[llvm-bugs] [Bug 31923] New: SEGV when starting thread with empty body

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31923

            Bug ID: 31923
           Summary: SEGV when starting thread with empty body
           Product: clang
           Version: 3.9
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: llvm at baszerr.eu
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17962
  --> https://llvm.org/bugs/attachment.cgi?id=17962&action=edit
example reproducing issue

starting thread, with empty function/lambda body causes SEGV, when compiled
with optimizations and profiling. adding any delay when starting thread (like
sleep for a nanosecond) fixes the issue.

example code is attached. compile it with:
clang++-3.9 -std=c++11 -O1 -pg -lpthread thread.cpp

i'm observing this behavior on clang++ starting with 3.5 up to 3.9,
inclusively.

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