ld_abs+vlan_push/pop from test_bpf in ubuntu_bpf_jit will fail on X s390x

Bug #1868243 reported by Po-Hsu Lin on 2020-03-20
14
This bug affects 2 people
Affects Status Importance Assigned to Milestone
ubuntu-kernel-tests
Undecided
Unassigned
linux (Ubuntu)
Undecided
Unassigned
Xenial
Undecided
Unassigned

Bug Description

Issue separated from bug 1768452
The ubuntu_bpf_jit will report the following failure on Xenial s390x:
  * test_bpf: #250 BPF_MAXINSNS: ld_abs+vlan_push/pop FAIL to select_runtime err=-524

This test has been moved to the test_verifier test in bpf of kselftests:
https://github.com/torvalds/linux/commit/93731ef086cee90af594e62874bb98ae6d6eee91

"Remove all eBPF tests involving LD_ABS/LD_IND from test_bpf.ko. Reason
is that the eBPF tests from test_bpf module do not go via BPF verifier
and therefore any instruction rewrites from verifier cannot take place.

Therefore, move them into test_verifier which runs out of user space,
so that verfier can rewrite LD_ABS/LD_IND internally in upcoming patches.
It will have the same effect since runtime tests are also performed from
there. This also allows to finally unexport bpf_skb_vlan_{push,pop}_proto
and keep it internal to core kernel."

Po-Hsu Lin (cypressyew) on 2020-03-20
tags: added: 4.4 s390x sru-20200316 ubuntu-bpf-jit
tags: added: sru-20200106 sru-20200217
tags: added: xenial
Po-Hsu Lin (cypressyew) on 2020-03-20
description: updated

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1868243

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
Changed in linux (Ubuntu Xenial):
status: New → Incomplete
Po-Hsu Lin (cypressyew) on 2020-05-05
tags: added: sru-20200427

This is also affecting the net test in ubuntu_kernel_selftests on s390x,
as it will try to insert that module for the test. (test_bpf.sh)

tags: added: sru-20200629 sru-20200720
tags: added: ubuntu-kernel-selftests
summary: - ld_abs+vlan_push/pop from ubuntu_bpf_jit will fail on X s390x
+ ld_abs+vlan_push/pop from test_bpf in ubuntu_bpf_jit will fail on X
+ s390x
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