CI: go test ./pkg/datapath/loader fails: Link does not exist #22433
Description
This issue is not observed in CI, however I notice it when running the privileged tests locally in my Ubuntu 22.04 environment against the master branch:
$ sudo -E make tests-privileged [182/26533]
[sudo] password for joe:
PRIVILEGED_TESTS=true PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin:/home/joe/git/cilium/bpf CGO_ENABLED=0 go test -mod=vendor -tags=osusergo -ldflags "-X github.com/cilium/cilium/pkg/kvstore.consulDummyAddress=https://consul:8443 -X github.com/cilium/c
ilium/pkg/kvstore.etcdDummyAddress=http://etcd:4002 -X github.com/cilium/cilium/pkg/datapath.DatapathSHA256=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855" \
./... -test.v -timeout 600s -json -covermode=count -coverprofile=coverage.out | tparse
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ FAIL package: github.com/cilium/cilium/pkg/datapath/loader ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
--- FAIL: Test (13.48s)
level=info msg="Using autogenerated IPv4 allocation range" subsys=node v4Prefix=10.1.0.0/16
level=info msg="Using autogenerated IPv6 allocation range" subsys=node v6Prefix="f00d::a01:0:0:0/96"
level=error msg="Link does not exist" device=cilium_net error="Link not found" subsys=datapath-loader
----------------------------------------------------------------------
FAIL: loader_test.go:165: LoaderTestSuite.TestCompileAndLoadHostEndpoint
loader_test.go:179:
s.testCompileAndLoad(c, &hostEp)
loader_test.go:154:
c.Assert(err, IsNil)
... value netlink.LinkNotFoundError = netlink.LinkNotFoundError{error:(*errors.errorString)(0xc0005a20d0)} ("Link not found")
level=info msg="Compiled new BPF template" BPFCompilationTime=1.201441695s file-path=/tmp/cilium_test1977592565/templates/66e66027ec503c0d3bd84f6df8c887e45638cf0ab81cf7d82218b48841fc471d/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=1.124382949s file-path=/tmp/cilium_test1977592565/templates/049a251dd9f895fb71a76f6349fcd7b95b39232474711e5fe7aabc4fe93e6df0/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=1.201681338s file-path=/tmp/cilium_test741519073/templates/3d74155c77be515a600048efd2bfd2db3811a6019f3fa693573f34d6a929ea22/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=1.527059091s file-path=/tmp/cilium_test741519073/templates/7938b4f4365fae566285006eb62aca0b9a0c0006909a0fb7e06c9dd0596b2c27/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=1.687688608s file-path=/tmp/cilium_test741519073/templates/c1cc079b9189e6659deb1bd51235fdb2f8833daee728422a90349bcbc6678a81/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=1.740012043s file-path=/tmp/cilium_test741519073/templates/312c7c9cd762c4d8942c6278c249dc0fe183c4c22fcca1b87a2d595d2361cb16/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=1.823694022s file-path=/tmp/cilium_test741519073/templates/3d74155c77be515a600048efd2bfd2db3811a6019f3fa693573f34d6a929ea22/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=2.284098425s file-path=/tmp/cilium_test741519073/templates/312c7c9cd762c4d8942c6278c249dc0fe183c4c22fcca1b87a2d595d2361cb16/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=2.477713267s file-path=/tmp/cilium_test741519073/templates/3d74155c77be515a600048efd2bfd2db3811a6019f3fa693573f34d6a929ea22/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=2.486516728s file-path=/tmp/cilium_test741519073/templates/34dfc680d96948579bcf46e860aa7317c10968dcc2246fe3bed80ea1b14b1596/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=2.494995266s file-path=/tmp/cilium_test741519073/templates/c1cc079b9189e6659deb1bd51235fdb2f8833daee728422a90349bcbc6678a81/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=2.693360568s file-path=/tmp/cilium_test741519073/templates/7d904e5b0e063ace19cd292a4a7b45a7a79848adaedcbfb0bcf6ba4441515500/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=2.781194192s file-path=/tmp/cilium_test741519073/templates/7938b4f4365fae566285006eb62aca0b9a0c0006909a0fb7e06c9dd0596b2c27/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=2.849800176s file-path=/tmp/cilium_test741519073/templates/b477b8a9d9f82a8fdb1243c350c35fee79757a0fa6c0aac5577225a3cef6431f/bpf_lxc.o subsys=datapath-loader
level=info msg="Compiled new BPF template" BPFCompilationTime=3.071249398s file-path=/tmp/cilium_test741519073/templates/b0130490420ac62f0608003819a40206ad48cc027c0184986c988c2477ec379a/bpf_lxc.o subsys=datapath-loader
level=info msg="Setting sysctl" subsys=sysctl sysParamName=net.ipv6.conf.dummy9.forwarding sysParamValue=1
level=info msg="Setting sysctl" subsys=sysctl sysParamName=net.ipv4.conf.dummy9.forwarding sysParamValue=1
level=info msg="Setting sysctl" subsys=sysctl sysParamName=net.ipv4.conf.dummy9.rp_filter sysParamValue=0
level=info msg="Setting sysctl" subsys=sysctl sysParamName=net.ipv4.conf.dummy9.accept_local sysParamValue=1
level=info msg="Setting sysctl" subsys=sysctl sysParamName=net.ipv4.conf.dummy9.send_redirects sysParamValue=0
OOPS: 9 passed, 1 FAILED
...