netdev - Re: [syzbot] BUG: sleeping function called from invalid context in __vmalloc_node

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Date:   Mon, 20 Jun 2022 13:24:20 +0200
From:   Aleksandr Nogikh <nogikh@...gle.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     syzbot <syzbot+b577bc624afda52c78de@...kaller.appspotmail.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>,
        brauner@...nel.org, Daniel Borkmann <daniel@...earbox.net>,
        david@...hat.com, ebiederm@...ssion.com,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        KP Singh <kpsingh@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Song Liu <songliubraving@...com>,
        "'Aleksandr Nogikh' via syzkaller-bugs" 
        <syzkaller-bugs@...glegroups.com>, tglx@...utronix.de,
        Yonghong Song <yhs@...com>, linux-mm@...ck.org,
        Christoph Hellwig <hch@...radead.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [syzbot] BUG: sleeping function called from invalid context in __vmalloc_node_range

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@...utronix.de> wrote:
>
> #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…
>
> 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=155b0d10080000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=d7bf2236c6bb2403
> > dashboard link: https://syzkaller.appspot.com/bug?extid=b577bc624afda52c78de
> > compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils 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 commit:
> > Reported-by: syzbot+b577bc624afda52c78de@...kaller.appspotmail.com
> >
> > BUG: sleeping function called from invalid context at mm/vmalloc.c:2980
> …
> > 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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