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[Bug bpf/24639] "next" statement not recognized by stap bpf backend


https://sourceware.org/bugzilla/show_bug.cgi?id=24639

--- Comment #6 from William Cohen <wcohen at redhat dot com> ---
Due to the crashes with bpf on f30 fedora 5.1.x kernels. This was on a rawhide
machine:

$ uname -a
Linux localhost.localdomain 5.2.0-0.rc3.git0.1.fc31.x86_64 #1 SMP Mon Jun 3
13:27:29 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux


However, got same failure on f29:

$ uname -a
Linux fedora29 5.0.19-200.fc29.x86_64 #1 SMP Tue May 28 13:56:29 UTC 2019
x86_64 x86_64 x86_64 GNU/Linux
$ sudo ../install/bin/stap --bpf next.stp
BEGIN
vfs_read
value 2
status 0
end
value 2
status 2
END FAIL

Maybe there is some change in the kernel that is allowing for incoherent values
between kernel and user space.

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