[Bug sanitizer/111736] Address sanitizer is not compatible with named address spaces

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111736

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |---
             Status|RESOLVED                    |REOPENED

--- Comment #10 from Uroš Bizjak <ubizjak at gmail dot com> ---
Huh, is this really fixed?

--cut here--
extern int __seg_gs m;

int foo (void)
{
  return m;
}

extern __thread int n;

int bar (void)
{
  return n;
}

extern int o;

int baz (void)
{
  return o;
}
--cut here--

gcc -O2 -fsanitize=address:


foo:
.LASANPC0:
.LFB0:
        .cfi_startproc
        movl    $m, %eax
        movq    %rax, %rdx
        andl    $7, %eax
        shrq    $3, %rdx
        addl    $3, %eax
        movzbl  2147450880(%rdx), %edx
        cmpb    %dl, %al
        jl      .L2
        testb   %dl, %dl
        jne     .L13
.L2:
        movl    %gs:m(%rip), %eax
        ret
.L13:
        pushq   %rax
        .cfi_def_cfa_offset 16
        movl    $m, %edi
        call    __asan_report_load4
        .cfi_endproc
.LFE0:
        .size   foo, .-foo
        .p2align 4
        .globl  bar
        .type   bar, @function

The memory access is still annotated with asan code.

I did test patched gcc by building a kernel with named address spaces, but I'm
not sure I did it correctly anymore - I was not able to boot recent -tip with
KASAN and enabled named address spaces.