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Fri, 7 Mar 2025 15:30:14 +0800 From: Jinjiang Tu To: CC: , , , , , Subject: Re: Using userfaultfd with KVM's async page fault handling causes processes to hung waiting for mmap_lock to be released Date: Fri, 7 Mar 2025 15:21:33 +0800 Message-ID: <20250307072133.3522652-1-tujinjiang@huawei.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <79375b71-db2e-3e66-346b-254c90d915e2@cslab.ece.ntua.gr> References: <79375b71-db2e-3e66-346b-254c90d915e2@cslab.ece.ntua.gr> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.175.124.71] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To kwepemo200002.china.huawei.com (7.202.195.209) X-Rspam-User: X-Rspamd-Queue-Id: F2911100003 X-Rspamd-Server: rspam09 X-Stat-Signature: uoxnbsn6b6n7cx3umobonit6s3mqo66t X-HE-Tag: 1741332618-423873 X-HE-Meta: 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 fTFAv0Bg OxJxDnuGyfNy5b7EdV1XHgJCMmdB/WBJkoHDaMt2hFamkgsABEpkhSzDxO4OjtUg9pDMEIpNP/X5hyQgEjAAwBFPGBrYNgGGX/KyK/xr++4W0f5xG6xZmIq2C6vWHERpOLMPNeB81dVe4pt//61B381WXAD3CWvZJTJhx X-Bogosity: Ham, tests=bogofilter, spamicity=0.004843, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi, I encountered the same issue too. In my scenario, GUP is called by mlockall() syscall. Is there a solution to fix it? Thanks.