linux-kernel - Re: WARNING: suspicious RCU usage in ovs_flow_tbl

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Date:   Tue, 04 Aug 2020 12:10:07 -0700
From:   syzbot <syzbot+c0eb9e7cdde04e4eb4be@...kaller.appspotmail.com>
To:     davem@...emloft.net, dev@...nvswitch.org, echaudro@...hat.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com, pshelar@....org,
        syzkaller-bugs@...glegroups.com, xiangxia.m.yue@...il.com
Subject: Re: WARNING: suspicious RCU usage in ovs_flow_tbl_destroy

syzbot has bisected this issue to:

commit 9bf24f594c6acf676fb8c229f152c21bfb915ddb
Author: Eelco Chaudron <echaudro@...hat.com>
Date:   Fri Jul 31 12:21:34 2020 +0000

    net: openvswitch: make masks cache size configurable

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17461dea900000
start commit:   2f631133 net: Pass NULL to skb_network_protocol() when we ..
git tree:       net-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=14c61dea900000
console output: https://syzkaller.appspot.com/x/log.txt?x=10c61dea900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=91a13b78c7dc258d
dashboard link: https://syzkaller.appspot.com/bug?extid=c0eb9e7cdde04e4eb4be
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=172cd3d4900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11fbd342900000

Reported-by: syzbot+c0eb9e7cdde04e4eb4be@...kaller.appspotmail.com
Fixes: 9bf24f594c6a ("net: openvswitch: make masks cache size configurable")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection