Re: [axboe-block:for-6.5/block] [block] 1ccf164ec8: WARNING:at_mm/gup.c:#try_get_folio

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To: David Hildenbrand <david@xxxxxxxxxx>
Subject: Re: [axboe-block:for-6.5/block] [block] 1ccf164ec8: WARNING:at_mm/gup.c:#try_get_folio
From: David Howells <dhowells@xxxxxxxxxx>
Date: Mon, 12 Jun 2023 16:11:13 +0100
Cc: dhowells@xxxxxxxxxx, kernel test robot <oliver.sang@xxxxxxxxx>, oe-lkp@xxxxxxxxxxxxxxx, lkp@xxxxxxxxx, Jens Axboe <axboe@xxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Lorenzo Stoakes <lstoakes@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxxxx>, Logan Gunthorpe <logang@xxxxxxxxxxxx>, Hillf Danton <hdanton@xxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx
In-reply-to: <080538f2-defc-2000-c9f2-fb520448c93c@redhat.com>
Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903

David Hildenbrand <david@xxxxxxxxxx> wrote:

> The first DIO messes up the refcount (double-unpin?) such that the second one
> detects the refcount underflow when trying to pin the page again?

It seems to be something to do with the zero page:-/

David

References:
- Re: [axboe-block:for-6.5/block] [block] 1ccf164ec8: WARNING:at_mm/gup.c:#try_get_folio
  - From: David Hildenbrand
- [axboe-block:for-6.5/block] [block] 1ccf164ec8: WARNING:at_mm/gup.c:#try_get_folio
  - From: kernel test robot
- Re: [axboe-block:for-6.5/block] [block] 1ccf164ec8: WARNING:at_mm/gup.c:#try_get_folio
  - From: David Howells

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