From: Kefeng Wang <wangkefeng.wang@huawei.com>
To: Ron Economos <re@w6rz.net>, <linux-mm@kvack.org>,
<linux-kernel@vger.kernel.org>, <linux-riscv@lists.infradead.org>
Cc: <ziy@nvidia.com>, <jackmanb@google.com>, <david@redhat.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 20:58:30 +0800 [thread overview]
Message-ID: <64357180-b91a-4319-bd0f-5f09e38cebdb@huawei.com> (raw)
In-Reply-To: <1b17c38f-30d3-4bb4-a7e1-e74b19ada885@w6rz.net>
On 2026/2/24 16:37, 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
The refcount set to 1 when cma_alloc() by set_page_refcounted(), and it
will be dec to 0 in cma_release() by put_page_testzero(), there may be a
problem somewhere else?
Could you enable CONFIG_DEBUG_VM and CONFIG_DEBUG_PAGE_REF, and try to
track down page reference manipulation by tracepoint? or for CMA-related
pages, introduce explicit printk both increments and decrements of the
page reference count to identify the root cause of the issue.
next prev parent reply other threads:[~2026-02-24 12:58 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)
2026-02-24 12:58 ` Kefeng Wang [this message]
2026-02-24 13:25 ` Ron Economos
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