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Re: unregister_netdevice: waiting for eth0 to become free. Usage count = 1

From David Ahern <dsahern@gmail.com>
Newsgroups linux.kernel
Subject Re: unregister_netdevice: waiting for eth0 to become free. Usage count = 1
Date 2017-08-12 02:20 +0200
Message-ID <udsjM-1Rd-7@gated-at.bofh.it> (permalink)
References (7 earlier) <ucOw2-1gs-13@gated-at.bofh.it> <ud0dQ-Jr-17@gated-at.bofh.it> <udlih-5Uh-3@gated-at.bofh.it> <udlV0-6mk-25@gated-at.bofh.it> <udsjM-1Rd-9@gated-at.bofh.it>
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On 8/11/17 6:10 PM, Wei Wang wrote:
> I think we have a potential fix for this issue.
> Martin and I found that when addrconf_dst_alloc() creates a rt6, it is
> possible that rt6->dst.dev points to loopback device while
> rt6->rt6i_idev->dev points to a real device.
> When the real device goes down, the current fib6 clean up code only
> checks for rt6->dst.dev and assumes rt6->rt6i_idev->dev is the same.
> That leaves unreleased refcnt on the real device if rt6->dst.dev
> points to loopback dev.

Yes, host routes and anycast routes.

I have a patch to fix that but it is held up on a few VRF test cases
failing. Hopefully I can get that figured out next week. These unrelated
routes against the loopback device have been a source of a number of
problems (e.g. take down 'lo' and all of IPv6 networking stops for that
namespace).

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Thread

unregister_netdevice: waiting for eth0 to become free. Usage count = 1 John Stultz <john.stultz@linaro.org> - 2017-08-07 23:10 +0200
  Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 John Stultz <john.stultz@linaro.org> - 2017-08-07 23:20 +0200
    Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Cong Wang <xiyou.wangcong@gmail.com> - 2017-08-10 01:40 +0200
      Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 John Stultz <john.stultz@linaro.org> - 2017-08-10 01:50 +0200
        Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-10 02:40 +0200
          Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 John Stultz <john.stultz@linaro.org> - 2017-08-10 02:50 +0200
          Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 John Stultz <john.stultz@linaro.org> - 2017-08-10 03:30 +0200
            Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-10 03:40 +0200
              Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-10 07:50 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 John Stultz <john.stultz@linaro.org> - 2017-08-10 20:20 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-10 22:10 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Cong Wang <xiyou.wangcong@gmail.com> - 2017-08-11 18:50 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-11 19:30 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 David Ahern <dsahern@gmail.com> - 2017-08-12 02:20 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-12 02:30 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 David Ahern <dsahern@gmail.com> - 2017-08-12 05:40 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-12 21:40 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-12 02:20 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 John Stultz <john.stultz@linaro.org> - 2017-08-12 02:40 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-12 02:50 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 John Stultz <john.stultz@linaro.org> - 2017-08-12 05:10 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-12 21:30 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-12 21:30 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Ido Schimmel <idosch@idosch.org> - 2017-08-12 20:20 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-12 21:50 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 David Ahern <dsahern@gmail.com> - 2017-08-13 18:30 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 Wei Wang <weiwan@google.com> - 2017-08-13 23:00 +0200
                Re: unregister_netdevice: waiting for eth0 to become free. Usage  count = 1 David Ahern <dsahern@gmail.com> - 2017-08-14 01:10 +0200

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