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b=gN62UtsA6LT4fYW6UioynrJkR2jF1vx72Sxb4EktxYCQz/zxjx/HO1ha2EMV/7sDK +0NB0gB8lOBEu4loFmQCQxGpmN+7aneDObggIC4edrgt8DWDGweEEehPLen5nFEhaT CUL6Xixlwz2wUYr/ootObaPXd7N1WAxIQcK2f8LragVSfwtCcGkUbYuK69EnCipb2j uehBhQK6QDOMZelnhk4WsWgMfx/v8IaVKdVi/lvgAUIorRPwN03QpE5pNLzlZk+ayo 3MszTbK4fMkTuPeOxLnRxJOFAlhvtnchTF8TUBuDwSh/bc7NXLf6fv5sFbG+oIMp6L nwFKYnQu6lT5Q== Message-ID: <13b8d60d-1209-4650-9fa5-982381c53512@kernel.org> Date: Tue, 24 Feb 2026 12:00:17 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: mm: Regression with v7.0-rc1 on RISC-V To: Ron Economos , 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 , akpm@linux-foundation.org, pjw@kernel.org References: <1b17c38f-30d3-4bb4-a7e1-e74b19ada885@w6rz.net> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-Stat-Signature: ucktw5y37qnb1h8djjiotpu4yfem5or1 X-Rspam-User: X-Rspamd-Queue-Id: 1BCDA1A000E X-Rspamd-Server: rspam01 X-HE-Tag: 1771930824-387727 X-HE-Meta: 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 zz/MaDtR VME68WWnERp/Jxm3Er0TvGj9YQn+YVal3AKqCkurGATAQW4PZNRv57wCOWuhPFcamxuKV3LV+iZSDmWAFao+AXbJKHywtV1rYVuCrj9dGwVVyQlsSZmZFLX6hbi9l3MbIQTZGujB+Qlmcf+CjzI1F/S9sXUY7ppn77hyg/JXsAPtFMcdt5Vnj2ludkhgRVbx0RaLTEV6C+7q4ogPOBiMNL4XAE+rIzHqVP2PWVlBCGc/vnvj+GwdOVWq8exAjRrwiCTlo65i3KQZeKoGauDnWFrzzf/G6+MHLhJ18 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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