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Date:   Mon, 20 Jun 2022 12:19:50 +0200
From:   Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To:     syzbot <syzbot+b577bc624afda52c78de@syzkaller.appspotmail.com>
Cc:     akpm@linux-foundation.org, andrii@kernel.org, ast@kernel.org,
        bpf@vger.kernel.org, brauner@kernel.org, daniel@iogearbox.net,
        david@redhat.com, ebiederm@xmission.com, john.fastabend@gmail.com,
        kafai@fb.com, kpsingh@kernel.org, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org, songliubraving@fb.com,
        syzkaller-bugs@googlegroups.com, tglx@linutronix.de, yhs@fb.com,
        linux-mm@kvack.org, Christoph Hellwig <hch@infradead.org>,
        Dmitry Vyukov <dvyukov@google.com>
Subject: Re: [syzbot] BUG: sleeping function called from invalid context in
 __vmalloc_node_range
Message-ID: <YrBJxrbq8Yvrpshj@linutronix.de>
References: <000000000000e57c2b05e1c03426@google.com>
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#syz fix: mm/page_alloc: protect PCP lists with a spinlock
#syz dup: BUG: sleeping function called from invalid context in relay_open_=
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,
>=20
> syzbot found the following issue on:
>=20
> HEAD commit:    35d872b9ea5b Add linux-next specific files for 20220614
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=3D155b0d10080000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3Dd7bf2236c6bb2=
403
> dashboard link: https://syzkaller.appspot.com/bug?extid=3Db577bc624afda52=
c78de
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binuti=
ls for Debian) 2.35.2
>=20
> Unfortunately, I don't have any reproducer for this issue yet.
>=20
> IMPORTANT: if you fix the issue, please add the following tag to the comm=
it:
> Reported-by: syzbot+b577bc624afda52c78de@syzkaller.appspotmail.com
>=20
> 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