linux-ext4 - Re: kernel BUG at fs/ext4/inode.c:LINE!

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Message-ID: <CAHk-=wjiVtroOvNkuptH0GofVUvOMw4wmmaXdnGPPT8y8+MbyQ@mail.gmail.com>
Date:   Tue, 24 Nov 2020 15:24:56 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        syzbot <syzbot+3622cea378100f45d59f@...kaller.appspotmail.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        "Theodore Ts'o" <tytso@....edu>, Linux-MM <linux-mm@...ck.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Nicholas Piggin <npiggin@...il.com>,
        Alex Shi <alex.shi@...ux.alibaba.com>, Qian Cai <cai@....pw>,
        Christoph Hellwig <hch@...radead.org>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        William Kucharski <william.kucharski@...cle.com>,
        Jens Axboe <axboe@...nel.dk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>
Subject: Re: kernel BUG at fs/ext4/inode.c:LINE!

On Tue, Nov 24, 2020 at 1:47 PM Hugh Dickins <hughd@...gle.com> wrote:
>
> I think the unreferenced struct page asks for trouble.

I do agree.

I've applied your second patch (the smaller one that just takes a ref
around the critical section). If somebody comes up with some great
alternative, we can always revisit this.

            Linus