diff --git a/Cargo.toml b/Cargo.toml
index 806b474..5d39115 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,3 +4,6 @@ members = ["lib/acpica-rs", "lib/kernel-common", "loader", "kernel"]
 
 [profile.release]
 lto = true
+
+[profile.dev]
+panic = "abort"
diff --git a/build.sh b/build.sh
index ba463fc..64ac156 100755
--- a/build.sh
+++ b/build.sh
@@ -1,15 +1,24 @@
 #!/bin/bash
 set -euo pipefail
+target=${OS_TARGET:-release}
 rm -rf img
 mkdir -p img/boot/efi/boot
 cd lib/acpica-build
 make -j4
 cd ../../kernel
-cargo build --release
+if [ "$target" = "release" ]; then
+  cargo build --release
+else
+  cargo build
+fi
 cd ../loader
-cargo build --release
+if [ "$target" = "release" ]; then
+  cargo build --release
+else
+  cargo build
+fi
 cd ..
-cp target/x86_64-unknown-uefi/release/loader.efi img/boot/efi/boot/bootx64.efi
+cp target/x86_64-unknown-uefi/$target/loader.efi img/boot/efi/boot/bootx64.efi
 cd img
 dd if=/dev/zero of=boot.img bs=1M count=16 status=none
 mformat -i boot.img
diff --git a/kernel/Cargo.toml b/kernel/Cargo.toml
index a4afae0..e5bf4e5 100644
--- a/kernel/Cargo.toml
+++ b/kernel/Cargo.toml
@@ -15,3 +15,6 @@ hashbrown = "0.15.2"
 kernel-common = {path = "../lib/kernel-common"}
 log = "0.4.22"
 spin = "0.9.8"
+
+[lints.clippy]
+missing_safety_doc = "allow"
diff --git a/kernel/src/cpu/isr.rs b/kernel/src/cpu/isr.rs
index ba5a81d..233ad47 100644
--- a/kernel/src/cpu/isr.rs
+++ b/kernel/src/cpu/isr.rs
@@ -9,7 +9,7 @@ use spin::Mutex;
 use crate::sys::{
     lapic::{get_current_lapic_id, send_eoi},
     scheduler::scheduler,
-    sync::{IN_ISR_HANDLER, LOCKS_HELD},
+    sync::{Spinlock, IN_ISR_HANDLER, LOCKS_HELD},
 };
 
 global_asm!(include_str!("isr.s"), options(att_syntax));
@@ -79,6 +79,7 @@ const EXCEPTIONS: [&str; 32] = [
 pub const ISR_INVALIDATE_TLB: u64 = 252;
 pub const ISR_SCHEDULER: u64 = 254;
 pub static ISR_HANDLERS: Mutex<[Option<fn()>; 256]> = Mutex::new([None; 256]);
+pub static ISR_HANDLERS_LOCK: Spinlock = Spinlock::new();
 
 #[no_mangle]
 extern "C" fn isr_handler(state: &mut ISRState) {
@@ -105,19 +106,21 @@ extern "C" fn isr_handler(state: &mut ISRState) {
     IN_ISR_HANDLER[lapic_id].store(true, Ordering::SeqCst);
     if state.isr == ISR_SCHEDULER {
         scheduler(state);
-        assert_eq!(LOCKS_HELD[lapic_id].load(Ordering::SeqCst), 0);
+        debug_assert_eq!(LOCKS_HELD[lapic_id].load(Ordering::SeqCst), 0);
         IN_ISR_HANDLER[lapic_id].store(false, Ordering::SeqCst);
         return;
     }
     let handler;
     {
+        ISR_HANDLERS_LOCK.lock();
         handler = ISR_HANDLERS.lock()[state.isr as usize];
+        ISR_HANDLERS_LOCK.unlock();
     }
     if let Some(handler) = handler {
         handler();
     } else {
         warn!("Unhandled interrupt: {}", state.isr);
     }
-    assert_eq!(LOCKS_HELD[lapic_id].load(Ordering::SeqCst), 0);
+    debug_assert_eq!(LOCKS_HELD[lapic_id].load(Ordering::SeqCst), 0);
     IN_ISR_HANDLER[lapic_id].store(false, Ordering::SeqCst);
 }
diff --git a/kernel/src/cpu/paging.rs b/kernel/src/cpu/paging.rs
index d1e6f43..8532b3b 100644
--- a/kernel/src/cpu/paging.rs
+++ b/kernel/src/cpu/paging.rs
@@ -5,7 +5,7 @@ use core::{
 };
 
 use alloc::{boxed::Box, vec::Vec};
-use bitvec::{bitvec, order::Lsb0, vec::BitVec};
+use bitvec::{order::Lsb0, vec::BitVec};
 use kernel_common::{
     loader_struct::LoaderStruct,
     paging::{load_cr3, PageEntry, PageTable, KERNEL_HEAP_INITIAL_SIZE, KERNEL_HEAP_START, KERNEL_VIRT_START},
@@ -191,7 +191,7 @@ pub unsafe fn unmap_physical(address: u64, size: u64) {
 pub fn setup_paging(loader_struct: &LoaderStruct, phys_start: u64, heap_start: u64) {
     HEAP_PHYS_START.store(heap_start, Ordering::SeqCst);
     let mut memory_size = 0;
-    for i in loader_struct.available_memory {
+    for i in &loader_struct.available_memory {
         if i.initial_page + i.page_count > memory_size {
             memory_size = i.initial_page + i.page_count;
         }
@@ -199,9 +199,9 @@ pub fn setup_paging(loader_struct: &LoaderStruct, phys_start: u64, heap_start: u
     info!("Memory size: {} MB", memory_size * 0x1000 / 1024 / 1024);
     {
         let mut frames_vec = PHYSICAL_FRAMES.lock();
-        *frames_vec = Some(bitvec![u64, Lsb0; 1; memory_size as usize]);
+        *frames_vec = Some(BitVec::<u64, Lsb0>::repeat(true, memory_size as usize));
         let frames_vec = frames_vec.as_mut().unwrap();
-        for i in loader_struct.available_memory {
+        for i in &loader_struct.available_memory {
             for j in 0..i.page_count {
                 let page = i.initial_page + j;
                 frames_vec.set(page as usize, false);
diff --git a/kernel/src/cpu/trampoline.s b/kernel/src/cpu/trampoline.s
index 65f8550..e1a079d 100644
--- a/kernel/src/cpu/trampoline.s
+++ b/kernel/src/cpu/trampoline.s
@@ -2,6 +2,7 @@
 .code16
 .align 0x1000
 
+.global ap_trampoline
 ap_trampoline:
   mov %cr4, %eax
   bts $5, %eax // Physical Address Extension
@@ -29,10 +30,12 @@ ap_trampoline_2:
   call *%rax
 
 .align 4
+.global trampoline_pml4
 trampoline_pml4:
 .int 0
 
 .align 8
+.global trampoline_stack
 trampoline_stack:
 .quad 0
 
diff --git a/kernel/src/main.rs b/kernel/src/main.rs
index f7f0c7f..bc0a0a1 100644
--- a/kernel/src/main.rs
+++ b/kernel/src/main.rs
@@ -30,7 +30,7 @@ use sys::{
     early_acpi::EarlyACPIHandler,
     hpet::setup_hpet,
     lapic::{get_current_lapic_id, setup_lapic_timer, smp_broadcast_panic, start_aps},
-    madt::parse_madt,
+    madt::{parse_madt, INTERRUPTS_SETUP},
     pic::disable_pic,
     sync::LOCKS_HELD,
     task::setup_multitasking,
@@ -108,8 +108,10 @@ fn main() {
 fn panic(info: &PanicInfo) -> ! {
     cli();
     if !BROADCASTED_PANIC.load(Ordering::SeqCst) {
-        smp_broadcast_panic();
-        LOCKS_HELD[get_current_lapic_id()].fetch_add(1, Ordering::SeqCst);
+        if INTERRUPTS_SETUP.load(Ordering::SeqCst) {
+            smp_broadcast_panic();
+            LOCKS_HELD[get_current_lapic_id()].fetch_add(1, Ordering::SeqCst);
+        }
         error!("{}", info);
         let str = format!("{}", info);
         display_print(&str);
diff --git a/kernel/src/misc/display.rs b/kernel/src/misc/display.rs
index d09d6d9..fa88f8e 100644
--- a/kernel/src/misc/display.rs
+++ b/kernel/src/misc/display.rs
@@ -16,7 +16,7 @@ use spin::Mutex;
 use crate::{
     cpu::paging::map_physical,
     misc::draw_target::FramebufferTarget,
-    sys::{sync::Spinlock, task::MULTITASKING_ENABLED},
+    sys::{madt::INTERRUPTS_SETUP, sync::Spinlock},
 };
 
 static FRAMEBUFFER: Mutex<Option<FramebufferTarget>> = Mutex::new(None);
@@ -57,7 +57,7 @@ pub fn display_print(str: &str) {
     if FRAMEBUFFER_ADDR.load(Ordering::SeqCst) == null_mut() {
         return;
     }
-    if MULTITASKING_ENABLED.load(Ordering::SeqCst) {
+    if INTERRUPTS_SETUP.load(Ordering::SeqCst) {
         FRAMEBUFFER_LOCK.lock();
     }
     let mut current_x = CURRENT_X.load(Ordering::SeqCst);
@@ -84,7 +84,7 @@ pub fn display_print(str: &str) {
     CURRENT_X.store(current_x, Ordering::SeqCst);
     CURRENT_Y.store(current_y, Ordering::SeqCst);
     copy_to_fb();
-    if MULTITASKING_ENABLED.load(Ordering::SeqCst) {
+    if INTERRUPTS_SETUP.load(Ordering::SeqCst) {
         FRAMEBUFFER_LOCK.unlock();
     }
 }
diff --git a/kernel/src/sys/ioapic.rs b/kernel/src/sys/ioapic.rs
index 6d8905a..1e7f74a 100644
--- a/kernel/src/sys/ioapic.rs
+++ b/kernel/src/sys/ioapic.rs
@@ -6,7 +6,10 @@ use core::{
 use bitfield::bitfield;
 
 use crate::{
-    cpu::{isr::ISR_HANDLERS, paging::map_physical},
+    cpu::{
+        isr::{ISR_HANDLERS, ISR_HANDLERS_LOCK},
+        paging::map_physical,
+    },
     sys::lapic::BSP_LAPIC_ID,
 };
 
@@ -82,7 +85,11 @@ pub fn set_irq_override(gsi: usize, vector: usize, polarity: u8, trigger: u8) {
 }
 pub fn register_irq_handler(vector: usize, handler: fn()) {
     assert!(ISR_HANDLERS.lock()[vector].is_none());
-    ISR_HANDLERS.lock()[vector] = Some(handler);
+    {
+        ISR_HANDLERS_LOCK.lock();
+        ISR_HANDLERS.lock()[vector] = Some(handler);
+        ISR_HANDLERS_LOCK.unlock();
+    }
     for i in 0..NEXT_IOAPIC_ID.load(Ordering::SeqCst) {
         let start = IOAPICS[i].start_gsi.load(Ordering::SeqCst);
         let end = IOAPICS[i].end_gsi.load(Ordering::SeqCst);
diff --git a/kernel/src/sys/lapic.rs b/kernel/src/sys/lapic.rs
index 128a360..8d2ef14 100644
--- a/kernel/src/sys/lapic.rs
+++ b/kernel/src/sys/lapic.rs
@@ -68,8 +68,7 @@ pub fn send_eoi() {
 pub fn get_current_lapic_id() -> usize {
     let address = ADDRESS.load(Ordering::SeqCst);
     let lapic_id = unsafe { address.add(REGISTER_ID).read_volatile() as usize >> 24 };
-    let rflags = get_rflags();
-    assert!(rflags & (1 << 9) == 0);
+    debug_assert!(get_rflags() & (1 << 9) == 0);
     lapic_id
 }
 pub fn setup_lapic(phys: u64) {
diff --git a/kernel/src/sys/madt.rs b/kernel/src/sys/madt.rs
index 33f5f7c..50e26b6 100644
--- a/kernel/src/sys/madt.rs
+++ b/kernel/src/sys/madt.rs
@@ -1,3 +1,5 @@
+use core::sync::atomic::{AtomicBool, Ordering};
+
 use acpi::{
     madt::{Madt, MadtEntry},
     AcpiTables,
@@ -10,6 +12,8 @@ use super::{
     lapic::{add_lapic, setup_lapic},
 };
 
+pub static INTERRUPTS_SETUP: AtomicBool = AtomicBool::new(false);
+
 pub fn parse_madt(tables: &AcpiTables<EarlyACPIHandler>) {
     let madt = tables.find_table::<Madt>().unwrap();
     let mut lapic_address: u64 = madt.local_apic_address as u64;
@@ -42,4 +46,5 @@ pub fn parse_madt(tables: &AcpiTables<EarlyACPIHandler>) {
     unsafe {
         sti();
     }
+    INTERRUPTS_SETUP.store(true, Ordering::SeqCst);
 }
diff --git a/kernel/src/sys/scheduler.rs b/kernel/src/sys/scheduler.rs
index 88c35e6..7fdcfea 100644
--- a/kernel/src/sys/scheduler.rs
+++ b/kernel/src/sys/scheduler.rs
@@ -1,17 +1,21 @@
 use core::{arch::asm, sync::atomic::Ordering};
 
 use alloc::{collections::vec_deque::VecDeque, vec::Vec};
-use kernel_common::instructions::cli;
 use spin::Mutex;
 
 use crate::cpu::isr::ISRState;
 
 use super::{
     lapic::{get_current_lapic_id, schedule_timer_interrupt},
-    sync::{Spinlock, IN_ISR_HANDLER, LOCKS_HELD},
+    sync::Spinlock,
     task::{switch_task, Task, TaskState, CURRENT_TASKS, CURRENT_TASK_LOCK, MULTITASKING_ENABLED},
 };
 
+#[cfg(debug_assertions)]
+use super::sync::{IN_ISR_HANDLER, LOCKS_HELD};
+#[cfg(debug_assertions)]
+use kernel_common::instructions::{cli, sti};
+
 static SCHEDULER_LIST: Mutex<VecDeque<Task>> = Mutex::new(VecDeque::new());
 pub static IDLE_TASKS: Mutex<Vec<Task>> = Mutex::new(Vec::new());
 pub static SCHEDULER_LOCK: Spinlock = Spinlock::new();
@@ -56,7 +60,7 @@ pub fn scheduler(state: &mut ISRState) {
     CURRENT_TASK_LOCK.unlock();
 }
 pub fn schedule_task(task: Task) {
-    assert!(SCHEDULER_LOCK.is_locked() || !MULTITASKING_ENABLED.load(Ordering::SeqCst));
+    debug_assert!(SCHEDULER_LOCK.is_locked() || !MULTITASKING_ENABLED.load(Ordering::SeqCst));
     let mut scheduler_list = SCHEDULER_LIST.lock();
     if scheduler_list.is_empty() {
         schedule_timer_interrupt();
@@ -64,11 +68,17 @@ pub fn schedule_task(task: Task) {
     scheduler_list.push_back(task);
 }
 pub fn yield_task() {
-    cli();
-    let lapic_id = get_current_lapic_id();
-    assert!(!IN_ISR_HANDLER[lapic_id].load(Ordering::SeqCst));
-    assert_eq!(LOCKS_HELD[lapic_id].load(Ordering::SeqCst), 0);
+    #[cfg(debug_assertions)]
+    {
+        cli();
+        let lapic_id = get_current_lapic_id();
+        debug_assert!(!IN_ISR_HANDLER[lapic_id].load(Ordering::SeqCst));
+        debug_assert_eq!(LOCKS_HELD[lapic_id].load(Ordering::SeqCst), 0);
+        unsafe {
+            sti();
+        }
+    }
     unsafe {
-        asm!("sti; int $254");
+        asm!("int $254");
     }
 }
diff --git a/kernel/src/sys/sync.rs b/kernel/src/sys/sync.rs
index d0ef8c0..1aab843 100644
--- a/kernel/src/sys/sync.rs
+++ b/kernel/src/sys/sync.rs
@@ -4,7 +4,7 @@ use alloc::{collections::vec_deque::VecDeque, sync::Arc};
 use kernel_common::instructions::{cli, sti};
 use spin::Mutex;
 
-use crate::sys::task::MULTITASKING_ENABLED;
+use crate::sys::madt::INTERRUPTS_SETUP;
 
 use super::{
     lapic::get_current_lapic_id,
@@ -34,7 +34,7 @@ impl Spinlock {
         }
     }
     pub fn lock(&self) {
-        assert!(MULTITASKING_ENABLED.load(Ordering::SeqCst));
+        debug_assert!(INTERRUPTS_SETUP.load(Ordering::SeqCst));
         cli();
         while !self.locked.compare_exchange(false, true, Ordering::SeqCst, Ordering::SeqCst).is_ok() {}
         let lapic_id = get_current_lapic_id();
@@ -42,8 +42,9 @@ impl Spinlock {
         self.lapic_id.store(lapic_id, Ordering::SeqCst);
     }
     pub fn unlock(&self) {
-        assert!(self.locked.load(Ordering::SeqCst));
+        debug_assert!(self.locked.load(Ordering::SeqCst));
         let lapic_id = self.lapic_id.load(Ordering::SeqCst);
+        debug_assert_eq!(lapic_id, get_current_lapic_id());
         self.locked.store(false, Ordering::SeqCst);
         LOCKS_HELD[lapic_id].fetch_sub(1, Ordering::SeqCst);
         if !IN_ISR_HANDLER[lapic_id].load(Ordering::SeqCst) && LOCKS_HELD[lapic_id].load(Ordering::SeqCst) == 0 {
@@ -109,7 +110,7 @@ pub fn unlock_semaphore(semaphore: Arc<Semaphore>, count: usize) {
     semaphore.spinlock.lock();
     {
         semaphore.current_count.fetch_add(count, Ordering::SeqCst);
-        assert!(semaphore.current_count.load(Ordering::SeqCst) <= semaphore.max_count);
+        debug_assert!(semaphore.current_count.load(Ordering::SeqCst) <= semaphore.max_count);
         while let Some(mut task) = semaphore.blocked_list.lock().pop_front() {
             task.block_on_semaphore = None;
             task.semaphore_requested_count = 0;
diff --git a/kernel/src/sys/task.rs b/kernel/src/sys/task.rs
index fd48f5c..6fdd36f 100644
--- a/kernel/src/sys/task.rs
+++ b/kernel/src/sys/task.rs
@@ -55,7 +55,7 @@ pub fn allocate_stack() -> u64 {
     stack.leak().as_mut_ptr() as u64 + STACK_SIZE as u64
 }
 pub fn switch_task(current_state: &mut ISRState, new_task: Task) {
-    assert!(CURRENT_TASK_LOCK.is_locked());
+    debug_assert!(CURRENT_TASK_LOCK.is_locked());
     let mut _current_task = CURRENT_TASKS.lock();
     if let Some(mut current_task) = _current_task.remove(&get_current_lapic_id()) {
         current_task.state = *current_state;
diff --git a/lib/kernel-common/Cargo.toml b/lib/kernel-common/Cargo.toml
index 9231b39..ea0774b 100644
--- a/lib/kernel-common/Cargo.toml
+++ b/lib/kernel-common/Cargo.toml
@@ -7,3 +7,6 @@ license = "Unlicense"
 [dependencies]
 bitfield = "0.17.0"
 log = "0.4.22"
+
+[lints.clippy]
+missing_safety_doc = "allow"
diff --git a/loader/Cargo.toml b/loader/Cargo.toml
index 733e6ac..33baddc 100644
--- a/loader/Cargo.toml
+++ b/loader/Cargo.toml
@@ -11,3 +11,6 @@ log = "0.4.22"
 raw-cpuid = "11.2.0"
 static-alloc = "0.2.5"
 uefi = "0.33.0"
+
+[lints.clippy]
+missing_safety_doc = "allow"
diff --git a/loader/src/main.rs b/loader/src/main.rs
index ebaeb44..2f53c71 100644
--- a/loader/src/main.rs
+++ b/loader/src/main.rs
@@ -39,6 +39,10 @@ mod paging;
 static ALLOC: Bump<[u8; 8 * 1024 * 1024]> = Bump::uninit();
 static BOOT_SERVICES_ACTIVE: AtomicBool = AtomicBool::new(false);
 
+#[cfg(debug_assertions)]
+const KERNEL: &[u8] = include_bytes!("../../target/x86_64-unknown-none/debug/kernel");
+
+#[cfg(not(debug_assertions))]
 const KERNEL: &[u8] = include_bytes!("../../target/x86_64-unknown-none/release/kernel");
 
 #[entry]