Re: Using userfaultfd with KVM's async page fault handling causes processes to hung waiting for mmap_lock to be released

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To: Jinjiang Tu <tujinjiang@xxxxxxxxxx>
Subject: Re: Using userfaultfd with KVM's async page fault handling causes processes to hung waiting for mmap_lock to be released
From: Peter Xu <peterx@xxxxxxxxxx>
Date: Wed, 12 Mar 2025 10:09:29 -0400
Cc: jimsiak <jimsiak@xxxxxxxxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, wangkefeng.wang@xxxxxxxxxx
In-reply-to: <20a6b1c1-389e-b57a-7a5c-d1b0a7185412@huawei.com>
References: <79375b71-db2e-3e66-346b-254c90d915e2@cslab.ece.ntua.gr> <20250307072133.3522652-1-tujinjiang@huawei.com> <46ac83f7-d3e0-b667-7352-d853938c9fc9@huawei.com> <dee238e365f3727ab16d6685e186c53c@cslab.ece.ntua.gr> <Z8t2Np8fOM9jWmuu@x1.local> <bb6eb768-2e3b-0419-6a7d-9ed9165a2024@huawei.com> <Z880ejmfqjY1cuX7@x1.local> <bb6bba1d-fabe-cc14-2521-ffbf2e31ac63@huawei.com> <20a6b1c1-389e-b57a-7a5c-d1b0a7185412@huawei.com>

On Wed, Mar 12, 2025 at 05:18:26PM +0800, Jinjiang Tu wrote:
> Since this patch works, could you please send a formal patch to maillist?

Will do it later today, thanks.

-- 
Peter Xu

References:
- Re: Using userfaultfd with KVM's async page fault handling causes processes to hung waiting for mmap_lock to be released
  - From: jimsiak
- Re: Using userfaultfd with KVM's async page fault handling causes processes to hung waiting for mmap_lock to be released
  - From: Peter Xu
- Re: Using userfaultfd with KVM's async page fault handling causes processes to hung waiting for mmap_lock to be released
  - From: Jinjiang Tu
- Re: Using userfaultfd with KVM's async page fault handling causes processes to hung waiting for mmap_lock to be released
  - From: Peter Xu
- Re: Using userfaultfd with KVM's async page fault handling causes processes to hung waiting for mmap_lock to be released
  - From: Jinjiang Tu
- Re: Using userfaultfd with KVM's async page fault handling causes processes to hung waiting for mmap_lock to be released
  - From: Jinjiang Tu

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