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From: Nikolaus Rath <Nikolaus@rath.org>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: fuse-devel <fuse-devel@lists.sourceforge.net>,
	Miklos Szeredi <mszeredi@redhat.com>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [fuse-devel] fuse: trying to steal weird page
Date: Mon, 07 Jan 2019 21:05:16 +0000	[thread overview]
Message-ID: <87ef9omb5f.fsf@vostro.rath.org> (raw)
In-Reply-To: <CAJfpegtQic0v+9G7ODXEzgUPAGOz+3Ay28uxqbafZGMJdqL-zQ@mail.gmail.com> (Miklos Szeredi's message of "Mon, 7 Jan 2019 09:28:15 +0100")

On Jan 07 2019, Miklos Szeredi <miklos@szeredi.hu> wrote:
> On Wed, Dec 26, 2018 at 10:44 PM Nikolaus Rath <Nikolaus@rath.org> wrote:
>>
>> Hi,
>>
>> I am seeing relatively regular occurences of
>>
>> $ sudo dmesg | tail
>> [21929.138815] fuse: trying to steal weird page
>> [21929.138821] page=00000000a7dd2617 index=64 flags=17fffc0000000ad,
>> count=1, mapcount=0, mapping= (null)
>> [21930.647338] fuse: trying to steal weird page
>> [21930.647345] page=00000000a07f32af index=2848
>> flags=17fffc0000000ad, count=1, mapcount=0, mapping= (null)
>> [21932.338873] fuse: trying to steal weird page
>> [21932.338879] page=0000000067e3a012 index=64 flags=17fffc0000000ad,
>> count=1, mapcount=0, mapping= (null)
>> [21933.930703] fuse: trying to steal weird page
>> [21933.930710] page=00000000046feb25 index=845
>> flags=17fffc0000000ad, count=1, mapcount=0, mapping= (null)
>> [21936.163174] fuse: trying to steal weird page
>> [21936.163180] page=00000000fb80fe27 index=0 flags=17fffc0000000ad,
>> count=1, mapcount=0, mapping= (null)
>
> The page has the PG_dity and PG_waiters flags set which are
> incompatible with stealing.  page_cache_pipe_buf_steal() does
> apparently filter out dirty ones, so it's not a regular file that we
> are trying to streal the page from.  So the question is: what is the
> source of the splice()?
 
Hmm. I think it has to be a regular file. But as I mentioned in my other
email, I did have a race condition where fd's were closed
incorrectly. Is it possible that this also triggered the above,
i.e. that the fd was closed sometime during splice?


Best,
-Nikolaus

-- 
GPG Fingerprint: ED31 791B 2C5C 1613 AF38 8B8A D113 FCAC 3C4E 599F

             »Time flies like an arrow, fruit flies like a Banana.«

  reply	other threads:[~2019-01-07 21:05 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-26 21:43 Nikolaus Rath
2019-01-07  8:28 ` [fuse-devel] " Miklos Szeredi
2019-01-07 21:05   ` Nikolaus Rath [this message]
2019-01-08  8:27     ` Miklos Szeredi
2019-01-08 10:35       ` Nikolaus Rath
2019-01-09  8:07         ` Miklos Szeredi
     [not found]           ` <CAJfpegtiXDgSBWN8MRubpAdJFxy95X21nO_yycCZhpvKLVePRA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-01-11 15:39             ` Nikolaus Rath
2019-01-11 15:39               ` [fuse-devel] " Nikolaus Rath
2019-02-10 22:05               ` Nikolaus Rath
2019-02-12 14:57                 ` Miklos Szeredi
2019-02-12 21:28                   ` Nikolaus Rath
2019-02-25 21:41                     ` Nikolaus Rath
2019-02-26 12:57                       ` Miklos Szeredi
2019-02-26 13:30                         ` Miklos Szeredi
2020-05-02 19:09 Nikolaus Rath
2020-05-02 19:52 ` Nikolaus Rath
2020-05-03  3:26   ` Matthew Wilcox
2020-05-03  8:43     ` [fuse-devel] " Nikolaus Rath
2020-05-03 10:27       ` Matthew Wilcox
2020-05-03 18:28         ` Gabriel Krisman Bertazi
2020-05-03 20:06           ` Matthew Wilcox
2020-05-03 20:25           ` Nikolaus Rath
2020-05-06 13:57             ` Vlastimil Babka
2020-05-03 21:34         ` Hugh Dickins
2020-05-18 12:45         ` Miklos Szeredi
2020-05-18 14:48           ` Matthew Wilcox
2020-05-18 14:58             ` Miklos Szeredi
2020-05-18 15:26               ` Matthew Wilcox

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