[Bug tapsets/19300] Many SystemTap tapsets failing on kernel.org 4.2.0 kernel

["fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19300

--- Comment #4 from Frank Ch. Eigler <fche at redhat dot com> ---
Interesting; the code works here on on f22 against 4.2.6.
I wonder if the problem relates to lack of kernel debuginfo.
The tapset has this construct:

function __ip_sock_daddr:long (sock:long)
        return @choose_defined(@cast(sock,
"inet_sock")->sk->__sk_common->skc_daddr, # kernel >= 2.6.38
                @choose_defined(@cast(sock, "inet_sock")->inet_daddr, 
                    @choose_defined(@cast(sock, "inet_sock")->daddr,
                        @cast(sock, "inet_sock",
"kernel<net/ip.h>")->inet->daddr)))

Note how only the last @cast() tries to generate debuginfo for
the struct type via a @cast(var, "type", "kernel<FOO.h>").  The
first three @casts don't have the header file parameter, so only
look in the vmlinux binary (if found).

My guess is that if the first three @cast's added a "kernel<BAR.h>",
it'd work even on your box, without kernel debuginfo.  One just
needs the right BAR.h.

And a good drink at said BAR.

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