linux-kernel - Re: general protection fault in open_fs

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Date:   Thu, 7 Jun 2018 19:03:23 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Anand Jain <anand.jain@...cle.com>
Cc:     syzbot <syzbot+909a5177749d7990ffa4@...kaller.appspotmail.com>,
        clm@...com, dsterba@...e.com, Josef Bacik <jbacik@...com>,
        linux-btrfs@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: general protection fault in open_fs_devices

On Wed, Jun 6, 2018 at 6:28 PM, Anand Jain <anand.jain@...cle.com> wrote:
>
>
> On 06/06/2018 09:17 PM, syzbot wrote:
>
>
>
>  Which means there was some other thread which freed our %fs_devices.
>  As this thread is still in open_ctree() so the contending thread can't
>  be the ioctl(). So btrfs_free_stale_devices() is the only thread which
>  can free our %fs_devices in this case.
>
>  This is fixed in [1] in the mailing list.
>
>  [1]
>    [PATCH 3/3] btrfs: fix race between mkfs and mount


Let's tell about this syzbot:

#syz fix: btrfs: fix race between mkfs and mount