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Sun, 12 Jan 2025 20:51:31 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 18120257315158823718 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3818.100.11.1.3\)) Subject: Re: Bug: task hung in shmem_swapin_folio From: Kun Hu In-Reply-To: Date: Sun, 12 Jan 2025 20:51:20 +0800 Cc: hch@lst.de, jlayton@kernel.org, kirill.shutemov@linux.intel.com, vbabka@suse.cz, william.kucharski@oracle.com, rppt@linux.ibm.com, dhowells@redhat.com, akpm@linux-foundation.org, hughd@google.com, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Message-Id: <431D467D-10F3-4316-A34B-6C1315178B05@m.fudan.edu.cn> References: To: Matthew Wilcox X-Mailer: Apple Mail (2.3818.100.11.1.3) X-QQ-SENDSIZE: 520 Feedback-ID: bizesmtpsz:m.fudan.edu.cn:qybglogicsvrgz:qybglogicsvrgz8a-1 X-QQ-XMAILINFO: NWujniBqiFoNJb0gHwP8ocNkLLy6fhUA3B97/3P7GAv0Zh3abXMFUGtH xApsZO1jiQ5T53hv5zgfRKEm65/5I/APjtdILr8FE49VQ8nd7EihZxSkV1FqHsnYwKq62kK W/3s128TcMkTsP5tD+regsCsPbDibk8FkFGtnUfesZ0ihgwQUDzzrqJ8VsDxFDDA6+xutJt DEs4GJE5dVD2ASR6xLAzGsSzGkT4eqVurZf2Dh+4fYC6xwQ5Cffwx8JWt6aln4nPLfd2yXp Qckbk2d+kUdmTYT58GrwBCFo/BY/Rh59zOUA0p+OQRzEXeq/7z2m/jrLG2QNcJgAAluWyBL fCANi53kA7oknlf4IIGzCOHmWq1w8pdTN5eYYE0QWj4zt/smi40kRaJntqHbR+r/Po9ZrpE 6Xv06RNP12sLMatnviA1/UqYRNQ0dkR1b+o1ALTI5lwqiN2OAb98/U5Lm/bswGise6MDPQz 2wA1HYLtcV8LFWzbt7B+JSO38wIbAK4YQFmORvQP/q2oLw22QLg9JwbmBJjeNIdMju5KtqQ B9BsIq4sFWC+OZ8qHmxyP8mS7kyv2UpdwnXhQGsnwpm0XCFOGbN6JwKKGMJP+jXBSr3HH5s jCA6VGPyS4lBa9dWbtpDhJHDm483OkFgjOugGj2UAZt5RGXe24M6rqApItruH3TXqKXivC6 UJX82UIIbtqPLPaU1Uc5dLMywEXwXq3e2ZEHfShfcFDzz4lpMvg4I2WKDW8u31eXBn0xf0E Rt9oXe5chTWotT1/d9v3kAsKyHPiGAbm6btiK+3KuOizPxzILEwXlWYFWvP5aTzWj94sG/j xKgeGY8I6xpOgnx05JA/zHn6elTHCrJolTejYr3TO6sXeEW6ht7Qnmq0XWFOpryjJGLagh8 nfuimrpeAQSeMkmMK2kvZ3tK9cxnOVQ0FUOVK3kO7eEPj/HK4YnQj4kRjZ89ZHHIZUgf8CO LWssYgfF96ugOd87TgRlsraAIkyGL2hTO44wGl3D3cW4E6A== X-QQ-XMRINFO: OD9hHCdaPRBwq3WW+NvGbIU= X-QQ-RECHKSPAM: 0 X-Stat-Signature: 3souno16sytwiu65un3oa53kfxru7k9a X-Rspam-User: X-Rspamd-Queue-Id: 72CF51C0007 X-Rspamd-Server: rspam08 X-HE-Tag: 1736686338-802130 X-HE-Meta: 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 +dRPDnvu oFonhdKghEOBKSbb4Zbrdh20+x5/f8vvWiA6OThEFf3OgcesJ9EJQcDirSGTt4DQb1Ap6V8e3WilVkdx74zjlf4m6dc9ctCw8AlXI17cSGqS524J8iNd1aRHx2qFVWzfPYAHwBPtgvRmlfaShxKSNDKjXkwcjkiy2AtEuWQru087FiFpMrSxh8MBco8v5YcWyivQL8THGuq9Pb/WtoukWGmZdp0UqFZtOYsq6wqf2SdCWiJcpB9frE3/tN70gFYOdev+susEnkNV5UeqEIkrgdOFB5u5Wp4NUe1E0ogPHsGEGIdvn45gYAnLCYg9vSmwgPpz2ey38M3Zz3b1dBpdX9SZ0+dMCA4NoXx7cIbV0SchX0SznUv1a6ySG4O3QdGGdyIKTtmRhfd5SvVfcad27YH1HZ6OS6eqZVbcM/Fr7u/zl40hBwLVb0IFSzkYiPugr/k04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000458, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > 2025=E5=B9=B41=E6=9C=8812=E6=97=A5 20:02=EF=BC=8CMatthew Wilcox = =E5=86=99=E9=81=93=EF=BC=9A >=20 > On Sun, Jan 12, 2025 at 05:46:24PM +0800, Kun Hu wrote: >> Hello, >>=20 >> When using our customized fuzzer tool to fuzz the latest Linux = kernel, the following crash (42s) >> was triggered. >=20 > It's not a crash. It's a warning. You've just configured your kernel > to crash when emitting a warning. >=20 > What you need to do is poke around in the reproducer you've found and > figure out what it is you're doing that causes this warning. Are > you constraining your task with memory groups, for example? Are you > doing a huge amount of I/O which is causing your disk to be > bottlenecked? Something else? >=20 > It's all very well to automate finding bugs, but you're asking other > people to do a lot of the work for you. >=20 Thank you very much and sorry at the same time. We know that most of the work of locating a issue should be done by the = reporter, but having just looked into fuzzing against the kernel, the = background knowledge of the kernel is not very familiar at the moment. = That's why we've taken the approach of sending out a report first, and = after getting professional feedback from the maintainers, we're able to = target test a particular subsystem or module for them to improve = efficiency. Our strategy seems to be incorrect and certainly due to our lack of = Kernel expertise, again I apologize, we will improve and hopefully = report really useful information. =E2=80=94=E2=80=94=E2=80=94=E2=80=94 Thanks, Kun Hu=