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==10934==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200008a7b6 at pc 0x564cedadcfce bp 0x7fff99479b10 sp 0x7fff99479b00
READ of size 1 at 0x60200008a7b6 thread T0
    #0 0x564cedadcfcd in re_search_internal /home/ben/Programoj/nano-5.9/lib/regexec.c:764
    #1 0x564cedada955 in rpl_regexec /home/ben/Programoj/nano-5.9/lib/regexec.c:219
    #2 0x564ceda9f171 in strstrwrapper /home/ben/Programoj/nano-5.9/src/utils.c:265
    #3 0x564ceda80b35 in findnextstr /home/ben/Programoj/nano-5.9/src/search.c:207
    #4 0x564ceda82038 in go_looking /home/ben/Programoj/nano-5.9/src/search.c:425
    #5 0x564ceda81cc1 in do_research /home/ben/Programoj/nano-5.9/src/search.c:380
    #6 0x564ceda81d72 in do_findnext /home/ben/Programoj/nano-5.9/src/search.c:396
    #7 0x564ceda6bb0c in process_a_keystroke /home/ben/Programoj/nano-5.9/src/nano.c:1621
    #8 0x564ceda7176c in main /home/ben/Programoj/nano-5.9/src/nano.c:2541
    #9 0x7f56dd4d1bf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #10 0x564ceda345b9 in _start (/home/ben/Programoj/nano-5.9/src/nano+0x235b9)

0x60200008a7b6 is located 0 bytes to the right of 6-byte region [0x60200008a7b0,0x60200008a7b6)
allocated by thread T0 here:
    #0 0x7f56dddd8f30 in realloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdef30)
    #1 0x564cedababdd in re_string_realloc_buffers /home/ben/Programoj/nano-5.9/lib/regex_internal.c:168
    #2 0x564cedaba2b8 in re_string_allocate /home/ben/Programoj/nano-5.9/lib/regex_internal.c:61
    #3 0x564cedadc2f8 in re_search_internal /home/ben/Programoj/nano-5.9/lib/regexec.c:636
    #4 0x564cedada955 in rpl_regexec /home/ben/Programoj/nano-5.9/lib/regexec.c:219
    #5 0x564ceda9f171 in strstrwrapper /home/ben/Programoj/nano-5.9/src/utils.c:265
    #6 0x564ceda80b35 in findnextstr /home/ben/Programoj/nano-5.9/src/search.c:207
    #7 0x564ceda82038 in go_looking /home/ben/Programoj/nano-5.9/src/search.c:425
    #8 0x564ceda81cc1 in do_research /home/ben/Programoj/nano-5.9/src/search.c:380
    #9 0x564ceda81d72 in do_findnext /home/ben/Programoj/nano-5.9/src/search.c:396
    #10 0x564ceda6bb0c in process_a_keystroke /home/ben/Programoj/nano-5.9/src/nano.c:1621
    #11 0x564ceda7176c in main /home/ben/Programoj/nano-5.9/src/nano.c:2541
    #12 0x7f56dd4d1bf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/ben/Programoj/nano-5.9/lib/regexec.c:764 in re_search_internal
Shadow bytes around the buggy address:
  0x0c04800094a0: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
  0x0c04800094b0: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
  0x0c04800094c0: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
  0x0c04800094d0: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
  0x0c04800094e0: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
=>0x0c04800094f0: fa fa fd fa fa fa[06]fa fa fa fa fa fa fa fa fa
  0x0c0480009500: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0480009510: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0480009520: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0480009530: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0480009540: 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
==10934==ABORTING