diff --git a/src/context/timeout.rs b/src/context/timeout.rs
index 43f5bc8bfe..9bf5c99095 100644
--- a/src/context/timeout.rs
+++ b/src/context/timeout.rs
@@ -76,6 +76,7 @@ pub fn trigger(token: &mut CleanLockToken) {
         } else {
             break;
         };
-        event::trigger(timeout.scheme_id, timeout.event_id, EVENT_READ);
+        drop(registry);
+        event::trigger(timeout.scheme_id, timeout.event_id, EVENT_READ, token);
     }
 }
diff --git a/src/event.rs b/src/event.rs
index 9342fcd0f8..918fa3e8c2 100644
--- a/src/event.rs
+++ b/src/event.rs
@@ -78,7 +78,7 @@ impl EventQueue {
 
             let flags = sync(RegKey { scheme, number }, token)?;
             if !flags.is_empty() {
-                trigger(scheme, number, flags);
+                trigger(scheme, number, flags, token);
             }
         }
 
@@ -215,13 +215,10 @@ fn trigger_inner(
     }
 }
 
-pub fn trigger(scheme: SchemeId, number: usize, flags: EventFlags) {
-    //TODO: propagate this lock token
-    let mut token = unsafe { CleanLockToken::new() };
-
+pub fn trigger(scheme: SchemeId, number: usize, flags: EventFlags, token: &mut CleanLockToken) {
     // First trigger with the original file
     let mut todo = Vec::new();
-    trigger_inner(scheme, number, flags, &mut todo, &mut token);
+    trigger_inner(scheme, number, flags, &mut todo, token);
 
     // Handle triggers on queues
     //TODO: can this be done with limited allocations?
@@ -233,7 +230,7 @@ pub fn trigger(scheme: SchemeId, number: usize, flags: EventFlags) {
                 queue_id.into(),
                 EventFlags::EVENT_READ,
                 &mut todo,
-                &mut token,
+                token,
             );
             done.insert(queue_id);
         }
diff --git a/src/ptrace.rs b/src/ptrace.rs
index 4bd414cc56..0a62fb422c 100644
--- a/src/ptrace.rs
+++ b/src/ptrace.rs
@@ -28,13 +28,13 @@ pub struct SessionData {
     file_id: usize,
 }
 impl SessionData {
-    fn add_event(&mut self, event: PtraceEvent) {
+    fn add_event(&mut self, event: PtraceEvent, token: &mut CleanLockToken) {
         self.events.push_back(event);
 
         // Notify nonblocking tracers
         if self.events.len() == 1 {
             // If the list of events was previously empty, alert now
-            proc_trigger_event(self.file_id, EVENT_READ);
+            proc_trigger_event(self.file_id, EVENT_READ, token);
         }
     }
 
@@ -119,12 +119,12 @@ pub fn close_tracee(session: &Session, token: &mut CleanLockToken) {
     session.tracer.notify(token);
 
     let data = session.data.lock();
-    proc_trigger_event(data.file_id, EVENT_READ);
+    proc_trigger_event(data.file_id, EVENT_READ, token);
 }
 
 /// Trigger a notification to the event: scheme
-fn proc_trigger_event(file_id: usize, flags: EventFlags) {
-    event::trigger(GlobalSchemes::Proc.scheme_id(), file_id, flags);
+fn proc_trigger_event(file_id: usize, flags: EventFlags, token: &mut CleanLockToken) {
+    event::trigger(GlobalSchemes::Proc.scheme_id(), file_id, flags, token);
 }
 
 /// Dispatch an event to any tracer tracing `self`. This will cause
@@ -140,7 +140,7 @@ pub fn send_event(event: PtraceEvent, token: &mut CleanLockToken) -> Option<()>
     }
 
     // Add event to queue
-    data.add_event(event);
+    data.add_event(event, token);
     // Notify tracer
     session.tracer.notify(token);
 
@@ -219,7 +219,7 @@ pub fn breakpoint_callback(
             .reached = true;
 
         // Add event to queue
-        data.add_event(event.unwrap_or(ptrace_event!(match_flags)));
+        data.add_event(event.unwrap_or(ptrace_event!(match_flags)), token);
 
         // Wake up sleeping tracer
         session.tracer.notify(token);
diff --git a/src/scheme/acpi.rs b/src/scheme/acpi.rs
index dfee8efd0f..e9539112d2 100644
--- a/src/scheme/acpi.rs
+++ b/src/scheme/acpi.rs
@@ -3,7 +3,7 @@ use core::{
     sync::atomic::{self, AtomicUsize},
 };
 
-use alloc::boxed::Box;
+use alloc::{boxed::Box, vec::Vec};
 
 use hashbrown::{hash_map::DefaultHashBuilder, HashMap};
 use spin::{Mutex, Once};
@@ -61,13 +61,17 @@ pub fn register_kstop(token: &mut CleanLockToken) -> bool {
     *KSTOP_FLAG.lock() = true;
     let mut waiters_awoken = KSTOP_WAITCOND.notify(token);
 
-    let handles = HANDLES.read(token.token());
+    let fds: Vec<usize> = {
+        HANDLES
+            .read(token.token())
+            .iter()
+            .filter(|(_, handle)| handle.kind == HandleKind::ShutdownPipe)
+            .map(|(fd, _)| *fd)
+            .collect()
+    };
 
-    for (&fd, _) in handles
-        .iter()
-        .filter(|(_, handle)| handle.kind == HandleKind::ShutdownPipe)
-    {
-        event::trigger(GlobalSchemes::Acpi.scheme_id(), fd, EVENT_READ);
+    for fd in fds {
+        event::trigger(GlobalSchemes::Acpi.scheme_id(), fd, EVENT_READ, token);
         waiters_awoken += 1;
     }
 
diff --git a/src/scheme/debug.rs b/src/scheme/debug.rs
index 8491b55589..7909a501eb 100644
--- a/src/scheme/debug.rs
+++ b/src/scheme/debug.rs
@@ -33,8 +33,9 @@ pub fn debug_input(data: u8, token: &mut CleanLockToken) {
 
 // Notify readers of input updates
 pub fn debug_notify(token: &mut CleanLockToken) {
-    for (id, _handle) in HANDLES.read(token.token()).iter() {
-        event::trigger(GlobalSchemes::Debug.scheme_id(), *id, EVENT_READ);
+    let ids: Vec<usize> = { HANDLES.read(token.token()).iter().map(|x| *x.0).collect() };
+    for id in ids {
+        event::trigger(GlobalSchemes::Debug.scheme_id(), id, EVENT_READ, token);
     }
 }
 
diff --git a/src/scheme/irq.rs b/src/scheme/irq.rs
index 630143f36c..6fd8bc5c73 100644
--- a/src/scheme/irq.rs
+++ b/src/scheme/irq.rs
@@ -61,14 +61,18 @@ const INO_PHANDLE: u64 = 0x8003_0000_0000_0000;
 /// Add to the input queue
 pub fn irq_trigger(irq: u8, token: &mut CleanLockToken) {
     COUNTS.lock()[irq as usize] += 1;
+    let fds: Vec<usize> = {
+        HANDLES
+            .read(token.token())
+            .iter()
+            .filter_map(|(fd, handle)| Some((fd, handle.as_irq_handle()?)))
+            .filter(|&(_, (_, handle_irq))| handle_irq == irq)
+            .map(|(f, _)| *f)
+            .collect()
+    };
 
-    for (fd, _) in HANDLES
-        .read(token.token())
-        .iter()
-        .filter_map(|(fd, handle)| Some((fd, handle.as_irq_handle()?)))
-        .filter(|&(_, (_, handle_irq))| handle_irq == irq)
-    {
-        event::trigger(GlobalSchemes::Irq.scheme_id(), *fd, EVENT_READ);
+    for fd in fds {
+        event::trigger(GlobalSchemes::Irq.scheme_id(), fd, EVENT_READ, token);
     }
 }
 
diff --git a/src/scheme/pipe.rs b/src/scheme/pipe.rs
index 0f4ef74ce2..e2128f89e3 100644
--- a/src/scheme/pipe.rs
+++ b/src/scheme/pipe.rs
@@ -123,13 +123,13 @@ impl KernelScheme for PipeScheme {
 
         let can_remove = if is_write_not_read {
             pipe.writer_is_alive.store(false, Ordering::SeqCst);
-            event::trigger(scheme_id, key, EVENT_READ);
+            event::trigger(scheme_id, key, EVENT_READ, token);
             pipe.read_condition.notify(token);
 
             !pipe.reader_is_alive.load(Ordering::SeqCst)
         } else {
             pipe.reader_is_alive.store(false, Ordering::SeqCst);
-            event::trigger(scheme_id, key | WRITE_NOT_READ_BIT, EVENT_WRITE);
+            event::trigger(scheme_id, key | WRITE_NOT_READ_BIT, EVENT_WRITE, token);
             pipe.write_condition.notify(token);
 
             !pipe.writer_is_alive.load(Ordering::SeqCst)
@@ -257,6 +257,7 @@ impl KernelScheme for PipeScheme {
                     GlobalSchemes::Pipe.scheme_id(),
                     key | WRITE_NOT_READ_BIT,
                     EVENT_WRITE,
+                    token,
                 );
                 pipe.write_condition.notify(token);
 
@@ -319,7 +320,7 @@ impl KernelScheme for PipeScheme {
             }
 
             if bytes_written > 0 {
-                event::trigger(GlobalSchemes::Pipe.scheme_id(), key, EVENT_READ);
+                event::trigger(GlobalSchemes::Pipe.scheme_id(), key, EVENT_READ, token);
                 pipe.read_condition.notify(token);
 
                 return Ok(bytes_written);
@@ -390,7 +391,7 @@ impl KernelScheme for PipeScheme {
             let fds_written = vec.len() - before_len;
 
             if fds_written > 0 {
-                event::trigger(GlobalSchemes::Pipe.scheme_id(), key, EVENT_READ);
+                event::trigger(GlobalSchemes::Pipe.scheme_id(), key, EVENT_READ, token);
                 pipe.read_condition.notify(token);
 
                 return Ok(fds_written);
@@ -454,6 +455,7 @@ impl KernelScheme for PipeScheme {
                     GlobalSchemes::Pipe.scheme_id(),
                     key | WRITE_NOT_READ_BIT,
                     EVENT_WRITE,
+                    token,
                 );
                 pipe.write_condition.notify(token);
 
diff --git a/src/scheme/serio.rs b/src/scheme/serio.rs
index 5aeb1fb146..5fdcd8b47d 100644
--- a/src/scheme/serio.rs
+++ b/src/scheme/serio.rs
@@ -42,8 +42,16 @@ pub fn serio_input(index: usize, data: u8, token: &mut CleanLockToken) {
 
     INPUT[index].send(data, token);
 
-    for (id, _handle) in HANDLES.read(token.token()).iter() {
-        event::trigger(GlobalSchemes::Serio.scheme_id(), *id, EVENT_READ);
+    let ids: Vec<usize> = {
+        HANDLES
+            .read(token.token())
+            .iter()
+            .map(|(id, _)| *id)
+            .collect()
+    };
+
+    for id in ids {
+        event::trigger(GlobalSchemes::Serio.scheme_id(), id, EVENT_READ, token);
     }
 }
 
diff --git a/src/scheme/user.rs b/src/scheme/user.rs
index 23e0725916..2cf843fc47 100644
--- a/src/scheme/user.rs
+++ b/src/scheme/user.rs
@@ -169,7 +169,7 @@ impl UserInner {
         unsafe { self.todo.condition.notify_signal(token) };
 
         // Tell the scheme handler to read
-        event::trigger(self.root_id, self.scheme_id.get(), EVENT_READ);
+        event::trigger(self.root_id, self.scheme_id.get(), EVENT_READ, token);
 
         //TODO: wait for all todo and done to be processed?
         Ok(())
@@ -251,7 +251,7 @@ impl UserInner {
             }
             self.todo.send(sqe, token);
 
-            event::trigger(self.root_id, self.scheme_id.get(), EVENT_READ);
+            event::trigger(self.root_id, self.scheme_id.get(), EVENT_READ, token);
         }
 
         loop {
@@ -345,7 +345,7 @@ impl UserInner {
                                 },
                                 token,
                             );
-                            event::trigger(self.root_id, self.scheme_id.get(), EVENT_READ);
+                            event::trigger(self.root_id, self.scheme_id.get(), EVENT_READ, token);
 
                             // 1. If cancellation was requested and arrived
                             // before the scheme processed the request, an
@@ -758,7 +758,7 @@ impl UserInner {
             },
             token,
         );
-        event::trigger(self.root_id, self.scheme_id.get(), EVENT_READ);
+        event::trigger(self.root_id, self.scheme_id.get(), EVENT_READ, token);
 
         Ok(())
     }
@@ -889,7 +889,7 @@ impl UserInner {
                 }
             }
             ParsedCqe::TriggerFevent { number, flags } => {
-                event::trigger(self.scheme_id, number, flags)
+                event::trigger(self.scheme_id, number, flags, token)
             }
         }
         Ok(())
@@ -1574,7 +1574,12 @@ impl KernelScheme for UserScheme {
             token,
         );
 
-        event::trigger(self.inner.root_id, self.inner.scheme_id.get(), EVENT_READ);
+        event::trigger(
+            self.inner.root_id,
+            self.inner.scheme_id.get(),
+            EVENT_READ,
+            token,
+        );
 
         Ok(())
     }
diff --git a/src/syscall/process.rs b/src/syscall/process.rs
index 1cd89f54c5..8ea1f7638d 100644
--- a/src/syscall/process.rs
+++ b/src/syscall/process.rs
@@ -60,6 +60,7 @@ pub fn exit_this_context(excp: Option<syscall::Exception>, token: &mut CleanLock
             GlobalSchemes::Proc.scheme_id(),
             owner.get(),
             EventFlags::EVENT_READ,
+            token,
         );
     }
     {