diff --git a/builtin-functions/kphp-light/array.txt b/builtin-functions/kphp-light/array.txt
index c761056875..f88badd317 100644
--- a/builtin-functions/kphp-light/array.txt
+++ b/builtin-functions/kphp-light/array.txt
@@ -107,3 +107,14 @@ function rsort (&$a ::: array, $flag ::: int = SORT_REGULAR) ::: void;
 
 function sort (&$a ::: array, $flag ::: int = SORT_REGULAR) ::: void;
 
+/** @kphp-extern-func-info interruptible */
+function uksort (&$a ::: array, callable(mixed $x, mixed $y):int $callback) ::: void;
+
+/** @kphp-extern-func-info interruptible */
+function usort (&$a ::: array, callable(^1[*] $x, ^1[*] $y):int $callback) ::: void;
+
+/** @kphp-extern-func-info interruptible */
+function uasort (&$a ::: array, callable(^1[*] $x, ^1[*] $y):int $callback) ::: void;
+
+
+
diff --git a/builtin-functions/kphp-light/unsupported/arrays.txt b/builtin-functions/kphp-light/unsupported/arrays.txt
index a1fdee0cb5..6d8a78de70 100644
--- a/builtin-functions/kphp-light/unsupported/arrays.txt
+++ b/builtin-functions/kphp-light/unsupported/arrays.txt
@@ -46,10 +46,6 @@ function array_is_vector ($a ::: array) ::: bool;
 function array_is_list ($a ::: array) ::: bool;
 
 
-function uasort (&$a ::: array, callable(^1[*] $x, ^1[*] $y):int $callback) ::: void;
-function uksort (&$a ::: array, callable(mixed $x, mixed $y):int $callback) ::: void;
-function usort (&$a ::: array, callable(^1[*] $x, ^1[*] $y):int $callback) ::: void;
-
 /** @kphp-extern-func-info cpp_template_call */
 function vk_dot_product ($a ::: array, $b ::: array) ::: ^1[*] | ^2[*];
 
diff --git a/compiler/code-gen/declarations.cpp b/compiler/code-gen/declarations.cpp
index e1218376c5..be6c236fbc 100644
--- a/compiler/code-gen/declarations.cpp
+++ b/compiler/code-gen/declarations.cpp
@@ -115,8 +115,8 @@ void FunctionParams::declare_cpp_param(CodeGenerator &W, VertexAdaptor<op_var> v
   auto var_ptr = var->var_id;
   if (var->ref_flag) {
     W << "&";
-  } else if (!function->is_k2_fork && (var_ptr->marked_as_const || (!function->has_variadic_param && var_ptr->is_read_only))) {
-    // the top of k2 fork must take arguments by value (see C++ avoid reference parameters in coroutines)
+  } else if (!function->is_interruptible && (var_ptr->marked_as_const || (!function->has_variadic_param && var_ptr->is_read_only))) {
+    // interruptible function must take arguments by value (see C++ avoid reference parameters in coroutines)
     W << (!type.type->is_primitive_type() ? "const &" : "");
   }
   W << VarName(var_ptr);
diff --git a/runtime-common/core/core-types/decl/array_decl.inl b/runtime-common/core/core-types/decl/array_decl.inl
index 893616334e..fcf7cdc0a3 100644
--- a/runtime-common/core/core-types/decl/array_decl.inl
+++ b/runtime-common/core/core-types/decl/array_decl.inl
@@ -29,7 +29,18 @@ struct array_size {
 
 namespace dl {
 template<class T, class TT, class T1>
-void sort(TT *begin_init, TT *end_init, const T1 &compare);
+void sort(TT *begin_init, TT *end_init, T1 compare) noexcept;
+}
+
+namespace array_functions_impl_ {
+/*
+ * async analog of array::sort and array::ksort since in runtime-light comparator can be coroutine
+ * */
+template<typename Result, typename U, typename Comparator>
+Result async_sort(array<U> & arr, Comparator comparator, bool renumber) noexcept;
+
+template<typename Result, typename U, typename Comparator>
+Result async_ksort(array<U> & arr, Comparator comparator) noexcept;
 }
 
 enum class overwrite_element { YES, NO };
@@ -438,6 +449,12 @@ private:
 
   template<class T1>
   friend class array;
+
+  template<typename Result, typename U, typename Comparator>
+  friend Result array_functions_impl_::async_sort(array<U> & arr, Comparator comparator, bool renumber) noexcept;
+
+  template<typename Result, typename U, typename Comparator>
+  friend Result array_functions_impl_::async_ksort(array<U> & arr, Comparator comparator) noexcept;
 };
 
 template<class T>
diff --git a/runtime-light/stdlib/array/array-functions.h b/runtime-light/stdlib/array/array-functions.h
index cde085d5a7..b514298a4c 100644
--- a/runtime-light/stdlib/array/array-functions.h
+++ b/runtime-light/stdlib/array/array-functions.h
@@ -5,16 +5,202 @@
 #pragma once
 
 #include <concepts>
+#include <cstdint>
 #include <functional>
 #include <utility>
 
 #include "runtime-common/core/runtime-core.h"
+#include "runtime-common/stdlib/array/array-functions.h"
 #include "runtime-light/coroutine/task.h"
 #include "runtime-light/stdlib/math/random-functions.h"
 #include "runtime-light/utils/concepts.h"
 
+namespace dl {
+
+template<typename T, typename Comparator>
+requires(std::invocable<Comparator, T, T> && is_async_function_v<Comparator, T, T>)
+task_t<void> async_sort(T *begin_init, T *end_init, Comparator compare) noexcept {
+  T *begin_stack[32];
+  T *end_stack[32];
+
+  begin_stack[0] = begin_init;
+  end_stack[0] = end_init - 1;
+
+  for (int depth = 0; depth >= 0; --depth) {
+    T *begin = begin_stack[depth];
+    T *end = end_stack[depth];
+
+    while (begin < end) {
+      const auto offset = (end - begin) >> 1;
+      swap(*begin, begin[offset]);
+
+      T *i = begin + 1;
+      T *j = end;
+
+      while (true) {
+        while (i < j && (co_await std::invoke(compare, *begin, *i)) > 0) {
+          i++;
+        }
+
+        while (i <= j && (co_await std::invoke(compare, *j, *begin)) > 0) {
+          j--;
+        }
+
+        if (i >= j) {
+          break;
+        }
+
+        swap(*i++, *j--);
+      }
+
+      swap(*begin, *j);
+
+      if (j - begin <= end - j) {
+        if (j + 1 < end) {
+          begin_stack[depth] = j + 1;
+          end_stack[depth++] = end;
+        }
+        end = j - 1;
+      } else {
+        if (begin < j - 1) {
+          begin_stack[depth] = begin;
+          end_stack[depth++] = j - 1;
+        }
+        begin = j + 1;
+      }
+    }
+  }
+  co_return;
+}
+} // namespace dl
+
 namespace array_functions_impl_ {
 
+template<typename Result, typename U, typename Comparator>
+Result async_sort(array<U> &arr, Comparator comparator, bool renumber) noexcept {
+  using array_inner = typename array<U>::array_inner;
+  using array_bucket = typename array<U>::array_bucket;
+  int64_t n = arr.count();
+
+  if (renumber) {
+    if (n == 0) {
+      co_return;
+    }
+
+    if (!arr.is_vector()) {
+      array_inner *res = array_inner::create(n, true);
+      for (array_bucket *it = arr.p->begin(); it != arr.p->end(); it = arr.p->next(it)) {
+        res->push_back_vector_value(it->value);
+      }
+
+      arr.p->dispose();
+      arr.p = res;
+    } else {
+      arr.mutate_if_vector_shared();
+    }
+
+    U *begin = reinterpret_cast<U *>(arr.p->entries());
+    co_await dl::async_sort<U, decltype(comparator)>(begin, begin + n, std::move(comparator));
+    co_return;
+  }
+
+  if (n <= 1) {
+    co_return;
+  }
+
+  if (arr.is_vector()) {
+    arr.convert_to_map();
+  } else {
+    arr.mutate_if_map_shared();
+  }
+
+  auto **arTmp = static_cast<array_bucket **>(RuntimeAllocator::get().alloc_script_memory(n * sizeof(array_bucket *)));
+  uint32_t i = 0;
+  for (array_bucket *it = arr.p->begin(); it != arr.p->end(); it = arr.p->next(it)) {
+    arTmp[i++] = it;
+  }
+  php_assert(i == n);
+
+  const auto hash_entry_cmp = []<typename Compare>(Compare compare, const array_bucket *lhs, const array_bucket *rhs) -> task_t<bool> {
+    co_return(co_await std::invoke(compare, lhs->value, rhs->value)) > 0;
+  };
+
+  const auto partial_hash_entry_cmp = std::bind_front(hash_entry_cmp, std::move(comparator));
+
+  co_await dl::async_sort<array_bucket *, decltype(partial_hash_entry_cmp)>(arTmp, arTmp + n, partial_hash_entry_cmp);
+
+  arTmp[0]->prev = arr.p->get_pointer(arr.p->end());
+  arr.p->end()->next = arr.p->get_pointer(arTmp[0]);
+  for (uint32_t j = 1; j < n; j++) {
+    arTmp[j]->prev = arr.p->get_pointer(arTmp[j - 1]);
+    arTmp[j - 1]->next = arr.p->get_pointer(arTmp[j]);
+  }
+  arTmp[n - 1]->next = arr.p->get_pointer(arr.p->end());
+  arr.p->end()->prev = arr.p->get_pointer(arTmp[n - 1]);
+
+  RuntimeAllocator::get().free_script_memory(arTmp, n * sizeof(array_bucket *));
+}
+
+template<typename Result, typename U, typename Comparator>
+Result async_ksort(array<U> &arr, Comparator comparator) noexcept {
+  using array_bucket = typename array<U>::array_bucket;
+  using key_type = typename array<U>::key_type;
+  using list_hash_entry = typename array<U>::list_hash_entry;
+
+  int64_t n = arr.count();
+  if (n <= 1) {
+    co_return;
+  }
+
+  if (arr.is_vector()) {
+    arr.convert_to_map();
+  } else {
+    arr.mutate_if_map_shared();
+  }
+
+  array<key_type> keys(array_size(n, true));
+  for (auto *it = arr.p->begin(); it != arr.p->end(); it = arr.p->next(it)) {
+    keys.p->push_back_vector_value(it->get_key());
+  }
+
+  auto *keysp = reinterpret_cast<key_type *>(keys.p->entries());
+  co_await dl::async_sort<key_type, Comparator>(keysp, keysp + n, std::move(comparator));
+
+  auto *prev = static_cast<list_hash_entry *>(arr.p->end());
+  for (uint32_t j = 0; j < n; j++) {
+    list_hash_entry *cur = nullptr;
+    if (arr.is_int_key(keysp[j])) {
+      int64_t int_key = keysp[j].to_int();
+      uint32_t bucket = arr.p->choose_bucket(int_key);
+      while (arr.p->entries()[bucket].int_key != int_key || !arr.p->entries()[bucket].string_key.is_dummy_string()) {
+        if (++bucket == arr.p->buf_size) [[unlikely]] {
+          bucket = 0;
+        }
+      }
+      cur = static_cast<list_hash_entry *>(&arr.p->entries()[bucket]);
+    } else {
+      string string_key = keysp[j].to_string();
+      int64_t int_key = string_key.hash();
+      array_bucket *string_entries = arr.p->entries();
+      uint32_t bucket = arr.p->choose_bucket(int_key);
+      while (
+        (string_entries[bucket].int_key != int_key || string_entries[bucket].string_key.is_dummy_string() || string_entries[bucket].string_key != string_key)) {
+        if (++bucket == arr.p->buf_size) [[unlikely]] {
+          bucket = 0;
+        }
+      }
+      cur = static_cast<list_hash_entry *>(&string_entries[bucket]);
+    }
+
+    cur->prev = arr.p->get_pointer(prev);
+    prev->next = arr.p->get_pointer(cur);
+
+    prev = cur;
+  }
+  prev->next = arr.p->get_pointer(arr.p->end());
+  arr.p->end()->prev = arr.p->get_pointer(prev);
+}
+
 template<typename T>
 concept convertible_to_php_bool = requires(T t) {
   { f$boolval(t) } -> std::convertible_to<bool>;
@@ -223,19 +409,41 @@ array<T> f$array_combine(const array<T1> &keys, const array<T> &values) {
   php_critical_error("call to unsupported function");
 }
 
-template<class T, class T1>
-void f$usort(array<T> &a, const T1 &compare) {
-  php_critical_error("call to unsupported function");
+template<class T, class Comparator>
+requires(std::invocable<Comparator, T, T>) task_t<void> f$usort(array<T> &a, Comparator compare) {
+  if constexpr (is_async_function_v<Comparator, T, T>) {
+    /* make temporary copy since functions is coroutine and sort is inplace */
+    array<T> tmp = a;
+    co_await array_functions_impl_::async_sort<task_t<void>>(tmp, std::move(compare), true);
+    a = tmp;
+    co_return;
+  } else {
+    co_return a.sort(std::move(compare), true);
+  }
 }
 
-template<class T, class T1>
-void f$uasort(array<T> &a, const T1 &compare) {
-  php_critical_error("call to unsupported function");
+template<class T, class Comparator>
+requires(std::invocable<Comparator, T, T>) task_t<void> f$uasort(array<T> &a, Comparator compare) {
+  if constexpr (is_async_function_v<Comparator, T, T>) {
+    /* make temporary copy since functions is coroutine and sort is inplace */
+    array<T> tmp = a;
+    co_await array_functions_impl_::async_sort<task_t<void>>(tmp, std::move(compare), false);
+    a = tmp;
+  } else {
+    co_return a.sort(std::move(compare), false);
+  }
 }
 
-template<class T, class T1>
-void f$uksort(array<T> &a, const T1 &compare) {
-  php_critical_error("call to unsupported function");
+template<class T, class Comparator>
+requires(std::invocable<Comparator, typename array<T>::key_type, typename array<T>::key_type>) task_t<void> f$uksort(array<T> &a, Comparator compare) {
+  if constexpr (is_async_function_v<Comparator, T, T>) {
+    /* make temporary copy since functions is coroutine and sort is inplace */
+    array<T> tmp = a;
+    co_await array_functions_impl_::async_ksort<task_t<void>>(tmp, std::move(compare), false);
+    a = tmp;
+  } else {
+    co_return a.ksort(std::move(compare));
+  }
 }
 
 template<class T>
diff --git a/runtime/array_functions.h b/runtime/array_functions.h
index e1d9fba1c2..2b2a00d08f 100644
--- a/runtime/array_functions.h
+++ b/runtime/array_functions.h
@@ -720,3 +720,15 @@ T f$vk_dot_product(const array<T> &a, const array<T> &b) {
   }
   return vk_dot_product_sparse<T>(a, b);
 }
+
+template<typename Result, typename U, typename Comparator>
+Result array_functions_impl_::async_sort(__attribute__((unused)) array<U> & arr, __attribute__((unused)) Comparator comparator, __attribute__((unused)) bool renumber) noexcept {
+  struct async_sort_stub_class {};
+  static_assert(std::is_same_v<Result, async_sort_stub_class>, "array async sort functions supported only in runtime light ");
+}
+
+template<typename Result, typename U, typename Comparator>
+Result array_functions_impl_::async_ksort(__attribute__((unused)) array<U> & arr, __attribute__((unused)) Comparator comparator) noexcept {
+  struct async_ksort_stub_class {};
+  static_assert(std::is_same_v<Result, async_ksort_stub_class>, "array async sort functions supported only in runtime light ");
+}
diff --git a/tests/phpt/dl/495_sort.php b/tests/phpt/dl/495_sort.php
index 1035a64378..040b8cd398 100644
--- a/tests/phpt/dl/495_sort.php
+++ b/tests/phpt/dl/495_sort.php
@@ -1,4 +1,4 @@
-@ok benchmark callback k2_skip
+@ok benchmark callback
 <?php
 echo "*** Testing sort() : basic functionality ***\n";
 
diff --git a/tests/phpt/nn/010_natsort.php b/tests/phpt/nn/010_natsort.php
index 2e57baa2cd..7912135a85 100644
--- a/tests/phpt/nn/010_natsort.php
+++ b/tests/phpt/nn/010_natsort.php
@@ -1,4 +1,4 @@
-@ok k2_skip
+@ok
 <?php
 /*
 * proto bool natsort ( array &$array )