linux-kernel - Re: bpf build error (2)

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Message-ID: <CACT4Y+YnLC93dzGE51KQmqwgOgcULtnE1fS_ruJns_Ar1uqYhg@mail.gmail.com>
Date:   Thu, 28 Nov 2019 09:37:20 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+c89a581922d5a98fccb8@...kaller.appspotmail.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: bpf build error (2)

On Thu, Nov 28, 2019 at 9:35 AM syzbot
<syzbot+c89a581922d5a98fccb8@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    7c3977d1 libbpf: Fix sym->st_value print on 32-bit arches
> git tree:       bpf
> console output: https://syzkaller.appspot.com/x/log.txt?x=108ab832e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7a7e892e3a014d76
> dashboard link: https://syzkaller.appspot.com/bug?extid=c89a581922d5a98fccb8
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+c89a581922d5a98fccb8@...kaller.appspotmail.com
>
> failed to run ["make" "bzImage" "CC=/syzkaller/gcc/bin/gcc" "-j64"]: exit
> status 2
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

syzbot distro does not provide pahole 1.13, so I followed the
suggestion and disabled CONFIG_DEBUG_INFO_BTF:
https://github.com/google/syzkaller/commit/861a5980df642d6b9fb59fda98d5a75a019f5f34
#syz invalid