From 0f03a8aecee85456f149310208c7e105a49c9391 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sun, 22 Aug 2021 12:26:42 +0200
Subject: [PATCH] Kernel: Add VERIFY(!m_in_block) when entering Thread::block()

---
 Kernel/Thread.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Kernel/Thread.h b/Kernel/Thread.h
index 608483ae1d..8db75a7379 100644
--- a/Kernel/Thread.h
+++ b/Kernel/Thread.h
@@ -855,6 +855,7 @@ public:
         SpinlockLocker block_lock(m_block_lock);
         // We need to hold m_block_lock so that nobody can unblock a blocker as soon
         // as it is constructed and registered elsewhere
+        VERIFY(!m_in_block);
         m_in_block = true;
         BlockerType blocker(forward<Args>(args)...);