/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/fork_loop_unsafe.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-24 13:19:50,773 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-24 13:19:50,775 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-24 13:19:50,810 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-03-24 13:19:50,810 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-03-24 13:19:50,813 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-03-24 13:19:50,815 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-03-24 13:19:50,820 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-03-24 13:19:50,822 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-03-24 13:19:50,826 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-03-24 13:19:50,827 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-03-24 13:19:50,828 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-03-24 13:19:50,828 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-03-24 13:19:50,830 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-03-24 13:19:50,831 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-03-24 13:19:50,832 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-03-24 13:19:50,835 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-03-24 13:19:50,836 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-03-24 13:19:50,838 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-03-24 13:19:50,845 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-03-24 13:19:50,847 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-03-24 13:19:50,848 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-03-24 13:19:50,849 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-03-24 13:19:50,850 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-03-24 13:19:50,856 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-03-24 13:19:50,862 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-03-24 13:19:50,863 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-03-24 13:19:50,863 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-03-24 13:19:50,864 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf [2021-03-24 13:19:50,884 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-24 13:19:50,884 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-24 13:19:50,885 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-24 13:19:50,885 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-24 13:19:50,885 INFO L138 SettingsManager]: * Use SBE=true [2021-03-24 13:19:50,885 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-24 13:19:50,885 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-24 13:19:50,885 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-24 13:19:50,886 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-24 13:19:50,886 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-24 13:19:50,886 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-24 13:19:50,886 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-24 13:19:50,886 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-24 13:19:50,886 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-24 13:19:50,886 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-24 13:19:50,886 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-24 13:19:50,887 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-24 13:19:50,887 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-24 13:19:50,887 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-24 13:19:50,887 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-24 13:19:50,887 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-24 13:19:50,887 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 13:19:50,887 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-24 13:19:50,888 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-24 13:19:50,888 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-24 13:19:50,888 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-24 13:19:50,888 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-24 13:19:50,888 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=VARIABLE_BASED_MOVER_CHECK [2021-03-24 13:19:50,888 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-24 13:19:50,888 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-24 13:19:51,140 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-24 13:19:51,159 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-24 13:19:51,161 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-24 13:19:51,162 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-24 13:19:51,163 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-24 13:19:51,163 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_unsafe.bpl [2021-03-24 13:19:51,164 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_unsafe.bpl' [2021-03-24 13:19:51,185 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-24 13:19:51,186 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-24 13:19:51,189 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-24 13:19:51,189 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-24 13:19:51,189 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-24 13:19:51,200 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:19:51" (1/1) ... [2021-03-24 13:19:51,206 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:19:51" (1/1) ... [2021-03-24 13:19:51,212 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-24 13:19:51,214 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-24 13:19:51,214 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-24 13:19:51,214 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-24 13:19:51,221 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:19:51" (1/1) ... [2021-03-24 13:19:51,221 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:19:51" (1/1) ... [2021-03-24 13:19:51,222 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:19:51" (1/1) ... [2021-03-24 13:19:51,222 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:19:51" (1/1) ... [2021-03-24 13:19:51,224 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:19:51" (1/1) ... [2021-03-24 13:19:51,226 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:19:51" (1/1) ... [2021-03-24 13:19:51,226 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:19:51" (1/1) ... [2021-03-24 13:19:51,227 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-24 13:19:51,228 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-24 13:19:51,228 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-24 13:19:51,228 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-24 13:19:51,229 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:19:51" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 13:19:51,285 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-24 13:19:51,285 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-24 13:19:51,286 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-24 13:19:51,286 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2021-03-24 13:19:51,286 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2021-03-24 13:19:51,286 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2021-03-24 13:19:51,287 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-24 13:19:51,395 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-24 13:19:51,395 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-03-24 13:19:51,396 INFO L202 PluginConnector]: Adding new model fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 01:19:51 BoogieIcfgContainer [2021-03-24 13:19:51,396 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-24 13:19:51,397 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-24 13:19:51,397 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-24 13:19:51,399 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-24 13:19:51,399 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:19:51" (1/2) ... [2021-03-24 13:19:51,400 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40f6062b and model type fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.03 01:19:51, skipping insertion in model container [2021-03-24 13:19:51,400 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 01:19:51" (2/2) ... [2021-03-24 13:19:51,401 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_loop_unsafe.bpl [2021-03-24 13:19:51,406 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-24 13:19:51,409 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-24 13:19:51,409 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-24 13:19:51,424 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:51,424 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:51,425 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:51,425 WARN L313 ript$VariableManager]: TermVariabe threadThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:51,430 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:19:51,445 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-03-24 13:19:51,462 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:19:51,463 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:19:51,463 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:19:51,463 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:19:51,463 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:19:51,463 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:19:51,463 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:19:51,463 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:19:51,470 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 13 places, 10 transitions, 25 flow [2021-03-24 13:19:51,483 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-24 13:19:51,484 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:19:51,485 INFO L84 FinitePrefix]: Finished finitePrefix Result has 16 conditions, 11 events. 0/11 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 11 event pairs, 0 based on Foata normal form. 0/10 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 13:19:51,485 INFO L82 GeneralOperation]: Start removeDead. Operand has 13 places, 10 transitions, 25 flow [2021-03-24 13:19:51,488 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 13 places, 10 transitions, 25 flow [2021-03-24 13:19:51,489 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:19:51,497 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 13 places, 10 transitions, 25 flow [2021-03-24 13:19:51,500 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 13 places, 10 transitions, 25 flow [2021-03-24 13:19:51,500 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 13 places, 10 transitions, 25 flow [2021-03-24 13:19:51,504 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-24 13:19:51,504 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:19:51,504 INFO L84 FinitePrefix]: Finished finitePrefix Result has 16 conditions, 11 events. 0/11 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 14 event pairs, 0 based on Foata normal form. 0/10 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 13:19:51,505 INFO L142 LiptonReduction]: Number of co-enabled transitions 24 [2021-03-24 13:19:51,641 INFO L154 LiptonReduction]: Checked pairs total: 9 [2021-03-24 13:19:51,641 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-24 13:19:51,643 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 155 [2021-03-24 13:19:51,648 INFO L129 PetriNetUnfolder]: 0/5 cut-off events. [2021-03-24 13:19:51,648 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:19:51,648 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:51,649 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2021-03-24 13:19:51,649 INFO L428 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-03-24 13:19:51,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:51,669 INFO L82 PathProgramCache]: Analyzing trace with hash 59486, now seen corresponding path program 1 times [2021-03-24 13:19:51,675 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:51,676 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538986435] [2021-03-24 13:19:51,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:51,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:51,788 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:51,789 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:51,800 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:51,803 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:51,813 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:51,815 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538986435] [2021-03-24 13:19:51,815 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:19:51,815 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-24 13:19:51,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145506378] [2021-03-24 13:19:51,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 13:19:51,822 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:51,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 13:19:51,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-03-24 13:19:51,837 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 3 out of 14 [2021-03-24 13:19:51,838 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 10 places, 7 transitions, 19 flow. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:51,838 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:51,838 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 3 of 14 [2021-03-24 13:19:51,839 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:51,891 INFO L129 PetriNetUnfolder]: 1/9 cut-off events. [2021-03-24 13:19:51,891 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:19:51,893 INFO L84 FinitePrefix]: Finished finitePrefix Result has 21 conditions, 9 events. 1/9 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 10 event pairs, 0 based on Foata normal form. 0/9 useless extension candidates. Maximal degree in co-relation 9. Up to 4 conditions per place. [2021-03-24 13:19:51,894 INFO L132 encePairwiseOnDemand]: 10/14 looper letters, 2 selfloop transitions, 3 changer transitions 1/7 dead transitions. [2021-03-24 13:19:51,895 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 12 places, 7 transitions, 29 flow [2021-03-24 13:19:51,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 13:19:51,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 13:19:51,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 18 transitions. [2021-03-24 13:19:51,905 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.32142857142857145 [2021-03-24 13:19:51,905 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 18 transitions. [2021-03-24 13:19:51,906 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 18 transitions. [2021-03-24 13:19:51,907 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:51,908 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 18 transitions. [2021-03-24 13:19:51,909 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:51,920 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:51,921 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:51,922 INFO L185 Difference]: Start difference. First operand has 10 places, 7 transitions, 19 flow. Second operand 4 states and 18 transitions. [2021-03-24 13:19:51,923 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 12 places, 7 transitions, 29 flow [2021-03-24 13:19:51,925 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 12 places, 7 transitions, 29 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-03-24 13:19:51,927 INFO L241 Difference]: Finished difference. Result has 12 places, 5 transitions, 21 flow [2021-03-24 13:19:51,928 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=14, PETRI_DIFFERENCE_MINUEND_FLOW=17, PETRI_DIFFERENCE_MINUEND_PLACES=9, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=6, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=3, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=21, PETRI_PLACES=12, PETRI_TRANSITIONS=5} [2021-03-24 13:19:51,929 INFO L343 CegarLoopForPetriNet]: 10 programPoint places, 2 predicate places. [2021-03-24 13:19:51,929 INFO L480 AbstractCegarLoop]: Abstraction has has 12 places, 5 transitions, 21 flow [2021-03-24 13:19:51,929 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:51,929 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:51,930 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 13:19:51,930 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-24 13:19:51,930 INFO L428 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-03-24 13:19:51,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:51,930 INFO L82 PathProgramCache]: Analyzing trace with hash 1843844, now seen corresponding path program 1 times [2021-03-24 13:19:51,931 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:51,931 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327065119] [2021-03-24 13:19:51,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:51,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:19:51,946 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:19:51,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:19:51,955 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:19:51,968 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:19:51,968 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:19:51,969 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-24 13:19:51,969 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:19:51,970 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-03-24 13:19:51,976 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:51,976 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:51,977 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:51,977 WARN L313 ript$VariableManager]: TermVariabe threadThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:51,978 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:51,979 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:51,979 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:51,979 WARN L313 ript$VariableManager]: TermVariabe threadThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:51,986 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:19:51,987 INFO L253 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-03-24 13:19:51,989 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:19:51,989 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:19:51,990 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:19:51,990 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:19:51,990 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:19:51,990 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:19:51,990 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:19:51,990 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:19:51,991 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 20 places, 15 transitions, 42 flow [2021-03-24 13:19:51,998 INFO L129 PetriNetUnfolder]: 0/18 cut-off events. [2021-03-24 13:19:51,998 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-24 13:19:51,998 INFO L84 FinitePrefix]: Finished finitePrefix Result has 28 conditions, 18 events. 0/18 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 29 event pairs, 0 based on Foata normal form. 0/16 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-24 13:19:51,999 INFO L82 GeneralOperation]: Start removeDead. Operand has 20 places, 15 transitions, 42 flow [2021-03-24 13:19:52,000 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 20 places, 15 transitions, 42 flow [2021-03-24 13:19:52,000 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:19:52,000 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 20 places, 15 transitions, 42 flow [2021-03-24 13:19:52,001 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 20 places, 15 transitions, 42 flow [2021-03-24 13:19:52,002 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 20 places, 15 transitions, 42 flow [2021-03-24 13:19:52,014 INFO L129 PetriNetUnfolder]: 0/18 cut-off events. [2021-03-24 13:19:52,015 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-24 13:19:52,015 INFO L84 FinitePrefix]: Finished finitePrefix Result has 28 conditions, 18 events. 0/18 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 25 event pairs, 0 based on Foata normal form. 0/16 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-24 13:19:52,016 INFO L142 LiptonReduction]: Number of co-enabled transitions 88 [2021-03-24 13:19:52,060 INFO L154 LiptonReduction]: Checked pairs total: 112 [2021-03-24 13:19:52,061 INFO L156 LiptonReduction]: Total number of compositions: 3 [2021-03-24 13:19:52,061 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 61 [2021-03-24 13:19:52,063 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-24 13:19:52,063 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-24 13:19:52,063 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:52,063 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 13:19:52,063 INFO L428 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:52,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:52,064 INFO L82 PathProgramCache]: Analyzing trace with hash 2581598, now seen corresponding path program 1 times [2021-03-24 13:19:52,064 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:52,064 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763825911] [2021-03-24 13:19:52,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:52,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:52,074 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,075 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:52,078 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,078 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:52,082 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,083 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:52,087 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:52,088 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763825911] [2021-03-24 13:19:52,088 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:19:52,088 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 13:19:52,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842457758] [2021-03-24 13:19:52,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-24 13:19:52,088 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:52,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-24 13:19:52,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-03-24 13:19:52,089 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 18 [2021-03-24 13:19:52,090 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 17 places, 12 transitions, 36 flow. Second operand has 5 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,090 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:52,090 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 18 [2021-03-24 13:19:52,090 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:52,149 INFO L129 PetriNetUnfolder]: 34/75 cut-off events. [2021-03-24 13:19:52,149 INFO L130 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2021-03-24 13:19:52,149 INFO L84 FinitePrefix]: Finished finitePrefix Result has 163 conditions, 75 events. 34/75 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 197 event pairs, 4 based on Foata normal form. 0/61 useless extension candidates. Maximal degree in co-relation 119. Up to 44 conditions per place. [2021-03-24 13:19:52,150 INFO L132 encePairwiseOnDemand]: 13/18 looper letters, 12 selfloop transitions, 6 changer transitions 0/20 dead transitions. [2021-03-24 13:19:52,151 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 21 places, 20 transitions, 93 flow [2021-03-24 13:19:52,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-24 13:19:52,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-24 13:19:52,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 39 transitions. [2021-03-24 13:19:52,152 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.43333333333333335 [2021-03-24 13:19:52,152 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 39 transitions. [2021-03-24 13:19:52,152 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 39 transitions. [2021-03-24 13:19:52,153 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:52,153 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 39 transitions. [2021-03-24 13:19:52,153 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,154 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,154 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,154 INFO L185 Difference]: Start difference. First operand has 17 places, 12 transitions, 36 flow. Second operand 5 states and 39 transitions. [2021-03-24 13:19:52,154 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 21 places, 20 transitions, 93 flow [2021-03-24 13:19:52,155 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 20 transitions, 91 flow, removed 1 selfloop flow, removed 0 redundant places. [2021-03-24 13:19:52,156 INFO L241 Difference]: Finished difference. Result has 22 places, 14 transitions, 56 flow [2021-03-24 13:19:52,156 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=18, PETRI_DIFFERENCE_MINUEND_FLOW=34, PETRI_DIFFERENCE_MINUEND_PLACES=17, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=12, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=8, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=56, PETRI_PLACES=22, PETRI_TRANSITIONS=14} [2021-03-24 13:19:52,156 INFO L343 CegarLoopForPetriNet]: 17 programPoint places, 5 predicate places. [2021-03-24 13:19:52,157 INFO L480 AbstractCegarLoop]: Abstraction has has 22 places, 14 transitions, 56 flow [2021-03-24 13:19:52,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,157 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:52,157 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2021-03-24 13:19:52,157 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-24 13:19:52,157 INFO L428 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:52,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:52,158 INFO L82 PathProgramCache]: Analyzing trace with hash -1814101293, now seen corresponding path program 1 times [2021-03-24 13:19:52,158 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:52,158 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884426305] [2021-03-24 13:19:52,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:52,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:19:52,164 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:19:52,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:19:52,167 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:19:52,169 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:19:52,169 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:19:52,169 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-24 13:19:52,169 WARN L342 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:19:52,170 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-03-24 13:19:52,174 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:52,174 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:52,174 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:52,174 WARN L313 ript$VariableManager]: TermVariabe threadThread3of3ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:52,175 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:52,175 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:52,175 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:52,175 WARN L313 ript$VariableManager]: TermVariabe threadThread2of3ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:52,176 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:52,176 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:52,176 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:52,176 WARN L313 ript$VariableManager]: TermVariabe threadThread1of3ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:52,179 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:19:52,180 INFO L253 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2021-03-24 13:19:52,181 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:19:52,181 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:19:52,181 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:19:52,181 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:19:52,181 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:19:52,181 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:19:52,181 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:19:52,181 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:19:52,182 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 27 places, 20 transitions, 61 flow [2021-03-24 13:19:52,186 INFO L129 PetriNetUnfolder]: 0/25 cut-off events. [2021-03-24 13:19:52,187 INFO L130 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2021-03-24 13:19:52,187 INFO L84 FinitePrefix]: Finished finitePrefix Result has 41 conditions, 25 events. 0/25 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 50 event pairs, 0 based on Foata normal form. 0/22 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-24 13:19:52,187 INFO L82 GeneralOperation]: Start removeDead. Operand has 27 places, 20 transitions, 61 flow [2021-03-24 13:19:52,187 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 27 places, 20 transitions, 61 flow [2021-03-24 13:19:52,188 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:19:52,188 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 27 places, 20 transitions, 61 flow [2021-03-24 13:19:52,188 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 27 places, 20 transitions, 61 flow [2021-03-24 13:19:52,188 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 27 places, 20 transitions, 61 flow [2021-03-24 13:19:52,192 INFO L129 PetriNetUnfolder]: 0/25 cut-off events. [2021-03-24 13:19:52,192 INFO L130 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2021-03-24 13:19:52,192 INFO L84 FinitePrefix]: Finished finitePrefix Result has 41 conditions, 25 events. 0/25 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 45 event pairs, 0 based on Foata normal form. 0/22 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-24 13:19:52,193 INFO L142 LiptonReduction]: Number of co-enabled transitions 192 [2021-03-24 13:19:52,228 INFO L154 LiptonReduction]: Checked pairs total: 310 [2021-03-24 13:19:52,229 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-24 13:19:52,229 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 41 [2021-03-24 13:19:52,231 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-24 13:19:52,231 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-24 13:19:52,231 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:52,231 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 13:19:52,232 INFO L428 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:52,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:52,232 INFO L82 PathProgramCache]: Analyzing trace with hash 3472476, now seen corresponding path program 1 times [2021-03-24 13:19:52,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:52,232 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963271230] [2021-03-24 13:19:52,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:52,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:52,242 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,243 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:52,246 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,246 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:52,250 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,250 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:52,255 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:52,255 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [963271230] [2021-03-24 13:19:52,255 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:19:52,256 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 13:19:52,256 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491846478] [2021-03-24 13:19:52,256 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-24 13:19:52,256 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:52,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-24 13:19:52,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-03-24 13:19:52,257 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 5 out of 24 [2021-03-24 13:19:52,257 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 23 places, 16 transitions, 53 flow. Second operand has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,257 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:52,258 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 5 of 24 [2021-03-24 13:19:52,258 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:52,441 INFO L129 PetriNetUnfolder]: 268/436 cut-off events. [2021-03-24 13:19:52,441 INFO L130 PetriNetUnfolder]: For 97/97 co-relation queries the response was YES. [2021-03-24 13:19:52,446 INFO L84 FinitePrefix]: Finished finitePrefix Result has 946 conditions, 436 events. 268/436 cut-off events. For 97/97 co-relation queries the response was YES. Maximal size of possible extension queue 38. Compared 1579 event pairs, 66 based on Foata normal form. 0/328 useless extension candidates. Maximal degree in co-relation 691. Up to 373 conditions per place. [2021-03-24 13:19:52,456 INFO L132 encePairwiseOnDemand]: 18/24 looper letters, 22 selfloop transitions, 8 changer transitions 0/32 dead transitions. [2021-03-24 13:19:52,456 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 27 places, 32 transitions, 164 flow [2021-03-24 13:19:52,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-24 13:19:52,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-24 13:19:52,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 56 transitions. [2021-03-24 13:19:52,463 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.4666666666666667 [2021-03-24 13:19:52,463 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 56 transitions. [2021-03-24 13:19:52,463 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 56 transitions. [2021-03-24 13:19:52,464 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:52,464 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 56 transitions. [2021-03-24 13:19:52,464 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,466 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 24.0) internal successors, (144), 6 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,467 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 24.0) internal successors, (144), 6 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,467 INFO L185 Difference]: Start difference. First operand has 23 places, 16 transitions, 53 flow. Second operand 5 states and 56 transitions. [2021-03-24 13:19:52,467 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 27 places, 32 transitions, 164 flow [2021-03-24 13:19:52,468 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 32 transitions, 154 flow, removed 5 selfloop flow, removed 0 redundant places. [2021-03-24 13:19:52,469 INFO L241 Difference]: Finished difference. Result has 28 places, 22 transitions, 89 flow [2021-03-24 13:19:52,469 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=24, PETRI_DIFFERENCE_MINUEND_FLOW=47, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=16, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=11, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=89, PETRI_PLACES=28, PETRI_TRANSITIONS=22} [2021-03-24 13:19:52,469 INFO L343 CegarLoopForPetriNet]: 23 programPoint places, 5 predicate places. [2021-03-24 13:19:52,469 INFO L480 AbstractCegarLoop]: Abstraction has has 28 places, 22 transitions, 89 flow [2021-03-24 13:19:52,469 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,470 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:52,470 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2021-03-24 13:19:52,470 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-24 13:19:52,470 INFO L428 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:52,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:52,471 INFO L82 PathProgramCache]: Analyzing trace with hash -958208788, now seen corresponding path program 1 times [2021-03-24 13:19:52,471 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:52,471 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913572953] [2021-03-24 13:19:52,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:52,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:52,486 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,487 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:52,490 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,491 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:52,495 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,495 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:52,500 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,500 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:52,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:52,505 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913572953] [2021-03-24 13:19:52,506 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:19:52,506 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-24 13:19:52,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821528505] [2021-03-24 13:19:52,506 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-24 13:19:52,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:52,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-24 13:19:52,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-03-24 13:19:52,507 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 5 out of 24 [2021-03-24 13:19:52,508 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 28 places, 22 transitions, 89 flow. Second operand has 6 states, 6 states have (on average 6.0) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,508 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:52,508 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 5 of 24 [2021-03-24 13:19:52,508 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:52,786 INFO L129 PetriNetUnfolder]: 475/869 cut-off events. [2021-03-24 13:19:52,787 INFO L130 PetriNetUnfolder]: For 332/332 co-relation queries the response was YES. [2021-03-24 13:19:52,790 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2160 conditions, 869 events. 475/869 cut-off events. For 332/332 co-relation queries the response was YES. Maximal size of possible extension queue 111. Compared 4624 event pairs, 246 based on Foata normal form. 0/743 useless extension candidates. Maximal degree in co-relation 668. Up to 450 conditions per place. [2021-03-24 13:19:52,799 INFO L132 encePairwiseOnDemand]: 17/24 looper letters, 41 selfloop transitions, 22 changer transitions 0/65 dead transitions. [2021-03-24 13:19:52,799 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 34 places, 65 transitions, 368 flow [2021-03-24 13:19:52,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-03-24 13:19:52,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-03-24 13:19:52,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 96 transitions. [2021-03-24 13:19:52,801 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5714285714285714 [2021-03-24 13:19:52,801 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 96 transitions. [2021-03-24 13:19:52,801 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 96 transitions. [2021-03-24 13:19:52,801 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:52,801 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 96 transitions. [2021-03-24 13:19:52,803 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 13.714285714285714) internal successors, (96), 7 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,803 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 24.0) internal successors, (192), 8 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,804 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 24.0) internal successors, (192), 8 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,804 INFO L185 Difference]: Start difference. First operand has 28 places, 22 transitions, 89 flow. Second operand 7 states and 96 transitions. [2021-03-24 13:19:52,804 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 34 places, 65 transitions, 368 flow [2021-03-24 13:19:52,805 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 65 transitions, 367 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-03-24 13:19:52,807 INFO L241 Difference]: Finished difference. Result has 36 places, 39 transitions, 255 flow [2021-03-24 13:19:52,807 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=24, PETRI_DIFFERENCE_MINUEND_FLOW=88, PETRI_DIFFERENCE_MINUEND_PLACES=27, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=22, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=11, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=10, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=255, PETRI_PLACES=36, PETRI_TRANSITIONS=39} [2021-03-24 13:19:52,807 INFO L343 CegarLoopForPetriNet]: 23 programPoint places, 13 predicate places. [2021-03-24 13:19:52,807 INFO L480 AbstractCegarLoop]: Abstraction has has 36 places, 39 transitions, 255 flow [2021-03-24 13:19:52,807 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,808 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:52,808 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:19:52,808 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-03-24 13:19:52,808 INFO L428 AbstractCegarLoop]: === Iteration 3 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:52,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:52,808 INFO L82 PathProgramCache]: Analyzing trace with hash 369066846, now seen corresponding path program 1 times [2021-03-24 13:19:52,809 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:52,809 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633804358] [2021-03-24 13:19:52,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:52,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:52,822 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,822 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:52,825 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,825 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:52,829 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,829 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:52,829 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,830 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:52,833 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:52,834 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:52,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-24 13:19:52,839 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633804358] [2021-03-24 13:19:52,839 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:19:52,839 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-24 13:19:52,839 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577111307] [2021-03-24 13:19:52,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-24 13:19:52,839 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:52,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-24 13:19:52,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-03-24 13:19:52,840 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 5 out of 24 [2021-03-24 13:19:52,840 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 36 places, 39 transitions, 255 flow. Second operand has 6 states, 6 states have (on average 6.166666666666667) internal successors, (37), 6 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:52,840 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:52,840 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 5 of 24 [2021-03-24 13:19:52,841 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:53,068 INFO L129 PetriNetUnfolder]: 689/1315 cut-off events. [2021-03-24 13:19:53,068 INFO L130 PetriNetUnfolder]: For 1497/1497 co-relation queries the response was YES. [2021-03-24 13:19:53,073 INFO L84 FinitePrefix]: Finished finitePrefix Result has 4067 conditions, 1315 events. 689/1315 cut-off events. For 1497/1497 co-relation queries the response was YES. Maximal size of possible extension queue 138. Compared 7982 event pairs, 133 based on Foata normal form. 21/1240 useless extension candidates. Maximal degree in co-relation 2673. Up to 451 conditions per place. [2021-03-24 13:19:53,082 INFO L132 encePairwiseOnDemand]: 17/24 looper letters, 42 selfloop transitions, 31 changer transitions 0/75 dead transitions. [2021-03-24 13:19:53,082 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 42 places, 75 transitions, 544 flow [2021-03-24 13:19:53,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-03-24 13:19:53,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-03-24 13:19:53,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 99 transitions. [2021-03-24 13:19:53,087 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5892857142857143 [2021-03-24 13:19:53,087 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 99 transitions. [2021-03-24 13:19:53,087 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 99 transitions. [2021-03-24 13:19:53,087 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:53,087 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 99 transitions. [2021-03-24 13:19:53,089 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 14.142857142857142) internal successors, (99), 7 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,090 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 24.0) internal successors, (192), 8 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,090 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 24.0) internal successors, (192), 8 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,090 INFO L185 Difference]: Start difference. First operand has 36 places, 39 transitions, 255 flow. Second operand 7 states and 99 transitions. [2021-03-24 13:19:53,090 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 42 places, 75 transitions, 544 flow [2021-03-24 13:19:53,098 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 42 places, 75 transitions, 542 flow, removed 1 selfloop flow, removed 0 redundant places. [2021-03-24 13:19:53,122 INFO L241 Difference]: Finished difference. Result has 45 places, 46 transitions, 406 flow [2021-03-24 13:19:53,122 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=24, PETRI_DIFFERENCE_MINUEND_FLOW=253, PETRI_DIFFERENCE_MINUEND_PLACES=36, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=39, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=26, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=11, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=406, PETRI_PLACES=45, PETRI_TRANSITIONS=46} [2021-03-24 13:19:53,123 INFO L343 CegarLoopForPetriNet]: 23 programPoint places, 22 predicate places. [2021-03-24 13:19:53,123 INFO L480 AbstractCegarLoop]: Abstraction has has 45 places, 46 transitions, 406 flow [2021-03-24 13:19:53,123 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 6.166666666666667) internal successors, (37), 6 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,123 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:53,123 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:19:53,123 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-03-24 13:19:53,123 INFO L428 AbstractCegarLoop]: === Iteration 4 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:53,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:53,124 INFO L82 PathProgramCache]: Analyzing trace with hash 360298806, now seen corresponding path program 2 times [2021-03-24 13:19:53,124 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:53,124 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705349845] [2021-03-24 13:19:53,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:53,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:53,155 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,156 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:53,159 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,160 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:53,164 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,165 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:53,169 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,169 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:53,174 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,175 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:53,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:53,180 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705349845] [2021-03-24 13:19:53,180 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:19:53,181 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-03-24 13:19:53,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126800668] [2021-03-24 13:19:53,182 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-24 13:19:53,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:53,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-24 13:19:53,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-03-24 13:19:53,183 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 5 out of 24 [2021-03-24 13:19:53,183 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 45 places, 46 transitions, 406 flow. Second operand has 7 states, 7 states have (on average 6.0) internal successors, (42), 7 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,184 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:53,184 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 5 of 24 [2021-03-24 13:19:53,184 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:53,432 INFO L129 PetriNetUnfolder]: 612/1124 cut-off events. [2021-03-24 13:19:53,432 INFO L130 PetriNetUnfolder]: For 3184/3184 co-relation queries the response was YES. [2021-03-24 13:19:53,436 INFO L84 FinitePrefix]: Finished finitePrefix Result has 4327 conditions, 1124 events. 612/1124 cut-off events. For 3184/3184 co-relation queries the response was YES. Maximal size of possible extension queue 115. Compared 6259 event pairs, 239 based on Foata normal form. 39/1072 useless extension candidates. Maximal degree in co-relation 2766. Up to 613 conditions per place. [2021-03-24 13:19:53,445 INFO L132 encePairwiseOnDemand]: 17/24 looper letters, 55 selfloop transitions, 26 changer transitions 0/83 dead transitions. [2021-03-24 13:19:53,445 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 54 places, 83 transitions, 707 flow [2021-03-24 13:19:53,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-03-24 13:19:53,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2021-03-24 13:19:53,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 128 transitions. [2021-03-24 13:19:53,447 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5333333333333333 [2021-03-24 13:19:53,447 INFO L72 ComplementDD]: Start complementDD. Operand 10 states and 128 transitions. [2021-03-24 13:19:53,448 INFO L73 IsDeterministic]: Start isDeterministic. Operand 10 states and 128 transitions. [2021-03-24 13:19:53,448 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:53,448 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 10 states and 128 transitions. [2021-03-24 13:19:53,449 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 11 states, 10 states have (on average 12.8) internal successors, (128), 10 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,450 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 11 states, 11 states have (on average 24.0) internal successors, (264), 11 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,451 INFO L81 ComplementDD]: Finished complementDD. Result has 11 states, 11 states have (on average 24.0) internal successors, (264), 11 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,451 INFO L185 Difference]: Start difference. First operand has 45 places, 46 transitions, 406 flow. Second operand 10 states and 128 transitions. [2021-03-24 13:19:53,451 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 54 places, 83 transitions, 707 flow [2021-03-24 13:19:53,458 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 53 places, 83 transitions, 695 flow, removed 4 selfloop flow, removed 1 redundant places. [2021-03-24 13:19:53,461 INFO L241 Difference]: Finished difference. Result has 56 places, 46 transitions, 471 flow [2021-03-24 13:19:53,461 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=24, PETRI_DIFFERENCE_MINUEND_FLOW=396, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=46, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=26, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=471, PETRI_PLACES=56, PETRI_TRANSITIONS=46} [2021-03-24 13:19:53,461 INFO L343 CegarLoopForPetriNet]: 23 programPoint places, 33 predicate places. [2021-03-24 13:19:53,461 INFO L480 AbstractCegarLoop]: Abstraction has has 56 places, 46 transitions, 471 flow [2021-03-24 13:19:53,461 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 6.0) internal successors, (42), 7 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,461 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:53,462 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:19:53,462 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-03-24 13:19:53,462 INFO L428 AbstractCegarLoop]: === Iteration 5 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:53,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:53,462 INFO L82 PathProgramCache]: Analyzing trace with hash 360298810, now seen corresponding path program 1 times [2021-03-24 13:19:53,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:53,462 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253234690] [2021-03-24 13:19:53,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:53,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:53,501 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,501 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:53,504 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,504 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:53,507 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,508 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:53,514 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,514 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:53,519 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:53,520 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253234690] [2021-03-24 13:19:53,520 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828552650] [2021-03-24 13:19:53,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-03-24 13:19:53,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-24 13:19:53,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 6 conjunts are in the unsatisfiable core [2021-03-24 13:19:53,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-24 13:19:53,613 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,614 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,614 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,615 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,615 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,616 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,618 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,618 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,626 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,626 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 10 [2021-03-24 13:19:53,629 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:19:53,653 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,656 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,657 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-03-24 13:19:53,661 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,675 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,677 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,677 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,684 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,685 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,685 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,687 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,688 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,688 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,689 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,689 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,690 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,690 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,692 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,692 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,695 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,695 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,696 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,698 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,699 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:19:53,705 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,705 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-24 13:19:53,707 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-03-24 13:19:53,708 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:19:53,710 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,711 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-24 13:19:53,712 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-03-24 13:19:53,715 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,716 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,716 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,717 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,724 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:19:53,726 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,727 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-24 13:19:53,729 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-03-24 13:19:53,731 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:19:53,736 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,736 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-24 13:19:53,737 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-03-24 13:19:53,739 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,741 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,742 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:53,742 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:53,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:53,751 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-24 13:19:53,751 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 8 [2021-03-24 13:19:53,751 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878785728] [2021-03-24 13:19:53,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-03-24 13:19:53,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:53,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-03-24 13:19:53,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-03-24 13:19:53,756 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 5 out of 24 [2021-03-24 13:19:53,756 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 56 places, 46 transitions, 471 flow. Second operand has 10 states, 10 states have (on average 6.4) internal successors, (64), 10 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,756 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:53,756 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 5 of 24 [2021-03-24 13:19:53,756 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:53,915 INFO L129 PetriNetUnfolder]: 546/1077 cut-off events. [2021-03-24 13:19:53,915 INFO L130 PetriNetUnfolder]: For 4386/4386 co-relation queries the response was YES. [2021-03-24 13:19:53,919 INFO L84 FinitePrefix]: Finished finitePrefix Result has 4429 conditions, 1077 events. 546/1077 cut-off events. For 4386/4386 co-relation queries the response was YES. Maximal size of possible extension queue 106. Compared 6350 event pairs, 141 based on Foata normal form. 54/1030 useless extension candidates. Maximal degree in co-relation 3093. Up to 439 conditions per place. [2021-03-24 13:19:53,927 INFO L132 encePairwiseOnDemand]: 17/24 looper letters, 35 selfloop transitions, 29 changer transitions 0/66 dead transitions. [2021-03-24 13:19:53,927 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 62 places, 66 transitions, 707 flow [2021-03-24 13:19:53,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-03-24 13:19:53,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-03-24 13:19:53,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 75 transitions. [2021-03-24 13:19:53,929 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.44642857142857145 [2021-03-24 13:19:53,929 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 75 transitions. [2021-03-24 13:19:53,929 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 75 transitions. [2021-03-24 13:19:53,929 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:53,929 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 75 transitions. [2021-03-24 13:19:53,929 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,930 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 24.0) internal successors, (192), 8 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,930 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 24.0) internal successors, (192), 8 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,931 INFO L185 Difference]: Start difference. First operand has 56 places, 46 transitions, 471 flow. Second operand 7 states and 75 transitions. [2021-03-24 13:19:53,931 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 62 places, 66 transitions, 707 flow [2021-03-24 13:19:53,937 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 55 places, 66 transitions, 624 flow, removed 14 selfloop flow, removed 7 redundant places. [2021-03-24 13:19:53,939 INFO L241 Difference]: Finished difference. Result has 57 places, 47 transitions, 488 flow [2021-03-24 13:19:53,940 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=24, PETRI_DIFFERENCE_MINUEND_FLOW=388, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=46, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=28, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=17, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=488, PETRI_PLACES=57, PETRI_TRANSITIONS=47} [2021-03-24 13:19:53,940 INFO L343 CegarLoopForPetriNet]: 23 programPoint places, 34 predicate places. [2021-03-24 13:19:53,940 INFO L480 AbstractCegarLoop]: Abstraction has has 57 places, 47 transitions, 488 flow [2021-03-24 13:19:53,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 6.4) internal successors, (64), 10 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:53,940 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:53,940 INFO L263 CegarLoopForPetriNet]: trace histogram [3, 1, 1, 1, 1, 1] [2021-03-24 13:19:54,164 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-03-24 13:19:54,165 INFO L428 AbstractCegarLoop]: === Iteration 6 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:54,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:54,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1715811062, now seen corresponding path program 1 times [2021-03-24 13:19:54,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:54,165 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981095294] [2021-03-24 13:19:54,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:54,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:19:54,169 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:19:54,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:19:54,173 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:19:54,174 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:19:54,174 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:19:54,174 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-03-24 13:19:54,174 WARN L342 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:19:54,175 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-03-24 13:19:54,179 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,179 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,179 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,179 WARN L313 ript$VariableManager]: TermVariabe threadThread3of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,179 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,179 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,180 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,180 WARN L313 ript$VariableManager]: TermVariabe threadThread1of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,180 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,180 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,180 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,180 WARN L313 ript$VariableManager]: TermVariabe threadThread2of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,180 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,181 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,181 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,181 WARN L313 ript$VariableManager]: TermVariabe threadThread4of4ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:19:54,190 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:19:54,190 INFO L253 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-03-24 13:19:54,191 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:19:54,191 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:19:54,191 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:19:54,192 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:19:54,192 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:19:54,192 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:19:54,192 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:19:54,192 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:19:54,192 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 34 places, 25 transitions, 82 flow [2021-03-24 13:19:54,194 INFO L129 PetriNetUnfolder]: 0/32 cut-off events. [2021-03-24 13:19:54,195 INFO L130 PetriNetUnfolder]: For 16/16 co-relation queries the response was YES. [2021-03-24 13:19:54,195 INFO L84 FinitePrefix]: Finished finitePrefix Result has 55 conditions, 32 events. 0/32 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 66 event pairs, 0 based on Foata normal form. 0/28 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-24 13:19:54,195 INFO L82 GeneralOperation]: Start removeDead. Operand has 34 places, 25 transitions, 82 flow [2021-03-24 13:19:54,195 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 34 places, 25 transitions, 82 flow [2021-03-24 13:19:54,195 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:19:54,195 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 34 places, 25 transitions, 82 flow [2021-03-24 13:19:54,195 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 34 places, 25 transitions, 82 flow [2021-03-24 13:19:54,196 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 34 places, 25 transitions, 82 flow [2021-03-24 13:19:54,197 INFO L129 PetriNetUnfolder]: 0/32 cut-off events. [2021-03-24 13:19:54,197 INFO L130 PetriNetUnfolder]: For 16/16 co-relation queries the response was YES. [2021-03-24 13:19:54,198 INFO L84 FinitePrefix]: Finished finitePrefix Result has 55 conditions, 32 events. 0/32 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 58 event pairs, 0 based on Foata normal form. 0/28 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-24 13:19:54,198 INFO L142 LiptonReduction]: Number of co-enabled transitions 336 [2021-03-24 13:19:54,245 INFO L154 LiptonReduction]: Checked pairs total: 576 [2021-03-24 13:19:54,245 INFO L156 LiptonReduction]: Total number of compositions: 5 [2021-03-24 13:19:54,245 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 50 [2021-03-24 13:19:54,249 INFO L129 PetriNetUnfolder]: 0/8 cut-off events. [2021-03-24 13:19:54,249 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-24 13:19:54,249 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:54,249 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 13:19:54,249 INFO L428 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:54,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:54,250 INFO L82 PathProgramCache]: Analyzing trace with hash 4458301, now seen corresponding path program 1 times [2021-03-24 13:19:54,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:54,251 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54264054] [2021-03-24 13:19:54,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:54,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:54,273 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:54,274 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:54,280 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:54,281 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:54,284 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:54,286 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:54,290 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:54,291 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54264054] [2021-03-24 13:19:54,291 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:19:54,291 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 13:19:54,291 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755663645] [2021-03-24 13:19:54,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-24 13:19:54,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:54,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-24 13:19:54,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-03-24 13:19:54,293 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 30 [2021-03-24 13:19:54,293 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 20 transitions, 72 flow. Second operand has 5 states, 5 states have (on average 6.8) internal successors, (34), 5 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:54,293 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:54,293 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 30 [2021-03-24 13:19:54,293 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:54,496 INFO L129 PetriNetUnfolder]: 1604/2283 cut-off events. [2021-03-24 13:19:54,496 INFO L130 PetriNetUnfolder]: For 726/726 co-relation queries the response was YES. [2021-03-24 13:19:54,499 INFO L84 FinitePrefix]: Finished finitePrefix Result has 4956 conditions, 2283 events. 1604/2283 cut-off events. For 726/726 co-relation queries the response was YES. Maximal size of possible extension queue 131. Compared 9353 event pairs, 600 based on Foata normal form. 0/1665 useless extension candidates. Maximal degree in co-relation 3567. Up to 2176 conditions per place. [2021-03-24 13:19:54,513 INFO L132 encePairwiseOnDemand]: 23/30 looper letters, 30 selfloop transitions, 10 changer transitions 0/42 dead transitions. [2021-03-24 13:19:54,513 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 42 transitions, 233 flow [2021-03-24 13:19:54,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-24 13:19:54,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-24 13:19:54,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 71 transitions. [2021-03-24 13:19:54,514 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.47333333333333333 [2021-03-24 13:19:54,514 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 71 transitions. [2021-03-24 13:19:54,514 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 71 transitions. [2021-03-24 13:19:54,514 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:54,515 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 71 transitions. [2021-03-24 13:19:54,515 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 14.2) internal successors, (71), 5 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:54,545 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 30.0) internal successors, (180), 6 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:54,546 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 30.0) internal successors, (180), 6 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:54,546 INFO L185 Difference]: Start difference. First operand has 29 places, 20 transitions, 72 flow. Second operand 5 states and 71 transitions. [2021-03-24 13:19:54,546 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 42 transitions, 233 flow [2021-03-24 13:19:54,547 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 42 transitions, 209 flow, removed 12 selfloop flow, removed 0 redundant places. [2021-03-24 13:19:54,548 INFO L241 Difference]: Finished difference. Result has 34 places, 28 transitions, 114 flow [2021-03-24 13:19:54,548 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=60, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=14, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=114, PETRI_PLACES=34, PETRI_TRANSITIONS=28} [2021-03-24 13:19:54,548 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 5 predicate places. [2021-03-24 13:19:54,548 INFO L480 AbstractCegarLoop]: Abstraction has has 34 places, 28 transitions, 114 flow [2021-03-24 13:19:54,548 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 6.8) internal successors, (34), 5 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:54,548 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:54,548 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2021-03-24 13:19:54,548 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-03-24 13:19:54,548 INFO L428 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:54,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:54,549 INFO L82 PathProgramCache]: Analyzing trace with hash -10703055, now seen corresponding path program 1 times [2021-03-24 13:19:54,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:54,549 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930289783] [2021-03-24 13:19:54,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:54,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:54,578 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:54,579 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:54,583 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:54,584 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:54,590 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:54,590 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:54,596 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:54,596 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:54,601 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:54,601 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930289783] [2021-03-24 13:19:54,602 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:19:54,602 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-24 13:19:54,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979675982] [2021-03-24 13:19:54,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-24 13:19:54,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:54,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-24 13:19:54,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-03-24 13:19:54,603 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 30 [2021-03-24 13:19:54,603 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 34 places, 28 transitions, 114 flow. Second operand has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:54,603 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:54,603 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 30 [2021-03-24 13:19:54,603 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:55,070 INFO L129 PetriNetUnfolder]: 3369/5234 cut-off events. [2021-03-24 13:19:55,070 INFO L130 PetriNetUnfolder]: For 2035/2035 co-relation queries the response was YES. [2021-03-24 13:19:55,080 INFO L84 FinitePrefix]: Finished finitePrefix Result has 12808 conditions, 5234 events. 3369/5234 cut-off events. For 2035/2035 co-relation queries the response was YES. Maximal size of possible extension queue 406. Compared 31038 event pairs, 1719 based on Foata normal form. 0/4306 useless extension candidates. Maximal degree in co-relation 4671. Up to 2697 conditions per place. [2021-03-24 13:19:55,112 INFO L132 encePairwiseOnDemand]: 22/30 looper letters, 60 selfloop transitions, 27 changer transitions 0/89 dead transitions. [2021-03-24 13:19:55,113 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 89 transitions, 512 flow [2021-03-24 13:19:55,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-03-24 13:19:55,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-03-24 13:19:55,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 126 transitions. [2021-03-24 13:19:55,117 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6 [2021-03-24 13:19:55,117 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 126 transitions. [2021-03-24 13:19:55,117 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 126 transitions. [2021-03-24 13:19:55,117 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:55,117 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 126 transitions. [2021-03-24 13:19:55,117 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 18.0) internal successors, (126), 7 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:55,119 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 30.0) internal successors, (240), 8 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:55,119 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 30.0) internal successors, (240), 8 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:55,119 INFO L185 Difference]: Start difference. First operand has 34 places, 28 transitions, 114 flow. Second operand 7 states and 126 transitions. [2021-03-24 13:19:55,119 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 89 transitions, 512 flow [2021-03-24 13:19:55,121 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 89 transitions, 511 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-03-24 13:19:55,124 INFO L241 Difference]: Finished difference. Result has 42 places, 49 transitions, 318 flow [2021-03-24 13:19:55,124 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=113, PETRI_DIFFERENCE_MINUEND_PLACES=33, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=14, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=318, PETRI_PLACES=42, PETRI_TRANSITIONS=49} [2021-03-24 13:19:55,124 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 13 predicate places. [2021-03-24 13:19:55,124 INFO L480 AbstractCegarLoop]: Abstraction has has 42 places, 49 transitions, 318 flow [2021-03-24 13:19:55,124 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:55,124 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:55,124 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:19:55,124 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-03-24 13:19:55,125 INFO L428 AbstractCegarLoop]: === Iteration 3 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:55,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:55,125 INFO L82 PathProgramCache]: Analyzing trace with hash -326839722, now seen corresponding path program 1 times [2021-03-24 13:19:55,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:55,126 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337305016] [2021-03-24 13:19:55,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:55,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:55,145 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,146 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:55,149 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,151 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:55,156 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,156 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:55,161 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,161 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:55,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:55,166 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337305016] [2021-03-24 13:19:55,167 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1064780620] [2021-03-24 13:19:55,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-24 13:19:55,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:55,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 6 conjunts are in the unsatisfiable core [2021-03-24 13:19:55,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-24 13:19:55,197 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,197 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,198 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,198 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,199 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,199 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,199 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,200 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,208 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,208 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 10 [2021-03-24 13:19:55,209 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:19:55,210 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,211 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,213 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-03-24 13:19:55,214 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,215 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,216 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,216 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,227 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:19:55,229 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,229 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-24 13:19:55,230 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-03-24 13:19:55,231 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:19:55,232 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,233 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-24 13:19:55,233 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-03-24 13:19:55,234 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,236 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,236 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,237 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,245 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,246 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,246 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,246 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,247 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,248 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,248 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,249 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,249 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,249 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,250 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,250 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,251 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,251 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,251 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,252 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,252 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:19:55,254 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,256 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-24 13:19:55,257 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-03-24 13:19:55,257 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:19:55,259 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,260 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-24 13:19:55,260 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-03-24 13:19:55,261 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,272 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,273 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:55,273 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:19:55,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:55,283 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-24 13:19:55,283 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 8 [2021-03-24 13:19:55,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981403073] [2021-03-24 13:19:55,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-03-24 13:19:55,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:55,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-03-24 13:19:55,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-03-24 13:19:55,284 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 30 [2021-03-24 13:19:55,284 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 42 places, 49 transitions, 318 flow. Second operand has 10 states, 10 states have (on average 7.4) internal successors, (74), 10 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:55,284 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:55,284 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 30 [2021-03-24 13:19:55,284 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:55,720 INFO L129 PetriNetUnfolder]: 3492/5405 cut-off events. [2021-03-24 13:19:55,720 INFO L130 PetriNetUnfolder]: For 6731/6731 co-relation queries the response was YES. [2021-03-24 13:19:55,734 INFO L84 FinitePrefix]: Finished finitePrefix Result has 17273 conditions, 5405 events. 3492/5405 cut-off events. For 6731/6731 co-relation queries the response was YES. Maximal size of possible extension queue 390. Compared 31299 event pairs, 548 based on Foata normal form. 90/4793 useless extension candidates. Maximal degree in co-relation 11592. Up to 3298 conditions per place. [2021-03-24 13:19:55,774 INFO L132 encePairwiseOnDemand]: 22/30 looper letters, 59 selfloop transitions, 41 changer transitions 0/102 dead transitions. [2021-03-24 13:19:55,774 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 48 places, 102 transitions, 785 flow [2021-03-24 13:19:55,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-03-24 13:19:55,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-03-24 13:19:55,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 106 transitions. [2021-03-24 13:19:55,776 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5047619047619047 [2021-03-24 13:19:55,776 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 106 transitions. [2021-03-24 13:19:55,776 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 106 transitions. [2021-03-24 13:19:55,776 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:55,776 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 106 transitions. [2021-03-24 13:19:55,776 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 15.142857142857142) internal successors, (106), 7 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:55,777 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 30.0) internal successors, (240), 8 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:55,777 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 30.0) internal successors, (240), 8 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:55,777 INFO L185 Difference]: Start difference. First operand has 42 places, 49 transitions, 318 flow. Second operand 7 states and 106 transitions. [2021-03-24 13:19:55,778 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 48 places, 102 transitions, 785 flow [2021-03-24 13:19:55,784 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 48 places, 102 transitions, 783 flow, removed 1 selfloop flow, removed 0 redundant places. [2021-03-24 13:19:55,787 INFO L241 Difference]: Finished difference. Result has 50 places, 71 transitions, 614 flow [2021-03-24 13:19:55,787 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=316, PETRI_DIFFERENCE_MINUEND_PLACES=42, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=49, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=28, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=17, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=614, PETRI_PLACES=50, PETRI_TRANSITIONS=71} [2021-03-24 13:19:55,787 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 21 predicate places. [2021-03-24 13:19:55,787 INFO L480 AbstractCegarLoop]: Abstraction has has 50 places, 71 transitions, 614 flow [2021-03-24 13:19:55,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 7.4) internal successors, (74), 10 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:55,788 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:55,788 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:19:56,009 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-03-24 13:19:56,010 INFO L428 AbstractCegarLoop]: === Iteration 4 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:56,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:56,010 INFO L82 PathProgramCache]: Analyzing trace with hash -326839718, now seen corresponding path program 1 times [2021-03-24 13:19:56,010 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:56,010 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039147869] [2021-03-24 13:19:56,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:56,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:56,019 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:56,019 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:56,022 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:56,023 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:56,027 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:56,028 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:56,028 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:56,028 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:56,034 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:56,034 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:56,040 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-24 13:19:56,040 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039147869] [2021-03-24 13:19:56,040 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:19:56,040 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-24 13:19:56,040 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359951628] [2021-03-24 13:19:56,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-24 13:19:56,041 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:56,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-24 13:19:56,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-03-24 13:19:56,041 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 30 [2021-03-24 13:19:56,041 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 50 places, 71 transitions, 614 flow. Second operand has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:56,041 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:56,041 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 30 [2021-03-24 13:19:56,042 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:56,804 INFO L129 PetriNetUnfolder]: 5320/8735 cut-off events. [2021-03-24 13:19:56,804 INFO L130 PetriNetUnfolder]: For 19029/19029 co-relation queries the response was YES. [2021-03-24 13:19:56,833 INFO L84 FinitePrefix]: Finished finitePrefix Result has 30477 conditions, 8735 events. 5320/8735 cut-off events. For 19029/19029 co-relation queries the response was YES. Maximal size of possible extension queue 688. Compared 61023 event pairs, 1737 based on Foata normal form. 22/7627 useless extension candidates. Maximal degree in co-relation 20071. Up to 3151 conditions per place. [2021-03-24 13:19:56,884 INFO L132 encePairwiseOnDemand]: 22/30 looper letters, 68 selfloop transitions, 65 changer transitions 0/135 dead transitions. [2021-03-24 13:19:56,884 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 56 places, 135 transitions, 1234 flow [2021-03-24 13:19:56,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-03-24 13:19:56,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-03-24 13:19:56,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 126 transitions. [2021-03-24 13:19:56,885 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6 [2021-03-24 13:19:56,885 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 126 transitions. [2021-03-24 13:19:56,886 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 126 transitions. [2021-03-24 13:19:56,886 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:56,886 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 126 transitions. [2021-03-24 13:19:56,886 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 18.0) internal successors, (126), 7 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:56,887 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 30.0) internal successors, (240), 8 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:56,887 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 30.0) internal successors, (240), 8 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:56,887 INFO L185 Difference]: Start difference. First operand has 50 places, 71 transitions, 614 flow. Second operand 7 states and 126 transitions. [2021-03-24 13:19:56,887 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 56 places, 135 transitions, 1234 flow [2021-03-24 13:19:56,911 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 53 places, 135 transitions, 1142 flow, removed 33 selfloop flow, removed 3 redundant places. [2021-03-24 13:19:56,914 INFO L241 Difference]: Finished difference. Result has 56 places, 92 transitions, 931 flow [2021-03-24 13:19:56,914 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=546, PETRI_DIFFERENCE_MINUEND_PLACES=47, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=71, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=53, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=16, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=931, PETRI_PLACES=56, PETRI_TRANSITIONS=92} [2021-03-24 13:19:56,914 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 27 predicate places. [2021-03-24 13:19:56,914 INFO L480 AbstractCegarLoop]: Abstraction has has 56 places, 92 transitions, 931 flow [2021-03-24 13:19:56,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:56,915 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:56,915 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:19:56,915 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-03-24 13:19:56,915 INFO L428 AbstractCegarLoop]: === Iteration 5 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:56,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:56,915 INFO L82 PathProgramCache]: Analyzing trace with hash -331798478, now seen corresponding path program 2 times [2021-03-24 13:19:56,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:56,915 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195998502] [2021-03-24 13:19:56,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:56,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:56,931 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:56,932 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:56,938 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:56,939 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:56,942 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:56,942 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:56,954 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:56,954 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:56,959 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:56,959 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:56,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:56,964 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195998502] [2021-03-24 13:19:56,965 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:19:56,965 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-03-24 13:19:56,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921666589] [2021-03-24 13:19:56,965 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-24 13:19:56,966 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:56,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-24 13:19:56,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-03-24 13:19:56,967 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 30 [2021-03-24 13:19:56,967 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 56 places, 92 transitions, 931 flow. Second operand has 7 states, 7 states have (on average 7.0) internal successors, (49), 7 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:56,967 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:56,967 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 30 [2021-03-24 13:19:56,967 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:57,843 INFO L129 PetriNetUnfolder]: 5107/8021 cut-off events. [2021-03-24 13:19:57,844 INFO L130 PetriNetUnfolder]: For 28788/28788 co-relation queries the response was YES. [2021-03-24 13:19:57,865 INFO L84 FinitePrefix]: Finished finitePrefix Result has 33295 conditions, 8021 events. 5107/8021 cut-off events. For 28788/28788 co-relation queries the response was YES. Maximal size of possible extension queue 622. Compared 51036 event pairs, 2212 based on Foata normal form. 76/6983 useless extension candidates. Maximal degree in co-relation 21675. Up to 5163 conditions per place. [2021-03-24 13:19:57,917 INFO L132 encePairwiseOnDemand]: 22/30 looper letters, 107 selfloop transitions, 47 changer transitions 0/156 dead transitions. [2021-03-24 13:19:57,917 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 156 transitions, 1507 flow [2021-03-24 13:19:57,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-03-24 13:19:57,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2021-03-24 13:19:57,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 180 transitions. [2021-03-24 13:19:57,919 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6 [2021-03-24 13:19:57,919 INFO L72 ComplementDD]: Start complementDD. Operand 10 states and 180 transitions. [2021-03-24 13:19:57,919 INFO L73 IsDeterministic]: Start isDeterministic. Operand 10 states and 180 transitions. [2021-03-24 13:19:57,919 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:57,919 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 10 states and 180 transitions. [2021-03-24 13:19:57,920 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 11 states, 10 states have (on average 18.0) internal successors, (180), 10 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:57,920 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 11 states, 11 states have (on average 30.0) internal successors, (330), 11 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:57,921 INFO L81 ComplementDD]: Finished complementDD. Result has 11 states, 11 states have (on average 30.0) internal successors, (330), 11 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:57,921 INFO L185 Difference]: Start difference. First operand has 56 places, 92 transitions, 931 flow. Second operand 10 states and 180 transitions. [2021-03-24 13:19:57,921 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 156 transitions, 1507 flow [2021-03-24 13:19:57,942 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 64 places, 156 transitions, 1492 flow, removed 5 selfloop flow, removed 1 redundant places. [2021-03-24 13:19:57,944 INFO L241 Difference]: Finished difference. Result has 67 places, 93 transitions, 1050 flow [2021-03-24 13:19:57,944 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=920, PETRI_DIFFERENCE_MINUEND_PLACES=55, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=92, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=46, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=46, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=1050, PETRI_PLACES=67, PETRI_TRANSITIONS=93} [2021-03-24 13:19:57,944 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 38 predicate places. [2021-03-24 13:19:57,944 INFO L480 AbstractCegarLoop]: Abstraction has has 67 places, 93 transitions, 1050 flow [2021-03-24 13:19:57,944 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 7.0) internal successors, (49), 7 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:57,944 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:57,945 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-03-24 13:19:57,945 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-03-24 13:19:57,945 INFO L428 AbstractCegarLoop]: === Iteration 6 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:57,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:57,945 INFO L82 PathProgramCache]: Analyzing trace with hash -1695986586, now seen corresponding path program 1 times [2021-03-24 13:19:57,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:57,945 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392772019] [2021-03-24 13:19:57,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:57,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:57,953 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:57,953 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:57,957 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:57,957 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:57,961 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:57,961 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:57,966 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:57,967 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:57,971 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:57,972 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:57,977 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:19:57,977 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392772019] [2021-03-24 13:19:57,977 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:19:57,977 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-03-24 13:19:57,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103863232] [2021-03-24 13:19:57,978 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-24 13:19:57,978 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:57,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-24 13:19:57,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-03-24 13:19:57,978 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 30 [2021-03-24 13:19:57,979 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 67 places, 93 transitions, 1050 flow. Second operand has 7 states, 7 states have (on average 7.142857142857143) internal successors, (50), 7 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:57,979 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:57,979 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 30 [2021-03-24 13:19:57,979 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:19:59,192 INFO L129 PetriNetUnfolder]: 6442/10148 cut-off events. [2021-03-24 13:19:59,193 INFO L130 PetriNetUnfolder]: For 50777/50777 co-relation queries the response was YES. [2021-03-24 13:19:59,230 INFO L84 FinitePrefix]: Finished finitePrefix Result has 44792 conditions, 10148 events. 6442/10148 cut-off events. For 50777/50777 co-relation queries the response was YES. Maximal size of possible extension queue 863. Compared 68587 event pairs, 3233 based on Foata normal form. 0/8733 useless extension candidates. Maximal degree in co-relation 32758. Up to 5206 conditions per place. [2021-03-24 13:19:59,343 INFO L132 encePairwiseOnDemand]: 22/30 looper letters, 90 selfloop transitions, 101 changer transitions 0/193 dead transitions. [2021-03-24 13:19:59,343 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 193 transitions, 2334 flow [2021-03-24 13:19:59,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-03-24 13:19:59,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2021-03-24 13:19:59,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 139 transitions. [2021-03-24 13:19:59,346 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5791666666666667 [2021-03-24 13:19:59,346 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 139 transitions. [2021-03-24 13:19:59,347 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 139 transitions. [2021-03-24 13:19:59,347 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:19:59,347 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 139 transitions. [2021-03-24 13:19:59,347 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 17.375) internal successors, (139), 8 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:59,348 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 30.0) internal successors, (270), 9 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:59,348 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 30.0) internal successors, (270), 9 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:59,348 INFO L185 Difference]: Start difference. First operand has 67 places, 93 transitions, 1050 flow. Second operand 8 states and 139 transitions. [2021-03-24 13:19:59,348 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 193 transitions, 2334 flow [2021-03-24 13:19:59,385 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 68 places, 193 transitions, 2134 flow, removed 25 selfloop flow, removed 6 redundant places. [2021-03-24 13:19:59,389 INFO L241 Difference]: Finished difference. Result has 73 places, 151 transitions, 1980 flow [2021-03-24 13:19:59,389 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=950, PETRI_DIFFERENCE_MINUEND_PLACES=61, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=93, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=52, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=1980, PETRI_PLACES=73, PETRI_TRANSITIONS=151} [2021-03-24 13:19:59,389 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 44 predicate places. [2021-03-24 13:19:59,389 INFO L480 AbstractCegarLoop]: Abstraction has has 73 places, 151 transitions, 1980 flow [2021-03-24 13:19:59,390 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 7.142857142857143) internal successors, (50), 7 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:59,390 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:19:59,390 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:19:59,390 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-03-24 13:19:59,390 INFO L428 AbstractCegarLoop]: === Iteration 7 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:19:59,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:19:59,390 INFO L82 PathProgramCache]: Analyzing trace with hash -1418921597, now seen corresponding path program 1 times [2021-03-24 13:19:59,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:19:59,390 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135778926] [2021-03-24 13:19:59,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:19:59,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:19:59,415 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:59,415 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:59,418 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:59,418 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:59,422 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:59,422 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:59,422 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:59,424 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:59,424 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:59,424 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:19:59,429 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:19:59,430 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:19:59,434 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-03-24 13:19:59,434 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135778926] [2021-03-24 13:19:59,434 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:19:59,434 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-24 13:19:59,434 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039646886] [2021-03-24 13:19:59,435 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-24 13:19:59,435 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:19:59,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-24 13:19:59,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-03-24 13:19:59,436 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 30 [2021-03-24 13:19:59,436 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 151 transitions, 1980 flow. Second operand has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:19:59,436 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:19:59,436 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 30 [2021-03-24 13:19:59,436 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:20:00,661 INFO L129 PetriNetUnfolder]: 6640/10548 cut-off events. [2021-03-24 13:20:00,661 INFO L130 PetriNetUnfolder]: For 66412/66412 co-relation queries the response was YES. [2021-03-24 13:20:00,705 INFO L84 FinitePrefix]: Finished finitePrefix Result has 52240 conditions, 10548 events. 6640/10548 cut-off events. For 66412/66412 co-relation queries the response was YES. Maximal size of possible extension queue 859. Compared 72233 event pairs, 3509 based on Foata normal form. 28/9925 useless extension candidates. Maximal degree in co-relation 32191. Up to 7574 conditions per place. [2021-03-24 13:20:00,864 INFO L132 encePairwiseOnDemand]: 22/30 looper letters, 115 selfloop transitions, 87 changer transitions 0/204 dead transitions. [2021-03-24 13:20:00,864 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 79 places, 204 transitions, 2836 flow [2021-03-24 13:20:00,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-03-24 13:20:00,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-03-24 13:20:00,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 123 transitions. [2021-03-24 13:20:00,866 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5857142857142857 [2021-03-24 13:20:00,866 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 123 transitions. [2021-03-24 13:20:00,866 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 123 transitions. [2021-03-24 13:20:00,866 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:20:00,866 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 123 transitions. [2021-03-24 13:20:00,866 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 17.571428571428573) internal successors, (123), 7 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:00,867 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 30.0) internal successors, (240), 8 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:00,867 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 30.0) internal successors, (240), 8 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:00,867 INFO L185 Difference]: Start difference. First operand has 73 places, 151 transitions, 1980 flow. Second operand 7 states and 123 transitions. [2021-03-24 13:20:00,867 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 79 places, 204 transitions, 2836 flow [2021-03-24 13:20:00,943 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 204 transitions, 2830 flow, removed 3 selfloop flow, removed 0 redundant places. [2021-03-24 13:20:00,948 INFO L241 Difference]: Finished difference. Result has 82 places, 166 transitions, 2504 flow [2021-03-24 13:20:00,948 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=1974, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=151, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=72, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=78, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=2504, PETRI_PLACES=82, PETRI_TRANSITIONS=166} [2021-03-24 13:20:00,948 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 53 predicate places. [2021-03-24 13:20:00,949 INFO L480 AbstractCegarLoop]: Abstraction has has 82 places, 166 transitions, 2504 flow [2021-03-24 13:20:00,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:00,949 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:20:00,949 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:20:00,949 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-03-24 13:20:00,949 INFO L428 AbstractCegarLoop]: === Iteration 8 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:20:00,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:20:00,949 INFO L82 PathProgramCache]: Analyzing trace with hash -560641713, now seen corresponding path program 2 times [2021-03-24 13:20:00,950 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:20:00,950 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358542681] [2021-03-24 13:20:00,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:20:00,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:20:00,960 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:00,960 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:20:00,963 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:00,963 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:20:00,967 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:00,968 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:20:00,970 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:00,970 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:20:00,974 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:00,974 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:20:00,979 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:00,979 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:20:00,985 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-24 13:20:00,985 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358542681] [2021-03-24 13:20:00,985 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:20:00,985 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-03-24 13:20:00,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043063086] [2021-03-24 13:20:00,986 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-24 13:20:00,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:20:00,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-24 13:20:00,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-03-24 13:20:00,987 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 30 [2021-03-24 13:20:00,987 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 82 places, 166 transitions, 2504 flow. Second operand has 7 states, 7 states have (on average 7.285714285714286) internal successors, (51), 7 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:00,987 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:20:00,987 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 30 [2021-03-24 13:20:00,987 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:20:02,571 INFO L129 PetriNetUnfolder]: 8431/14360 cut-off events. [2021-03-24 13:20:02,571 INFO L130 PetriNetUnfolder]: For 97472/97472 co-relation queries the response was YES. [2021-03-24 13:20:02,635 INFO L84 FinitePrefix]: Finished finitePrefix Result has 71062 conditions, 14360 events. 8431/14360 cut-off events. For 97472/97472 co-relation queries the response was YES. Maximal size of possible extension queue 1269. Compared 115812 event pairs, 2188 based on Foata normal form. 14/13519 useless extension candidates. Maximal degree in co-relation 42790. Up to 4522 conditions per place. [2021-03-24 13:20:02,757 INFO L132 encePairwiseOnDemand]: 22/30 looper letters, 71 selfloop transitions, 169 changer transitions 0/242 dead transitions. [2021-03-24 13:20:02,758 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 89 places, 242 transitions, 3588 flow [2021-03-24 13:20:02,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-03-24 13:20:02,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2021-03-24 13:20:02,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 142 transitions. [2021-03-24 13:20:02,759 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5916666666666667 [2021-03-24 13:20:02,759 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 142 transitions. [2021-03-24 13:20:02,759 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 142 transitions. [2021-03-24 13:20:02,759 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:20:02,759 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 142 transitions. [2021-03-24 13:20:02,760 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 17.75) internal successors, (142), 8 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:02,761 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 30.0) internal successors, (270), 9 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:02,761 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 30.0) internal successors, (270), 9 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:02,762 INFO L185 Difference]: Start difference. First operand has 82 places, 166 transitions, 2504 flow. Second operand 8 states and 142 transitions. [2021-03-24 13:20:02,762 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 89 places, 242 transitions, 3588 flow [2021-03-24 13:20:02,940 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 88 places, 242 transitions, 3551 flow, removed 1 selfloop flow, removed 1 redundant places. [2021-03-24 13:20:02,944 INFO L241 Difference]: Finished difference. Result has 92 places, 196 transitions, 3447 flow [2021-03-24 13:20:02,945 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=2467, PETRI_DIFFERENCE_MINUEND_PLACES=81, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=166, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=146, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=18, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=3447, PETRI_PLACES=92, PETRI_TRANSITIONS=196} [2021-03-24 13:20:02,945 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 63 predicate places. [2021-03-24 13:20:02,945 INFO L480 AbstractCegarLoop]: Abstraction has has 92 places, 196 transitions, 3447 flow [2021-03-24 13:20:02,945 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 7.285714285714286) internal successors, (51), 7 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:02,945 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:20:02,945 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:20:02,945 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-03-24 13:20:02,945 INFO L428 AbstractCegarLoop]: === Iteration 9 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:20:02,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:20:02,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1035968863, now seen corresponding path program 1 times [2021-03-24 13:20:02,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:20:02,946 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437405675] [2021-03-24 13:20:02,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:20:02,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:20:02,961 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:02,962 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:20:02,965 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:02,965 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:20:02,968 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:02,969 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:20:02,974 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:02,974 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:20:02,979 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:02,980 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:20:02,985 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:02,992 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:20:02,998 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:20:02,998 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437405675] [2021-03-24 13:20:02,998 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:20:02,998 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-03-24 13:20:02,998 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611820354] [2021-03-24 13:20:02,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-03-24 13:20:02,999 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:20:02,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-03-24 13:20:02,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-03-24 13:20:02,999 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 30 [2021-03-24 13:20:02,999 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 92 places, 196 transitions, 3447 flow. Second operand has 8 states, 8 states have (on average 7.125) internal successors, (57), 8 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:02,999 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:20:02,999 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 30 [2021-03-24 13:20:03,000 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:20:04,477 INFO L129 PetriNetUnfolder]: 8245/13298 cut-off events. [2021-03-24 13:20:04,477 INFO L130 PetriNetUnfolder]: For 146568/146568 co-relation queries the response was YES. [2021-03-24 13:20:04,540 INFO L84 FinitePrefix]: Finished finitePrefix Result has 77541 conditions, 13298 events. 8245/13298 cut-off events. For 146568/146568 co-relation queries the response was YES. Maximal size of possible extension queue 1158. Compared 97100 event pairs, 4068 based on Foata normal form. 66/12515 useless extension candidates. Maximal degree in co-relation 56674. Up to 7843 conditions per place. [2021-03-24 13:20:04,741 INFO L132 encePairwiseOnDemand]: 22/30 looper letters, 127 selfloop transitions, 120 changer transitions 0/249 dead transitions. [2021-03-24 13:20:04,742 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 102 places, 249 transitions, 4223 flow [2021-03-24 13:20:04,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-03-24 13:20:04,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2021-03-24 13:20:04,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 180 transitions. [2021-03-24 13:20:04,744 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5454545454545454 [2021-03-24 13:20:04,744 INFO L72 ComplementDD]: Start complementDD. Operand 11 states and 180 transitions. [2021-03-24 13:20:04,744 INFO L73 IsDeterministic]: Start isDeterministic. Operand 11 states and 180 transitions. [2021-03-24 13:20:04,745 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:20:04,745 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 11 states and 180 transitions. [2021-03-24 13:20:04,747 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 12 states, 11 states have (on average 16.363636363636363) internal successors, (180), 11 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:04,747 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 12 states, 12 states have (on average 30.0) internal successors, (360), 12 states have internal predecessors, (360), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:04,747 INFO L81 ComplementDD]: Finished complementDD. Result has 12 states, 12 states have (on average 30.0) internal successors, (360), 12 states have internal predecessors, (360), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:04,747 INFO L185 Difference]: Start difference. First operand has 92 places, 196 transitions, 3447 flow. Second operand 11 states and 180 transitions. [2021-03-24 13:20:04,747 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 102 places, 249 transitions, 4223 flow [2021-03-24 13:20:04,982 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 100 places, 249 transitions, 4111 flow, removed 35 selfloop flow, removed 2 redundant places. [2021-03-24 13:20:04,987 INFO L241 Difference]: Finished difference. Result has 103 places, 198 transitions, 3687 flow [2021-03-24 13:20:04,987 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=3345, PETRI_DIFFERENCE_MINUEND_PLACES=90, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=196, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=118, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=78, PETRI_DIFFERENCE_SUBTRAHEND_STATES=11, PETRI_FLOW=3687, PETRI_PLACES=103, PETRI_TRANSITIONS=198} [2021-03-24 13:20:04,987 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 74 predicate places. [2021-03-24 13:20:04,988 INFO L480 AbstractCegarLoop]: Abstraction has has 103 places, 198 transitions, 3687 flow [2021-03-24 13:20:04,988 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 7.125) internal successors, (57), 8 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:04,988 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:20:04,988 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:20:04,988 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-03-24 13:20:04,988 INFO L428 AbstractCegarLoop]: === Iteration 10 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:20:04,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:20:04,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1037205926, now seen corresponding path program 1 times [2021-03-24 13:20:04,988 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:20:04,988 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768166390] [2021-03-24 13:20:04,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:20:04,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:20:05,008 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:05,009 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:20:05,011 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:05,013 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:20:05,016 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:05,017 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:20:05,018 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:05,018 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:20:05,019 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:05,019 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:20:05,019 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:05,020 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:20:05,023 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:20:05,024 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:20:05,028 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-03-24 13:20:05,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768166390] [2021-03-24 13:20:05,029 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:20:05,029 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-24 13:20:05,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760148664] [2021-03-24 13:20:05,029 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-03-24 13:20:05,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:20:05,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-03-24 13:20:05,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-03-24 13:20:05,030 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 30 [2021-03-24 13:20:05,030 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 103 places, 198 transitions, 3687 flow. Second operand has 6 states, 6 states have (on average 7.5) internal successors, (45), 6 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:05,030 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:20:05,030 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 30 [2021-03-24 13:20:05,030 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:20:06,683 INFO L129 PetriNetUnfolder]: 9233/14967 cut-off events. [2021-03-24 13:20:06,684 INFO L130 PetriNetUnfolder]: For 179670/179670 co-relation queries the response was YES. [2021-03-24 13:20:06,748 INFO L84 FinitePrefix]: Finished finitePrefix Result has 91265 conditions, 14967 events. 9233/14967 cut-off events. For 179670/179670 co-relation queries the response was YES. Maximal size of possible extension queue 1262. Compared 111989 event pairs, 4788 based on Foata normal form. 96/14166 useless extension candidates. Maximal degree in co-relation 61145. Up to 10411 conditions per place. [2021-03-24 13:20:06,831 INFO L132 encePairwiseOnDemand]: 22/30 looper letters, 165 selfloop transitions, 138 changer transitions 0/305 dead transitions. [2021-03-24 13:20:06,831 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 111 places, 305 transitions, 5856 flow [2021-03-24 13:20:06,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-03-24 13:20:06,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2021-03-24 13:20:06,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 157 transitions. [2021-03-24 13:20:06,832 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5814814814814815 [2021-03-24 13:20:06,832 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 157 transitions. [2021-03-24 13:20:06,833 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 157 transitions. [2021-03-24 13:20:06,833 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:20:06,833 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 157 transitions. [2021-03-24 13:20:06,833 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 17.444444444444443) internal successors, (157), 9 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:06,834 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 30.0) internal successors, (300), 10 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:06,834 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 30.0) internal successors, (300), 10 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:06,834 INFO L185 Difference]: Start difference. First operand has 103 places, 198 transitions, 3687 flow. Second operand 9 states and 157 transitions. [2021-03-24 13:20:06,834 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 111 places, 305 transitions, 5856 flow [2021-03-24 13:20:07,279 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 104 places, 305 transitions, 5494 flow, removed 13 selfloop flow, removed 7 redundant places. [2021-03-24 13:20:07,286 INFO L241 Difference]: Finished difference. Result has 107 places, 249 transitions, 4909 flow [2021-03-24 13:20:07,287 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=3437, PETRI_DIFFERENCE_MINUEND_PLACES=96, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=198, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=87, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=96, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=4909, PETRI_PLACES=107, PETRI_TRANSITIONS=249} [2021-03-24 13:20:07,287 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 78 predicate places. [2021-03-24 13:20:07,287 INFO L480 AbstractCegarLoop]: Abstraction has has 107 places, 249 transitions, 4909 flow [2021-03-24 13:20:07,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 7.5) internal successors, (45), 6 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:20:07,287 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:20:07,287 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:20:07,287 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-03-24 13:20:07,288 INFO L428 AbstractCegarLoop]: === Iteration 11 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:20:07,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:20:07,288 INFO L82 PathProgramCache]: Analyzing trace with hash -200333294, now seen corresponding path program 1 times [2021-03-24 13:20:07,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:20:07,288 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609130835] [2021-03-24 13:20:07,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:20:07,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:20:07,292 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:20:07,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:20:07,294 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:20:07,295 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:20:07,296 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:20:07,296 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-03-24 13:20:07,313 INFO L202 PluginConnector]: Adding new model fork_loop_unsafe.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.03 01:20:07 BasicIcfg [2021-03-24 13:20:07,313 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-24 13:20:07,317 INFO L168 Benchmark]: Toolchain (without parser) took 16127.66 ms. Allocated memory was 255.9 MB in the beginning and 7.3 GB in the end (delta: 7.1 GB). Free memory was 236.8 MB in the beginning and 6.7 GB in the end (delta: -6.5 GB). Peak memory consumption was 605.8 MB. Max. memory is 16.0 GB. [2021-03-24 13:20:07,317 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 255.9 MB. Free memory is still 237.7 MB. There was no memory consumed. Max. memory is 16.0 GB. [2021-03-24 13:20:07,317 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.02 ms. Allocated memory is still 255.9 MB. Free memory was 236.6 MB in the beginning and 235.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-24 13:20:07,317 INFO L168 Benchmark]: Boogie Preprocessor took 12.68 ms. Allocated memory is still 255.9 MB. Free memory was 235.2 MB in the beginning and 234.3 MB in the end (delta: 919.5 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-24 13:20:07,318 INFO L168 Benchmark]: RCFGBuilder took 167.89 ms. Allocated memory is still 255.9 MB. Free memory was 234.3 MB in the beginning and 239.7 MB in the end (delta: -5.4 MB). Peak memory consumption was 18.2 MB. Max. memory is 16.0 GB. [2021-03-24 13:20:07,318 INFO L168 Benchmark]: TraceAbstraction took 15916.29 ms. Allocated memory was 255.9 MB in the beginning and 7.3 GB in the end (delta: 7.1 GB). Free memory was 239.2 MB in the beginning and 6.7 GB in the end (delta: -6.5 GB). Peak memory consumption was 606.4 MB. Max. memory is 16.0 GB. [2021-03-24 13:20:07,319 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 255.9 MB. Free memory is still 237.7 MB. There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 24.02 ms. Allocated memory is still 255.9 MB. Free memory was 236.6 MB in the beginning and 235.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 12.68 ms. Allocated memory is still 255.9 MB. Free memory was 235.2 MB in the beginning and 234.3 MB in the end (delta: 919.5 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 167.89 ms. Allocated memory is still 255.9 MB. Free memory was 234.3 MB in the beginning and 239.7 MB in the end (delta: -5.4 MB). Peak memory consumption was 18.2 MB. Max. memory is 16.0 GB. * TraceAbstraction took 15916.29 ms. Allocated memory was 255.9 MB in the beginning and 7.3 GB in the end (delta: 7.1 GB). Free memory was 239.2 MB in the beginning and 6.7 GB in the end (delta: -6.5 GB). Peak memory consumption was 606.4 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 141.5ms, 13 PlacesBefore, 10 PlacesAfterwards, 10 TransitionsBefore, 7 TransitionsAfterwards, 24 CoEnabledTransitionPairs, 3 FixpointIterations, 1 TrivialSequentialCompositions, 3 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 4 TotalNumberOfCompositions, 9 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 9, positive: 9, positive conditional: 0, positive unconditional: 9, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 6, positive: 6, positive conditional: 0, positive unconditional: 6, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: SyntacticIndependenceRelation.Independence Queries: [ total: 6, positive: 6, positive conditional: 0, positive unconditional: 6, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Cache Queries: [ total: 9, positive: 3, positive conditional: 0, positive unconditional: 3, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 6, unknown conditional: 0, unknown unconditional: 6] , Statistics on independence cache: Total cache size (in pairs): 0, Positive cache size: 0, Positive conditional cache size: 0, Positive unconditional cache size: 0, Negative cache size: 0, Negative conditional cache size: 0, Negative unconditional cache size: 0 - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 59.7ms, 20 PlacesBefore, 17 PlacesAfterwards, 15 TransitionsBefore, 12 TransitionsAfterwards, 88 CoEnabledTransitionPairs, 2 FixpointIterations, 1 TrivialSequentialCompositions, 2 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 3 TotalNumberOfCompositions, 112 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 63, positive: 49, positive conditional: 0, positive unconditional: 49, negative: 14, negative conditional: 0, negative unconditional: 14, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 43, positive: 36, positive conditional: 0, positive unconditional: 36, negative: 7, negative conditional: 0, negative unconditional: 7, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: SyntacticIndependenceRelation.Independence Queries: [ total: 43, positive: 36, positive conditional: 0, positive unconditional: 36, negative: 7, negative conditional: 0, negative unconditional: 7, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Cache Queries: [ total: 63, positive: 13, positive conditional: 0, positive unconditional: 13, negative: 7, negative conditional: 0, negative unconditional: 7, unknown: 43, unknown conditional: 0, unknown unconditional: 43] , Statistics on independence cache: Total cache size (in pairs): 20, Positive cache size: 15, Positive conditional cache size: 0, Positive unconditional cache size: 15, Negative cache size: 5, Negative conditional cache size: 0, Negative unconditional cache size: 5 - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 40.6ms, 27 PlacesBefore, 23 PlacesAfterwards, 20 TransitionsBefore, 16 TransitionsAfterwards, 192 CoEnabledTransitionPairs, 2 FixpointIterations, 1 TrivialSequentialCompositions, 3 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 4 TotalNumberOfCompositions, 310 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 170, positive: 145, positive conditional: 0, positive unconditional: 145, negative: 25, negative conditional: 0, negative unconditional: 25, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 91, positive: 78, positive conditional: 0, positive unconditional: 78, negative: 13, negative conditional: 0, negative unconditional: 13, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: SyntacticIndependenceRelation.Independence Queries: [ total: 91, positive: 78, positive conditional: 0, positive unconditional: 78, negative: 13, negative conditional: 0, negative unconditional: 13, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Cache Queries: [ total: 170, positive: 67, positive conditional: 0, positive unconditional: 67, negative: 12, negative conditional: 0, negative unconditional: 12, unknown: 91, unknown conditional: 0, unknown unconditional: 91] , Statistics on independence cache: Total cache size (in pairs): 43, Positive cache size: 34, Positive conditional cache size: 0, Positive unconditional cache size: 34, Negative cache size: 9, Negative conditional cache size: 0, Negative unconditional cache size: 9 - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 49.3ms, 34 PlacesBefore, 29 PlacesAfterwards, 25 TransitionsBefore, 20 TransitionsAfterwards, 336 CoEnabledTransitionPairs, 2 FixpointIterations, 1 TrivialSequentialCompositions, 4 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 5 TotalNumberOfCompositions, 576 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 134, positive: 100, positive conditional: 0, positive unconditional: 100, negative: 34, negative conditional: 0, negative unconditional: 34, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 84, positive: 66, positive conditional: 0, positive unconditional: 66, negative: 18, negative conditional: 0, negative unconditional: 18, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: SyntacticIndependenceRelation.Independence Queries: [ total: 84, positive: 66, positive conditional: 0, positive unconditional: 66, negative: 18, negative conditional: 0, negative unconditional: 18, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Cache Queries: [ total: 134, positive: 34, positive conditional: 0, positive unconditional: 34, negative: 16, negative conditional: 0, negative unconditional: 16, unknown: 84, unknown conditional: 0, unknown unconditional: 84] , Statistics on independence cache: Total cache size (in pairs): 20, Positive cache size: 6, Positive conditional cache size: 0, Positive unconditional cache size: 6, Negative cache size: 14, Negative conditional cache size: 0, Negative unconditional cache size: 14 - CounterExampleResult [Line: 17]: assertion can be violated assertion can be violated We found a FailurePath: [L24] 0 x := 0; [L25] 0 i := 0; VAL [i=0, x=0] [L28] FORK 0 fork i thread(i); VAL [i=0, x=0, y=0] [L16] 1 x := x + 1; VAL [i=0, x=1, y=0] [L29] 0 i := i + 1; VAL [i=1, x=1, y=0] [L28] FORK 0 fork i thread(i); VAL [i=1, x=1, y=0] [L29] 0 i := i + 1; VAL [i=2, x=1, y=0] [L16] 2 x := x + 1; VAL [i=2, x=2, y=0] [L28] FORK 0 fork i thread(i); VAL [i=2, x=2, y=0] [L16] 3 x := x + 1; VAL [i=2, x=3, y=0] [L17] 1 assert x <= y + 2; VAL [i=2, x=3, y=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 10 locations, 1 error locations. Started 4 CEGAR loops. EmptinessCheckTime: 7.3ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: UNSAFE, OverallTime: 15790.2ms, OverallIterations: 21, TraceHistogramMax: 3, EmptinessCheckTime: 0.0ms, AutomataDifference: 13689.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 358.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 53 SDtfs, 710 SDslu, 64 SDs, 0 SdLazy, 2049 SolverSat, 274 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1262.2ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 136 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 665.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=4909occurred in iteration=10, InterpolantAutomatonStates: 124, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 25.1ms SsaConstructionTime, 119.2ms SatisfiabilityAnalysisTime, 843.2ms InterpolantComputationTime, 156 NumberOfCodeBlocks, 156 NumberOfCodeBlocksAsserted, 23 NumberOfCheckSat, 109 ConstructedInterpolants, 0 QuantifiedInterpolants, 459 SizeOfPredicates, 2 NumberOfNonLiveVariables, 42 ConjunctsInSsa, 12 ConjunctsInUnsatCore, 19 InterpolantComputations, 15 PerfectInterpolantSequences, 26/30 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...