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Date: Sat, 7 Jan 2023 02:17:07 +0100
From: Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
To: Guillaume Nault <gnault@...hat.com>
Cc: linux-kselftest@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: BUG: tools/testing/selftests/net/l2_tos_ttl_inherit.sh hangs when
selftest restarted
On 07. 01. 2023. 01:14, Guillaume Nault wrote:
> On Fri, Jan 06, 2023 at 02:44:11AM +0100, Mirsad Goran Todorovac wrote:
>> [root@...mtodorov linux_torvalds]# tools/testing/selftests/net/l2_tos_ttl_inherit.sh
>> ┌────────┬───────┬───────┬──────────────┬──────────────┬───────┬────────┐
>> ├────────┼───────┼───────┼──────────────┼──────────────┼───────┼────────┤
>> │ Type │ outer | inner │ tos │ ttl │ vlan │ result │
>> ├────────┼───────┼───────┼──────────────┼──────────────┼───────┼────────┤
>> │ gre │ 4 │ 4 │ inherit 0xc4 │ inherit 116 │ false │Cannot create namespace file "/var/run/netns/testing": File exists
>> RTNETLINK answers: File exists
>> RTNETLINK answers: File exists
>> RTNETLINK answers: File exists
>
> You probably have leftovers from a previous test case. In particular
> the "testing" network name space already exists, which prevents the
> script from creating it. You can delete it manually with
> "ip netns del testing". If this netns is there because of a previous
> incomplete run of l2_tos_ttl_inherit.sh, then you'll likely need to
> also remove the tunnel interface it created in your current netns
> ("ip link del tep0").
Thanks, it worked :)
> Ideally this script wouldn't touch the current netns and would clean up
> its environment in all cases upon exit. I have a patch almost ready
> that does just that.
As these interfaces were not cleared by "make kselftest-clean",
this patch with a cleanup trap would be most welcome.
However, after the cleanup above, the ./l2_tos_ttl_inherit.sh
script hangs at the spot where it did in the first place (but
only on Lenovo desktop 10TX000VCR with BIOS M22KT49A from
11/10/2022, AlmaLinux 8.7, and kernel 6.2-rc2; not on Lenovo
Ideapad3 with Ubuntu 22.10, where it worked like a charm with
the same kernel RC).
The point of hang is this:
[root@...mtodorov net]# ./l2_tos_ttl_inherit.sh
┌────────┬───────┬───────┬──────────────┬──────────────┬───────┬────────┐
├────────┼───────┼───────┼──────────────┼──────────────┼───────┼────────┤
│ Type │ outer | inner │ tos │ ttl │ vlan │ result │
├────────┼───────┼───────┼──────────────┼──────────────┼───────┼────────┤
│ gre │ 4 │ 4 │ inherit 0xb8 │ inherit 102 │ false │ OK │
│ gre │ 4 │ 4 │ inherit 0x10 │ inherit 53 │ true │ OK │
│ gre │ 4 │ 4 │ fixed 0xa8 │ fixed 230 │ false │ OK │
│ gre │ 4 │ 4 │ fixed 0x0c │ fixed 96 │ true │ OK │
├────────┼───────┼───────┼──────────────┼──────────────┼───────┼────────┤
│ gre │ 4 │ 6 │ inherit 0xbc │ inherit 159 │ false │ OK │
│ gre │ 4 │ 6 │ inherit 0x5c │ inherit 242 │ true │ OK │
│ gre │ 4 │ 6 │ fixed 0x38 │ fixed 113 │ false │ OK │
│ gre │ 4 │ 6 │ fixed 0x78 │ fixed 34 │ true │ OK │
├────────┼───────┼───────┼──────────────┼──────────────┼───────┼────────┤
│ gre │ 4 │ other │ inherit 0xec │ inherit 69 │ false │ OK │
│ gre │ 4 │ other │ inherit 0xf0 │ inherit 201 │ true │ OK │
│ gre │ 4 │ other │ fixed 0xec │ fixed 14 │ false │ OK │
│ gre │ 4 │ other │ fixed 0xe4 │ fixed 15 │ true │ OK │
├────────┼───────┼───────┼──────────────┼──────────────┼───────┼────────┤
│ Type │ outer | inner │ tos │ ttl │ vlan │ result │
├────────┼───────┼───────┼──────────────┼──────────────┼───────┼────────┤
│ gre │ 6 │ 4 │ inherit 0xc4 │ inherit 21 │ false │ OK │
│ gre │ 6 │ 4 │ inherit 0xc8 │ inherit 230 │ true │ OK │
│ gre │ 6 │ 4 │ fixed 0x24 │ fixed 193 │ false │ OK │
│ gre │ 6 │ 4 │ fixed 0x1c │ fixed 200 │ true │ OK │
├────────┼───────┼───────┼──────────────┼──────────────┼───────┼────────┤
│ gre │ 6 │ 6 │ inherit 0xe4 │ inherit 81 │ false │ OK │
│ gre │ 6 │ 6 │ inherit 0xa4 │ inherit 130 │ true │ OK │
│ gre │ 6 │ 6 │ fixed 0x18 │ fixed 140 │ false │ OK │
│ gre │ 6 │ 6 │ fixed 0xc8 │ fixed 175 │ true │ OK │
├────────┼───────┼───────┼──────────────┼──────────────┼───────┼────────┤
│ gre │ 6 │ other │ inherit 0x74 │ inherit 142 │ false │ OK │
│ gre │ 6 │ other │ inherit 0x50 │ inherit 125 │ true │ OK │
│ gre │ 6 │ other │ fixed 0x90 │ fixed 84 │ false │ OK │
│ gre │ 6 │ other │ fixed 0xb8 │ fixed 240 │ true │ OK │
├────────┼───────┼───────┼──────────────┼──────────────┼───────┼────────┤
│ Type │ outer | inner │ tos │ ttl │ vlan │ result │
├────────┼───────┼───────┼──────────────┼──────────────┼───────┼────────┤
│ vxlan │ 4 │ 4 │ inherit 0xb4 │ inherit 93 │ false │
Developers usually ask for bash -x output of the script that failed or hung
when reporting problems (too long for an email):
https://domac.alu.unizg.hr/~mtodorov/linux/selftests/net-namespace-20230106/bash-l2_tos_ttl_inherit.html
dmesg might be useful:
https://domac.alu.unizg.hr/~mtodorov/linux/selftests/net-namespace-20230106/dmesg-20230107.txt
Hope this helps.
I am rather new to namespaces, so I can't help more than that with the current
state of my learning curve :)
Thanks,
Mirsad
--
Mirsad Goran Todorovac
Sistem inženjer
Grafički fakultet | Akademija likovnih umjetnosti
Sveučilište u Zagrebu
--
System engineer
Faculty of Graphic Arts | Academy of Fine Arts
University of Zagreb, Republic of Croatia
The European Union
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