diff --git a/scripts/build_symbol_table.py b/scripts/build_symbol_table.py
index 2095d34..516a072 100755
--- a/scripts/build_symbol_table.py
+++ b/scripts/build_symbol_table.py
@@ -19,15 +19,19 @@ def parse_syms(infile):
     representing the symbols in the text segment of the binary. Returns
     a list of (address, symbol_name)."""
 
-    from cxxfilt import demangle
+    from cxxfilt import demangle, InvalidName
 
     syms = []
     for line in sys.stdin:
         addr, t, mangled = line.split()
         if t not in "tTvVwW": continue
 
+        try:
+            name = demangle(mangled)
+        except InvalidName:
+            continue
+
         addr = int(addr, base=16)
-        name = demangle(mangled)
         syms.append((addr, name))
 
     return sorted(syms)
diff --git a/scripts/templates/build.ninja.j2 b/scripts/templates/build.ninja.j2
index 5ee5aca..8ab68b7 100644
--- a/scripts/templates/build.ninja.j2
+++ b/scripts/templates/build.ninja.j2
@@ -193,16 +193,12 @@ build $builddir/fatroot/nulldrv.elf : cp $builddir/user/nulldrv.elf
 build $builddir/fatroot/fb.elf : cp $builddir/user/fb.elf
     name = fb driver to FAT image
 
-build $builddir/fatroot/terminal.elf : cp $builddir/user/nulldrv.elf
-    name = terminal driver to FAT image
-
 build ${builddir}/fatroot/symbol_table.dat : makest ${builddir}/jsix.elf
 
 build $builddir/jsix.img : makefat | $
     $builddir/fatroot/symbol_table.dat $
     $builddir/fatroot/nulldrv.elf $
     $builddir/fatroot/fb.elf $
-    $builddir/fatroot/terminal.elf $
     $builddir/fatroot/jsix.elf $
     $builddir/fatroot/efi/boot/bootx64.efi
     name = jsix.img
diff --git a/src/boot/loader.cpp b/src/boot/loader.cpp
index 6d64972..94ef5c9 100644
--- a/src/boot/loader.cpp
+++ b/src/boot/loader.cpp
@@ -97,13 +97,8 @@ load_program(
 		void *src_start = offset_ptr<void>(data.data, pheader->offset);
 		void *dest_start = offset_ptr<void>(pages, pheader->vaddr - prog_base);
 		bs->copy_mem(dest_start, src_start, pheader->file_size);
-
-		console::print(L"    section %d phys: 0x%lx\r\n", i, pages);
-		console::print(L"    section %d virt: 0x%lx\r\n", i, pheader->vaddr);
 	}
 
-	console::print(L"    entrypoint:     0x%lx\r\n", header->entrypoint);
-
 	program.phys_addr = reinterpret_cast<uintptr_t>(pages);
 	program.size = total_size;
 	program.virt_addr = prog_base;
diff --git a/src/drivers/fb/scrollback.cpp b/src/drivers/fb/scrollback.cpp
index 170dd09..69aa017 100644
--- a/src/drivers/fb/scrollback.cpp
+++ b/src/drivers/fb/scrollback.cpp
@@ -8,7 +8,6 @@
 scrollback::scrollback(unsigned lines, unsigned cols, unsigned margin) :
 	m_rows {lines},
 	m_cols {cols},
-	m_start {0},
 	m_count {0},
 	m_margin {margin}
 {
@@ -23,24 +22,20 @@ scrollback::scrollback(unsigned lines, unsigned cols, unsigned margin) :
 void
 scrollback::add_line(const char *line, size_t len)
 {
-	unsigned i = 0;
-	if (m_count < m_rows)
-		i = m_count++;
-	else
-		i = m_start++;
+	unsigned i = m_count++ % m_rows;
 
 	if (len > m_cols)
 		len = m_cols;
 
-	memcpy(m_lines[i % m_rows], line, len);
+	memcpy(m_lines[i], line, len);
 	if (len < m_cols)
-		memset(m_lines[i % m_rows]+len, ' ', m_cols - len);
+		memset(m_lines[i]+len, ' ', m_cols - len);
 }
 
 char *
 scrollback::get_line(unsigned i)
 {
-	return m_lines[(i+m_start)%m_rows];
+	return m_lines[(i+m_count)%m_rows];
 }
 
 void
diff --git a/src/include/j6/types.h b/src/include/j6/types.h
index 15d762c..587775e 100644
--- a/src/include/j6/types.h
+++ b/src/include/j6/types.h
@@ -18,6 +18,7 @@ typedef uint64_t j6_signal_t;
 typedef uint64_t j6_tag_t;
 
 #define j6_tag_system_flag    0x8000000000000000
+#define j6_tag_invalid        0x0000000000000000
 
 /// If all high bits except the last 16 are set, then the tag represents
 /// an IRQ.
diff --git a/src/kernel/objects/process.cpp b/src/kernel/objects/process.cpp
index bf1f29f..aa82e19 100644
--- a/src/kernel/objects/process.cpp
+++ b/src/kernel/objects/process.cpp
@@ -21,13 +21,16 @@ process::process() :
 	m_state {state::running}
 {
 	s_processes.append(this);
+
+	j6_handle_t self = add_handle(this);
+	kassert(self == self_handle(), "Process self-handle is not 0");
 }
 
 // The "kernel process"-only constructor
 process::process(page_table *kpml4) :
 	kobject {kobject::type::process},
 	m_space {kpml4},
-	m_next_handle {0},
+	m_next_handle {self_handle()+1},
 	m_state {state::running}
 {
 }
@@ -117,6 +120,7 @@ process::thread_exited(thread *th)
 	kassert(&th->m_parent == this, "Process got thread_exited for non-child!");
 	uint32_t status = th->m_return_code;
 	m_threads.remove_swap(th);
+	remove_handle(th->self_handle());
 	delete th;
 
 	if (m_threads.count() == 0) {
diff --git a/src/kernel/objects/process.h b/src/kernel/objects/process.h
index fb7d2eb..14c8a8f 100644
--- a/src/kernel/objects/process.h
+++ b/src/kernel/objects/process.h
@@ -68,6 +68,9 @@ public:
 	/// \returns  True if this thread ending has ended the process
 	bool thread_exited(thread *th);
 
+	/// Get the handle for this process to refer to itself
+	inline j6_handle_t self_handle() const { return 0; }
+
 	/// Get the process object that owns kernel threads and the
 	/// kernel address space
 	static process & kernel_process();
diff --git a/src/kernel/objects/thread.cpp b/src/kernel/objects/thread.cpp
index 6a5b1ca..3eb6a9f 100644
--- a/src/kernel/objects/thread.cpp
+++ b/src/kernel/objects/thread.cpp
@@ -26,6 +26,8 @@ thread::thread(process &parent, uint8_t pri, uintptr_t rsp0) :
 		setup_kernel_stack();
 	else
 		m_tcb.rsp0 = rsp0;
+
+	m_self_handle = parent.add_handle(this);
 }
 
 thread::~thread()
diff --git a/src/kernel/objects/thread.h b/src/kernel/objects/thread.h
index 68e6257..41c0e7f 100644
--- a/src/kernel/objects/thread.h
+++ b/src/kernel/objects/thread.h
@@ -141,6 +141,9 @@ public:
 	/// \arg rip  The address to return to, must be user space
 	void add_thunk_user(uintptr_t rip);
 
+	/// Get the handle representing this thread to its process
+	j6_handle_t self_handle() const { return m_self_handle; }
+
 	/// Create the kernel idle thread
 	/// \arg kernel The process object that owns kernel tasks
 	/// \arg pri    The idle thread priority value
@@ -175,4 +178,6 @@ private:
 	uint64_t m_wait_data;
 	j6_status_t m_wait_result;
 	j6_koid_t m_wait_obj;
+
+	j6_handle_t m_self_handle;
 };
diff --git a/src/kernel/scheduler.cpp b/src/kernel/scheduler.cpp
index 5f89f25..b8e203f 100644
--- a/src/kernel/scheduler.cpp
+++ b/src/kernel/scheduler.cpp
@@ -116,11 +116,11 @@ load_process_image(uintptr_t phys, uintptr_t virt, size_t bytes, TCB *tcb)
 
 	initv = push<j6_init_value>(tcb->rsp3);
 	initv->type = j6_init_handle_process;
-	initv->value = static_cast<uint64_t>(proc.add_handle(&proc));
+	initv->value = static_cast<uint64_t>(proc.self_handle());
 
 	initv = push<j6_init_value>(tcb->rsp3);
 	initv->type = j6_init_handle_thread;
-	initv->value = static_cast<uint64_t>(proc.add_handle(&th));
+	initv->value = static_cast<uint64_t>(th.self_handle());
 
 	initv = push<j6_init_value>(tcb->rsp3);
 	initv->type = j6_init_handle_space;
diff --git a/src/kernel/syscalls/endpoint.cpp b/src/kernel/syscalls/endpoint.cpp
index 733bbb5..e4c9649 100644
--- a/src/kernel/syscalls/endpoint.cpp
+++ b/src/kernel/syscalls/endpoint.cpp
@@ -35,7 +35,12 @@ endpoint_receive(j6_handle_t handle, j6_tag_t *tag, size_t *len, void *data)
 	endpoint *e = get_handle<endpoint>(handle);
 	if (!e) return j6_err_invalid_arg;
 
-	return e->receive(tag, len, data);
+	j6_tag_t out_tag = j6_tag_invalid;
+	size_t out_len = 0;
+	j6_status_t s = e->receive(&out_tag, &out_len, data);
+	*tag = out_tag;
+	*len = out_len;
+	return s;
 }
 
 j6_status_t
@@ -51,7 +56,12 @@ endpoint_sendrecv(j6_handle_t handle, j6_tag_t *tag, size_t *len, void *data)
 	if (status != j6_status_ok)
 		return status;
 
-	return e->receive(tag, len, data);
+	j6_tag_t out_tag = j6_tag_invalid;
+	size_t out_len = 0;
+	j6_status_t s = e->receive(&out_tag, &out_len, data);
+	*tag = out_tag;
+	*len = out_len;
+	return s;
 }
 
 } // namespace syscalls
diff --git a/src/kernel/syscalls/thread.cpp b/src/kernel/syscalls/thread.cpp
index f1a0cad..49091b2 100644
--- a/src/kernel/syscalls/thread.cpp
+++ b/src/kernel/syscalls/thread.cpp
@@ -15,7 +15,7 @@ thread_create(void *rip, j6_handle_t *handle)
 
 	thread *child = p.create_thread();
 	child->add_thunk_user(reinterpret_cast<uintptr_t>(rip));
-	*handle = p.add_handle(child);
+	*handle = p.self_handle();
 	child->clear_state(thread::state::loading);
 	child->set_state(thread::state::ready);
 
diff --git a/src/libraries/kutil/include/kutil/map.h b/src/libraries/kutil/include/kutil/map.h
index 9536e61..4ea1ddf 100644
--- a/src/libraries/kutil/include/kutil/map.h
+++ b/src/libraries/kutil/include/kutil/map.h
@@ -45,20 +45,6 @@ struct hash_node
 	inline uint64_t hash() const { return h; }
 };
 
-template <typename V>
-struct hash_node <uint64_t, V>
-{
-	uint64_t key;
-	V val;
-
-	hash_node(hash_node &&o) : key(std::move(o.key)), val(std::move(o.val)) {}
-	hash_node(uint64_t h, uint64_t &&k, V &&v) : key(std::move(k)), val(std::move(v)) {}
-	~hash_node() {}
-
-	inline uint64_t & hash() { return key; }
-	inline uint64_t hash() const { return key; }
-};
-
 /// Base class for hash maps
 template <typename K, typename V>
 class base_map