Re: UBSAN: shift-out-of-bounds in get_init_ra_size()

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To: Johannes Thumshirn <Johannes.Thumshirn@xxxxxxx>
Subject: Re: UBSAN: shift-out-of-bounds in get_init_ra_size()
From: David Sterba <dsterba@xxxxxxx>
Date: Wed, 21 Oct 2020 13:14:28 +0200
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>, "linux-btrfs@xxxxxxxxxxxxxxx" <linux-btrfs@xxxxxxxxxxxxxxx>, "linux-fsdevel@xxxxxxxxxxxxxxx" <linux-fsdevel@xxxxxxxxxxxxxxx>
In-reply-to: <SN4PR0401MB3598C9C5B4D7ED74E79F28A09B1C0@SN4PR0401MB3598.namprd04.prod.outlook.com>
Mail-followup-to: dsterba@xxxxxxx, Johannes Thumshirn <Johannes.Thumshirn@xxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, "linux-btrfs@xxxxxxxxxxxxxxx" <linux-btrfs@xxxxxxxxxxxxxxx>, "linux-fsdevel@xxxxxxxxxxxxxxx" <linux-fsdevel@xxxxxxxxxxxxxxx>
Reply-to: dsterba@xxxxxxx
User-agent: Mutt/1.5.23.1-rc1 (2014-03-12)

On Wed, Oct 21, 2020 at 10:57:02AM +0000, Johannes Thumshirn wrote:
> Hi Willy,
> 
> I've encountered a USBSN [1] splat when running xfstests (hit it with generic/091)
> on the latest iteration of our btrfs-zoned patchset.

This first showed up with btrfs' dio-iomap switch
(https://github.com/btrfs/fstests/issues/5) so it's not related to the
zoned patches.

Follow-Ups:
- Re: UBSAN: shift-out-of-bounds in get_init_ra_size()
  - From: Johannes Thumshirn

References:
- UBSAN: shift-out-of-bounds in get_init_ra_size()
  - From: Johannes Thumshirn

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