netdev - Re: Urgent Bug report: PPPoE ioctl(PPPIOCCONNECT): Transport endpoint is not connected

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Message-Id: <504E1119-3631-4A2A-BD0C-F74AEE2BDBF5@gmail.com>
Date:   Tue, 14 Sep 2021 13:53:20 +0300
From:   Martin Zaharinov <micron10@...il.com>
To:     Florian Westphal <fw@...len.de>
Cc:     Guillaume Nault <gnault@...hat.com>,
        Pali Rohár <pali@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: Urgent  Bug report: PPPoE ioctl(PPPIOCCONNECT): Transport
 endpoint is not connected

Florian Hi 
One more 

please see i try to remove nf_nat and xt_MASQUERADE 

and on time of problem need 50-80 sec to remove and overload system .

see perf from this moment: 




 PerfTop:    1738 irqs/sec  kernel:85.0%  exact: 100.0% lost: 0/0 drop: 0/0 [4000Hz cycles],  (all, 12 CPUs)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

    40.63%  [nf_conntrack]    [k] nf_ct_iterate_cleanup
    21.23%  [kernel]          [k] __local_bh_enable_ip
    10.93%  [kernel]          [k] __cond_resched
     9.20%  [kernel]          [k] _raw_spin_lock
     8.91%  [kernel]          [k] rcu_all_qs
     5.83%  [nf_conntrack]    [k] nf_conntrack_lock
     0.10%  [kernel]          [k] mutex_spin_on_owner
     0.08%  telegraf          [.] 0x0000000000021bf0
     0.06%  [kernel]          [k] osq_lock
     0.06%  [kernel]          [k] kallsyms_expand_symbol.constprop.0
     0.05%  [kernel]          [k] format_decode
     0.04%  [kernel]          [k] rtnl_fill_ifinfo.constprop.0.isra.0
     0.04%  perf              [.] 0x00000000000bc7b3
     0.04%  [kernel]          [k] memcpy_erms
     0.03%  [kernel]          [k] string
     0.03%  [kernel]          [k] menu_select
     0.03%  [kernel]          [k] nla_put
     0.03%  [kernel]          [k] vsnprintf



Martin

> On 14 Sep 2021, at 12:50, Florian Westphal <fw@...len.de> wrote:
> 
> Guillaume Nault <gnault@...hat.com> wrote:
>>> And on time of problem when try to write : ip a 
>>> to list interface wait 15-20 sec i finaly have options to simulate but users is angry when down internet.
>> 
>> Probably some contention on the rtnl lock.
> 
> Yes, I'll create a patch.