/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/jm2006.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 22:33:19,068 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 22:33:19,086 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:33:19,087 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:33:19,088 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:33:19,090 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:33:19,091 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:33:19,092 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:33:19,093 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:33:19,094 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:33:19,095 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:33:19,096 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:33:19,097 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:33:19,098 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:33:19,099 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:33:19,099 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:33:19,101 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:33:19,103 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:33:19,105 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:33:19,106 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:33:19,107 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:33:19,108 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:33:19,110 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 22:33:19,118 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 22:33:19,119 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 22:33:19,120 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 22:33:19,120 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 22:33:19,135 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:33:19,135 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:33:19,137 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:33:19,137 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:33:19,137 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:33:19,137 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:33:19,137 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:33:19,138 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:33:19,138 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:33:19,138 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:33:19,138 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:33:19,138 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:33:19,139 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:33:19,139 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:33:19,139 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:33:19,139 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:33:19,139 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:33:19,140 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:33:19,140 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:33:19,140 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:33:19,140 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:33:19,140 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:33:19,141 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:33:19,141 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:33:19,141 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:33:19,141 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:33:19,141 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:19,141 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:33:19,142 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:33:19,142 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 22:33:19,455 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:33:19,467 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:33:19,471 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:33:19,472 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:33:19,472 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:33:19,473 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/jm2006.i [2020-07-20 22:33:19,534 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba40d5780/61996b8f06e2477084546a9ae80ba742/FLAGa3c26e1cf [2020-07-20 22:33:19,988 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:33:19,989 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006.i [2020-07-20 22:33:19,995 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba40d5780/61996b8f06e2477084546a9ae80ba742/FLAGa3c26e1cf [2020-07-20 22:33:20,393 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba40d5780/61996b8f06e2477084546a9ae80ba742 [2020-07-20 22:33:20,401 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:33:20,403 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:33:20,404 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:33:20,404 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:33:20,408 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:33:20,409 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:33:20" (1/1) ... [2020-07-20 22:33:20,412 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44427513 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:33:20, skipping insertion in model container [2020-07-20 22:33:20,412 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:33:20" (1/1) ... [2020-07-20 22:33:20,419 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:33:20,434 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:33:20,592 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:33:20,596 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:33:20,612 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:33:20,627 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:33:20,627 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:33:20 WrapperNode [2020-07-20 22:33:20,627 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:33:20,628 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:33:20,628 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:33:20,628 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:33:20,640 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:33:20" (1/1) ... [2020-07-20 22:33:20,640 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:33:20" (1/1) ... [2020-07-20 22:33:20,723 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:33:20" (1/1) ... [2020-07-20 22:33:20,723 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:33:20" (1/1) ... [2020-07-20 22:33:20,727 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:33:20" (1/1) ... [2020-07-20 22:33:20,732 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:33:20" (1/1) ... [2020-07-20 22:33:20,733 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:33:20" (1/1) ... [2020-07-20 22:33:20,735 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:33:20,735 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:33:20,735 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:33:20,735 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:33:20,736 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:33:20" (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 [2020-07-20 22:33:20,796 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:33:20,796 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:33:20,797 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 22:33:20,797 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 22:33:20,797 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:33:20,797 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:33:20,797 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 22:33:20,797 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 22:33:20,797 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 22:33:20,798 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 22:33:20,798 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:33:20,798 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:33:20,798 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:33:21,000 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:33:21,000 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 22:33:21,004 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:33:21 BoogieIcfgContainer [2020-07-20 22:33:21,004 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:33:21,005 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:33:21,005 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:33:21,008 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:33:21,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:33:20" (1/3) ... [2020-07-20 22:33:21,009 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@130d44a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:33:21, skipping insertion in model container [2020-07-20 22:33:21,010 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:33:20" (2/3) ... [2020-07-20 22:33:21,010 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@130d44a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:33:21, skipping insertion in model container [2020-07-20 22:33:21,010 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:33:21" (3/3) ... [2020-07-20 22:33:21,012 INFO L109 eAbstractionObserver]: Analyzing ICFG jm2006.i [2020-07-20 22:33:21,023 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:33:21,030 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 22:33:21,046 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 22:33:21,075 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:33:21,076 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:33:21,076 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:33:21,076 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:33:21,076 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:33:21,076 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:33:21,077 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:33:21,077 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:33:21,099 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 22:33:21,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 22:33:21,106 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:33:21,107 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:33:21,108 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:33:21,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:33:21,115 INFO L82 PathProgramCache]: Analyzing trace with hash -42161200, now seen corresponding path program 1 times [2020-07-20 22:33:21,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:33:21,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255096311] [2020-07-20 22:33:21,144 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:21,223 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:33:21,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:33:21,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 22:33:21,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:21,325 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 22:33:21,370 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:33:21,370 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:33:21,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [255096311] [2020-07-20 22:33:21,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:33:21,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 22:33:21,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189249909] [2020-07-20 22:33:21,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 22:33:21,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:33:21,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 22:33:21,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-20 22:33:21,396 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 7 states. [2020-07-20 22:33:21,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:33:21,576 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2020-07-20 22:33:21,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 22:33:21,579 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-07-20 22:33:21,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:33:21,587 INFO L225 Difference]: With dead ends: 46 [2020-07-20 22:33:21,588 INFO L226 Difference]: Without dead ends: 14 [2020-07-20 22:33:21,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-07-20 22:33:21,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-20 22:33:21,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-20 22:33:21,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-20 22:33:21,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-20 22:33:21,637 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-20 22:33:21,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:33:21,638 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-20 22:33:21,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 22:33:21,639 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-20 22:33:21,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 22:33:21,640 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:33:21,641 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:33:21,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:21,857 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:33:21,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:33:21,858 INFO L82 PathProgramCache]: Analyzing trace with hash 219103455, now seen corresponding path program 1 times [2020-07-20 22:33:21,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:33:21,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1177853325] [2020-07-20 22:33:21,861 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:21,887 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:33:21,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:33:21,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 22:33:21,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:21,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:33:21,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:33:22,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:33:22,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:33:22,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1177853325] [2020-07-20 22:33:22,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:33:22,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-20 22:33:22,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451476824] [2020-07-20 22:33:22,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 22:33:22,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:33:22,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 22:33:22,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-20 22:33:22,100 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 11 states. [2020-07-20 22:33:22,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:33:22,297 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2020-07-20 22:33:22,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 22:33:22,298 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 13 [2020-07-20 22:33:22,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:33:22,299 INFO L225 Difference]: With dead ends: 25 [2020-07-20 22:33:22,299 INFO L226 Difference]: Without dead ends: 17 [2020-07-20 22:33:22,301 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2020-07-20 22:33:22,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-20 22:33:22,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-20 22:33:22,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-20 22:33:22,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-07-20 22:33:22,307 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2020-07-20 22:33:22,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:33:22,307 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-07-20 22:33:22,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 22:33:22,307 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-07-20 22:33:22,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 22:33:22,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:33:22,308 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:33:22,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:22,523 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:33:22,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:33:22,524 INFO L82 PathProgramCache]: Analyzing trace with hash -1744767088, now seen corresponding path program 2 times [2020-07-20 22:33:22,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:33:22,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064699438] [2020-07-20 22:33:22,525 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:22,554 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:33:22,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:33:22,556 WARN L261 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 22:33:22,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:22,681 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:33:22,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:33:22,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:33:22,891 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:33:22,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064699438] [2020-07-20 22:33:22,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:33:22,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2020-07-20 22:33:22,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94287953] [2020-07-20 22:33:22,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 22:33:22,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:33:22,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 22:33:22,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 22:33:22,897 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 17 states. [2020-07-20 22:33:23,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:33:23,421 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2020-07-20 22:33:23,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 22:33:23,422 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2020-07-20 22:33:23,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:33:23,423 INFO L225 Difference]: With dead ends: 31 [2020-07-20 22:33:23,423 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 22:33:23,425 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=188, Invalid=514, Unknown=0, NotChecked=0, Total=702 [2020-07-20 22:33:23,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 22:33:23,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-20 22:33:23,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-20 22:33:23,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-07-20 22:33:23,437 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 16 [2020-07-20 22:33:23,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:33:23,437 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-07-20 22:33:23,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 22:33:23,438 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-07-20 22:33:23,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 22:33:23,439 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:33:23,440 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:33:23,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:23,643 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:33:23,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:33:23,644 INFO L82 PathProgramCache]: Analyzing trace with hash -1040440016, now seen corresponding path program 3 times [2020-07-20 22:33:23,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:33:23,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1689962764] [2020-07-20 22:33:23,646 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:23,687 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:33:23,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:33:23,689 WARN L261 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 22:33:23,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:23,944 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:33:23,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:33:23,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:33:24,400 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:33:24,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1689962764] [2020-07-20 22:33:24,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:33:24,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 29 [2020-07-20 22:33:24,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221438318] [2020-07-20 22:33:24,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 22:33:24,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:33:24,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 22:33:24,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=631, Unknown=0, NotChecked=0, Total=812 [2020-07-20 22:33:24,403 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 29 states. [2020-07-20 22:33:24,907 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-07-20 22:33:25,172 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 49 [2020-07-20 22:33:26,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:33:26,043 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2020-07-20 22:33:26,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 22:33:26,044 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 22 [2020-07-20 22:33:26,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:33:26,045 INFO L225 Difference]: With dead ends: 43 [2020-07-20 22:33:26,045 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 22:33:26,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=560, Invalid=1420, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 22:33:26,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 22:33:26,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-20 22:33:26,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 22:33:26,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-07-20 22:33:26,056 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 22 [2020-07-20 22:33:26,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:33:26,057 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-07-20 22:33:26,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 22:33:26,057 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-07-20 22:33:26,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 22:33:26,058 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:33:26,058 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:33:26,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:26,273 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:33:26,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:33:26,274 INFO L82 PathProgramCache]: Analyzing trace with hash -276146064, now seen corresponding path program 4 times [2020-07-20 22:33:26,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:33:26,275 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363445133] [2020-07-20 22:33:26,276 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:26,322 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:33:26,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:33:26,325 WARN L261 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-20 22:33:26,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:27,033 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:33:27,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:33:27,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:33:28,553 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:33:28,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363445133] [2020-07-20 22:33:28,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:33:28,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 53 [2020-07-20 22:33:28,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846202338] [2020-07-20 22:33:28,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-20 22:33:28,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:33:28,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-20 22:33:28,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=637, Invalid=2119, Unknown=0, NotChecked=0, Total=2756 [2020-07-20 22:33:28,557 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 53 states. [2020-07-20 22:33:29,498 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-20 22:33:29,891 WARN L193 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 98 [2020-07-20 22:33:30,208 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-20 22:33:30,541 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 119 DAG size of output: 97 [2020-07-20 22:33:30,852 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-20 22:33:31,238 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-20 22:33:31,532 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-20 22:33:31,831 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 22:33:32,115 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 22:33:32,386 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-20 22:33:32,651 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 22:33:35,382 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-20 22:33:35,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:33:35,405 INFO L93 Difference]: Finished difference Result 67 states and 90 transitions. [2020-07-20 22:33:35,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-20 22:33:35,406 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 34 [2020-07-20 22:33:35,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:33:35,407 INFO L225 Difference]: With dead ends: 67 [2020-07-20 22:33:35,407 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 22:33:35,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=1952, Invalid=4528, Unknown=0, NotChecked=0, Total=6480 [2020-07-20 22:33:35,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 22:33:35,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-07-20 22:33:35,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-20 22:33:35,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-07-20 22:33:35,426 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 34 [2020-07-20 22:33:35,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:33:35,427 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-07-20 22:33:35,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-20 22:33:35,427 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-07-20 22:33:35,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-20 22:33:35,429 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:33:35,429 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:33:35,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:35,644 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:33:35,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:33:35,645 INFO L82 PathProgramCache]: Analyzing trace with hash -2111955216, now seen corresponding path program 5 times [2020-07-20 22:33:35,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:33:35,646 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1490363794] [2020-07-20 22:33:35,646 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:35,734 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:33:35,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:33:35,739 WARN L261 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 195 conjunts are in the unsatisfiable core [2020-07-20 22:33:35,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:38,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:33:38,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:33:38,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:33:43,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:33:43,739 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1490363794] [2020-07-20 22:33:43,739 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:33:43,739 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 101 [2020-07-20 22:33:43,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732918574] [2020-07-20 22:33:43,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-20 22:33:43,740 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:33:43,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-20 22:33:43,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2413, Invalid=7687, Unknown=0, NotChecked=0, Total=10100 [2020-07-20 22:33:43,744 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 101 states. [2020-07-20 22:33:46,934 WARN L193 SmtUtils]: Spent 426.00 ms on a formula simplification that was a NOOP. DAG size: 242 [2020-07-20 22:33:47,916 WARN L193 SmtUtils]: Spent 737.00 ms on a formula simplification. DAG size of input: 240 DAG size of output: 194 [2020-07-20 22:33:49,116 WARN L193 SmtUtils]: Spent 410.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-20 22:33:50,005 WARN L193 SmtUtils]: Spent 713.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 193 [2020-07-20 22:33:51,176 WARN L193 SmtUtils]: Spent 395.00 ms on a formula simplification that was a NOOP. DAG size: 232 [2020-07-20 22:33:52,530 WARN L193 SmtUtils]: Spent 382.00 ms on a formula simplification that was a NOOP. DAG size: 227 [2020-07-20 22:33:53,675 WARN L193 SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 222 [2020-07-20 22:33:54,834 WARN L193 SmtUtils]: Spent 371.00 ms on a formula simplification that was a NOOP. DAG size: 217 [2020-07-20 22:33:55,962 WARN L193 SmtUtils]: Spent 354.00 ms on a formula simplification that was a NOOP. DAG size: 212 [2020-07-20 22:33:57,078 WARN L193 SmtUtils]: Spent 361.00 ms on a formula simplification that was a NOOP. DAG size: 207 [2020-07-20 22:33:58,133 WARN L193 SmtUtils]: Spent 330.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-07-20 22:33:59,184 WARN L193 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2020-07-20 22:34:00,221 WARN L193 SmtUtils]: Spent 320.00 ms on a formula simplification that was a NOOP. DAG size: 192 [2020-07-20 22:34:01,200 WARN L193 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-07-20 22:34:02,180 WARN L193 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 182 [2020-07-20 22:34:03,138 WARN L193 SmtUtils]: Spent 296.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2020-07-20 22:34:04,062 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-20 22:34:04,975 WARN L193 SmtUtils]: Spent 277.00 ms on a formula simplification that was a NOOP. DAG size: 167 [2020-07-20 22:34:05,849 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 162 [2020-07-20 22:34:06,702 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 157 [2020-07-20 22:34:07,561 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 152 [2020-07-20 22:34:08,395 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 147 [2020-07-20 22:34:09,204 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-20 22:34:09,985 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2020-07-20 22:34:10,751 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-20 22:34:11,489 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2020-07-20 22:34:12,206 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-20 22:34:12,906 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-20 22:34:13,586 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-20 22:34:14,237 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-20 22:34:14,870 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-20 22:34:15,481 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 22:34:16,079 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 22:34:16,646 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-20 22:34:17,194 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 22:34:17,728 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 22:34:18,238 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 22:34:24,023 WARN L193 SmtUtils]: Spent 460.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-20 22:34:24,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:34:24,041 INFO L93 Difference]: Finished difference Result 115 states and 162 transitions. [2020-07-20 22:34:24,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-20 22:34:24,042 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 58 [2020-07-20 22:34:24,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:34:24,043 INFO L225 Difference]: With dead ends: 115 [2020-07-20 22:34:24,044 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 22:34:24,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1598 ImplicationChecksByTransitivity, 45.0s TimeCoverageRelationStatistics Valid=7328, Invalid=15928, Unknown=0, NotChecked=0, Total=23256 [2020-07-20 22:34:24,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 22:34:24,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2020-07-20 22:34:24,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 22:34:24,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-07-20 22:34:24,079 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 58 [2020-07-20 22:34:24,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:34:24,080 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-07-20 22:34:24,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-20 22:34:24,080 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-07-20 22:34:24,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-20 22:34:24,082 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:34:24,082 INFO L422 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:34:24,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:34:24,295 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:34:24,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:34:24,296 INFO L82 PathProgramCache]: Analyzing trace with hash -236770320, now seen corresponding path program 6 times [2020-07-20 22:34:24,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:34:24,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1561258674] [2020-07-20 22:34:24,297 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:34:24,428 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:34:24,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:34:24,442 WARN L261 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 387 conjunts are in the unsatisfiable core [2020-07-20 22:34:24,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:34:33,835 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:34:33,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:34:34,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:35:02,025 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:35:02,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1561258674] [2020-07-20 22:35:02,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:35:02,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101] total 197 [2020-07-20 22:35:02,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991562247] [2020-07-20 22:35:02,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 197 states [2020-07-20 22:35:02,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:35:02,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 197 interpolants. [2020-07-20 22:35:02,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9421, Invalid=29191, Unknown=0, NotChecked=0, Total=38612 [2020-07-20 22:35:02,035 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 197 states. [2020-07-20 22:35:17,449 WARN L193 SmtUtils]: Spent 1.47 s on a formula simplification that was a NOOP. DAG size: 482 [2020-07-20 22:35:20,895 WARN L193 SmtUtils]: Spent 2.71 s on a formula simplification. DAG size of input: 480 DAG size of output: 386 [2020-07-20 22:35:30,242 WARN L193 SmtUtils]: Spent 1.68 s on a formula simplification that was a NOOP. DAG size: 477 [2020-07-20 22:35:33,507 WARN L193 SmtUtils]: Spent 2.67 s on a formula simplification. DAG size of input: 479 DAG size of output: 385 [2020-07-20 22:35:43,448 WARN L193 SmtUtils]: Spent 1.85 s on a formula simplification that was a NOOP. DAG size: 472 [2020-07-20 22:35:55,101 WARN L193 SmtUtils]: Spent 2.00 s on a formula simplification that was a NOOP. DAG size: 467 [2020-07-20 22:36:06,254 WARN L193 SmtUtils]: Spent 1.93 s on a formula simplification that was a NOOP. DAG size: 462 [2020-07-20 22:36:17,953 WARN L193 SmtUtils]: Spent 2.07 s on a formula simplification that was a NOOP. DAG size: 457 [2020-07-20 22:36:30,424 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 452 [2020-07-20 22:36:43,611 WARN L193 SmtUtils]: Spent 2.23 s on a formula simplification that was a NOOP. DAG size: 447 [2020-07-20 22:36:57,907 WARN L193 SmtUtils]: Spent 2.40 s on a formula simplification that was a NOOP. DAG size: 442 [2020-07-20 22:37:14,138 WARN L193 SmtUtils]: Spent 2.62 s on a formula simplification that was a NOOP. DAG size: 437 [2020-07-20 22:37:32,053 WARN L193 SmtUtils]: Spent 2.72 s on a formula simplification that was a NOOP. DAG size: 432 [2020-07-20 22:37:51,061 WARN L193 SmtUtils]: Spent 2.88 s on a formula simplification that was a NOOP. DAG size: 427 [2020-07-20 22:38:11,049 WARN L193 SmtUtils]: Spent 2.95 s on a formula simplification that was a NOOP. DAG size: 422 [2020-07-20 22:38:31,527 WARN L193 SmtUtils]: Spent 3.03 s on a formula simplification that was a NOOP. DAG size: 417 [2020-07-20 22:38:51,627 WARN L193 SmtUtils]: Spent 3.07 s on a formula simplification that was a NOOP. DAG size: 412 [2020-07-20 22:39:09,713 WARN L193 SmtUtils]: Spent 3.11 s on a formula simplification that was a NOOP. DAG size: 407 [2020-07-20 22:39:29,324 WARN L193 SmtUtils]: Spent 2.69 s on a formula simplification that was a NOOP. DAG size: 402 [2020-07-20 22:39:50,008 WARN L193 SmtUtils]: Spent 3.19 s on a formula simplification that was a NOOP. DAG size: 397 [2020-07-20 22:40:10,924 WARN L193 SmtUtils]: Spent 3.28 s on a formula simplification that was a NOOP. DAG size: 392 [2020-07-20 22:40:31,788 WARN L193 SmtUtils]: Spent 3.26 s on a formula simplification that was a NOOP. DAG size: 387 [2020-07-20 22:40:53,063 WARN L193 SmtUtils]: Spent 3.24 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-20 22:41:14,699 WARN L193 SmtUtils]: Spent 2.86 s on a formula simplification that was a NOOP. DAG size: 377 [2020-07-20 22:41:37,064 WARN L193 SmtUtils]: Spent 3.18 s on a formula simplification that was a NOOP. DAG size: 372 [2020-07-20 22:41:58,952 WARN L193 SmtUtils]: Spent 3.32 s on a formula simplification that was a NOOP. DAG size: 367 [2020-07-20 22:42:20,931 WARN L193 SmtUtils]: Spent 3.22 s on a formula simplification that was a NOOP. DAG size: 362 [2020-07-20 22:42:41,471 WARN L193 SmtUtils]: Spent 2.94 s on a formula simplification that was a NOOP. DAG size: 357 [2020-07-20 22:43:01,761 WARN L193 SmtUtils]: Spent 2.75 s on a formula simplification that was a NOOP. DAG size: 352 [2020-07-20 22:43:21,924 WARN L193 SmtUtils]: Spent 2.86 s on a formula simplification that was a NOOP. DAG size: 347 [2020-07-20 22:43:41,516 WARN L193 SmtUtils]: Spent 2.87 s on a formula simplification that was a NOOP. DAG size: 342 [2020-07-20 22:44:02,093 WARN L193 SmtUtils]: Spent 3.06 s on a formula simplification that was a NOOP. DAG size: 337 [2020-07-20 22:44:23,101 WARN L193 SmtUtils]: Spent 3.11 s on a formula simplification that was a NOOP. DAG size: 332 [2020-07-20 22:44:44,491 WARN L193 SmtUtils]: Spent 2.77 s on a formula simplification that was a NOOP. DAG size: 327 [2020-07-20 22:45:06,785 WARN L193 SmtUtils]: Spent 3.35 s on a formula simplification that was a NOOP. DAG size: 322 [2020-07-20 22:45:27,262 WARN L193 SmtUtils]: Spent 2.80 s on a formula simplification that was a NOOP. DAG size: 317 [2020-07-20 22:45:46,305 WARN L193 SmtUtils]: Spent 2.70 s on a formula simplification that was a NOOP. DAG size: 312 [2020-07-20 22:46:05,486 WARN L193 SmtUtils]: Spent 2.44 s on a formula simplification that was a NOOP. DAG size: 307 [2020-07-20 22:46:24,439 WARN L193 SmtUtils]: Spent 2.71 s on a formula simplification that was a NOOP. DAG size: 302 [2020-07-20 22:46:43,865 WARN L193 SmtUtils]: Spent 2.85 s on a formula simplification that was a NOOP. DAG size: 297 [2020-07-20 22:47:04,286 WARN L193 SmtUtils]: Spent 2.88 s on a formula simplification that was a NOOP. DAG size: 292 [2020-07-20 22:47:25,357 WARN L193 SmtUtils]: Spent 2.81 s on a formula simplification that was a NOOP. DAG size: 287 [2020-07-20 22:47:46,209 WARN L193 SmtUtils]: Spent 2.95 s on a formula simplification that was a NOOP. DAG size: 282