[Bug runtime/13377] New: s390x argument access is broken for any argument > 5 (_stp_arg)

[mjw at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13377

             Bug #: 13377
           Summary: s390x argument access is broken for any argument > 5
                    (_stp_arg)
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: mjw@redhat.com
    Classification: Unclassified


See _stp_arg in tapset/s390/registers.stp:

 * We don't yet support extracting arg #6 and beyond, which are passed
 * on stack

        if (argnum < 1 || argnum > 5) {
                error(sprintf("Cannot access arg(%d)", argnum))
                return 0
        }

This causes random FAILs for a lot of the syscall.exp test cases, since they do
a wide syscall.* probe with argstr printing which will occasionally hit the
above and ERROR out.

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