linux-kernel - Re: WARNING in cbq

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Date:   Thu, 23 Jan 2020 10:14:41 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     syzbot <syzbot+63bdb6006961d8c917c6@...kaller.appspotmail.com>
Cc:     David Miller <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: WARNING in cbq_destroy

On Tue, Jan 21, 2020 at 10:57 PM syzbot
<syzbot+63bdb6006961d8c917c6@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    d96d875e Merge tag 'fixes_for_v5.5-rc8' of git://git.kerne..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=144f7601e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=83c00afca9cf5153
> dashboard link: https://syzkaller.appspot.com/bug?extid=63bdb6006961d8c917c6
> compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17a1a721e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11a91a95e00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+63bdb6006961d8c917c6@...kaller.appspotmail.com
>
> netlink: 96 bytes leftover after parsing attributes in process `syz-executor899'.
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 8828 at net/sched/sch_cbq.c:1437 cbq_destroy_class net/sched/sch_cbq.c:1437 [inline]
> WARNING: CPU: 1 PID: 8828 at net/sched/sch_cbq.c:1437 cbq_destroy+0x324/0x400 net/sched/sch_cbq.c:1471


Just FYI: I am still working on a fix, which is more complicated than I thought.

Thanks.