diff --git a/judger/justfile b/judger/justfile
index a13a2d46..f2c3c941 100644
--- a/judger/justfile
+++ b/judger/justfile
@@ -11,7 +11,7 @@ release-plugin:
     cd plugins sh export-all.sh
     
 build-nsjail:
-    cd nsjail-docker && make nsjail-3.1
+    cd nsjail-docker && sudo make nsjail-3.1
     cp nsjail-docker/output/*-linux-musl/nsjail-* .
 
 prepare:
diff --git a/judger/plugins/c-11/compile.c b/judger/plugins/c-11/compile.c
index ec290b40..cae07cda 100644
--- a/judger/plugins/c-11/compile.c
+++ b/judger/plugins/c-11/compile.c
@@ -5,21 +5,24 @@
 #include <spawn.h>
 #include <errno.h>
 #include <sys/wait.h>
+#define handle(x,e) { \
+    if (e == x) \
+    { \
+        printf("4: %m\n", errno); \
+        return 1; \
+    } \
+}
 #define CC "/usr/local/bin/g++"
-#define SRC "/src/src.c"
+#define SRC "/src/src.cpp"
 #define OUT "/src/src.out"
 #define MAX_SIZE 131072
 
 int main()
 {
     FILE *source = fopen(SRC, "w");
-    if (source == NULL)
-    {
-        printf("2: %m\n", errno);
-        return 1;
-    }
-    else
-        printf("1: success create file!\n");
+    handle(source,NULL);
+
+    printf("1: success create file!\n");
 
     char *code = malloc(MAX_SIZE * sizeof(char));
     size_t len = fread(code, sizeof(char), MAX_SIZE, stdin);
@@ -29,15 +32,12 @@ int main()
 
     char *args[] = {CC, "-x", "c", SRC, "-lm", "-o", OUT, NULL};
     int pid, status;
-    if (execvp(CC, args) != -1)
-    {
-        printf("1: success execv!\n");
-        if (wait(NULL) != -1)
-        {
-            printf("0: success!\n");
-            return 0;
-        }
-    }
-    printf("4: %m\n", errno);
+
+    handle(chdir("/tmp"),-1);
+    handle(execvp(CC, args),-1);
+    printf("1: success execv!\n");
+
+    handle(wait(NULL),-1);
+    printf("0: success!\n");
     return 1;
 }
\ No newline at end of file
diff --git a/judger/plugins/cpp-11/compile.c b/judger/plugins/cpp-11/compile.c
index e21a971d..cad6d2cc 100644
--- a/judger/plugins/cpp-11/compile.c
+++ b/judger/plugins/cpp-11/compile.c
@@ -5,6 +5,13 @@
 #include <spawn.h>
 #include <errno.h>
 #include <sys/wait.h>
+#define handle(x,e) { \
+    if (e == x) \
+    { \
+        printf("4: %m\n", errno); \
+        return 1; \
+    } \
+}
 #define CC "/usr/local/bin/g++"
 #define SRC "/src/src.cpp"
 #define OUT "/src/src.out"
@@ -13,13 +20,9 @@
 int main()
 {
     FILE *source = fopen(SRC, "w");
-    if (source == NULL)
-    {
-        printf("2: %m\n", errno);
-        return 1;
-    }
-    else
-        printf("1: success create file!\n");
+    handle(source,NULL);
+
+    printf("1: success create file!\n");
 
     char *code = malloc(MAX_SIZE * sizeof(char));
     size_t len = fread(code, sizeof(char), MAX_SIZE, stdin);
@@ -29,15 +32,12 @@ int main()
 
     char *args[] = {CC, SRC, "-lm", "-o", OUT, NULL};
     int pid, status;
-    if (execvp(CC, args) != -1)
-    {
-        printf("1: success execv!\n");
-        if (wait(NULL) != -1)
-        {
-            printf("0: success!\n");
-            return 0;
-        }
-    }
-    printf("4: %m\n", errno);
+
+    handle(chdir("/tmp"),-1);
+    handle(execvp(CC, args),-1);
+    printf("1: success execv!\n");
+
+    handle(wait(NULL),-1);
+    printf("0: success!\n");
     return 1;
 }
\ No newline at end of file
diff --git a/judger/src/init/logger.rs b/judger/src/init/logger.rs
index cbb3eaf5..4f2685fc 100644
--- a/judger/src/init/logger.rs
+++ b/judger/src/init/logger.rs
@@ -25,6 +25,7 @@ pub fn init() {
     let default_panic = std::panic::take_hook();
     std::panic::set_hook(Box::new(move |info| {
         default_panic(info);
+        log::error!("Panic at {}",info.location().map(|x|x.to_string()).unwrap_or_default());
         std::process::exit(1);
     }));
 }
diff --git a/judger/src/langs/artifact.rs b/judger/src/langs/artifact.rs
index d31ee51a..f1244c5d 100644
--- a/judger/src/langs/artifact.rs
+++ b/judger/src/langs/artifact.rs
@@ -190,6 +190,7 @@ impl<'a> CompiledArtifact<'a> {
         time: u64,
         memory: u64,
     ) -> Result<TaskResult, Error> {
+        log::debug!("Exit status: {}",self.process.status);
         debug_assert!(self.process.succeed());
         let spec = self.spec;
         let mut limit = spec.judge_limit.clone().apply_platform();
@@ -227,6 +228,7 @@ impl<'a> CompiledArtifact<'a> {
         time: u64,
         memory: u64,
     ) -> Result<ExecResult, Error> {
+        log::debug!("Exit status: {}",self.process.status);
         debug_assert!(self.process.succeed());
         let spec = self.spec;
         let mut limit = spec.judge_limit.clone().apply_platform();
diff --git a/judger/src/sandbox/utils/nsjail.rs b/judger/src/sandbox/utils/nsjail.rs
index b142f113..5c80e131 100644
--- a/judger/src/sandbox/utils/nsjail.rs
+++ b/judger/src/sandbox/utils/nsjail.rs
@@ -101,7 +101,9 @@ impl MountBuilder {
 
         self
     }
-    pub fn done(self) -> CommonBuilder {
+    pub fn done(mut self) -> CommonBuilder {
+        self.cmds.push(Cow::Borrowed("--tmpfsmount"));
+        self.cmds.push(Cow::Borrowed("/tmp"));
         CommonBuilder { cmds: self.cmds }
     }
 }