Hard freeze/deadlock (0xC0000194) when SimConnect injects AI traffic - regression from SU4 beta to final

Jpilot865 · December 18, 2025, 6:40pm

ISSUE DESCRIPTION

Description of the issue:

Hard freeze (STATUS_POSSIBLE_DEADLOCK 0xC0000194) occurs when third-party SimConnect applications inject AI traffic. The simulator becomes completely unresponsive - not a CTD, but a total deadlock where even Task Manager cannot terminate the process (returns error 0xC0000194). A full system reboot is required.

This issue began after updating from SU4 beta to SU4 final release (1.6.34.0). I participated in the SU4 beta for several months with zero issues. The problem appeared immediately upon updating to the final release.

The freeze occurs specifically when AI traffic injection begins via SimConnect (using BeyondATC traffic system). The sim runs perfectly fine without traffic injection enabled.

Crash log shows:

Where=“HangDetector”
Code=0xC0000194 (STATUS_POSSIBLE_DEADLOCK)
All WASM modules show “Ready” status
Occurs at busy airports (KLAX, KSFO) when traffic spawning begins

FREQUENCY OF ISSUE

Every time traffic injection is enabled. 100% reproducible.

REPRODUCTION STEPS

Load flight at busy airport (KLAX or KSFO)
Use third-party SimConnect traffic injection (BeyondATC with AIG models)
Wait for traffic to begin spawning (~1-2 minutes after flight loads)
Simulator freezes completely - audio loops, no input response
Task Manager cannot kill FlightSimulator.exe (returns 0xC0000194)
Full system reboot required

[PC ONLY] FAULT BUCKET ID

From crash log:

Code=0xC0000194
Where=“HangDetector”
BuildVersion=“1.6.34.0”

YOUR SETTINGS

Tested with reduced Community folder - issue persists. Not a third-party addon conflict as the same setup worked perfectly throughout SU4 beta.

What peripherals are you using: WinWing flight controls, standard peripherals

[PC Only] Are you using Developer Mode: Yes

[PC Only] What GPU: AMD Radeon RX 7900 XTX (Driver 24.11.1 - rolled back from 24.12.1, issue persists on both)

[PC Only] Other relevant specs:

CPU: AMD Ryzen 9 9950X3D
RAM: 64GB DDR5
Resolution: 3440x1440
Platform: Steam

ADDITIONAL CONTEXT

Worked perfectly in SU4 beta for 2+ months
Issue started with SU4 final release (never tested 1.6.32.0, went directly to 1.6.34.0)
Multiple SimConnect clients running (typical complex addon setup)
SU4 release notes mention SimConnect fixes - these changes may have introduced a regression
The freeze is a deadlock, not a crash - Windows cannot terminate the process

MEDIA

AsoboReport-RunningSession.txt (35.8 KB)

mikejenlyons · December 30, 2025, 8:33pm

Same error here i think - but not a hard lockup…SIM CTD ‘gracefully’ after what seems to be memory clearing (about 10-15 seconds of being frozen). AsoboReport-RunningSession lists “HangDetector” and crash code 0xC0000194. AsoboReport-Crash lists “_handleSEH”, type “SEH”, code "0xC0000005” (might have missed a zero). Crashes every time I’m flying with BeyondATC with traffic injection from FSLTL but at random times on each flight some enroute…some while taxing. Completely clean install from two days ago on all applications following a computer factory reset. Will turn off traffic injection tomorrow and see if it happens again.

LushThrower3365 · January 1, 2026, 3:41am

Same item here. Hopefully, there will be a fit soon!!!

/!/ CRASH /!/TOML
[LastKnownDump]
Where=“HangDetector”
Code=0xC0000194
[Platform]
CmdLine=
[Engine]
ReportVersion=10
ExitApp=false
PlayerSessionID=“BACBD4D5-9FBB-4E9B-8073-5079931FC420”
TimeUTC=2026-01-01T03:25:41Z
BuildVersion=“1.6.34.0”
UnscaledDeltaTimeMs=19.452899
TimeSpentRunningMs=874820.683944
TimeSpentPauseOffMs=874820.683944
TimeSpentTurnedOnMs=874820.683944
ContextUID=-8154917036325353096 #0x8ED3EA297D0BC978
MemInfoUID=-3896015000572080673 #0xC9EE92FFBB4ECDDF
DebuggerAllowed=false
AllocatedMem=23349403648
BucketMemUsed=2720
BucketMemCommit=131072
BucketMemBudget=6442450944
FrameCount=57810
IsMSIXVC=true
Purpose=“[default purpose]”
[AsynchCheckHandles]
Status=“Idle”
EndedXFramesAgo=1629
Duration=14
Restarts=0
FreedHandles=21088
SafeShutFailedCount=0
CreatedHandlesDuringACH=0
CreatedHandlesSinceEnded=546
[Hardware]
Platform=“PC”
Cpu=“GenuineIntel”
Brand=“13th Gen Intel(R) Core™ i9-13900KS”
DriverVersion=“59159”
GPUName=“NVIDIA GeForce RTX 4090”
HWS_Enabled=0
[Fibers]
Cancelled=false
NumCreated_TOTAL=415
NumExternalCreated=0
NumConverted=56
NumExternalConverted=0
NumCreatedFiberMgr=415
[Renderer]
EnableD3D12=true
Model=“Nvidia”
VR_State=“Inactive”
VideoMemoryBudget=22900899840
TexturesToDeleteCount=20
TexturesToDeleteTotalSize=3407872
ActiveRenderSystem=0
[Renderer_Textures]

/!/ CRASH /!/TOML
[OnCrash]
Msg=“_handleSEH”
Type=“SEH”
Code=0xC0000005
[Platform]
CmdLine=
[Engine]
ReportVersion=10
ExitApp=false
PlayerSessionID=“BACBD4D5-9FBB-4E9B-8073-5079931FC420”
TimeUTC=2026-01-01T03:25:33Z
BuildVersion=“1.6.34.0”
UnscaledDeltaTimeMs=23.100999
TimeSpentRunningMs=872560.66863
TimeSpentPauseOffMs=872560.66863
TimeSpentTurnedOnMs=872560.66863
ContextUID=0x2CEE1BF3DFBF8A2B
MemInfoUID=-855239234169944151 #0xF4219472A152C7A9
DebuggerAllowed=false
AllocatedMem=23365144576
BucketMemUsed=2720
BucketMemCommit=131072
BucketMemBudget=6442450944
FrameCount=57754
IsMSIXVC=true
Purpose=“NoTypeInfo”
[AsynchCheckHandles]
Status=“Idle”
EndedXFramesAgo=1573
Duration=14
Restarts=0
FreedHandles=21088
SafeShutFailedCount=0
CreatedHandlesDuringACH=0
CreatedHandlesSinceEnded=510
[Hardware]
Platform=“PC”
Cpu=“GenuineIntel”
Brand=“13th Gen Intel(R) Core™ i9-13900KS”
DriverVersion=“59159”
GPUName=“NVIDIA GeForce RTX 4090”
HWS_Enabled=0
[Fibers]
Cancelled=false
NumCreated_TOTAL=471
NumExternalCreated=0
NumConverted=56
NumExternalConverted=0
NumCreatedFiberMgr=471
[Renderer]
EnableD3D12=true
Model=“Nvidia”
VR_State=“Inactive”
VideoMemoryBudget=22900899840
TexturesToDeleteCount=150
TexturesToDeleteTotalSize=18481152
ActiveRenderSystem=0
[Renderer_Textures]

Evergreen175 · January 14, 2026, 11:23pm

Happened to me today too. CTD enroute with error message. Didn’t see it occur, just heard sound disappear from other room during a long haul.

Where=“HangDetector”
Code=0xC0000194

I was on VATSIM, using Vpilot that was recently updated. No AI traffic injection, however. All drivers up to date.

Hope there is a fix soon.

RTX 5090

AMD 9950X3d

Pilot777X · January 18, 2026, 6:29am

Same here although sim freezes twice for less then a second before crash, getting it nearly every flight using beyondatc and fsltl:

/!/ CRASH /!/TOML
[LastKnownDump]
Where=“HangDetector”
Code=0xC0000194
[Platform]
CmdLine=[“-FastLaunch”]
[Engine]
ReportVersion=10
ExitApp=false
PlayerSessionID=“7D06DFB6-AE3C-46E1-898E-FB37AD6DC39A”
TimeUTC=2026-01-17T16:39:36Z
BuildVersion=“1.6.34.0”
UnscaledDeltaTimeMs=26.5034
TimeSpentRunningMs=7447625.563073
TimeSpentPauseOffMs=7447625.563073
TimeSpentTurnedOnMs=7447625.563073
ContextUID=-6858904519392131234 #0xA0D046ADFD4F875E
MemInfoUID=-3840169206694497520 #0xCAB4FA73DD94B310
DebuggerAllowed=false
AllocatedMem=27861749760
BucketMemUsed=2720
BucketMemCommit=131072
BucketMemBudget=6442450944
FrameCount=394447
IsMSIXVC=true
Purpose=“[default purpose]”
[AsynchCheckHandles]
Status=“Idle”
EndedXFramesAgo=2338
Duration=15
Restarts=0
FreedHandles=47519
SafeShutFailedCount=0
CreatedHandlesDuringACH=16
CreatedHandlesSinceEnded=53402
[Hardware]
Platform=“PC”
Cpu=“GenuineIntel”
Brand=“13th Gen Intel(R) Core™ i9-13900K”
DriverVersion=“59174”
GPUName=“NVIDIA GeForce RTX 3090”
HWS_Enabled=1

zuNECNBEARDK · January 27, 2026, 10:16am

Also been getting some weird crashes when using BeyondATC. But also has happened without using it. I’ve cleared WASM folder but has re-ocurred.

/!/ CRASH /!/TOML
[LastKnownDump]
Where=“HangDetector”
Code=0xC0000194
[Platform]
CmdLine=
[Engine]
ReportVersion=10
ExitApp=false
PlayerSessionID=“F76E02B9-0B17-4128-BA48-4D9CF659F3AF”
TimeUTC=2026-01-27T10:15:55Z
BuildVersion=“1.6.34.0”
UnscaledDeltaTimeMs=27.2194
TimeSpentRunningMs=3407222.206161
TimeSpentPauseOffMs=3407222.206161
TimeSpentTurnedOnMs=3407222.206161
ContextUID=0x6AED7177290C7720
MemInfoUID=0x2D800391D4213694
DebuggerAllowed=false
AllocatedMem=24600002560
BucketMemUsed=2720
BucketMemCommit=131072
BucketMemBudget=6442450944
FrameCount=112460
IsMSIXVC=true
Purpose=“[default purpose]”
[AsynchCheckHandles]
Status=“Idle”
EndedXFramesAgo=1573
Duration=9
Restarts=0
FreedHandles=1241
SafeShutFailedCount=0
CreatedHandlesDuringACH=0
CreatedHandlesSinceEnded=614
[Hardware]
Platform=“PC”
Cpu=“AuthenticAMD”
Brand="AMD Ryzen 9 7900X 12-Core Processor "
DriverVersion=“59174”
GPUName=“NVIDIA GeForce RTX 4080”
HWS_Enabled=1

Siumot2011 · April 26, 2026, 11:06am

Its happening to me also, I was testing it on 1.6.34.0 and SU5 beta release, crashes every flight. I’m waiting for Microsoft to fix it

Siumot2011 · April 26, 2026, 2:06pm

did you get solution for it?