linux-kernel - Re: Using userfaultfd with KVM's async page fault handling causes processes to hung waiting for mmap

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Message-ID: <20250307072133.3522652-1-tujinjiang@huawei.com>
Date: Fri, 7 Mar 2025 15:21:33 +0800
From: Jinjiang Tu <tujinjiang@...wei.com>
To: <jimsiak@...ab.ece.ntua.gr>
CC: <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<viro@...iv.linux.org.uk>, <linux-mm@...ck.org>,
	<wangkefeng.wang@...wei.com>, <tujinjiang@...wei.com>
Subject: Re: Using userfaultfd with KVM's async page fault handling causes processes to hung waiting for mmap_lock to be released

Hi,

I encountered the same issue too. In my scenario, GUP is called by mlockall()
syscall.

Is there a solution to fix it?

Thanks.