. INFO: rcu_tasks detected stalls on tasks: 0000000088620d09: .. nvcsw: 6735/6735 holdout: 1 idle_cpu: -1/8 task:GlobalCPUThread state:R running task pid:2552016 tgid:2524552 Call Trace: shrink_lruvec mem_cgroup_iter shrink_node do_try_to_free_pages try_to_free_pages __alloc_frozen_pages_noprof alloc_pages_noprof pte_alloc_one __pte_alloc handle_mm_fault Nothing promises direct reclaim returns in bounded time, and the scan loop in shrink_lruvec() only calls cond_resched(), which is a no-op on PREEMPTION kernels. Involuntary preemption is not a Tasks-RCU quiescent state, so the reclaiming task never reports one and becomes a holdout. Upgrade it to cond_resched_tasks_rcu_qs(), which reports a quiescent state even when cond_resched() does nothing. PS: This has been discussed in [1]
References
- https://git.kernel.org/stable/c/4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57
- https://git.kernel.org/stable/c/4cdc1bdf40944de5c6b118fef07ad23f07844338
- https://git.kernel.org/stable/c/a67a00a70a7c8309ca47ea157ef3e8ed3d268f5b
- https://git.kernel.org/stable/c/029c9408049f7f582230322057b7075bea594fd5
- https://git.kernel.org/stable/c/b5391676c61d94ffe3272dcf6723738b802f79e8
- https://git.kernel.org/stable/c/3fd50239986302cb050d3649351bcec00fa9d5ab
- https://git.kernel.org/stable/c/cf3ba0911a1cf8680371ff113b90088edd01d2bb
- https://git.kernel.org/stable/c/25f52e81216884a7444bf07a606691feb09a94e3
European references
- ENISA EUVD · EUVD-2026-76665
- GCVE · GCVE-0-2026-89753
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1375 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1289 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1253 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 8315f42295d2667a7f942f154b73a86fd7cb2227 < 4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57 ; affected 8315f42295d2667a7f942f154b73a86fd7cb2227 < 4cdc1bdf40944de5c6b118fef07ad23f07844338 ; affected 8315f42295d2667a7f942f154b73a86fd7cb2227 < a67a00a70a7c8309ca47ea157ef3e8ed3d268f5b ; affected 8315f42295d2667a7f942f154b73a86fd7cb2227 < 029c9408049f7f582230322057b7075bea594fd5 ; affected 8315f42295d2667a7f942f154b73a86fd7cb2227 < b5391676c61d94ffe3272dcf6723738b802f79e8 ; affected 8315f42295d2667a7f942f154b73a86fd7cb2227 < 3fd50239986302cb050d3649351bcec00fa9d5ab |
| Linux · Linux | affected 3.18 ; unaffected 0 < 3.18 ; unaffected 5.10.270 ≤ 5.10.* ; unaffected 5.15.221 ≤ 5.15.* ; unaffected 6.1.188 ≤ 6.1.* ; unaffected 6.6.157 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |