Update usertests && found deadlock on matrix/qemu platform

os/Makefile

@@ -23,7 +23,8 @@ USER_BUILD  := $(USER_DIR)/build
 IMG_FILE    := $(USER_BUILD)/riscv64.img
 QCOW2_FILE	:= $(USER_BUILD)/riscv64.qcow2
 
-OBJDUMP     := rust-objdump --arch-name=riscv64
+#OBJDUMP     := rust-objdump --arch-name=riscv64
+OBJDUMP		:= riscv64-unknown-elf-objdump
 OBJCOPY     := rust-objcopy --binary-architecture=riscv64
 
 .PHONY: doc kernel build clean qemu run env

user/rust/src/bin/r_usertests.rs

@@ -25,7 +25,7 @@ static tests: &[&str] = &[
     "badarg\0",
     "sleep\0",
     //"forktree\0",
-    "spin\0",
+    //"spin\0",
 ];
 
 use user_lib::{exec, fork, waitpid};

user/rust/src/bin/r_usertests_full.rs

@@ -0,0 +1,50 @@
+#![no_std]
+#![no_main]
+
+#[macro_use]
+extern crate user_lib;
+
+static tests: &[&str] = &[
+    "r_fantastic_text\0",
+    "r_forktest\0",
+    "r_forktest2\0",
+    "r_matrix\0",
+    "r_matrix_g\0",
+    "r_hello_world\0",
+    "r_sleep\0",
+    "r_stack_overflow\0",
+    "hello\0",
+    "forktest\0",
+    "divzero\0",
+    "testbss\0",
+    "faultread\0",
+    "faultreadkernel\0",
+    "exit\0",
+    "matrix\0",
+    "yield\0",
+    "badarg\0",
+    "sleep\0",
+    "forktree\0",
+    "spin\0",
+];
+
+use user_lib::{exec, fork, waitpid};
+
+#[no_mangle]
+pub fn main() -> i32 {
+    for test in tests {
+        println!("Usertests: Running {}", test);
+        let pid = fork();
+        if pid == 0 {
+            exec(*test as *const _ as *const u8);
+            panic!("unreachable!");
+        } else {
+            let mut xstate: i32 = Default::default();
+            let wait_pid = waitpid(pid as usize, &mut xstate);
+            assert_eq!(pid, wait_pid);
+            println!("Usertests: Test {} in Process {} exited with code {}", test, pid, xstate);
+        }
+    }
+    println!("Usertests passed!");
+    0
+}

user/ucore/src/matrix.c

@@ -41,7 +41,7 @@ work(unsigned int times) {
     exit(0);
 }
 
-const int total = 15;
+const int total = 13;
 
 int
 main(void) {