[Bug sanitizer/55509] New: gcc.dg/torture/matrix-6.c failures with -fsanitize=address

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55509

             Bug #: 55509
           Summary: gcc.dg/torture/matrix-6.c failures with
                    -fsanitize=address
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: howarth@nitro.med.uc.edu
                CC: dodji@gcc.gnu.org, dvyukov@gcc.gnu.org,
                    jakub@gcc.gnu.org, kcc@gcc.gnu.org


Using...

make -k check-gcc RUNTESTFLAGS="--target_board=unix'{-fsanitize=address}'"

on x86_64-apple-darwin12 produces execution failures in...

FAIL: gcc.dg/torture/matrix-6.c  -O1  execution test
FAIL: gcc.dg/torture/matrix-6.c  -O2  execution test
FAIL: gcc.dg/torture/matrix-6.c  -O3 -fomit-frame-pointer  execution test
FAIL: gcc.dg/torture/matrix-6.c  -O3 -fomit-frame-pointer -funroll-loops 
execution test
FAIL: gcc.dg/torture/matrix-6.c  -O3 -fomit-frame-pointer -funroll-all-loops
-finline-functions  execution test
FAIL: gcc.dg/torture/matrix-6.c  -O3 -g  execution test
FAIL: gcc.dg/torture/matrix-6.c  -Os  execution test
FAIL: gcc.dg/torture/matrix-6.c  -O2 -flto -flto-partition=none  execution test
FAIL: gcc.dg/torture/matrix-6.c  -O2 -flto  execution test

These are of the form...

Executing on host: /sw/src/fink.build/gcc48-4.8.0-1000/darwin_objdir/gcc/xgcc
-B/sw/src/fink.build/gcc48-4.8.0-1000/darwin_objdir/gcc/
/sw/src/fink.build/gcc48-4.8.0-1000/gcc-4.8-20121127/gcc/testsuite/gcc.dg/torture/matrix-6.c
 -fno-diagnostics-show-caret   -O1  -fwhole-program  -lm   -fsanitize=address
-o ./matrix-6.exe    (timeout = 300)
PASS: gcc.dg/torture/matrix-6.c  -O1  (test for excess errors)
Setting LD_LIBRARY_PATH to
:/sw/src/fink.build/gcc48-4.8.0-1000/darwin_objdir/gcc:/sw/src/fink.build/gcc48-4.8.0-1000/darwin_objdir/x86_64-apple-darwin12.2.0/./libsanitizer/asan/.libs::/sw/src/fink.build/gcc48-4.8.0-1000/darwin_objdir/gcc:/sw/src/fink.build/gcc48-4.8.0-1000/darwin_objdir/x86_64-apple-darwin12.2.0/./libsanitizer/asan/.libs
=================================================================
==61894== ERROR: AddressSanitizer: stack-buffer-overflow on address
0x7fff54070784 at pc 0x10bb8cc7d bp 0x7fff54070730 sp 0x7fff54070728
READ of size 4 at 0x7fff54070784 thread T0
    #0 0x10bb8cc7c
(/sw/src/fink.build/gcc48-4.8.0-1000/darwin_objdir/gcc/testsuite/gcc/./matrix-6.exe+0x100000c7c)
Address 0x7fff54070784 is located at offset 36 in frame <main> of T0's stack:
  This frame has 1 object(s):
    [32, 36) 'd'
HINT: this may be a false positive if your program uses some custom stack
unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
Shadow byte and word:
  0x1fffea80e0f0: 4
  0x1fffea80e0f0: 04 f4 f4 f4 f3 f3 f3 f3
More shadow bytes:
  0x1fffea80e0d0: 00 00 00 00 00 00 00 00
  0x1fffea80e0d8: 00 00 00 00 00 00 00 00
  0x1fffea80e0e0: 00 00 00 00 00 00 00 00
  0x1fffea80e0e8: 00 00 00 00 f1 f1 f1 f1
=>0x1fffea80e0f0: 04 f4 f4 f4 f3 f3 f3 f3
  0x1fffea80e0f8: 00 00 00 00 00 00 00 00
  0x1fffea80e100: 00 00 00 00 00 00 00 00
  0x1fffea80e108: 00 00 00 00 00 00 00 00
  0x1fffea80e110: 00 00 00 00 00 00 00 00
Stats: 0M malloced (0M for red zones) by 10 calls
Stats: 0M realloced by 0 calls
Stats: 0M freed by 0 calls
Stats: 0M really freed by 0 calls

Stats: 1M (257 full pages) mmaped in 2 calls
  mmaps   by size class: 7:4095; 15:16;
  mallocs by size class: 7:9; 15:1;
  frees   by size class:
  rfrees  by size class:
Stats: malloc large: 1 small slow: 1
==61894== ABORTING
Executing on host: addr2line -f -e
/sw/src/fink.build/gcc48-4.8.0-1000/darwin_objdir/gcc/testsuite/gcc/./matrix-6.exe
0x100000c7c   (timeout = 300)
FAIL: gcc.dg/torture/matrix-6.c  -O1  execution test