==6246== Memcheck, a memory error detector
==6246== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==6246== Using Valgrind-3.12.0.SVN and LibVEX; rerun with -h for copyright info
==6246== Command: ./src/grep -E (\\'|^)(\\1|)
==6246== 
grep: regexec.c:1359: pop_fail_stack: Assertion `num >= 0' failed.
==6246== 
==6246== Process terminating with default action of signal 6 (SIGABRT)
==6246==    at 0x50DDFFF: raise (raise.c:51)
==6246==    by 0x50DF429: abort (abort.c:89)
==6246==    by 0x50D6E66: __assert_fail_base (assert.c:92)
==6246==    by 0x50D6F11: __assert_fail (assert.c:101)
==6246==    by 0x138398: pop_fail_stack (regexec.c:1359)
==6246==    by 0x138831: set_regs (regexec.c:1463)
==6246==    by 0x136F42: re_search_internal (regexec.c:861)
==6246==    by 0x136088: re_search_stub (regexec.c:424)
==6246==    by 0x135BCF: rpl_re_search (regexec.c:289)
==6246==    by 0x10C702: EGexecute (dfasearch.c:357)
==6246==    by 0x10E763: grepbuf (grep.c:1397)
==6246==    by 0x10EC80: grep (grep.c:1528)
==6246== 
==6246== HEAP SUMMARY:
==6246==     in use at exit: 55,444 bytes in 173 blocks
==6246==   total heap usage: 366 allocs, 193 frees, 95,752 bytes allocated
==6246== 
==6246== LEAK SUMMARY:
==6246==    definitely lost: 0 bytes in 0 blocks
==6246==    indirectly lost: 0 bytes in 0 blocks
==6246==      possibly lost: 0 bytes in 0 blocks
==6246==    still reachable: 55,444 bytes in 173 blocks
==6246==         suppressed: 0 bytes in 0 blocks
==6246== Rerun with --leak-check=full to see details of leaked memory
==6246== 
==6246== For counts of detected and suppressed errors, rerun with: -v
==6246== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)