http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58396
--- Comment #2 from Markus Trippelsdorf <markus at trippelsdorf dot de> ---
Hopefully a better trace. gcc build with -Og. Testcase needs -O3 to trigger.
==3882== ERROR: AddressSanitizer: heap-use-after-free on address 0x600600321644
at pc 0x17d7480 bp 0x7fff6d493880 sp 0x7fff6d493878
READ of size 4 at 0x600600321644 thread T0
#0 0x17d747f in vec<loop*, va_heap, vl_embed>::length() const
/var/tmp/gcc_build_dir/gcc/../../gcc/gcc/vec.h:566
#1 0x17db2f1 in create_rdg_edges
/var/tmp/gcc_build_dir/gcc/../../gcc/gcc/tree-loop-distribution.c:385
#2 0x17e3020 in build_rdg
/var/tmp/gcc_build_dir/gcc/../../gcc/gcc/tree-loop-distribution.c:564
#3 0x17e7af0 in distribute_loop
/var/tmp/gcc_build_dir/gcc/../../gcc/gcc/tree-loop-distribution.c:1813
#4 0x17e9849 in tree_loop_distribution
/var/tmp/gcc_build_dir/gcc/../../gcc/gcc/tree-loop-distribution.c:1914
#5 0x17e9b82 in execute
/var/tmp/gcc_build_dir/gcc/../../gcc/gcc/tree-loop-distribution.c:1977
#6 0x144e83d in execute_one_pass(opt_pass*)
/var/tmp/gcc_build_dir/gcc/../../gcc/gcc/passes.c:2201
