[Bug 1879752] Re: test_bpf of ubuntu_kernel_selftests.net ADT test failure with linux 4.4.0-180.210

** Changed in: ubuntu-kernel-tests
Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1879752

Title:
test_bpf of ubuntu_kernel_selftests.net ADT test failure with linux
4.4.0-180.210

Status in ubuntu-kernel-tests:
Fix Released
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Xenial:
Fix Committed

Bug description:
[Impact]
Testcase test_bpf of ubuntu_kernel_selftests.net regressed on xenial/linux 4.4.0-180.210.

What the test_bpf testcase does is only loading the test_bpf module,
which reports the following error:

May 20 16:57:21 autopkgtest kernel: [ 88.143826] test_bpf: #250 BPF_MAXINSNS: ld_abs+vlan_push/pop
jited:1 ret -12 != 3055 FAIL (1 times)

This is cased by upstream commit 636c2628086e "net: skbuff: Remove
errornous length validation in skb_vlan_pop()" which we applied from
stable upstream v4.4.223.

[Fix]
The fix is upstream commit 0d906b1e8d40 "bpf, test: fix ld_abs + vlan push/pop stress test" from v4.9 which can cherry-picked to xenial.

[Test case]
Load the test_bpf module, it should return no errors.

[Regression potential]
Low. The fix changes only a bpf test module and was tested to fix the reported issue.


Original bug report:
---------
Testing failed on:
    amd64: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/amd64/l/linux/20200520_161352_2051b@/log.gz
    i386: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/i386/l/linux/20200520_160450_cdd7c@/log.gz
    ppc64el: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/ppc64el/l/linux/20200520_152728_5aa07@/log.gz
    s390x: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/s390x/l/linux/20200520_151052_5aa07@/log.gz

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