Majestic Q400 + FFTF Dynamic crashes P3Dv5.1 HF1

[Bob Scott 7,718]

Fired up the Majestic Q400 (1.021 Pro x64) for the first time in P3D v5.1 HF1, and first three flights in a row I got a CTD right at liftoff.  Troubleshooting points strongly to FSPS' FFTF Dynamic (v5.1.12.26829) as the culprit--disabling it eliminates the CTDs, replacing it results in the same problem appearing again.

I have FFTF set to AGL height mode, so seeing a crash at liftoff is what made me suspicious of FFTF Dynamic, given that it sets FFTF as a function of altitude above ground level--it would start making changes at that phase of flight.

I'm not seeing the issue with other acft, but it's repeatable with the Q400.

 

[brosss 27]

I can confirm the CTD by my side also. Windows event viewer says it is ntdll.dll error. I wrote to the developer of FFTF Dynamic and he said that his program has nothing to do with this library file.

[GSalden 4,656]

No issues with FFTF Dynamic with the Prosim 737-800 here.

The causes of ntdll.dll error messages can vary greatly. However, most of them result from a corrupt or damaged version of the ntdll DLL file itself, corrupt hardware drivers, or issues between Windows and other programs.

Could it be that both are trying to use the same memory spaces ? ( I don’t know ).

 

Edited January 13, 2021 by GSalden

[brosss 27]

It only happens with Majestic Q400.

[Bob Scott 7,718]

36 minutes ago, brosss said:

It only happens with Majestic Q400.

That's what I'm seeing as well, so far.  All the crashes are C0000374 errors in the ntdll.dll module.  Saying that his program has nothing to do with the dll is a disappointing cop-out...the dll is the faulting module, but a program can certainly drive a fault there, as it is pretty clearly doing here.

PMDG birds, FSL Scarebus, Milviz Kingair, RealAir Turbine Duke all seem OK, but the Q400 crashes every time if FFTF Dynamic is running.

I'll probably just chalk it up to the dangers inherent in using a program like FFTF Dynamic that messes with P3D's internals outside the supplied interfaces.  Honestly, on a 10-core CPU, I doubt FFTF Dynamic is doing much for me any more, anyway.  I will probably run a few tests later to see if there is any measurable increase in performance or CPU headroom resulting from running FFTF Dynamic on my 10900K--as it was originally implemented, the FFTF tweak targeted old dual-core CPUs, and Phil Spencer told us that quad+ core processors were not going to gain much from the benefits of changing the FFTF values, since most of the terrain/texture processing was moved to threads running off the primary core anyway.

[mikeymike 360]

On 1/13/2021 at 3:23 PM, w6kd said:

That's what I'm seeing as well, so far.  All the crashes are C0000374 errors in the ntdll.dll module.  Saying that his program has nothing to do with the dll is a disappointing cop-out...the dll is the faulting module, but a program can certainly drive a fault there, as it is pretty clearly doing here.

PMDG birds, FSL Scarebus, Milviz Kingair, RealAir Turbine Duke all seem OK, but the Q400 crashes every time if FFTF Dynamic is running.

I'll probably just chalk it up to the dangers inherent in using a program like FFTF Dynamic that messes with P3D's internals outside the supplied interfaces.  Honestly, on a 10-core CPU, I doubt FFTF Dynamic is doing much for me any more, anyway.  I will probably run a few tests later to see if there is any measurable increase in performance or CPU headroom resulting from running FFTF Dynamic on my 10900K--as it was originally implemented, the FFTF tweak targeted old dual-core CPUs, and Phil Spencer told us that quad+ core processors were not going to gain much from the benefits of changing the FFTF values, since most of the terrain/texture processing was moved to threads running off the primary core anyway.

 I was having the same issues with ctd ntdll crashes. I reset windows 10 via disk without removing apps and programs.

seems to have fixed it.

for me anyways.

mike

[Twenty6 692]

23 hours ago, mikeymike said:

PMDG birds, FSL Scarebus, Milviz Kingair, RealAir Turbine Duke all seem OK, but the Q400 crashes every time if FFTF Dynamic is running.

I'm not following the logic here. Seems to me the Q400 is your enemy, not FFTF Dynamic. At least that's the way you're explaining it.

I've run FFTF with many different planes in P3Dv4.5 and never experienced a problem I could trace back to FFTF. However, I don't own the Q400.

[joby33y 152]

1 hour ago, Twenty6 said:

I'm not following the logic here. Seems to me the Q400 is your enemy, not FFTF Dynamic. At least that's the way you're explaining it.

I've run FFTF with many different planes in P3Dv4.5 and never experienced a problem I could trace back to FFTF. However, I don't own the Q400.

The logic is really easy to understand.  If Q400 runs fine without FSPS, but crashes with it, then those of us who are having this same problem are following the logic to try and nail down the culprit.  

Since you dont own the Q400, and you’re quoting P3D 4.5 (which has nothing to do with this thread), what I dont understand is your logic. 

[DrumsArt 270]

Hi,

Just tested...I have the same issue with the Pro Q400/FFTF/P3Dv5.1Hf.

Faulting application name: Prepar3D.exe, version: 5.1.12.26829, time stamp: 0x5fb44f72
Faulting module name: ntdll.dll, version: 10.0.19041.662, time stamp: 0x27bfa5f0
Exception code: 0xc0000374
Fault offset: 0x00000000000ff0f9
Faulting process id: 0x27c4
Faulting application start time: 0x01d6ec18a93f1909
Faulting application path: D:\Lockheed Martin\Prepar3D v5\Prepar3D.exe
Faulting module path: C:\WINDOWS\SYSTEM32\ntdll.dll
Report Id: 7ee7dbd0-cd06-4904-8ac7-b439c9940afa
Faulting package full name:
Faulting package-relative application ID:

I'll redo a test without FFTF later (no time right now).

Richard.

Edited January 16, 2021 by DrumsArt

[Twenty6 692]

2 hours ago, joby33y said:

Since you dont own the Q400, and you’re quoting P3D 4.5 (which has nothing to do with this thread), what I dont understand is your logic. 

OK, sorry! Thought this was a sensible discussion. My mistake.

[DrumsArt 270]

I made some tests:
1-I tried with the Frame Scenario of FFTF=same issue.

2-No FFTF=no problem.

3-Run FFTF after takeoff, everything seems ok. Then I went down to 100ft, still no problem.
On the other hand when I came out of P3Dv5.1 I got the following error message:

Faulting application name: Prepar3D.exe, version: 5.1.12.26829, time stamp: 0x5fb44f72
Faulting module name: ucrtbase.dll, version: 10.0.19041.546, time stamp: 0x43cbc11d
Exception code: 0xc0000409
Fault offset: 0x000000000007287e
Faulting process id: 0x24d4
Faulting application start time: 0x01d6ec5b9faa91d2
Faulting application path: D:\Lockheed Martin\Prepar3D v5\Prepar3D.exe
Faulting module path: C:\WINDOWS\System32\ucrtbase.dll
Report Id: 8d95325d-13f6-4504-8ceb-7dbe5b1e5a5f
Faulting package full name:
Faulting package-relative application ID:

I don't know if it helps, anyway I'll fly with the Q400 without FFTF for the moment.

Richard.

Edited January 16, 2021 by DrumsArt