From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Ron Economos <re@w6rz.net>,
wangkefeng.wang@huawei.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org
Cc: ziy@nvidia.com, jackmanb@google.com, jane.chu@oracle.com,
hannes@cmpxchg.org, willy@infradead.org, muchun.song@linux.dev,
osalvador@suse.de, sidhartha.kumar@oracle.com, vbabka@suse.cz,
claudiu.beznea.uj@bp.renesas.com, Mark Brown <broonie@kernel.org>,
akpm@linux-foundation.org, pjw@kernel.org
Subject: Re: mm: Regression with v7.0-rc1 on RISC-V
Date: Tue, 24 Feb 2026 12:00:17 +0100 [thread overview]
Message-ID: <13b8d60d-1209-4650-9fa5-982381c53512@kernel.org> (raw)
In-Reply-To: <1b17c38f-30d3-4bb4-a7e1-e74b19ada885@w6rz.net>
On 2/24/26 09:37, Ron Economos wrote:
> I'm getting a BUG dump during shutdown with Linux v7.0-rc1 on RISC-V.
>
> [ OK ] Reached target shutdown.target - System Shutdown.
> [ OK ] Reached target final.target - Late Shutdown Services.
> [ OK ] Finished systemd-reboot.service - System Reboot.
> [ OK ] Reached target reboot.target - System Reboot.
> [ 173.985249] BUG: Bad page state in process shutdown pfn:f8850
> [ 173.985311] page: refcount:1 mapcount:0 mapping:0000000000000000
> index:0x0 pfn:0xf8850
> [ 173.985336] flags: 0xffff80000000000(node=0|zone=0|
> lastcpupid=0x1ffff) CMA
> [ 173.985365] raw: 0ffff80000000000 ffffffc501e21448 ffffffc600f2ae88
> 0000000000000000
> [ 173.985386] raw: 0000000000000000 0000000000000000 00000001ffffffff
> 0000000000000000
> [ 173.985403] page dumped because: nonzero _refcount
So, we're freeing something from CMA in cma_release().
In cma_release() we iterate all pages to decrement their refcount
VM_WARN_ON(!put_page_testzero(pfn_to_page(pfn)));
I would expect that this would fire already if there is still a page
referenced.
Are you running with CONFIG_DEBUG_VM=y ?
--
Cheers,
David
next prev parent reply other threads:[~2026-02-24 11:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-24 8:37 Ron Economos
2026-02-24 11:00 ` David Hildenbrand (Arm) [this message]
2026-02-24 12:58 ` Kefeng Wang
2026-02-24 13:25 ` Ron Economos
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