/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 NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/nested9.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 14:14:33,084 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 14:14:33,088 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 14:14:33,113 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 14:14:33,114 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 14:14:33,116 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 14:14:33,118 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 14:14:33,131 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 14:14:33,136 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 14:14:33,137 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 14:14:33,139 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 14:14:33,141 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 14:14:33,141 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 14:14:33,145 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 14:14:33,147 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 14:14:33,149 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 14:14:33,150 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 14:14:33,153 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 14:14:33,155 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 14:14:33,161 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 14:14:33,167 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 14:14:33,171 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 14:14:33,173 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 14:14:33,174 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 14:14:33,177 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 14:14:33,191 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 14:14:33,191 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 14:14:33,193 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 14:14:33,194 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 [2020-07-21 14:14:33,234 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 14:14:33,235 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 14:14:33,240 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 14:14:33,244 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 14:14:33,245 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 14:14:33,245 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 14:14:33,245 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 14:14:33,246 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 14:14:33,246 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 14:14:33,246 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 14:14:33,246 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 14:14:33,246 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 14:14:33,247 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 14:14:33,247 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 14:14:33,247 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 14:14:33,247 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 14:14:33,248 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 14:14:33,248 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 14:14:33,248 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 14:14:33,250 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 14:14:33,250 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 14:14:33,250 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:14:33,250 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 14:14:33,251 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 14:14:33,251 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 14:14:33,251 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 14:14:33,253 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:33,253 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 14:14:33,253 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 14:14:33,253 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 -> NUM_FUNCTIONS 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 -> 2 [2020-07-21 14:14:33,594 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 14:14:33,620 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 14:14:33,624 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 14:14:33,626 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 14:14:33,626 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 14:14:33,628 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-21 14:14:33,715 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/956f386a9/19c6c55e9d4342bf97fa7d443e1420db/FLAG012087489 [2020-07-21 14:14:34,279 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 14:14:34,280 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-21 14:14:34,286 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/956f386a9/19c6c55e9d4342bf97fa7d443e1420db/FLAG012087489 [2020-07-21 14:14:34,619 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/956f386a9/19c6c55e9d4342bf97fa7d443e1420db [2020-07-21 14:14:34,632 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 14:14:34,635 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 14:14:34,637 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 14:14:34,637 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 14:14:34,641 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 14:14:34,642 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:14:34" (1/1) ... [2020-07-21 14:14:34,646 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b45841e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:34, skipping insertion in model container [2020-07-21 14:14:34,646 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:14:34" (1/1) ... [2020-07-21 14:14:34,655 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 14:14:34,675 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 14:14:34,900 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:14:34,905 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 14:14:34,927 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:14:34,945 INFO L208 MainTranslator]: Completed translation [2020-07-21 14:14:34,945 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:34 WrapperNode [2020-07-21 14:14:34,945 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 14:14:34,946 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 14:14:34,947 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 14:14:34,947 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 14:14:34,962 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:34" (1/1) ... [2020-07-21 14:14:34,962 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:34" (1/1) ... [2020-07-21 14:14:34,969 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:34" (1/1) ... [2020-07-21 14:14:34,970 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:34" (1/1) ... [2020-07-21 14:14:34,975 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:34" (1/1) ... [2020-07-21 14:14:34,981 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:34" (1/1) ... [2020-07-21 14:14:34,983 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:34" (1/1) ... [2020-07-21 14:14:35,084 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 14:14:35,084 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 14:14:35,084 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 14:14:35,085 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 14:14:35,089 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:34" (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 [2020-07-21 14:14:35,163 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 14:14:35,163 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 14:14:35,164 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 14:14:35,164 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 14:14:35,164 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 14:14:35,164 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 14:14:35,164 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 14:14:35,164 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 14:14:35,165 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 14:14:35,165 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 14:14:35,165 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 14:14:35,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 14:14:35,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 14:14:35,428 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 14:14:35,428 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 14:14:35,433 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:14:35 BoogieIcfgContainer [2020-07-21 14:14:35,434 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 14:14:35,435 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 14:14:35,436 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 14:14:35,439 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 14:14:35,440 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:14:34" (1/3) ... [2020-07-21 14:14:35,441 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@698fb99a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:14:35, skipping insertion in model container [2020-07-21 14:14:35,441 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:34" (2/3) ... [2020-07-21 14:14:35,442 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@698fb99a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:14:35, skipping insertion in model container [2020-07-21 14:14:35,442 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:14:35" (3/3) ... [2020-07-21 14:14:35,444 INFO L109 eAbstractionObserver]: Analyzing ICFG nested9.i [2020-07-21 14:14:35,458 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 14:14:35,466 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 14:14:35,487 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 14:14:35,523 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 14:14:35,523 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 14:14:35,523 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 14:14:35,524 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 14:14:35,525 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 14:14:35,526 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 14:14:35,526 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 14:14:35,526 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 14:14:35,576 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-21 14:14:35,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 14:14:35,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:35,594 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:35,595 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:35,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:35,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1671060194, now seen corresponding path program 1 times [2020-07-21 14:14:35,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:35,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024149366] [2020-07-21 14:14:35,616 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:14:35,711 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:35,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:35,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 14:14:35,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:35,791 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:14:35,793 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:14:35,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024149366] [2020-07-21 14:14:35,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:14:35,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 14:14:35,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752735262] [2020-07-21 14:14:35,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 14:14:35,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:35,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 14:14:35,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 14:14:35,822 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 4 states. [2020-07-21 14:14:35,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:35,901 INFO L93 Difference]: Finished difference Result 53 states and 74 transitions. [2020-07-21 14:14:35,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 14:14:35,903 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-07-21 14:14:35,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:35,912 INFO L225 Difference]: With dead ends: 53 [2020-07-21 14:14:35,912 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 14:14:35,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 14:14:35,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 14:14:35,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2020-07-21 14:14:35,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 14:14:35,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-07-21 14:14:35,957 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2020-07-21 14:14:35,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:35,958 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-07-21 14:14:35,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 14:14:35,958 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-07-21 14:14:35,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 14:14:35,959 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:35,960 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:36,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:36,162 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:36,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:36,163 INFO L82 PathProgramCache]: Analyzing trace with hash 514965223, now seen corresponding path program 1 times [2020-07-21 14:14:36,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:36,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [407830090] [2020-07-21 14:14:36,165 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:14:36,210 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:36,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:36,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 14:14:36,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:36,266 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:36,274 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:36,324 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 14:14:36,324 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:14:36,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [407830090] [2020-07-21 14:14:36,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:14:36,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 14:14:36,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023056321] [2020-07-21 14:14:36,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 14:14:36,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:36,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 14:14:36,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 14:14:36,330 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 6 states. [2020-07-21 14:14:36,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:36,461 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2020-07-21 14:14:36,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 14:14:36,462 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2020-07-21 14:14:36,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:36,464 INFO L225 Difference]: With dead ends: 46 [2020-07-21 14:14:36,464 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 14:14:36,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 14:14:36,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 14:14:36,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2020-07-21 14:14:36,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 14:14:36,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-07-21 14:14:36,477 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 21 [2020-07-21 14:14:36,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:36,477 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-07-21 14:14:36,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 14:14:36,478 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-07-21 14:14:36,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 14:14:36,479 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:36,479 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:36,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:36,693 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:36,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:36,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1134636734, now seen corresponding path program 1 times [2020-07-21 14:14:36,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:36,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1297528584] [2020-07-21 14:14:36,697 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:14:36,751 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:36,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:36,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 14:14:36,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:36,907 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:14:36,908 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:14:36,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1297528584] [2020-07-21 14:14:36,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:14:36,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 14:14:36,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053225627] [2020-07-21 14:14:36,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 14:14:36,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:36,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 14:14:36,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 14:14:36,920 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 8 states. [2020-07-21 14:14:37,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:37,132 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2020-07-21 14:14:37,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 14:14:37,133 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 28 [2020-07-21 14:14:37,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:37,138 INFO L225 Difference]: With dead ends: 68 [2020-07-21 14:14:37,138 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 14:14:37,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2020-07-21 14:14:37,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 14:14:37,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2020-07-21 14:14:37,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 14:14:37,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2020-07-21 14:14:37,156 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 28 [2020-07-21 14:14:37,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:37,157 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2020-07-21 14:14:37,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 14:14:37,157 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2020-07-21 14:14:37,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 14:14:37,160 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:37,160 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:37,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:37,375 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:37,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:37,376 INFO L82 PathProgramCache]: Analyzing trace with hash -670641491, now seen corresponding path program 1 times [2020-07-21 14:14:37,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:37,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1458649974] [2020-07-21 14:14:37,377 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:14:37,428 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:37,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:37,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 14:14:37,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:37,516 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:37,519 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:37,546 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 18 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 14:14:37,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:37,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:37,680 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 11 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 14:14:37,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1458649974] [2020-07-21 14:14:37,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:37,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2020-07-21 14:14:37,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755206165] [2020-07-21 14:14:37,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 14:14:37,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:37,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 14:14:37,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2020-07-21 14:14:37,684 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand 16 states. [2020-07-21 14:14:38,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:38,252 INFO L93 Difference]: Finished difference Result 105 states and 129 transitions. [2020-07-21 14:14:38,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 14:14:38,253 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 41 [2020-07-21 14:14:38,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:38,258 INFO L225 Difference]: With dead ends: 105 [2020-07-21 14:14:38,259 INFO L226 Difference]: Without dead ends: 65 [2020-07-21 14:14:38,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=249, Invalid=563, Unknown=0, NotChecked=0, Total=812 [2020-07-21 14:14:38,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-21 14:14:38,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 55. [2020-07-21 14:14:38,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 14:14:38,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2020-07-21 14:14:38,289 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 41 [2020-07-21 14:14:38,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:38,291 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2020-07-21 14:14:38,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 14:14:38,292 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2020-07-21 14:14:38,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-21 14:14:38,297 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:38,298 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:38,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:38,499 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:38,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:38,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1941695900, now seen corresponding path program 2 times [2020-07-21 14:14:38,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:38,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1795786411] [2020-07-21 14:14:38,502 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:14:38,581 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:38,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:38,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 14:14:38,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:38,716 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 63 proven. 16 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-07-21 14:14:38,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:38,854 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 42 proven. 17 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-07-21 14:14:38,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1795786411] [2020-07-21 14:14:38,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:38,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-21 14:14:38,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715844834] [2020-07-21 14:14:38,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 14:14:38,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:38,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 14:14:38,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-07-21 14:14:38,858 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand 15 states. [2020-07-21 14:14:39,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:39,444 INFO L93 Difference]: Finished difference Result 131 states and 165 transitions. [2020-07-21 14:14:39,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 14:14:39,444 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 62 [2020-07-21 14:14:39,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:39,449 INFO L225 Difference]: With dead ends: 131 [2020-07-21 14:14:39,449 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 14:14:39,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 107 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=209, Invalid=603, Unknown=0, NotChecked=0, Total=812 [2020-07-21 14:14:39,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 14:14:39,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 65. [2020-07-21 14:14:39,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 14:14:39,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2020-07-21 14:14:39,484 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 62 [2020-07-21 14:14:39,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:39,489 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2020-07-21 14:14:39,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 14:14:39,489 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2020-07-21 14:14:39,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 14:14:39,494 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:39,494 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:39,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:39,710 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:39,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:39,711 INFO L82 PathProgramCache]: Analyzing trace with hash 1833574291, now seen corresponding path program 3 times [2020-07-21 14:14:39,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:39,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1618385712] [2020-07-21 14:14:39,713 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:14:39,757 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:39,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:39,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 14:14:39,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:39,931 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 78 proven. 59 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-07-21 14:14:39,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:40,089 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 55 proven. 60 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-07-21 14:14:40,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1618385712] [2020-07-21 14:14:40,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:40,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2020-07-21 14:14:40,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029268491] [2020-07-21 14:14:40,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 14:14:40,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:40,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 14:14:40,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2020-07-21 14:14:40,093 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand 19 states. [2020-07-21 14:14:41,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:41,020 INFO L93 Difference]: Finished difference Result 139 states and 173 transitions. [2020-07-21 14:14:41,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 14:14:41,027 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 79 [2020-07-21 14:14:41,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:41,031 INFO L225 Difference]: With dead ends: 139 [2020-07-21 14:14:41,031 INFO L226 Difference]: Without dead ends: 106 [2020-07-21 14:14:41,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 137 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=353, Invalid=1053, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 14:14:41,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-21 14:14:41,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 79. [2020-07-21 14:14:41,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-21 14:14:41,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 95 transitions. [2020-07-21 14:14:41,061 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 95 transitions. Word has length 79 [2020-07-21 14:14:41,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:41,062 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 95 transitions. [2020-07-21 14:14:41,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 14:14:41,062 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 95 transitions. [2020-07-21 14:14:41,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-07-21 14:14:41,064 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:41,064 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:41,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:41,278 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:41,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:41,279 INFO L82 PathProgramCache]: Analyzing trace with hash -832577267, now seen corresponding path program 4 times [2020-07-21 14:14:41,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:41,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1341763657] [2020-07-21 14:14:41,280 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:14:41,330 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:14:41,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:41,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 14:14:41,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:41,463 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 215 proven. 33 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 14:14:41,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:41,628 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 131 proven. 45 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-21 14:14:41,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1341763657] [2020-07-21 14:14:41,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:41,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2020-07-21 14:14:41,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992581928] [2020-07-21 14:14:41,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 14:14:41,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:41,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 14:14:41,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2020-07-21 14:14:41,631 INFO L87 Difference]: Start difference. First operand 79 states and 95 transitions. Second operand 16 states. [2020-07-21 14:14:42,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:42,031 INFO L93 Difference]: Finished difference Result 163 states and 204 transitions. [2020-07-21 14:14:42,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 14:14:42,031 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 99 [2020-07-21 14:14:42,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:42,034 INFO L225 Difference]: With dead ends: 163 [2020-07-21 14:14:42,035 INFO L226 Difference]: Without dead ends: 96 [2020-07-21 14:14:42,038 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 182 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=203, Invalid=447, Unknown=0, NotChecked=0, Total=650 [2020-07-21 14:14:42,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-07-21 14:14:42,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 86. [2020-07-21 14:14:42,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-21 14:14:42,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 102 transitions. [2020-07-21 14:14:42,075 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 102 transitions. Word has length 99 [2020-07-21 14:14:42,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:42,078 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 102 transitions. [2020-07-21 14:14:42,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 14:14:42,078 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 102 transitions. [2020-07-21 14:14:42,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 14:14:42,082 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:42,082 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:42,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:42,290 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:42,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:42,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1419871984, now seen corresponding path program 5 times [2020-07-21 14:14:42,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:42,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1426504325] [2020-07-21 14:14:42,293 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:42,343 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:42,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:42,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 14:14:42,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:42,494 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 110 proven. 120 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-07-21 14:14:42,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:42,662 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 75 proven. 121 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2020-07-21 14:14:42,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1426504325] [2020-07-21 14:14:42,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:42,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-21 14:14:42,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290455163] [2020-07-21 14:14:42,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 14:14:42,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:42,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 14:14:42,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2020-07-21 14:14:42,669 INFO L87 Difference]: Start difference. First operand 86 states and 102 transitions. Second operand 18 states. [2020-07-21 14:14:43,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:43,721 INFO L93 Difference]: Finished difference Result 168 states and 210 transitions. [2020-07-21 14:14:43,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 14:14:43,722 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 106 [2020-07-21 14:14:43,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:43,724 INFO L225 Difference]: With dead ends: 168 [2020-07-21 14:14:43,724 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 14:14:43,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 191 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=472, Invalid=1508, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 14:14:43,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 14:14:43,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 99. [2020-07-21 14:14:43,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-21 14:14:43,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 119 transitions. [2020-07-21 14:14:43,761 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 119 transitions. Word has length 106 [2020-07-21 14:14:43,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:43,764 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 119 transitions. [2020-07-21 14:14:43,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 14:14:43,764 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 119 transitions. [2020-07-21 14:14:43,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-21 14:14:43,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:43,766 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:43,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:43,978 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:43,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:43,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1976134303, now seen corresponding path program 6 times [2020-07-21 14:14:43,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:43,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602803092] [2020-07-21 14:14:43,980 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:44,029 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:14:44,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:44,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 14:14:44,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:44,159 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 334 proven. 60 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2020-07-21 14:14:44,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:44,314 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 214 proven. 60 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-21 14:14:44,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602803092] [2020-07-21 14:14:44,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:44,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-21 14:14:44,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781993901] [2020-07-21 14:14:44,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 14:14:44,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:44,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 14:14:44,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2020-07-21 14:14:44,318 INFO L87 Difference]: Start difference. First operand 99 states and 119 transitions. Second operand 15 states. [2020-07-21 14:14:44,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:44,815 INFO L93 Difference]: Finished difference Result 186 states and 227 transitions. [2020-07-21 14:14:44,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 14:14:44,816 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 123 [2020-07-21 14:14:44,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:44,818 INFO L225 Difference]: With dead ends: 186 [2020-07-21 14:14:44,818 INFO L226 Difference]: Without dead ends: 99 [2020-07-21 14:14:44,820 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 232 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=240, Invalid=516, Unknown=0, NotChecked=0, Total=756 [2020-07-21 14:14:44,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-21 14:14:44,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2020-07-21 14:14:44,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 14:14:44,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 107 transitions. [2020-07-21 14:14:44,836 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 107 transitions. Word has length 123 [2020-07-21 14:14:44,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:44,836 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 107 transitions. [2020-07-21 14:14:44,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 14:14:44,837 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 107 transitions. [2020-07-21 14:14:44,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-07-21 14:14:44,838 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:44,838 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:45,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:45,052 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:45,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:45,053 INFO L82 PathProgramCache]: Analyzing trace with hash -1688384554, now seen corresponding path program 7 times [2020-07-21 14:14:45,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:45,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1044096583] [2020-07-21 14:14:45,054 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:45,114 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:45,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:45,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 14:14:45,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:45,303 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 65 proven. 267 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-21 14:14:45,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:45,526 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 64 proven. 268 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-21 14:14:45,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1044096583] [2020-07-21 14:14:45,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:45,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-21 14:14:45,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750885218] [2020-07-21 14:14:45,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 14:14:45,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:45,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 14:14:45,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2020-07-21 14:14:45,529 INFO L87 Difference]: Start difference. First operand 92 states and 107 transitions. Second operand 22 states. [2020-07-21 14:14:47,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:47,128 INFO L93 Difference]: Finished difference Result 184 states and 228 transitions. [2020-07-21 14:14:47,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-07-21 14:14:47,129 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 130 [2020-07-21 14:14:47,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:47,131 INFO L225 Difference]: With dead ends: 184 [2020-07-21 14:14:47,131 INFO L226 Difference]: Without dead ends: 141 [2020-07-21 14:14:47,133 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 235 SyntacticMatches, 4 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 834 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=721, Invalid=2359, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 14:14:47,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2020-07-21 14:14:47,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 107. [2020-07-21 14:14:47,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-21 14:14:47,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 127 transitions. [2020-07-21 14:14:47,151 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 127 transitions. Word has length 130 [2020-07-21 14:14:47,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:47,151 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 127 transitions. [2020-07-21 14:14:47,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 14:14:47,152 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 127 transitions. [2020-07-21 14:14:47,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2020-07-21 14:14:47,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:47,154 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 16, 16, 16, 16, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:47,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:47,369 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:47,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:47,370 INFO L82 PathProgramCache]: Analyzing trace with hash -840848228, now seen corresponding path program 8 times [2020-07-21 14:14:47,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:47,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1735710296] [2020-07-21 14:14:47,371 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:47,425 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:14:47,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:47,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 14:14:47,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:47,583 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 551 proven. 122 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2020-07-21 14:14:47,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:47,785 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 288 proven. 201 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2020-07-21 14:14:47,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1735710296] [2020-07-21 14:14:47,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:47,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2020-07-21 14:14:47,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099398716] [2020-07-21 14:14:47,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 14:14:47,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:47,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 14:14:47,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2020-07-21 14:14:47,787 INFO L87 Difference]: Start difference. First operand 107 states and 127 transitions. Second operand 19 states. [2020-07-21 14:14:48,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:48,722 INFO L93 Difference]: Finished difference Result 206 states and 253 transitions. [2020-07-21 14:14:48,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 14:14:48,723 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 154 [2020-07-21 14:14:48,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:48,725 INFO L225 Difference]: With dead ends: 206 [2020-07-21 14:14:48,726 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 14:14:48,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 290 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=537, Invalid=1185, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 14:14:48,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 14:14:48,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2020-07-21 14:14:48,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-07-21 14:14:48,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 138 transitions. [2020-07-21 14:14:48,746 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 138 transitions. Word has length 154 [2020-07-21 14:14:48,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:48,747 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 138 transitions. [2020-07-21 14:14:48,747 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 14:14:48,747 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 138 transitions. [2020-07-21 14:14:48,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2020-07-21 14:14:48,749 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:48,749 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:48,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:48,965 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:48,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:48,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1311982393, now seen corresponding path program 9 times [2020-07-21 14:14:48,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:48,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115966039] [2020-07-21 14:14:48,967 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:49,028 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:49,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:49,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 14:14:49,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:49,165 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:49,167 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:49,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 469 proven. 33 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-21 14:14:49,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:49,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:49,480 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 83 proven. 419 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-21 14:14:49,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115966039] [2020-07-21 14:14:49,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:49,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2020-07-21 14:14:49,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660779343] [2020-07-21 14:14:49,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 14:14:49,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:49,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 14:14:49,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=355, Unknown=0, NotChecked=0, Total=506 [2020-07-21 14:14:49,482 INFO L87 Difference]: Start difference. First operand 117 states and 138 transitions. Second operand 23 states. [2020-07-21 14:14:50,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:50,371 INFO L93 Difference]: Finished difference Result 165 states and 201 transitions. [2020-07-21 14:14:50,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 14:14:50,372 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 161 [2020-07-21 14:14:50,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:50,375 INFO L225 Difference]: With dead ends: 165 [2020-07-21 14:14:50,375 INFO L226 Difference]: Without dead ends: 163 [2020-07-21 14:14:50,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 307 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=725, Invalid=1627, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 14:14:50,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-21 14:14:50,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 136. [2020-07-21 14:14:50,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 14:14:50,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 166 transitions. [2020-07-21 14:14:50,398 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 166 transitions. Word has length 161 [2020-07-21 14:14:50,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:50,399 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 166 transitions. [2020-07-21 14:14:50,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 14:14:50,399 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 166 transitions. [2020-07-21 14:14:50,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2020-07-21 14:14:50,401 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:50,402 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 22, 22, 22, 22, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:50,615 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:50,616 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:50,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:50,617 INFO L82 PathProgramCache]: Analyzing trace with hash -90659728, now seen corresponding path program 10 times [2020-07-21 14:14:50,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:50,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1396902669] [2020-07-21 14:14:50,618 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:50,693 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:50,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:50,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 14:14:50,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:51,024 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 621 proven. 517 refuted. 0 times theorem prover too weak. 747 trivial. 0 not checked. [2020-07-21 14:14:51,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:51,333 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 340 proven. 518 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2020-07-21 14:14:51,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1396902669] [2020-07-21 14:14:51,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:51,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2020-07-21 14:14:51,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815467849] [2020-07-21 14:14:51,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 14:14:51,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:51,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 14:14:51,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2020-07-21 14:14:51,337 INFO L87 Difference]: Start difference. First operand 136 states and 166 transitions. Second operand 26 states. [2020-07-21 14:14:53,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:53,421 INFO L93 Difference]: Finished difference Result 278 states and 359 transitions. [2020-07-21 14:14:53,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-21 14:14:53,422 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 196 [2020-07-21 14:14:53,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:53,424 INFO L225 Difference]: With dead ends: 278 [2020-07-21 14:14:53,424 INFO L226 Difference]: Without dead ends: 206 [2020-07-21 14:14:53,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 363 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1191 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1034, Invalid=3256, Unknown=0, NotChecked=0, Total=4290 [2020-07-21 14:14:53,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-07-21 14:14:53,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 156. [2020-07-21 14:14:53,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-21 14:14:53,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 194 transitions. [2020-07-21 14:14:53,455 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 194 transitions. Word has length 196 [2020-07-21 14:14:53,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:53,456 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 194 transitions. [2020-07-21 14:14:53,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 14:14:53,456 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 194 transitions. [2020-07-21 14:14:53,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2020-07-21 14:14:53,459 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:53,460 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 27, 26, 26, 26, 26, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:53,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:53,675 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:53,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:53,676 INFO L82 PathProgramCache]: Analyzing trace with hash -1782452330, now seen corresponding path program 11 times [2020-07-21 14:14:53,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:53,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1561231527] [2020-07-21 14:14:53,677 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:53,737 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:14:53,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:53,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 14:14:53,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:53,962 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 1508 proven. 220 refuted. 0 times theorem prover too weak. 914 trivial. 0 not checked. [2020-07-21 14:14:53,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:54,279 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 735 proven. 399 refuted. 0 times theorem prover too weak. 1508 trivial. 0 not checked. [2020-07-21 14:14:54,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1561231527] [2020-07-21 14:14:54,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:54,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2020-07-21 14:14:54,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379773625] [2020-07-21 14:14:54,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 14:14:54,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:54,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 14:14:54,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=386, Unknown=0, NotChecked=0, Total=506 [2020-07-21 14:14:54,283 INFO L87 Difference]: Start difference. First operand 156 states and 194 transitions. Second operand 23 states. [2020-07-21 14:14:55,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:55,393 INFO L93 Difference]: Finished difference Result 289 states and 381 transitions. [2020-07-21 14:14:55,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 14:14:55,393 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 230 [2020-07-21 14:14:55,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:55,396 INFO L225 Difference]: With dead ends: 289 [2020-07-21 14:14:55,396 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 14:14:55,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 438 SyntacticMatches, 3 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=658, Invalid=1598, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 14:14:55,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 14:14:55,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 190. [2020-07-21 14:14:55,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 14:14:55,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 245 transitions. [2020-07-21 14:14:55,430 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 245 transitions. Word has length 230 [2020-07-21 14:14:55,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:55,431 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 245 transitions. [2020-07-21 14:14:55,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 14:14:55,431 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 245 transitions. [2020-07-21 14:14:55,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 14:14:55,433 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:55,434 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:55,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:55,639 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:55,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:55,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1051553665, now seen corresponding path program 12 times [2020-07-21 14:14:55,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:55,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176142891] [2020-07-21 14:14:55,641 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:55,723 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:55,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:55,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 14:14:55,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:55,957 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 898 proven. 634 refuted. 0 times theorem prover too weak. 1302 trivial. 0 not checked. [2020-07-21 14:14:55,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:56,246 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 467 proven. 635 refuted. 0 times theorem prover too weak. 1732 trivial. 0 not checked. [2020-07-21 14:14:56,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176142891] [2020-07-21 14:14:56,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:56,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-07-21 14:14:56,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189460714] [2020-07-21 14:14:56,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 14:14:56,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:56,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 14:14:56,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2020-07-21 14:14:56,249 INFO L87 Difference]: Start difference. First operand 190 states and 245 transitions. Second operand 21 states. [2020-07-21 14:14:57,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:57,905 INFO L93 Difference]: Finished difference Result 447 states and 593 transitions. [2020-07-21 14:14:57,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 14:14:57,906 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 237 [2020-07-21 14:14:57,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:57,909 INFO L225 Difference]: With dead ends: 447 [2020-07-21 14:14:57,910 INFO L226 Difference]: Without dead ends: 351 [2020-07-21 14:14:57,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 449 SyntacticMatches, 5 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1151 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=850, Invalid=2932, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 14:14:57,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-21 14:14:57,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 254. [2020-07-21 14:14:57,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 14:14:57,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 328 transitions. [2020-07-21 14:14:57,983 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 328 transitions. Word has length 237 [2020-07-21 14:14:57,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:57,986 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 328 transitions. [2020-07-21 14:14:57,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 14:14:57,987 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 328 transitions. [2020-07-21 14:14:57,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2020-07-21 14:14:57,990 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:57,990 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 31, 30, 30, 30, 30, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:58,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:58,204 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:58,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:58,205 INFO L82 PathProgramCache]: Analyzing trace with hash 1090659833, now seen corresponding path program 13 times [2020-07-21 14:14:58,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:58,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481311631] [2020-07-21 14:14:58,206 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:58,281 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:14:58,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:58,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 14:14:58,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:58,460 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1861 proven. 224 refuted. 0 times theorem prover too weak. 1421 trivial. 0 not checked. [2020-07-21 14:14:58,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:58,707 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1123 proven. 224 refuted. 0 times theorem prover too weak. 2159 trivial. 0 not checked. [2020-07-21 14:14:58,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481311631] [2020-07-21 14:14:58,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:58,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-21 14:14:58,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231485978] [2020-07-21 14:14:58,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 14:14:58,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:58,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 14:14:58,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=228, Unknown=0, NotChecked=0, Total=306 [2020-07-21 14:14:58,710 INFO L87 Difference]: Start difference. First operand 254 states and 328 transitions. Second operand 18 states. [2020-07-21 14:14:59,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:59,476 INFO L93 Difference]: Finished difference Result 363 states and 475 transitions. [2020-07-21 14:14:59,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 14:14:59,477 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 261 [2020-07-21 14:14:59,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:59,479 INFO L225 Difference]: With dead ends: 363 [2020-07-21 14:14:59,480 INFO L226 Difference]: Without dead ends: 206 [2020-07-21 14:14:59,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 505 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=429, Invalid=977, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 14:14:59,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-07-21 14:14:59,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 206. [2020-07-21 14:14:59,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 14:14:59,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 263 transitions. [2020-07-21 14:14:59,520 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 263 transitions. Word has length 261 [2020-07-21 14:14:59,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:59,521 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 263 transitions. [2020-07-21 14:14:59,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 14:14:59,521 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 263 transitions. [2020-07-21 14:14:59,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2020-07-21 14:14:59,523 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:59,524 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:59,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:59,737 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:59,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:59,737 INFO L82 PathProgramCache]: Analyzing trace with hash -431748828, now seen corresponding path program 14 times [2020-07-21 14:14:59,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:59,738 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1802430719] [2020-07-21 14:14:59,738 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:59,833 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:59,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:59,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 14:14:59,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:00,125 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 909 proven. 1045 refuted. 0 times theorem prover too weak. 1773 trivial. 0 not checked. [2020-07-21 14:15:00,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:00,522 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 484 proven. 1046 refuted. 0 times theorem prover too weak. 2197 trivial. 0 not checked. [2020-07-21 14:15:00,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1802430719] [2020-07-21 14:15:00,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:00,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 25 [2020-07-21 14:15:00,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349574561] [2020-07-21 14:15:00,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 14:15:00,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:00,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 14:15:00,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2020-07-21 14:15:00,531 INFO L87 Difference]: Start difference. First operand 206 states and 263 transitions. Second operand 25 states. [2020-07-21 14:15:03,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:03,538 INFO L93 Difference]: Finished difference Result 364 states and 481 transitions. [2020-07-21 14:15:03,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-07-21 14:15:03,539 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 268 [2020-07-21 14:15:03,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:03,542 INFO L225 Difference]: With dead ends: 364 [2020-07-21 14:15:03,542 INFO L226 Difference]: Without dead ends: 258 [2020-07-21 14:15:03,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 507 SyntacticMatches, 5 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1434, Invalid=5046, Unknown=0, NotChecked=0, Total=6480 [2020-07-21 14:15:03,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-21 14:15:03,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 224. [2020-07-21 14:15:03,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 14:15:03,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 287 transitions. [2020-07-21 14:15:03,605 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 287 transitions. Word has length 268 [2020-07-21 14:15:03,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:03,606 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 287 transitions. [2020-07-21 14:15:03,606 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 14:15:03,606 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 287 transitions. [2020-07-21 14:15:03,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 14:15:03,612 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:03,612 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:03,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:03,826 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:03,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:03,826 INFO L82 PathProgramCache]: Analyzing trace with hash -935543841, now seen corresponding path program 15 times [2020-07-21 14:15:03,826 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:03,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2070739190] [2020-07-21 14:15:03,827 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:03,907 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:15:03,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:03,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 14:15:03,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:04,178 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 2489 proven. 351 refuted. 0 times theorem prover too weak. 1903 trivial. 0 not checked. [2020-07-21 14:15:04,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:04,542 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 1293 proven. 629 refuted. 0 times theorem prover too weak. 2821 trivial. 0 not checked. [2020-07-21 14:15:04,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2070739190] [2020-07-21 14:15:04,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:04,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-21 14:15:04,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162723748] [2020-07-21 14:15:04,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 14:15:04,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:04,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 14:15:04,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2020-07-21 14:15:04,545 INFO L87 Difference]: Start difference. First operand 224 states and 287 transitions. Second operand 22 states. [2020-07-21 14:15:06,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:06,031 INFO L93 Difference]: Finished difference Result 320 states and 417 transitions. [2020-07-21 14:15:06,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-21 14:15:06,035 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 299 [2020-07-21 14:15:06,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:06,039 INFO L225 Difference]: With dead ends: 320 [2020-07-21 14:15:06,039 INFO L226 Difference]: Without dead ends: 224 [2020-07-21 14:15:06,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 577 SyntacticMatches, 4 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=837, Invalid=2025, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 14:15:06,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-21 14:15:06,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 193. [2020-07-21 14:15:06,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2020-07-21 14:15:06,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 238 transitions. [2020-07-21 14:15:06,085 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 238 transitions. Word has length 299 [2020-07-21 14:15:06,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:06,086 INFO L479 AbstractCegarLoop]: Abstraction has 193 states and 238 transitions. [2020-07-21 14:15:06,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 14:15:06,087 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 238 transitions. [2020-07-21 14:15:06,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2020-07-21 14:15:06,090 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:06,090 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 37, 36, 36, 36, 36, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:06,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:06,305 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:06,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:06,306 INFO L82 PathProgramCache]: Analyzing trace with hash 221652094, now seen corresponding path program 16 times [2020-07-21 14:15:06,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:06,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1770796820] [2020-07-21 14:15:06,307 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:06,461 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:06,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:06,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 14:15:06,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:06,974 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 875 proven. 1633 refuted. 0 times theorem prover too weak. 2492 trivial. 0 not checked. [2020-07-21 14:15:06,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:07,536 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 484 proven. 1634 refuted. 0 times theorem prover too weak. 2882 trivial. 0 not checked. [2020-07-21 14:15:07,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1770796820] [2020-07-21 14:15:07,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:07,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 29 [2020-07-21 14:15:07,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843372998] [2020-07-21 14:15:07,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 14:15:07,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:07,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 14:15:07,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=658, Unknown=0, NotChecked=0, Total=812 [2020-07-21 14:15:07,543 INFO L87 Difference]: Start difference. First operand 193 states and 238 transitions. Second operand 29 states. [2020-07-21 14:15:11,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:11,257 INFO L93 Difference]: Finished difference Result 343 states and 444 transitions. [2020-07-21 14:15:11,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2020-07-21 14:15:11,258 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 306 [2020-07-21 14:15:11,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:11,260 INFO L225 Difference]: With dead ends: 343 [2020-07-21 14:15:11,260 INFO L226 Difference]: Without dead ends: 265 [2020-07-21 14:15:11,264 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 579 SyntacticMatches, 5 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2751 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1903, Invalid=6653, Unknown=0, NotChecked=0, Total=8556 [2020-07-21 14:15:11,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2020-07-21 14:15:11,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 214. [2020-07-21 14:15:11,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2020-07-21 14:15:11,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 266 transitions. [2020-07-21 14:15:11,306 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 266 transitions. Word has length 306 [2020-07-21 14:15:11,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:11,307 INFO L479 AbstractCegarLoop]: Abstraction has 214 states and 266 transitions. [2020-07-21 14:15:11,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 14:15:11,307 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 266 transitions. [2020-07-21 14:15:11,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2020-07-21 14:15:11,310 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:11,310 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:11,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:11,524 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:11,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:11,525 INFO L82 PathProgramCache]: Analyzing trace with hash 856878168, now seen corresponding path program 17 times [2020-07-21 14:15:11,526 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:11,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709474393] [2020-07-21 14:15:11,527 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:11,622 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:15:11,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:11,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 14:15:11,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:12,002 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 3316 proven. 523 refuted. 0 times theorem prover too weak. 2622 trivial. 0 not checked. [2020-07-21 14:15:12,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:12,474 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 1566 proven. 1139 refuted. 0 times theorem prover too weak. 3756 trivial. 0 not checked. [2020-07-21 14:15:12,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709474393] [2020-07-21 14:15:12,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:12,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2020-07-21 14:15:12,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014577262] [2020-07-21 14:15:12,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 14:15:12,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:12,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 14:15:12,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=500, Unknown=0, NotChecked=0, Total=650 [2020-07-21 14:15:12,477 INFO L87 Difference]: Start difference. First operand 214 states and 266 transitions. Second operand 26 states. [2020-07-21 14:15:14,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:14,607 INFO L93 Difference]: Finished difference Result 416 states and 539 transitions. [2020-07-21 14:15:14,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 14:15:14,609 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 344 [2020-07-21 14:15:14,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:14,611 INFO L225 Difference]: With dead ends: 416 [2020-07-21 14:15:14,612 INFO L226 Difference]: Without dead ends: 262 [2020-07-21 14:15:14,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 663 SyntacticMatches, 4 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1082 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1502, Invalid=3610, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 14:15:14,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-21 14:15:14,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 248. [2020-07-21 14:15:14,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-21 14:15:14,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 315 transitions. [2020-07-21 14:15:14,664 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 315 transitions. Word has length 344 [2020-07-21 14:15:14,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:14,665 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 315 transitions. [2020-07-21 14:15:14,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 14:15:14,666 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 315 transitions. [2020-07-21 14:15:14,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-21 14:15:14,669 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:14,669 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 43, 42, 42, 42, 42, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:14,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:14,884 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:14,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:14,884 INFO L82 PathProgramCache]: Analyzing trace with hash 930621925, now seen corresponding path program 18 times [2020-07-21 14:15:14,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:14,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581249450] [2020-07-21 14:15:14,885 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:15,013 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:15,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:15,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 14:15:15,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:15,490 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 775 proven. 2452 refuted. 0 times theorem prover too weak. 3534 trivial. 0 not checked. [2020-07-21 14:15:15,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:16,128 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 458 proven. 2453 refuted. 0 times theorem prover too weak. 3850 trivial. 0 not checked. [2020-07-21 14:15:16,128 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581249450] [2020-07-21 14:15:16,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:16,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 33 [2020-07-21 14:15:16,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34557327] [2020-07-21 14:15:16,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 14:15:16,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:16,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 14:15:16,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=861, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 14:15:16,131 INFO L87 Difference]: Start difference. First operand 248 states and 315 transitions. Second operand 33 states. [2020-07-21 14:15:20,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:20,932 INFO L93 Difference]: Finished difference Result 453 states and 590 transitions. [2020-07-21 14:15:20,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-07-21 14:15:20,933 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 351 [2020-07-21 14:15:20,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:20,935 INFO L225 Difference]: With dead ends: 453 [2020-07-21 14:15:20,936 INFO L226 Difference]: Without dead ends: 331 [2020-07-21 14:15:20,940 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 775 GetRequests, 665 SyntacticMatches, 5 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3651 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2557, Invalid=8785, Unknown=0, NotChecked=0, Total=11342 [2020-07-21 14:15:20,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2020-07-21 14:15:21,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 274. [2020-07-21 14:15:21,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-07-21 14:15:21,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 351 transitions. [2020-07-21 14:15:21,014 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 351 transitions. Word has length 351 [2020-07-21 14:15:21,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:21,015 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 351 transitions. [2020-07-21 14:15:21,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 14:15:21,015 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 351 transitions. [2020-07-21 14:15:21,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 400 [2020-07-21 14:15:21,020 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:21,021 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 49, 48, 48, 48, 48, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:21,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:21,237 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:21,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:21,238 INFO L82 PathProgramCache]: Analyzing trace with hash 1703194347, now seen corresponding path program 19 times [2020-07-21 14:15:21,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:21,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [749271145] [2020-07-21 14:15:21,239 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:21,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:15:21,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:21,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 14:15:21,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:21,868 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 4410 proven. 749 refuted. 0 times theorem prover too weak. 3654 trivial. 0 not checked. [2020-07-21 14:15:21,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:22,523 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 2010 proven. 1763 refuted. 0 times theorem prover too weak. 5040 trivial. 0 not checked. [2020-07-21 14:15:22,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [749271145] [2020-07-21 14:15:22,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:22,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 30 [2020-07-21 14:15:22,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142528676] [2020-07-21 14:15:22,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 14:15:22,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:22,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 14:15:22,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=675, Unknown=0, NotChecked=0, Total=870 [2020-07-21 14:15:22,527 INFO L87 Difference]: Start difference. First operand 274 states and 351 transitions. Second operand 30 states. [2020-07-21 14:15:24,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:24,990 INFO L93 Difference]: Finished difference Result 444 states and 588 transitions. [2020-07-21 14:15:24,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-21 14:15:24,995 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 399 [2020-07-21 14:15:24,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:24,998 INFO L225 Difference]: With dead ends: 444 [2020-07-21 14:15:24,998 INFO L226 Difference]: Without dead ends: 321 [2020-07-21 14:15:25,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 769 SyntacticMatches, 4 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1255 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1660, Invalid=4192, Unknown=0, NotChecked=0, Total=5852 [2020-07-21 14:15:25,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-21 14:15:25,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 308. [2020-07-21 14:15:25,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 308 states. [2020-07-21 14:15:25,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 400 transitions. [2020-07-21 14:15:25,072 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 400 transitions. Word has length 399 [2020-07-21 14:15:25,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:25,074 INFO L479 AbstractCegarLoop]: Abstraction has 308 states and 400 transitions. [2020-07-21 14:15:25,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 14:15:25,075 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 400 transitions. [2020-07-21 14:15:25,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2020-07-21 14:15:25,078 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:25,078 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:25,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:25,293 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:25,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:25,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1852909686, now seen corresponding path program 20 times [2020-07-21 14:15:25,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:25,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1717281803] [2020-07-21 14:15:25,295 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:25,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:25,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:25,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 729 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 14:15:25,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:25,775 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 1480 proven. 2573 refuted. 0 times theorem prover too weak. 5110 trivial. 0 not checked. [2020-07-21 14:15:25,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:26,325 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 767 proven. 2574 refuted. 0 times theorem prover too weak. 5822 trivial. 0 not checked. [2020-07-21 14:15:26,326 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1717281803] [2020-07-21 14:15:26,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:26,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2020-07-21 14:15:26,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436810085] [2020-07-21 14:15:26,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 14:15:26,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:26,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 14:15:26,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2020-07-21 14:15:26,328 INFO L87 Difference]: Start difference. First operand 308 states and 400 transitions. Second operand 24 states. [2020-07-21 14:15:28,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:28,990 INFO L93 Difference]: Finished difference Result 708 states and 943 transitions. [2020-07-21 14:15:28,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-21 14:15:28,991 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 406 [2020-07-21 14:15:28,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:28,994 INFO L225 Difference]: With dead ends: 708 [2020-07-21 14:15:28,994 INFO L226 Difference]: Without dead ends: 575 [2020-07-21 14:15:28,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 868 GetRequests, 783 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2182 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1394, Invalid=5086, Unknown=0, NotChecked=0, Total=6480 [2020-07-21 14:15:28,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2020-07-21 14:15:29,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 408. [2020-07-21 14:15:29,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-21 14:15:29,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 530 transitions. [2020-07-21 14:15:29,092 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 530 transitions. Word has length 406 [2020-07-21 14:15:29,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:29,093 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 530 transitions. [2020-07-21 14:15:29,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 14:15:29,093 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 530 transitions. [2020-07-21 14:15:29,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-21 14:15:29,097 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:29,098 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 53, 53, 53, 53, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:29,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:29,313 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:29,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:29,314 INFO L82 PathProgramCache]: Analyzing trace with hash 1246863545, now seen corresponding path program 21 times [2020-07-21 14:15:29,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:29,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1057697957] [2020-07-21 14:15:29,315 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:29,410 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:15:29,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:29,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 14:15:29,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:29,719 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 4950 proven. 605 refuted. 0 times theorem prover too weak. 5168 trivial. 0 not checked. [2020-07-21 14:15:29,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:30,355 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 3384 proven. 605 refuted. 0 times theorem prover too weak. 6734 trivial. 0 not checked. [2020-07-21 14:15:30,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1057697957] [2020-07-21 14:15:30,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:30,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-07-21 14:15:30,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374395602] [2020-07-21 14:15:30,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 14:15:30,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:30,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 14:15:30,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2020-07-21 14:15:30,362 INFO L87 Difference]: Start difference. First operand 408 states and 530 transitions. Second operand 21 states. [2020-07-21 14:15:31,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:31,789 INFO L93 Difference]: Finished difference Result 557 states and 733 transitions. [2020-07-21 14:15:31,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 14:15:31,790 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 437 [2020-07-21 14:15:31,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:31,793 INFO L225 Difference]: With dead ends: 557 [2020-07-21 14:15:31,793 INFO L226 Difference]: Without dead ends: 327 [2020-07-21 14:15:31,795 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 905 GetRequests, 854 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=675, Invalid=1581, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 14:15:31,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2020-07-21 14:15:31,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2020-07-21 14:15:31,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2020-07-21 14:15:31,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 422 transitions. [2020-07-21 14:15:31,866 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 422 transitions. Word has length 437 [2020-07-21 14:15:31,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:31,866 INFO L479 AbstractCegarLoop]: Abstraction has 327 states and 422 transitions. [2020-07-21 14:15:31,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 14:15:31,867 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 422 transitions. [2020-07-21 14:15:31,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2020-07-21 14:15:31,872 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:31,872 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 55, 54, 54, 54, 54, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:32,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:32,088 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:32,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:32,089 INFO L82 PathProgramCache]: Analyzing trace with hash -833030556, now seen corresponding path program 22 times [2020-07-21 14:15:32,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:32,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964846333] [2020-07-21 14:15:32,090 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:32,225 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:32,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:32,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 14:15:32,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:32,692 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 1317 proven. 3531 refuted. 0 times theorem prover too weak. 6261 trivial. 0 not checked. [2020-07-21 14:15:32,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:33,348 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 710 proven. 3532 refuted. 0 times theorem prover too weak. 6867 trivial. 0 not checked. [2020-07-21 14:15:33,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964846333] [2020-07-21 14:15:33,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:33,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 28 [2020-07-21 14:15:33,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607702698] [2020-07-21 14:15:33,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 14:15:33,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:33,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 14:15:33,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2020-07-21 14:15:33,350 INFO L87 Difference]: Start difference. First operand 327 states and 422 transitions. Second operand 28 states. [2020-07-21 14:15:38,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:38,212 INFO L93 Difference]: Finished difference Result 545 states and 722 transitions. [2020-07-21 14:15:38,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-21 14:15:38,213 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 444 [2020-07-21 14:15:38,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:38,216 INFO L225 Difference]: With dead ends: 545 [2020-07-21 14:15:38,216 INFO L226 Difference]: Without dead ends: 402 [2020-07-21 14:15:38,218 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 970 GetRequests, 855 SyntacticMatches, 6 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4405 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2533, Invalid=9677, Unknown=0, NotChecked=0, Total=12210 [2020-07-21 14:15:38,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-21 14:15:38,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 348. [2020-07-21 14:15:38,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 14:15:38,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 450 transitions. [2020-07-21 14:15:38,295 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 450 transitions. Word has length 444 [2020-07-21 14:15:38,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:38,296 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 450 transitions. [2020-07-21 14:15:38,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 14:15:38,296 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 450 transitions. [2020-07-21 14:15:38,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-21 14:15:38,301 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:38,301 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 60, 59, 59, 59, 59, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:38,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:38,516 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:38,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:38,516 INFO L82 PathProgramCache]: Analyzing trace with hash 1802445246, now seen corresponding path program 23 times [2020-07-21 14:15:38,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:38,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1183372785] [2020-07-21 14:15:38,517 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:38,627 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:15:38,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:38,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 14:15:38,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:39,049 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 6090 proven. 834 refuted. 0 times theorem prover too weak. 6319 trivial. 0 not checked. [2020-07-21 14:15:39,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:39,811 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 3585 proven. 1557 refuted. 0 times theorem prover too weak. 8101 trivial. 0 not checked. [2020-07-21 14:15:39,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1183372785] [2020-07-21 14:15:39,812 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:39,812 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 25 [2020-07-21 14:15:39,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215981153] [2020-07-21 14:15:39,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 14:15:39,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:39,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 14:15:39,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=459, Unknown=0, NotChecked=0, Total=600 [2020-07-21 14:15:39,814 INFO L87 Difference]: Start difference. First operand 348 states and 450 transitions. Second operand 25 states. [2020-07-21 14:15:41,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:41,846 INFO L93 Difference]: Finished difference Result 481 states and 632 transitions. [2020-07-21 14:15:41,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-21 14:15:41,847 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 482 [2020-07-21 14:15:41,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:41,849 INFO L225 Difference]: With dead ends: 481 [2020-07-21 14:15:41,849 INFO L226 Difference]: Without dead ends: 348 [2020-07-21 14:15:41,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1010 GetRequests, 940 SyntacticMatches, 5 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 902 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1270, Invalid=3152, Unknown=0, NotChecked=0, Total=4422 [2020-07-21 14:15:41,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-07-21 14:15:41,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 348. [2020-07-21 14:15:41,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 14:15:41,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 448 transitions. [2020-07-21 14:15:41,931 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 448 transitions. Word has length 482 [2020-07-21 14:15:41,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:41,932 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 448 transitions. [2020-07-21 14:15:41,932 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 14:15:41,932 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 448 transitions. [2020-07-21 14:15:41,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 14:15:41,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:41,938 INFO L422 BasicCegarLoop]: trace histogram [61, 61, 61, 60, 60, 60, 60, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:42,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:42,150 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:42,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:42,151 INFO L82 PathProgramCache]: Analyzing trace with hash 564016575, now seen corresponding path program 24 times [2020-07-21 14:15:42,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:42,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1249213313] [2020-07-21 14:15:42,152 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:42,330 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:42,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:42,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 14:15:42,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:42,872 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 1082 proven. 4783 refuted. 0 times theorem prover too weak. 7807 trivial. 0 not checked. [2020-07-21 14:15:42,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:43,718 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 622 proven. 4783 refuted. 0 times theorem prover too weak. 8267 trivial. 0 not checked. [2020-07-21 14:15:43,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1249213313] [2020-07-21 14:15:43,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:43,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 30 [2020-07-21 14:15:43,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565275325] [2020-07-21 14:15:43,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 14:15:43,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:43,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 14:15:43,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=691, Unknown=0, NotChecked=0, Total=870 [2020-07-21 14:15:43,721 INFO L87 Difference]: Start difference. First operand 348 states and 448 transitions. Second operand 30 states. [2020-07-21 14:15:49,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:49,498 INFO L93 Difference]: Finished difference Result 552 states and 727 transitions. [2020-07-21 14:15:49,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2020-07-21 14:15:49,499 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 489 [2020-07-21 14:15:49,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:49,502 INFO L225 Difference]: With dead ends: 552 [2020-07-21 14:15:49,502 INFO L226 Difference]: Without dead ends: 406 [2020-07-21 14:15:49,506 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1069 GetRequests, 943 SyntacticMatches, 6 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5393 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3316, Invalid=11446, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 14:15:49,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2020-07-21 14:15:49,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 372. [2020-07-21 14:15:49,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-07-21 14:15:49,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 480 transitions. [2020-07-21 14:15:49,602 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 480 transitions. Word has length 489 [2020-07-21 14:15:49,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:49,603 INFO L479 AbstractCegarLoop]: Abstraction has 372 states and 480 transitions. [2020-07-21 14:15:49,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 14:15:49,603 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 480 transitions. [2020-07-21 14:15:49,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 535 [2020-07-21 14:15:49,609 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:49,610 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 67, 66, 66, 66, 66, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:49,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:49,826 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:49,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:49,827 INFO L82 PathProgramCache]: Analyzing trace with hash 869445188, now seen corresponding path program 25 times [2020-07-21 14:15:49,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:49,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [62804330] [2020-07-21 14:15:49,828 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:49,945 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:15:49,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:49,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 616 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 14:15:49,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:50,489 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 7531 proven. 1117 refuted. 0 times theorem prover too weak. 7854 trivial. 0 not checked. [2020-07-21 14:15:50,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:51,326 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 3921 proven. 2693 refuted. 0 times theorem prover too weak. 9888 trivial. 0 not checked. [2020-07-21 14:15:51,326 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [62804330] [2020-07-21 14:15:51,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:51,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 29 [2020-07-21 14:15:51,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528486133] [2020-07-21 14:15:51,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 14:15:51,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:51,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 14:15:51,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=628, Unknown=0, NotChecked=0, Total=812 [2020-07-21 14:15:51,328 INFO L87 Difference]: Start difference. First operand 372 states and 480 transitions. Second operand 29 states. [2020-07-21 14:15:54,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:54,478 INFO L93 Difference]: Finished difference Result 505 states and 661 transitions. [2020-07-21 14:15:54,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-21 14:15:54,479 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 534 [2020-07-21 14:15:54,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:54,483 INFO L225 Difference]: With dead ends: 505 [2020-07-21 14:15:54,483 INFO L226 Difference]: Without dead ends: 372 [2020-07-21 14:15:54,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1130 GetRequests, 1040 SyntacticMatches, 5 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1697 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2104, Invalid=5378, Unknown=0, NotChecked=0, Total=7482 [2020-07-21 14:15:54,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2020-07-21 14:15:54,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 341. [2020-07-21 14:15:54,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-21 14:15:54,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 433 transitions. [2020-07-21 14:15:54,561 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 433 transitions. Word has length 534 [2020-07-21 14:15:54,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:54,561 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 433 transitions. [2020-07-21 14:15:54,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 14:15:54,562 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 433 transitions. [2020-07-21 14:15:54,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 542 [2020-07-21 14:15:54,568 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:54,568 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 68, 67, 67, 67, 67, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:54,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:54,782 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:54,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:54,783 INFO L82 PathProgramCache]: Analyzing trace with hash 943892089, now seen corresponding path program 26 times [2020-07-21 14:15:54,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:54,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1552542589] [2020-07-21 14:15:54,784 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:54,960 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:54,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:54,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 14:15:54,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:55,608 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 766 proven. 6380 refuted. 0 times theorem prover too weak. 9835 trivial. 0 not checked. [2020-07-21 14:15:55,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:56,535 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 504 proven. 6380 refuted. 0 times theorem prover too weak. 10097 trivial. 0 not checked. [2020-07-21 14:15:56,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1552542589] [2020-07-21 14:15:56,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:56,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 34 [2020-07-21 14:15:56,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6094001] [2020-07-21 14:15:56,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 14:15:56,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:56,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 14:15:56,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 14:15:56,538 INFO L87 Difference]: Start difference. First operand 341 states and 433 transitions. Second operand 34 states. [2020-07-21 14:16:03,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:03,714 INFO L93 Difference]: Finished difference Result 520 states and 674 transitions. [2020-07-21 14:16:03,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2020-07-21 14:16:03,716 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 541 [2020-07-21 14:16:03,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:03,719 INFO L225 Difference]: With dead ends: 520 [2020-07-21 14:16:03,719 INFO L226 Difference]: Without dead ends: 402 [2020-07-21 14:16:03,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1182 GetRequests, 1043 SyntacticMatches, 6 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6579 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=3980, Invalid=14110, Unknown=0, NotChecked=0, Total=18090 [2020-07-21 14:16:03,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-21 14:16:03,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 368. [2020-07-21 14:16:03,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 14:16:03,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 469 transitions. [2020-07-21 14:16:03,811 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 469 transitions. Word has length 541 [2020-07-21 14:16:03,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:03,812 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 469 transitions. [2020-07-21 14:16:03,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 14:16:03,812 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 469 transitions. [2020-07-21 14:16:03,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 594 [2020-07-21 14:16:03,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:03,820 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 75, 74, 74, 74, 74, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:04,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:04,036 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:04,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:04,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1328811571, now seen corresponding path program 27 times [2020-07-21 14:16:04,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:04,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [923861602] [2020-07-21 14:16:04,038 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:04,172 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:16:04,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:04,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 682 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 14:16:04,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:05,050 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 9327 proven. 1463 refuted. 0 times theorem prover too weak. 9860 trivial. 0 not checked. [2020-07-21 14:16:05,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:06,121 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 4446 proven. 4022 refuted. 0 times theorem prover too weak. 12182 trivial. 0 not checked. [2020-07-21 14:16:06,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [923861602] [2020-07-21 14:16:06,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:06,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 33 [2020-07-21 14:16:06,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116007282] [2020-07-21 14:16:06,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 14:16:06,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:06,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 14:16:06,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=823, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 14:16:06,124 INFO L87 Difference]: Start difference. First operand 368 states and 469 transitions. Second operand 33 states. [2020-07-21 14:16:11,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:11,170 INFO L93 Difference]: Finished difference Result 649 states and 846 transitions. [2020-07-21 14:16:11,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-21 14:16:11,177 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 593 [2020-07-21 14:16:11,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:11,180 INFO L225 Difference]: With dead ends: 649 [2020-07-21 14:16:11,181 INFO L226 Difference]: Without dead ends: 410 [2020-07-21 14:16:11,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1265 GetRequests, 1154 SyntacticMatches, 5 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2783 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3271, Invalid=8285, Unknown=0, NotChecked=0, Total=11556 [2020-07-21 14:16:11,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2020-07-21 14:16:11,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 402. [2020-07-21 14:16:11,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 402 states. [2020-07-21 14:16:11,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 516 transitions. [2020-07-21 14:16:11,278 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 516 transitions. Word has length 593 [2020-07-21 14:16:11,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:11,279 INFO L479 AbstractCegarLoop]: Abstraction has 402 states and 516 transitions. [2020-07-21 14:16:11,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 14:16:11,280 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 516 transitions. [2020-07-21 14:16:11,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 601 [2020-07-21 14:16:11,286 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:11,286 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 76, 75, 75, 75, 75, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:11,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:11,501 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:11,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:11,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1218530218, now seen corresponding path program 28 times [2020-07-21 14:16:11,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:11,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [969868081] [2020-07-21 14:16:11,503 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:11,689 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:11,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:11,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 1065 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 14:16:11,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:12,511 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 342 proven. 8400 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-21 14:16:12,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:13,650 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 342 proven. 8400 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-21 14:16:13,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [969868081] [2020-07-21 14:16:13,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:13,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 38 [2020-07-21 14:16:13,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112753511] [2020-07-21 14:16:13,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 14:16:13,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:13,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 14:16:13,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=1133, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 14:16:13,652 INFO L87 Difference]: Start difference. First operand 402 states and 516 transitions. Second operand 38 states. [2020-07-21 14:16:23,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:23,107 INFO L93 Difference]: Finished difference Result 702 states and 919 transitions. [2020-07-21 14:16:23,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2020-07-21 14:16:23,111 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 600 [2020-07-21 14:16:23,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:23,115 INFO L225 Difference]: With dead ends: 702 [2020-07-21 14:16:23,115 INFO L226 Difference]: Without dead ends: 527 [2020-07-21 14:16:23,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1313 GetRequests, 1157 SyntacticMatches, 6 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8485 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=5519, Invalid=17433, Unknown=0, NotChecked=0, Total=22952 [2020-07-21 14:16:23,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2020-07-21 14:16:23,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 434. [2020-07-21 14:16:23,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 434 states. [2020-07-21 14:16:23,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 560 transitions. [2020-07-21 14:16:23,210 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 560 transitions. Word has length 600 [2020-07-21 14:16:23,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:23,210 INFO L479 AbstractCegarLoop]: Abstraction has 434 states and 560 transitions. [2020-07-21 14:16:23,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 14:16:23,211 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 560 transitions. [2020-07-21 14:16:23,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 663 [2020-07-21 14:16:23,218 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:23,218 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 84, 83, 83, 83, 83, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:23,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:23,433 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:23,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:23,433 INFO L82 PathProgramCache]: Analyzing trace with hash -955730672, now seen corresponding path program 29 times [2020-07-21 14:16:23,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:23,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1948267482] [2020-07-21 14:16:23,434 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:23,578 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:16:23,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:23,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 758 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 14:16:23,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:24,630 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 11572 proven. 1881 refuted. 0 times theorem prover too weak. 12437 trivial. 0 not checked. [2020-07-21 14:16:24,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:26,065 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 5254 proven. 5553 refuted. 0 times theorem prover too weak. 15083 trivial. 0 not checked. [2020-07-21 14:16:26,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1948267482] [2020-07-21 14:16:26,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:26,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 37 [2020-07-21 14:16:26,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039183979] [2020-07-21 14:16:26,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 14:16:26,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:26,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 14:16:26,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=1044, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 14:16:26,069 INFO L87 Difference]: Start difference. First operand 434 states and 560 transitions. Second operand 37 states. [2020-07-21 14:16:31,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:31,484 INFO L93 Difference]: Finished difference Result 642 states and 845 transitions. [2020-07-21 14:16:31,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-21 14:16:31,486 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 662 [2020-07-21 14:16:31,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:31,490 INFO L225 Difference]: With dead ends: 642 [2020-07-21 14:16:31,490 INFO L226 Difference]: Without dead ends: 476 [2020-07-21 14:16:31,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1404 GetRequests, 1288 SyntacticMatches, 5 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3033 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3542, Invalid=9114, Unknown=0, NotChecked=0, Total=12656 [2020-07-21 14:16:31,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2020-07-21 14:16:31,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 468. [2020-07-21 14:16:31,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 468 states. [2020-07-21 14:16:31,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 607 transitions. [2020-07-21 14:16:31,597 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 607 transitions. Word has length 662 [2020-07-21 14:16:31,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:31,598 INFO L479 AbstractCegarLoop]: Abstraction has 468 states and 607 transitions. [2020-07-21 14:16:31,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 14:16:31,598 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 607 transitions. [2020-07-21 14:16:31,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 670 [2020-07-21 14:16:31,603 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:31,604 INFO L422 BasicCegarLoop]: trace histogram [85, 85, 85, 84, 84, 84, 84, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:31,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:31,817 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:31,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:31,818 INFO L82 PathProgramCache]: Analyzing trace with hash 2116259269, now seen corresponding path program 30 times [2020-07-21 14:16:31,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:31,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028863468] [2020-07-21 14:16:31,819 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:32,014 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:32,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:32,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 1185 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 14:16:32,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:32,684 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 2043 proven. 8366 refuted. 0 times theorem prover too weak. 16081 trivial. 0 not checked. [2020-07-21 14:16:32,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:33,751 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 1077 proven. 8366 refuted. 0 times theorem prover too weak. 17047 trivial. 0 not checked. [2020-07-21 14:16:33,752 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2028863468] [2020-07-21 14:16:33,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:33,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 25 [2020-07-21 14:16:33,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139906683] [2020-07-21 14:16:33,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 14:16:33,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:33,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 14:16:33,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=460, Unknown=0, NotChecked=0, Total=600 [2020-07-21 14:16:33,754 INFO L87 Difference]: Start difference. First operand 468 states and 607 transitions. Second operand 25 states. [2020-07-21 14:16:38,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:38,218 INFO L93 Difference]: Finished difference Result 1029 states and 1363 transitions. [2020-07-21 14:16:38,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-07-21 14:16:38,220 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 669 [2020-07-21 14:16:38,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:38,225 INFO L225 Difference]: With dead ends: 1029 [2020-07-21 14:16:38,226 INFO L226 Difference]: Without dead ends: 859 [2020-07-21 14:16:38,227 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1409 GetRequests, 1307 SyntacticMatches, 7 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3368 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2002, Invalid=7310, Unknown=0, NotChecked=0, Total=9312 [2020-07-21 14:16:38,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 859 states. [2020-07-21 14:16:38,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 859 to 613. [2020-07-21 14:16:38,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 613 states. [2020-07-21 14:16:38,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 613 states to 613 states and 796 transitions. [2020-07-21 14:16:38,336 INFO L78 Accepts]: Start accepts. Automaton has 613 states and 796 transitions. Word has length 669 [2020-07-21 14:16:38,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:38,337 INFO L479 AbstractCegarLoop]: Abstraction has 613 states and 796 transitions. [2020-07-21 14:16:38,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 14:16:38,337 INFO L276 IsEmpty]: Start isEmpty. Operand 613 states and 796 transitions. [2020-07-21 14:16:38,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 708 [2020-07-21 14:16:38,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:38,343 INFO L422 BasicCegarLoop]: trace histogram [90, 90, 90, 89, 89, 89, 89, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:38,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:38,544 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:38,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:38,545 INFO L82 PathProgramCache]: Analyzing trace with hash -1360123809, now seen corresponding path program 31 times [2020-07-21 14:16:38,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:38,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686508253] [2020-07-21 14:16:38,546 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:38,703 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:16:38,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:38,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 809 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 14:16:38,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:39,315 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 12374 proven. 1344 refuted. 0 times theorem prover too weak. 16019 trivial. 0 not checked. [2020-07-21 14:16:39,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:40,520 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 9512 proven. 1344 refuted. 0 times theorem prover too weak. 18881 trivial. 0 not checked. [2020-07-21 14:16:40,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686508253] [2020-07-21 14:16:40,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:40,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2020-07-21 14:16:40,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672671189] [2020-07-21 14:16:40,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 14:16:40,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:40,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 14:16:40,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=418, Unknown=0, NotChecked=0, Total=552 [2020-07-21 14:16:40,523 INFO L87 Difference]: Start difference. First operand 613 states and 796 transitions. Second operand 24 states. [2020-07-21 14:16:42,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:42,972 INFO L93 Difference]: Finished difference Result 802 states and 1052 transitions. [2020-07-21 14:16:42,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-21 14:16:42,974 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 707 [2020-07-21 14:16:42,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:42,977 INFO L225 Difference]: With dead ends: 802 [2020-07-21 14:16:42,977 INFO L226 Difference]: Without dead ends: 490 [2020-07-21 14:16:42,979 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1455 GetRequests, 1391 SyntacticMatches, 6 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 684 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1039, Invalid=2501, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 14:16:42,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-21 14:16:43,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 490. [2020-07-21 14:16:43,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2020-07-21 14:16:43,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 633 transitions. [2020-07-21 14:16:43,074 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 633 transitions. Word has length 707 [2020-07-21 14:16:43,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:43,075 INFO L479 AbstractCegarLoop]: Abstraction has 490 states and 633 transitions. [2020-07-21 14:16:43,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 14:16:43,075 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 633 transitions. [2020-07-21 14:16:43,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 715 [2020-07-21 14:16:43,080 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:43,081 INFO L422 BasicCegarLoop]: trace histogram [91, 91, 91, 90, 90, 90, 90, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:43,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:43,282 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:43,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:43,283 INFO L82 PathProgramCache]: Analyzing trace with hash 1558816766, now seen corresponding path program 32 times [2020-07-21 14:16:43,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:43,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465382747] [2020-07-21 14:16:43,284 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:43,489 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:43,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:43,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 1263 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 14:16:43,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:44,256 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 1600 proven. 10313 refuted. 0 times theorem prover too weak. 18467 trivial. 0 not checked. [2020-07-21 14:16:44,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:45,531 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 900 proven. 10313 refuted. 0 times theorem prover too weak. 19167 trivial. 0 not checked. [2020-07-21 14:16:45,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465382747] [2020-07-21 14:16:45,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:45,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 29 [2020-07-21 14:16:45,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326286277] [2020-07-21 14:16:45,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 14:16:45,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:45,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 14:16:45,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=637, Unknown=0, NotChecked=0, Total=812 [2020-07-21 14:16:45,534 INFO L87 Difference]: Start difference. First operand 490 states and 633 transitions. Second operand 29 states. [2020-07-21 14:16:55,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:55,060 INFO L93 Difference]: Finished difference Result 785 states and 1037 transitions. [2020-07-21 14:16:55,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-07-21 14:16:55,062 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 714 [2020-07-21 14:16:55,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:55,066 INFO L225 Difference]: With dead ends: 785 [2020-07-21 14:16:55,066 INFO L226 Difference]: Without dead ends: 605 [2020-07-21 14:16:55,070 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1540 GetRequests, 1393 SyntacticMatches, 7 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8078 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=4264, Invalid=15758, Unknown=0, NotChecked=0, Total=20022 [2020-07-21 14:16:55,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2020-07-21 14:16:55,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 514. [2020-07-21 14:16:55,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-21 14:16:55,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 665 transitions. [2020-07-21 14:16:55,214 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 665 transitions. Word has length 714 [2020-07-21 14:16:55,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:55,215 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 665 transitions. [2020-07-21 14:16:55,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 14:16:55,215 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 665 transitions. [2020-07-21 14:16:55,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 760 [2020-07-21 14:16:55,225 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:55,225 INFO L422 BasicCegarLoop]: trace histogram [97, 97, 97, 96, 96, 96, 96, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:55,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:55,439 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:55,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:55,440 INFO L82 PathProgramCache]: Analyzing trace with hash 937711205, now seen corresponding path program 33 times [2020-07-21 14:16:55,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:55,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [664041931] [2020-07-21 14:16:55,441 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:55,665 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:16:55,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:55,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 866 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 14:16:55,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:56,645 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 14422 proven. 1721 refuted. 0 times theorem prover too weak. 18394 trivial. 0 not checked. [2020-07-21 14:16:56,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:58,197 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 9744 proven. 3285 refuted. 0 times theorem prover too weak. 21508 trivial. 0 not checked. [2020-07-21 14:16:58,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [664041931] [2020-07-21 14:16:58,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:58,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 28 [2020-07-21 14:16:58,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496247294] [2020-07-21 14:16:58,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 14:16:58,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:58,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 14:16:58,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=581, Unknown=0, NotChecked=0, Total=756 [2020-07-21 14:16:58,201 INFO L87 Difference]: Start difference. First operand 514 states and 665 transitions. Second operand 28 states. [2020-07-21 14:17:02,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:02,208 INFO L93 Difference]: Finished difference Result 684 states and 896 transitions. [2020-07-21 14:17:02,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-21 14:17:02,211 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 759 [2020-07-21 14:17:02,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:02,215 INFO L225 Difference]: With dead ends: 684 [2020-07-21 14:17:02,215 INFO L226 Difference]: Without dead ends: 514 [2020-07-21 14:17:02,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1576 GetRequests, 1491 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1396 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1853, Invalid=4627, Unknown=0, NotChecked=0, Total=6480 [2020-07-21 14:17:02,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-21 14:17:02,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 514. [2020-07-21 14:17:02,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-21 14:17:02,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 663 transitions. [2020-07-21 14:17:02,300 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 663 transitions. Word has length 759 [2020-07-21 14:17:02,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:02,301 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 663 transitions. [2020-07-21 14:17:02,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 14:17:02,301 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 663 transitions. [2020-07-21 14:17:02,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 767 [2020-07-21 14:17:02,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:02,309 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 98, 97, 97, 97, 97, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:02,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:02,510 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:02,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:02,511 INFO L82 PathProgramCache]: Analyzing trace with hash -661993672, now seen corresponding path program 34 times [2020-07-21 14:17:02,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:02,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1529939681] [2020-07-21 14:17:02,512 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:02,725 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:02,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:02,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 1353 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 14:17:02,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:03,650 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 1070 proven. 12705 refuted. 0 times theorem prover too weak. 21455 trivial. 0 not checked. [2020-07-21 14:17:03,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:05,264 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 688 proven. 12705 refuted. 0 times theorem prover too weak. 21837 trivial. 0 not checked. [2020-07-21 14:17:05,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1529939681] [2020-07-21 14:17:05,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:05,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 33 [2020-07-21 14:17:05,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951897591] [2020-07-21 14:17:05,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 14:17:05,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:05,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 14:17:05,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=840, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 14:17:05,267 INFO L87 Difference]: Start difference. First operand 514 states and 663 transitions. Second operand 33 states. [2020-07-21 14:17:18,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:18,506 INFO L93 Difference]: Finished difference Result 784 states and 1029 transitions. [2020-07-21 14:17:18,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2020-07-21 14:17:18,508 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 766 [2020-07-21 14:17:18,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:18,513 INFO L225 Difference]: With dead ends: 784 [2020-07-21 14:17:18,513 INFO L226 Difference]: Without dead ends: 601 [2020-07-21 14:17:18,517 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1662 GetRequests, 1493 SyntacticMatches, 7 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10746 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=5648, Invalid=21084, Unknown=0, NotChecked=0, Total=26732 [2020-07-21 14:17:18,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2020-07-21 14:17:18,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 541. [2020-07-21 14:17:18,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-21 14:17:18,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 699 transitions. [2020-07-21 14:17:18,608 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 699 transitions. Word has length 766 [2020-07-21 14:17:18,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:18,609 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 699 transitions. [2020-07-21 14:17:18,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 14:17:18,610 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 699 transitions. [2020-07-21 14:17:18,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 819 [2020-07-21 14:17:18,616 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:18,616 INFO L422 BasicCegarLoop]: trace histogram [105, 105, 105, 104, 104, 104, 104, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:18,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:18,817 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:18,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:18,818 INFO L82 PathProgramCache]: Analyzing trace with hash -1871274638, now seen corresponding path program 35 times [2020-07-21 14:17:18,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:18,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1341332773] [2020-07-21 14:17:18,819 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:18,988 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:17:18,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:18,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 931 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 14:17:19,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:20,004 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 16919 proven. 2161 refuted. 0 times theorem prover too weak. 21360 trivial. 0 not checked. [2020-07-21 14:17:20,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:21,909 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 10149 proven. 5529 refuted. 0 times theorem prover too weak. 24762 trivial. 0 not checked. [2020-07-21 14:17:21,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1341332773] [2020-07-21 14:17:21,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:21,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 32 [2020-07-21 14:17:21,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096557873] [2020-07-21 14:17:21,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 14:17:21,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:21,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 14:17:21,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=770, Unknown=0, NotChecked=0, Total=992 [2020-07-21 14:17:21,912 INFO L87 Difference]: Start difference. First operand 541 states and 699 transitions. Second operand 32 states. [2020-07-21 14:17:30,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:30,958 INFO L93 Difference]: Finished difference Result 711 states and 929 transitions. [2020-07-21 14:17:30,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-21 14:17:30,962 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 818 [2020-07-21 14:17:30,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:30,968 INFO L225 Difference]: With dead ends: 711 [2020-07-21 14:17:30,968 INFO L226 Difference]: Without dead ends: 541 [2020-07-21 14:17:30,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1712 GetRequests, 1605 SyntacticMatches, 6 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2503 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=2931, Invalid=7575, Unknown=0, NotChecked=0, Total=10506 [2020-07-21 14:17:30,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2020-07-21 14:17:31,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 541. [2020-07-21 14:17:31,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-21 14:17:31,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 697 transitions. [2020-07-21 14:17:31,122 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 697 transitions. Word has length 818 [2020-07-21 14:17:31,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:31,123 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 697 transitions. [2020-07-21 14:17:31,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 14:17:31,124 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 697 transitions. [2020-07-21 14:17:31,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 826 [2020-07-21 14:17:31,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:31,134 INFO L422 BasicCegarLoop]: trace histogram [106, 106, 106, 105, 105, 105, 105, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:31,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:31,347 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:31,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:31,348 INFO L82 PathProgramCache]: Analyzing trace with hash -778442869, now seen corresponding path program 36 times [2020-07-21 14:17:31,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:31,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365638011] [2020-07-21 14:17:31,349 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:31,573 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:31,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:31,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 1455 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 14:17:31,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:32,848 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 432 proven. 15614 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-21 14:17:32,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:35,136 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 432 proven. 15614 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-21 14:17:35,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365638011] [2020-07-21 14:17:35,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:35,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 37 [2020-07-21 14:17:35,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377063551] [2020-07-21 14:17:35,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 14:17:35,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:35,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 14:17:35,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1069, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 14:17:35,139 INFO L87 Difference]: Start difference. First operand 541 states and 697 transitions. Second operand 37 states. [2020-07-21 14:17:57,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:57,170 INFO L93 Difference]: Finished difference Result 791 states and 1034 transitions. [2020-07-21 14:17:57,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2020-07-21 14:17:57,174 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 825 [2020-07-21 14:17:57,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:57,180 INFO L225 Difference]: With dead ends: 791 [2020-07-21 14:17:57,181 INFO L226 Difference]: Without dead ends: 605 [2020-07-21 14:17:57,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1800 GetRequests, 1607 SyntacticMatches, 7 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14327 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=7368, Invalid=27788, Unknown=0, NotChecked=0, Total=35156 [2020-07-21 14:17:57,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2020-07-21 14:17:57,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 571. [2020-07-21 14:17:57,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 571 states. [2020-07-21 14:17:57,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 571 states to 571 states and 737 transitions. [2020-07-21 14:17:57,305 INFO L78 Accepts]: Start accepts. Automaton has 571 states and 737 transitions. Word has length 825 [2020-07-21 14:17:57,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:57,306 INFO L479 AbstractCegarLoop]: Abstraction has 571 states and 737 transitions. [2020-07-21 14:17:57,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 14:17:57,306 INFO L276 IsEmpty]: Start isEmpty. Operand 571 states and 737 transitions. [2020-07-21 14:17:57,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 885 [2020-07-21 14:17:57,313 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:57,313 INFO L422 BasicCegarLoop]: trace histogram [114, 114, 114, 113, 113, 113, 113, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:57,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:57,522 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:57,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:57,523 INFO L82 PathProgramCache]: Analyzing trace with hash -1882081448, now seen corresponding path program 37 times [2020-07-21 14:17:57,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:57,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005672998] [2020-07-21 14:17:57,524 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:57,720 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:17:57,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:57,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 1004 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 14:17:57,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:59,308 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 19928 proven. 2673 refuted. 0 times theorem prover too weak. 25016 trivial. 0 not checked. [2020-07-21 14:17:59,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:02,323 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 10790 proven. 8085 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2020-07-21 14:18:02,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1005672998] [2020-07-21 14:18:02,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:18:02,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-21 14:18:02,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371290445] [2020-07-21 14:18:02,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 14:18:02,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:02,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 14:18:02,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=985, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 14:18:02,326 INFO L87 Difference]: Start difference. First operand 571 states and 737 transitions. Second operand 36 states. [2020-07-21 14:18:14,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:18:14,704 INFO L93 Difference]: Finished difference Result 742 states and 967 transitions. [2020-07-21 14:18:14,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-21 14:18:14,708 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 884 [2020-07-21 14:18:14,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:18:14,713 INFO L225 Difference]: With dead ends: 742 [2020-07-21 14:18:14,714 INFO L226 Difference]: Without dead ends: 572 [2020-07-21 14:18:14,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1863 GetRequests, 1733 SyntacticMatches, 6 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3978 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=4351, Invalid=11399, Unknown=0, NotChecked=0, Total=15750 [2020-07-21 14:18:14,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2020-07-21 14:18:14,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 540. [2020-07-21 14:18:14,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 540 states. [2020-07-21 14:18:14,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540 states to 540 states and 692 transitions. [2020-07-21 14:18:14,815 INFO L78 Accepts]: Start accepts. Automaton has 540 states and 692 transitions. Word has length 884 [2020-07-21 14:18:14,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:18:14,815 INFO L479 AbstractCegarLoop]: Abstraction has 540 states and 692 transitions. [2020-07-21 14:18:14,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 14:18:14,816 INFO L276 IsEmpty]: Start isEmpty. Operand 540 states and 692 transitions. [2020-07-21 14:18:14,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 892 [2020-07-21 14:18:14,824 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:18:14,824 INFO L422 BasicCegarLoop]: trace histogram [115, 115, 115, 114, 114, 114, 114, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:18:15,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:15,026 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:18:15,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:18:15,027 INFO L82 PathProgramCache]: Analyzing trace with hash 932118245, now seen corresponding path program 38 times [2020-07-21 14:18:15,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:18:15,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765495469] [2020-07-21 14:18:15,028 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:15,279 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:18:15,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:18:15,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 1569 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 14:18:15,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:18:16,415 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:18:16,417 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:18:16,970 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 17979 proven. 150 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-21 14:18:16,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:17,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:18:20,302 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 7048 proven. 11081 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-21 14:18:20,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765495469] [2020-07-21 14:18:20,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:18:20,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-21 14:18:20,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470288117] [2020-07-21 14:18:20,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 14:18:20,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:20,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 14:18:20,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=854, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 14:18:20,305 INFO L87 Difference]: Start difference. First operand 540 states and 692 transitions. Second operand 36 states. [2020-07-21 14:18:27,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:18:27,280 INFO L93 Difference]: Finished difference Result 690 states and 898 transitions. [2020-07-21 14:18:27,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-21 14:18:27,285 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 891 [2020-07-21 14:18:27,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:18:27,291 INFO L225 Difference]: With dead ends: 690 [2020-07-21 14:18:27,292 INFO L226 Difference]: Without dead ends: 688 [2020-07-21 14:18:27,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1853 GetRequests, 1757 SyntacticMatches, 6 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2506 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=2537, Invalid=5835, Unknown=0, NotChecked=0, Total=8372 [2020-07-21 14:18:27,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688 states. [2020-07-21 14:18:27,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688 to 610. [2020-07-21 14:18:27,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 610 states. [2020-07-21 14:18:27,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 610 states to 610 states and 794 transitions. [2020-07-21 14:18:27,419 INFO L78 Accepts]: Start accepts. Automaton has 610 states and 794 transitions. Word has length 891 [2020-07-21 14:18:27,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:18:27,421 INFO L479 AbstractCegarLoop]: Abstraction has 610 states and 794 transitions. [2020-07-21 14:18:27,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 14:18:27,421 INFO L276 IsEmpty]: Start isEmpty. Operand 610 states and 794 transitions. [2020-07-21 14:18:27,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 934 [2020-07-21 14:18:27,433 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:18:27,434 INFO L422 BasicCegarLoop]: trace histogram [121, 121, 121, 120, 120, 120, 120, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:18:27,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:27,635 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:18:27,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:18:27,636 INFO L82 PathProgramCache]: Analyzing trace with hash -1311394747, now seen corresponding path program 39 times [2020-07-21 14:18:27,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:18:27,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582465178] [2020-07-21 14:18:27,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:27,908 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:18:27,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:18:27,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 1641 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 14:18:27,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:18:30,178 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 4615 proven. 19121 refuted. 0 times theorem prover too weak. 29726 trivial. 0 not checked. [2020-07-21 14:18:30,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:34,182 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 2325 proven. 19121 refuted. 0 times theorem prover too weak. 32016 trivial. 0 not checked. [2020-07-21 14:18:34,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582465178] [2020-07-21 14:18:34,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:18:34,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 41 [2020-07-21 14:18:34,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574582694] [2020-07-21 14:18:34,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-21 14:18:34,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:34,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-21 14:18:34,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=1324, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 14:18:34,185 INFO L87 Difference]: Start difference. First operand 610 states and 794 transitions. Second operand 41 states. [2020-07-21 14:19:11,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:19:11,332 INFO L93 Difference]: Finished difference Result 911 states and 1218 transitions. [2020-07-21 14:19:11,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 166 states. [2020-07-21 14:19:11,338 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 933 [2020-07-21 14:19:11,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:19:11,343 INFO L225 Difference]: With dead ends: 911 [2020-07-21 14:19:11,344 INFO L226 Difference]: Without dead ends: 695 [2020-07-21 14:19:11,349 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2024 GetRequests, 1819 SyntacticMatches, 7 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16140 ImplicationChecksByTransitivity, 30.7s TimeCoverageRelationStatistics Valid=8499, Invalid=31301, Unknown=0, NotChecked=0, Total=39800 [2020-07-21 14:19:11,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2020-07-21 14:19:11,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 643. [2020-07-21 14:19:11,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 643 states. [2020-07-21 14:19:11,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 838 transitions. [2020-07-21 14:19:11,495 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 838 transitions. Word has length 933 [2020-07-21 14:19:11,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:19:11,496 INFO L479 AbstractCegarLoop]: Abstraction has 643 states and 838 transitions. [2020-07-21 14:19:11,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-21 14:19:11,497 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 838 transitions. [2020-07-21 14:19:11,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1000 [2020-07-21 14:19:11,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:19:11,513 INFO L422 BasicCegarLoop]: trace histogram [130, 130, 130, 129, 129, 129, 129, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:19:11,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:11,727 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:19:11,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:19:11,728 INFO L82 PathProgramCache]: Analyzing trace with hash -874980193, now seen corresponding path program 40 times [2020-07-21 14:19:11,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:19:11,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1237292492] [2020-07-21 14:19:11,729 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:11,940 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:19:11,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:19:11,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 1130 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 14:19:11,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:19:14,351 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 28429 proven. 3266 refuted. 0 times theorem prover too weak. 29980 trivial. 0 not checked. [2020-07-21 14:19:14,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:19:19,620 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 13923 proven. 10962 refuted. 0 times theorem prover too weak. 36790 trivial. 0 not checked. [2020-07-21 14:19:19,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1237292492] [2020-07-21 14:19:19,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:19:19,622 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 40 [2020-07-21 14:19:19,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454788312] [2020-07-21 14:19:19,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 14:19:19,624 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:19:19,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 14:19:19,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=1226, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 14:19:19,625 INFO L87 Difference]: Start difference. First operand 643 states and 838 transitions. Second operand 40 states. [2020-07-21 14:19:42,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:19:42,691 INFO L93 Difference]: Finished difference Result 1106 states and 1481 transitions. [2020-07-21 14:19:42,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2020-07-21 14:19:42,697 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 999 [2020-07-21 14:19:42,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:19:42,702 INFO L225 Difference]: With dead ends: 1106 [2020-07-21 14:19:42,702 INFO L226 Difference]: Without dead ends: 715 [2020-07-21 14:19:42,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2114 GetRequests, 1959 SyntacticMatches, 6 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5990 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=6299, Invalid=16351, Unknown=0, NotChecked=0, Total=22650 [2020-07-21 14:19:42,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 715 states. [2020-07-21 14:19:42,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 715 to 695. [2020-07-21 14:19:42,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 695 states. [2020-07-21 14:19:42,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 913 transitions. [2020-07-21 14:19:42,879 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 913 transitions. Word has length 999 [2020-07-21 14:19:42,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:19:42,880 INFO L479 AbstractCegarLoop]: Abstraction has 695 states and 913 transitions. [2020-07-21 14:19:42,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 14:19:42,880 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 913 transitions. [2020-07-21 14:19:42,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1007 [2020-07-21 14:19:42,892 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:19:42,892 INFO L422 BasicCegarLoop]: trace histogram [131, 131, 131, 130, 130, 130, 130, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:19:43,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:43,094 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:19:43,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:19:43,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1744475458, now seen corresponding path program 41 times [2020-07-21 14:19:43,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:19:43,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [314228467] [2020-07-21 14:19:43,096 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:43,405 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:19:43,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:19:43,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 1767 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 14:19:43,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:19:46,337 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 4166 proven. 23316 refuted. 0 times theorem prover too weak. 35120 trivial. 0 not checked. [2020-07-21 14:19:46,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:19:52,081 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 2158 proven. 23316 refuted. 0 times theorem prover too weak. 37128 trivial. 0 not checked. [2020-07-21 14:19:52,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [314228467] [2020-07-21 14:19:52,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:19:52,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 45 [2020-07-21 14:19:52,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464970569] [2020-07-21 14:19:52,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-07-21 14:19:52,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:19:52,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-07-21 14:19:52,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=375, Invalid=1605, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 14:19:52,084 INFO L87 Difference]: Start difference. First operand 695 states and 913 transitions. Second operand 45 states. [2020-07-21 14:19:53,055 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:19:53,288 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:19:53,626 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 14:19:54,314 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:19:54,559 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:19:54,828 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:19:55,057 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:19:55,539 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:19:55,787 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:19:56,377 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:19:56,926 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-21 14:19:57,182 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:19:57,442 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:19:57,678 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:19:57,885 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:19:58,149 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:19:58,410 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:19:58,696 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:19:59,036 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:19:59,318 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:19:59,622 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:19:59,924 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:20:00,154 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:20:00,454 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:20:00,821 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:20:01,081 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:20:01,327 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 14:20:01,568 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:20:01,842 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:20:02,213 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:02,520 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:20:02,789 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:03,045 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:20:03,277 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 14:20:03,557 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:20:03,853 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:20:04,198 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:04,568 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:20:04,876 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:05,182 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:20:05,463 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:20:05,765 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:20:06,009 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 22 [2020-07-21 14:20:06,347 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:20:06,757 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:20:07,129 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:07,474 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:07,802 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:08,129 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 14:20:08,401 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:20:08,981 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:09,289 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:20:09,689 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:20:10,208 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:20:10,464 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 14:20:10,714 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:20:10,977 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:20:11,248 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-21 14:20:11,569 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:20:11,911 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:12,207 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:12,467 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:20:12,973 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:20:13,246 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:20:13,701 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:20:14,108 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 14:20:14,523 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:20:14,875 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:20:15,190 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 14:20:15,505 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:20:15,845 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:20:16,124 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:20:16,494 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:16,927 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:20:17,357 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:20:17,752 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:18,108 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:20:18,468 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:18,775 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:19,042 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:19,347 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:20:19,665 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:20:20,125 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:20:20,628 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:20:21,089 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:20:21,567 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:20:22,000 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:20:22,424 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:20:22,822 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:20:23,181 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:20:23,560 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:20:23,862 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:20:24,187 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-21 14:20:24,483 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:20:25,039 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:20:25,297 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:20:25,569 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:20:26,178 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-21 14:20:26,499 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:20:26,852 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 14:20:28,297 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:20:29,623 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:20:30,020 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:20:30,720 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:20:31,063 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:20:31,394 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:20:32,571 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:20:34,161 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:20:34,502 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 14:20:35,079 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:20:35,398 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 14:20:35,738 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:20:36,195 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:20:37,172 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:20:37,667 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 14:20:38,114 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:20:38,543 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:20:38,960 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:20:39,335 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:20:40,002 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 14:20:40,315 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 14:20:40,961 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:20:41,502 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:20:41,935 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 14:20:42,378 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:20:43,803 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:20:44,013 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:20:45,496 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 14:20:46,431 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 14:20:46,642 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:20:47,007 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:20:47,219 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 14:20:47,513 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:20:47,744 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 14:20:47,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:20:47,821 INFO L93 Difference]: Finished difference Result 1178 states and 1580 transitions. [2020-07-21 14:20:47,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 185 states. [2020-07-21 14:20:47,829 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 1006 [2020-07-21 14:20:47,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:20:47,835 INFO L225 Difference]: With dead ends: 1178 [2020-07-21 14:20:47,835 INFO L226 Difference]: Without dead ends: 871 [2020-07-21 14:20:47,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2190 GetRequests, 1961 SyntacticMatches, 7 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20395 ImplicationChecksByTransitivity, 46.1s TimeCoverageRelationStatistics Valid=11282, Invalid=38670, Unknown=0, NotChecked=0, Total=49952 [2020-07-21 14:20:47,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2020-07-21 14:20:48,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 733. [2020-07-21 14:20:48,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 733 states. [2020-07-21 14:20:48,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 733 states to 733 states and 965 transitions. [2020-07-21 14:20:48,006 INFO L78 Accepts]: Start accepts. Automaton has 733 states and 965 transitions. Word has length 1006 [2020-07-21 14:20:48,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:20:48,007 INFO L479 AbstractCegarLoop]: Abstraction has 733 states and 965 transitions. [2020-07-21 14:20:48,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-07-21 14:20:48,007 INFO L276 IsEmpty]: Start isEmpty. Operand 733 states and 965 transitions. [2020-07-21 14:20:48,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1083 [2020-07-21 14:20:48,019 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:20:48,019 INFO L422 BasicCegarLoop]: trace histogram [141, 141, 141, 140, 140, 140, 140, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:20:48,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:20:48,221 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:20:48,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:20:48,222 INFO L82 PathProgramCache]: Analyzing trace with hash 2076739844, now seen corresponding path program 42 times [2020-07-21 14:20:48,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:20:48,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442489760] [2020-07-21 14:20:48,223 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:20:48,468 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:20:48,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:20:48,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 1222 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 14:20:48,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:20:51,835 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 33195 proven. 3949 refuted. 0 times theorem prover too weak. 35362 trivial. 0 not checked. [2020-07-21 14:20:51,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:20:59,080 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 15505 proven. 14169 refuted. 0 times theorem prover too weak. 42832 trivial. 0 not checked. [2020-07-21 14:20:59,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442489760] [2020-07-21 14:20:59,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:20:59,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 44 [2020-07-21 14:20:59,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589786246] [2020-07-21 14:20:59,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 14:20:59,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:20:59,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 14:20:59,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=399, Invalid=1493, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 14:20:59,083 INFO L87 Difference]: Start difference. First operand 733 states and 965 transitions. Second operand 44 states. [2020-07-21 14:21:27,222 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2020-07-21 14:21:27,741 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 14:21:28,238 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 14:21:28,524 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 14:21:28,799 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 14:21:29,076 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 14:21:29,375 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 14:21:29,680 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 14:21:29,981 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 14:21:30,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:21:30,813 INFO L93 Difference]: Finished difference Result 1089 states and 1476 transitions. [2020-07-21 14:21:30,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2020-07-21 14:21:30,820 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 1082 [2020-07-21 14:21:30,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:21:30,827 INFO L225 Difference]: With dead ends: 1089 [2020-07-21 14:21:30,827 INFO L226 Difference]: Without dead ends: 804 [2020-07-21 14:21:30,832 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2281 GetRequests, 2121 SyntacticMatches, 6 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6334 ImplicationChecksByTransitivity, 24.7s TimeCoverageRelationStatistics Valid=6718, Invalid=17462, Unknown=0, NotChecked=0, Total=24180 [2020-07-21 14:21:30,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 804 states. [2020-07-21 14:21:31,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 804 to 785. [2020-07-21 14:21:31,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 785 states. [2020-07-21 14:21:31,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 1040 transitions. [2020-07-21 14:21:31,013 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 1040 transitions. Word has length 1082 [2020-07-21 14:21:31,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:21:31,014 INFO L479 AbstractCegarLoop]: Abstraction has 785 states and 1040 transitions. [2020-07-21 14:21:31,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 14:21:31,015 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 1040 transitions. [2020-07-21 14:21:31,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1090 [2020-07-21 14:21:31,028 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:21:31,029 INFO L422 BasicCegarLoop]: trace histogram [142, 142, 142, 141, 141, 141, 141, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:21:31,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:21:31,245 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:21:31,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:21:31,246 INFO L82 PathProgramCache]: Analyzing trace with hash -690954159, now seen corresponding path program 43 times [2020-07-21 14:21:31,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:21:31,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32000829] [2020-07-21 14:21:31,247 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:21:31,584 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:21:31,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:21:31,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 1911 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 14:21:31,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:21:33,769 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 8093 proven. 22813 refuted. 0 times theorem prover too weak. 42605 trivial. 0 not checked. [2020-07-21 14:21:33,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:21:39,551 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 3853 proven. 22813 refuted. 0 times theorem prover too weak. 46845 trivial. 0 not checked. [2020-07-21 14:21:39,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32000829] [2020-07-21 14:21:39,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:21:39,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 28 [2020-07-21 14:21:39,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64348305] [2020-07-21 14:21:39,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 14:21:39,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:21:39,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 14:21:39,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=581, Unknown=0, NotChecked=0, Total=756 [2020-07-21 14:21:39,555 INFO L87 Difference]: Start difference. First operand 785 states and 1040 transitions. Second operand 28 states. [2020-07-21 14:21:40,069 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 14 [2020-07-21 14:21:40,329 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2020-07-21 14:21:40,588 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 17 [2020-07-21 14:21:40,859 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 16 [2020-07-21 14:21:41,550 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2020-07-21 14:21:41,815 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 14:21:43,070 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 14 [2020-07-21 14:21:43,344 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:21:43,590 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2020-07-21 14:21:43,856 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2020-07-21 14:21:44,140 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 14:21:45,638 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 14 [2020-07-21 14:21:45,942 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:21:46,205 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-07-21 14:21:46,470 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:21:46,757 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2020-07-21 14:21:47,055 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 14:21:49,136 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 14 [2020-07-21 14:21:49,461 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:21:49,759 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-07-21 14:21:50,049 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:21:50,308 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:21:50,600 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2020-07-21 14:21:50,890 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 14:21:53,155 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 14 [2020-07-21 14:21:53,476 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:21:53,747 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-07-21 14:21:54,039 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 14:21:54,330 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 14:21:54,613 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:21:54,920 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2020-07-21 14:21:55,208 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:21:57,606 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 14 [2020-07-21 14:21:57,916 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 14:21:58,190 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2020-07-21 14:21:58,458 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 14:21:58,984 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 14:21:59,433 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 14:21:59,961 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2020-07-21 14:22:00,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:22:00,305 INFO L93 Difference]: Finished difference Result 1691 states and 2300 transitions. [2020-07-21 14:22:00,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-21 14:22:00,312 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 1089 [2020-07-21 14:22:00,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:22:00,320 INFO L225 Difference]: With dead ends: 1691 [2020-07-21 14:22:00,321 INFO L226 Difference]: Without dead ends: 1390 [2020-07-21 14:22:00,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2270 GetRequests, 2143 SyntacticMatches, 8 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5615 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=3057, Invalid=11463, Unknown=0, NotChecked=0, Total=14520 [2020-07-21 14:22:00,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1390 states. [2020-07-21 14:22:00,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1390 to 984. [2020-07-21 14:22:00,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 984 states. [2020-07-21 14:22:00,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 984 states to 984 states and 1300 transitions. [2020-07-21 14:22:00,571 INFO L78 Accepts]: Start accepts. Automaton has 984 states and 1300 transitions. Word has length 1089 [2020-07-21 14:22:00,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:22:00,572 INFO L479 AbstractCegarLoop]: Abstraction has 984 states and 1300 transitions. [2020-07-21 14:22:00,572 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 14:22:00,573 INFO L276 IsEmpty]: Start isEmpty. Operand 984 states and 1300 transitions. [2020-07-21 14:22:00,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-21 14:22:00,586 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:22:00,586 INFO L422 BasicCegarLoop]: trace histogram [148, 148, 148, 147, 147, 147, 147, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:22:00,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:22:00,788 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:22:00,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:22:00,789 INFO L82 PathProgramCache]: Analyzing trace with hash -944230286, now seen corresponding path program 44 times [2020-07-21 14:22:00,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:22:00,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913209913] [2020-07-21 14:22:00,790 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:22:01,049 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:22:01,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:22:01,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 1279 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 14:22:01,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:22:03,043 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 34637 proven. 2618 refuted. 0 times theorem prover too weak. 42652 trivial. 0 not checked. [2020-07-21 14:22:03,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:22:09,270 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 26747 proven. 2618 refuted. 0 times theorem prover too weak. 50542 trivial. 0 not checked. [2020-07-21 14:22:09,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913209913] [2020-07-21 14:22:09,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:22:09,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2020-07-21 14:22:09,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744195958] [2020-07-21 14:22:09,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 14:22:09,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:22:09,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 14:22:09,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=534, Unknown=0, NotChecked=0, Total=702 [2020-07-21 14:22:09,274 INFO L87 Difference]: Start difference. First operand 984 states and 1300 transitions. Second operand 27 states. [2020-07-21 14:22:19,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:22:19,741 INFO L93 Difference]: Finished difference Result 1307 states and 1759 transitions. [2020-07-21 14:22:19,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-21 14:22:19,748 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 1134 [2020-07-21 14:22:19,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:22:19,754 INFO L225 Difference]: With dead ends: 1307 [2020-07-21 14:22:19,755 INFO L226 Difference]: Without dead ends: 810 [2020-07-21 14:22:19,757 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2319 GetRequests, 2242 SyntacticMatches, 7 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1055 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=1491, Invalid=3621, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 14:22:19,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 810 states. [2020-07-21 14:22:19,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 810 to 810. [2020-07-21 14:22:19,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 810 states. [2020-07-21 14:22:19,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 810 states to 810 states and 1070 transitions. [2020-07-21 14:22:19,952 INFO L78 Accepts]: Start accepts. Automaton has 810 states and 1070 transitions. Word has length 1134 [2020-07-21 14:22:19,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:22:19,953 INFO L479 AbstractCegarLoop]: Abstraction has 810 states and 1070 transitions. [2020-07-21 14:22:19,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 14:22:19,953 INFO L276 IsEmpty]: Start isEmpty. Operand 810 states and 1070 transitions. [2020-07-21 14:22:19,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1142 [2020-07-21 14:22:19,967 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:22:19,968 INFO L422 BasicCegarLoop]: trace histogram [149, 149, 149, 148, 148, 148, 148, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:22:20,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:22:20,169 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:22:20,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:22:20,170 INFO L82 PathProgramCache]: Analyzing trace with hash -211111029, now seen corresponding path program 45 times [2020-07-21 14:22:20,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:22:20,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1392765953] [2020-07-21 14:22:20,171 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:22:20,529 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:22:20,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:22:20,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 2001 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 14:22:20,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:22:23,243 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 7585 proven. 26386 refuted. 0 times theorem prover too weak. 46991 trivial. 0 not checked. [2020-07-21 14:22:23,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:22:29,945 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 3651 proven. 26386 refuted. 0 times theorem prover too weak. 50925 trivial. 0 not checked. [2020-07-21 14:22:29,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1392765953] [2020-07-21 14:22:29,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:22:29,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 32 [2020-07-21 14:22:29,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419218232] [2020-07-21 14:22:29,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 14:22:29,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:22:29,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 14:22:29,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=779, Unknown=0, NotChecked=0, Total=992 [2020-07-21 14:22:29,950 INFO L87 Difference]: Start difference. First operand 810 states and 1070 transitions. Second operand 32 states. [2020-07-21 14:22:30,590 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2020-07-21 14:22:30,866 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 14:22:31,150 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:22:31,444 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 14:22:31,820 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-07-21 14:22:32,097 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:22:32,361 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 14:22:32,639 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:22:32,912 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 16 [2020-07-21 14:22:33,231 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 14:22:33,498 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:22:33,799 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 14:22:34,098 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 14:22:34,427 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 14:22:34,816 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 14:22:35,103 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:22:35,361 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:22:35,621 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:22:35,916 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:22:36,195 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 14:22:36,491 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:22:36,773 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:22:37,041 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:22:37,339 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:22:37,661 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 14:22:39,602 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 14:22:39,912 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:22:40,211 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 14:22:40,497 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:22:40,778 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:22:41,101 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:22:41,423 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 14:22:41,741 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:22:42,025 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:22:42,323 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:22:42,610 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:22:42,926 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:22:43,263 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 14:22:45,572 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 14:22:45,903 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:22:46,207 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 14:22:46,513 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:22:46,815 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:22:47,132 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:22:47,471 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:22:47,798 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:22:48,176 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:22:48,533 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:22:48,871 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:22:49,189 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:22:49,482 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:22:49,823 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:22:50,130 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:22:55,392 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:22:55,756 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:22:56,074 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 14:22:56,378 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:22:56,683 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:22:56,983 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:22:57,313 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:22:57,663 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:22:58,062 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:22:58,467 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:22:58,852 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:22:59,221 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:22:59,549 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:22:59,863 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:23:00,154 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:23:00,472 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:23:00,836 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:23:04,245 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 14:23:04,584 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 14:23:04,915 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:23:05,223 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:23:05,510 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:23:05,794 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:23:06,075 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:23:06,371 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 17 [2020-07-21 14:23:06,709 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 14:23:07,064 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 14:23:07,301 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 14:23:07,576 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:23:08,000 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 14:23:08,344 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 14:23:08,670 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:23:08,992 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:23:09,303 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:23:09,615 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:23:09,887 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 14:23:10,122 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:23:10,520 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:23:10,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:23:10,966 INFO L93 Difference]: Finished difference Result 1330 states and 1815 transitions. [2020-07-21 14:23:10,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2020-07-21 14:23:10,973 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 1141 [2020-07-21 14:23:10,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:23:10,980 INFO L225 Difference]: With dead ends: 1330 [2020-07-21 14:23:10,981 INFO L226 Difference]: Without dead ends: 1019 [2020-07-21 14:23:10,990 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2427 GetRequests, 2243 SyntacticMatches, 8 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13489 ImplicationChecksByTransitivity, 33.3s TimeCoverageRelationStatistics Valid=6498, Invalid=25008, Unknown=0, NotChecked=0, Total=31506 [2020-07-21 14:23:10,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1019 states. [2020-07-21 14:23:11,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1019 to 837. [2020-07-21 14:23:11,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-21 14:23:11,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1106 transitions. [2020-07-21 14:23:11,228 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1106 transitions. Word has length 1141 [2020-07-21 14:23:11,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:23:11,230 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1106 transitions. [2020-07-21 14:23:11,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 14:23:11,230 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1106 transitions. [2020-07-21 14:23:11,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1194 [2020-07-21 14:23:11,245 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:23:11,245 INFO L422 BasicCegarLoop]: trace histogram [156, 156, 156, 155, 155, 155, 155, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:23:11,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:23:11,447 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:23:11,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:23:11,449 INFO L82 PathProgramCache]: Analyzing trace with hash -2061681211, now seen corresponding path program 46 times [2020-07-21 14:23:11,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:23:11,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1092735972] [2020-07-21 14:23:11,450 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:23:11,720 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:23:11,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:23:11,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 1345 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 14:23:11,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:23:14,292 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 38517 proven. 3198 refuted. 0 times theorem prover too weak. 47058 trivial. 0 not checked. [2020-07-21 14:23:14,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:23:19,547 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 27160 proven. 6185 refuted. 0 times theorem prover too weak. 55428 trivial. 0 not checked. [2020-07-21 14:23:19,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1092735972] [2020-07-21 14:23:19,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:23:19,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 31 [2020-07-21 14:23:19,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009624014] [2020-07-21 14:23:19,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 14:23:19,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:23:19,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 14:23:19,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2020-07-21 14:23:19,551 INFO L87 Difference]: Start difference. First operand 837 states and 1106 transitions. Second operand 31 states. [2020-07-21 14:23:31,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:23:31,504 INFO L93 Difference]: Finished difference Result 1138 states and 1536 transitions. [2020-07-21 14:23:31,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-21 14:23:31,508 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 1193 [2020-07-21 14:23:31,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:23:31,515 INFO L225 Difference]: With dead ends: 1138 [2020-07-21 14:23:31,515 INFO L226 Difference]: Without dead ends: 837 [2020-07-21 14:23:31,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2457 GetRequests, 2356 SyntacticMatches, 7 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=2584, Invalid=6536, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 14:23:31,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 837 states. [2020-07-21 14:23:31,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 837 to 837. [2020-07-21 14:23:31,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-21 14:23:31,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1104 transitions. [2020-07-21 14:23:31,692 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1104 transitions. Word has length 1193 [2020-07-21 14:23:31,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:23:31,693 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1104 transitions. [2020-07-21 14:23:31,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 14:23:31,693 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1104 transitions. [2020-07-21 14:23:31,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1201 [2020-07-21 14:23:31,706 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:23:31,706 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 157, 156, 156, 156, 156, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:23:31,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:23:31,907 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:23:31,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:23:31,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1739494104, now seen corresponding path program 47 times [2020-07-21 14:23:31,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:23:31,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [234345642] [2020-07-21 14:23:31,909 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:23:32,285 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:23:32,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:23:32,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 2103 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 14:23:32,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:23:34,775 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 7011 proven. 30616 refuted. 0 times theorem prover too weak. 52258 trivial. 0 not checked. [2020-07-21 14:23:34,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:23:40,298 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 3423 proven. 30616 refuted. 0 times theorem prover too weak. 55846 trivial. 0 not checked. [2020-07-21 14:23:40,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [234345642] [2020-07-21 14:23:40,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:23:40,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 36 [2020-07-21 14:23:40,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329311306] [2020-07-21 14:23:40,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 14:23:40,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:23:40,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 14:23:40,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1003, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 14:23:40,302 INFO L87 Difference]: Start difference. First operand 837 states and 1104 transitions. Second operand 36 states. [2020-07-21 14:23:41,384 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:23:43,193 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:23:43,417 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:23:45,693 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:23:47,344 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 14:23:47,609 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 14:23:50,477 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:23:56,823 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:23:57,327 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:23:58,024 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:23:58,663 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:23:58,987 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 14:24:00,034 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:24:00,290 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:24:06,276 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 14:24:06,522 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:24:07,795 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:24:08,423 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:24:09,180 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:24:09,693 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:24:10,438 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:24:10,818 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:24:11,479 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:24:12,323 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 14:24:12,595 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 14:24:20,857 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:24:21,559 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 14:24:24,181 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:24:24,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:24:24,902 INFO L93 Difference]: Finished difference Result 1314 states and 1782 transitions. [2020-07-21 14:24:24,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 190 states. [2020-07-21 14:24:24,908 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 1200 [2020-07-21 14:24:24,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:24:24,915 INFO L225 Difference]: With dead ends: 1314 [2020-07-21 14:24:24,915 INFO L226 Difference]: Without dead ends: 1000 [2020-07-21 14:24:24,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2581 GetRequests, 2357 SyntacticMatches, 8 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20752 ImplicationChecksByTransitivity, 36.6s TimeCoverageRelationStatistics Valid=9652, Invalid=37654, Unknown=0, NotChecked=0, Total=47306 [2020-07-21 14:24:24,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1000 states. [2020-07-21 14:24:25,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1000 to 867. [2020-07-21 14:24:25,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-21 14:24:25,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1144 transitions. [2020-07-21 14:24:25,115 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1144 transitions. Word has length 1200 [2020-07-21 14:24:25,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:24:25,116 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1144 transitions. [2020-07-21 14:24:25,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 14:24:25,116 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1144 transitions. [2020-07-21 14:24:25,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1260 [2020-07-21 14:24:25,131 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:24:25,131 INFO L422 BasicCegarLoop]: trace histogram [165, 165, 165, 164, 164, 164, 164, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:24:25,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:24:25,333 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:24:25,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:24:25,334 INFO L82 PathProgramCache]: Analyzing trace with hash -891846805, now seen corresponding path program 48 times [2020-07-21 14:24:25,334 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:24:25,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1302082005] [2020-07-21 14:24:25,335 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:24:25,614 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:24:25,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:24:25,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 1418 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 14:24:25,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:24:28,135 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 43091 proven. 3850 refuted. 0 times theorem prover too weak. 52334 trivial. 0 not checked. [2020-07-21 14:24:28,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:24:34,856 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 27808 proven. 10223 refuted. 0 times theorem prover too weak. 61244 trivial. 0 not checked. [2020-07-21 14:24:34,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1302082005] [2020-07-21 14:24:34,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:24:34,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-21 14:24:34,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976983693] [2020-07-21 14:24:34,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 14:24:34,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:24:34,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 14:24:34,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=926, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 14:24:34,859 INFO L87 Difference]: Start difference. First operand 867 states and 1144 transitions. Second operand 35 states. [2020-07-21 14:24:52,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:24:52,824 INFO L93 Difference]: Finished difference Result 1168 states and 1573 transitions. [2020-07-21 14:24:52,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-21 14:24:52,831 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 1259 [2020-07-21 14:24:52,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:24:52,837 INFO L225 Difference]: With dead ends: 1168 [2020-07-21 14:24:52,837 INFO L226 Difference]: Without dead ends: 867 [2020-07-21 14:24:52,841 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2609 GetRequests, 2484 SyntacticMatches, 7 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3533 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=3982, Invalid=10298, Unknown=0, NotChecked=0, Total=14280 [2020-07-21 14:24:52,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2020-07-21 14:24:53,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 867. [2020-07-21 14:24:53,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-21 14:24:53,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1142 transitions. [2020-07-21 14:24:53,038 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1142 transitions. Word has length 1259 [2020-07-21 14:24:53,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:24:53,040 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1142 transitions. [2020-07-21 14:24:53,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 14:24:53,041 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1142 transitions. [2020-07-21 14:24:53,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1267 [2020-07-21 14:24:53,055 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:24:53,055 INFO L422 BasicCegarLoop]: trace histogram [166, 166, 166, 165, 165, 165, 165, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:24:53,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:24:53,257 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:24:53,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:24:53,258 INFO L82 PathProgramCache]: Analyzing trace with hash -1524872590, now seen corresponding path program 49 times [2020-07-21 14:24:53,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:24:53,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18203931] [2020-07-21 14:24:53,259 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:24:53,617 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:24:53,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:24:53,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 2217 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 14:24:53,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:24:56,665 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 6350 proven. 35584 refuted. 0 times theorem prover too weak. 58517 trivial. 0 not checked. [2020-07-21 14:24:56,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:25:03,447 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 3160 proven. 35584 refuted. 0 times theorem prover too weak. 61707 trivial. 0 not checked. [2020-07-21 14:25:03,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18203931] [2020-07-21 14:25:03,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:25:03,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 40 [2020-07-21 14:25:03,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186605113] [2020-07-21 14:25:03,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 14:25:03,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:25:03,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 14:25:03,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=1253, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 14:25:03,450 INFO L87 Difference]: Start difference. First operand 867 states and 1142 transitions. Second operand 40 states. [2020-07-21 14:25:04,014 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:25:04,248 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:25:04,499 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:25:04,769 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:25:05,105 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:25:05,344 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:25:05,577 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 14:25:05,856 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:25:06,101 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:25:06,356 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:06,587 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:06,840 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:25:07,104 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:25:07,362 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:25:07,720 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 14:25:07,978 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 14:25:08,265 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:25:08,522 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:25:08,784 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:25:09,039 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:25:09,277 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:09,506 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:09,757 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:25:10,037 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:10,329 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 16 [2020-07-21 14:25:10,670 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:25:10,972 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 14:25:11,250 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:25:11,531 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 14:25:11,789 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:25:12,075 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:25:12,459 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:25:12,735 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:25:12,974 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:25:13,203 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:25:13,440 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:25:13,826 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:25:14,121 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:25:14,385 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:14,648 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:14,882 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:25:15,138 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 14:25:15,429 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:15,769 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:25:16,116 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:25:16,440 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:25:16,737 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:17,023 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:17,316 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:25:17,584 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:25:17,890 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:25:18,266 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:18,638 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:25:18,985 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:25:19,306 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:19,609 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:19,859 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:20,139 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:25:20,712 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:25:21,116 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:25:21,422 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:25:21,688 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 14:25:21,936 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:25:22,174 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:25:22,437 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:25:22,734 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:25:23,065 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:23,417 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:25:23,726 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:24,015 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:25:24,317 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:24,571 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:25:24,862 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:25:25,177 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:25,528 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:25:25,913 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:26,288 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:25:26,638 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:26,958 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:27,251 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:27,553 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:25:27,825 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:25:28,186 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:25:28,641 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:25:29,073 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:29,478 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:25:29,847 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:30,200 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:25:30,545 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:30,834 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:25:31,149 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:25:31,477 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:25:35,378 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:25:35,690 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:25:35,975 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 14:25:36,244 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:25:36,511 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:25:36,773 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:25:37,049 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:25:37,383 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:25:37,735 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:38,090 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:38,431 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:38,752 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 14:25:39,059 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 14:25:39,345 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:39,603 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 14:25:39,894 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:25:40,214 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:25:40,650 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:25:41,115 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:25:41,531 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:41,943 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:42,302 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:25:42,671 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:25:43,025 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:43,380 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:25:43,676 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-21 14:25:44,095 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:25:44,622 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:25:45,109 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:25:45,559 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:25:45,973 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:46,383 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:46,766 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:25:47,130 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:25:47,423 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:25:47,754 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:25:48,098 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:25:52,680 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:25:53,002 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 14:25:53,595 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:25:53,877 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:25:54,165 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:25:54,443 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 14:25:54,736 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 14:25:55,055 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 14:25:55,781 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:25:56,128 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:25:56,482 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 14:25:57,100 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 14:25:57,409 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:25:57,688 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:25:57,992 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 14:25:58,342 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:25:58,805 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:25:59,276 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:25:59,737 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:26:00,173 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:26:00,606 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:26:01,003 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:26:01,719 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:26:02,105 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 14:26:02,406 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 14:26:02,766 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 14:26:02,988 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:26:03,227 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:26:03,688 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:26:04,544 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 14:26:04,938 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:26:05,350 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:26:05,740 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:26:06,087 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 14:26:06,693 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:26:06,951 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 14:26:07,353 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:26:07,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:26:07,806 INFO L93 Difference]: Finished difference Result 1301 states and 1754 transitions. [2020-07-21 14:26:07,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 215 states. [2020-07-21 14:26:07,813 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 1266 [2020-07-21 14:26:07,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:26:07,820 INFO L225 Difference]: With dead ends: 1301 [2020-07-21 14:26:07,820 INFO L226 Difference]: Without dead ends: 984 [2020-07-21 14:26:07,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2738 GetRequests, 2485 SyntacticMatches, 8 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26619 ImplicationChecksByTransitivity, 52.3s TimeCoverageRelationStatistics Valid=12065, Invalid=48697, Unknown=0, NotChecked=0, Total=60762 [2020-07-21 14:26:07,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 984 states. [2020-07-21 14:26:08,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 984 to 900. [2020-07-21 14:26:08,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-21 14:26:08,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1186 transitions. [2020-07-21 14:26:08,053 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1186 transitions. Word has length 1266 [2020-07-21 14:26:08,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:26:08,054 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1186 transitions. [2020-07-21 14:26:08,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 14:26:08,054 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1186 transitions. [2020-07-21 14:26:08,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1333 [2020-07-21 14:26:08,070 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:26:08,071 INFO L422 BasicCegarLoop]: trace histogram [175, 175, 175, 174, 174, 174, 174, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:26:08,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:26:08,272 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:26:08,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:26:08,273 INFO L82 PathProgramCache]: Analyzing trace with hash -719015028, now seen corresponding path program 50 times [2020-07-21 14:26:08,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:26:08,274 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031774613] [2020-07-21 14:26:08,274 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:26:08,556 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:26:08,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:26:08,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 1498 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 14:26:08,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:26:11,787 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 48431 proven. 4583 refuted. 0 times theorem prover too weak. 58591 trivial. 0 not checked. [2020-07-21 14:26:11,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:26:19,739 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 28763 proven. 14741 refuted. 0 times theorem prover too weak. 68101 trivial. 0 not checked. [2020-07-21 14:26:19,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031774613] [2020-07-21 14:26:19,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:26:19,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 39 [2020-07-21 14:26:19,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836673693] [2020-07-21 14:26:19,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-21 14:26:19,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:26:19,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-21 14:26:19,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=1161, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 14:26:19,744 INFO L87 Difference]: Start difference. First operand 900 states and 1186 transitions. Second operand 39 states. [2020-07-21 14:26:43,995 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2020-07-21 14:26:44,232 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 14:26:45,710 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 14:26:46,291 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 14:26:46,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:26:46,988 INFO L93 Difference]: Finished difference Result 1201 states and 1614 transitions. [2020-07-21 14:26:46,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2020-07-21 14:26:46,995 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 1332 [2020-07-21 14:26:46,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:26:47,002 INFO L225 Difference]: With dead ends: 1201 [2020-07-21 14:26:47,003 INFO L226 Difference]: Without dead ends: 900 [2020-07-21 14:26:47,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2776 GetRequests, 2626 SyntacticMatches, 7 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5475 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=5748, Invalid=15132, Unknown=0, NotChecked=0, Total=20880 [2020-07-21 14:26:47,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2020-07-21 14:26:47,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 900. [2020-07-21 14:26:47,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-21 14:26:47,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1184 transitions. [2020-07-21 14:26:47,272 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1184 transitions. Word has length 1332 [2020-07-21 14:26:47,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:26:47,273 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1184 transitions. [2020-07-21 14:26:47,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-21 14:26:47,273 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1184 transitions. [2020-07-21 14:26:47,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1340 [2020-07-21 14:26:47,289 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:26:47,289 INFO L422 BasicCegarLoop]: trace histogram [176, 176, 176, 175, 175, 175, 175, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:26:47,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:26:47,490 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:26:47,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:26:47,492 INFO L82 PathProgramCache]: Analyzing trace with hash -78422223, now seen corresponding path program 51 times [2020-07-21 14:26:47,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:26:47,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596400927] [2020-07-21 14:26:47,493 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:26:47,896 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:26:47,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:26:47,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 2343 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 14:26:47,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:26:51,617 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 5581 proven. 41380 refuted. 0 times theorem prover too weak. 65891 trivial. 0 not checked. [2020-07-21 14:26:51,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:26:59,930 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 2853 proven. 41380 refuted. 0 times theorem prover too weak. 68619 trivial. 0 not checked. [2020-07-21 14:26:59,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596400927] [2020-07-21 14:26:59,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:26:59,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 44 [2020-07-21 14:26:59,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106328228] [2020-07-21 14:26:59,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 14:26:59,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:26:59,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 14:26:59,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1529, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 14:26:59,935 INFO L87 Difference]: Start difference. First operand 900 states and 1184 transitions. Second operand 44 states. [2020-07-21 14:27:00,594 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:27:00,840 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:27:01,097 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:01,379 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:27:01,768 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 14:27:02,012 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:27:02,266 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 14:27:02,533 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:02,788 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:03,090 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:03,393 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 14:27:03,639 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:27:03,930 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:27:04,346 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:27:04,605 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:27:04,834 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:27:05,074 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:27:05,351 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:05,661 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:05,978 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:06,237 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:06,539 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 14:27:06,820 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:27:07,130 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:07,518 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:07,870 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:08,171 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:08,443 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:08,736 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:27:09,055 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:09,357 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:09,799 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 14:27:10,114 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:27:10,387 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 14:27:10,653 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:27:10,924 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:27:11,367 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:11,746 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:12,045 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:12,350 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:12,639 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:27:12,935 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:27:13,283 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:13,688 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 14:27:14,050 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:14,368 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:27:14,663 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:14,932 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:15,242 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:27:15,571 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:15,981 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:27:16,457 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:16,890 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:17,284 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:17,644 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:17,973 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:18,312 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:27:18,610 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:27:18,949 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:27:19,427 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 14:27:19,732 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:27:20,000 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:27:20,253 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 14:27:20,502 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:27:20,789 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:27:21,078 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:27:21,435 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:21,824 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:22,143 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:27:22,444 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:22,719 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:23,016 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:27:23,434 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:23,865 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:24,253 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:24,631 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:24,983 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:25,302 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:25,593 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:27:25,905 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:27:26,243 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 14:27:26,690 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:27,173 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 14:27:27,635 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:28,086 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:28,514 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:28,907 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:29,249 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:27:29,628 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 14:27:29,945 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-21 14:27:30,389 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:27:30,906 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:31,437 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:31,945 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:32,415 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:32,861 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:33,256 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:33,635 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:33,966 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:34,315 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:27:34,658 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:27:35,022 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:27:35,506 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 14:27:35,821 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:27:36,117 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 14:27:36,406 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:27:36,683 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 14:27:36,964 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:27:37,281 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:27:37,604 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 14:27:37,990 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:38,414 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:38,766 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:27:39,123 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:39,440 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:27:39,748 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:40,095 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 14:27:40,408 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-21 14:27:40,830 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:41,313 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:41,757 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:42,170 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:42,581 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:42,956 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:43,318 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:43,649 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:43,987 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 14:27:44,343 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:27:44,843 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:45,405 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 14:27:45,925 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:46,441 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:46,919 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:47,376 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 14:27:47,788 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:48,174 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 14:27:48,577 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 14:27:48,899 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 14:27:49,401 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 14:27:50,015 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:50,591 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:51,137 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:51,662 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 14:27:52,158 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:52,622 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 14:27:53,056 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:27:53,456 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:27:53,769 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 14:27:54,112 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:27:54,454 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 14:28:00,358 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:28:00,714 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:28:01,036 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:28:01,363 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:28:01,674 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:28:01,964 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 14:28:02,248 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:28:02,555 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 14:28:02,874 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:28:03,280 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:28:03,735 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:28:04,159 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:28:04,559 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:28:04,940 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:28:05,297 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:28:05,626 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:28:05,991 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 14:28:06,295 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 14:28:06,720 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:28:07,242 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:28:07,733 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:28:08,200 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:28:08,608 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:28:09,008 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:28:09,395 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:28:09,749 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:28:10,068 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:28:10,400 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 14:28:10,760 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:28:11,323 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 14:28:11,915 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 14:28:12,472 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:28:13,009 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 14:28:13,549 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:28:14,043 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 14:28:14,504 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 14:28:14,931 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:28:15,317 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:28:15,690 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 14:28:16,027 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 14:28:16,475 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 14:28:16,735 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:28:16,992 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 14:28:17,552 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:28:18,083 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 14:28:18,595 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:28:19,084 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 14:28:19,562 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:28:20,015 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:28:20,456 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 14:28:20,868 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:28:21,249 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:28:21,580 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:28:21,845 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 14:28:22,333 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:28:22,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:28:22,888 INFO L93 Difference]: Finished difference Result 1308 states and 1759 transitions. [2020-07-21 14:28:22,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2020-07-21 14:28:22,896 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 1339 [2020-07-21 14:28:22,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:28:22,905 INFO L225 Difference]: With dead ends: 1308 [2020-07-21 14:28:22,906 INFO L226 Difference]: Without dead ends: 988 [2020-07-21 14:28:22,918 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2904 GetRequests, 2627 SyntacticMatches, 8 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32405 ImplicationChecksByTransitivity, 68.4s TimeCoverageRelationStatistics Valid=14907, Invalid=58263, Unknown=0, NotChecked=0, Total=73170 [2020-07-21 14:28:22,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 988 states. [2020-07-21 14:28:23,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 988 to 936. [2020-07-21 14:28:23,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 936 states. [2020-07-21 14:28:23,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 936 states to 936 states and 1232 transitions. [2020-07-21 14:28:23,154 INFO L78 Accepts]: Start accepts. Automaton has 936 states and 1232 transitions. Word has length 1339 [2020-07-21 14:28:23,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:28:23,155 INFO L479 AbstractCegarLoop]: Abstraction has 936 states and 1232 transitions. [2020-07-21 14:28:23,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 14:28:23,155 INFO L276 IsEmpty]: Start isEmpty. Operand 936 states and 1232 transitions. [2020-07-21 14:28:23,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1413 [2020-07-21 14:28:23,174 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:28:23,174 INFO L422 BasicCegarLoop]: trace histogram [186, 186, 186, 185, 185, 185, 185, 27, 26, 26, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:28:23,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:28:23,376 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:28:23,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:28:23,378 INFO L82 PathProgramCache]: Analyzing trace with hash 2025630034, now seen corresponding path program 52 times [2020-07-21 14:28:23,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:28:23,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1948609455] [2020-07-21 14:28:23,379 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:28:23,680 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:28:23,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:28:23,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 1586 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 14:28:23,701 INFO L286 TraceCheckSpWp]: Computing forward predicates...