[Bug runtime/22031] New: failure in pthread_stacks.exp

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

https://sourceware.org/bugzilla/show_bug.cgi?id=22031

            Bug ID: 22031
           Summary: failure in pthread_stacks.exp
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com
  Target Milestone: ---

The systemtap.base/pthread_stacks.exp test case (which runs the
process/threadstacks.stp example) is getting a new failure since the bpf merge:

    FAIL: pthread_stacks -Gsize (1 0)

This failure is consistent on 4.12.5-300.fc26.i686+PAE, 2.6.32-696.el6.x86_64
and 3.10.0-693.el7.ppc64le. If you look at the systemtap.log file, you'll see
this (this example is from 3.10.0-693.el7.ppc64le):

====
ERROR: read fault [man error::fault] at 0x344b8 near identifier
'$__default_pthread_attr' at
/root/src.copy/testsuite/systemtap.examples/process/threadstacks.stp:24:11
====

That address doesn't look reasonable.

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