/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-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-7cd14b8b9f04096d8ddfd3d9cd8a4ac590fe5404-7cd14b8 [2021-03-11 04:26:01,768 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-11 04:26:01,771 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-11 04:26:01,807 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-03-11 04:26:01,807 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-03-11 04:26:01,809 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-03-11 04:26:01,810 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-03-11 04:26:01,812 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-03-11 04:26:01,813 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-03-11 04:26:01,814 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-03-11 04:26:01,816 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-03-11 04:26:01,817 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-03-11 04:26:01,817 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-03-11 04:26:01,818 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-03-11 04:26:01,819 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-03-11 04:26:01,820 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-03-11 04:26:01,821 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-03-11 04:26:01,822 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-03-11 04:26:01,823 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-03-11 04:26:01,826 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-03-11 04:26:01,827 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-03-11 04:26:01,829 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-03-11 04:26:01,830 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-03-11 04:26:01,831 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-03-11 04:26:01,833 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-03-11 04:26:01,834 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-03-11 04:26:01,834 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-03-11 04:26:01,835 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-03-11 04:26:01,836 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-03-11 04:26:01,837 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-03-11 04:26:01,837 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-03-11 04:26:01,838 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-03-11 04:26:01,839 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-03-11 04:26:01,839 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-03-11 04:26:01,840 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-03-11 04:26:01,841 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-03-11 04:26:01,841 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-03-11 04:26:01,841 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-03-11 04:26:01,842 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-03-11 04:26:01,842 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-03-11 04:26:01,843 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-03-11 04:26:01,844 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-NoLbe.epf [2021-03-11 04:26:01,866 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-11 04:26:01,867 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-11 04:26:01,868 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-11 04:26:01,869 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-11 04:26:01,869 INFO L138 SettingsManager]: * Use SBE=true [2021-03-11 04:26:01,869 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-11 04:26:01,869 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-11 04:26:01,869 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-11 04:26:01,870 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-11 04:26:01,870 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-11 04:26:01,870 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-11 04:26:01,870 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-11 04:26:01,870 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-11 04:26:01,870 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-11 04:26:01,871 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-11 04:26:01,871 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-11 04:26:01,871 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-11 04:26:01,871 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-11 04:26:01,871 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-11 04:26:01,871 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-11 04:26:01,872 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-11 04:26:01,872 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-11 04:26:01,872 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-11 04:26:01,872 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-11 04:26:01,872 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-11 04:26:01,872 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-11 04:26:01,872 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-11 04:26:01,872 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-03-11 04:26:01,873 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-11 04:26:01,873 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-11 04:26:02,254 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-11 04:26:02,284 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-11 04:26:02,287 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-11 04:26:02,288 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-11 04:26:02,290 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-11 04:26:02,291 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl [2021-03-11 04:26:02,291 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl' [2021-03-11 04:26:02,314 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-11 04:26:02,319 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-11 04:26:02,320 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-11 04:26:02,320 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-11 04:26:02,320 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-11 04:26:02,334 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:26:02" (1/1) ... [2021-03-11 04:26:02,340 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:26:02" (1/1) ... [2021-03-11 04:26:02,348 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-11 04:26:02,349 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-11 04:26:02,349 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-11 04:26:02,349 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-11 04:26:02,357 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:26:02" (1/1) ... [2021-03-11 04:26:02,358 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:26:02" (1/1) ... [2021-03-11 04:26:02,358 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:26:02" (1/1) ... [2021-03-11 04:26:02,358 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:26:02" (1/1) ... [2021-03-11 04:26:02,360 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:26:02" (1/1) ... [2021-03-11 04:26:02,363 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:26:02" (1/1) ... [2021-03-11 04:26:02,364 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:26:02" (1/1) ... [2021-03-11 04:26:02,365 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-11 04:26:02,366 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-11 04:26:02,366 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-11 04:26:02,366 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-11 04:26:02,367 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:26:02" (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 [2021-03-11 04:26:02,429 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-11 04:26:02,429 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-11 04:26:02,429 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-11 04:26:02,429 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2021-03-11 04:26:02,430 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2021-03-11 04:26:02,430 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2021-03-11 04:26:02,431 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-11 04:26:02,554 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-11 04:26:02,554 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-03-11 04:26:02,557 INFO L202 PluginConnector]: Adding new model fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.03 04:26:02 BoogieIcfgContainer [2021-03-11 04:26:02,557 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-11 04:26:02,561 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-11 04:26:02,561 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-11 04:26:02,564 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-11 04:26:02,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:26:02" (1/2) ... [2021-03-11 04:26:02,566 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a4b8216 and model type fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.03 04:26:02, skipping insertion in model container [2021-03-11 04:26:02,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.03 04:26:02" (2/2) ... [2021-03-11 04:26:02,567 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_loop_inc.bpl [2021-03-11 04:26:02,577 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-11 04:26:02,581 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-11 04:26:02,582 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-11 04:26:02,627 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:02,647 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:02,682 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:02,683 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:02,685 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:02,685 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:02,686 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:02,686 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:02,686 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:02,686 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:02,696 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 11 places, 8 transitions, 21 flow [2021-03-11 04:26:02,717 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-11 04:26:02,718 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:02,720 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 5. Compared 19 event pairs, 0 based on Foata normal form. 0/9 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-11 04:26:02,720 INFO L82 GeneralOperation]: Start removeDead. Operand has 11 places, 8 transitions, 21 flow [2021-03-11 04:26:02,724 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 9 places, 6 transitions, 17 flow [2021-03-11 04:26:02,730 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-11 04:26:02,731 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:02,731 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:02,732 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:02,733 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:02,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:02,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1315, now seen corresponding path program 1 times [2021-03-11 04:26:02,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:02,754 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893906482] [2021-03-11 04:26:02,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:02,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:02,881 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:02,883 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:02,904 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:02,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893906482] [2021-03-11 04:26:02,907 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:02,907 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:02,908 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703650188] [2021-03-11 04:26:02,917 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:02,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:02,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:02,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:02,933 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 8 [2021-03-11 04:26:02,936 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 9 places, 6 transitions, 17 flow. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-03-11 04:26:02,937 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:02,937 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 8 [2021-03-11 04:26:02,938 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:02,959 INFO L129 PetriNetUnfolder]: 0/5 cut-off events. [2021-03-11 04:26:02,959 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:02,960 INFO L84 FinitePrefix]: Finished finitePrefix Result has 13 conditions, 5 events. 0/5 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 1 event pairs, 0 based on Foata normal form. 3/8 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-11 04:26:02,961 INFO L132 encePairwiseOnDemand]: 6/8 looper letters, 1 selfloop transitions, 1 changer transitions 0/5 dead transitions. [2021-03-11 04:26:02,962 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 10 places, 5 transitions, 19 flow [2021-03-11 04:26:02,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:02,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:02,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 15 transitions. [2021-03-11 04:26:02,974 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.625 [2021-03-11 04:26:02,975 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 15 transitions. [2021-03-11 04:26:02,975 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 15 transitions. [2021-03-11 04:26:02,976 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:02,978 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 15 transitions. [2021-03-11 04:26:02,980 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 5.0) internal successors, (15), 3 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) [2021-03-11 04:26:02,988 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 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) [2021-03-11 04:26:02,990 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 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) [2021-03-11 04:26:02,993 INFO L185 Difference]: Start difference. First operand has 9 places, 6 transitions, 17 flow. Second operand 3 states and 15 transitions. [2021-03-11 04:26:02,994 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 10 places, 5 transitions, 19 flow [2021-03-11 04:26:02,997 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 10 places, 5 transitions, 19 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:02,999 INFO L241 Difference]: Finished difference. Result has 10 places, 5 transitions, 17 flow [2021-03-11 04:26:03,001 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=8, PETRI_DIFFERENCE_MINUEND_FLOW=15, PETRI_DIFFERENCE_MINUEND_PLACES=8, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=5, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=4, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=17, PETRI_PLACES=10, PETRI_TRANSITIONS=5} [2021-03-11 04:26:03,003 INFO L335 CegarLoopForPetriNet]: 9 programPoint places, 1 predicate places. [2021-03-11 04:26:03,004 INFO L480 AbstractCegarLoop]: Abstraction has has 10 places, 5 transitions, 17 flow [2021-03-11 04:26:03,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-03-11 04:26:03,004 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,005 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2021-03-11 04:26:03,005 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-11 04:26:03,005 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,006 INFO L82 PathProgramCache]: Analyzing trace with hash 41033, now seen corresponding path program 1 times [2021-03-11 04:26:03,007 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,008 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949297871] [2021-03-11 04:26:03,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,016 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,029 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,043 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:03,044 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:03,045 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-11 04:26:03,045 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:03,046 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-03-11 04:26:03,062 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:03,062 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:03,066 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:03,067 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:03,067 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:03,067 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:03,067 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:03,067 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:03,067 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:03,067 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:03,068 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 16 places, 11 transitions, 34 flow [2021-03-11 04:26:03,076 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-03-11 04:26:03,076 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,076 INFO L84 FinitePrefix]: Finished finitePrefix Result has 27 conditions, 17 events. 0/17 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 39 event pairs, 0 based on Foata normal form. 0/14 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-11 04:26:03,077 INFO L82 GeneralOperation]: Start removeDead. Operand has 16 places, 11 transitions, 34 flow [2021-03-11 04:26:03,077 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 14 places, 9 transitions, 30 flow [2021-03-11 04:26:03,080 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-11 04:26:03,080 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,080 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,081 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:03,081 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,082 INFO L82 PathProgramCache]: Analyzing trace with hash 1667, now seen corresponding path program 1 times [2021-03-11 04:26:03,083 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,083 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763431923] [2021-03-11 04:26:03,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:03,097 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:03,111 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:03,119 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:03,120 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763431923] [2021-03-11 04:26:03,120 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:03,120 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:03,120 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113727225] [2021-03-11 04:26:03,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:03,121 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:03,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:03,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:03,123 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 11 [2021-03-11 04:26:03,123 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 14 places, 9 transitions, 30 flow. Second operand has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 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) [2021-03-11 04:26:03,123 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:03,123 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 11 [2021-03-11 04:26:03,123 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:03,142 INFO L129 PetriNetUnfolder]: 1/11 cut-off events. [2021-03-11 04:26:03,143 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,147 INFO L84 FinitePrefix]: Finished finitePrefix Result has 27 conditions, 11 events. 1/11 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 13 event pairs, 1 based on Foata normal form. 6/16 useless extension candidates. Maximal degree in co-relation 11. Up to 5 conditions per place. [2021-03-11 04:26:03,148 INFO L132 encePairwiseOnDemand]: 9/11 looper letters, 2 selfloop transitions, 1 changer transitions 0/8 dead transitions. [2021-03-11 04:26:03,149 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 15 places, 8 transitions, 34 flow [2021-03-11 04:26:03,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:03,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:03,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 22 transitions. [2021-03-11 04:26:03,160 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.6666666666666666 [2021-03-11 04:26:03,160 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 22 transitions. [2021-03-11 04:26:03,160 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 22 transitions. [2021-03-11 04:26:03,160 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:03,160 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 22 transitions. [2021-03-11 04:26:03,160 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 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) [2021-03-11 04:26:03,161 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 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) [2021-03-11 04:26:03,161 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 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) [2021-03-11 04:26:03,161 INFO L185 Difference]: Start difference. First operand has 14 places, 9 transitions, 30 flow. Second operand 3 states and 22 transitions. [2021-03-11 04:26:03,161 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 15 places, 8 transitions, 34 flow [2021-03-11 04:26:03,162 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 15 places, 8 transitions, 32 flow, removed 1 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:03,162 INFO L241 Difference]: Finished difference. Result has 15 places, 8 transitions, 28 flow [2021-03-11 04:26:03,162 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=11, PETRI_DIFFERENCE_MINUEND_FLOW=26, PETRI_DIFFERENCE_MINUEND_PLACES=13, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=8, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=7, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=28, PETRI_PLACES=15, PETRI_TRANSITIONS=8} [2021-03-11 04:26:03,162 INFO L335 CegarLoopForPetriNet]: 14 programPoint places, 1 predicate places. [2021-03-11 04:26:03,163 INFO L480 AbstractCegarLoop]: Abstraction has has 15 places, 8 transitions, 28 flow [2021-03-11 04:26:03,163 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 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) [2021-03-11 04:26:03,163 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,163 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-11 04:26:03,163 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-11 04:26:03,163 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,164 INFO L82 PathProgramCache]: Analyzing trace with hash 1612715, now seen corresponding path program 1 times [2021-03-11 04:26:03,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,164 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323205721] [2021-03-11 04:26:03,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,168 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,170 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,172 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:03,172 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:03,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-11 04:26:03,172 WARN L342 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:03,174 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-03-11 04:26:03,184 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:03,184 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:03,185 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:03,185 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:03,185 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:03,185 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:03,185 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:03,185 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:03,186 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:03,186 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:03,186 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 14 transitions, 49 flow [2021-03-11 04:26:03,190 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-11 04:26:03,191 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,191 INFO L84 FinitePrefix]: Finished finitePrefix Result has 39 conditions, 23 events. 0/23 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 66 event pairs, 0 based on Foata normal form. 0/19 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-11 04:26:03,191 INFO L82 GeneralOperation]: Start removeDead. Operand has 21 places, 14 transitions, 49 flow [2021-03-11 04:26:03,191 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 19 places, 12 transitions, 45 flow [2021-03-11 04:26:03,192 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-11 04:26:03,192 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,193 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,193 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:03,193 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,193 INFO L82 PathProgramCache]: Analyzing trace with hash 2115, now seen corresponding path program 1 times [2021-03-11 04:26:03,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,194 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193436733] [2021-03-11 04:26:03,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:03,200 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:03,201 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:03,206 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:03,207 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193436733] [2021-03-11 04:26:03,207 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:03,207 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:03,207 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286107163] [2021-03-11 04:26:03,207 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:03,207 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:03,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:03,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:03,208 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 14 [2021-03-11 04:26:03,209 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 19 places, 12 transitions, 45 flow. Second operand has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 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) [2021-03-11 04:26:03,209 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:03,209 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 14 [2021-03-11 04:26:03,209 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:03,226 INFO L129 PetriNetUnfolder]: 5/24 cut-off events. [2021-03-11 04:26:03,226 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,226 INFO L84 FinitePrefix]: Finished finitePrefix Result has 54 conditions, 24 events. 5/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 58 event pairs, 5 based on Foata normal form. 11/32 useless extension candidates. Maximal degree in co-relation 31. Up to 13 conditions per place. [2021-03-11 04:26:03,227 INFO L132 encePairwiseOnDemand]: 12/14 looper letters, 3 selfloop transitions, 1 changer transitions 0/11 dead transitions. [2021-03-11 04:26:03,227 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 20 places, 11 transitions, 51 flow [2021-03-11 04:26:03,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:03,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:03,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 29 transitions. [2021-03-11 04:26:03,228 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.6904761904761905 [2021-03-11 04:26:03,228 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 29 transitions. [2021-03-11 04:26:03,228 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 29 transitions. [2021-03-11 04:26:03,229 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:03,229 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 29 transitions. [2021-03-11 04:26:03,229 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 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) [2021-03-11 04:26:03,230 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 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) [2021-03-11 04:26:03,230 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 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) [2021-03-11 04:26:03,230 INFO L185 Difference]: Start difference. First operand has 19 places, 12 transitions, 45 flow. Second operand 3 states and 29 transitions. [2021-03-11 04:26:03,230 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 20 places, 11 transitions, 51 flow [2021-03-11 04:26:03,231 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 20 places, 11 transitions, 45 flow, removed 3 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:03,231 INFO L241 Difference]: Finished difference. Result has 20 places, 11 transitions, 39 flow [2021-03-11 04:26:03,231 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=14, PETRI_DIFFERENCE_MINUEND_FLOW=37, PETRI_DIFFERENCE_MINUEND_PLACES=18, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=11, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=10, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=39, PETRI_PLACES=20, PETRI_TRANSITIONS=11} [2021-03-11 04:26:03,232 INFO L335 CegarLoopForPetriNet]: 19 programPoint places, 1 predicate places. [2021-03-11 04:26:03,232 INFO L480 AbstractCegarLoop]: Abstraction has has 20 places, 11 transitions, 39 flow [2021-03-11 04:26:03,232 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 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) [2021-03-11 04:26:03,232 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,232 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2021-03-11 04:26:03,232 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-11 04:26:03,232 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,233 INFO L82 PathProgramCache]: Analyzing trace with hash 63416129, now seen corresponding path program 1 times [2021-03-11 04:26:03,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,233 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454075698] [2021-03-11 04:26:03,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,237 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,240 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,241 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:03,241 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:03,242 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-03-11 04:26:03,242 WARN L342 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:03,242 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-03-11 04:26:03,276 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:03,277 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:03,278 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:03,278 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:03,278 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:03,278 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:03,278 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:03,278 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:03,278 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:03,278 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:03,279 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 26 places, 17 transitions, 66 flow [2021-03-11 04:26:03,284 INFO L129 PetriNetUnfolder]: 0/29 cut-off events. [2021-03-11 04:26:03,285 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,285 INFO L84 FinitePrefix]: Finished finitePrefix Result has 52 conditions, 29 events. 0/29 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 90 event pairs, 0 based on Foata normal form. 0/24 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-11 04:26:03,285 INFO L82 GeneralOperation]: Start removeDead. Operand has 26 places, 17 transitions, 66 flow [2021-03-11 04:26:03,285 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 24 places, 15 transitions, 62 flow [2021-03-11 04:26:03,286 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-11 04:26:03,286 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,287 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,287 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:03,287 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,287 INFO L82 PathProgramCache]: Analyzing trace with hash 2659, now seen corresponding path program 1 times [2021-03-11 04:26:03,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,288 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376712696] [2021-03-11 04:26:03,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:03,308 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:03,310 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:03,319 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:03,320 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376712696] [2021-03-11 04:26:03,320 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:03,320 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:03,320 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622636509] [2021-03-11 04:26:03,320 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:03,321 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:03,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:03,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:03,324 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 17 [2021-03-11 04:26:03,325 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 15 transitions, 62 flow. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 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) [2021-03-11 04:26:03,325 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:03,325 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 17 [2021-03-11 04:26:03,325 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:03,382 INFO L129 PetriNetUnfolder]: 17/53 cut-off events. [2021-03-11 04:26:03,382 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,388 INFO L84 FinitePrefix]: Finished finitePrefix Result has 110 conditions, 53 events. 17/53 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 197 event pairs, 17 based on Foata normal form. 20/67 useless extension candidates. Maximal degree in co-relation 79. Up to 33 conditions per place. [2021-03-11 04:26:03,391 INFO L132 encePairwiseOnDemand]: 15/17 looper letters, 4 selfloop transitions, 1 changer transitions 0/14 dead transitions. [2021-03-11 04:26:03,391 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 14 transitions, 70 flow [2021-03-11 04:26:03,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:03,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:03,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 36 transitions. [2021-03-11 04:26:03,393 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7058823529411765 [2021-03-11 04:26:03,393 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 36 transitions. [2021-03-11 04:26:03,393 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 36 transitions. [2021-03-11 04:26:03,393 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:03,393 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 36 transitions. [2021-03-11 04:26:03,396 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 12.0) internal successors, (36), 3 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) [2021-03-11 04:26:03,398 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 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) [2021-03-11 04:26:03,399 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 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) [2021-03-11 04:26:03,399 INFO L185 Difference]: Start difference. First operand has 24 places, 15 transitions, 62 flow. Second operand 3 states and 36 transitions. [2021-03-11 04:26:03,399 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 14 transitions, 70 flow [2021-03-11 04:26:03,401 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 25 places, 14 transitions, 58 flow, removed 6 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:03,404 INFO L241 Difference]: Finished difference. Result has 25 places, 14 transitions, 50 flow [2021-03-11 04:26:03,404 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=17, PETRI_DIFFERENCE_MINUEND_FLOW=48, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=14, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=50, PETRI_PLACES=25, PETRI_TRANSITIONS=14} [2021-03-11 04:26:03,404 INFO L335 CegarLoopForPetriNet]: 24 programPoint places, 1 predicate places. [2021-03-11 04:26:03,404 INFO L480 AbstractCegarLoop]: Abstraction has has 25 places, 14 transitions, 50 flow [2021-03-11 04:26:03,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 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) [2021-03-11 04:26:03,405 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,405 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2021-03-11 04:26:03,405 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-03-11 04:26:03,405 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1824239762, now seen corresponding path program 1 times [2021-03-11 04:26:03,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,406 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466080968] [2021-03-11 04:26:03,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,427 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,436 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,442 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:03,442 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:03,442 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-03-11 04:26:03,443 WARN L342 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:03,444 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2021-03-11 04:26:03,463 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:03,464 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:03,466 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:03,466 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:03,467 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:03,468 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:03,468 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:03,468 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:03,468 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:03,468 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:03,472 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 20 transitions, 85 flow [2021-03-11 04:26:03,496 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-03-11 04:26:03,496 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,497 INFO L84 FinitePrefix]: Finished finitePrefix Result has 66 conditions, 35 events. 0/35 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 111 event pairs, 0 based on Foata normal form. 0/29 useless extension candidates. Maximal degree in co-relation 0. Up to 6 conditions per place. [2021-03-11 04:26:03,497 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 20 transitions, 85 flow [2021-03-11 04:26:03,498 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 18 transitions, 81 flow [2021-03-11 04:26:03,500 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-11 04:26:03,500 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,500 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,501 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:03,501 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,501 INFO L82 PathProgramCache]: Analyzing trace with hash 3299, now seen corresponding path program 1 times [2021-03-11 04:26:03,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,502 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246280917] [2021-03-11 04:26:03,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:03,520 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:03,521 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:03,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:03,527 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246280917] [2021-03-11 04:26:03,527 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:03,528 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:03,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255620894] [2021-03-11 04:26:03,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:03,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:03,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:03,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:03,530 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 20 [2021-03-11 04:26:03,531 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 18 transitions, 81 flow. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 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) [2021-03-11 04:26:03,531 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:03,531 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 20 [2021-03-11 04:26:03,532 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:03,600 INFO L129 PetriNetUnfolder]: 49/118 cut-off events. [2021-03-11 04:26:03,600 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,605 INFO L84 FinitePrefix]: Finished finitePrefix Result has 231 conditions, 118 events. 49/118 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 527 event pairs, 49 based on Foata normal form. 37/142 useless extension candidates. Maximal degree in co-relation 191. Up to 81 conditions per place. [2021-03-11 04:26:03,607 INFO L132 encePairwiseOnDemand]: 18/20 looper letters, 5 selfloop transitions, 1 changer transitions 0/17 dead transitions. [2021-03-11 04:26:03,607 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 30 places, 17 transitions, 91 flow [2021-03-11 04:26:03,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:03,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:03,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 43 transitions. [2021-03-11 04:26:03,613 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7166666666666667 [2021-03-11 04:26:03,613 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 43 transitions. [2021-03-11 04:26:03,613 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 43 transitions. [2021-03-11 04:26:03,614 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:03,614 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 43 transitions. [2021-03-11 04:26:03,614 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 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) [2021-03-11 04:26:03,615 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 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) [2021-03-11 04:26:03,615 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 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) [2021-03-11 04:26:03,615 INFO L185 Difference]: Start difference. First operand has 29 places, 18 transitions, 81 flow. Second operand 3 states and 43 transitions. [2021-03-11 04:26:03,615 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 30 places, 17 transitions, 91 flow [2021-03-11 04:26:03,616 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 17 transitions, 71 flow, removed 10 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:03,617 INFO L241 Difference]: Finished difference. Result has 30 places, 17 transitions, 61 flow [2021-03-11 04:26:03,617 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=20, PETRI_DIFFERENCE_MINUEND_FLOW=59, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=17, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=16, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=61, PETRI_PLACES=30, PETRI_TRANSITIONS=17} [2021-03-11 04:26:03,618 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 1 predicate places. [2021-03-11 04:26:03,618 INFO L480 AbstractCegarLoop]: Abstraction has has 30 places, 17 transitions, 61 flow [2021-03-11 04:26:03,618 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 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) [2021-03-11 04:26:03,618 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,618 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:26:03,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-03-11 04:26:03,619 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,619 INFO L82 PathProgramCache]: Analyzing trace with hash 504182917, now seen corresponding path program 1 times [2021-03-11 04:26:03,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,619 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [399658461] [2021-03-11 04:26:03,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,623 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,626 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,628 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:03,628 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:03,629 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-03-11 04:26:03,629 WARN L342 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:03,629 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2021-03-11 04:26:03,639 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:03,640 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:03,640 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:03,641 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:03,641 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:03,641 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:03,641 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:03,641 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:03,641 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:03,641 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:03,642 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 36 places, 23 transitions, 106 flow [2021-03-11 04:26:03,645 INFO L129 PetriNetUnfolder]: 0/41 cut-off events. [2021-03-11 04:26:03,645 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,645 INFO L84 FinitePrefix]: Finished finitePrefix Result has 81 conditions, 41 events. 0/41 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 136 event pairs, 0 based on Foata normal form. 0/34 useless extension candidates. Maximal degree in co-relation 0. Up to 7 conditions per place. [2021-03-11 04:26:03,646 INFO L82 GeneralOperation]: Start removeDead. Operand has 36 places, 23 transitions, 106 flow [2021-03-11 04:26:03,646 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 34 places, 21 transitions, 102 flow [2021-03-11 04:26:03,647 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-11 04:26:03,647 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,647 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,647 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:03,647 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,648 INFO L82 PathProgramCache]: Analyzing trace with hash 4035, now seen corresponding path program 1 times [2021-03-11 04:26:03,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,648 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109633289] [2021-03-11 04:26:03,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:03,654 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:03,655 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:03,658 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:03,659 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109633289] [2021-03-11 04:26:03,659 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:03,659 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:03,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794050462] [2021-03-11 04:26:03,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:03,659 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:03,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:03,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:03,660 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 23 [2021-03-11 04:26:03,661 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 34 places, 21 transitions, 102 flow. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 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) [2021-03-11 04:26:03,661 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:03,661 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 23 [2021-03-11 04:26:03,661 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:03,702 INFO L129 PetriNetUnfolder]: 129/263 cut-off events. [2021-03-11 04:26:03,702 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,704 INFO L84 FinitePrefix]: Finished finitePrefix Result has 497 conditions, 263 events. 129/263 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 40. Compared 1333 event pairs, 129 based on Foata normal form. 70/309 useless extension candidates. Maximal degree in co-relation 447. Up to 193 conditions per place. [2021-03-11 04:26:03,706 INFO L132 encePairwiseOnDemand]: 21/23 looper letters, 6 selfloop transitions, 1 changer transitions 0/20 dead transitions. [2021-03-11 04:26:03,706 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 35 places, 20 transitions, 114 flow [2021-03-11 04:26:03,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:03,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:03,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 50 transitions. [2021-03-11 04:26:03,713 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7246376811594203 [2021-03-11 04:26:03,714 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 50 transitions. [2021-03-11 04:26:03,714 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 50 transitions. [2021-03-11 04:26:03,714 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:03,714 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 50 transitions. [2021-03-11 04:26:03,716 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 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) [2021-03-11 04:26:03,718 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 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) [2021-03-11 04:26:03,718 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 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) [2021-03-11 04:26:03,718 INFO L185 Difference]: Start difference. First operand has 34 places, 21 transitions, 102 flow. Second operand 3 states and 50 transitions. [2021-03-11 04:26:03,719 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 35 places, 20 transitions, 114 flow [2021-03-11 04:26:03,721 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 35 places, 20 transitions, 84 flow, removed 15 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:03,722 INFO L241 Difference]: Finished difference. Result has 35 places, 20 transitions, 72 flow [2021-03-11 04:26:03,722 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=23, PETRI_DIFFERENCE_MINUEND_FLOW=70, PETRI_DIFFERENCE_MINUEND_PLACES=33, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=72, PETRI_PLACES=35, PETRI_TRANSITIONS=20} [2021-03-11 04:26:03,722 INFO L335 CegarLoopForPetriNet]: 34 programPoint places, 1 predicate places. [2021-03-11 04:26:03,723 INFO L480 AbstractCegarLoop]: Abstraction has has 35 places, 20 transitions, 72 flow [2021-03-11 04:26:03,723 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 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) [2021-03-11 04:26:03,723 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,723 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:26:03,723 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-03-11 04:26:03,723 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,724 INFO L82 PathProgramCache]: Analyzing trace with hash 1332075505, now seen corresponding path program 1 times [2021-03-11 04:26:03,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,724 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272104375] [2021-03-11 04:26:03,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,728 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,731 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,733 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:03,733 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:03,733 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-03-11 04:26:03,734 WARN L342 ceAbstractionStarter]: 6 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:03,734 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 7 thread instances. [2021-03-11 04:26:03,746 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:03,746 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:03,747 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:03,747 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:03,747 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:03,747 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:03,747 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:03,748 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:03,748 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:03,748 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:03,749 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 41 places, 26 transitions, 129 flow [2021-03-11 04:26:03,752 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-03-11 04:26:03,753 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,753 INFO L84 FinitePrefix]: Finished finitePrefix Result has 97 conditions, 47 events. 0/47 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 166 event pairs, 0 based on Foata normal form. 0/39 useless extension candidates. Maximal degree in co-relation 0. Up to 8 conditions per place. [2021-03-11 04:26:03,753 INFO L82 GeneralOperation]: Start removeDead. Operand has 41 places, 26 transitions, 129 flow [2021-03-11 04:26:03,753 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 39 places, 24 transitions, 125 flow [2021-03-11 04:26:03,754 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-11 04:26:03,754 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,754 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,754 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:03,754 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,755 INFO L82 PathProgramCache]: Analyzing trace with hash 4867, now seen corresponding path program 1 times [2021-03-11 04:26:03,755 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,755 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795334183] [2021-03-11 04:26:03,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:03,761 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:03,762 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:03,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:03,765 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795334183] [2021-03-11 04:26:03,765 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:03,765 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:03,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486915709] [2021-03-11 04:26:03,766 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:03,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:03,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:03,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:03,767 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-03-11 04:26:03,767 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 39 places, 24 transitions, 125 flow. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 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) [2021-03-11 04:26:03,767 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:03,768 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-03-11 04:26:03,768 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:03,850 INFO L129 PetriNetUnfolder]: 321/584 cut-off events. [2021-03-11 04:26:03,850 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,855 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1084 conditions, 584 events. 321/584 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 78. Compared 3279 event pairs, 321 based on Foata normal form. 135/676 useless extension candidates. Maximal degree in co-relation 1023. Up to 449 conditions per place. [2021-03-11 04:26:03,860 INFO L132 encePairwiseOnDemand]: 24/26 looper letters, 7 selfloop transitions, 1 changer transitions 0/23 dead transitions. [2021-03-11 04:26:03,860 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 23 transitions, 139 flow [2021-03-11 04:26:03,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:03,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:03,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 57 transitions. [2021-03-11 04:26:03,864 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7307692307692307 [2021-03-11 04:26:03,864 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 57 transitions. [2021-03-11 04:26:03,864 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 57 transitions. [2021-03-11 04:26:03,864 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:03,864 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 57 transitions. [2021-03-11 04:26:03,866 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 19.0) internal successors, (57), 3 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) [2021-03-11 04:26:03,866 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 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) [2021-03-11 04:26:03,866 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 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) [2021-03-11 04:26:03,867 INFO L185 Difference]: Start difference. First operand has 39 places, 24 transitions, 125 flow. Second operand 3 states and 57 transitions. [2021-03-11 04:26:03,867 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 23 transitions, 139 flow [2021-03-11 04:26:03,871 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 40 places, 23 transitions, 97 flow, removed 21 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:03,872 INFO L241 Difference]: Finished difference. Result has 40 places, 23 transitions, 83 flow [2021-03-11 04:26:03,873 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=81, PETRI_DIFFERENCE_MINUEND_PLACES=38, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=23, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=83, PETRI_PLACES=40, PETRI_TRANSITIONS=23} [2021-03-11 04:26:03,873 INFO L335 CegarLoopForPetriNet]: 39 programPoint places, 1 predicate places. [2021-03-11 04:26:03,873 INFO L480 AbstractCegarLoop]: Abstraction has has 40 places, 23 transitions, 83 flow [2021-03-11 04:26:03,873 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 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) [2021-03-11 04:26:03,873 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,873 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:26:03,873 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-03-11 04:26:03,874 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,874 INFO L82 PathProgramCache]: Analyzing trace with hash 58177429, now seen corresponding path program 1 times [2021-03-11 04:26:03,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,878 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148331993] [2021-03-11 04:26:03,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,892 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:03,895 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:03,900 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:03,900 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:03,900 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-03-11 04:26:03,900 WARN L342 ceAbstractionStarter]: 7 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:03,901 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 8 thread instances. [2021-03-11 04:26:03,914 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:03,915 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:03,916 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:03,916 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:03,916 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:03,916 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:03,916 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:03,916 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:03,916 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:03,916 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:03,917 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 46 places, 29 transitions, 154 flow [2021-03-11 04:26:03,922 INFO L129 PetriNetUnfolder]: 0/53 cut-off events. [2021-03-11 04:26:03,923 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,923 INFO L84 FinitePrefix]: Finished finitePrefix Result has 114 conditions, 53 events. 0/53 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 191 event pairs, 0 based on Foata normal form. 0/44 useless extension candidates. Maximal degree in co-relation 0. Up to 9 conditions per place. [2021-03-11 04:26:03,923 INFO L82 GeneralOperation]: Start removeDead. Operand has 46 places, 29 transitions, 154 flow [2021-03-11 04:26:03,924 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 44 places, 27 transitions, 150 flow [2021-03-11 04:26:03,924 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-11 04:26:03,924 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:03,925 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:03,925 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:03,925 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:03,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:03,925 INFO L82 PathProgramCache]: Analyzing trace with hash 5795, now seen corresponding path program 1 times [2021-03-11 04:26:03,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:03,926 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147233402] [2021-03-11 04:26:03,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:03,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:03,932 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:03,932 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:03,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:03,936 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147233402] [2021-03-11 04:26:03,936 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:03,936 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:03,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353099430] [2021-03-11 04:26:03,937 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:03,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:03,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:03,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:03,938 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 29 [2021-03-11 04:26:03,938 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 27 transitions, 150 flow. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 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) [2021-03-11 04:26:03,938 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:03,938 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 29 [2021-03-11 04:26:03,938 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:04,113 INFO L129 PetriNetUnfolder]: 769/1289 cut-off events. [2021-03-11 04:26:04,113 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:04,120 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2376 conditions, 1289 events. 769/1289 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 154. Compared 7751 event pairs, 769 based on Foata normal form. 264/1478 useless extension candidates. Maximal degree in co-relation 2303. Up to 1025 conditions per place. [2021-03-11 04:26:04,130 INFO L132 encePairwiseOnDemand]: 27/29 looper letters, 8 selfloop transitions, 1 changer transitions 0/26 dead transitions. [2021-03-11 04:26:04,130 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 26 transitions, 166 flow [2021-03-11 04:26:04,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:04,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:04,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 64 transitions. [2021-03-11 04:26:04,135 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.735632183908046 [2021-03-11 04:26:04,135 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 64 transitions. [2021-03-11 04:26:04,135 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 64 transitions. [2021-03-11 04:26:04,135 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:04,135 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 64 transitions. [2021-03-11 04:26:04,136 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 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) [2021-03-11 04:26:04,137 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 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) [2021-03-11 04:26:04,137 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 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) [2021-03-11 04:26:04,137 INFO L185 Difference]: Start difference. First operand has 44 places, 27 transitions, 150 flow. Second operand 3 states and 64 transitions. [2021-03-11 04:26:04,137 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 26 transitions, 166 flow [2021-03-11 04:26:04,139 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 26 transitions, 110 flow, removed 28 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:04,140 INFO L241 Difference]: Finished difference. Result has 45 places, 26 transitions, 94 flow [2021-03-11 04:26:04,140 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=29, PETRI_DIFFERENCE_MINUEND_FLOW=92, PETRI_DIFFERENCE_MINUEND_PLACES=43, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=94, PETRI_PLACES=45, PETRI_TRANSITIONS=26} [2021-03-11 04:26:04,140 INFO L335 CegarLoopForPetriNet]: 44 programPoint places, 1 predicate places. [2021-03-11 04:26:04,140 INFO L480 AbstractCegarLoop]: Abstraction has has 45 places, 26 transitions, 94 flow [2021-03-11 04:26:04,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 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) [2021-03-11 04:26:04,141 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:04,141 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:26:04,141 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-03-11 04:26:04,141 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:04,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:04,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1055505844, now seen corresponding path program 1 times [2021-03-11 04:26:04,142 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:04,142 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321183120] [2021-03-11 04:26:04,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:04,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:04,147 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:04,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:04,151 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:04,153 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:04,153 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:04,153 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-03-11 04:26:04,154 WARN L342 ceAbstractionStarter]: 8 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:04,154 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 9 thread instances. [2021-03-11 04:26:04,168 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:04,169 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:04,170 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:04,170 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:04,170 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:04,170 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:04,170 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:04,170 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:04,170 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:04,170 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:04,171 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 51 places, 32 transitions, 181 flow [2021-03-11 04:26:04,177 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-03-11 04:26:04,177 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:04,177 INFO L84 FinitePrefix]: Finished finitePrefix Result has 132 conditions, 59 events. 0/59 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 216 event pairs, 0 based on Foata normal form. 0/49 useless extension candidates. Maximal degree in co-relation 0. Up to 10 conditions per place. [2021-03-11 04:26:04,177 INFO L82 GeneralOperation]: Start removeDead. Operand has 51 places, 32 transitions, 181 flow [2021-03-11 04:26:04,178 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 49 places, 30 transitions, 177 flow [2021-03-11 04:26:04,179 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-11 04:26:04,179 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:04,179 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:04,179 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:04,179 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:04,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:04,180 INFO L82 PathProgramCache]: Analyzing trace with hash 6819, now seen corresponding path program 1 times [2021-03-11 04:26:04,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:04,180 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852463208] [2021-03-11 04:26:04,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:04,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:04,186 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:04,187 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:04,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:04,190 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852463208] [2021-03-11 04:26:04,191 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:04,191 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:04,191 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337807293] [2021-03-11 04:26:04,191 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:04,191 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:04,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:04,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:04,192 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 32 [2021-03-11 04:26:04,193 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 30 transitions, 177 flow. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 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) [2021-03-11 04:26:04,193 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:04,193 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 32 [2021-03-11 04:26:04,193 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:04,495 INFO L129 PetriNetUnfolder]: 1793/2826 cut-off events. [2021-03-11 04:26:04,496 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:04,509 INFO L84 FinitePrefix]: Finished finitePrefix Result has 5205 conditions, 2826 events. 1793/2826 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 300. Compared 17761 event pairs, 1793 based on Foata normal form. 521/3216 useless extension candidates. Maximal degree in co-relation 5119. Up to 2305 conditions per place. [2021-03-11 04:26:04,527 INFO L132 encePairwiseOnDemand]: 30/32 looper letters, 9 selfloop transitions, 1 changer transitions 0/29 dead transitions. [2021-03-11 04:26:04,528 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 50 places, 29 transitions, 195 flow [2021-03-11 04:26:04,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:04,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:04,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 71 transitions. [2021-03-11 04:26:04,530 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7395833333333334 [2021-03-11 04:26:04,530 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 71 transitions. [2021-03-11 04:26:04,530 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 71 transitions. [2021-03-11 04:26:04,531 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:04,531 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 71 transitions. [2021-03-11 04:26:04,531 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 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) [2021-03-11 04:26:04,533 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 32.0) internal successors, (128), 4 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) [2021-03-11 04:26:04,533 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 32.0) internal successors, (128), 4 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) [2021-03-11 04:26:04,533 INFO L185 Difference]: Start difference. First operand has 49 places, 30 transitions, 177 flow. Second operand 3 states and 71 transitions. [2021-03-11 04:26:04,534 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 50 places, 29 transitions, 195 flow [2021-03-11 04:26:04,537 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 50 places, 29 transitions, 123 flow, removed 36 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:04,538 INFO L241 Difference]: Finished difference. Result has 50 places, 29 transitions, 105 flow [2021-03-11 04:26:04,538 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=32, PETRI_DIFFERENCE_MINUEND_FLOW=103, PETRI_DIFFERENCE_MINUEND_PLACES=48, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=28, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=105, PETRI_PLACES=50, PETRI_TRANSITIONS=29} [2021-03-11 04:26:04,539 INFO L335 CegarLoopForPetriNet]: 49 programPoint places, 1 predicate places. [2021-03-11 04:26:04,539 INFO L480 AbstractCegarLoop]: Abstraction has has 50 places, 29 transitions, 105 flow [2021-03-11 04:26:04,539 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 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) [2021-03-11 04:26:04,539 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:04,539 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:26:04,539 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-03-11 04:26:04,539 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:04,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:04,540 INFO L82 PathProgramCache]: Analyzing trace with hash 1814808561, now seen corresponding path program 1 times [2021-03-11 04:26:04,540 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:04,540 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564569477] [2021-03-11 04:26:04,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:04,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:04,555 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:04,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:04,565 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:04,567 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:04,567 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:04,567 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-03-11 04:26:04,568 WARN L342 ceAbstractionStarter]: 9 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:04,568 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 10 thread instances. [2021-03-11 04:26:04,596 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:04,596 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:04,598 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:04,598 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:04,598 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:04,598 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:04,598 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:04,598 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:04,598 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:04,598 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:04,601 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 56 places, 35 transitions, 210 flow [2021-03-11 04:26:04,607 INFO L129 PetriNetUnfolder]: 0/65 cut-off events. [2021-03-11 04:26:04,607 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:04,607 INFO L84 FinitePrefix]: Finished finitePrefix Result has 151 conditions, 65 events. 0/65 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 234 event pairs, 0 based on Foata normal form. 0/54 useless extension candidates. Maximal degree in co-relation 0. Up to 11 conditions per place. [2021-03-11 04:26:04,607 INFO L82 GeneralOperation]: Start removeDead. Operand has 56 places, 35 transitions, 210 flow [2021-03-11 04:26:04,608 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 54 places, 33 transitions, 206 flow [2021-03-11 04:26:04,609 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-11 04:26:04,609 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:04,610 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:04,610 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:04,610 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:04,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:04,610 INFO L82 PathProgramCache]: Analyzing trace with hash 7939, now seen corresponding path program 1 times [2021-03-11 04:26:04,610 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:04,611 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301995227] [2021-03-11 04:26:04,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:04,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:04,620 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:04,621 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:04,625 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:04,625 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301995227] [2021-03-11 04:26:04,625 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:04,625 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:04,625 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419374450] [2021-03-11 04:26:04,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:04,625 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:04,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:04,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:04,626 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 22 out of 35 [2021-03-11 04:26:04,626 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 33 transitions, 206 flow. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 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) [2021-03-11 04:26:04,626 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:04,626 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 22 of 35 [2021-03-11 04:26:04,627 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:05,231 INFO L129 PetriNetUnfolder]: 4097/6155 cut-off events. [2021-03-11 04:26:05,232 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:05,275 INFO L84 FinitePrefix]: Finished finitePrefix Result has 11363 conditions, 6155 events. 4097/6155 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 592. Compared 39939 event pairs, 4097 based on Foata normal form. 1034/6972 useless extension candidates. Maximal degree in co-relation 11263. Up to 5121 conditions per place. [2021-03-11 04:26:05,316 INFO L132 encePairwiseOnDemand]: 33/35 looper letters, 10 selfloop transitions, 1 changer transitions 0/32 dead transitions. [2021-03-11 04:26:05,316 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 32 transitions, 226 flow [2021-03-11 04:26:05,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:05,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:05,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 78 transitions. [2021-03-11 04:26:05,317 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7428571428571429 [2021-03-11 04:26:05,317 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 78 transitions. [2021-03-11 04:26:05,317 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 78 transitions. [2021-03-11 04:26:05,317 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:05,317 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 78 transitions. [2021-03-11 04:26:05,318 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 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) [2021-03-11 04:26:05,318 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 35.0) internal successors, (140), 4 states have internal predecessors, (140), 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) [2021-03-11 04:26:05,318 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 35.0) internal successors, (140), 4 states have internal predecessors, (140), 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) [2021-03-11 04:26:05,318 INFO L185 Difference]: Start difference. First operand has 54 places, 33 transitions, 206 flow. Second operand 3 states and 78 transitions. [2021-03-11 04:26:05,318 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 32 transitions, 226 flow [2021-03-11 04:26:05,320 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 55 places, 32 transitions, 136 flow, removed 45 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:05,321 INFO L241 Difference]: Finished difference. Result has 55 places, 32 transitions, 116 flow [2021-03-11 04:26:05,321 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=35, PETRI_DIFFERENCE_MINUEND_FLOW=114, PETRI_DIFFERENCE_MINUEND_PLACES=53, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=32, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=116, PETRI_PLACES=55, PETRI_TRANSITIONS=32} [2021-03-11 04:26:05,322 INFO L335 CegarLoopForPetriNet]: 54 programPoint places, 1 predicate places. [2021-03-11 04:26:05,322 INFO L480 AbstractCegarLoop]: Abstraction has has 55 places, 32 transitions, 116 flow [2021-03-11 04:26:05,322 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 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) [2021-03-11 04:26:05,322 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:05,322 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:26:05,322 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-03-11 04:26:05,322 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:05,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:05,323 INFO L82 PathProgramCache]: Analyzing trace with hash 1379283255, now seen corresponding path program 1 times [2021-03-11 04:26:05,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:05,323 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639261766] [2021-03-11 04:26:05,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:05,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:05,332 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:05,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:05,338 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:05,344 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:05,344 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:05,345 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-03-11 04:26:05,345 WARN L342 ceAbstractionStarter]: 10 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:05,345 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 11 thread instances. [2021-03-11 04:26:05,371 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:05,372 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:05,373 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:05,373 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:05,373 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:05,373 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:05,373 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:05,373 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:05,373 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:05,373 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:05,376 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 61 places, 38 transitions, 241 flow [2021-03-11 04:26:05,380 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-03-11 04:26:05,380 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:05,380 INFO L84 FinitePrefix]: Finished finitePrefix Result has 171 conditions, 71 events. 0/71 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 257 event pairs, 0 based on Foata normal form. 0/59 useless extension candidates. Maximal degree in co-relation 0. Up to 12 conditions per place. [2021-03-11 04:26:05,380 INFO L82 GeneralOperation]: Start removeDead. Operand has 61 places, 38 transitions, 241 flow [2021-03-11 04:26:05,381 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 59 places, 36 transitions, 237 flow [2021-03-11 04:26:05,381 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-11 04:26:05,381 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:05,381 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:05,381 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:05,381 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:05,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:05,382 INFO L82 PathProgramCache]: Analyzing trace with hash 9155, now seen corresponding path program 1 times [2021-03-11 04:26:05,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:05,382 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059384291] [2021-03-11 04:26:05,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:05,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:05,396 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:05,397 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:05,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:05,401 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059384291] [2021-03-11 04:26:05,402 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:05,402 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:05,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332602288] [2021-03-11 04:26:05,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:05,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:05,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:05,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:05,405 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 24 out of 38 [2021-03-11 04:26:05,406 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 36 transitions, 237 flow. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 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) [2021-03-11 04:26:05,406 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:05,406 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 24 of 38 [2021-03-11 04:26:05,406 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:06,936 INFO L129 PetriNetUnfolder]: 9217/13324 cut-off events. [2021-03-11 04:26:06,937 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:07,097 INFO L84 FinitePrefix]: Finished finitePrefix Result has 24690 conditions, 13324 events. 9217/13324 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 1159. Compared 89630 event pairs, 9217 based on Foata normal form. 2059/15024 useless extension candidates. Maximal degree in co-relation 24575. Up to 11265 conditions per place. [2021-03-11 04:26:07,177 INFO L132 encePairwiseOnDemand]: 36/38 looper letters, 11 selfloop transitions, 1 changer transitions 0/35 dead transitions. [2021-03-11 04:26:07,177 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 35 transitions, 259 flow [2021-03-11 04:26:07,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:07,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:07,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 85 transitions. [2021-03-11 04:26:07,178 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7456140350877193 [2021-03-11 04:26:07,178 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 85 transitions. [2021-03-11 04:26:07,179 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 85 transitions. [2021-03-11 04:26:07,179 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:07,179 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 85 transitions. [2021-03-11 04:26:07,179 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 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) [2021-03-11 04:26:07,180 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 38.0) internal successors, (152), 4 states have internal predecessors, (152), 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) [2021-03-11 04:26:07,180 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 38.0) internal successors, (152), 4 states have internal predecessors, (152), 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) [2021-03-11 04:26:07,180 INFO L185 Difference]: Start difference. First operand has 59 places, 36 transitions, 237 flow. Second operand 3 states and 85 transitions. [2021-03-11 04:26:07,180 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 35 transitions, 259 flow [2021-03-11 04:26:07,181 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 60 places, 35 transitions, 149 flow, removed 55 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:07,182 INFO L241 Difference]: Finished difference. Result has 60 places, 35 transitions, 127 flow [2021-03-11 04:26:07,183 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=38, PETRI_DIFFERENCE_MINUEND_FLOW=125, PETRI_DIFFERENCE_MINUEND_PLACES=58, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=35, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=127, PETRI_PLACES=60, PETRI_TRANSITIONS=35} [2021-03-11 04:26:07,183 INFO L335 CegarLoopForPetriNet]: 59 programPoint places, 1 predicate places. [2021-03-11 04:26:07,183 INFO L480 AbstractCegarLoop]: Abstraction has has 60 places, 35 transitions, 127 flow [2021-03-11 04:26:07,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 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) [2021-03-11 04:26:07,183 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:07,183 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:26:07,183 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-03-11 04:26:07,184 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:07,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:07,184 INFO L82 PathProgramCache]: Analyzing trace with hash -279163623, now seen corresponding path program 1 times [2021-03-11 04:26:07,184 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:07,184 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524554068] [2021-03-11 04:26:07,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:07,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:07,188 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:07,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:07,191 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:07,193 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:07,193 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:07,194 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-03-11 04:26:07,194 WARN L342 ceAbstractionStarter]: 11 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:07,194 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 12 thread instances. [2021-03-11 04:26:07,208 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:07,209 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:07,209 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:07,209 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:07,209 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:07,210 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:07,210 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:07,210 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:07,210 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:07,210 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:07,210 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 66 places, 41 transitions, 274 flow [2021-03-11 04:26:07,215 INFO L129 PetriNetUnfolder]: 0/77 cut-off events. [2021-03-11 04:26:07,216 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:07,216 INFO L84 FinitePrefix]: Finished finitePrefix Result has 192 conditions, 77 events. 0/77 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 280 event pairs, 0 based on Foata normal form. 0/64 useless extension candidates. Maximal degree in co-relation 0. Up to 13 conditions per place. [2021-03-11 04:26:07,216 INFO L82 GeneralOperation]: Start removeDead. Operand has 66 places, 41 transitions, 274 flow [2021-03-11 04:26:07,217 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 64 places, 39 transitions, 270 flow [2021-03-11 04:26:07,217 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-11 04:26:07,217 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:07,217 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:07,218 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:07,218 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:07,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:07,218 INFO L82 PathProgramCache]: Analyzing trace with hash 10467, now seen corresponding path program 1 times [2021-03-11 04:26:07,218 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:07,218 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922526350] [2021-03-11 04:26:07,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:07,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:07,224 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:07,224 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:07,226 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:07,227 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922526350] [2021-03-11 04:26:07,227 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:07,227 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:07,227 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268806329] [2021-03-11 04:26:07,227 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:07,227 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:07,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:07,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:07,228 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 26 out of 41 [2021-03-11 04:26:07,228 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 39 transitions, 270 flow. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 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) [2021-03-11 04:26:07,228 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:07,229 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 26 of 41 [2021-03-11 04:26:07,229 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:10,535 INFO L129 PetriNetUnfolder]: 20481/28685 cut-off events. [2021-03-11 04:26:10,535 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:10,853 INFO L84 FinitePrefix]: Finished finitePrefix Result has 53378 conditions, 28685 events. 20481/28685 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2277. Compared 197641 event pairs, 20481 based on Foata normal form. 4108/32201 useless extension candidates. Maximal degree in co-relation 53247. Up to 24577 conditions per place. [2021-03-11 04:26:10,999 INFO L132 encePairwiseOnDemand]: 39/41 looper letters, 12 selfloop transitions, 1 changer transitions 0/38 dead transitions. [2021-03-11 04:26:10,999 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 38 transitions, 294 flow [2021-03-11 04:26:11,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:11,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:11,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 92 transitions. [2021-03-11 04:26:11,000 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7479674796747967 [2021-03-11 04:26:11,000 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 92 transitions. [2021-03-11 04:26:11,000 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 92 transitions. [2021-03-11 04:26:11,001 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:11,001 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 92 transitions. [2021-03-11 04:26:11,001 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 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) [2021-03-11 04:26:11,001 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 41.0) internal successors, (164), 4 states have internal predecessors, (164), 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) [2021-03-11 04:26:11,002 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 41.0) internal successors, (164), 4 states have internal predecessors, (164), 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) [2021-03-11 04:26:11,002 INFO L185 Difference]: Start difference. First operand has 64 places, 39 transitions, 270 flow. Second operand 3 states and 92 transitions. [2021-03-11 04:26:11,002 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 38 transitions, 294 flow [2021-03-11 04:26:11,004 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 65 places, 38 transitions, 162 flow, removed 66 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:11,007 INFO L241 Difference]: Finished difference. Result has 65 places, 38 transitions, 138 flow [2021-03-11 04:26:11,008 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=41, PETRI_DIFFERENCE_MINUEND_FLOW=136, PETRI_DIFFERENCE_MINUEND_PLACES=63, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=38, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=37, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=138, PETRI_PLACES=65, PETRI_TRANSITIONS=38} [2021-03-11 04:26:11,008 INFO L335 CegarLoopForPetriNet]: 64 programPoint places, 1 predicate places. [2021-03-11 04:26:11,008 INFO L480 AbstractCegarLoop]: Abstraction has has 65 places, 38 transitions, 138 flow [2021-03-11 04:26:11,008 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 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) [2021-03-11 04:26:11,008 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:11,008 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:26:11,008 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-03-11 04:26:11,009 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:11,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:11,009 INFO L82 PathProgramCache]: Analyzing trace with hash 387658490, now seen corresponding path program 1 times [2021-03-11 04:26:11,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:11,009 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234629346] [2021-03-11 04:26:11,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:11,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:11,027 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:11,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:11,030 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:11,032 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:11,033 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:11,033 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-03-11 04:26:11,033 WARN L342 ceAbstractionStarter]: 12 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:11,033 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 13 thread instances. [2021-03-11 04:26:11,051 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:11,052 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:11,053 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:11,054 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:11,054 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:11,054 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:11,054 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:11,054 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:11,054 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:11,054 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:11,055 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 71 places, 44 transitions, 309 flow [2021-03-11 04:26:11,064 INFO L129 PetriNetUnfolder]: 0/83 cut-off events. [2021-03-11 04:26:11,065 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:11,065 INFO L84 FinitePrefix]: Finished finitePrefix Result has 214 conditions, 83 events. 0/83 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 309 event pairs, 0 based on Foata normal form. 0/69 useless extension candidates. Maximal degree in co-relation 0. Up to 14 conditions per place. [2021-03-11 04:26:11,065 INFO L82 GeneralOperation]: Start removeDead. Operand has 71 places, 44 transitions, 309 flow [2021-03-11 04:26:11,066 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 69 places, 42 transitions, 305 flow [2021-03-11 04:26:11,067 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-11 04:26:11,068 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:11,068 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:11,068 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:11,068 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:11,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:11,068 INFO L82 PathProgramCache]: Analyzing trace with hash 11875, now seen corresponding path program 1 times [2021-03-11 04:26:11,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:11,069 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771402394] [2021-03-11 04:26:11,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:11,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:11,077 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:11,078 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:11,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:11,081 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771402394] [2021-03-11 04:26:11,081 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:11,081 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:11,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774830010] [2021-03-11 04:26:11,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:11,082 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:11,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:11,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:11,083 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 28 out of 44 [2021-03-11 04:26:11,083 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 42 transitions, 305 flow. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 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) [2021-03-11 04:26:11,083 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:11,083 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 28 of 44 [2021-03-11 04:26:11,083 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:17,687 INFO L129 PetriNetUnfolder]: 45057/61454 cut-off events. [2021-03-11 04:26:17,687 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:18,475 INFO L84 FinitePrefix]: Finished finitePrefix Result has 114835 conditions, 61454 events. 45057/61454 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4476. Compared 431033 event pairs, 45057 based on Foata normal form. 8205/68691 useless extension candidates. Maximal degree in co-relation 114687. Up to 53249 conditions per place. [2021-03-11 04:26:18,765 INFO L132 encePairwiseOnDemand]: 42/44 looper letters, 13 selfloop transitions, 1 changer transitions 0/41 dead transitions. [2021-03-11 04:26:18,766 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 70 places, 41 transitions, 331 flow [2021-03-11 04:26:18,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:18,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:18,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 99 transitions. [2021-03-11 04:26:18,767 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.75 [2021-03-11 04:26:18,767 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 99 transitions. [2021-03-11 04:26:18,767 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 99 transitions. [2021-03-11 04:26:18,767 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:18,767 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 99 transitions. [2021-03-11 04:26:18,767 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 33.0) internal successors, (99), 3 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) [2021-03-11 04:26:18,767 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 44.0) internal successors, (176), 4 states have internal predecessors, (176), 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) [2021-03-11 04:26:18,768 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 44.0) internal successors, (176), 4 states have internal predecessors, (176), 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) [2021-03-11 04:26:18,768 INFO L185 Difference]: Start difference. First operand has 69 places, 42 transitions, 305 flow. Second operand 3 states and 99 transitions. [2021-03-11 04:26:18,768 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 70 places, 41 transitions, 331 flow [2021-03-11 04:26:18,769 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 70 places, 41 transitions, 175 flow, removed 78 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:18,770 INFO L241 Difference]: Finished difference. Result has 70 places, 41 transitions, 149 flow [2021-03-11 04:26:18,770 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=44, PETRI_DIFFERENCE_MINUEND_FLOW=147, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=40, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=149, PETRI_PLACES=70, PETRI_TRANSITIONS=41} [2021-03-11 04:26:18,770 INFO L335 CegarLoopForPetriNet]: 69 programPoint places, 1 predicate places. [2021-03-11 04:26:18,770 INFO L480 AbstractCegarLoop]: Abstraction has has 70 places, 41 transitions, 149 flow [2021-03-11 04:26:18,770 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 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) [2021-03-11 04:26:18,770 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:18,770 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:26:18,770 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-03-11 04:26:18,770 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:18,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:18,771 INFO L82 PathProgramCache]: Analyzing trace with hash -656774515, now seen corresponding path program 1 times [2021-03-11 04:26:18,771 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:18,771 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998021583] [2021-03-11 04:26:18,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:18,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:18,775 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:18,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:18,777 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:18,780 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:18,780 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:18,781 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-03-11 04:26:18,781 WARN L342 ceAbstractionStarter]: 13 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:18,781 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 14 thread instances. [2021-03-11 04:26:18,801 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:18,802 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:18,804 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:18,804 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:18,804 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:18,804 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:18,804 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:18,804 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:18,804 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:18,804 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:18,805 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 76 places, 47 transitions, 346 flow [2021-03-11 04:26:18,811 INFO L129 PetriNetUnfolder]: 0/89 cut-off events. [2021-03-11 04:26:18,812 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:18,812 INFO L84 FinitePrefix]: Finished finitePrefix Result has 237 conditions, 89 events. 0/89 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 343 event pairs, 0 based on Foata normal form. 0/74 useless extension candidates. Maximal degree in co-relation 0. Up to 15 conditions per place. [2021-03-11 04:26:18,812 INFO L82 GeneralOperation]: Start removeDead. Operand has 76 places, 47 transitions, 346 flow [2021-03-11 04:26:18,812 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 74 places, 45 transitions, 342 flow [2021-03-11 04:26:18,813 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-11 04:26:18,813 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:18,813 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:18,813 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:18,813 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:18,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:18,814 INFO L82 PathProgramCache]: Analyzing trace with hash 13379, now seen corresponding path program 1 times [2021-03-11 04:26:18,814 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:18,814 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344299098] [2021-03-11 04:26:18,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:18,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:18,821 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:18,821 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:18,824 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:18,824 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344299098] [2021-03-11 04:26:18,824 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:18,824 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:18,824 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596757724] [2021-03-11 04:26:18,825 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:18,825 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:18,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:18,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:18,826 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 30 out of 47 [2021-03-11 04:26:18,827 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 74 places, 45 transitions, 342 flow. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 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) [2021-03-11 04:26:18,827 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:18,827 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 30 of 47 [2021-03-11 04:26:18,827 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:26:36,181 INFO L129 PetriNetUnfolder]: 98305/131087 cut-off events. [2021-03-11 04:26:36,181 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:38,075 INFO L84 FinitePrefix]: Finished finitePrefix Result has 245925 conditions, 131087 events. 98305/131087 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8786. Compared 936954 event pairs, 98305 based on Foata normal form. 16398/145913 useless extension candidates. Maximal degree in co-relation 245759. Up to 114689 conditions per place. [2021-03-11 04:26:38,936 INFO L132 encePairwiseOnDemand]: 45/47 looper letters, 14 selfloop transitions, 1 changer transitions 0/44 dead transitions. [2021-03-11 04:26:38,936 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 75 places, 44 transitions, 370 flow [2021-03-11 04:26:38,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:26:38,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:26:38,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 106 transitions. [2021-03-11 04:26:38,937 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.75177304964539 [2021-03-11 04:26:38,937 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 106 transitions. [2021-03-11 04:26:38,937 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 106 transitions. [2021-03-11 04:26:38,937 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:26:38,937 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 106 transitions. [2021-03-11 04:26:38,938 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 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) [2021-03-11 04:26:38,938 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 47.0) internal successors, (188), 4 states have internal predecessors, (188), 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) [2021-03-11 04:26:38,938 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 47.0) internal successors, (188), 4 states have internal predecessors, (188), 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) [2021-03-11 04:26:38,938 INFO L185 Difference]: Start difference. First operand has 74 places, 45 transitions, 342 flow. Second operand 3 states and 106 transitions. [2021-03-11 04:26:38,938 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 75 places, 44 transitions, 370 flow [2021-03-11 04:26:38,941 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 75 places, 44 transitions, 188 flow, removed 91 selfloop flow, removed 0 redundant places. [2021-03-11 04:26:38,941 INFO L241 Difference]: Finished difference. Result has 75 places, 44 transitions, 160 flow [2021-03-11 04:26:38,942 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=47, PETRI_DIFFERENCE_MINUEND_FLOW=158, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=44, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=43, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=160, PETRI_PLACES=75, PETRI_TRANSITIONS=44} [2021-03-11 04:26:38,942 INFO L335 CegarLoopForPetriNet]: 74 programPoint places, 1 predicate places. [2021-03-11 04:26:38,942 INFO L480 AbstractCegarLoop]: Abstraction has has 75 places, 44 transitions, 160 flow [2021-03-11 04:26:38,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 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) [2021-03-11 04:26:38,942 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:38,942 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:26:38,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-03-11 04:26:38,943 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:38,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:38,944 INFO L82 PathProgramCache]: Analyzing trace with hash 910327677, now seen corresponding path program 1 times [2021-03-11 04:26:38,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:38,944 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608816113] [2021-03-11 04:26:38,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:38,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:38,948 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:38,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:26:38,951 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:26:38,953 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:26:38,954 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:26:38,954 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-03-11 04:26:38,954 WARN L342 ceAbstractionStarter]: 14 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:26:38,954 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 15 thread instances. [2021-03-11 04:26:38,972 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:26:38,972 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:26:38,973 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:26:38,973 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:26:38,973 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:26:38,973 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:26:38,973 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:26:38,973 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:26:38,973 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:26:38,973 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:26:38,974 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 81 places, 50 transitions, 385 flow [2021-03-11 04:26:38,979 INFO L129 PetriNetUnfolder]: 0/95 cut-off events. [2021-03-11 04:26:38,979 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:38,980 INFO L84 FinitePrefix]: Finished finitePrefix Result has 261 conditions, 95 events. 0/95 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 298 event pairs, 0 based on Foata normal form. 0/79 useless extension candidates. Maximal degree in co-relation 0. Up to 16 conditions per place. [2021-03-11 04:26:38,980 INFO L82 GeneralOperation]: Start removeDead. Operand has 81 places, 50 transitions, 385 flow [2021-03-11 04:26:38,980 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 79 places, 48 transitions, 381 flow [2021-03-11 04:26:38,981 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-11 04:26:38,981 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:26:38,981 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:26:38,981 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:26:38,981 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:26:38,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:26:38,982 INFO L82 PathProgramCache]: Analyzing trace with hash 14979, now seen corresponding path program 1 times [2021-03-11 04:26:38,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:26:38,982 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843205948] [2021-03-11 04:26:38,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:26:38,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:26:38,987 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:26:38,988 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:26:38,991 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:26:38,991 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843205948] [2021-03-11 04:26:38,991 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:26:38,991 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:26:38,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220995513] [2021-03-11 04:26:38,992 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:26:38,992 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:26:38,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:26:38,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:26:38,992 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 50 [2021-03-11 04:26:38,993 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 48 transitions, 381 flow. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 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) [2021-03-11 04:26:38,993 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:26:38,993 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 50 [2021-03-11 04:26:38,993 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:27:31,599 INFO L129 PetriNetUnfolder]: 212993/278544 cut-off events. [2021-03-11 04:27:31,600 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:27:35,397 INFO L84 FinitePrefix]: Finished finitePrefix Result has 524472 conditions, 278544 events. 212993/278544 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 17306. Compared 2008645 event pairs, 212993 based on Foata normal form. 32783/308766 useless extension candidates. Maximal degree in co-relation 524287. Up to 245761 conditions per place. [2021-03-11 04:27:36,799 INFO L132 encePairwiseOnDemand]: 48/50 looper letters, 15 selfloop transitions, 1 changer transitions 0/47 dead transitions. [2021-03-11 04:27:36,800 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 47 transitions, 411 flow [2021-03-11 04:27:36,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:27:36,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:27:36,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 113 transitions. [2021-03-11 04:27:36,804 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7533333333333333 [2021-03-11 04:27:36,804 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 113 transitions. [2021-03-11 04:27:36,804 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 113 transitions. [2021-03-11 04:27:36,804 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:27:36,804 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 113 transitions. [2021-03-11 04:27:36,804 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 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) [2021-03-11 04:27:36,811 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 50.0) internal successors, (200), 4 states have internal predecessors, (200), 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) [2021-03-11 04:27:36,811 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 50.0) internal successors, (200), 4 states have internal predecessors, (200), 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) [2021-03-11 04:27:36,811 INFO L185 Difference]: Start difference. First operand has 79 places, 48 transitions, 381 flow. Second operand 3 states and 113 transitions. [2021-03-11 04:27:36,811 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 80 places, 47 transitions, 411 flow [2021-03-11 04:27:36,813 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 80 places, 47 transitions, 201 flow, removed 105 selfloop flow, removed 0 redundant places. [2021-03-11 04:27:36,814 INFO L241 Difference]: Finished difference. Result has 80 places, 47 transitions, 171 flow [2021-03-11 04:27:36,814 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=50, PETRI_DIFFERENCE_MINUEND_FLOW=169, PETRI_DIFFERENCE_MINUEND_PLACES=78, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=47, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=46, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=171, PETRI_PLACES=80, PETRI_TRANSITIONS=47} [2021-03-11 04:27:36,814 INFO L335 CegarLoopForPetriNet]: 79 programPoint places, 1 predicate places. [2021-03-11 04:27:36,814 INFO L480 AbstractCegarLoop]: Abstraction has has 80 places, 47 transitions, 171 flow [2021-03-11 04:27:36,814 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 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) [2021-03-11 04:27:36,815 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:27:36,815 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:27:36,815 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-03-11 04:27:36,815 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:27:36,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:27:36,815 INFO L82 PathProgramCache]: Analyzing trace with hash 2024113101, now seen corresponding path program 1 times [2021-03-11 04:27:36,815 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:27:36,815 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42297891] [2021-03-11 04:27:36,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:27:36,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:27:36,820 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:27:36,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:27:36,822 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:27:36,824 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:27:36,825 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:27:36,825 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-03-11 04:27:36,825 WARN L342 ceAbstractionStarter]: 15 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:27:36,825 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 16 thread instances. [2021-03-11 04:27:36,843 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:27:36,843 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:27:36,844 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:27:36,844 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:27:36,844 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:27:36,844 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:27:36,844 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:27:36,844 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:27:36,844 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:27:36,844 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:27:36,845 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 86 places, 53 transitions, 426 flow [2021-03-11 04:27:36,851 INFO L129 PetriNetUnfolder]: 0/101 cut-off events. [2021-03-11 04:27:36,851 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:27:36,851 INFO L84 FinitePrefix]: Finished finitePrefix Result has 286 conditions, 101 events. 0/101 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 329 event pairs, 0 based on Foata normal form. 0/84 useless extension candidates. Maximal degree in co-relation 0. Up to 17 conditions per place. [2021-03-11 04:27:36,851 INFO L82 GeneralOperation]: Start removeDead. Operand has 86 places, 53 transitions, 426 flow [2021-03-11 04:27:36,852 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 84 places, 51 transitions, 422 flow [2021-03-11 04:27:36,852 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-11 04:27:36,852 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:27:36,853 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:27:36,853 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:27:36,853 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:27:36,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:27:36,853 INFO L82 PathProgramCache]: Analyzing trace with hash 16675, now seen corresponding path program 1 times [2021-03-11 04:27:36,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:27:36,853 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272178139] [2021-03-11 04:27:36,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:27:36,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:27:36,858 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:27:36,859 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:27:36,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:27:36,861 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272178139] [2021-03-11 04:27:36,861 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:27:36,862 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:27:36,862 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941174819] [2021-03-11 04:27:36,862 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:27:36,862 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:27:36,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:27:36,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:27:36,863 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 34 out of 53 [2021-03-11 04:27:36,863 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 84 places, 51 transitions, 422 flow. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 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) [2021-03-11 04:27:36,863 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:27:36,863 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 34 of 53 [2021-03-11 04:27:36,863 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:29:54,203 INFO L129 PetriNetUnfolder]: 458753/589841 cut-off events. [2021-03-11 04:29:54,204 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:30:02,941 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1114316 conditions, 589841 events. 458753/589841 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 33970. Compared 4325577 event pairs, 458753 based on Foata normal form. 65552/651238 useless extension candidates. Maximal degree in co-relation 1114111. Up to 524289 conditions per place. [2021-03-11 04:30:05,604 INFO L132 encePairwiseOnDemand]: 51/53 looper letters, 16 selfloop transitions, 1 changer transitions 0/50 dead transitions. [2021-03-11 04:30:05,605 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 85 places, 50 transitions, 454 flow [2021-03-11 04:30:05,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:30:05,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:30:05,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 120 transitions. [2021-03-11 04:30:05,605 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7547169811320755 [2021-03-11 04:30:05,606 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 120 transitions. [2021-03-11 04:30:05,606 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 120 transitions. [2021-03-11 04:30:05,606 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:30:05,606 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 120 transitions. [2021-03-11 04:30:05,606 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 40.0) internal successors, (120), 3 states have internal predecessors, (120), 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) [2021-03-11 04:30:05,606 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 53.0) internal successors, (212), 4 states have internal predecessors, (212), 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) [2021-03-11 04:30:05,607 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 53.0) internal successors, (212), 4 states have internal predecessors, (212), 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) [2021-03-11 04:30:05,607 INFO L185 Difference]: Start difference. First operand has 84 places, 51 transitions, 422 flow. Second operand 3 states and 120 transitions. [2021-03-11 04:30:05,607 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 85 places, 50 transitions, 454 flow [2021-03-11 04:30:05,609 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 85 places, 50 transitions, 214 flow, removed 120 selfloop flow, removed 0 redundant places. [2021-03-11 04:30:05,609 INFO L241 Difference]: Finished difference. Result has 85 places, 50 transitions, 182 flow [2021-03-11 04:30:05,609 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=53, PETRI_DIFFERENCE_MINUEND_FLOW=180, PETRI_DIFFERENCE_MINUEND_PLACES=83, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=50, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=49, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=182, PETRI_PLACES=85, PETRI_TRANSITIONS=50} [2021-03-11 04:30:05,610 INFO L335 CegarLoopForPetriNet]: 84 programPoint places, 1 predicate places. [2021-03-11 04:30:05,610 INFO L480 AbstractCegarLoop]: Abstraction has has 85 places, 50 transitions, 182 flow [2021-03-11 04:30:05,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 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) [2021-03-11 04:30:05,610 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:30:05,610 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:30:05,610 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-03-11 04:30:05,610 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:30:05,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:30:05,610 INFO L82 PathProgramCache]: Analyzing trace with hash 916427584, now seen corresponding path program 1 times [2021-03-11 04:30:05,610 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:30:05,611 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216299121] [2021-03-11 04:30:05,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:30:05,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:30:05,614 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:30:05,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:30:05,616 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:30:05,618 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:30:05,618 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:30:05,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-03-11 04:30:05,618 WARN L342 ceAbstractionStarter]: 16 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:30:05,618 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 17 thread instances. [2021-03-11 04:30:05,635 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 04:30:05,635 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:30:05,636 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:30:05,636 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:30:05,636 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:30:05,636 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:30:05,636 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:30:05,636 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:30:05,636 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:30:05,636 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:30:05,637 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 91 places, 56 transitions, 469 flow [2021-03-11 04:30:05,643 INFO L129 PetriNetUnfolder]: 0/107 cut-off events. [2021-03-11 04:30:05,643 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:30:05,643 INFO L84 FinitePrefix]: Finished finitePrefix Result has 312 conditions, 107 events. 0/107 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 351 event pairs, 0 based on Foata normal form. 0/89 useless extension candidates. Maximal degree in co-relation 0. Up to 18 conditions per place. [2021-03-11 04:30:05,643 INFO L82 GeneralOperation]: Start removeDead. Operand has 91 places, 56 transitions, 469 flow [2021-03-11 04:30:05,643 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 89 places, 54 transitions, 465 flow [2021-03-11 04:30:05,644 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-11 04:30:05,644 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:30:05,644 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:30:05,644 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-11 04:30:05,644 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:30:05,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:30:05,644 INFO L82 PathProgramCache]: Analyzing trace with hash 18467, now seen corresponding path program 1 times [2021-03-11 04:30:05,644 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:30:05,644 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679680226] [2021-03-11 04:30:05,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:30:05,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:30:05,648 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:30:05,649 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:30:05,651 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:30:05,651 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679680226] [2021-03-11 04:30:05,651 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:30:05,651 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-11 04:30:05,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199954215] [2021-03-11 04:30:05,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:30:05,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:30:05,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:30:05,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:30:05,652 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 56 [2021-03-11 04:30:05,652 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 89 places, 54 transitions, 465 flow. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 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) [2021-03-11 04:30:05,652 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:30:05,652 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 56 [2021-03-11 04:30:05,652 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand