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

[hjl.tools at gmail dot com]

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

--- Comment #18 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Kostya Serebryany from comment #16)
> > Kernel is free to load PIE at ANY address it wants.  But
> > you can specify where to load PIE via a linker switch
> > 
> > -Ttext-segment 0x855555000000
> > 
> > to tell kernel to load PIE to a specific address.
> 
> Hm. Interesting. What do I do wrong? 
> % clang++ simple_race.cc -fsanitize=thread -Wl,-Ttext-segment=0x7d0000000000
> ;  (setarch x86_64 -R ./a.out )
> FATAL: ThreadSanitizer can not mmap the shadow memory (something is mapped
> at 0x555555554000 < 0x7cf000000000)
> FATAL: Make sure to compile with -fPIE and to link with -pie.

Please show the output of

# readelf -lW a.out