linux-kernel - Re: BUG: using __this_cpu_read() in preemptible code in ip6_finish

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Date:   Tue, 02 Apr 2019 18:12:01 -0700
From:   syzbot <syzbot+51471b4aae195285a4a3@...kaller.appspotmail.com>
To:     alexander.h.duyck@...el.com, amritha.nambiar@...el.com,
        ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net,
        davem@...emloft.net, ecree@...arflare.com, fw@...len.de,
        idosch@...lanox.com, jiri@...lanox.com, kafai@...com,
        kuznet@....inr.ac.ru, linux-kernel@...r.kernel.org,
        lirongqing@...du.com, netdev@...r.kernel.org, petrm@...lanox.com,
        sd@...asysnail.net, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, yhs@...com,
        yoshfuji@...ux-ipv6.org
Subject: Re: BUG: using __this_cpu_read() in preemptible code in ip6_finish_output

syzbot has bisected this bug to:

commit 97cdcf37b57e3f204be3000b9eab9686f38b4356
Author: Florian Westphal <fw@...len.de>
Date:   Mon Apr 1 14:42:13 2019 +0000

     net: place xmit recursion in softnet data

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11c04b0f200000
start commit:   e1427237 macsec: add noinline tag to avoid a frame size wa..
git tree:       net-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=13c04b0f200000
console output: https://syzkaller.appspot.com/x/log.txt?x=15c04b0f200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8e9bc94c16d346a6
dashboard link: https://syzkaller.appspot.com/bug?extid=51471b4aae195285a4a3
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=156ffb07200000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14412673200000

Reported-by: syzbot+51471b4aae195285a4a3@...kaller.appspotmail.com
Fixes: 97cdcf37b57e ("net: place xmit recursion in softnet data")

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