[Bug runtime/26702] New: historical intermittent rt-linux crashes

[Bug runtime/26702] New: historical intermittent rt-linux crashes

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26702

            Bug ID: 26702
           Summary: historical intermittent rt-linux crashes
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com
  Target Milestone: ---

While numerous rt-linux tweaks to the runtime have been
made over the years, there may still be some problems.
Some problem reproducer from years ago may still cause
problems now.  Putting them here for the record.

Via <smakarov@redhat.com>:

Looked into reducing the conversions_profile.stp test case. So far I've reduced
down to

$ stap -g  --suppress-time-limits -vv -DMAXSKIPPED=99999 -DMAXERRORS=40 -e
'global hits; probe timer.profile { if (hits == 0) { hits = 1;
print(kernel_string(0xfffffff)) } }'

and

$ stap -g  --suppress-time-limits -vv -DMAXSKIPPED=99999 -DMAXERRORS=40 -e
'global hits; probe timer.profile { if (hits == 0) { hits = 1 } }'

The following works fine without crashing:

$ stap -g --suppress-time-limits -vv -DMAXSKIPPED=99999 -DMAXERRORS=40 -e
'probe timer.profile { print(kernel_string(0xfffffff)) }'

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