Some SK_MSG related tests in ubuntu_bpf failed on i386 B-4.18

[Po-Hsu Lin]

Summary: 894 PASSED, 0 SKIPPED, 4 FAILED

Test 124, 126, 127 and 128 failed:

  #124/p invalid read past end of SK_MSG FAIL
  Unexpected error message!
   EXP: R0 !read_ok
   RES: 0: (61) r2 = *(u32 *)(r1 +60)
  invalid bpf_context access off=60 size=4

  0: (61) r2 = *(u32 *)(r1 +60)
  invalid bpf_context access off=60 size=4
  #125/p invalid read offset in SK_MSG OK
  #126/p direct packet read for SK_MSG FAIL
  Failed to load prog 'Permission denied'!
  0: (79) r2 = *(u64 *)(r1 +0)
  1: (79) r3 = *(u64 *)(r1 +4)
  invalid bpf_context access off=4 size=8
  #127/p direct packet write for SK_MSG FAIL
  Failed to load prog 'Permission denied'!
  0: (79) r2 = *(u64 *)(r1 +0)
  1: (79) r3 = *(u64 *)(r1 +4)
  invalid bpf_context access off=4 size=8
  #128/p overlapping checks for direct packet access SK_MSG FAIL
  Failed to load prog 'Permission denied'!
  0: (79) r2 = *(u64 *)(r1 +0)
  1: (79) r3 = *(u64 *)(r1 +4)
  invalid bpf_context access off=4 size=8

This issue does not exist in B-4.18 AMD64, only spotted in i386

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.18.0-12-generic 4.18.0-12.13~18.04.2
ProcVersionSignature: User Name 4.18.0-12.13~18.04.2-generic 4.18.17
Uname: Linux 4.18.0-12-generic i686
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: i386
Date: Fri Nov 30 08:25:49 2018
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)

[Connor Kuehl (connork)]

From looking at the logs, I don't think our linux-hwe (now 5.0) experiences this failure on i386.