linux-kernel - Re: net build error

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Date:   Mon, 31 Dec 2018 11:44:43 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+a72ba31e3224309179d4@...kaller.appspotmail.com>,
        netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: net build error

On Sun, Sep 23, 2018 at 10:14 AM Dmitry Vyukov <dvyukov@...gle.com> wrote:
>
> On Sun, Sep 23, 2018 at 9:42 AM, syzbot
> <syzbot+a72ba31e3224309179d4@...kaller.appspotmail.com> wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    474ff2600889 net-ethtool: ETHTOOL_GUFO did not and should ..
> > git tree:       net
> > console output: https://syzkaller.appspot.com/x/log.txt?x=164c4059400000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=5fa12be50bca08d8
> > dashboard link: https://syzkaller.appspot.com/bug?extid=a72ba31e3224309179d4
> > compiler:       gcc (GCC) 8.0.1 20180413 (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+a72ba31e3224309179d4@...kaller.appspotmail.com
>
> +netdev
>
> The root cause:

Turns out +David fixed this in September with:

#syz fix: rds: Fix build regression.

> net/rds/ib.o:(.data..percpu..shared_aligned+0x0): multiple definition
> of `rds_ib_stats'
> net/rds/rdma_transport.o:(.data..percpu..shared_aligned+0x0): first defined here
> net/rds/ib_cm.o:(.data..percpu..shared_aligned+0x0): multiple
> definition of `rds_ib_stats'
> net/rds/rdma_transport.o:/syzkaller/managers/upstream-net-this-kasan-gce/kernel/net/rds/rdma_transport.c:284:
> first defined here
> net/rds/ib_recv.o:(.data..percpu..shared_aligned+0x0): multiple
> definition of `rds_ib_stats'
> net/rds/rdma_transport.o:/syzkaller/managers/upstream-net-this-kasan-gce/kernel/net/rds/rdma_transport.c:284:
> first defined here
> net/rds/ib_ring.o:(.data..percpu..shared_aligned+0x0): multiple
> definition of `rds_ib_stats'
> net/rds/rdma_transport.o:/syzkaller/managers/upstream-net-this-kasan-gce/kernel/net/rds/rdma_transport.c:284:
> first defined here
> net/rds/ib_send.o:(.data..percpu..shared_aligned+0x0): multiple
> definition of `rds_ib_stats'
> net/rds/rdma_transport.o:/syzkaller/managers/upstream-net-this-kasan-gce/kernel/net/rds/rdma_transport.c:284:
> first defined here
> net/rds/ib_stats.o:(.data..percpu..shared_aligned+0x0): multiple
> definition of `rds_ib_stats'
> net/rds/rdma_transport.o:/syzkaller/managers/upstream-net-this-kasan-gce/kernel/net/rds/rdma_transport.c:284:
> first defined here
> net/rds/ib_sysctl.o:(.data..percpu..shared_aligned+0x0): multiple
> definition of `rds_ib_stats'
> net/rds/rdma_transport.o:/syzkaller/managers/upstream-net-this-kasan-gce/kernel/net/rds/rdma_transport.c:284:
> first defined here
> net/rds/ib_rdma.o:(.data..percpu..shared_aligned+0x0): multiple
> definition of `rds_ib_stats'
> net/rds/rdma_transport.o:/syzkaller/managers/upstream-net-this-kasan-gce/kernel/net/rds/rdma_transport.c:284:
> first defined here
> net/rds/ib_fmr.o:(.data..percpu..shared_aligned+0x0): multiple
> definition of `rds_ib_stats'
> net/rds/rdma_transport.o:/syzkaller/managers/upstream-net-this-kasan-gce/kernel/net/rds/rdma_transport.c:284:
> first defined here
> net/rds/ib_frmr.o:(.data..percpu..shared_aligned+0x0): multiple
> definition of `rds_ib_stats'
> net/rds/rdma_transport.o:/syzkaller/managers/upstream-net-this-kasan-gce/kernel/net/rds/rdma_transport.c:284:
> first defined here
> Makefile:1030: recipe for target 'vmlinux' failed
> make: *** [vmlinux] Error 1
>
>
> > ---
> > 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#bug-status-tracking for how to communicate with
> > syzbot.