--- a/src/impl/vm_impl_private.cbc	Thu Feb 06 18:34:54 2020 +0900
+++ b/src/impl/vm_impl_private.cbc	Thu Feb 06 20:22:31 2020 +0900
@@ -12,7 +12,10 @@
 
 __code loaduvm_ptesize_checkvm_impl(struct vm_impl* vm_impl,char* addr,  __code next(int ret, ...)) {
     if ((uint) addr %PTE_SZ != 0) {
-       // goto panic 
+       char* msg = "addr % PTE_SZ != 0";
+       struct Err* err = createKernelError(&proc->cbc_context);
+       Gearef(cbc_context, Err)->msg = msg;
+       goto err->panic(msg);
     }
 
     goto loaduvm_loopvm_impl(vm_impl, next(ret, ...));
@@ -58,7 +61,10 @@
 
 __code loaduvm_check_pgdir(struct vm_impl* vm_impl, pte_t* pte, pde_t* pgdir, uint i, char* addr, uint pa, __code next(int ret, ...)) {
     if ((pte = walkpgdir(pgdir, addr + i, 0)) == 0) {
-        // goto panic
+       char* msg = "pte != walkpgdir...";
+       struct Err* err = createKernelError(&proc->cbc_context);
+       Gearef(cbc_context, Err)->msg = msg;
+       goto err->panic(msg);
     } 
     pa = PTE_ADDR(*pte);
 
@@ -192,8 +198,10 @@
 
     pte = walkpgdir(pgdir, uva, 0);
     if (pte == 0) {
-        // panic("clearpteu");
-        // goto panic;
+         char* msg = "clearpteu";
+         struct Err* err = createKernelError(&proc->cbc_context);
+         Gearef(cbc_context, Err)->msg = msg;
+         goto err->panic(msg);
     }
 
     // in ARM, we change the AP field (ap & 0x3) << 4)
@@ -231,8 +239,10 @@
 
 __code copyuvm_loop_check_walkpgdir(struct vm_impl* vm_impl, pde_t* pgdir, uint sz, pde_t* d, pte_t* pte, uint pa, uint i, uint ap, char* mem, __code next(int ret, ...)) {
         if ((pte = walkpgdir(pgdir, (void *) i, 0)) == 0) {
-            // panic("copyuvm: pte should exist");
-            // goto panic();
+           char* msg = "copyuvm: pte should exist";
+           struct Err* err = createKernelError(&proc->cbc_context);
+           Gearef(cbc_context, Err)->msg = msg;
+           goto err->panic(msg);
         }
     goto copyuvm_loop_check_pte(vm_impl, pgdir, sz, d, pte, pa, i, ap, mem, __code next(int ret, ...));
 }
@@ -240,8 +250,10 @@
 __code copyuvm_loop_check_pte(struct vm_impl* vm_impl, pde_t* pgdir, uint sz, pde_t* d, pte_t* pte, uint pa, uint i, uint ap, char* mem, __code next(int ret, ...)) {
 
         if (!(*pte & PE_TYPES)) {
-            // panic("copyuvm: page not present");
-            // goto panic();
+           char* msg = "copyuvm: page not present";
+           struct Err* err = createKernelError(&proc->cbc_context);
+           Gearef(cbc_context, Err)->msg = msg;
+           goto err->panic(msg);
         }
 
     goto copyuvm_loop_check_mem(vm_impl, pgdir, sz, d, pte, pa, i, ap, mem, __code next(int ret, ...));
@@ -360,7 +372,10 @@
     pushcli();
 
     if (p->pgdir == 0) {
-        panic("switchuvm: no pgdir");
+        char* msg = "switchuvm: no pgdir";
+        struct Err* err = createKernelError(&proc->cbc_context);
+        Gearef(cbc_context, Err)->msg = msg;
+        goto err->panic(msg);
     }
 
     val = (uint) V2P(p->pgdir) | 0x00;
@@ -377,8 +392,10 @@
     char* mem;
 
     if (sz >= PTE_SZ) {
-        // goto panic;
-        // panic("inituvm: more than a page");
+       char* msg = "inituvm: more than a page";
+       struct Err* err = createKernelError(&proc->cbc_context);
+       Gearef(cbc_context, Err)->msg = msg;
+       goto err->panic(msg);
     }
 
     mem = alloc_page();