linux-kernel - Re: [syzbot] KASAN: use-after-free Read in copy_page_from_iter

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Message-ID: <20220616063510.GA5608@lst.de>
Date:   Thu, 16 Jun 2022 08:35:10 +0200
From:   Christoph Hellwig <hch@....de>
To:     Qu Wenruo <quwenruo.btrfs@....com>
Cc:     Christoph Hellwig <hch@....de>, dsterba@...e.cz,
        syzbot <syzbot+d2dd123304b4ae59f1bd@...kaller.appspotmail.com>,
        akpm@...ux-foundation.org, clm@...com, dsterba@...e.com,
        josef@...icpanda.com, linux-btrfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com,
        willy@...radead.org
Subject: Re: [syzbot] KASAN: use-after-free Read in
 copy_page_from_iter_atomic (2)

On Thu, Jun 16, 2022 at 05:27:04AM +0800, Qu Wenruo wrote:
>> And how do I find out the logic address of the tree root?
>
> For tree root, "btrfs ins dump-super <dev> | grep '^root\s'.
>
> For other tree blocks, "btrfs ins dump-tree <dev>" then with other other
> keywords to grab.

Thanks a lot !