[Bug 192686] New: Segfaults using combinations of -pie -pthread -lm(|_p) when profiling

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192686

            Bug ID: 192686
           Summary: Segfaults using combinations of -pie -pthread -lm(|_p)
                    when profiling
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: i386
                OS: Any
            Status: Needs Triage
          Severity: Affects Many People
          Priority: ---
         Component: threads
          Assignee: freebsd-threads at FreeBSD.org
          Reporter: riggs at FreeBSD.org

Created attachment 145830
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=145830&action=edit
Demo code for bug

Combinations of -pie, -lm(|_p) and -pthread compile successfully but then
segfault. Using attached demo code I get this on FreeBSD 11.0-CURRENT #0
r268981:

[1]> clang -pg -pie -pthread -lm profile.c && ./a.out
Segmentation fault (core dumped)

[2]> clang -pg -pie -pthread -lm_p profile.c && ./a.out
Segmentation fault (core dumped)

[3]> clang -pg -pthread -lm profile.c && ./a.out
Segmentation fault (core dumped)

[4]> clang -pg -pthread -lm_p profile.c && ./a.out
[SUCCESS]

[5]> clang -pg -pthread -lm profile.c && ./a.out
Segmentation fault (core dumped)

[6]> clang -pg -pie -pthread  profile.c && ./a.out 
Segmentation fault (core dumped)


At least 2,4,6 are supposed to work, if not all.
On 10-STABLE, e.g. 3+4 work as expected.

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