netdev - Re: general protection fault in free_verifier

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Message-ID: <CAADnVQ+jS2C=TxPvyKJmoj7HENCZVr3O_N1tHQ4uTewPDUu0_A@mail.gmail.com>
Date:   Tue, 21 Jan 2020 11:16:33 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     syzbot <syzbot+b296579ba5015704d9fa@...kaller.appspotmail.com>
Cc:     Andrii Nakryiko <andriin@...com>,
        Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        LKML <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Song Liu <songliubraving@...com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Yonghong Song <yhs@...com>
Subject: Re: general protection fault in free_verifier_state (3)

On Tue, Jan 21, 2020 at 11:05 AM syzbot
<syzbot+b296579ba5015704d9fa@...kaller.appspotmail.com> wrote:
>
> syzbot has found a reproducer for the following crash on:
>
> HEAD commit:    2e3a94aa bpf: Fix memory leaks in generic update/delete ba..
> git tree:       bpf-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=15aefc6ee00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a736c99e9fe5a676
> dashboard link: https://syzkaller.appspot.com/bug?extid=b296579ba5015704d9fa
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10a4280de00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1411544ee00000

Since it's in the verifier I'm guessing it's related to some of my
earlier patches.
I'll try to take a look soon.