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From: "bernd.edlinger at hotmail dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/64265] [5 Regression] r217669 broke tsan
Date: Fri, 12 Dec 2014 20:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64265

--- Comment #19 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
oh, I see now, in tsan/tsan_rtl.cc

  // Shadow stack maintenance can be replaced with
  // stack unwinding during trace switch (which presumably must be faster).
  DCHECK_GE(thr->shadow_stack_pos, thr->shadow_stack);
#ifndef TSAN_GO
  DCHECK_LT(thr->shadow_stack_pos, thr->shadow_stack_end);
#else
  if (thr->shadow_stack_pos == thr->shadow_stack_end)
    GrowShadowStack(thr);
#endif
  thr->shadow_stack_pos[0] = pc;
  thr->shadow_stack_pos++;

I usually build all languages, inclusive go, just for curiosity.
And maybe that defines TSAN_GO ?