linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Cong Wang <xiyou.wangcong@gmail.com>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: David Miller <davem@davemloft.net>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Eric Dumazet <edumazet@google.com>,
	Willem de Bruijn <willemb@google.com>,
	Jakub Kicinski <jakub.kicinski@netronome.com>,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	netdev <netdev@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	syzkaller <syzkaller@googlegroups.com>
Subject: Re: net: hang in unregister_netdevice: waiting for lo to become free
Date: Tue, 30 Jan 2018 10:32:26 -0800	[thread overview]
Message-ID: <CAM_iQpVo0iSXKSR=Qc+7syn77BnhE2R72M2u5YfJF=fBkJHjsw@mail.gmail.com> (raw)
In-Reply-To: <CACT4Y+ZyUxeUqEB7q1EHcs4j93mtk9UOBuYhJtcnnc8AfApoLw@mail.gmail.com>

On Tue, Jan 30, 2018 at 4:09 AM, Dmitry Vyukov <dvyukov@google.com> wrote:
> Hello,
>
> The following program creates a hang in unregister_netdevice.
> cleanup_net work hangs there forever periodically printing
> "unregister_netdevice: waiting for lo to become free. Usage count = 3"
> and creation of any new network namespaces hangs forever.

Interestingly, this is not reproducible on net-next.

  reply	other threads:[~2018-01-30 18:32 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-30 12:09 net: hang in unregister_netdevice: waiting for lo to become free Dmitry Vyukov
2018-01-30 18:32 ` Cong Wang [this message]
2018-01-30 20:08   ` Daniel Borkmann
2018-01-30 20:57     ` David Ahern
2018-01-30 22:59       ` David Ahern
2018-02-01  0:49         ` Xin Long
2018-02-03 12:15           ` Xin Long
2018-02-19 18:59             ` Dmitry Vyukov
2018-02-20  7:56               ` Tommi Rantala
2018-02-20  8:14                 ` Dmitry Vyukov
2018-02-20 16:26                   ` Neil Horman
2018-02-21 14:53                     ` Tommi Rantala
2018-04-12 12:15                       ` Dmitry Vyukov
2018-04-13 11:37                         ` Neil Horman
2018-04-13 12:43                         ` Dan Streetman
2018-04-13 15:54                           ` Dmitry Vyukov
2018-04-16  7:35                             ` Dmitry Vyukov
2018-04-16 19:42                               ` Dan Streetman
2018-05-10  6:46                                 ` Dmitry Vyukov
2018-05-10 10:23                                   ` Dan Streetman
2018-05-11  9:19                                     ` Dmitry Vyukov
2018-05-11 11:40                                       ` Dan Streetman

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAM_iQpVo0iSXKSR=Qc+7syn77BnhE2R72M2u5YfJF=fBkJHjsw@mail.gmail.com' \
    --to=xiyou.wangcong@gmail.com \
    --cc=daniel@iogearbox.net \
    --cc=davem@davemloft.net \
    --cc=dvyukov@google.com \
    --cc=edumazet@google.com \
    --cc=jakub.kicinski@netronome.com \
    --cc=kuznet@ms2.inr.ac.ru \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux@rasmusvillemoes.dk \
    --cc=netdev@vger.kernel.org \
    --cc=syzkaller@googlegroups.com \
    --cc=willemb@google.com \
    --cc=yoshfuji@linux-ipv6.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).