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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sun, 8 Aug 2021 18:29:30 +0300
From:   Martin Zaharinov <micron10@...il.com>
To:     Pali Rohár <pali@...nel.org>
Cc:     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

Hi Pali

Kernel 5.13.8


The problem is from kernel 5.8 > I try all major update 5.9, 5.10, 5.11 ,5.12

I use accel-pppd daemon (not pppd) .

And yes after users started to connecting .

When system boot and connect first time all user connect without any problem .
In time of work user disconnect and connect (power cut , fiber cut or other problem in network) , but in time of spike (may be make lock or other problem ) disconnect ~ 400-500 users  and affect other users. Process go to load over 100% and In statistic I see many finishing connection and many start connection. 
And in this time in log get many lines with   ioctl(PPPIOCCONNECT): Transport endpoint is not connected. After finish (unlock or other) stop to see this error and system is back to normal. And connect all disconnected users.

Martin

> On 8 Aug 2021, at 18:23, Pali Rohár <pali@...nel.org> wrote:
> 
> Hello!
> 
> On Sunday 08 August 2021 18:14:09 Martin Zaharinov wrote:
>> Add Pali Rohár,
>> 
>> If have any idea .
>> 
>> Martin
>> 
>>> On 6 Aug 2021, at 7:40, Greg KH <gregkh@...uxfoundation.org> wrote:
>>> 
>>> On Thu, Aug 05, 2021 at 11:53:50PM +0300, Martin Zaharinov wrote:
>>>> Hi Net dev team
>>>> 
>>>> 
>>>> Please check this error :
>>>> Last time I write for this problem : https://www.spinics.net/lists/netdev/msg707513.html
>>>> 
>>>> But not find any solution.
>>>> 
>>>> Config of server is : Bonding port channel (LACP)  > Accel PPP server > Huawei switch.
>>>> 
>>>> Server is work fine users is down/up 500+ users .
>>>> But in one moment server make spike and affect other vlans in same server .
> 
> When this error started to happen? After kernel upgrade? After pppd
> upgrade? Or after system upgrade? Or when more users started to
> connecting?
> 
>>>> And in accel I see many row with this error.
>>>> 
>>>> Is there options to find and fix this bug.
>>>> 
>>>> With accel team I discus this problem  and they claim it is kernel bug and need to find solution with Kernel dev team.
>>>> 
>>>> 
>>>> [2021-08-05 13:52:05.294] vlan912: 24b205903d09718e: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:05.298] vlan912: 24b205903d097162: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:05.626] vlan641: 24b205903d09711b: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:11.000] vlan912: 24b205903d097105: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:17.852] vlan912: 24b205903d0971ae: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:21.113] vlan641: 24b205903d09715b: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:27.963] vlan912: 24b205903d09718d: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:30.249] vlan496: 24b205903d097184: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:30.992] vlan420: 24b205903d09718a: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:33.937] vlan640: 24b205903d0971cd: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:40.032] vlan912: 24b205903d097182: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:40.420] vlan912: 24b205903d0971d5: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:42.799] vlan912: 24b205903d09713a: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:42.799] vlan614: 24b205903d0971e5: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:43.102] vlan912: 24b205903d097190: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:43.850] vlan479: 24b205903d097153: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:43.850] vlan479: 24b205903d097141: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:43.852] vlan912: 24b205903d097198: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:43.977] vlan637: 24b205903d097148: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>> [2021-08-05 13:52:44.528] vlan637: 24b205903d0971c3: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>> 
>>> These are userspace error messages, not kernel messages.
>>> 
>>> What kernel version are you using?
> 
> Yes, we need to know, what kernel version are you using.
> 
>>> thanks,
>>> 
>>> greg k-h
>> 
> 
> And also another question, what version of pppd daemon are you using?
> 
> Also, are you able to dump state of ppp channels and ppp units? It is
> needed to know to which tty device, file descriptor (or socket
> extension) is (or should be) particular ppp channel bounded.