[Bug regex/18037] infinite recursion (stack overflow) in regexec.c (sift_states_bkref->sift_states_backward->update_cur_sifted_state)

[konstantin.s.serebryany at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18037

--- Comment #1 from Kostya Serebryany <konstantin.s.serebryany at gmail dot com> ---
Happens also without REG_EXTENDED:

#include <regex.h>
int main() {
  regex_t r;
  if (!regcomp(&r, "^9*\\(\\)\\1\\+\\+", 0))
    regexec(&r, "foo.*bar", 0, 0, 0);
}

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