So, s390x ptrace does allow to set the syscall and return code as long
as it sets the return code at exit time.
However, when using seccomp SECCOMP_RET_TRACE, there is no possibility
to change it at exit time (by doing a ptrace after SECCOMP_RET_TRACE
stops the process). It only happens at entry
01:54:40 ERROR| [stderr]
seccomp_bpf.c:1902:TRACE_syscall.syscall_faked:Expected 45000 (45000) ==
syscall(236) (18446744073709551615)
01:54:40 ERROR| [stderr] TRACE_syscall.syscall_faked: Test failed at step #11
This fails after the fix for LP: #1895132. However, this is not a
regression. s390x
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