test_095_kernel_symbols_missing in kernel security test failed on AWS Bionic kernel

This issue can be reproduced with 4.15.0-12-generic in -released, it will fail with "ValueError: invalid literal for int() with base 16: '(null)'"

  ======================================================================
  ERROR: test_095_kernel_symbols_missing (__main__.KernelSecurityTest)
  kernel addresses in kallsyms and modules are zeroed out
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "./test-kernel-security.py", line 1521, in test_095_kernel_symbols_missing
      self._check_pK_files(expected)
    File "./test-kernel-security.py", line 1440, in _check_pK_files
      expected)
    File "./test-kernel-security.py", line 1401, in _read_twice
      self.assertEqual(expected, 0 == int(address, 16), "%s: user saw %s" % (filename, address))
  ValueError: invalid literal for int() with base 16: '(null)'

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

With 4.15.0-13 and 4.15.0-1002.2, the error was a bit different, it will fail with: "AssertionError: /proc/self/stack: root saw 0"

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-12-generic 4.15.0-12.13
ProcVersionSignature: User Name 4.15.0-12.13-generic 4.15.7
Uname: Linux 4.15.0-12-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Mar 23 03:56 seq
 crw-rw---- 1 root audio 116, 33 Mar 23 03:56 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
CurrentDmesg:

Date: Fri Mar 23 04:14:33 2018
Ec2AMI: ami-266cf15e
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-west-2a
Ec2InstanceType: x1e.xlarge
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
JournalErrors:
 -- Logs begin at Fri 2018-03-23 03:56:35 UTC, end at Fri 2018-03-23 04:12:28 UTC. --
 Mar 23 03:56:35 username kernel: Cannot get hvm parameter CONSOLE_EVTCHN (18): -22!
 Mar 23 03:56:35 username kernel: Cannot get hvm parameter CONSOLE_EVTCHN (18): -22!
 Mar 23 03:56:56 hostname iscsid[980]: iSCSI daemon with pid=984 started!
Lsusb: Error: command ['lsusb'] failed with exit code 1:
MachineType: Xen HVM domU
PciMultimedia:

ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-12-generic root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0 nvme_core.io_timeout=255
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-12-generic N/A
 linux-backports-modules-4.15.0-12-generic N/A
 linux-firmware N/A
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/24/2006
dmi.bios.vendor: Xen
dmi.bios.version: 4.2.amazon
dmi.chassis.type: 1
dmi.chassis.vendor: Xen
dmi.modalias: dmi:bvnXen:bvr4.2.amazon:bd08/24/2006:svnXen:pnHVMdomU:pvr4.2.amazon:cvnXen:ct1:cvr:
dmi.product.name: HVM domU
dmi.product.version: 4.2.amazon
dmi.sys.vendor: Xen