From: Ron Economos <re@w6rz.net>
To: Kefeng Wang <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, 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 05:25:06 -0800 [thread overview]
Message-ID: <30dd1efc-9bd9-4664-999e-610d181600f9@w6rz.net> (raw)
In-Reply-To: <64357180-b91a-4319-bd0f-5f09e38cebdb@huawei.com>
On 2/24/26 04:58, Kefeng Wang wrote:
>
>
> 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.
>
Something strange is going on. I enabled CONFIG_DEBUG_VM by itself and the issue went away. Let me try CONFIG_DEBUG_PAGE_REF.
prev parent reply other threads:[~2026-02-24 13:25 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
2026-02-24 13:25 ` Ron Economos [this message]
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