Bug: APawn::TraverseFrom

[Hyper]

There is a bug I call the TraverseForm bug that has caused crashes for a long time. It's caused by bad native Unreal code in combination wit map errors.

Here is an example crashlog:

Code: Select all

Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::TraverseFrom
Critical: APawn::findRandomDest
Critical: AActor::ProcessState
Critical: Object SkaarjBerserker UB-NexusEnd.SkaarjBerserker0, Old State State UnrealShare.ScriptedPawn.Roaming, New State State UnrealShare.ScriptedPawn.Roaming
Critical: AActor::Tick
Critical: TickAllActors
Critical: ULevel::Tick
Critical: (NetMode=1)
Critical: TickLevel
Critical: UGameEngine::Tick
Critical: UpdateWorld
Critical: MainLoop
Exit: Executing UObject::StaticShutdownAfterError
Exit: appExit
Uninitialized: Name subsystem shut down
Uninitialized: Log file closed, 08/08/06 05:44:26

Check this forum for more details, including some technical background information written by Zombie.
http://www.unrealdestination.com/clients/hyper/phpBB2/viewtopic.php?t=615

By the way, this is with an Unreal 225 server. I don't use 226 because 226 is not good for servers.

[Smirftsch]

/* TraverseFrom()
traverse the graph, marking all reached paths. Return number of new paths marked
*/

description of this function, will check deeper tomorrow...

[Zombie]

This function bug was already mentioned in the main bug thread. FindRandomDest() was fixed in UT99 (view change logs) so you can probably save yourself some time and find out what Epic did in UT over 226f.

Asgard also describes how to easily reproduce the crash for testing purposes here:
http://www.oldunreal.com/cgi-bin/yabb2/YaBB.pl?num=1125061483/137#137


-Zombie

[Smirftsch]

oh cool, , didnt notice its relation to this bug yesterday evening, was to tired i guess. Need to check if I fixed this one already, will do today

[Smirftsch]

mmh, no doesnt seem to be directly in this function, using the UT's part for this didnt fix it. Guess it isnt "THAT" easy. Is there maybe some uscript relation which is changed in UT as well ?

[Smirftsch]

got it

[Hyper]

Nice! I'm sure this bug caused quit a lot of headache in the coop scene.

[Smirftsch]

think so, but the real problem wasnt in the fixrand function, indeed it was in "UnReach" part, which provides the necessary data where the monsters can go (or can't go).