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Date: Sun, 11 Jun 2023 02:52:16 +0200
From: Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
To: netdev@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc: Jay Vosburgh <j.vosburgh@...il.com>, Andy Gospodarek
 <andy@...yhouse.net>, Shuah Khan <shuah@...nel.org>,
 linux-kernel@...r.kernel.org
Subject: [BUG] selftests: drivers/net/bonding:
 bond-arp-interval-causes-panic.sh: Cannot find device "link1_1"

Hi,

The test failed with the latest torvalds tree kernel 6.4-rc5-00305-g022ce8862dff
on AMD Ryzen 9 and Ubuntu 22.04 Jammy.

The config is a merge of Ubuntu generic config and selftest config files.

Debug output with `set -x` is [edited]:

root@...t:selftests/drivers/net/bonding# ./bond-arp-interval-causes-panic.sh
Cannot find device "link1_1"
root@...iant:/home/marvin/linux/kernel/linux_torvalds/tools/testing/selftests/drivers/net/bonding# vi !$
vi ./bond-arp-interval-causes-panic.sh
root@...t:selftests/drivers/net/bonding# ./bond-arp-interval-causes-panic.sh
+ test 0 -ne 0
+ trap finish EXIT
+ client_ip4=192.168.1.198
+ server_ip4=192.168.1.254
+ echo 180
+ ip link add dev link1_1 type veth peer name link1_2
+ ip netns add server
+ ip link set dev link1_2 netns server up name eth0
+ ip netns exec server ip addr add 192.168.1.254/24 dev eth0
+ ip netns add client
+ ip link set dev link1_1 netns client down name eth0
+ ip netns exec client ip link add dev bond0 down type bond mode 1 miimon 100 all_slaves_active 1
+ ip netns exec client ip link set dev eth0 down master bond0
+ ip netns exec client ip link set dev bond0 up
+ ip netns exec client ip addr add 192.168.1.198/24 dev bond0
+ ip netns exec client ping -c 5 192.168.1.254
+ finish
+ ip netns delete server
+ ip netns delete client
+ ip link del link1_1
Cannot find device "link1_1"
+ true
root@...t:testing/selftests/drivers/net/bonding# uname -rms
Linux 6.4.0-rc5-kmlk-netdbg-iwlwifi-00305-g022ce8862dff x86_64
root@...t:testing/selftests/drivers/net/bonding#

Some debugging:

I have added some "ip link show" commands in the finish() function:

finish()
{
         ip link show
         ip netns delete server || true
         ip netns delete client || true
         ip link show
         ip link del link1_1 || true
}

Now the debug output is like this:

root@...t:selftests/drivers/net/bonding# ./bond-arp-interval-causes-panic.sh
+ test 0 -ne 0
+ trap finish EXIT
+ client_ip4=192.168.1.198
+ server_ip4=192.168.1.254
+ echo 180
+ ip link add dev link1_1 type veth peer name link1_2
+ ip netns add server
+ ip link set dev link1_2 netns server up name eth0
+ ip netns exec server ip addr add 192.168.1.254/24 dev eth0
+ ip netns add client
+ ip link set dev link1_1 netns client down name eth0
+ ip netns exec client ip link add dev bond0 down type bond mode 1 miimon 100 all_slaves_active 1
+ ip netns exec client ip link set dev eth0 down master bond0
+ ip netns exec client ip link set dev bond0 up
+ ip netns exec client ip addr add 192.168.1.198/24 dev bond0
+ ip netns exec client ping -c 5 192.168.1.254
+ finish
+ ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 02:fc:ca:49:e2:d4 brd ff:ff:ff:ff:ff:ff
3: tunl0@...E: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ipip 0.0.0.0 brd 0.0.0.0
4: gre0@...E: <NOARP> mtu 1476 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/gre 0.0.0.0 brd 0.0.0.0
5: gretap0@...E: <BROADCAST,MULTICAST> mtu 1462 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
6: erspan0@...E: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
7: ip_vti0@...E: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ipip 0.0.0.0 brd 0.0.0.0
8: ip6_vti0@...E: <NOARP> mtu 1332 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/tunnel6 :: brd :: permaddr 325b:a7df:c8db::
9: sit0@...E: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/sit 0.0.0.0 brd 0.0.0.0
10: ip6tnl0@...E: <NOARP> mtu 1452 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/tunnel6 :: brd :: permaddr 76d3:be76:4187::
11: ip6gre0@...E: <NOARP> mtu 1448 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/gre6 :: brd :: permaddr 569b:65fd:b94b::
12: enp16s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
     link/ether 9c:6b:00:01:fb:80 brd ff:ff:ff:ff:ff:ff
+ ip netns delete server
+ ip netns delete client
+ ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 02:fc:ca:49:e2:d4 brd ff:ff:ff:ff:ff:ff
3: tunl0@...E: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ipip 0.0.0.0 brd 0.0.0.0
4: gre0@...E: <NOARP> mtu 1476 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/gre 0.0.0.0 brd 0.0.0.0
5: gretap0@...E: <BROADCAST,MULTICAST> mtu 1462 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
6: erspan0@...E: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
7: ip_vti0@...E: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ipip 0.0.0.0 brd 0.0.0.0
8: ip6_vti0@...E: <NOARP> mtu 1332 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/tunnel6 :: brd :: permaddr 325b:a7df:c8db::
9: sit0@...E: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/sit 0.0.0.0 brd 0.0.0.0
10: ip6tnl0@...E: <NOARP> mtu 1452 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/tunnel6 :: brd :: permaddr 76d3:be76:4187::
11: ip6gre0@...E: <NOARP> mtu 1448 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/gre6 :: brd :: permaddr 569b:65fd:b94b::
12: enp16s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
     link/ether 9c:6b:00:01:fb:80 brd ff:ff:ff:ff:ff:ff
+ ip link del link1_1
Cannot find device "link1_1"
+ true
root@...t:selftests/drivers/net/bonding#

Adding more `ip link show` before and after operations with link_1
had shown that `ip link set dev link1_1 netns client down name eth0` command
shuts down the link, so the `ip link del link1_1` doesn't succeed, as seen
here:

+ ip netns exec server ip addr add 192.168.1.254/24 dev eth0
+ ip netns add client
+ ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 02:fc:ca:49:e2:d4 brd ff:ff:ff:ff:ff:ff
3: tunl0@...E: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ipip 0.0.0.0 brd 0.0.0.0
4: gre0@...E: <NOARP> mtu 1476 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/gre 0.0.0.0 brd 0.0.0.0
5: gretap0@...E: <BROADCAST,MULTICAST> mtu 1462 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
6: erspan0@...E: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
7: ip_vti0@...E: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ipip 0.0.0.0 brd 0.0.0.0
8: ip6_vti0@...E: <NOARP> mtu 1332 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/tunnel6 :: brd :: permaddr 325b:a7df:c8db::
9: sit0@...E: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/sit 0.0.0.0 brd 0.0.0.0
10: ip6tnl0@...E: <NOARP> mtu 1452 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/tunnel6 :: brd :: permaddr 76d3:be76:4187::
11: ip6gre0@...E: <NOARP> mtu 1448 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/gre6 :: brd :: permaddr 569b:65fd:b94b::
12: enp16s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
     link/ether 9c:6b:00:01:fb:80 brd ff:ff:ff:ff:ff:ff
64: link1_1@...3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 32:d6:de:9f:5d:e2 brd ff:ff:ff:ff:ff:ff link-netns server
+ ip link set dev link1_1 netns client down name eth0
+ ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 02:fc:ca:49:e2:d4 brd ff:ff:ff:ff:ff:ff
3: tunl0@...E: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ipip 0.0.0.0 brd 0.0.0.0
4: gre0@...E: <NOARP> mtu 1476 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/gre 0.0.0.0 brd 0.0.0.0
5: gretap0@...E: <BROADCAST,MULTICAST> mtu 1462 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
6: erspan0@...E: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
7: ip_vti0@...E: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/ipip 0.0.0.0 brd 0.0.0.0
8: ip6_vti0@...E: <NOARP> mtu 1332 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/tunnel6 :: brd :: permaddr 325b:a7df:c8db::
9: sit0@...E: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/sit 0.0.0.0 brd 0.0.0.0
10: ip6tnl0@...E: <NOARP> mtu 1452 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/tunnel6 :: brd :: permaddr 76d3:be76:4187::
11: ip6gre0@...E: <NOARP> mtu 1448 qdisc noop state DOWN mode DEFAULT group default qlen 1000
     link/gre6 :: brd :: permaddr 569b:65fd:b94b::
12: enp16s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
     link/ether 9c:6b:00:01:fb:80 brd ff:ff:ff:ff:ff:ff
+ ip netns exec client ip link add dev bond0 down type bond mode 1 miimon 100 all_slaves_active 1

Hope this helps.

I am not sure what is the right thing to do with this test, and whether it is
the expected behaviour of the kernel.

Best regards,
Mirsad

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