also another backtrace and memory dump for the other grep command 'grep -wf A'
=================================================================
==114878==ERROR: AddressSanitizer: global-buffer-overflow on address
0x55555555a022 at pc 0x555555557621 bp 0x7fffffffd9f0 sp
0x7fffffffd9e0
READ of size 1 at 0x55555555a022 thread T0
#0 0x555555557620 in addpattern /home/cjt/src/sbase/grep.c:68
#1 0x555555557846 in addpatternfile /home/cjt/src/sbase/grep.c:96
#2 0x55555555834a in main /home/cjt/src/sbase/grep.c:213
#3 0x7ffff7427674 (/usr/lib/libc.so.6+0x27674) (BuildId:
4fe011c94a88e8aeb6f2201b9eb369f42b4a1e9e)
#4 0x7ffff7427728 in __libc_start_main
(/usr/lib/libc.so.6+0x27728) (BuildId:
4fe011c94a88e8aeb6f2201b9eb369f42b4a1e9e)
#5 0x5555555572e4 in _start (/home/cjt/src/sbase/grep+0x32e4)
(BuildId: dcb36777af50b79d8f264dfbe66653d14e5aafe5)
0x55555555a022 is located 0 bytes after global variable '*.LC0'
defined in 'grep.c' (0x55555555a020) of size 2
'*.LC0' is ascii string '^'
0x55555555a022 is located 62 bytes before global variable '*.LC1'
defined in 'grep.c' (0x55555555a060) of size 1
'*.LC1' is ascii string ''
SUMMARY: AddressSanitizer: global-buffer-overflow
/home/cjt/src/sbase/grep.c:68 in addpattern
Shadow bytes around the buggy address:
0x555555559d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x555555559e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x555555559e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x555555559f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x555555559f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x55555555a000: 00 00 00 00[02]f9 f9 f9 f9 f9 f9 f9 01 f9 f9 f9
0x55555555a080: f9 f9 f9 f9 02 f9 f9 f9 f9 f9 f9 f9 07 f9 f9 f9
0x55555555a100: f9 f9 f9 f9 02 f9 f9 f9 f9 f9 f9 f9 03 f9 f9 f9
0x55555555a180: f9 f9 f9 f9 02 f9 f9 f9 f9 f9 f9 f9 03 f9 f9 f9
0x55555555a200: f9 f9 f9 f9 00 00 01 f9 f9 f9 f9 f9 00 04 f9 f9
0x55555555a280: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 05 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
==114878==ABORTING
[Inferior 1 (process 114878) exited with code 01]
(gdb)
