From 3d459bf28d78348fa8547311fc4b70fc18f67ca2 Mon Sep 17 00:00:00 2001
From: XMuli <xmulitech@gmail.com>
Date: Sat, 4 Jan 2025 20:17:46 +0800
Subject: [PATCH] chore: Failed to create instance

Sometimes Ubuntu20.04-24.04 execution of `d->memory->attach()` crashes here
and prints the necessary information to determine that the creation has failed
---
 singleapplication.cpp | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/singleapplication.cpp b/singleapplication.cpp
index 95c4d18..e7b7f03 100644
--- a/singleapplication.cpp
+++ b/singleapplication.cpp
@@ -72,8 +72,9 @@ SingleApplication::SingleApplication( int &argc, char *argv[], bool allowSeconda
 #else
     d->memory = new QSharedMemory( d->blockServerName );
 #endif
-    d->memory->attach();
-    delete d->memory;
+    bool ok = d->memory->attach();
+    qCritical() << "d->memory->attach():" << ok;
+    if (ok) delete d->memory;
 #endif
     // Guarantee thread safe behaviour with a shared memory block.
 #if QT_VERSION >= QT_VERSION_CHECK(6, 6, 0)
@@ -91,16 +92,24 @@ SingleApplication::SingleApplication( int &argc, char *argv[], bool allowSeconda
         }
         d->initializeMemoryBlock();
     } else {
+
+        qCritical() << "Shared memory creation failed:" << d->memory->errorString();
+
         if( d->memory->error() == QSharedMemory::AlreadyExists ){
           // Attempt to attach to the memory segment
           if( ! d->memory->attach() ){
               qCritical() << "SingleApplication: Unable to attach to shared memory block.";
               abortSafely();
+          } else {
+              qCritical() << "Successfully attached to existing shared memory block";
           }
           if( ! d->memory->lock() ){
             qCritical() << "SingleApplication: Unable to lock memory block after attach.";
             abortSafely();
+          } else {
+            qCritical() << "Memory block successfully locked";
           }
+
         } else {
           qCritical() << "SingleApplication: Unable to create block.";
           abortSafely();
@@ -108,6 +117,21 @@ SingleApplication::SingleApplication( int &argc, char *argv[], bool allowSeconda
     }
 
     auto *inst = static_cast<InstancesInfo*>( d->memory->data() );
+
+    if (!inst) {
+        qCritical() << "Shared memory data is NULL!";
+        abortSafely();
+    } else {
+
+        qCritical() << "Shared memory data doesn't NULL!";
+        qCritical() << "Primary: " << inst->primary << QString::asprintf("0x%X", inst->primary);
+        qCritical() << "Secondary: " << inst->secondary << QString::asprintf("0x%X", inst->secondary);
+        qCritical() << "Primary PID: " << inst->primaryPid << QString::asprintf("0x%llX", inst->primaryPid);
+        qCritical() << "Checksum: " << inst->checksum << QString::asprintf("0x%X", inst->checksum);
+        qCritical() << "Primary User: " << inst->primaryUser;
+    }
+
+
     QElapsedTimer time;
     time.start();