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Tue, 24 Feb 2026 20:53:52 +0800 (CST) Received: from dggpemf100008.china.huawei.com (unknown [7.185.36.138]) by mail.maildlp.com (Postfix) with ESMTPS id D068140565; Tue, 24 Feb 2026 20:58:33 +0800 (CST) Received: from [10.174.177.243] (10.174.177.243) by dggpemf100008.china.huawei.com (7.185.36.138) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 24 Feb 2026 20:58:32 +0800 Message-ID: <64357180-b91a-4319-bd0f-5f09e38cebdb@huawei.com> Date: Tue, 24 Feb 2026 20:58:30 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: mm: Regression with v7.0-rc1 on RISC-V To: Ron Economos , , , CC: , , , , , , , , , , , Mark Brown , , References: <1b17c38f-30d3-4bb4-a7e1-e74b19ada885@w6rz.net> Content-Language: en-US From: Kefeng Wang In-Reply-To: <1b17c38f-30d3-4bb4-a7e1-e74b19ada885@w6rz.net> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: kwepems200002.china.huawei.com (7.221.188.68) To dggpemf100008.china.huawei.com (7.185.36.138) X-Stat-Signature: z3d5jbhx5seia4bwjumw93pf7cfccqkb X-Rspam-User: X-Rspamd-Queue-Id: 5D4A040013 X-Rspamd-Server: rspam01 X-HE-Tag: 1771937917-280667 X-HE-Meta: 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 ZyFSxNCc FICcFZawl12PLAqQQNewUu6GL22d+3V5qefpYAMZKm1QMteIOX1g9uxNeGB8OeNqeEuLDOkPYi7l3mXX2n9wY7wOOyCU/S/lDSlVI1QbnXRg0mfR83GilNFwesLva3oxc7QLYAbrD8SBzU+wh05ofUloghARAj9gidogA+gFYlQzGdR9dQWEJa9yl94p0I5kn1F5+IQOmkQVUdpiEEujb2nqX/3/Ql0JcV/UKapBsDedzNMpt5dieXoyDxGfPkikuiu9wdI+Ai9GGKZ0F7OAT3yzDKdu0/WkEaTcy3A9BJd9/qTnAYn3MMzTMi6h1B7SyovHU1R1Ljq+MJcfxcB88H6UK7A== 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 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.