netdev - Re: WARNING in mark_chain

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Date:   Tue, 9 Jul 2019 11:55:17 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     syzbot <syzbot+f21251a7468cd46efc60@...kaller.appspotmail.com>
Cc:     aaron.f.brown@...el.com, Alexei Starovoitov <ast@...nel.org>,
        bpf <bpf@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>, hawk@...nel.org,
        intel-wired-lan@...ts.osuosl.org,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        jeffrey.t.kirsher@...el.com,
        john fastabend <john.fastabend@...il.com>,
        Martin Lau <kafai@...com>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, sasha.neftin@...el.com,
        Song Liu <songliubraving@...com>,
        syzkaller-bugs@...glegroups.com, xdp-newbies@...r.kernel.org,
        Yonghong Song <yhs@...com>
Subject: Re: WARNING in mark_chain_precision

Original reproducer is almost identical to the one that is fixed by
https://patchwork.ozlabs.org/patch/1129479/.

bpf_prog_free_deferred bug that's undeterministically exposed after
this fix seems to be the cause of a bunch of other bug reports and is
not related to verifier precision tracking.

#syz dup: WARNING in __mark_chain_precision