usertap kernel read faults - can I ignore them somehow?

[Frank Ch. Eigler]

Hi, Matthew -

> I'm having an issue with our usertap tapset
> (https://github.com/fubralimited/usertap) [...]
> ERROR: kernel read fault at 0x0000000100000264 (addr) near identifier
> '@cast' at /usr/share/systemtap/tapset/ip.stp:45:11

You can do several things.
First, you can run "stap --skip-badvars ...", which turns all erroneous
$var accesses into 0.  Second, you can (sometimes) wrap expressions with
   try { var = $var } catch { } 
to absorb the error.  But see <http://sourceware.org/PR13306>.

- FChE