From 00818b8447cfe3b87ba1d05a0741b8fc0eb94d8f Mon Sep 17 00:00:00 2001
From: Idan Horowitz <idan.horowitz@gmail.com>
Date: Fri, 6 Aug 2021 14:27:26 +0300
Subject: [PATCH] Kernel: Disable big process lock for sys$dump_backtrace()

This syscall only dumps the current thread's backtrace and as such
doesn't touch any shared intra-process resources.
---
 Kernel/API/Syscall.h      | 2 +-
 Kernel/Syscalls/debug.cpp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Kernel/API/Syscall.h b/Kernel/API/Syscall.h
index 034e18122d..b6fce51ec0 100644
--- a/Kernel/API/Syscall.h
+++ b/Kernel/API/Syscall.h
@@ -144,7 +144,7 @@ enum class NeedsBigProcessLock {
     S(reboot, NeedsBigProcessLock::Yes)                     \
     S(mount, NeedsBigProcessLock::Yes)                      \
     S(umount, NeedsBigProcessLock::Yes)                     \
-    S(dump_backtrace, NeedsBigProcessLock::Yes)             \
+    S(dump_backtrace, NeedsBigProcessLock::No)              \
     S(dbgputch, NeedsBigProcessLock::Yes)                   \
     S(dbgputstr, NeedsBigProcessLock::Yes)                  \
     S(create_inode_watcher, NeedsBigProcessLock::Yes)       \
diff --git a/Kernel/Syscalls/debug.cpp b/Kernel/Syscalls/debug.cpp
index 5df37e9c03..fcc8165251 100644
--- a/Kernel/Syscalls/debug.cpp
+++ b/Kernel/Syscalls/debug.cpp
@@ -13,7 +13,7 @@ namespace Kernel {
 
 KResultOr<FlatPtr> Process::sys$dump_backtrace()
 {
-    VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
+    VERIFY_NO_PROCESS_BIG_LOCK(this);
     dump_backtrace();
     return 0;
 }