linux-kernel - Re: [syzbot] WARNING in mroute_clean

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Message-ID: <9bb39c37-0fc9-f4a7-dd4b-897f0a8fae18@gmail.com>
Date:   Thu, 10 Feb 2022 08:39:40 -0800
From:   Eric Dumazet <erdnetdev@...il.com>
To:     syzbot <syzbot+a7c030a05218db921de5@...kaller.appspotmail.com>,
        davem@...emloft.net, dsahern@...nel.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, yoshfuji@...ux-ipv6.org
Subject: Re: [syzbot] WARNING in mroute_clean_tables


On 2/10/22 06:05, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit:    e5313968c41b Merge branch 'Split bpf_sk_lookup remote_port..
> git tree:       bpf-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=141c859a700000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c40b67275bfe2a58
> dashboard link: https://syzkaller.appspot.com/bug?extid=a7c030a05218db921de5
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=130486f8700000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16d9f758700000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+a7c030a05218db921de5@...kaller.appspotmail.com


#syz fix: ipmr,ip6mr: acquire RTNL before calling ip[6]mr_free_table() 
on failure path