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Type: Bug
Resolution: Done-Errata
Priority: Undefined
Fix Version/s: rhel-9.4
Affects Version/s: rhel-9.2.0
Component/s: kernel / Networking
Labels:
- MigratedToJIRA

Fixed in Build:
kernel-5.14.0-404.el9
Regression:
None
Severity:
Low

Pool Team:

rhel-sst-networking-core
Sub-System Group:

ssg_networking

Dev Target Milestone:
21
Internal Target Milestone:
22
Story Points:
None
ACKs Check:

QE ack
Blocked:
False
Blocked Reason:

Hide

None

Show
None
Product Documentation Required:
None
Sprint:
None

Preliminary Testing:
Pass
Test Link:
https://gitlab.cee.redhat.com/kernel-qe/kernel/-/tree/master/networking/route/route_func?ref_type=heads
Testable Builds:

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The following Merge Request has pipeline job artifacts available:

Title: net: fix src route notification issues
MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/3235
MR Pipeline: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/pipelines/1115064404

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----------------------------------------

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----------------------------------------

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5.14.0-401.353.3235_1115064404.el9iv.aarch64:
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----------------------------------------

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----------------------------------------

Updated 2023-12-21 03:37 UTC by buglinker:
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Show
The following Merge Request has pipeline job artifacts available: Title: net: fix src route notification issues MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/3235 MR Pipeline: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/pipelines/1115064404 The Repo URLs are *not* accessible from a web browser! They only function as a dnf or yum baseurl. Artifacts expire six weeks after creation. If artifacts are needed after that time please rerun the pipeline by visiting the MR's 'Pipelines' tab and clicking the 'Run pipeline' button. ---------------------------------------- Downstream Pipeline Name: RHEL_COMPAT (c9s_rhel9_compat_merge_request) Downstream Pipeline: https://gitlab.com/redhat/red-hat-ci-tools/kernel/cki-internal-pipelines/cki-internal-contributors/-/pipelines/1115064434 Repo URL: https://s3.upshift.redhat.com/DH-PROD-CKI/internal/1115064434/$basearch/5.14.0-401.3235_1115064404.el9.$basearch Debug Repo URL: https://s3.upshift.redhat.com/DH-PROD-CKI/internal/1115064434/$basearch-debug/5.14.0-401.3235_1115064404.el9.$basearch 5.14.0-401.3235_1115064404.el9.s390x: Artifacts (RPMs): https://s3.upshift.redhat.com/DH-PROD-CKI/index.html?prefix=internal-artifacts/1115064434/publish_s390x/5799027054/artifacts/repo/5.14.0-401.3235_1115064404.el9.s390x/ 5.14.0-401.3235_1115064404.el9.aarch64: Artifacts (RPMs): https://s3.upshift.redhat.com/DH-PROD-CKI/index.html?prefix=internal-artifacts/1115064434/publish_aarch64/5799027053/artifacts/repo/5.14.0-401.3235_1115064404.el9.aarch64/ 5.14.0-401.3235_1115064404.el9.ppc64le: Artifacts (RPMs): https://s3.upshift.redhat.com/DH-PROD-CKI/index.html?prefix=internal-artifacts/1115064434/publish_ppc64le/5799027051/artifacts/repo/5.14.0-401.3235_1115064404.el9.ppc64le/ 5.14.0-401.3235_1115064404.el9.x86_64-debug: Artifacts (RPMs): https://s3.upshift.redhat.com/DH-PROD-CKI/index.html?prefix=internal-artifacts/1115064434/publish_x86_64_debug/5799027050/artifacts/repo/5.14.0-401.3235_1115064404.el9.x86_64/ 5.14.0-401.3235_1115064404.el9.x86_64: Artifacts (RPMs): https://s3.upshift.redhat.com/DH-PROD-CKI/index.html?prefix=internal-artifacts/1115064434/publish_x86_64/5799027048/artifacts/repo/5.14.0-401.3235_1115064404.el9.x86_64/ ---------------------------------------- Downstream Pipeline Name: REALTIME (c9s_rt_merge_request) Downstream Pipeline: https://gitlab.com/redhat/red-hat-ci-tools/kernel/cki-internal-pipelines/cki-trusted-contributors/-/pipelines/1115064452 5.14.0-401.3235_1115064404.el9.x86_64-debug: Artifacts (RPMs): https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/index.html?prefix=trusted-artifacts/1115064452/publish_x86_64_debug/5799027164/artifacts/repo/5.14.0-401.3235_1115064404.el9.x86_64/ Repo URL: https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/trusted-artifacts/1115064452/publish_x86_64_debug/5799027164/artifacts/repo/5.14.0-401.3235_1115064404.el9.x86_64/ 5.14.0-401.3235_1115064404.el9.x86_64: Artifacts (RPMs): https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/index.html?prefix=trusted-artifacts/1115064452/publish_x86_64/5799027159/artifacts/repo/5.14.0-401.3235_1115064404.el9.x86_64/ Repo URL: https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/trusted-artifacts/1115064452/publish_x86_64/5799027159/artifacts/repo/5.14.0-401.3235_1115064404.el9.x86_64/ ---------------------------------------- Downstream Pipeline Name: AUTOMOTIVE (c9s_automotive_check_merge_request) Downstream Pipeline: https://gitlab.com/redhat/red-hat-ci-tools/kernel/cki-internal-pipelines/cki-trusted-contributors/-/pipelines/1115064460 5.14.0-401.353.3235_1115064404.el9iv.aarch64-debug: Artifacts (RPMs): https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/index.html?prefix=trusted-artifacts/1115064460/publish_aarch64_debug/5799027235/artifacts/repo/5.14.0-401.353.3235_1115064404.el9iv.aarch64/ Repo URL: https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/trusted-artifacts/1115064460/publish_aarch64_debug/5799027235/artifacts/repo/5.14.0-401.353.3235_1115064404.el9iv.aarch64/ 5.14.0-401.353.3235_1115064404.el9iv.aarch64: Artifacts (RPMs): https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/index.html?prefix=trusted-artifacts/1115064460/publish_aarch64/5799027233/artifacts/repo/5.14.0-401.353.3235_1115064404.el9iv.aarch64/ Repo URL: 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Test Coverage:

Automated

Release Note Type:
If docs needed, set a value

Experience:
Architecture:

Unspecified
Bugzilla Bug:
RHBZ: 2170513

SFDC Cases Counter:
SFDC Cases Open:
SFDC Cases Links:

Planning:
None

For the "src" attribute (RTA_SRC) of a route, kernel requires that such an address is actually configured. It doesn't need to be on the same interface though...

When the address gets removed, kernel will also remove the route with the corresponding "src" attribute. However, it fails to send RTM_DELROUTE notification:

>>>>
#!/bin/bash

set -ex

ip netns del x &>/dev/null || :
ip netns add x

ip -netns x link add net1 type dummy
ip -netns x link add net2 type dummy
ip -netns x link set net1 up
ip -netns x link set net2 up

ip -netns x addr add 192.168.5.5/24 dev net1
ip -netns x route append 7.7.7.0/24 dev net2 src 192.168.5.5

ip -netns x -4 addr
ip -netns x -4 route

ip -netns x monitor addr &
ip -netns x monitor route &

sleep 0.2

ip -netns x addr del 192.168.5.5/24 dev net1
ip -netns x -4 route

sleep 0.2

kill – $(jobs -p)
wait
wait
<<<<

On rhel-9.2 (5.14.0-267.el9.x86_64) and Fedora 37 (6.1.8-200.fc37.x86_64) above script gives:

<<<<
+ ip netns del x
+ ip netns add x
+ ip -netns x link add net1 type dummy
+ ip -netns x link add net2 type dummy
+ ip -netns x link set net1 up
+ ip -netns x link set net2 up
+ ip -netns x addr add 192.168.5.5/24 dev net1
+ ip -netns x route append 7.7.7.0/24 dev net2 src 192.168.5.5
+ ip -netns x -4 addr
2: net1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
inet 192.168.5.5/24 scope global net1
valid_lft forever preferred_lft forever
+ ip -netns x -4 route
7.7.7.0/24 dev net2 scope link src 192.168.5.5
192.168.5.0/24 dev net1 proto kernel scope link src 192.168.5.5
+ ip -netns x monitor addr
+ sleep 0.2
+ ip -netns x monitor route
+ ip -netns x addr del 192.168.5.5/24 dev net1
Deleted 2: net1 inet 192.168.5.5/24 scope global net1
Deleted 192.168.5.0/24 dev net1 proto kernel scope link src 192.168.5.5
valid_lft forever preferred_lft forever
Deleted broadcast 192.168.5.255 dev net1 table local proto kernel scope link src 192.168.5.5
Deleted local 192.168.5.5 dev net1 table local proto kernel scope host src 192.168.5.5
+ ip -netns x -4 route
+ sleep 0.2
++ jobs -p
+ kill – 18111 18112
+ wait
+ wait
>>>

Note that there is no notification about the route on net2 being removed, but it's not longer there.

Sending accurate events is important to NetworkManager, because it keeps a cache of the routes. Missing/Wrong events mean that the cache becomes inconsistent.

is duplicated by

RHEL-6013 Missing netlink event for removed route with src attribute