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From: Oleg Nesterov <oleg@redhat.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>,
	linux-mm <linux-mm@kvack.org>, Peter Xu <peterx@redhat.com>,
	Mike Rapoport <rppt@linux.ibm.com>, Jann Horn <jannh@google.com>,
	Jason Gunthorpe <jgg@mellanox.com>,
	Michal Hocko <mhocko@suse.com>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [BUG] kernel BUG at fs/userfaultfd.c:385 after 04f5866e41fb
Date: Fri, 30 Aug 2019 18:49:22 +0200	[thread overview]
Message-ID: <20190830164921.GE2634@redhat.com> (raw)
In-Reply-To: <20190829120509.GA14112@redhat.com>

On 08/29, Andrea Arcangeli wrote:
>
> It's true you could have two uffd registered in the same mm
> and you could call the UFFDIO_COPY ioctl on anyone of the two and it
> wouldn't make any difference as long as they both are registered in
> the same mm.

...

> There would be nothing wrong to make it more strict, but it's not
> strictly needed.

Thanks Andrea, this answers my question.

Oleg.



      reply	other threads:[~2019-08-30 16:49 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-13  9:08 [BUG] kernel BUG at fs/userfaultfd.c:385 after 04f5866e41fb Kefeng Wang
2019-08-14 13:53 ` Michal Hocko
2019-08-14 14:45   ` Kefeng Wang
2019-08-14 15:10     ` Oleg Nesterov
2019-08-14 15:41       ` Oleg Nesterov
2019-08-15  2:21         ` Kefeng Wang
2019-08-15  9:54           ` Oleg Nesterov
2019-08-16 10:37             ` Kefeng Wang
2019-08-19 12:48               ` Oleg Nesterov
2019-08-19 16:05         ` Andrea Arcangeli
2019-08-20 15:59           ` Oleg Nesterov
2019-08-20 16:15             ` Andrea Arcangeli
     [not found]           ` <73d7b5b1-a88c-5fca-ba16-be214c2524a4@I-love.SAKURA.ne.jp>
2019-08-20 16:09             ` Oleg Nesterov
2019-08-20 16:02 ` [PATCH] userfaultfd_release: always remove uffd flags and clear vm_userfaultfd_ctx Oleg Nesterov
2019-08-20 16:05   ` Andrea Arcangeli
2019-08-21  0:53   ` Kefeng Wang
2019-08-27 16:33 ` [BUG] kernel BUG at fs/userfaultfd.c:385 after 04f5866e41fb Oleg Nesterov
2019-08-27 17:14   ` Andrea Arcangeli
2019-08-28 14:25     ` Oleg Nesterov
2019-08-29 12:05       ` Andrea Arcangeli
2019-08-30 16:49         ` Oleg Nesterov [this message]

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