From 9bb45ab3a6ffa86a12d32b81385141d9f99e2551 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 4 Apr 2022 16:52:32 +0200
Subject: [PATCH] Kernel: Add debug logging to learn more about unexpected NP
 faults

---
 Kernel/Memory/Region.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Kernel/Memory/Region.cpp b/Kernel/Memory/Region.cpp
index f12ad9d0c5a..b59eaa8247b 100644
--- a/Kernel/Memory/Region.cpp
+++ b/Kernel/Memory/Region.cpp
@@ -382,6 +382,12 @@ PageFaultResponse Region::handle_fault(PageFault const& fault)
             return PageFaultResponse::Continue;
         }
         dbgln("BUG! Unexpected NP fault at {}", fault.vaddr());
+        dbgln("     - Physical page slot pointer: {:p}", page_slot.ptr());
+        if (page_slot) {
+            dbgln("     - Physical page: {}", page_slot->paddr());
+            dbgln("     - Lazy committed: {}", page_slot->is_lazy_committed_page());
+            dbgln("     - Shared zero: {}", page_slot->is_shared_zero_page());
+        }
         return PageFaultResponse::ShouldCrash;
     }
     VERIFY(fault.type() == PageFault::Type::ProtectionViolation);