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Date:   Fri, 29 Nov 2019 06:54:47 +0100
From:   Lukas Bulwahn <>
To:     Tetsuo Handa <>
Cc:     syzbot <>,
        YueHaibing <>,
        Jouni Hogander <>,
        Julian Anastasov <>,,
        Dmitry Vyukov <>,
        Linux Kernel Mailing List <>,
        Netdev <>,,
        Hulk Robot <>,
        "David S. Miller" <>
Subject: Re: unregister_netdevice: waiting for DEV to become free (2)

On Thu, Nov 28, 2019 at 10:56 AM Tetsuo Handa
<> wrote:
> Hello people involved in commit a3e23f719f5c4a38 ("net-sysfs: call dev_hold if kobject_init_and_add success")
> and commit b8eb718348b8fb30 ("net-sysfs: Fix reference count leak in rx|netdev_queue_add_kobject").
> syzbot is reporting that unregister_netdevice() hangs due to underflowing
> device refcount when kobject_init_and_add() failed due to -ENOMEM.

Tetsuo, would you happen to have a C reproducer program that creates
the trace you reported?

I could not quickly find one that by the date would fit to when we
included our change on this syzbot page:

Jouni, can you please follow up on this report.



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