--- x/fs/proc/task_mmu.c
+++ t/fs/proc/task_mmu.c
@@ -277,7 +277,7 @@ show_map_vma(struct seq_file *m, struct
 	struct mm_struct *mm = vma->vm_mm;
 	struct file *file = vma->vm_file;
 	vm_flags_t flags = vma->vm_flags;
-	struct anon_vma_name *anon_name;
+	struct anon_vma_name *anon_name = NULL;
 	unsigned long ino = 0;
 	unsigned long long pgoff = 0;
 	unsigned long start, end;
@@ -294,7 +294,13 @@ show_map_vma(struct seq_file *m, struct
 	start = vma->vm_start;
 	end = vma->vm_end;
 	show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino);
-	anon_name = anon_vma_name(vma);
+	if (mm) {
+		if (mmap_read_lock_killable(mm))
+			goto done;
+		anon_name = anon_vma_name(vma);
+		anon_vma_name_get(anon_name);
+		mmap_read_unlock(mm);
+	}
 
 	/*
 	 * Print the dentry name for named mappings, and a
@@ -349,6 +355,7 @@ done:
 		seq_puts(m, name);
 	}
 	seq_putc(m, '\n');
+	anon_vma_name_put(anon_name);
 }
 
 static int show_map(struct seq_file *m, void *v)