[Bug ipa/107769] [12/13 Regression] -flto with -Os/-O2/-O3 emitted code with gcc 12.x segfaults via mutated global in .rodata

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107769

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|-flto with -Os/-O2/-O3      |[12/13 Regression] -flto
                   |emitted code with gcc 12.x  |with -Os/-O2/-O3 emitted
                   |segfaults via mutated       |code with gcc 12.x
                   |global in .rodata           |segfaults via mutated
                   |                            |global in .rodata
     Ever confirmed|0                           |1
      Known to fail|                            |12.1.0, 13.0
             Status|UNCONFIRMED                 |NEW
   Target Milestone|---                         |12.3
   Last reconfirmed|                            |2022-11-20
      Known to work|                            |11.1.0

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, reduced further, removing malloc and changing srand into a function
inside the TU (with noipa attribute):
[[gnu::noipa]]
void hjj (unsigned int lk)
{
    (void)lk;
}
void nn(int i, int n);
[[gnu::noinline]]
int ll(void) {
    return 1;
}
void hh(int* dest, int src)
{
    if (!ll() && !src)
        hjj(100);
    (*dest) = 1;
}
void gg(int* result, int x)
{
    if (x >= 0)
        return;

    int xx;
    xx = *result;
    hh(result, ll());
    if (xx >= *result)
        nn(xx, *result);
}
void nn(int i, int n) {
    int T8_;
    if (n < 0)
        __builtin_exit(0);
    T8_ = 0;
    gg(&T8_, i);
    __builtin_exit(0);
}
void kk(int* x, int i) {
    hh(x, ll());
    if (i < 0 || i >= *x)
        nn(i,*x);
}
int g__r_1 = 0;
int main() {
    kk(&g__r_1, 0);
    return 0;
}