ASan errors about argtable3 HOT 6 CLOSED

$ git log -1
commit d1f6cdef8b9f8dba885ef612cba35251e13e5089 (HEAD -> master, origin/master, origin/HEAD)
Author: Tom G. Huang <[email protected]>
Date:   Mon May 18 14:57:55 2020 -0700

    chore: Add variable to control arg_rex debug output
$ mkdir build
$ cd build
$ CFLAGS="-g -fsanitize=address" CXXFLAGS="-g -fsanitize=address" cmake ..
-- The C compiler identification is GNU 7.5.0
-- The CXX compiler identification is GNU 7.5.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/tmp.zDPAQ7i9CN/argtable3/build
$ make
...
$ CTEST_OUTPUT_ON_FAILURE=1 make test
Running tests...
Test project /tmp/tmp.zDPAQ7i9CN/argtable3/build
    Start 1: test_shared
1/4 Test #1: test_shared ......................   Passed    4.74 sec
    Start 2: test_static
2/4 Test #2: test_static ......................   Passed    4.72 sec
    Start 3: test_src
3/4 Test #3: test_src .........................   Passed    4.73 sec
    Start 4: test_amalgamation
4/4 Test #4: test_amalgamation ................***Failed    0.03 sec
=================================================================
==4548==ERROR: AddressSanitizer: global-buffer-overflow on address 0x556b93c07e44 at pc 0x556b93bf0d15 bp 0x7ffe55ae6350 sp 0x7ffe55ae6340
READ of size 1 at 0x556b93c07e44 thread T0
    #0 0x556b93bf0d14 in arg_extension /tmp/tmp.zDPAQ7i9CN/argtable3/dist/argtable3.c:2782
    #1 0x556b93bf1013 in arg_file_scanfn /tmp/tmp.zDPAQ7i9CN/argtable3/dist/argtable3.c:2803
    #2 0x556b93bfc752 in arg_parse_untagged /tmp/tmp.zDPAQ7i9CN/argtable3/dist/argtable3.c:5149
    #3 0x556b93bfce4e in arg_parse /tmp/tmp.zDPAQ7i9CN/argtable3/dist/argtable3.c:5251
    #4 0x556b93bd71d3 in test_argfile_basic_008 /tmp/tmp.zDPAQ7i9CN/argtable3/tests/testargfile.c:198
    #5 0x556b93be495f in CuTestRun /tmp/tmp.zDPAQ7i9CN/argtable3/tests/CuTest.c:144
    #6 0x556b93be59aa in CuSuiteRun /tmp/tmp.zDPAQ7i9CN/argtable3/tests/CuTest.c:283
    #7 0x556b93b96147 in RunAllTests /tmp/tmp.zDPAQ7i9CN/argtable3/tests/testall.c:66
    #8 0x556b93b9620a in main /tmp/tmp.zDPAQ7i9CN/argtable3/tests/testall.c:79
    #9 0x7f84cdcf4b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #10 0x556b93b95f29 in _start (/tmp/tmp.zDPAQ7i9CN/argtable3/build/tests/test_amalgamation+0x12f29)

0x556b93c07e44 is located 60 bytes to the left of global variable '*.LC15' defined in '/tmp/tmp.zDPAQ7i9CN/argtable3/tests/testargfile.c' (0x556b93c07e80) of size 1
  '*.LC15' is ascii string ''
0x556b93c07e44 is located 0 bytes to the right of global variable '*.LC14' defined in '/tmp/tmp.zDPAQ7i9CN/argtable3/tests/testargfile.c' (0x556b93c07e40) of size 4
  '*.LC14' is ascii string 'foo'
SUMMARY: AddressSanitizer: global-buffer-overflow /tmp/tmp.zDPAQ7i9CN/argtable3/dist/argtable3.c:2782 in arg_extension
Shadow bytes around the buggy address:
  0x0aadf2778f70: f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 00 06 f9 f9
  0x0aadf2778f80: f9 f9 f9 f9 00 00 00 00 00 00 02 f9 f9 f9 f9 f9
  0x0aadf2778f90: 05 f9 f9 f9 f9 f9 f9 f9 00 01 f9 f9 f9 f9 f9 f9
  0x0aadf2778fa0: 00 02 f9 f9 f9 f9 f9 f9 00 04 f9 f9 f9 f9 f9 f9
  0x0aadf2778fb0: 00 06 f9 f9 f9 f9 f9 f9 00 03 f9 f9 f9 f9 f9 f9
=>0x0aadf2778fc0: 00 06 f9 f9 f9 f9 f9 f9[04]f9 f9 f9 f9 f9 f9 f9
  0x0aadf2778fd0: 01 f9 f9 f9 f9 f9 f9 f9 05 f9 f9 f9 f9 f9 f9 f9
  0x0aadf2778fe0: 06 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9
  0x0aadf2778ff0: 00 02 f9 f9 f9 f9 f9 f9 07 f9 f9 f9 f9 f9 f9 f9
  0x0aadf2779000: 00 02 f9 f9 f9 f9 f9 f9 05 f9 f9 f9 f9 f9 f9 f9
  0x0aadf2779010: 06 f9 f9 f9 f9 f9 f9 f9 07 f9 f9 f9 f9 f9 f9 f9
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
==4548==ABORTING


75% tests passed, 1 tests failed out of 4

Total Test time (real) =  14.24 sec

The following tests FAILED:
          4 - test_amalgamation (Failed)
Errors while running CTest
Makefile:85: recipe for target 'test' failed
make: *** [test] Error 8