diff --git a/Cargo.lock b/Cargo.lock
index a6b99aad..7d624bcb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -349,6 +349,7 @@ dependencies = [
  "axerrno",
  "axhal",
  "kspin",
+ "lazy_static",
  "lazyinit",
  "log",
  "memory_addr",
@@ -828,6 +829,15 @@ dependencies = [
  "kernel_guard",
 ]
 
+[[package]]
+name = "lazy_static"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+dependencies = [
+ "spin",
+]
+
 [[package]]
 name = "lazyinit"
 version = "0.2.1"
@@ -982,7 +992,7 @@ checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
 [[package]]
 name = "page_table_entry"
 version = "0.5.3"
-source = "git+https://github.com/Mivik/page_table_multiarch.git?rev=19ededd#19ededdb806ab3b22efb4880661790524fa421a5"
+source = "git+https://github.com/Mivik/page_table_multiarch.git?rev=5c222f2#5c222f2199a6c566e9009dca8d86a589b4f66757"
 dependencies = [
  "aarch64-cpu",
  "bitflags 2.9.0",
@@ -993,7 +1003,7 @@ dependencies = [
 [[package]]
 name = "page_table_multiarch"
 version = "0.5.3"
-source = "git+https://github.com/Mivik/page_table_multiarch.git?rev=19ededd#19ededdb806ab3b22efb4880661790524fa421a5"
+source = "git+https://github.com/Mivik/page_table_multiarch.git?rev=5c222f2#5c222f2199a6c566e9009dca8d86a589b4f66757"
 dependencies = [
  "log",
  "memory_addr",
diff --git a/Cargo.toml b/Cargo.toml
index 9d11edb5..7c776b96 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ axconfig = { git = "https://github.com/oscomp/arceos.git" }
 axfs = { git = "https://github.com/oscomp/arceos.git" }
 axhal = { git = "https://github.com/oscomp/arceos.git", features = ["uspace"] }
 axlog = { git = "https://github.com/oscomp/arceos.git" }
-axmm = { git = "https://github.com/oscomp/arceos.git" }
+axmm = { git = "https://github.com/oscomp/arceos.git", features = ["cow"] }
 axnet = { git = "https://github.com/oscomp/arceos.git" }
 axns = { git = "https://github.com/oscomp/arceos.git", features = [
     "thread-local",
@@ -90,5 +90,5 @@ shlex = { version = "1.3.0", default-features = false }
 syscalls = { git = "https://github.com/jasonwhite/syscalls.git", rev = "92624de", default-features = false }
 
 [patch.crates-io]
-page_table_multiarch = { git = "https://github.com/Mivik/page_table_multiarch.git", rev = "19ededd" }
-page_table_entry = { git = "https://github.com/Mivik/page_table_multiarch.git", rev = "19ededd" }
+page_table_multiarch = { git = "https://github.com/Mivik/page_table_multiarch.git", rev = "5c222f2" }
+page_table_entry = { git = "https://github.com/Mivik/page_table_multiarch.git", rev = "5c222f2" }
diff --git a/apps/libc/c/forkcow/forkcow.c b/apps/libc/c/forkcow/forkcow.c
new file mode 100644
index 00000000..fcb4d3d5
--- /dev/null
+++ b/apps/libc/c/forkcow/forkcow.c
@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+#define N 150
+#define LEN (1024 * 1024)
+
+void forktest(void) {
+  int n, pid;
+
+  printf("fork test\n");
+
+  char *ptr = mmap(NULL, LEN * sizeof(char), PROT_READ | PROT_WRITE,
+                  MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+  for (n = 0; n < LEN; n++) {
+      *(ptr + n) = 'a';
+  }
+
+  for (n = 0; n < N; n++) {
+    pid = fork();
+    if (pid < 0)
+      break;
+    if (pid == 0)
+      exit(0);
+  }
+
+  if (n == N) {
+    printf("fork test OK\n");
+    exit(0);
+  }
+
+  for (; n > 0; n--) {
+    if (wait(0) < 0) {
+      printf("wait stopped early\n");
+      exit(1);
+    }
+  }
+
+  if (wait(0) != -1) {
+    printf("wait got too many\n");
+    exit(1);
+  }
+}
+
+int main(void) {
+  forktest();
+  exit(1);
+}
diff --git a/apps/libc/expect_off.out b/apps/libc/expect_off.out
index 4e86961f..3c428cb4 100644
--- a/apps/libc/expect_off.out
+++ b/apps/libc/expect_off.out
@@ -22,3 +22,6 @@ test_sigwait ok3
 test_sigsuspend ok1
 test_sigsuspend ok2
 test_sigsuspend ok3
+
+fork test
+fork test OK
diff --git a/apps/libc/testcase_list b/apps/libc/testcase_list
index 3f68ac85..97999977 100644
--- a/apps/libc/testcase_list
+++ b/apps/libc/testcase_list
@@ -1,4 +1,5 @@
 helloworld_c
 sleep_c
 signal_c
+forkcow_c
 mmap_c
diff --git a/scripts/get_deps.sh b/scripts/get_deps.sh
index eea6e2f4..7bceed1d 100755
--- a/scripts/get_deps.sh
+++ b/scripts/get_deps.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 AX_ROOT=.arceos
-COMMIT=54d5739
+COMMIT=a634925
 test ! -d "$AX_ROOT" && echo "Cloning repositories ..." || true
 test ! -d "$AX_ROOT" && git clone https://github.com/oscomp/arceos "$AX_ROOT" || true