CVE-2026-89753
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]
How to fix
- Linux Linux4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57, 4cdc1bdf40944de5c6b118fef07ad23f07844338, a67a00a70a7c8309ca47ea157ef3e8ed3d268f5b, 029c9408049f7f582230322057b7075bea594fd5, b5391676c61d94ffe3272dcf6723738b802f79e8, 3fd50239986302cb050d3649351bcec00fa9d5ab, cf3ba0911a1cf8680371ff113b90088edd01d2bb, 25f52e81216884a7444bf07a606691feb09a94e3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 8315f42295d2667a7f942f154b73a86fd7cb2227 ≤ v < 4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57, 8315f42295d2667a7f942f154b73a86fd7cb2227 ≤ v < 4cdc1bdf40944de5c6b118fef07ad23f07844338, 8315f42295d2667a7f942f154b73a86fd7cb2227 ≤ v < a67a00a70a7c8309ca47ea157ef3e8ed3d268f5b, 8315f42295d2667a7f942f154b73a86fd7cb2227 ≤ v < 029c9408049f7f582230322057b7075bea594fd5, 8315f42295d2667a7f942f154b73a86fd7cb2227 ≤ v < b5391676c61d94ffe3272dcf6723738b802f79e8, 8315f42295d2667a7f942f154b73a86fd7cb2227 ≤ v < 3fd50239986302cb050d3649351bcec00fa9d5ab, 8315f42295d2667a7f942f154b73a86fd7cb2227 ≤ v < cf3ba0911a1cf8680371ff113b90088edd01d2bb, 8315f42295d2667a7f942f154b73a86fd7cb2227 ≤ v < 25f52e81216884a7444bf07a606691feb09a94e3, 3.18 | 4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57, 4cdc1bdf40944de5c6b118fef07ad23f07844338, a67a00a70a7c8309ca47ea157ef3e8ed3d268f5b, 029c9408049f7f582230322057b7075bea594fd5, b5391676c61d94ffe3272dcf6723738b802f79e8, 3fd50239986302cb050d3649351bcec00fa9d5ab, cf3ba0911a1cf8680371ff113b90088edd01d2bb, 25f52e81216884a7444bf07a606691feb09a94e3 |
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