[Lldb-commits] [lldb] [lldb][Process/FreeBSDKernelCore] Rework DoLoadCore() (PR #186626)

[Minsoo Choo via lldb-commits]

https://github.com/mchoo7 created https://github.com/llvm/llvm-project/pull/186626

Currently `ProcessFreeBSDKernelCore` is initialized and loads core at the same time by invoking `kvm_open2()` only once. But to implement minidump2elf based variant which inherits from `ProcessElfCore`, detecting and loading core file should be handled separately. Thus separate initialization and core load although the outcome is the same.

>From 822aa494d7ae9826f564822bc9594964a7b7a0c0 Mon Sep 17 00:00:00 2001
From: Minsoo Choo <minsoochoo0122 at proton.me>
Date: Sat, 14 Mar 2026 15:48:14 -0400
Subject: [PATCH] [lldb][Process/FreeBSDKernelCore] Rework DoLoadCore()

Signed-off-by: Minsoo Choo <minsoochoo0122 at proton.me>
---
 .../ProcessFreeBSDKernelCore.cpp              | 25 +++++++++++++++----
 .../ProcessFreeBSDKernelCore.h                |  2 +-
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/ProcessFreeBSDKernelCore.cpp b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/ProcessFreeBSDKernelCore.cpp
index d1a4a1ebc47d7..ad94c86e5499a 100644
--- a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/ProcessFreeBSDKernelCore.cpp
+++ b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/ProcessFreeBSDKernelCore.cpp
@@ -62,9 +62,8 @@ static PluginProperties &GetGlobalPluginProperties() {
 
 ProcessFreeBSDKernelCore::ProcessFreeBSDKernelCore(lldb::TargetSP target_sp,
                                                    ListenerSP listener_sp,
-                                                   kvm_t *kvm,
                                                    const FileSpec &core_file)
-    : PostMortemProcess(target_sp, listener_sp, core_file), m_kvm(kvm) {}
+    : PostMortemProcess(target_sp, listener_sp, core_file) {}
 
 ProcessFreeBSDKernelCore::~ProcessFreeBSDKernelCore() {
   if (m_kvm)
@@ -79,9 +78,11 @@ lldb::ProcessSP ProcessFreeBSDKernelCore::CreateInstance(
     kvm_t *kvm =
         kvm_open2(executable->GetFileSpec().GetPath().c_str(),
                   crash_file->GetPath().c_str(), O_RDONLY, nullptr, nullptr);
-    if (kvm)
+    if (kvm) {
+      kvm_close(kvm);
       return std::make_shared<ProcessFreeBSDKernelCore>(target_sp, listener_sp,
-                                                        kvm, *crash_file);
+                                                        *crash_file);
+    }
   }
   return nullptr;
 }
@@ -113,7 +114,21 @@ bool ProcessFreeBSDKernelCore::CanDebug(lldb::TargetSP target_sp,
 }
 
 Status ProcessFreeBSDKernelCore::DoLoadCore() {
-  // The core is already loaded by CreateInstance().
+  ModuleSP executable = GetTarget().GetExecutableModule();
+  if (!executable)
+    return Status::FromErrorString(
+        "ProcessFreeBSDKernelCore: no executable module set on target");
+
+  m_kvm = kvm_open2(executable->GetFileSpec().GetPath().c_str(),
+                    GetCoreFile().GetPath().c_str(), O_RDWR, nullptr, nullptr);
+
+  if (!m_kvm)
+    return Status::FromErrorStringWithFormat(
+        "ProcessFreeBSDKernelCore: kvm_open2 failed for core '%s' "
+        "with kernel '%s'",
+        GetCoreFile().GetPath().c_str(),
+        executable->GetFileSpec().GetPath().c_str());
+
   SetKernelDisplacement();
 
   return Status();
diff --git a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/ProcessFreeBSDKernelCore.h b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/ProcessFreeBSDKernelCore.h
index d82e55ea74bd9..77cb747fc95c1 100644
--- a/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/ProcessFreeBSDKernelCore.h
+++ b/lldb/source/Plugins/Process/FreeBSD-Kernel-Core/ProcessFreeBSDKernelCore.h
@@ -17,7 +17,7 @@
 class ProcessFreeBSDKernelCore : public lldb_private::PostMortemProcess {
 public:
   ProcessFreeBSDKernelCore(lldb::TargetSP target_sp, lldb::ListenerSP listener,
-                           kvm_t *kvm, const lldb_private::FileSpec &core_file);
+                           const lldb_private::FileSpec &core_file);
 
   ~ProcessFreeBSDKernelCore();