spurious crash in pathfinding

[Windfisch]

Only occurs sometimes, not really reproducible. Addresses did not resolve to source code lines.

Scheduler::recalculate()
=================================================================
==2832==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7ffdb4e53b58 at pc 0x563ae0c41ea5 bp 0x7ffdb4e52ff0 sp 0x7ffdb4e52fe8
READ of size 8 at 0x7ffdb4e53b58 thread T0
    #0 0x563ae0c41ea4  (/home/flo/factorio-bot/bot+0x86fea4)
    #1 0x563ae0c487d1  (/home/flo/factorio-bot/bot+0x8767d1)
    #2 0x563ae0c3b598  (/home/flo/factorio-bot/bot+0x869598)
    #3 0x563ae0c36c56  (/home/flo/factorio-bot/bot+0x864c56)
    #4 0x563ae0c3611d  (/home/flo/factorio-bot/bot+0x86411d)
    #5 0x563ae0dd380b  (/home/flo/factorio-bot/bot+0xa0180b)
    #6 0x563ae0dad69c  (/home/flo/factorio-bot/bot+0x9db69c)
    #7 0x563ae0d99d99  (/home/flo/factorio-bot/bot+0x9c7d99)
    #8 0x563ae0d97d4a  (/home/flo/factorio-bot/bot+0x9c5d4a)
    #9 0x563ae0f172df  (/home/flo/factorio-bot/bot+0xb452df)
    #10 0x7f440e62f222  (/usr/lib/libc.so.6+0x24222)
    #11 0x563ae09facbd  (/home/flo/factorio-bot/bot+0x628cbd)

Address 0x7ffdb4e53b58 is located in stack of thread T0 at offset 888 in frame
    #0 0x563ae0c3626f  (/home/flo/factorio-bot/bot+0x86426f)

  This frame has 38 object(s):
    [32, 40) 'point.i'
    [64, 72) 'ref.tmp8.i'
    [96, 480) 'log' (line 88)
    [544, 576) 'ref.tmp' (line 88)
    [608, 609) 'ref.tmp1' (line 88)
    [624, 640) 'view_area' (line 94)
    [656, 760) 'view' (line 97)
    [800, 808) 'ref.tmp43' (line 97)
    [832, 872) 'openlist' (line 102) <== Memory access at offset 888 overflows this variable
    [912, 913) 'ref.tmp56' (line 102) <== Memory access at offset 888 underflows this variable
    [928, 984) 'needs_cleanup' (line 104)
    [1024, 1040) 'ref.tmp69' (line 106)
    [1056, 1064) 'ref.tmp94' (line 107)
    [1088, 1104) 'current' (line 112)
    [1120, 1136) 'agg.tmp125'
    [1152, 1168) 'agg.tmp135'
    [1184, 1192) 'p' (line 123)
    [1216, 1256) 'agg.tmp176'
    [1296, 1336) 'agg.tmp179'
    [1376, 1416) '__begin3' (line 136)
    [1456, 1496) '__end3' (line 136)
    [1536, 1544) 'pos197' (line 136)
    [1568, 1600) 'ref.tmp205' (line 136)
    [1632, 1696) 'steps' (line 147)
    [1728, 1736) 'successor' (line 152)
    [1760, 1768) 'ref.tmp625' (line 184)
    [1792, 1800) 'ref.tmp646' (line 187)
    [1824, 1840) 'ref.tmp647' (line 187)
    [1856, 1864) 'ref.tmp675' (line 191)
    [1888, 1904) 'ref.tmp690' (line 193)
    [1920, 1936) 'ref.tmp706' (line 197)
    [1952, 1960) 'ref.tmp725' (line 198)
    [1984, 2024) '__begin1' (line 206)
    [2064, 2104) '__end1' (line 206)
    [2144, 2152) 'ref.tmp784' (line 208)
    [2176, 2184) 'ref.tmp838' (line 213)
    [2208, 2216) 'ref.tmp841' (line 213)
    [2240, 2256) 'ref.tmp842' (line 213)
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-overflow (/home/flo/factorio-bot/bot+0x86fea4) 
Shadow bytes around the buggy address:
  0x1000369c2710: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000369c2720: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000369c2730: 00 00 00 00 00 00 00 00 f2 f2 f2 f2 f2 f2 f2 f2
  0x1000369c2740: f8 f8 f8 f8 f2 f2 f2 f2 f8 f2 00 00 f2 f2 00 00
  0x1000369c2750: 00 00 00 00 00 00 00 00 00 00 00 f2 f2 f2 f2 f2
=>0x1000369c2760: f8 f2 f2 f2 00 00 00 00 00 f2 f2[f2]f2 f2 f8 f2
  0x1000369c2770: 00 00 00 00 00 00 00 f2 f2 f2 f2 f2 f8 f8 f2 f2
  0x1000369c2780: f8 f2 f2 f2 00 00 f2 f2 00 00 f2 f2 00 00 f2 f2
  0x1000369c2790: f8 f2 f2 f2 00 00 00 00 00 f2 f2 f2 f2 f2 00 00
  0x1000369c27a0: 00 00 00 f2 f2 f2 f2 f2 f8 f8 f8 f8 f8 f2 f2 f2
  0x1000369c27b0: f2 f2 f8 f8 f8 f8 f8 f2 f2 f2 f2 f2 f8 f2 f2 f2
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
==2832==ABORTING