[Bug sanitizer/58718] New: Invalid check in libsanitizer

["y.gribov at samsung dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58718

            Bug ID: 58718
           Summary: Invalid check in libsanitizer
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: y.gribov at samsung dot com
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org

Created attachment 30998
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30998&action=edit
Repro

I've recently tried to run AddressSanitizer with malloc_context_size=0 runtime
option to speedup execution of my program. I got nice perf improvements but
also an internal abort in asan_allocator2.cc when it tried to report heap
overflow warning:

 0x60040000e004 is located 4 bytes to the right of 16-byte region
[0x60040000dff0,0x60040000e000)
 ==3488== AddressSanitizer CHECK failed:
/home/ygribov/gcc/gcc-master/libsanitizer/asan/asan_allocator2.cc:216 "((id))
!= (0)" (0x0, 0x0)

If I unset ASAN_OPTIONS, warning is reported correctly.

-Y