diff --git a/src/arch/x86_64/interrupt/exception.rs b/src/arch/x86_64/interrupt/exception.rs
index 09ba6d2..77b78f4 100644
--- a/src/arch/x86_64/interrupt/exception.rs
+++ b/src/arch/x86_64/interrupt/exception.rs
@@ -21,8 +21,6 @@ interrupt_stack!(divide_by_zero, |stack| {
 interrupt_stack!(debug, |stack| {
     let mut handled = false;
 
-    let guard = ptrace::set_process_regs(stack);
-
     // Disable singlestep before there is a breakpoint, since the breakpoint
     // handler might end up setting it again but unless it does we want the
     // default to be false.
@@ -36,8 +34,6 @@ interrupt_stack!(debug, |stack| {
         stack.set_singlestep(had_singlestep);
     }
 
-    drop(guard);
-
     if !handled {
         println!("Debug trap");
         stack.dump();
@@ -64,11 +60,7 @@ interrupt_stack!(breakpoint, |stack| {
     // int3 instruction. After all, it's the sanest thing to do.
     stack.iret.rip -= 1;
 
-    let guard = ptrace::set_process_regs(stack);
-
     if ptrace::breakpoint_callback(PTRACE_STOP_BREAKPOINT, None).is_none() {
-        drop(guard);
-
         println!("Breakpoint trap");
         stack.dump();
         ksignal(SIGTRAP);
diff --git a/src/arch/x86_64/interrupt/irq.rs b/src/arch/x86_64/interrupt/irq.rs
index b0856e8..cdac53d 100644
--- a/src/arch/x86_64/interrupt/irq.rs
+++ b/src/arch/x86_64/interrupt/irq.rs
@@ -190,7 +190,6 @@ interrupt_stack!(pit_stack, |stack| {
     timeout::trigger();
 
     if PIT_TICKS.fetch_add(1, Ordering::SeqCst) >= 10 {
-        let _guard = ptrace::set_process_regs(stack);
         let _ = context::switch();
     }
 });
diff --git a/src/arch/x86_64/paging/entry.rs b/src/arch/x86_64/paging/entry.rs
index 56f9755..ba6f941 100644
--- a/src/arch/x86_64/paging/entry.rs
+++ b/src/arch/x86_64/paging/entry.rs
@@ -77,3 +77,12 @@ impl Entry {
         self.0 = (self.0 & !COUNTER_MASK) | (count << 52);
     }
 }
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn entry_has_required_arch_alignment() {
+        use super::Entry;
+        assert!(core::mem::align_of::<Entry>() >= core::mem::align_of::<u64>(), "alignment of Entry is less than the required alignment of u64 ({} < {})", core::mem::align_of::<Entry>(), core::mem::align_of::<u64>());
+    }
+}
diff --git a/src/arch/x86_64/paging/table.rs b/src/arch/x86_64/paging/table.rs
index 9ebfcef..a6f45c5 100644
--- a/src/arch/x86_64/paging/table.rs
+++ b/src/arch/x86_64/paging/table.rs
@@ -55,7 +55,7 @@ impl<L> Table<L> where L: TableLevel {
     }
 
     pub fn zero(&mut self) {
-        for entry in self.entries.iter_mut() {
+        for entry in unsafe { &mut self.entries }.iter_mut() {
             entry.set_zero();
         }
     }
@@ -63,12 +63,12 @@ impl<L> Table<L> where L: TableLevel {
     /// Set number of entries in first table entry
     fn set_entry_count(&mut self, count: u64) {
         debug_assert!(count <= ENTRY_COUNT as u64, "count can't be greater than ENTRY_COUNT");
-        self.entries[0].set_counter_bits(count);
+        unsafe { &mut self.entries[0] }.set_counter_bits(count)
     }
 
     /// Get number of entries in first table entry
     fn entry_count(&self) -> u64 {
-        self.entries[0].counter_bits()
+        unsafe { &self.entries[0] }.counter_bits()
     }
 
     pub fn increment_entry_count(&mut self) {
@@ -118,12 +118,12 @@ impl<L> Index<usize> for Table<L> where L: TableLevel {
     type Output = Entry;
 
     fn index(&self, index: usize) -> &Entry {
-        &self.entries[index]
+        unsafe { &self.entries[index] }
     }
 }
 
 impl<L> IndexMut<usize> for Table<L> where L: TableLevel {
     fn index_mut(&mut self, index: usize) -> &mut Entry {
-        &mut self.entries[index]
+        unsafe { &mut self.entries[index] }
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 4df4412..e3cee27 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -275,5 +275,11 @@ pub extern fn ksignal(signal: usize) {
             println!("NAME {}", unsafe { ::core::str::from_utf8_unchecked(&context.name.lock()) });
         }
     }
-    syscall::exit(signal & 0x7F);
+
+    // Try running kill(getpid(), signal), but fallback to exiting
+    syscall::getpid()
+        .and_then(|pid| syscall::kill(pid, signal).map(|_| ()))
+        .unwrap_or_else(|_| {
+            syscall::exit(signal & 0x7F);
+        });
 }