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

[wcohen at redhat dot com]

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

--- Comment #3 from William Cohen <wcohen at redhat dot com> ---
Created attachment 11817
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11817&action=edit
next.stp with diagnostic prints.

ignore the previous -e example.  that isn't reproducing the problem.

It looks like changes in the values made by the kernel.function("vfs_read")
probes are not seen in the probe end. Put in the diagnostic printf in the
probes to better see what is going on.

[wcohen@localhost systemtap]$ ../install/bin/stap --bpf next.stp
BEGIN
vfs_read
value 2
status 0
end
value 2
status 2
END FAIL
[wcohen@localhost systemtap]$ ../install/bin/stap --bpf next.stp
BEGIN
vfs_read
value 0
status 0
end
value 2
status 2
END FAIL

--- Comment #4 from William Cohen <wcohen at redhat dot com> ---
Created attachment 11818
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11818&action=edit
next.stp with diagnostic prints.

ignore the previous -e example.  that isn't reproducing the problem.

It looks like changes in the values made by the kernel.function("vfs_read")
probes are not seen in the probe end. Put in the diagnostic printf in the
probes to better see what is going on.

[wcohen@localhost systemtap]$ ../install/bin/stap --bpf next.stp
BEGIN
vfs_read
value 2
status 0
end
value 2
status 2
END FAIL
[wcohen@localhost systemtap]$ ../install/bin/stap --bpf next.stp
BEGIN
vfs_read
value 0
status 0
end
value 2
status 2
END FAIL

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