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Date:   Fri, 21 Jul 2023 18:14:04 +1000 (AEST)
From:   Finn Thain <fthain@linux-m68k.org>
To:     Matthew Wilcox <willy@infradead.org>
cc:     Dave Chinner <david@fromorbit.com>,
        Jeff Layton <jlayton@kernel.org>,
        John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
        Dmitry Vyukov <dvyukov@google.com>,
        Viacheslav Dubeyko <slava@dubeyko.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        syzbot <syzbot+7bb7cd3595533513a9e7@syzkaller.appspotmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        christian.brauner@ubuntu.com,
        Damien Le Moal <damien.lemoal@opensource.wdc.com>,
        Linux FS Devel <linux-fsdevel@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        syzkaller-bugs@googlegroups.com,
        ZhangPeng <zhangpeng362@huawei.com>,
        linux-m68k@lists.linux-m68k.org,
        debian-ports <debian-ports@lists.debian.org>
Subject: Re: [syzbot] [hfs?] WARNING in hfs_write_inode
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On Fri, 21 Jul 2023, Matthew Wilcox wrote:

> 
> You've misunderstood.  Google have decided to subject the entire kernel 
> (including obsolete unmaintained filesystems) to stress tests that it's 
> never had before.  IOW these bugs have been there since the code was 
> merged.  There's nothing to back out.  There's no API change to blame. 
> It's always been buggy and it's never mattered before.
> 

I'm not blaming the unstable API for the bugs, I'm blaming it for the 
workload. A stable API (like a userspace API) decreases the likelihood 
that overloaded maintainers have to orphan a filesystem implementation.