[Bug 1809630] Re: seccomp in ubuntu_kernel_selftest failed on B s390x KVM

With Cosmic s390x KVM, 6 failures reported in our source tree and in the upstream source tree:
[ RUN ] TRACE_syscall.ptrace_syscall_dropped
TRACE_syscall.ptrace_syscall_dropped: Test failed at step #127
[ FAIL ] TRACE_syscall.ptrace_syscall_dropped
[ RUN ] TRACE_syscall.syscall_dropped
TRACE_syscall.syscall_dropped: Test failed at step #2
[ FAIL ] TRACE_syscall.syscall_dropped
[ RUN ] TRACE_syscall.skip_after_RET_TRACE
seccomp_bpf.c:1884:TRACE_syscall.skip_after_RET_TRACE:Expected -1 (18446744073709551615) == syscall(20) (728)
seccomp_bpf.c:1885:TRACE_syscall.skip_after_RET_TRACE:Expected 1 (1) == (*__errno_location ()) (0)
TRACE_syscall.skip_after_RET_TRACE: Test failed at step #12
[ FAIL ] TRACE_syscall.skip_after_RET_TRACE
[ RUN ] TRACE_syscall.kill_after_RET_TRACE
TRACE_syscall.kill_after_RET_TRACE: Test exited normally instead of by signal (code: 0)
[ FAIL ] TRACE_syscall.kill_after_RET_TRACE
[ RUN ] TRACE_syscall.skip_after_ptrace
seccomp_bpf.c:1946:TRACE_syscall.skip_after_ptrace:Expected -1 (18446744073709551615) == syscall(20) (728)
seccomp_bpf.c:1947:TRACE_syscall.skip_after_ptrace:Expected 1 (1) == (*__errno_location ()) (0)
TRACE_syscall.skip_after_ptrace: Test failed at step #15
[ FAIL ] TRACE_syscall.skip_after_ptrace
[ RUN ] TRACE_syscall.kill_after_ptrace
TRACE_syscall.kill_after_ptrace: Test exited normally instead of by signal (code: 0)
[ FAIL ] TRACE_syscall.kill_after_ptrace

With Xenail s390x KVM, the test suite is outdated and it will pass with 54 tests there. With the upstream source tree, there will be 8 failures:
[ RUN ] global.KILL_process
seccomp_bpf.c:727:global.KILL_process:Expected 0 (0) != (((signed char) ((((__extension__ (((union { __typeof(status) __in; int __i; }) { .__in = (status) }).__i))) & 0x7f) + 1) >> 1) > 0) (0)
global.KILL_process: Test terminated by assertion
[ FAIL ] global.KILL_process
[ RUN ] TRACE_syscall.ptrace_syscall_dropped
TRACE_syscall.ptrace_syscall_dropped: Test failed at step #223
[ FAIL ] TRACE_syscall.ptrace_syscall_dropped
[ RUN ] TRACE_syscall.syscall_dropped
TRACE_syscall.syscall_dropped: Test failed at step #2
[ FAIL ] TRACE_syscall.syscall_dropped
[ RUN ] TRACE_syscall.skip_after_RET_TRACE
seccomp_bpf.c:1884:TRACE_syscall.skip_after_RET_TRACE:Expected -1 (18446744073709551615) == syscall(20) (5486)
seccomp_bpf.c:1885:TRACE_syscall.skip_after_RET_TRACE:Expected 1 (1) == (*__errno_location ()) (0)
TRACE_syscall.skip_after_RET_TRACE: Test failed at step #12
[ FAIL ] TRACE_syscall.skip_after_RET_TRACE
[ RUN ] TRACE_syscall.kill_after_RET_TRACE
TRACE_syscall.kill_after_RET_TRACE: Test exited normally instead of by signal (code: 0)
[ FAIL ] TRACE_syscall.kill_after_RET_TRACE
[ RUN ] TRACE_syscall.skip_after_ptrace
seccomp_bpf.c:1946:TRACE_syscall.skip_after_ptrace:Expected -1 (18446744073709551615) == syscall(20) (5486)
seccomp_bpf.c:1947:TRACE_syscall.skip_after_ptrace:Expected 1 (1) == (*__errno_location ()) (0)
TRACE_syscall.skip_after_ptrace: Test failed at step #15
[ FAIL ] TRACE_syscall.skip_after_ptrace
[ RUN ] TRACE_syscall.kill_after_ptrace
TRACE_syscall.kill_after_ptrace: Test exited normally instead of by signal (code: 0)
[ FAIL ] TRACE_syscall.kill_after_ptrace
[ RUN ] global.get_metadata
seccomp_bpf.c:2923:global.get_metadata:Expected sizeof(md) (16) == ret (18446744073709551615)
seccomp_bpf.c:2933:global.get_metadata:Expected sizeof(md) (16) == ret (18446744073709551615)
seccomp_bpf.c:2934:global.get_metadata:Expected md.flags (2) == 0 (0)
global.get_metadata: Test failed at step #6
[ FAIL ] global.get_metadata


** Summary changed:

- seccomp in ubuntu_kernel_selftest failed on B s390x KVM
+ seccomp in ubuntu_kernel_selftest failed on X/B/C s390x KVM

** Tags added: cosmic xenial

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https://bugs.launchpad.net/bugs/1809630

Title:
seccomp in ubuntu_kernel_selftest failed on X/B/C s390x KVM

Status in ubuntu-kernel-tests:
New
Status in linux package in Ubuntu:
Incomplete

Bug description:
There are 7 test cases failed in secomp_bpf test, and this can be
reproduced with test suites from the upstream:

[ RUN ] TRACE_syscall.ptrace_syscall_dropped
TRACE_syscall.ptrace_syscall_dropped: Test failed at step #159
[ FAIL ] TRACE_syscall.ptrace_syscall_dropped

[ RUN ] TRACE_syscall.syscall_dropped
TRACE_syscall.syscall_dropped: Test failed at step #2
[ FAIL ] TRACE_syscall.syscall_dropped

[ RUN ] TRACE_syscall.skip_after_RET_TRACE
seccomp_bpf.c:1884:TRACE_syscall.skip_after_RET_TRACE:Expected -1 (18446744073709551615) == syscall(20) (14184)
seccomp_bpf.c:1885:TRACE_syscall.skip_after_RET_TRACE:Expected 1 (1) == (*__errno_location ()) (0)
TRACE_syscall.skip_after_RET_TRACE: Test failed at step #12
[ FAIL ] TRACE_syscall.skip_after_RET_TRACE

[ RUN ] TRACE_syscall.kill_after_RET_TRACE
TRACE_syscall.kill_after_RET_TRACE: Test exited normally instead of by signal (code: 0)
[ FAIL ] TRACE_syscall.kill_after_RET_TRACE

[ RUN ] TRACE_syscall.skip_after_ptrace
seccomp_bpf.c:1946:TRACE_syscall.skip_after_ptrace:Expected -1 (18446744073709551615) == syscall(20) (14184)
seccomp_bpf.c:1947:TRACE_syscall.skip_after_ptrace:Expected 1 (1) == (*__errno_location ()) (0)
TRACE_syscall.skip_after_ptrace: Test failed at step #15
[ FAIL ] TRACE_syscall.skip_after_ptrace

[ RUN ] TRACE_syscall.kill_after_ptrace
TRACE_syscall.kill_after_ptrace: Test exited normally instead of by signal (code: 0)
[ FAIL ] TRACE_syscall.kill_after_ptrace


[ RUN ] global.get_metadata
seccomp_bpf.c:2913:global.get_metadata:Expected sizeof(md) (16) == ptrace(0x420d, pid, sizeof(md), &md) (18446744073709551615)
global.get_metadata: Test terminated by assertion
[ FAIL ] global.get_metadata


Please find the complete test report here:
https://pastebin.ubuntu.com/p/tfmVypShtX/

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-43-generic 4.15.0-43.46
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic s390x
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: s390x
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Date: Mon Dec 24 03:33:04 2018
HibernationDevice: RESUME=UUID=caaee9b2-6bc1-4c8e-b26c-69038c092091
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lspci:

Lsusb: Error: command ['lsusb'] failed with exit code 1:
PciMultimedia:

ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
ProcKernelCmdLine: root=UUID=c7d7bbcb-a039-4ead-abfe-7672dea0add4 crashkernel=196M
RelatedPackageVersions:
linux-restricted-modules-4.15.0-43-generic N/A
linux-backports-modules-4.15.0-43-generic N/A
linux-firmware 1.173.3
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)

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