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Message-ID: <e2d88c95-f848-2236-64c5-54331876d2bf@redhat.com>
Date: Wed, 14 Jun 2023 09:28:36 +0200
From: David Hildenbrand <david@...hat.com>
To: David Howells <dhowells@...hat.com>, Jens Axboe <axboe@...nel.dk>,
kernel test robot <oliver.sang@...el.com>
Cc: Christoph Hellwig <hch@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Al Viro <viro@...iv.linux.org.uk>,
Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
Jeff Layton <jlayton@...nel.org>,
Jason Gunthorpe <jgg@...dia.com>,
Logan Gunthorpe <logang@...tatee.com>,
Hillf Danton <hdanton@...a.com>,
Christian Brauner <brauner@...nel.org>,
Lorenzo Stoakes <lstoakes@...il.com>,
linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
linux-mm@...ck.org, oe-lkp@...ts.linux.dev, lkp@...el.com,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: Fix dio_cleanup() to advance the head index
On 13.06.23 23:54, David Howells wrote:
>
> Fix dio_bio_cleanup() to advance the head index into the list of pages past
> the pages it has released, as __blockdev_direct_IO() will call it twice if
> do_direct_IO() fails.
>
> The issue was causing:
>
> WARNING: CPU: 6 PID: 2220 at mm/gup.c:76 try_get_folio
>
> This can be triggered by setting up a clean pair of UDF filesystems on
> loopback devices and running the generic/451 xfstest with them as the
> scratch and test partitions. Something like the following:
>
> fallocate /mnt2/udf_scratch -l 1G
> fallocate /mnt2/udf_test -l 1G
> mknod /dev/lo0 b 7 0
> mknod /dev/lo1 b 7 1
> losetup lo0 /mnt2/udf_scratch
> losetup lo1 /mnt2/udf_test
> mkfs -t udf /dev/lo0
> mkfs -t udf /dev/lo1
> cd xfstests
> ./check generic/451
>
> with xfstests configured by putting the following into local.config:
>
> export FSTYP=udf
> export DISABLE_UDF_TEST=1
> export TEST_DEV=/dev/lo1
> export TEST_DIR=/xfstest.test
> export SCRATCH_DEV=/dev/lo0
> export SCRATCH_MNT=/xfstest.scratch
>
> Fixes: 1ccf164ec866 ("block: Use iov_iter_extract_pages() and page pinning in direct-io.c")
> Reported-by: kernel test robot <oliver.sang@...el.com>
> Closes: https://lore.kernel.org/oe-lkp/202306120931.a9606b88-oliver.sang@intel.com
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Christoph Hellwig <hch@...radead.org>
> cc: David Hildenbrand <david@...hat.com>
> cc: Andrew Morton <akpm@...ux-foundation.org>
> cc: Jens Axboe <axboe@...nel.dk>
> cc: Al Viro <viro@...iv.linux.org.uk>
> cc: Matthew Wilcox <willy@...radead.org>
> cc: Jan Kara <jack@...e.cz>
> cc: Jeff Layton <jlayton@...nel.org>
> cc: Jason Gunthorpe <jgg@...dia.com>
> cc: Logan Gunthorpe <logang@...tatee.com>
> cc: Hillf Danton <hdanton@...a.com>
> cc: Christian Brauner <brauner@...nel.org>
> cc: Linus Torvalds <torvalds@...ux-foundation.org>
> cc: linux-fsdevel@...r.kernel.org
> cc: linux-block@...r.kernel.org
> cc: linux-kernel@...r.kernel.org
> cc: linux-mm@...ck.org
> ---
> fs/direct-io.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/fs/direct-io.c b/fs/direct-io.c
> index 0643f1bb4b59..2ceb378b93c0 100644
> --- a/fs/direct-io.c
> +++ b/fs/direct-io.c
> @@ -459,6 +459,7 @@ static inline void dio_cleanup(struct dio *dio, struct dio_submit *sdio)
> if (dio->is_pinned)
> unpin_user_pages(dio->pages + sdio->head,
> sdio->tail - sdio->head);
> + sdio->head = sdio->tail;
> }
>
> /*
>
Reviewed-by: David Hildenbrand <david@...hat.com>
--
Cheers,
David / dhildenb
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