[Bug middle-end/69919] New: pool allocator and mem-stat race at program exit

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69919

            Bug ID: 69919
           Summary: pool allocator and mem-stat race at program exit
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

==16301== Invalid read of size 8
==16301==    at 0x843457:
mem_alloc_description<pool_usage>::release_instance_overhead(void*, unsigned
long, bool) (mem-stats.h:513)
==16301==    by 0x8427C4: base_pool_allocator<memory_block_pool>::release()
(alloc-pool.h:311)
==16301==    by 0x84299D:
base_pool_allocator<memory_block_pool>::~base_pool_allocator()
(alloc-pool.h:335)
==16301==    by 0x844E1B: object_allocator<cselib_val>::~object_allocator()
(alloc-pool.h:474)
==16301==    by 0x5E13058: __run_exit_handlers (in /lib64/libc-2.18.so)
==16301==    by 0x5E130A4: exit (in /lib64/libc-2.18.so)
==16301==    by 0x5DFCBEB: (below main) (in /lib64/libc-2.18.so)
==16301==  Address 0x72529b0 is 1,088 bytes inside a block of size 3,048 free'd
==16301==    at 0x4C28ADC: free (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==16301==    by 0x844C81: xcallocator<hash_map<void const*,
mem_usage_pair<pool_usage>, simple_hashmap_traits<default_hash_traits<void
const*>, mem_usage_pair<pool_usage> > >::hash_entry>::data_free(hash_map<void
const*, mem_usage_pair<pool_usage>,
simple_hashmap_traits<default_hash_traits<void const*>,
mem_usage_pair<pool_usage> > >::hash_entry*) (hash-table.h:273)
==16301==    by 0x14DC512: hash_table<hash_map<void const*,
mem_usage_pair<pool_usage>, simple_hashmap_traits<default_hash_traits<void
const*>, mem_usage_pair<pool_usage> > >::hash_entry,
xcallocator>::~hash_table() (hash-table.h:627)
==16301==    by 0x14DCD77: hash_map<void const*, mem_usage_pair<pool_usage>,
simple_hashmap_traits<default_hash_traits<void const*>,
mem_usage_pair<pool_usage> > >::~hash_map() (hash-map.h:26)
==16301==    by 0x14DCE52:
mem_alloc_description<pool_usage>::~mem_alloc_description() (mem-stats.h:559)
==16301==    by 0x5E13058: __run_exit_handlers (in /lib64/libc-2.18.so)
==16301==    by 0x5E130A4: exit (in /lib64/libc-2.18.so)
==16301==    by 0x5DFCBEB: (below main) (in /lib64/libc-2.18.so)