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Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.5.1 Subject: Re: [PATCH v2] mm: hwpoison: coredump: support recovery from dump_user_range() Content-Language: en-US To: =?UTF-8?B?SE9SSUdVQ0hJIE5BT1lBKOWggOWPoyDnm7TkuZ8p?= CC: "Luck, Tony" , "chu, jane" , Thomas Gleixner , Alexander Viro , Christian Brauner , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" , Andrew Morton , Miaohe Lin , "linux-kernel@vger.kernel.org" , Tong Tiangen , Jens Axboe References: <9a9876a2-a2fd-40d9-b215-3e6c8207e711@huawei.com> <20230421031356.GA3048466@hori.linux.bs1.fc.nec.co.jp> <1bd6a635-5a3d-c294-38ce-5c6fcff6494f@huawei.com> <20230424064427.GA3267052@hori.linux.bs1.fc.nec.co.jp> <316b5a9e-5d5f-3bcf-57c1-86fafe6681c3@huawei.com> <6b350187-a9a5-fb37-79b1-bf69068f0182@huawei.com> <20230427023045.GA3499768@hori.linux.bs1.fc.nec.co.jp> From: Kefeng Wang In-Reply-To: <20230427023045.GA3499768@hori.linux.bs1.fc.nec.co.jp> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: C094A100007 X-Stat-Signature: 1yccaceys6q6dfc71uhsyf7wkio1ztg1 X-HE-Tag: 1682672216-434731 X-HE-Meta: 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 s6V+OWko R+wI/ZgxCXoVTJP3ywjn33e5Jszvjg0RSJzJYN/l7rRKkMYsJA5lI8VhgoHqmZWffbG/uwM3IdcisAe1eO+cx7GyDDSJFoSFqtRWs1xQWvaxZTNDZ5yDFw7D2kbp9GFZDgb92ebOleidctYWDDe93Pa6Oe93pnjtAB4qf5bek7oTlFicX6uoJidjBoqqS8iYura7rN2brzQw+wJoJrJDFjOVwi1J5Afs2jFZ0 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: On 2023/4/27 10:31, HORIGUCHI NAOYA(堀口 直也) wrote: > On Thu, Apr 27, 2023 at 09:06:46AM +0800, Kefeng Wang wrote: >> >> ... >> For coredump，the task work will be called too, see following code, >> >> get_signal >> sig_kernel_coredump >> elf_core_dump >> dump_user_range >> _copy_from_iter // with MC-safe copy, return without panic >> do_group_exit(ksig->info.si_signo); >> do_exit >> exit_task_work >> task_work_run >> kill_me_never >> memory_failure >> >> I also add debug print to check the memory_failure() processing after >> add MCE_IN_KERNEL_COPYIN to MCE_SAFE exception type, also tested CoW of >> normal page and huge page, it works too. > > Sounds nice to me. > Maybe this information is worth documenting in the patch description. > Sure, will make a formal patch and send out, thanks. > Thanks, > Naoya Horiguchi