Riskcovery

CVE-2026-89753

mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec()

State
Published
Severity
Not scored
Published
Sep 11, 2026
Updated
Oct 19, 2026
Reserved
Sep 11, 2026

Read the record on cve.org

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]

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 8315f42295d2667a7f942f154b73a86fd7cb2227 to before 4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57Affected
  • 8315f42295d2667a7f942f154b73a86fd7cb2227 to before 4cdc1bdf40944de5c6b118fef07ad23f07844338Affected
  • 8315f42295d2667a7f942f154b73a86fd7cb2227 to before a67a00a70a7c8309ca47ea157ef3e8ed3d268f5bAffected
  • 8315f42295d2667a7f942f154b73a86fd7cb2227 to before 029c9408049f7f582230322057b7075bea594fd5Affected
  • 8315f42295d2667a7f942f154b73a86fd7cb2227 to before b5391676c61d94ffe3272dcf6723738b802f79e8Affected
  • 8315f42295d2667a7f942f154b73a86fd7cb2227 to before 3fd50239986302cb050d3649351bcec00fa9d5abAffected
  • 8315f42295d2667a7f942f154b73a86fd7cb2227 to before cf3ba0911a1cf8680371ff113b90088edd01d2bbAffected
  • 8315f42295d2667a7f942f154b73a86fd7cb2227 to before 25f52e81216884a7444bf07a606691feb09a94e3Affected
LinuxLinux
  • 3.18Affected
  • before 3.18Not affected
  • 5.10.270 through 5.10.*Not affected
  • 5.15.221 through 5.15.*Not affected
  • 6.1.188 through 6.1.*Not affected
  • 6.6.157 through 6.6.*Not affected
  • 6.12.109 through 6.12.*Not affected
  • 6.18.50 through 6.18.*Not affected
  • 7.2.4 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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