* [BUG] rcu_tasks detected stalls in kcompactd during proactive compaction
@ 2026-03-24 8:26 ying chen
2026-03-27 2:47 ` Fwd: " ying chen
0 siblings, 1 reply; 2+ messages in thread
From: ying chen @ 2026-03-24 8:26 UTC (permalink / raw)
To: linux-mm, linux-kernel, paulmck, akpm
Hi all,
I encountered an RCU tasks stall issue triggered by kcompactd0 on my
system.Below are the details of the incident:
Kernel Version：6.1.0-x
vm.compaction_proactiveness = 20
CONFIG_PREEMPT_RCU=y
[Sun Mar 22 16:36:04 2026] INFO: rcu_tasks detected stalls on tasks:
[Sun Mar 22 16:36:04 2026] 00000000fcafb4d6: .. nvcsw: 622963/622963
holdout: 1 idle_cpu: -1/1
[Sun Mar 22 16:36:04 2026] task:kcompactd0 state:R running task
stack:0 pid:1943
[Sun Mar 22 16:36:04 2026] Call Trace:
[Sun Mar 22 16:36:04 2026] <TASK>
[Sun Mar 22 16:36:04 2026] ? rmap_walk_anon+0x16b/0x330
[Sun Mar 22 16:36:04 2026] ? try_to_migrate+0x96/0x110
[Sun Mar 22 16:36:04 2026] ? try_to_unmap_one+0xd0/0xd0
[Sun Mar 22 16:36:04 2026] ? anon_vma_ctor+0x50/0x50
[Sun Mar 22 16:36:04 2026] ? folio_get_anon_vma+0x90/0x90
[Sun Mar 22 16:36:04 2026] ? invalid_mkclean_vma+0x20/0x20
[Sun Mar 22 16:36:04 2026] ? __unmap_and_move+0x21e/0x340
[Sun Mar 22 16:36:04 2026] ? free_unref_page+0x17d/0x1f0
[Sun Mar 22 16:36:04 2026] ? release_freepages+0xc0/0xc0
[Sun Mar 22 16:36:04 2026] ? release_freepages+0xc0/0xc0
[Sun Mar 22 16:36:04 2026] ? unmap_and_move+0xaa/0x4c0
[Sun Mar 22 16:36:04 2026] ? migrate_pages+0x3a9/0x790
[Sun Mar 22 16:36:04 2026] ? release_freepages+0xc0/0xc0
[Sun Mar 22 16:36:04 2026] ? isolate_migratepages+0x2a0/0x2a0
[Sun Mar 22 16:36:04 2026] ? compact_zone+0x310/0x5d0
[Sun Mar 22 16:36:04 2026] ? proactive_compact_node+0x88/0xc0
[Sun Mar 22 16:36:04 2026] ? kcompactd+0x365/0x3f0
[Sun Mar 22 16:36:04 2026] ? membarrier_register_private_expedited+0xa0/0xa0
[Sun Mar 22 16:36:04 2026] ? kcompactd_do_work+0x2a0/0x2a0
[Sun Mar 22 16:36:04 2026] ? kthread+0xeb/0x120
^ permalink raw reply [flat|nested] 2+ messages in thread
* Fwd: [BUG] rcu_tasks detected stalls in kcompactd during proactive compaction
2026-03-24 8:26 [BUG] rcu_tasks detected stalls in kcompactd during proactive compaction ying chen
@ 2026-03-27 2:47 ` ying chen
0 siblings, 0 replies; 2+ messages in thread
From: ying chen @ 2026-03-27 2:47 UTC (permalink / raw)
To: akpm, linux-mm, linux-kernel, paulmck, frederic, quic_neeraju,
josh, Steven Rostedt, mathieu.desnoyers, jiangshanlai, joel, rcu
---------- Forwarded message ---------
From: ying chen <yc1082463@gmail.com>
Date: Tue, Mar 24, 2026 at 4:26 PM
Subject: [BUG] rcu_tasks detected stalls in kcompactd during proactive
compaction
To: <linux-mm@kvack.org>, <linux-kernel@vger.org>,
<paulmck@kernel.org>, <akpm@linux-foundation.org>
Hi all,
I encountered an RCU tasks stall issue triggered by kcompactd0 on my
system.Below are the details of the incident:
Kernel Version：6.1.0-x
vm.compaction_proactiveness = 20
CONFIG_PREEMPT_RCU=y
[Sun Mar 22 16:36:04 2026] INFO: rcu_tasks detected stalls on tasks:
[Sun Mar 22 16:36:04 2026] 00000000fcafb4d6: .. nvcsw: 622963/622963
holdout: 1 idle_cpu: -1/1
[Sun Mar 22 16:36:04 2026] task:kcompactd0 state:R running task
stack:0 pid:1943
[Sun Mar 22 16:36:04 2026] Call Trace:
[Sun Mar 22 16:36:04 2026] <TASK>
[Sun Mar 22 16:36:04 2026] ? rmap_walk_anon+0x16b/0x330
[Sun Mar 22 16:36:04 2026] ? try_to_migrate+0x96/0x110
[Sun Mar 22 16:36:04 2026] ? try_to_unmap_one+0xd0/0xd0
[Sun Mar 22 16:36:04 2026] ? anon_vma_ctor+0x50/0x50
[Sun Mar 22 16:36:04 2026] ? folio_get_anon_vma+0x90/0x90
[Sun Mar 22 16:36:04 2026] ? invalid_mkclean_vma+0x20/0x20
[Sun Mar 22 16:36:04 2026] ? __unmap_and_move+0x21e/0x340
[Sun Mar 22 16:36:04 2026] ? free_unref_page+0x17d/0x1f0
[Sun Mar 22 16:36:04 2026] ? release_freepages+0xc0/0xc0
[Sun Mar 22 16:36:04 2026] ? release_freepages+0xc0/0xc0
[Sun Mar 22 16:36:04 2026] ? unmap_and_move+0xaa/0x4c0
[Sun Mar 22 16:36:04 2026] ? migrate_pages+0x3a9/0x790
[Sun Mar 22 16:36:04 2026] ? release_freepages+0xc0/0xc0
[Sun Mar 22 16:36:04 2026] ? isolate_migratepages+0x2a0/0x2a0
[Sun Mar 22 16:36:04 2026] ? compact_zone+0x310/0x5d0
[Sun Mar 22 16:36:04 2026] ? proactive_compact_node+0x88/0xc0
[Sun Mar 22 16:36:04 2026] ? kcompactd+0x365/0x3f0
[Sun Mar 22 16:36:04 2026] ? membarrier_register_private_expedited+0xa0/0xa0
[Sun Mar 22 16:36:04 2026] ? kcompactd_do_work+0x2a0/0x2a0
[Sun Mar 22 16:36:04 2026] ? kthread+0xeb/0x120
^ permalink raw reply [flat|nested] 2+ messages in thread
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