# --- T2-COPYRIGHT-BEGIN ---
# t2/package/*/alacritty/hotfix-ia64-stack.patch.ia64
# Copyright (C) 2026 The T2 SDE Project
# SPDX-License-Identifier: GPL-2.0 or patched project license
# --- T2-COPYRIGHT-END ---

Move the 1 MiB PTY read buffer off the thread stack and onto the heap.

The "PTY reader" thread is spawned with the default stack size and placed a
1 MiB array (READ_BUFFER_SIZE = 0x10_0000) directly on its stack. On IA-64
the thread stack is shared between the conventional memory stack and the RSE
register backing store, roughly halving the usable stack, so this frame
overflows the guard page. The fault surfaces at the first local written
(State::default -> VecDeque::new) and shows up as a SIGSEGV. Heap-allocating
the buffer removes it from the frame and fixes the crash on all targets.

--- alacritty-0.17.0.orig/alacritty_terminal/src/event_loop.rs
+++ alacritty-0.17.0/alacritty_terminal/src/event_loop.rs
@@ -205,7 +205,7 @@
     pub fn spawn(mut self) -> JoinHandle<(Self, State)> {
         thread::spawn_named("PTY reader", move || {
             let mut state = State::default();
-            let mut buf = [0u8; READ_BUFFER_SIZE];
+            let mut buf = vec![0u8; READ_BUFFER_SIZE].into_boxed_slice();
 
             let poll_opts = PollMode::Level;
             let mut interest = PollingEvent::readable(0);