From 308461ca9ab407b0dab25e74565d56b29d179018 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Wed, 7 Aug 2019 20:35:41 +0200
Subject: [PATCH] Kernel: Disable kmalloc backtraces during backtrace
 generation

If kmalloc backtraces are enabled during backtracing, things don't go
super well when the backtrace code calls kmalloc()..

With this fixed, it's basically possible to get all kmalloc backtraces
on the debugger by running (as root):

sysctl kmalloc_stacks=1
---
 Kernel/KSyms.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Kernel/KSyms.cpp b/Kernel/KSyms.cpp
index ffe508d99a..77498f8daf 100644
--- a/Kernel/KSyms.cpp
+++ b/Kernel/KSyms.cpp
@@ -139,6 +139,7 @@ void dump_backtrace()
         return;
     }
     TemporaryChange change(in_dump_backtrace, true);
+    TemporaryChange disable_kmalloc_stacks(g_dump_kmalloc_stacks, false);
     u32 ebp;
     asm volatile("movl %%ebp, %%eax"
                  : "=a"(ebp));