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References: <0000000000004e1dfa05f4a48e6b@google.com> <20230215015231.3646-1-hdanton@sina.com>
In-Reply-To: <20230215015231.3646-1-hdanton@sina.com>
From:   Yu Zhao <yuzhao@google.com>
Date:   Tue, 14 Feb 2023 23:02:02 -0700
Message-ID: <CAOUHufYzJoh=Pvican+c8E5-5vyv_TuVaa27nDKXw3CLR=ca5A@mail.gmail.com>
Subject: Re: [syzbot] [nilfs2?] INFO: task hung in nilfs_segctor_thread
To:     Hillf Danton <hdanton@sina.com>, Dmitry Vyukov <dvyukov@google.com>
Cc:     linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org
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On Tue, Feb 14, 2023 at 6:52 PM Hillf Danton <hdanton@sina.com> wrote:
>
> On Tue, 14 Feb 2023 00:14:42 -0800
> > syzbot has found a reproducer for the following issue on:
> >
> > HEAD commit:    f6feea56f66d Merge tag 'mm-hotfixes-stable-2023-02-13-13-5..
> > git tree:       upstream
> > console+strace: https://syzkaller.appspot.com/x/log.txt?x=165ee62b480000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=42ba4da8e1e6af9f
> > dashboard link: https://syzkaller.appspot.com/bug?extid=f0c4082ce5ebebdac63b
> > compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14ba7207480000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15fd30d0c80000
> >
> > Downloadable assets:
> > disk image: https://storage.googleapis.com/syzbot-assets/1ae0143f08d5/disk-f6feea56.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/18b8a23fa0cb/vmlinux-f6feea56.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/d915f4c5c8c0/bzImage-f6feea56.xz
> > mounted in repro: https://storage.googleapis.com/syzbot-assets/1acd3b288433/mount_0.gz
> >

> >  folio_mark_accessed+0x51c/0xf00 mm/swap.c:515
>
> Syzbot was launched without MGLRU enabled [1].
> Dmitry could you turn it on by default?

Thanks for the heads up!

(I should have followed up with Dmitry earlier... doing it now.)