From: Peter Xu <peterx@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Kefeng Wang <wangkefeng.wang@huawei.com>,
Mike Rapoport <rppt@kernel.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Axel Rasmussen <axelrasmussen@google.com>,
Pavel Emelyanov <xemul@virtuozzo.com>,
Jinjiang Tu <tujinjiang@huawei.com>,
Dimitris Siakavaras <jimsiak@cslab.ece.ntua.gr>,
Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH] mm/userfaultfd: Fix release hang over concurrent GUP
Date: Wed, 12 Mar 2025 18:28:22 -0400 [thread overview]
Message-ID: <Z9IKhq3JDjfEEk4q@x1.local> (raw)
In-Reply-To: <20250312150411.f4a5b406600742a49b46d04e@linux-foundation.org>
On Wed, Mar 12, 2025 at 03:04:11PM -0700, Andrew Morton wrote:
> It would be good to have a Fixes: target but this bug seems to be so
> old that a bare cc:stable should be OK?
Yes I agree that should work for us, sorry I forgot to try attach that from
time to time..
AFAIU, such unwanted behavior (either GUP hangs, or if before commit
656710a60e36, the behavior could be a SIGBUS returned to GUP racing with
the userfaultfd_release()) should exist since the 1st day, but I didn't
verify the original commit.
Thanks,
--
Peter Xu
prev parent reply other threads:[~2025-03-12 22:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-12 14:51 Peter Xu
2025-03-12 22:04 ` Andrew Morton
2025-03-12 22:28 ` Peter Xu [this message]
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