diff --git a/kernel/host.c b/kernel/host.c
index 6c3adf1a..9cdbf961 100644
--- a/kernel/host.c
+++ b/kernel/host.c
@@ -601,6 +601,20 @@ extern unsigned long do_kill(struct thread *, int, int, int, struct siginfo *, i
 extern void terminate_host(int pid);
 extern void debug_log(long);
 
+void send_procfs_answer(struct ikc_scd_packet *packet, int err)
+{
+	struct ikc_scd_packet pckt;
+	struct ihk_ikc_channel_desc *resp_channel = cpu_local_var(ikc2linux);
+
+	pckt.msg = SCD_MSG_PROCFS_ANSWER;
+	pckt.ref = packet->ref;
+	pckt.arg = packet->arg;
+	pckt.err = err;
+	pckt.reply = packet->reply;
+	pckt.pid = packet->pid;
+	syscall_channel_send(resp_channel, &pckt);
+}
+
 static int syscall_packet_handler(struct ihk_ikc_channel_desc *c,
                                   void *__packet, void *ihk_os)
 {
@@ -745,13 +759,7 @@ out_remote_pf:
 
 	case SCD_MSG_PROCFS_REQUEST:
 	case SCD_MSG_PROCFS_RELEASE:
-		pckt.msg = SCD_MSG_PROCFS_ANSWER;
-		pckt.ref = packet->ref;
-		pckt.arg = packet->arg;
-		pckt.err = process_procfs_request(packet);
-		pckt.reply = packet->reply;
-		pckt.pid = packet->pid;
-		syscall_channel_send(resp_channel, &pckt);
+		process_procfs_request(packet);
 		ret = 0;
 		break;
 
diff --git a/kernel/include/syscall.h b/kernel/include/syscall.h
index b54e5f06..f3aeb53c 100644
--- a/kernel/include/syscall.h
+++ b/kernel/include/syscall.h
@@ -412,6 +412,7 @@ struct procfs_file {
 };
 
 int process_procfs_request(struct ikc_scd_packet *rpacket);
+void send_procfs_answer(struct ikc_scd_packet *packet, int err);
 
 #define RUSAGE_SELF 0
 #define RUSAGE_CHILDREN -1
diff --git a/kernel/procfs.c b/kernel/procfs.c
index 57917a4c..277dbfe0 100644
--- a/kernel/procfs.c
+++ b/kernel/procfs.c
@@ -38,6 +38,7 @@
 extern int snprintf(char *buf, size_t size, const char *fmt, ...);
 extern int sscanf(const char * buf, const char * fmt, ...);
 extern int scnprintf(char * buf, size_t size, const char *fmt, ...);
+static int do_procfs_backlog(void *arg);
 
 struct mckernel_procfs_buffer {
 	unsigned long next_pa;
@@ -148,12 +149,28 @@ procfs_delete_thread(struct thread *thread)
 	procfs_thread_ctl(thread, SCD_MSG_PROCFS_TID_DELETE);
 }
 
+static int procfs_backlog(struct process_vm *vm, struct ikc_scd_packet *rpacket)
+{
+	void *arg;
+	int err;
+
+	if (!(arg = kmalloc(sizeof(struct ikc_scd_packet), IHK_MC_AP_NOWAIT))) {
+		return -ENOMEM;
+	}
+	memcpy(arg, rpacket, sizeof(struct ikc_scd_packet));
+	if ((err = add_backlog(do_procfs_backlog, arg))) {
+		kfree(arg);
+		return err;
+	}
+	return 0;
+}
+
 /**
  * \brief The callback function for mckernel procfs files.
  *
  * \param rarg returned argument
  */
-int process_procfs_request(struct ikc_scd_packet *rpacket)
+static int _process_procfs_request(struct ikc_scd_packet *rpacket, int *result)
 {
 	unsigned long rarg = rpacket->arg;
 	unsigned long parg, pbuf;
@@ -419,7 +436,17 @@ int process_procfs_request(struct ikc_scd_packet *rpacket)
 	if (strcmp(p, "maps") == 0) {
 		struct vm_range *range;
 
-		ihk_mc_spinlock_lock_noirq(&vm->memory_range_lock);
+		if (!ihk_mc_spinlock_trylock_noirq(&vm->memory_range_lock)) {
+			if (!result) {
+				if ((err = procfs_backlog(vm, rpacket))) {
+					goto err;
+				}
+			}
+			else {
+				*result = -EAGAIN;
+			}
+			goto out;
+		}
 
 		range = lookup_process_memory_range(vm, 0, -1);
 		while (range) {
@@ -455,14 +482,15 @@ int process_procfs_request(struct ikc_scd_packet *rpacket)
 
 			if (ans < 0 || ans > count ||
 			    buf_add(&buf_top, &buf_cur, buf, ans) < 0) {
-				ihk_mc_spinlock_unlock_noirq(&vm->memory_range_lock);
+				ihk_mc_spinlock_unlock_noirq(
+							&vm->memory_range_lock);
 				goto err;
 			}
 			range = next_process_memory_range(vm, range);
 		}
-		
+
 		ihk_mc_spinlock_unlock_noirq(&vm->memory_range_lock);
-		
+
 		ans = 0;
 		goto end;
 	}
@@ -483,8 +511,18 @@ int process_procfs_request(struct ikc_scd_packet *rpacket)
 
 		start = (offset / sizeof(uint64_t)) << PAGE_SHIFT;
 		end = start + ((count / sizeof(uint64_t)) << PAGE_SHIFT);
-		
-		ihk_mc_spinlock_lock_noirq(&vm->memory_range_lock);
+
+		if (!ihk_mc_spinlock_trylock_noirq(&vm->memory_range_lock)) {
+			if (!result) {
+				if ((err = procfs_backlog(vm, rpacket))) {
+					goto err;
+				}
+			}
+			else {
+				*result = -EAGAIN;
+			}
+			goto out;
+		}
 
 		while (start < end) {
 			*_buf = ihk_mc_pt_virt_to_pagemap(proc->vm->address_space->page_table, start);
@@ -495,7 +533,7 @@ int process_procfs_request(struct ikc_scd_packet *rpacket)
 		}
 
 		ihk_mc_spinlock_unlock_noirq(&vm->memory_range_lock);
-		
+
 		dprintf("/proc/pagemap: 0x%lx - 0x%lx, count: %d\n", 
 			start, end, count);
 		
@@ -526,14 +564,24 @@ int process_procfs_request(struct ikc_scd_packet *rpacket)
 			goto err;
 		}
 
-		ihk_mc_spinlock_lock_noirq(&proc->vm->memory_range_lock);
+		if (!ihk_mc_spinlock_trylock_noirq(&vm->memory_range_lock)) {
+			if (!result) {
+				if ((err = procfs_backlog(vm, rpacket))) {
+					goto err;
+				}
+			}
+			else {
+				*result = -EAGAIN;
+			}
+			goto out;
+		}
 		range = lookup_process_memory_range(vm, 0, -1);
 		while (range) {
 			if(range->flag & VR_LOCKED)
 				lockedsize += range->end - range->start;
 			range = next_process_memory_range(vm, range);
 		}
-		ihk_mc_spinlock_unlock_noirq(&proc->vm->memory_range_lock);
+		ihk_mc_spinlock_unlock_noirq(&vm->memory_range_lock);
 
 		cpu_bitmask = &bitmasks[bitmasks_offset];
 		bitmasks_offset += bitmap_scnprintf(cpu_bitmask,
@@ -786,6 +834,9 @@ end:
 	if (r->pbuf == PA_NULL && buf_top)
 		r->pbuf = virt_to_phys(buf_top);
 err:
+	send_procfs_answer(rpacket, err);
+
+out:
 	if (vbuf) {
 		ihk_mc_unmap_virtual(vbuf, npages);
 		ihk_mc_unmap_memory(NULL, pbuf, r->count);
@@ -807,3 +858,20 @@ err:
 
 	return err;
 }
+
+int process_procfs_request(struct ikc_scd_packet *rpacket)
+{
+	return _process_procfs_request(rpacket, NULL);
+}
+
+static int do_procfs_backlog(void *arg)
+{
+	struct ikc_scd_packet *rpacket = arg;
+	int result = 0;
+
+	_process_procfs_request(rpacket, &result);
+	if (!result) {
+		kfree(arg);
+	}
+	return result;
+}
diff --git a/test/issues/452/C452.patch b/test/issues/452/C452.patch
new file mode 100644
index 00000000..61acab59
--- /dev/null
+++ b/test/issues/452/C452.patch
@@ -0,0 +1,219 @@
+diff --git a/arch/arm64/kernel/include/syscall_list.h b/arch/arm64/kernel/include/syscall_list.h
+index 5dd6243..709231d 100644
+--- a/arch/arm64/kernel/include/syscall_list.h
++++ b/arch/arm64/kernel/include/syscall_list.h
+@@ -128,6 +128,8 @@ SYSCALL_HANDLED(731, util_indicate_clone)
+ SYSCALL_HANDLED(732, get_system)
+ SYSCALL_HANDLED(733, util_register_desc)
+ 
++SYSCALL_HANDLED(740, setkdebug)
++
+ /* McKernel Specific */
+ SYSCALL_HANDLED(801, swapout)
+ SYSCALL_HANDLED(802, linux_mlock)
+diff --git a/arch/x86_64/kernel/include/syscall_list.h b/arch/x86_64/kernel/include/syscall_list.h
+index 8ef9bd0..16361ea 100644
+--- a/arch/x86_64/kernel/include/syscall_list.h
++++ b/arch/x86_64/kernel/include/syscall_list.h
+@@ -170,6 +170,8 @@ SYSCALL_HANDLED(731, util_indicate_clone)
+ SYSCALL_HANDLED(732, get_system)
+ SYSCALL_HANDLED(733, util_register_desc)
+ 
++SYSCALL_HANDLED(740, setkdebug)
++
+ /* McKernel Specific */
+ SYSCALL_HANDLED(801, swapout)
+ SYSCALL_HANDLED(802, linux_mlock)
+diff --git a/kernel/include/process.h b/kernel/include/process.h
+index 32fb880..d45f734 100644
+--- a/kernel/include/process.h
++++ b/kernel/include/process.h
+@@ -575,6 +575,7 @@ struct process {
+ 	int process_rank; /* Rank in partition */
+ 	int coredump_barrier_count, coredump_barrier_count2;
+ 	mcs_rwlock_lock_t coredump_lock; // lock for coredump
++	int debug_flags;
+ };
+ 
+ /*
+diff --git a/kernel/procfs.c b/kernel/procfs.c
+index 277dbfe..ea78af3 100644
+--- a/kernel/procfs.c
++++ b/kernel/procfs.c
+@@ -445,6 +445,7 @@ static int _process_procfs_request(struct ikc_scd_packet *rpacket, int *result)
+ 			else {
+ 				*result = -EAGAIN;
+ 			}
++			kprintf("read /proc/*/maps %d\n", result? 1: 0);
+ 			goto out;
+ 		}
+ 
+@@ -521,6 +522,7 @@ static int _process_procfs_request(struct ikc_scd_packet *rpacket, int *result)
+ 			else {
+ 				*result = -EAGAIN;
+ 			}
++			kprintf("read /proc/*/pagemap %d\n", result? 1: 0);
+ 			goto out;
+ 		}
+ 
+@@ -573,6 +575,7 @@ static int _process_procfs_request(struct ikc_scd_packet *rpacket, int *result)
+ 			else {
+ 				*result = -EAGAIN;
+ 			}
++			kprintf("read /proc/*/status %d\n", result? 1: 0);
+ 			goto out;
+ 		}
+ 		range = lookup_process_memory_range(vm, 0, -1);
+diff --git a/kernel/syscall.c b/kernel/syscall.c
+index 7d4964e..6a9f3df 100644
+--- a/kernel/syscall.c
++++ b/kernel/syscall.c
+@@ -1651,6 +1651,18 @@ do_mmap(const uintptr_t addr0, const size_t len0, const int prot,
+ 	}
+ 
+ 	ihk_mc_spinlock_lock_noirq(&thread->vm->memory_range_lock);
++	if (thread->proc->debug_flags) {
++		// sleep 5 sec
++		unsigned long ts = rdtsc();
++		unsigned long nanosecs = 5000000000L;
++		unsigned long tscs = nanosecs * 1000 / ihk_mc_get_ns_per_tsc();
++
++		kprintf("kernel debug sleep 5sec...\n");
++		while (rdtsc() - ts < tscs) {
++			cpu_pause();
++		}
++		kprintf("kernel debug wake up\n");
++	}
+ 
+ 	if (flags & MAP_FIXED) {
+ 		/* clear specified address range */
+@@ -9617,6 +9629,17 @@ SYSCALL_DECLARE(util_register_desc)
+ 	return 0;
+ }
+ 
++SYSCALL_DECLARE(setkdebug)
++{
++	int flags = ihk_mc_syscall_arg0(ctx);
++	struct thread *mythread = cpu_local_var(current);
++	struct process *proc = mythread->proc;
++
++	kprintf("set kernel debug flag pid=%d val=%d\n", proc->pid, flags);
++	proc->debug_flags = flags;
++	return 0;
++}
++
+ void
+ reset_cputime()
+ {
+diff --git a/test/issues/452/C452.patch b/test/issues/452/C452.patch
+index 4393b4e..e69de29 100644
+--- a/test/issues/452/C452.patch
++++ b/test/issues/452/C452.patch
+@@ -1,107 +0,0 @@
+-diff --git a/arch/arm64/kernel/include/syscall_list.h b/arch/arm64/kernel/include/syscall_list.h
+-index 5dd6243..709231d 100644
+---- a/arch/arm64/kernel/include/syscall_list.h
+-+++ b/arch/arm64/kernel/include/syscall_list.h
+-@@ -128,6 +128,8 @@ SYSCALL_HANDLED(731, util_indicate_clone)
+- SYSCALL_HANDLED(732, get_system)
+- SYSCALL_HANDLED(733, util_register_desc)
+- 
+-+SYSCALL_HANDLED(740, setkdebug)
+-+
+- /* McKernel Specific */
+- SYSCALL_HANDLED(801, swapout)
+- SYSCALL_HANDLED(802, linux_mlock)
+-diff --git a/arch/x86_64/kernel/include/syscall_list.h b/arch/x86_64/kernel/include/syscall_list.h
+-index 8ef9bd0..16361ea 100644
+---- a/arch/x86_64/kernel/include/syscall_list.h
+-+++ b/arch/x86_64/kernel/include/syscall_list.h
+-@@ -170,6 +170,8 @@ SYSCALL_HANDLED(731, util_indicate_clone)
+- SYSCALL_HANDLED(732, get_system)
+- SYSCALL_HANDLED(733, util_register_desc)
+- 
+-+SYSCALL_HANDLED(740, setkdebug)
+-+
+- /* McKernel Specific */
+- SYSCALL_HANDLED(801, swapout)
+- SYSCALL_HANDLED(802, linux_mlock)
+-diff --git a/kernel/include/process.h b/kernel/include/process.h
+-index 32fb880..d45f734 100644
+---- a/kernel/include/process.h
+-+++ b/kernel/include/process.h
+-@@ -575,6 +575,7 @@ struct process {
+- 	int process_rank; /* Rank in partition */
+- 	int coredump_barrier_count, coredump_barrier_count2;
+- 	mcs_rwlock_lock_t coredump_lock; // lock for coredump
+-+	int debug_flags;
+- };
+- 
+- /*
+-diff --git a/kernel/procfs.c b/kernel/procfs.c
+-index 35d4778..615b7ac 100644
+---- a/kernel/procfs.c
+-+++ b/kernel/procfs.c
+-@@ -446,6 +446,7 @@ static int _process_procfs_request(struct ikc_scd_packet *rpacket, int *result)
+- 			else {
+- 				*result = -EAGAIN;
+- 			}
+-+			kprintf("read /proc/*/maps %d\n", result? 1: 0);
+- 			goto out;
+- 		}
+- 
+-@@ -522,6 +523,7 @@ static int _process_procfs_request(struct ikc_scd_packet *rpacket, int *result)
+- 			else {
+- 				*result = -EAGAIN;
+- 			}
+-+			kprintf("read /proc/*/pagemap %d\n", result? 1: 0);
+- 			goto out;
+- 		}
+- 
+-@@ -574,6 +576,7 @@ static int _process_procfs_request(struct ikc_scd_packet *rpacket, int *result)
+- 			else {
+- 				*result = -EAGAIN;
+- 			}
+-+			kprintf("read /proc/*/status %d\n", result? 1: 0);
+- 			goto out;
+- 		}
+- 		range = lookup_process_memory_range(vm, 0, -1);
+-diff --git a/kernel/syscall.c b/kernel/syscall.c
+-index 7d4964e..6a9f3df 100644
+---- a/kernel/syscall.c
+-+++ b/kernel/syscall.c
+-@@ -1651,6 +1651,18 @@ do_mmap(const uintptr_t addr0, const size_t len0, const int prot,
+- 	}
+- 
+- 	ihk_mc_spinlock_lock_noirq(&thread->vm->memory_range_lock);
+-+	if (thread->proc->debug_flags) {
+-+		// sleep 5 sec
+-+		unsigned long ts = rdtsc();
+-+		unsigned long nanosecs = 5000000000L;
+-+		unsigned long tscs = nanosecs * 1000 / ihk_mc_get_ns_per_tsc();
+-+
+-+		kprintf("kernel debug sleep 5sec...\n");
+-+		while (rdtsc() - ts < tscs) {
+-+			cpu_pause();
+-+		}
+-+		kprintf("kernel debug wake up\n");
+-+	}
+- 
+- 	if (flags & MAP_FIXED) {
+- 		/* clear specified address range */
+-@@ -9617,6 +9629,17 @@ SYSCALL_DECLARE(util_register_desc)
+- 	return 0;
+- }
+- 
+-+SYSCALL_DECLARE(setkdebug)
+-+{
+-+	int flags = ihk_mc_syscall_arg0(ctx);
+-+	struct thread *mythread = cpu_local_var(current);
+-+	struct process *proc = mythread->proc;
+-+
+-+	kprintf("set kernel debug flag pid=%d val=%d\n", proc->pid, flags);
+-+	proc->debug_flags = flags;
+-+	return 0;
+-+}
+-+
+- void
+- reset_cputime()
+- {
diff --git a/test/issues/452/C452.sh b/test/issues/452/C452.sh
new file mode 100644
index 00000000..79740270
--- /dev/null
+++ b/test/issues/452/C452.sh
@@ -0,0 +1,25 @@
+#!/bin/sh
+USELTP=1
+USEOSTEST=0
+
+. ../../common.sh
+
+################################################################################
+$MCEXEC ./C452T01
+
+for i in mmap01:02 mmap02:03 mmap03:04 mmap04:05 mmap12:06 brk01:07 fork01:08 \
+	 fork02:09 fork03:10 mremap04:11 mremap05:12 munmap01:13 shmat01:14 \
+	 shmdt01:15 mlock01:16 mlock04:17 execve01:18 exit01:19 exit02:20 \
+	 exit_group01:21 mprotect02:22 mprotect03:23 msync01:24 msync02:25 \
+	 munlock01:26 remap_file_pages01:27 remap_file_pages01:28; do
+	tp=`echo $i|sed 's/:.*//'`
+	id=`echo $i|sed 's/.*://'`
+	sudo PATH=$PATH:$LTPBIN $MCEXEC $LTPBIN/$tp 2>&1 | tee $tp.txt
+	ok=`grep TPASS $tp.txt | wc -l`
+	ng=`grep TFAIL $tp.txt | wc -l`
+	if [ $ng = 0 ]; then
+		echo "*** C452T$id: $tp PASS ($ok)"
+	else
+		echo "*** C452T$id: $tp FAIL (ok=$ok ng=%ng)"
+	fi
+done
diff --git a/test/issues/452/C452T01.c b/test/issues/452/C452T01.c
new file mode 100644
index 00000000..49e15d95
--- /dev/null
+++ b/test/issues/452/C452T01.c
@@ -0,0 +1,40 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <errno.h>
+
+int
+main(int argc, char **argv)
+{
+	pid_t pid;
+	int st;
+
+	fprintf(stderr, "*** C452T01 test start\n");
+	fflush(stderr);
+	pid = fork();
+	if (pid == 0) {
+		char file[32];
+
+		sleep(1);
+		sprintf(file, "/proc/%d/maps", getppid());
+		execlp("cat", "cat", file, NULL);
+		exit(1);
+	}
+	fflush(stdout);
+	if (syscall(740, 1) == -1) {
+		fprintf(stderr, "*** C452T01 FAIL no patched kernel\n");
+		exit(1);
+	}
+	mmap(NULL, 4096, PROT_READ|PROT_WRITE,
+	     MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+	syscall(740, 0);
+	while (waitpid(pid, &st, 0) == -1 && errno == EINTR)
+		;
+	fprintf(stderr, "*** C452T01 PASS\n");
+	exit(0);
+}
diff --git a/test/issues/452/C452_arm64.txt b/test/issues/452/C452_arm64.txt
index bc234e43..458be374 100644
--- a/test/issues/452/C452_arm64.txt
+++ b/test/issues/452/C452_arm64.txt
@@ -1,23 +1,26 @@
-Script started on Thu 26 Sep 2019 10:31:51 AM JST
+Script started on 2019-11-15 06:32:44+00:00
+bash-4.4$ uname -m
+aarch64
+bash-4.4$ make test
 gcc -g -Wall -o C452T01 C452T01.c
 sh ./C452.sh
 mcstop+release.sh ... done
-mcreboot.sh -c 1-6,29-34 -m 50G@0,50G@1 -r 1-6:0+29-34:28 -O ... done
+mcreboot.sh -c 2-7,10-15 -m 2G@0 ... done
 *** C452T01 test start
-000000400000-000000410000 r-xs 0 0:0 0
-000000410000-000000420000 r--s 0 0:0 0
-000000420000-000000430000 rw-s 0 0:0 0
-080000000000-080000020000 r-xs 0 0:0 0
-080000020000-080000030000 r--s 0 0:0 0
-080000030000-080000040000 rw-s 0 0:0 0
-0ffffffe0000-100000000000 rw-p 0 0:0 0
-100000000000-100000010000 r--s 0 0:0 0                  [vsyscall]
-100000010000-100000020000 r-xs 0 0:0 0                  [vdso]
-100000040000-1000001b0000 r-xp 0 0:0 0                  /usr/lib64/libc-2.17.so
-1000001b0000-1000001c0000 r--p 0 0:0 0                  /usr/lib64/libc-2.17.so
-1000001c0000-1000001d0000 rw-p 0 0:0 0                  /usr/lib64/libc-2.17.so
-1000001d0000-1000001e0000 rw-p 0 0:0 0
-3fffff800000-400000000000 rw-p 0 0:0 0                  [stack]
+000000400000-000000410000 r-xs 0 0:0 0			
+000000410000-000000420000 r--s 0 0:0 0			
+000000420000-000000430000 rw-s 0 0:0 0			
+080000000000-080000020000 r-xs 0 0:0 0			
+080000020000-080000030000 r--s 0 0:0 0			
+080000030000-080000040000 rw-s 0 0:0 0			
+0ffffffe0000-100000000000 rw-p 0 0:0 0			
+100000000000-100000010000 r--s 0 0:0 0			[vsyscall]
+100000010000-100000020000 r-xs 0 0:0 0			[vdso]
+100000030000-100000190000 r-xp 0 0:0 0			/usr/lib64/libc-2.28.so
+100000190000-1000001a0000 r--p 0 0:0 0			/usr/lib64/libc-2.28.so
+1000001a0000-1000001b0000 rw-p 0 0:0 0			/usr/lib64/libc-2.28.so
+1000001b0000-1000001c0000 rw-p 0 0:0 0			
+3fffff800000-400000000000 rw-p 0 0:0 0			[stack]
 *** C452T01 PASS
 mmap01      1  TPASS  :  Functionality of mmap() successful
 *** C452T02: mmap01 PASS (1)
@@ -27,33 +30,19 @@ mmap03      1  TPASS  :  mmap() functionality is correct
 *** C452T04: mmap03 PASS (1)
 mmap04      1  TPASS  :  Functionality of mmap() successful
 *** C452T05: mmap04 PASS (1)
-tst_test.c:1096: INFO: Timeout per run is 0h 05m 00s
-mmap12.c:103: INFO: All pages are present
-mmap12.c:127: PASS: File mapped properly
-
-Summary:
-passed   1
-failed   0
-skipped  0
-warnings 0
-*** C452T06: mmap12 PASS (0)
-tst_test.c:1096: INFO: Timeout per run is 0h 05m 00s
-brk01.c:67: PASS: brk() works fine
-
-Summary:
-passed   1
-failed   0
-skipped  0
-warnings 0
-*** C452T07: brk01 PASS (0)
-fork01      1  TPASS  :  fork() returned 9892
-fork01      2  TPASS  :  child pid and fork() return agree: 9892
+mmap12      1  TPASS  :  Functionality of mmap() successful
+*** C452T06: mmap12 PASS (1)
+brk01       1  TPASS  :  brk(543512330) returned 0, new size verified by sbrk
+*** C452T07: brk01 PASS (1)
+fork01      1  TPASS  :  fork() returned 4922
+fork01      2  TPASS  :  child pid and fork() return agree: 4922
 *** C452T08: fork01 PASS (2)
 fork02      0  TINFO  :  Inside parent
+fork02      0  TINFO  :  Inside child
 fork02      0  TINFO  :  exit status of wait 0
 fork02      1  TPASS  :  test 1 PASSED
 *** C452T09: fork02 PASS (1)
-fork03      0  TINFO  :  process id in parent of child from fork : 9979
+fork03      0  TINFO  :  process id in parent of child from fork : 5008
 fork03      1  TPASS  :  test 1 PASSED
 *** C452T10: fork03 PASS (1)
 mremap04    1  TPASS  :  mremap() failed, 'MREMAP_MAYMOVE flag unset', errno 12
@@ -68,18 +57,11 @@ mremap05    7  TPASS  :  mremap #2 value OK
 *** C452T12: mremap05 PASS (7)
 munmap01    1  TPASS  :  Functionality of munmap() successful
 *** C452T13: munmap01 PASS (1)
-tst_test.c:1096: INFO: Timeout per run is 0h 05m 00s
-shmat01.c:147: PASS: shmat() succeeded to attach NULL address
-shmat01.c:147: PASS: shmat() succeeded to attach aligned address
-shmat01.c:147: PASS: shmat() succeeded to attach unaligned address with SHM_RND
-shmat01.c:147: PASS: shmat() succeeded to attach aligned address with SHM_READONLY, and got SIGSEGV on write
-
-Summary:
-passed   4
-failed   0
-skipped  0
-warnings 0
-*** C452T14: shmat01 PASS (0)
+shmat01     1  TPASS  :  conditions and functionality are correct
+shmat01     2  TPASS  :  conditions and functionality are correct
+shmat01     3  TPASS  :  conditions and functionality are correct
+shmat01     4  TPASS  :  conditions and functionality are correct
+*** C452T14: shmat01 PASS (4)
 shmdt01     1  TPASS  :  shared memory detached correctly
 *** C452T15: shmdt01 PASS (1)
 mlock01     1  TPASS  :  mlock passed
@@ -87,29 +69,16 @@ mlock01     2  TPASS  :  mlock passed
 mlock01     3  TPASS  :  mlock passed
 mlock01     4  TPASS  :  mlock passed
 *** C452T16: mlock01 PASS (4)
-mlock04     0  TINFO  :  locked 40960 bytes from 0x1000001d0000
+mlock04     0  TINFO  :  locked 40960 bytes from 0x1000001b0000
 mlock04     1  TPASS  :  test succeeded.
 *** C452T17: mlock04 PASS (1)
-tst_test.c:1096: INFO: Timeout per run is 0h 05m 00s
-execve01_child.c:46: PASS: execve01_child executed
-
-Summary:
-passed   1
-failed   0
-skipped  0
-warnings 0
-*** C452T18: execve01 PASS (0)
+execl01_child    1  TPASS  :  execve01_child executed
+execve01    0  TINFO  :  Child process returned TPASS
+*** C452T18: execve01 PASS (2)
 exit01      1  TPASS  :  exit() test PASSED
 *** C452T19: exit01 PASS (1)
-tst_test.c:1096: INFO: Timeout per run is 0h 05m 00s
-exit02.c:59: PASS: File written by child read back correctly
-
-Summary:
-passed   1
-failed   0
-skipped  0
-warnings 0
-*** C452T20: exit02 PASS (0)
+exit02      1  TPASS  :  exit() test PASSED
+*** C452T20: exit02 PASS (1)
 exit_group01    1  TPASS  :  exit_group() succeeded
 *** C452T21: exit_group01 PASS (1)
 mprotect02    1  TPASS  :  got SIGSEGV as expected
@@ -133,5 +102,7 @@ remap_file_pages01    2  TPASS  :  Non-Linear /tmp/ file OK
 remap_file_pages01    1  TPASS  :  Non-Linear shm file OK
 remap_file_pages01    2  TPASS  :  Non-Linear /tmp/ file OK
 *** C452T28: remap_file_pages01 PASS (2)
+bash-4.4$ exit
+exit
 
-Script done on Thu 26 Sep 2019 10:32:32 AM JST
+Script done on 2019-11-15 06:33:24+00:00
diff --git a/test/issues/452/C452_x86_64.txt b/test/issues/452/C452_x86_64.txt
index 5125111e..97d70a64 100644
--- a/test/issues/452/C452_x86_64.txt
+++ b/test/issues/452/C452_x86_64.txt
@@ -1,8 +1,11 @@
-Script started on Wed Jul  3 13:39:36 2019
+Script started on Fri Nov 15 15:35:46 2019
+bash-4.2$ uname -m
+x86_64
 bash-4.2$ make test
+gcc -g -Wall -o C452T01 C452T01.c
 sh ./C452.sh
 mcstop+release.sh ... done
-mcreboot.sh -c 1-7,17-23,9-15,25-31 -m 10G@0,10G@1 ... done
+mcreboot.sh -c 1-7,9-15,17-23,25-31 -m 10G@0,10G@1 -r 1-7:0+9-15:8+17-23:16+25-31:24 ... done
 *** C452T01 test start
 000000400000-000000401000 r-xs 0 0:0 0			
 000000600000-000000601000 r--s 0 0:0 0			
@@ -10,17 +13,17 @@ mcreboot.sh -c 1-7,17-23,9-15,25-31 -m 10G@0,10G@1 ... done
 155555600000-155555622000 r-xs 0 0:0 0			
 155555821000-155555822000 r--s 0 0:0 0			
 155555822000-155555824000 rw-s 0 0:0 0			
-2aaaaa9f8000-2aaaaaa00000 rw-p 0 0:0 0			
+2aaaaa9fc000-2aaaaaa00000 rw-p 0 0:0 0			
 2aaaaaa00000-2aaaaaa02000 r-xs 0 0:0 0			[vdso]
 2aaaaaa02000-2aaaaaa03000 rw-p 0 0:0 0			
-2aaaaaa1a000-2aaaaaa1b000 rw-p 0 0:0 0			
-2aaaaaa1b000-2aaaaabde000 r-xp 0 0:0 0			/usr/lib64/libc-2.17.so
-2aaaaabde000-2aaaaaddd000 ---p 0 0:0 0			/usr/lib64/libc-2.17.so
-2aaaaaddd000-2aaaaade1000 r--p 0 0:0 0			/usr/lib64/libc-2.17.so
-2aaaaade1000-2aaaaade3000 rw-p 0 0:0 0			/usr/lib64/libc-2.17.so
-2aaaaade3000-2aaaaade8000 rw-p 0 0:0 0			
-2aaaaade8000-2aaaaadea000 rw-p 0 0:0 0			
-2aaaaadea000-2aaaaadeb000 rw-p 0 0:0 0			
+2aaaaaa1b000-2aaaaaa1c000 rw-p 0 0:0 0			
+2aaaaaa1c000-2aaaaabdf000 r-xp 0 0:0 0			/usr/lib64/libc-2.17.so
+2aaaaabdf000-2aaaaadde000 ---p 0 0:0 0			/usr/lib64/libc-2.17.so
+2aaaaadde000-2aaaaade2000 r--p 0 0:0 0			/usr/lib64/libc-2.17.so
+2aaaaade2000-2aaaaade4000 rw-p 0 0:0 0			/usr/lib64/libc-2.17.so
+2aaaaade4000-2aaaaade9000 rw-p 0 0:0 0			
+2aaaaade9000-2aaaaadeb000 rw-p 0 0:0 0			
+2aaaaadeb000-2aaaaadec000 rw-p 0 0:0 0			
 547fff800000-548000000000 rw-p 0 0:0 0			[stack]
 *** C452T01 PASS
 mmap01      1  TPASS  :  Functionality of mmap() successful
@@ -35,18 +38,75 @@ mmap12      1  TPASS  :  Functionality of mmap() successful
 *** C452T06: mmap12 PASS (1)
 brk01       1  TPASS  :  brk(8626060) returned 0, new size verified by sbrk
 *** C452T07: brk01 PASS (1)
-fork01      1  TPASS  :  fork() returned 19074
-fork01      2  TPASS  :  child pid and fork() return agree: 19074
+fork01      1  TPASS  :  fork() returned 25081
+fork01      2  TPASS  :  child pid and fork() return agree: 25081
 *** C452T08: fork01 PASS (2)
 fork02      0  TINFO  :  Inside parent
 fork02      0  TINFO  :  Inside child
 fork02      0  TINFO  :  exit status of wait 0
 fork02      1  TPASS  :  test 1 PASSED
 *** C452T09: fork02 PASS (1)
-fork03      0  TINFO  :  process id in parent of child from fork : 19223
+fork03      0  TINFO  :  process id in parent of child from fork : 25231
 fork03      1  TPASS  :  test 1 PASSED
 *** C452T10: fork03 PASS (1)
+mremap04    1  TPASS  :  mremap() failed, 'MREMAP_MAYMOVE flag unset', errno 12
+*** C452T11: mremap04 PASS (1)
+mremap05    1  TPASS  :  MREMAP_FIXED requires MREMAP_MAYMOVE
+mremap05    2  TPASS  :  new_addr has to be page aligned
+mremap05    3  TPASS  :  old/new area must not overlap
+mremap05    4  TPASS  :  mremap #1
+mremap05    5  TPASS  :  mremap #1 value OK
+mremap05    6  TPASS  :  mremap #2
+mremap05    7  TPASS  :  mremap #2 value OK
+*** C452T12: mremap05 PASS (7)
+munmap01    1  TPASS  :  Functionality of munmap() successful
+*** C452T13: munmap01 PASS (1)
+shmat01     1  TPASS  :  conditions and functionality are correct
+shmat01     2  TPASS  :  conditions and functionality are correct
+shmat01     3  TPASS  :  conditions and functionality are correct
+shmat01     4  TPASS  :  conditions and functionality are correct
+*** C452T14: shmat01 PASS (4)
+shmdt01     1  TPASS  :  shared memory detached correctly
+*** C452T15: shmdt01 PASS (1)
+mlock01     1  TPASS  :  mlock passed
+mlock01     2  TPASS  :  mlock passed
+mlock01     3  TPASS  :  mlock passed
+mlock01     4  TPASS  :  mlock passed
+*** C452T16: mlock01 PASS (4)
+mlock04     0  TINFO  :  locked 40960 bytes from 0x2aaaaadeb000
+mlock04     1  TPASS  :  test succeeded.
+*** C452T17: mlock04 PASS (1)
+execl01_child    1  TPASS  :  execve01_child executed
+execve01    0  TINFO  :  Child process returned TPASS
+*** C452T18: execve01 PASS (2)
+exit01      1  TPASS  :  exit() test PASSED
+*** C452T19: exit01 PASS (1)
+exit02      1  TPASS  :  exit() test PASSED
+*** C452T20: exit02 PASS (1)
+exit_group01    1  TPASS  :  exit_group() succeeded
+*** C452T21: exit_group01 PASS (1)
+mprotect02    1  TPASS  :  got SIGSEGV as expected
+mprotect02    2  TPASS  :  didn't get SIGSEGV
+*** C452T22: mprotect02 PASS (2)
+mprotect03    0  TINFO  :  received signal: SIGSEGV
+mprotect03    1  TPASS  :  SIGSEGV generated as expected
+*** C452T23: mprotect03 PASS (1)
+msync01     1  TPASS  :  Functionality of msync() successful
+*** C452T24: msync01 PASS (1)
+msync02     1  TPASS  :  Functionality of msync successful
+*** C452T25: msync02 PASS (1)
+munlock01    1  TPASS  :  test 0 passed length = 1
+munlock01    2  TPASS  :  test 1 passed length = 1024
+munlock01    3  TPASS  :  test 2 passed length = 1048576
+munlock01    4  TPASS  :  test 3 passed length = 10485760
+*** C452T26: munlock01 PASS (4)
+remap_file_pages01    1  TPASS  :  Non-Linear shm file OK
+remap_file_pages01    2  TPASS  :  Non-Linear /tmp/ file OK
+*** C452T27: remap_file_pages01 PASS (2)
+remap_file_pages01    1  TPASS  :  Non-Linear shm file OK
+remap_file_pages01    2  TPASS  :  Non-Linear /tmp/ file OK
+*** C452T28: remap_file_pages01 PASS (2)
 bash-4.2$ exit
 exit
 
-Script done on Wed Jul  3 13:39:53 2019
+Script done on Fri Nov 15 15:36:14 2019
diff --git a/test/issues/452/Makefile b/test/issues/452/Makefile
new file mode 100644
index 00000000..db3d5308
--- /dev/null
+++ b/test/issues/452/Makefile
@@ -0,0 +1,13 @@
+CC = gcc
+TARGET = C452T01
+
+all:: $(TARGET)
+
+C452T01: C452T01.c
+	$(CC) -g -Wall -o $@ $^
+
+test:: all
+	sh ./C452.sh
+
+clean::
+	rm -f $(TARGET) *.o
diff --git a/test/issues/452/README b/test/issues/452/README
new file mode 100644
index 00000000..b35b1c9f
--- /dev/null
+++ b/test/issues/452/README
@@ -0,0 +1,54 @@
+【Issue#452 動作確認】
+□ テスト内容
+1. Issue 指摘事項の再現確認
+   以下のパッチ (C452.patch) を McKernel に適用し、意図的に memory_range_lock の
+   競合を起こすことでテストを容易にする。
+   - mmap処理のmemory_range_lock取得中にsleep可能とする
+   - mmap処理のmemory_range_lock取得中にsleepするかどうかを制御する
+     システムコールを追加する
+   このパッチ適用カーネルを使ってテストする。
+
+C452T01 memory_range_lock 取得中に /proc/*/maps を参照し、PASS すること
+
+2. LTP を用いて既存処理に影響しないことを確認
+   メモリ関連処理を変更したため、関連するシステムコールのテストを選定した。
+C452T02 mmap01: mmap の基本機能の確認
+C452T03 mmap02: mmap の基本機能の確認
+C452T04 mmap03: mmap の基本機能の確認
+C452T05 mmap04: mmap の基本機能の確認
+C452T06 mmap12: mmap の基本機能の確認
+C452T07 brk01: brk の基本機能の確認
+C452T08 fork01: fork の基本機能の確認 (fork時メモリがコピーされる)
+C452T09 fork02: fork の基本機能の確認
+C452T10 fork03: fork の基本機能の確認
+C452T11 mremap04: mremap の基本機能の確認
+C452T12 mremap05: mremap の基本機能の確認
+C452T13 munmap01: munmap の基本機能の確認
+C452T14 shmat01: shmat の基本機能の確認
+C452T15 shmdt01: shmdt の基本機能の確認
+C452T16 mlock01: mlock の基本機能の確認
+C452T17 mlock04: mlock の基本機能の確認
+C452T18 execve01: execve の基本機能の確認 (exec時、メモリ解放がある)
+C452T19 exit01: exit の基本機能の確認 (exit時、メモリ解放がある)
+C452T20 exit02: exit の基本機能の確認 (exit時、メモリ解放がある)
+C452T21 exit_group01: exit_group の基本機能の確認 (exit時、メモリ解放がある)
+C452T22 mprotect02: mprotect の基本機能の確認
+C452T23 mprotect03: mprotect の基本機能の確認
+C452T24 msync01: msync の基本機能の確認
+C452T25 msync02: msync の基本機能の確認
+C452T26 munlock01: munlock の基本機能の確認
+C452T27 remap_file_pages01: remap_file_pages の基本機能の確認
+C452T28 remap_file_pages02: remap_file_pages の基本機能の確認
+
+□ 実行手順
+$ make test
+
+McKernelのインストール先や LTP の配置場所は、$HOME/.mck_test_config を
+参照する。.mck_test_config は、McKernel をビルドした際に生成される
+mck_test_config.sample ファイルを $HOME にコピーし、適宜編集すること。
+
+尚、テスト実行には C452.patch を適用した McKernel を使用すること。
+
+□ 実行結果
+C452_x86_64.txt(x86_64実行結果)、C452_arm64.txt(arm64実行結果)参照。
+全ての項目が PASS していることを確認。