New subject: [Bug 55798] Unreal Engine 5.2: Wine minidumps take hours to load into a debugger

17 Oct 2023


      https://bugs.winehq.org/show_bug.cgi?id=55798
Bug ID: 55798
           Summary: Unreal Engine 5.2: Wine minidumps take hours to load
                    into a debugger
           Product: Wine
           Version: 8.14
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: dbghelp
          Assignee: wine-bugs@winehq.org
          Reporter: aiden.deloryn@tensorworks.com.au
      Distribution: ---
=== Overview ===
When attempting to load a Wine generated minidump from an Unreal Engine
application using a debugger (such as Visual Studio or VS Code), it takes a
number of hours for the file to load. If left uninterrupted during this time,
the process does eventually complete and all of the expected debug data becomes
visible within the IDE. This behaviour has only been observed for minidumps of
type MiniDumpNormal. When working with a Wine generated minidump of type
MiniDumpWithFullMemory, the debugger is able to load the file within a few
seconds.
=== Steps to Reproduce ===
1. Build this minimal sample application
https://github.com/TensorWorks/BuggyFirstPersonDemo.git on a Windows machine
with Unreal Engine 5.2.1 using the following command:
C:<UE_INSTALL_DIR>\Engine\Build\BatchFiles\RunUAT.bat BuildCookRun -utf8output
-clientconfig=DebugGame
-project="C:<PATH_TO_PROJECT_DIR>\BuggyFirstPersonDemo.uproject" -noP4 -cook
-build -stage -prereqs -pak -archive
-archivedirectory="C:<PATH_TO_PROJECT_DIR>\GameBuilds" -platform=Win64
2. Copy the build directory (C:<PATH_TO_PROJECT_DIR>\GameBuilds) to a Linux
machine and run the application using Wine (DXVK required):
wine
./GameBuilds/Windows/BuggyFirstPersonDemo/Binaries/Win64/BuggyFirstPersonDemo-Win64-DebugGame.exe
-windowed -ResX=800 -ResY=600
3. Trigger a crash by picking up the gun and shooting the large white cube.
Note: hold down the right mouse button to aim/look, and press the left mouse
button to shoot.
4. Copy the crash dump from
./GameBuilds/Windows/BuggyFirstPersonDemo/Saved/Crashes/<CRASH_ID>/UEMinidump.dmp
to a Windows machine and attempt to load it using Visual Studio or VS Code (for
VS Code you will need the C/C++ extension from Microsoft installed).
=== Actual Results ===
The minidump takes hours to load into Visual Studio and VS Code.
MemoryListStream contains over 950,000 memory ranges (see additional
information below).
=== Expected Results ===
The minidump takes less than a minute to load into Visual Studio and VS Code,
which is true for full memory minidumps generated under Wine and any minidump
generated under Windows.
=== Build Date & Hardware ===
wine-8.14 on Ubuntu 22.04.3 LTS x86-64
=== Additional Builds and Platforms ===
Also reproducible on wine-8.17 and wine-8.0.2
=== Additional Information ===
When analysing and comparing minidumps generated under Wine versus those
generated under Windows using the Microsoft Crash Dump File Checker tool
“DumpChk”
(https://learn.microsoft.com/en-us/windows-hardware/drivers/debugger/dumpchk),
a significant discrepancy can be observed in the normal minidump generated
under Wine. In particular, the number of memory ranges in MemoryListStream is
substantially higher, as can be seen in the excerpts below. Note that full
memory minidumps have also been included from both Windows and Wine for
additional context and comparison.
Windows - MiniDumpNormal:
Stream 3: type MemoryListStream (5), size 00000804, RVA 0006FF09
  128 memory ranges
  [OMITTED]
  Total memory: 463cc
Wine - MiniDumpNormal:
Stream 4: type MemoryListStream (5), size 00EA0FF4, RVA 0002986B
  958719 memory ranges
  [OMITTED]
  Total memory: 15bd62e
Windows - MiniDumpWithFullMemory:
Stream 5: type Memory64ListStream (9), size 0000EAC0, RVA 000C8D45
  3755 memory ranges
  [OMITTED]
  Total memory: a74c1000
Wine - MiniDumpWithFullMemory:
Stream 7: type Memory64ListStream (9), size 0000E260, RVA 0006ADFB
  3621 memory ranges
  [OMITTED]
  Total memory: 7ab14000
Note: You can generate a full memory minidump using the provided sample
application by specifying the -fullcrashdumpalways flag. For example:
wine
./GameBuilds/Windows/BuggyFirstPersonDemo/Binaries/Win64/BuggyFirstPersonDemo-Win64-DebugGame.exe
-windowed -ResX=800 -ResY=600 -fullcrashdumpalways
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[Bug 55798] New: Unreal Engine 5.2: Wine minidumps take hours to load into a debugger