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Message #05449
[Bug 2072501] Re: net:pmtu.sh of ubuntu_kselftests_net and subsequent subtests time out
FYI: I created a portable reproducer for this bug, containing only the parts of pmtu.sh and environment setup required to trigger the bug and sent it upstream. Could also be of value for anyone in this thread who wants to reproduce on different hardware/kernels more easily:
https://lore.kernel.org/all/20240916191857.1082092-1-mitchell.augustin@xxxxxxxxxxxxx/
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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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References
