[Bug sanitizer/84340] New: [8 regression] g++.dg/asan/use-after-scope-types-1.C (and others) fails after r257585

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84340

            Bug ID: 84340
           Summary: [8 regression] g++.dg/asan/use-after-scope-types-1.C
                    (and others) fails after r257585
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
                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, marxin at gcc dot gnu.org
  Target Milestone: ---

I saw this on powerpc64 both le and be

FAIL: g++.dg/asan/use-after-scope-types-1.C   -O1  execution test
FAIL: g++.dg/asan/use-after-scope-types-1.C   -O2  execution test
FAIL: g++.dg/asan/use-after-scope-types-1.C   -O2 -flto -fno-use-linker-plugin
-flto-partition=none  execution test
FAIL: g++.dg/asan/use-after-scope-types-1.C   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  execution test
FAIL: g++.dg/asan/use-after-scope-types-1.C   -O3 -g  execution test
FAIL: g++.dg/asan/use-after-scope-types-1.C   -Os  execution test
FAIL: g++.dg/asan/use-after-scope-types-2.C   -O1  execution test
FAIL: g++.dg/asan/use-after-scope-types-2.C   -O2  execution test
FAIL: g++.dg/asan/use-after-scope-types-2.C   -O2 -flto -fno-use-linker-plugin
-flto-partition=none  execution test
FAIL: g++.dg/asan/use-after-scope-types-2.C   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  execution test
FAIL: g++.dg/asan/use-after-scope-types-2.C   -O3 -g  execution test
FAIL: g++.dg/asan/use-after-scope-types-2.C   -Os  execution test
FAIL: g++.dg/asan/use-after-scope-types-3.C   -O1  execution test
FAIL: g++.dg/asan/use-after-scope-types-3.C   -O2  execution test
FAIL: g++.dg/asan/use-after-scope-types-3.C   -O2 -flto -fno-use-linker-plugin
-flto-partition=none  execution test
FAIL: g++.dg/asan/use-after-scope-types-3.C   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  execution test
FAIL: g++.dg/asan/use-after-scope-types-3.C   -O3 -g  execution test
FAIL: g++.dg/asan/use-after-scope-types-3.C   -Os  execution test
FAIL: g++.dg/asan/use-after-scope-types-5.C   -O1  execution test
FAIL: g++.dg/asan/use-after-scope-types-5.C   -O2  execution test
FAIL: g++.dg/asan/use-after-scope-types-5.C   -O2 -flto -fno-use-linker-plugin
-flto-partition=none  execution test
FAIL: g++.dg/asan/use-after-scope-types-5.C   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  execution test
FAIL: g++.dg/asan/use-after-scope-types-5.C   -O3 -g  execution test
FAIL: g++.dg/asan/use-after-scope-types-5.C   -Os  execution test

The failures all appear to be something like this:

=================================================================
==53100==ERROR: AddressSanitizer: stack-use-after-scope on address
0x3fffe6d3c880 at pc 0x00001000103c bp 0x3fffe6d3c7c0 sp 0x3fffe6d3c7e0
WRITE of size 1 at 0x3fffe6d3c880 thread T0
    #0 0x10001038 in Ptr<bool>::Access()
/home/seurer/gcc/gcc-trunk/gcc/testsuite/g++.dg/asan/use-after-scope-types.h:8
    #1 0x10000e6c in void test<bool>()
/home/seurer/gcc/gcc-trunk/gcc/testsuite/g++.dg/asan/use-after-scope-types.h:29
    #2 0x10000c74 in main
/home/seurer/gcc/gcc-trunk/gcc/testsuite/g++.dg/asan/use-after-scope-types-1.C:10
    #3 0x3fffb38d3098  (/lib/powerpc64le-linux-gnu/libc.so.6+0x23098)

Address 0x3fffe6d3c880 is located in stack of thread T0 at offset 32 in frame
    #0 0x10000d60 in void test<bool>()
/home/seurer/gcc/gcc-trunk/gcc/testsuite/g++.dg/asan/use-after-scope-types.h:22

  This frame has 2 object(s):
    [32, 33) 'x' <== Memory access at offset 32 is inside this variable
    [96, 104) 'ptr'
HINT: this may be a false positive if your program uses some custom stack
unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-use-after-scope
/home/seurer/gcc/gcc-trunk/gcc/testsuite/g++.dg/asan/use-after-scope-types.h:8
in Ptr<bool>::Access()
Shadow bytes around the buggy address:
  0x09fffcda78c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x09fffcda78d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x09fffcda78e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x09fffcda78f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x09fffcda7900: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
=>0x09fffcda7910:[f8]f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f3 f3 f3 f3
  0x09fffcda7920: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x09fffcda7930: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x09fffcda7940: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x09fffcda7950: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x09fffcda7960: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==53100==ABORTING