[Bug sanitizer/59410] Some tsan tests fail with 4GB RAM

[kcc at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59410

--- Comment #11 from Kostya Serebryany <kcc at gcc dot gnu.org> ---
> 555555554000-555555555000 r-xp 00000000 08:11 34221424                  
> /export/build/gnu/gcc-x32/build-x86_64-linux/gcc/testsuite/atomic_stack.exe

So, the executable is loaded into 555555554000, which intersects with 
tsan's shadow. 
See tsan/rtl/tsan_platform.h, around "C++ linux memory layout".
In our experience this happens when ASLR is off. 
And this is caused by the kernel patch I mentioned above. 
https://code.google.com/p/thread-sanitizer/wiki/CppManual?ts=1386348951&updated=CppManual#FAQ

We have not seen other reason for such mapping, maybe you know one :)