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: <46ac83f7-d3e0-b667-7352-d853938c9fc9@huawei.com>
Date: Fri, 7 Mar 2025 16:07:57 +0800
From: Jinjiang Tu <tujinjiang@...wei.com>
To: <jimsiak@...ab.ece.ntua.gr>, <peterx@...hat.com>
CC: <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<viro@...iv.linux.org.uk>, <linux-mm@...ck.org>, <wangkefeng.wang@...wei.com>
Subject: Re: Using userfaultfd with KVM's async page fault handling causes
 processes to hung waiting for mmap_lock to be released

cc Peter Xu

在 2025/3/7 15:21, Jinjiang Tu 写道:
> Hi,
>
> I encountered the same issue too. In my scenario, GUP is called by mlockall()
> syscall.
>
> Is there a solution to fix it?
>
> Thanks.
>