From b251c98a4e902cde25593796711cf7010eb27f86 Mon Sep 17 00:00:00 2001
From: Nick Bolton <nick@symless.com>
Date: Mon, 16 Mar 2026 11:42:59 +0000
Subject: [PATCH] fix: kill core orphan on gui death (linux)

---
 src/lib/gui/core/CoreProcess.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/lib/gui/core/CoreProcess.cpp b/src/lib/gui/core/CoreProcess.cpp
index a52127573..1e7a7a2ad 100644
--- a/src/lib/gui/core/CoreProcess.cpp
+++ b/src/lib/gui/core/CoreProcess.cpp
@@ -14,6 +14,11 @@
 #include "OSXHelpers.h"
 #endif
 
+#ifdef Q_OS_LINUX
+#include <signal.h>
+#include <sys/prctl.h>
+#endif
+
 #include <QCoreApplication>
 #include <QDir>
 #include <QFile>
@@ -203,6 +208,14 @@ void CoreProcess::startForegroundProcess(const QStringList &args)
   const auto quoted = makeQuotedArgs(m_appPath, args);
   qInfo("running command: %s", qPrintable(quoted));
 
+#ifdef Q_OS_LINUX
+  m_process->setChildProcessModifier([] {
+    // the core process becomes orphaned when the gui process exits abruptly (e.g. with kill -9),
+    // so ensure the os also kills the core when that happens to the gui.
+    prctl(PR_SET_PDEATHSIG, SIGTERM);
+  });
+#endif
+
   m_process->start(m_appPath, args);
 
   if (m_process->waitForStarted()) {