http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55341
--- Comment #16 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch>
2012-12-19 08:17:15 UTC ---
After testing on CP2K, I believe that ASAN yields a false positive (current
trunk). It is obviously hard to be sure, but the indications are
First, the code and testcase runs without error with valgrind (when compiled
without -fsanitize=address).
Second, the error happens after the last statement in the subroutine and is of
'unknown' type
Third, the invalid write has size 1, which is a very unusual length in Fortran,
as almost no data types have that length.
While I can provide build instructions for CP2K (and the sources are public of
course), I can't reduce this to a small runtime testcase. Is it sufficient to
upload the object/disassembly for the involved subroutine for this to be
investigated ?
I can copy and paste commands in gdb if you have suggestions...
Meanwhile, the error message reads:
==49256== ERROR: AddressSanitizer: unknown-crash on address 0x1ffff6742e2c at
pc 0x7ff6d8e6e11d bp 0x7fffb3a16b80 sp 0x7fffb3a16b58
WRITE of size 1 at 0x1ffff6742e2c thread T0
#0 0x7ff6d8e6e11c in __interceptor_memset _asan_rtl_
#1 0x1c93a5f in __qs_environment_MOD_qs_init
/data/vjoost/gnu/cp2k/cp2k/src/../src/qs_environment.F:210
#2 0xe4f
Address 0x1ffff6742e2c is located in the high shadow area.
Stats: 415M malloced (231M for red zones) by 484132 calls
Stats: 0M realloced by 0 calls
Stats: 282M freed by 427077 calls
Stats: 264M really freed by 150081 calls
Stats: 418M (107040 full pages) mmaped in 357 calls
mmaps by size class: 7:294840; 8:24564; 9:22506; 10:9198; 11:18615;
12:6656; 13:5632; 14:96; 15:16; 16:8; 18:2; 21:7; 23:1; 24:2; 25:2; 26:2;
mallocs by size class: 7:335835; 8:33268; 9:33156; 10:17186; 11:24103;
12:20433; 13:19971; 14:147; 15:11; 16:5; 18:2; 21:7; 23:1; 24:2; 25:3; 26:2;
frees by size class: 7:320047; 8:18657; 9:20241; 10:16584; 11:11547;
12:19913; 13:19948; 14:124; 15:2; 16:5; 21:6; 23:1; 25:1; 26:1;
rfrees by size class: 7:43981; 8:18546; 9:20241; 10:16454; 11:11497;
12:19531; 13:19693; 14:124; 15:2; 16:4; 21:6; 25:1; 26:1;
Stats: malloc large: 33 small slow: 11758
==49256== ABORTING
