ufuzz failure

[alexlamsl]

// original code
// (beautified)
var _calls_ = 10, a = 100, b = 10, c = 0;

function f0(b_1_2, b_1) {
    {
        var brake1 = 5;
        L28635: do {
            if ([ --b + [ b_1_2 ].set ]) {
                if (--b + (Number(0xdeadn << 16n | 0xbeefn) in {
                    b_1: b_1,
                    1.5: --b + {
                        Infinity: (c = 1 + c, -(b_1 = "undefined" == NaN && 38..toString() > ([ , 0 ].length === 2)))
                    }[typeof (c = 1 + c, b_1_2 = (NaN << "bar" | (24..toString() || Infinity), 
                    "object" * -0 ^ "bar" << "undefined"))]
                })) {
                    L28636: for (var brake5 = 5; (c = c + 1) + b-- && brake5 > 0; --brake5) {
                        continue L28635;
                    }
                } else {}
                c = c + 1;
                L28637: {}
                {
                    var a = function b_1_2(arguments_2, b_1_2_2 = (b_1_2 *= -3 * 24..toString() == -5 <= -5) === (b_1_2 && (b_1_2.undefined = -4 && "c" || +null)), a_1) {
                        function f1(yield_1, b_2, Infinity_1) {
                            c = 1 + c, ("bar" > "object") * (-1) ** 38..toString() != ((b_1 = "object" !== this) && false == null);
                        }
                        var b_1_2_1 = f1();
                        function f2(b_1_2_1, yield) {
                            c = 1 + c, (arguments_2 && (arguments_2.done = -0 !== {})) >>> (1 === /[a2][^e]+$/) == ((b_1_2_2 && (b_1_2_2[c = 1 + c, 
                            (c = c + 1, -3 == -1) < ({} >> 25 && undefined & null)] += "bar" * 25)) === (true === "bar"));
                        }
                        var foo_2 = f2("bar", --b + {
                            ...b_1,
                            next: (c = 1 + c, (4 ^ [ 3n ][0] > 2) << (undefined ^ -4) & ((b_1_2 && (b_1_2.Infinity = [ , 0 ].length === 2 == this)) ^ "number" + "")),
                            NaN: (c = 1 + c, (c = c + 1, /[a2][^e]+$/, -0) != (0 !== /[a2][^e]+$/) > (-1 ^ 38..toString()))
                        }[c = 1 + c, (arguments_2 += (-4 < this) + (-1) ** [ , 0 ][1]) + void +([ , 0 ].length === 2)]);
                    }("b" in [], null);
                }
            } else {
                switch (a++ + [ ..."" + b_1_2, ..."" + b_1, (c = c + 1) + {
                    "\t": --b + (null in {})
                }[--b + (typeof b_1 == "function" && --_calls_ >= 0 && b_1("bar"))], "function" in {
                    b: [ (c = 1 + c, b_1 && (b_1[a++ + [ , 0 ][1]] <<= (3 + 5) * (-4) ** "a" === this >>> "" >> ("foo" || 3))), (c = 1 + c, 
                    c = c + 1, null > [] ^ (3 ^ -0)) ][{
                        done: (c = 1 + c, "" + -5 - {} % -3 << ("" >> 23..toString() <= {} - 24..toString())),
                        then: (c = 1 + c, ("foo" <= "foo" == "object" < "b") >>> (0 <= "a") - (5 + -5))
                    }[c = 1 + c, (c = c + 1, "object") % (false - 4) == -4 <= true <= ("undefined" | "bar")]],
                    ...typeof b_1 == "function" && --_calls_ >= 0 && b_1(),
                    in: typeof (1 === 1 ? a : b),
                    set: (c = c + 1) + (b_1_2 && b_1_2[--b + [ (c = 1 + c, ("" && "a") / (NaN >> "") % (([ , 0 ][1] < 0) + -0 % 4)), (c = 1 + c, 
                    (null ** this == (-0 == {})) - (!0o644n == "number" == false << "")), (c = 1 + c, 
                    (false + "c", this === []) & (b_1_2 && (b_1_2[--b + /[abc4]/.test(((c = 1 + c, 
                    void ((-3 == 5) > (-3 || "b"))) || b || 5).toString())] %= (5 < 23..toString()) * (2 + -1)))) ]]),
                    "\t": -(("a" >> -1 ^ false === 23..toString()) != ([] >>> 3 ^ "number" & [ , 0 ][1]))
                }, a++ + (([] == 23..toString()) >>> (25 >>> true), ("bar", "") >> (-2 << ([ , 0 ].length === 2))) ].value) {
                  case 0 === 1 ? a : b:
                    break;

                  default:
                  case {}.undefined:
                  case --b + b_1:
                    for (var brake14 = 5; --b + (b_1 && b_1.static) && brake14 > 0; --brake14) {
                        c = c + 1;
                    }
                    break;
                }
            }
        } while (a++ + ((c = c + 1, 24..toString() >= 4) && (23..toString(), []) & -5 != /[a2][^e]+$/) && --brake1 > 0);
    }
}

var b_1 = f0(false, a && typeof a.next == "function" && --_calls_ >= 0 && a.next(a++ + (0 === 1 ? a : b)), {});

console.log(null, a, b, c, Infinity, NaN, undefined);

// uglified code
// (beautified)
var _calls_ = 10, a = 100, b = 10, c = 0;

function f0(b_1_2, b_1) {
    var brake1 = 5;
    L28635: do {
        if (--b, --b + (Number(0xdeadn << 16n | 0xbeefn) in {
            b_1: b_1,
            1.5: --b + {
                Infinity: -(b_1 = !1)
            }[c = 1 + (c = 1 + c), 24..toString(), typeof 0]
        })) {
            var brake5 = 5;
            if ((c += 1) + b-- && 0 < brake5) {
                continue L28635;
            }
        }
        c += 1;
        brake5 = function b_1_2(arguments_2, b_1_2_2 = b_1_2 * (-3 * 24..toString() == 1) === (b_1_2 && (b_1_2.undefined = "c")), a_1) {
            (function() {
                c = 1 + c, 38..toString(), b_1 = "object" !== this;
            })();
            --b, {
                ...b_1
            }, c = 1 + c, b_1_2 && (b_1_2.Infinity = 2 === [ , 0 ].length == this), 
            c = 1 + c, c += 1, 38..toString(), c = 1 + (c = 1 + c), (arguments_2 += 1 + (-4 < this)) && (arguments_2.done = -0 !== {}), 
            b_1_2_2 && (b_1_2_2[c = 1 + c, c += 1, !1 < ({} >> 25 && 0)] += NaN);
        }("b" in [], null);
    } while (brake5++ + (c += 1, 4 <= 24..toString() && !0 & (23..toString(), [])) && 0 < --brake1);
}

var b_1 = f0(!1, a && "function" == typeof a.next && 0 <= --_calls_ && a.next(a++ + b), {});

console.log(null, a, b, c, 1 / 0, NaN, void 0);

original result:
null 100 6 4 Infinity NaN undefined

uglified result:
null 100 -2 18 Infinity NaN undefined

// reduced test case (output will differ)

// (beautified)
function f0() {
    L28635: do {
        if (0 + {}) {
            for (var brake5 = 5; brake5; --brake5) {
                continue L28635;
            }
        } else {}
        var a = 0;
    } while (a);
}

f0();
// output: 
// minify: Error: Script execution timed out after 100ms
// options: {
//   "mangle": false,
//   "module": false,
//   "output": {
//     "v8": true
//   },
//   "validate": true
// }

minify(options):
{
  "mangle": false,
  "module": false,
  "output": {
    "v8": true
  }
}

Suspicious compress options:
  dead_code
  loops
  merge_vars
  unused