Yep, and the commit that first fixes up these probe_read vs
probe_read_kernel/probe_read_user problems is:
6ae08ae3dea2cfa03dd3665a3c8475c2d429ef47 "bpf: Add probe_read_{user,
kernel} and probe_read_{user, kernel}_str helpers"
So, these helpers are not available until 5.5. We may consider this a
bug, but BPF code will still need to be changed to use the new helpers,
otherwise they will keep failing on s390x.
Cascardo.
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https://bugs.launchpad.net/bugs/1888507
Title:
[UBUNTU 18.04] BPF programs fail on Ubuntu s390x
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