extending
list1_ = 0xf15091e0
list1->slab_ = 0xf150e198
str1 = 0xf1509180
str2 = 0xf1509168
..  ints
-- before pop(0)
ints[0] = 4
ints[1] = 5
ints[2] = 6
-- after mutation
ints[0] = 42
ints[1] = 43
ints[2] = 6
list_repeat length = 3
list_repeat length = 3
item 0 1
item 1 1
.  forward iteration over list
x = 1
x = 2
x = 3
  backward iteration over list
x = 3
x = 2
x = 1
init.size() = 2
.-- before pop(0)
ints[0] = 5
ints[1] = 6
ints[2] = 7
ints[3] = 8
pop()
pop(0)
..  List<BigStr*>
  ints
....=================================================================
==3803==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xefd02e80 at pc 0xf38cc221 bp 0xffe4ef88 sp 0xffe4eb60
READ of size 60 at 0xefd02e80 thread T0
    #0 0xf38cc220 in memmove (/usr/lib32/libasan.so.5+0x2f220)
    #1 0x5dd09c73 in List<int>::pop(int) (/home/uke/oil/_bin/cxx-asan32+gcalways/mycpp/gc_list_test+0x1ac73)
    #2 0x5dd06273 in test_list_pop() (/home/uke/oil/_bin/cxx-asan32+gcalways/mycpp/gc_list_test+0x17273)
    #3 0x5dd08852 in main mycpp/gc_list_test.cc:501
    #4 0xf346db40 in __libc_start_main (/lib32/libc.so.6+0x1ab40)
    #5 0x5dcf8870 in _start (/home/uke/oil/_bin/cxx-asan32+gcalways/mycpp/gc_list_test+0x9870)

0xefd02e80 is located 0 bytes to the right of 128-byte region [0xefd02e00,0xefd02e80)
allocated by thread T0 here:
    #0 0xf39885d4 in __interceptor_malloc (/usr/lib32/libasan.so.5+0xeb5d4)
    #1 0x5dd6de2a in MarkSweepHeap::Allocate(unsigned int, int*, int*) mycpp/mark_sweep_heap.cc:106
    #2 0x5dd0ead8 in Slab<int>* NewSlab<int>(int) (/home/uke/oil/_bin/cxx-asan32+gcalways/mycpp/gc_list_test+0x1fad8)
    #3 0x5dd0cce2 in List<int>::reserve(int) (/home/uke/oil/_bin/cxx-asan32+gcalways/mycpp/gc_list_test+0x1dce2)
    #4 0x5dd098e9 in List<int>::append(int) (/home/uke/oil/_bin/cxx-asan32+gcalways/mycpp/gc_list_test+0x1a8e9)
    #5 0x5dd0625d in test_list_pop() (/home/uke/oil/_bin/cxx-asan32+gcalways/mycpp/gc_list_test+0x1725d)
    #6 0x5dd08852 in main mycpp/gc_list_test.cc:501
    #7 0xf346db40 in __libc_start_main (/lib32/libc.so.6+0x1ab40)

SUMMARY: AddressSanitizer: heap-buffer-overflow (/usr/lib32/libasan.so.5+0x2f220) in memmove
Shadow bytes around the buggy address:
  0x3dfa0580: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3dfa0590: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3dfa05a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3dfa05b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3dfa05c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x3dfa05d0:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3dfa05e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3dfa05f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3dfa0600: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3dfa0610: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3dfa0620: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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
==3803==ABORTING