Additional datapoint: Bug state still manifests even when the `trace`
calls in this test case are commented out, so the problem is not related
to a lingering tcpdump process originating there.
The issue seems to only manifest as a consequence of the ping running in the
following section of pmtu.sh/test_pmtu_ipvX_over_ipvY_exception()
(ipv6_over_ipv6, called as `test_pmtu_ipvX_over_ipvY_exception 6 6`):
# Create route exception by exceeding link layer MTU
mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
mtu "${ns_b}" veth_B-R1 ${ll_mtu}
mtu "${ns_r1}" veth_R1-B ${ll_mtu}
mtu "${ns_a}" ip_a $((${ll_mtu} + 1000)) || return
mtu "${ns_b}" ip_b $((${ll_mtu} + 1000)) || return
run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500))
${dst}
when the routing rules for the nexthop variant of the test have been
imposed by calling setup_routing_new()
(during the “PMTU exceptions - nexthop objects” test)
--
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https://bugs.launchpad.net/bugs/2072501
Title:
net:pmtu.sh of ubuntu_kselftests_net and subsequent subtests time out
Status in ubuntu-kernel-tests:
New
Bug description:
Found on N-nvidia-64k with node hinyari. After net:pmtu.sh times out,
these tests also timeout until "TEST SYSTEM FAILURE DETECTED" is
eventually triggered: net:udpgso.sh, net:ip_defrag.sh,
net:udpgso_bench.sh, net:fib_rule_tests.sh.
14:44:14 INFO | START ubuntu_kselftests_net.net:pmtu.sh
ubuntu_kselftests_net.net:pmtu.sh timeout=2700 timestamp=1719413054
localtime=Jun 26 14:44:14
14:44:14 DEBUG| Persistent state client._record_indent now set to 2
14:44:14 DEBUG| Persistent state client.unexpected_reboot now set to
('ubuntu_kselftests_net.net:pmtu.sh', 'ubuntu_kselftests_net.net:pmtu.sh')
14:44:14 DEBUG| Waiting for pid 43936 for 2700 seconds
14:44:14 WARNI| System python is too old, crash handling disabled
14:44:14 DEBUG| Running 'make run_tests -C net TEST_PROGS=pmtu.sh
TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
14:44:14 DEBUG| [stdout] make: Entering directory
'/home/ubuntu/autotest/client/tmp/ubuntu_kselftests_net/src/linux/tools/testing/selftests/net'
14:44:14 DEBUG| [stdout] TAP version 13
14:44:14 DEBUG| [stdout] 1..1
14:44:14 DEBUG| [stdout] # timeout set to 0
14:44:14 DEBUG| [stdout] # selftests: net: pmtu.sh
14:44:14 DEBUG| [stdout] # TEST: ipv4: PMTU exceptions
[ OK ]
14:44:14 DEBUG| [stdout] # TEST: ipv4: PMTU exceptions - nexthop objects
[ OK ]
14:44:14 DEBUG| [stdout] # TEST: ipv6: PMTU exceptions
[ OK ]
14:44:14 DEBUG| [stdout] # TEST: ipv6: PMTU exceptions - nexthop objects
[ OK ]
14:44:14 DEBUG| [stdout] # TEST: ICMPv4 with DSCP and ECN: PMTU exceptions
[ OK ]
14:44:15 DEBUG| [stdout] # TEST: ICMPv4 with DSCP and ECN: PMTU exceptions -
nexthop objects [ OK ]
14:44:15 DEBUG| [stdout] # 2024/06/26 14:44:15 socat[44926] E
xioopen_ipdgram_listen(): unknown address family 0
14:44:15 DEBUG| [stdout] # TEST: UDPv4 with DSCP and ECN: PMTU exceptions
[ OK ]
14:44:15 DEBUG| [stdout] # ./pmtu.sh: line 937: kill: (44926) - No such
process
14:44:15 DEBUG| [stdout] # 2024/06/26 14:44:15 socat[45066] E
xioopen_ipdgram_listen(): unknown address family 0
14:44:15 DEBUG| [stdout] # TEST: UDPv4 with DSCP and ECN: PMTU exceptions -
nexthop objects [ OK ]
14:44:15 DEBUG| [stdout] # ./pmtu.sh: line 937: kill: (45066) - No such
process
14:44:16 DEBUG| [stdout] # TEST: IPv4 over vxlan4: PMTU exceptions
[ OK ]
14:44:17 DEBUG| [stdout] # TEST: IPv4 over vxlan4: PMTU exceptions - nexthop
objects [ OK ]
14:44:18 DEBUG| [stdout] # TEST: IPv6 over vxlan4: PMTU exceptions
[ OK ]
14:44:19 DEBUG| [stdout] # TEST: IPv6 over vxlan4: PMTU exceptions - nexthop
objects [ OK ]
14:44:20 DEBUG| [stdout] # TEST: IPv4 over vxlan6: PMTU exceptions
[ OK ]
14:44:22 DEBUG| [stdout] # TEST: IPv4 over vxlan6: PMTU exceptions - nexthop
objects [ OK ]
14:44:23 DEBUG| [stdout] # TEST: IPv6 over vxlan6: PMTU exceptions
[ OK ]
14:44:24 DEBUG| [stdout] # TEST: IPv6 over vxlan6: PMTU exceptions - nexthop
objects [ OK ]
14:44:25 DEBUG| [stdout] # TEST: IPv4 over geneve4: PMTU exceptions
[ OK ]
14:44:26 DEBUG| [stdout] # TEST: IPv4 over geneve4: PMTU exceptions - nexthop
objects [ OK ]
14:44:27 DEBUG| [stdout] # TEST: IPv6 over geneve4: PMTU exceptions
[ OK ]
14:44:28 DEBUG| [stdout] # TEST: IPv6 over geneve4: PMTU exceptions - nexthop
objects [ OK ]
14:44:30 DEBUG| [stdout] # TEST: IPv4 over geneve6: PMTU exceptions
[ OK ]
14:44:31 DEBUG| [stdout] # TEST: IPv4 over geneve6: PMTU exceptions - nexthop
objects [ OK ]
14:44:32 DEBUG| [stdout] # TEST: IPv6 over geneve6: PMTU exceptions
[ OK ]
14:44:33 DEBUG| [stdout] # TEST: IPv6 over geneve6: PMTU exceptions - nexthop
objects [ OK ]
14:44:35 DEBUG| [stdout] # TEST: IPv4, bridged vxlan4: PMTU exceptions
[ OK ]
14:44:37 DEBUG| [stdout] # TEST: IPv4, bridged vxlan4: PMTU exceptions -
nexthop objects [ OK ]
14:44:40 DEBUG| [stdout] # TEST: IPv6, bridged vxlan4: PMTU exceptions
[ OK ]
14:44:42 DEBUG| [stdout] # TEST: IPv6, bridged vxlan4: PMTU exceptions -
nexthop objects [ OK ]
14:44:44 DEBUG| [stdout] # TEST: IPv4, bridged vxlan6: PMTU exceptions
[ OK ]
14:44:46 DEBUG| [stdout] # TEST: IPv4, bridged vxlan6: PMTU exceptions -
nexthop objects [ OK ]
14:44:49 DEBUG| [stdout] # TEST: IPv6, bridged vxlan6: PMTU exceptions
[ OK ]
14:44:51 DEBUG| [stdout] # TEST: IPv6, bridged vxlan6: PMTU exceptions -
nexthop objects [ OK ]
14:44:53 DEBUG| [stdout] # TEST: IPv4, bridged geneve4: PMTU exceptions
[ OK ]
14:44:55 DEBUG| [stdout] # TEST: IPv4, bridged geneve4: PMTU exceptions -
nexthop objects [ OK ]
14:44:58 DEBUG| [stdout] # TEST: IPv6, bridged geneve4: PMTU exceptions
[ OK ]
14:45:00 DEBUG| [stdout] # TEST: IPv6, bridged geneve4: PMTU exceptions -
nexthop objects [ OK ]
14:45:02 DEBUG| [stdout] # TEST: IPv4, bridged geneve6: PMTU exceptions
[ OK ]
14:45:04 DEBUG| [stdout] # TEST: IPv4, bridged geneve6: PMTU exceptions -
nexthop objects [ OK ]
14:45:07 DEBUG| [stdout] # TEST: IPv6, bridged geneve6: PMTU exceptions
[ OK ]
14:45:09 DEBUG| [stdout] # TEST: IPv6, bridged geneve6: PMTU exceptions -
nexthop objects [ OK ]
14:45:09 DEBUG| [stdout] # ovs_bridge not supported
14:45:09 DEBUG| [stdout] # TEST: IPv4, OVS vxlan4: PMTU exceptions
[SKIP]
14:45:09 DEBUG| [stdout] # ovs_bridge not supported
14:45:09 DEBUG| [stdout] # TEST: IPv6, OVS vxlan4: PMTU exceptions
[SKIP]
14:45:09 DEBUG| [stdout] # ovs_bridge not supported
14:45:09 DEBUG| [stdout] # TEST: IPv4, OVS vxlan6: PMTU exceptions
[SKIP]
14:45:09 DEBUG| [stdout] # ovs_bridge not supported
14:45:09 DEBUG| [stdout] # TEST: IPv6, OVS vxlan6: PMTU exceptions
[SKIP]
14:45:09 DEBUG| [stdout] # ovs_bridge not supported
14:45:09 DEBUG| [stdout] # TEST: IPv4, OVS geneve4: PMTU exceptions
[SKIP]
14:45:10 DEBUG| [stdout] # ovs_bridge not supported
14:45:10 DEBUG| [stdout] # TEST: IPv6, OVS geneve4: PMTU exceptions
[SKIP]
14:45:10 DEBUG| [stdout] # ovs_bridge not supported
14:45:10 DEBUG| [stdout] # TEST: IPv4, OVS geneve6: PMTU exceptions
[SKIP]
14:45:10 DEBUG| [stdout] # ovs_bridge not supported
14:45:10 DEBUG| [stdout] # TEST: IPv6, OVS geneve6: PMTU exceptions
[SKIP]
14:45:11 DEBUG| [stdout] # TEST: IPv4 over fou4: PMTU exceptions
[ OK ]
14:45:11 DEBUG| [stdout] # TEST: IPv4 over fou4: PMTU exceptions - nexthop
objects [ OK ]
14:45:11 DEBUG| [stdout] # TEST: IPv6 over fou4: PMTU exceptions
[ OK ]
14:45:12 DEBUG| [stdout] # TEST: IPv6 over fou4: PMTU exceptions - nexthop
objects [ OK ]
14:45:12 DEBUG| [stdout] # TEST: IPv4 over fou6: PMTU exceptions
[ OK ]
14:45:12 DEBUG| [stdout] # TEST: IPv4 over fou6: PMTU exceptions - nexthop
objects [ OK ]
14:45:12 DEBUG| [stdout] # TEST: IPv6 over fou6: PMTU exceptions
[ OK ]
14:45:13 DEBUG| [stdout] # TEST: IPv6 over fou6: PMTU exceptions - nexthop
objects [ OK ]
14:45:13 DEBUG| [stdout] # TEST: IPv4 over gue4: PMTU exceptions
[ OK ]
14:45:13 DEBUG| [stdout] # TEST: IPv4 over gue4: PMTU exceptions - nexthop
objects [ OK ]
14:45:13 DEBUG| [stdout] # TEST: IPv6 over gue4: PMTU exceptions
[ OK ]
14:45:14 DEBUG| [stdout] # TEST: IPv6 over gue4: PMTU exceptions - nexthop
objects [ OK ]
14:45:14 DEBUG| [stdout] # TEST: IPv4 over gue6: PMTU exceptions
[ OK ]
14:45:14 DEBUG| [stdout] # TEST: IPv4 over gue6: PMTU exceptions - nexthop
objects [ OK ]
14:45:14 DEBUG| [stdout] # TEST: IPv6 over gue6: PMTU exceptions
[ OK ]
14:45:14 DEBUG| [stdout] # TEST: IPv6 over gue6: PMTU exceptions - nexthop
objects [ OK ]
14:45:15 DEBUG| [stdout] # TEST: IPv4 over IPv4: PMTU exceptions
[ OK ]
14:45:15 DEBUG| [stdout] # TEST: IPv4 over IPv4: PMTU exceptions - nexthop
objects [ OK ]
14:45:15 DEBUG| [stdout] # TEST: IPv6 over IPv4: PMTU exceptions
[ OK ]
14:45:15 DEBUG| [stdout] # TEST: IPv6 over IPv4: PMTU exceptions - nexthop
objects [ OK ]
14:45:15 DEBUG| [stdout] # TEST: IPv4 over IPv6: PMTU exceptions
[ OK ]
14:45:16 DEBUG| [stdout] # TEST: IPv4 over IPv6: PMTU exceptions - nexthop
objects [ OK ]
14:45:16 DEBUG| [stdout] # TEST: IPv6 over IPv6: PMTU exceptions
[ OK ]
14:45:16 DEBUG| [stdout] # TEST: IPv6 over IPv6: PMTU exceptions - nexthop
objects [ OK ]
15:29:14 INFO | Timer expired (2700 sec.), nuking pid 43936
15:29:14 INFO | ERROR ubuntu_kselftests_net.net:pmtu.sh
ubuntu_kselftests_net.net:pmtu.sh timestamp=1719415754 localtime=Jun
26 15:29:14 Test timeout expired, rc=15
15:29:14 INFO | END ERROR ubuntu_kselftests_net.net:pmtu.sh
ubuntu_kselftests_net.net:pmtu.sh timestamp=1719415754 localtime=Jun
26 15:29:14
15:29:14 DEBUG| Persistent state client._record_indent now set to 1
15:29:14 DEBUG| Persistent state client.unexpected_reboot deleted
15:29:14 DEBUG| Test has timeout: 2700 sec.
15:29:14 INFO | START ubuntu_kselftests_net.net:udpgso.sh
ubuntu_kselftests_net.net:udpgso.sh timeout=2700 timestamp=1719415754
localtime=Jun 26 15:29:14
15:29:14 DEBUG| Persistent state client._record_indent now set to 2
15:29:14 DEBUG| Persistent state client.unexpected_reboot now set to
('ubuntu_kselftests_net.net:udpgso.sh', 'ubuntu_kselftests_net.net:udpgso.sh')
15:29:14 DEBUG| Waiting for pid 54956 for 2700 seconds
15:29:14 WARNI| System python is too old, crash handling disabled
15:29:14 DEBUG| Running 'make run_tests -C net TEST_PROGS=udpgso.sh
TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
15:29:14 DEBUG| [stdout] make: Entering directory
'/home/ubuntu/autotest/client/tmp/ubuntu_kselftests_net/src/linux/tools/testing/selftests/net'
15:29:14 DEBUG| [stdout] TAP version 13
15:29:14 DEBUG| [stdout] 1..1
15:29:14 DEBUG| [stdout] # timeout set to 0
15:29:14 DEBUG| [stdout] # selftests: net: udpgso.sh
15:29:14 DEBUG| [stdout] # ipv4 cmsg
16:14:14 INFO | Timer expired (2700 sec.), nuking pid 54956
16:14:14 INFO | ERROR ubuntu_kselftests_net.net:udpgso.sh
ubuntu_kselftests_net.net:udpgso.sh timestamp=1719418454 localtime=Jun
26 16:14:14 Test timeout expired, rc=15
16:14:14 INFO | END ERROR ubuntu_kselftests_net.net:udpgso.sh
ubuntu_kselftests_net.net:udpgso.sh timestamp=1719418454 localtime=Jun
26
...
Accompanied by the following dmesg entries, "waiting for veth_A-R1 to become
free" appears to repeat until the system is shutdown:
[ 574.404587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 584.652587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 594.900587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 605.148587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 615.396587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 625.644587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 635.892587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 646.140587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 656.388587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 666.636587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 676.884586] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 687.132586] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 697.380587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 707.628586] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 717.876586] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 728.124587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 738.284631] INFO: task modprobe:54505 blocked for more than 122 seconds.
[ 738.291488] Not tainted 6.8.0-1009-nvidia-64k #9-Ubuntu
[ 738.297364] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 738.372587] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
[ 748.620586] unregister_netdevice: waiting for veth_A-R1 to become free.
Usage count = 5
...
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