From d9c3a39f13226cce43f54c4c074c2eda806c0196 Mon Sep 17 00:00:00 2001
From: Willow Barraco <contact@willowbarraco.fr>
Date: Mon, 09 Dec 2024 19:42:07 +0100
Subject: [PATCH] Fix crashes when triggering events count changes over time

epoll_pwait does not reset the epoll_events after the nevent index. It
means we are re-triggering events. In cases the events are obsoletes,
or the fd closed, we crash on:

    assert(pending & ~(op::READV | op::WRITEV) == 0)

We could cleanup the events integer ourselves, but this fix seems
better to me, and more performant anyway.

Signed-off-by: Willow Barraco <contact@willowbarraco.fr>

---
 ev/+linux/loop.ha | 2 +-

diff --git a/ev/+linux/loop.ha b/ev/+linux/loop.ha
index c62d04426b746065e172ef44bbbead970cfc7e6b..98ff45a9033d908eb041a133a1e83665a8253b44 100644
--- a/ev/+linux/loop.ha
+++ b/ev/+linux/loop.ha
@@ -152,7 +152,7 @@ 	if (nevent == 0) {
 		return true;
 	};
 
-	for (let ev &.. loop.events) {
+	for (let ev &.. loop.events[..nevent]) {
 		const file = ev.data.ptr: *file;
 		if (ev.events == 0) {
 			continue;

-- 
2.48.1