linux-kernel - Re: [syzbot] [hfs?] WARNING in hfs_write

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Date:   Fri, 21 Jul 2023 18:14:04 +1000 (AEST)
From:   Finn Thain <fthain@...ux-m68k.org>
To:     Matthew Wilcox <willy@...radead.org>
cc:     Dave Chinner <david@...morbit.com>,
        Jeff Layton <jlayton@...nel.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Viacheslav Dubeyko <slava@...eyko.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        syzbot <syzbot+7bb7cd3595533513a9e7@...kaller.appspotmail.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        christian.brauner@...ntu.com,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com,
        ZhangPeng <zhangpeng362@...wei.com>,
        linux-m68k@...ts.linux-m68k.org,
        debian-ports <debian-ports@...ts.debian.org>
Subject: Re: [syzbot] [hfs?] WARNING in hfs_write_inode

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.