From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Waiman Long <longman@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Clark Williams <clrkwllms@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-rt-devel@lists.linux.dev,
Wei Yang <richard.weiyang@gmail.com>,
David Hildenbrand <david@kernel.org>,
"Paul E . McKenney" <paulmck@kernel.org>
Subject: Re: [PATCH v3] mm/mm_init: Don't cond_resched() in deferred_init_memmap_chunk() if called from deferred_grow_zone()
Date: Fri, 23 Jan 2026 08:24:22 +0100 [thread overview]
Message-ID: <20260123072422.rOwJDb5K@linutronix.de> (raw)
In-Reply-To: <20260122184343.546627-1-longman@redhat.com>
On 2026-01-22 13:43:43 [-0500], Waiman Long wrote:
…
> bug report.
>
> BUG: sleeping function called from invalid context at mm/mm_init.c:2091
> in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper/0
> preempt_count: 0, expected: 0
> RCU nest depth: 1, expected: 0
> 3 locks held by swapper/0/1:
> #0: ffff80008471b7a0 (sched_domains_mutex){+.+.}-{4:4}, at: sched_domains_mutex_lock+0x28/0x40
> #1: ffff003bdfffef48 (&pgdat->node_size_lock){+.+.}-{3:3}, at: deferred_grow_zone+0x140/0x278
> #2: ffff800084acf600 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1b4/0x408
> CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.19.0-rc6-test #1 PREEMPT_{RT,(full)
> }
> Tainted: [W]=WARN
> Call trace:
> show_stack+0x20/0x38 (C)
> dump_stack_lvl+0xdc/0xf8
> dump_stack+0x1c/0x28
> __might_resched+0x384/0x530
> deferred_init_memmap_chunk+0x560/0x688
> deferred_grow_zone+0x190/0x278
> _deferred_grow_zone+0x18/0x30
> get_page_from_freelist+0x780/0xf78
> __alloc_frozen_pages_noprof+0x1dc/0x348
> alloc_slab_page+0x30/0x110
> allocate_slab+0x98/0x2a0
> new_slab+0x4c/0x80
> ___slab_alloc+0x5a4/0x770
> __slab_alloc.constprop.0+0x88/0x1e0
> __kmalloc_node_noprof+0x2c0/0x598
> __sdt_alloc+0x3b8/0x728
> build_sched_domains+0xe0/0x1260
> sched_init_domains+0x14c/0x1c8
> sched_init_smp+0x9c/0x1d0
> kernel_init_freeable+0x218/0x358
> kernel_init+0x28/0x208
> ret_from_fork+0x10/0x20
I would strip this report because the call chain is simple and there
just one so it is not one of many and hard to find.
…
>
> Fixes: 3acb913c9d5b ("mm/mm_init: use deferred_init_memmap_chunk() in deferred_grow_zone()")
> Suggested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Sebastian
next prev parent reply other threads:[~2026-01-23 7:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-22 18:43 Waiman Long
2026-01-22 19:29 ` Andrew Morton
2026-01-22 20:56 ` Waiman Long
2026-01-23 8:46 ` Mike Rapoport
2026-01-23 7:24 ` Sebastian Andrzej Siewior [this message]
2026-01-23 8:47 ` Mike Rapoport
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