linux-kernel - Re: [syzbot] WARNING in cow_file_range

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Date:   Wed, 26 Oct 2022 10:14:26 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Johannes Thumshirn <Johannes.Thumshirn@....com>
Cc:     syzbot <syzbot+858534c396b0cdd291d2@...kaller.appspotmail.com>,
        "clm@...com" <clm@...com>, "dsterba@...e.com" <dsterba@...e.com>,
        "josef@...icpanda.com" <josef@...icpanda.com>,
        "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "osandov@...com" <osandov@...com>,
        "sweettea-kernel@...miny.me" <sweettea-kernel@...miny.me>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] WARNING in cow_file_range_inline

On Wed, Oct 26, 2022 at 07:30:02AM +0000, Johannes Thumshirn wrote:
> On 26.10.22 00:19, syzbot wrote:

> Not sure how applicable this is. The reproducer configures failslab to
> fail every 16th call and then complains about -ENOMEM ¯\_(ツ)_/¯

This still has some value I think, though we can't do much when an
ENOMEM is hit, at least from this report I see the way it's reported
back to user can be improved.

For EIO and EUCLEAN we don't dump the full stack trace because such
errors can happen during testing a lot, we may add ENOMEM as well. The
stack is supposed to be noisy for errors we want to know about, eg.
ENOSPC during transaction commit that would point to a bug in the
reservations.