==135254==ERROR: AddressSanitizer: stack-buffer-underflow on address 0x7ffcceaeb420 at pc 0x0000006551d6 bp 0x7ffcceaeb3e0 sp 0x7ffcceaeb3d0
WRITE of size 8 at 0x7ffcceaeb420 thread T0
    #0 0x6551d5 in aliaslist_free alias/alias.c:694
    #1 0x497bac in mutt_index_menu /home/mutt/work/alias/index.c:3297
    #2 0x4b8c08 in main /home/mutt/work/alias/main.c:1195
    #3 0x7feeabdaf041 in __libc_start_main ../csu/libc-start.c:308
    #4 0x4074ad in _start (/home/mutt/work/alias/neomutt+0x4074ad)

Address 0x7ffcceaeb420 is located in stack of thread T0 at offset 16 in frame
    #0 0x654f50 in aliaslist_free alias/alias.c:690

  This frame has 1 object(s):
    [32, 40) 'np' (line 691) <== Memory access at offset 16 underflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-underflow alias/alias.c:694 in aliaslist_free
Shadow bytes around the buggy address:
  0x100019d55630: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100019d55640: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100019d55650: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100019d55660: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100019d55670: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x100019d55680: 00 00 f1 f1[f1]f1 00 f3 f3 f3 00 00 00 00 00 00
  0x100019d55690: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100019d556a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100019d556b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100019d556c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100019d556d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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
  Shadow gap:              cc
==135254==ABORTING