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Bug 72 - Engine crash when negating deadlock
Summary: Engine crash when negating deadlock
Alias: None
Product: UPPAAL
Classification: Unclassified
Component: Engine (show other bugs)
Version: 3.4.2
Hardware: All All
: P1 major
Assignee: Gerd Behrmann
Depends on:
Reported: 2003-12-08 10:48 CET by Ulrik Nyman
Modified: 2005-02-18 11:02 CET (History)
0 users

See Also:


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Description Ulrik Nyman 2003-12-08 10:48:58 CET
When checking for deadlock the two following propeties works fine:
  A[] not deadlock
  E<> deadlock
The following two propeties crashes the engine.
  A[] deadlock
  E<> not deadlock
They both first report an error stating:
  CAUGHT EXCEPTION: Negation of the deadlock expression has not been implemented.
The real problem is that a "Fatal error: Broken pipe" is reported when trying to
check the next propety or when subsequently trying to use the simulator.
Comment 1 Gerd Behrmann 2003-12-08 19:59:01 CET
As documented in the build-in help system, these alternative uses of the deadlock state property 
are not supported in version 3.4.2, and thus the server throws an exception indicating that it is not 

In order to fix this, I have implemented handling of negated deadlock properties. These should 
now work in both the liveness checker and the reachability checker.