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References: <000000000000e57c2b05e1c03426@google.com> <YrBJxrbq8Yvrpshj@linutronix.de>
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From:   Aleksandr Nogikh <nogikh@google.com>
Date:   Mon, 20 Jun 2022 13:24:20 +0200
Message-ID: <CANp29Y54ygc45-RX+HAXExLsOQgKqbrJ_7CDt6-kRsUwFdNp_Q@mail.gmail.com>
Subject: Re: [syzbot] BUG: sleeping function called from invalid context in __vmalloc_node_range
To:     Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc:     syzbot <syzbot+b577bc624afda52c78de@syzkaller.appspotmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andrii Nakryiko <andrii@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>, bpf <bpf@vger.kernel.org>,
        brauner@kernel.org, Daniel Borkmann <daniel@iogearbox.net>,
        david@redhat.com, ebiederm@xmission.com,
        John Fastabend <john.fastabend@gmail.com>,
        Martin KaFai Lau <kafai@fb.com>,
        KP Singh <kpsingh@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        netdev <netdev@vger.kernel.org>,
        Song Liu <songliubraving@fb.com>,
        "'Aleksandr Nogikh' via syzkaller-bugs" 
        <syzkaller-bugs@googlegroups.com>, tglx@linutronix.de,
        Yonghong Song <yhs@fb.com>, linux-mm@kvack.org,
        Christoph Hellwig <hch@infradead.org>,
        Dmitry Vyukov <dvyukov@google.com>
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Hi Sebastian,

Syzbot has noted the new fixing commit -- "mm/page_alloc: protect PCP
lists with a spinlock", but it's not really happy with two commands in
one email.

Let's try it one more time in this separate email:

#syz dup: BUG: sleeping function called from invalid context in relay_open_=
buf

--
Best Regards,
Aleksandr

On Mon, Jun 20, 2022 at 12:19 PM Sebastian Andrzej Siewior
<bigeasy@linutronix.de> wrote:
>
> #syz fix: mm/page_alloc: protect PCP lists with a spinlock
> #syz dup: BUG: sleeping function called from invalid context in relay_ope=
n_buf
>
> The version of the patch above in next-20220614 is buggy leading to the
> report below. The version in next-20220620 is fine. Not sure how to tell
> syz bot this=E2=80=A6
>
> On 2022-06-18 15:15:20 [-0700], syzbot wrote:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    35d872b9ea5b Add linux-next specific files for 20220614
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=3D155b0d10080=
000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=3Dd7bf2236c6b=
b2403
> > dashboard link: https://syzkaller.appspot.com/bug?extid=3Db577bc624afda=
52c78de
> > compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binu=
tils for Debian) 2.35.2
> >
> > Unfortunately, I don't have any reproducer for this issue yet.
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the co=
mmit:
> > Reported-by: syzbot+b577bc624afda52c78de@syzkaller.appspotmail.com
> >
> > BUG: sleeping function called from invalid context at mm/vmalloc.c:2980
> =E2=80=A6
> > Preemption disabled at:
> > [<ffffffff81bc76f5>] rmqueue_pcplist mm/page_alloc.c:3813 [inline]
> > [<ffffffff81bc76f5>] rmqueue mm/page_alloc.c:3858 [inline]
> > [<ffffffff81bc76f5>] get_page_from_freelist+0x455/0x3a20 mm/page_alloc.=
c:4293
>
> Sebastian
>
> --
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