/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/jm2006.c.i.v+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 20:35:50,682 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 20:35:50,685 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 20:35:50,699 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 20:35:50,699 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 20:35:50,701 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 20:35:50,702 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 20:35:50,704 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 20:35:50,706 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 20:35:50,707 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 20:35:50,708 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 20:35:50,709 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 20:35:50,710 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 20:35:50,711 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 20:35:50,712 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 20:35:50,713 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 20:35:50,714 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 20:35:50,715 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 20:35:50,717 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 20:35:50,719 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 20:35:50,720 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 20:35:50,721 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 20:35:50,723 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 20:35:50,723 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 20:35:50,728 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 20:35:50,742 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 20:35:50,743 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 20:35:50,744 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 20:35:50,745 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 20:35:50,776 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 20:35:50,776 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 20:35:50,778 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 20:35:50,778 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 20:35:50,778 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 20:35:50,779 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 20:35:50,779 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 20:35:50,779 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 20:35:50,779 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 20:35:50,779 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 20:35:50,780 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 20:35:50,781 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 20:35:50,781 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 20:35:50,781 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 20:35:50,781 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 20:35:50,782 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 20:35:50,782 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 20:35:50,782 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 20:35:50,782 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 20:35:50,782 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 20:35:50,783 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 20:35:50,783 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:35:50,783 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 20:35:50,783 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 20:35:50,783 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 20:35:50,784 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 20:35:50,784 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:50,784 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 20:35:50,784 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 20:35:50,784 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 20:35:51,092 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 20:35:51,107 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 20:35:51,111 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 20:35:51,113 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 20:35:51,113 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 20:35:51,114 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/jm2006.c.i.v+cfa-reducer.c [2020-07-21 20:35:51,181 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff9078547/09f6615c1b8b41b7897e9b163d99d43d/FLAGfb58a64a0 [2020-07-21 20:35:51,665 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 20:35:51,666 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006.c.i.v+cfa-reducer.c [2020-07-21 20:35:51,678 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff9078547/09f6615c1b8b41b7897e9b163d99d43d/FLAGfb58a64a0 [2020-07-21 20:35:52,004 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff9078547/09f6615c1b8b41b7897e9b163d99d43d [2020-07-21 20:35:52,014 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 20:35:52,017 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 20:35:52,019 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 20:35:52,019 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 20:35:52,022 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 20:35:52,024 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:35:52" (1/1) ... [2020-07-21 20:35:52,027 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39eaf402 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:52, skipping insertion in model container [2020-07-21 20:35:52,027 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:35:52" (1/1) ... [2020-07-21 20:35:52,036 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 20:35:52,058 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 20:35:52,252 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:35:52,258 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 20:35:52,279 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:35:52,295 INFO L208 MainTranslator]: Completed translation [2020-07-21 20:35:52,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:52 WrapperNode [2020-07-21 20:35:52,296 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 20:35:52,297 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 20:35:52,297 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 20:35:52,297 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 20:35:52,312 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:52" (1/1) ... [2020-07-21 20:35:52,313 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:52" (1/1) ... [2020-07-21 20:35:52,426 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:52" (1/1) ... [2020-07-21 20:35:52,426 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:52" (1/1) ... [2020-07-21 20:35:52,434 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:52" (1/1) ... [2020-07-21 20:35:52,437 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:52" (1/1) ... [2020-07-21 20:35:52,438 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:52" (1/1) ... [2020-07-21 20:35:52,446 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 20:35:52,446 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 20:35:52,446 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 20:35:52,447 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 20:35:52,448 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:52" (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 20:35:52,525 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 20:35:52,525 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 20:35:52,525 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 20:35:52,525 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 20:35:52,526 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 20:35:52,527 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 20:35:52,527 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 20:35:52,527 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 20:35:52,527 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 20:35:52,527 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 20:35:52,528 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 20:35:52,529 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 20:35:52,734 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 20:35:52,734 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 20:35:52,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:35:52 BoogieIcfgContainer [2020-07-21 20:35:52,738 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 20:35:52,740 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 20:35:52,740 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 20:35:52,744 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 20:35:52,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 08:35:52" (1/3) ... [2020-07-21 20:35:52,745 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2455c4be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:35:52, skipping insertion in model container [2020-07-21 20:35:52,746 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:52" (2/3) ... [2020-07-21 20:35:52,746 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2455c4be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:35:52, skipping insertion in model container [2020-07-21 20:35:52,746 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:35:52" (3/3) ... [2020-07-21 20:35:52,748 INFO L109 eAbstractionObserver]: Analyzing ICFG jm2006.c.i.v+cfa-reducer.c [2020-07-21 20:35:52,761 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 20:35:52,769 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 20:35:52,791 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 20:35:52,827 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 20:35:52,828 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 20:35:52,828 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 20:35:52,828 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 20:35:52,828 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 20:35:52,828 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 20:35:52,828 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 20:35:52,829 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 20:35:52,859 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-07-21 20:35:52,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 20:35:52,877 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:52,879 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:52,880 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:52,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:52,889 INFO L82 PathProgramCache]: Analyzing trace with hash -1434042835, now seen corresponding path program 1 times [2020-07-21 20:35:52,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:52,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1448435608] [2020-07-21 20:35:52,901 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 20:35:53,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:53,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:53,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 20:35:53,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:53,140 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:35:53,146 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 20:35:53,167 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 20:35:53,168 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:35:53,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1448435608] [2020-07-21 20:35:53,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:35:53,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 20:35:53,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794878263] [2020-07-21 20:35:53,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 20:35:53,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:53,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 20:35:53,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 20:35:53,193 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2020-07-21 20:35:53,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:53,346 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2020-07-21 20:35:53,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 20:35:53,348 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-07-21 20:35:53,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:53,357 INFO L225 Difference]: With dead ends: 30 [2020-07-21 20:35:53,358 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 20:35:53,361 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-21 20:35:53,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 20:35:53,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 20:35:53,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 20:35:53,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 20:35:53,397 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 20:35:53,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:53,398 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 20:35:53,398 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 20:35:53,398 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 20:35:53,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 20:35:53,399 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:53,399 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:53,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:53,601 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:53,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:53,602 INFO L82 PathProgramCache]: Analyzing trace with hash -1507594220, now seen corresponding path program 1 times [2020-07-21 20:35:53,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:53,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2106710878] [2020-07-21 20:35:53,604 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 20:35:53,641 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:53,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:53,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 20:35:53,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:53,705 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:53,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:53,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:35:53,821 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:53,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2106710878] [2020-07-21 20:35:53,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:35:53,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-21 20:35:53,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496864985] [2020-07-21 20:35:53,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 20:35:53,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:53,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 20:35:53,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 20:35:53,832 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 9 states. [2020-07-21 20:35:54,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:54,066 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2020-07-21 20:35:54,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 20:35:54,067 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 13 [2020-07-21 20:35:54,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:54,069 INFO L225 Difference]: With dead ends: 23 [2020-07-21 20:35:54,069 INFO L226 Difference]: Without dead ends: 17 [2020-07-21 20:35:54,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2020-07-21 20:35:54,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-21 20:35:54,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-21 20:35:54,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-21 20:35:54,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-07-21 20:35:54,077 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2020-07-21 20:35:54,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:54,078 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-07-21 20:35:54,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 20:35:54,078 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-07-21 20:35:54,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 20:35:54,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:54,080 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:54,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:54,295 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:54,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:54,295 INFO L82 PathProgramCache]: Analyzing trace with hash 2102853613, now seen corresponding path program 2 times [2020-07-21 20:35:54,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:54,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1383917318] [2020-07-21 20:35:54,297 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 20:35:54,341 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:54,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:54,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 20:35:54,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:54,460 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:54,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:54,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:35:54,621 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:54,622 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1383917318] [2020-07-21 20:35:54,622 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:35:54,622 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2020-07-21 20:35:54,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901370803] [2020-07-21 20:35:54,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 20:35:54,623 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:54,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 20:35:54,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2020-07-21 20:35:54,625 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 15 states. [2020-07-21 20:35:55,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:55,195 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-21 20:35:55,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 20:35:55,196 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 16 [2020-07-21 20:35:55,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:55,197 INFO L225 Difference]: With dead ends: 29 [2020-07-21 20:35:55,198 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 20:35:55,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=178, Invalid=374, Unknown=0, NotChecked=0, Total=552 [2020-07-21 20:35:55,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 20:35:55,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 20:35:55,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 20:35:55,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-07-21 20:35:55,212 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 16 [2020-07-21 20:35:55,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:55,213 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-07-21 20:35:55,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 20:35:55,213 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-07-21 20:35:55,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 20:35:55,215 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:55,215 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:55,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:55,429 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:55,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:55,430 INFO L82 PathProgramCache]: Analyzing trace with hash 906772109, now seen corresponding path program 3 times [2020-07-21 20:35:55,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:55,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1359201673] [2020-07-21 20:35:55,432 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 20:35:55,493 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:55,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:55,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 20:35:55,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:55,780 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:55,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:55,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:35:56,268 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:56,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1359201673] [2020-07-21 20:35:56,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:35:56,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 27 [2020-07-21 20:35:56,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534117114] [2020-07-21 20:35:56,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 20:35:56,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:56,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 20:35:56,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=527, Unknown=0, NotChecked=0, Total=702 [2020-07-21 20:35:56,272 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 27 states. [2020-07-21 20:35:56,921 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-07-21 20:35:57,242 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 52 [2020-07-21 20:35:58,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:58,018 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 20:35:58,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 20:35:58,020 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 22 [2020-07-21 20:35:58,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:58,021 INFO L225 Difference]: With dead ends: 41 [2020-07-21 20:35:58,021 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 20:35:58,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=550, Invalid=1172, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 20:35:58,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 20:35:58,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 20:35:58,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 20:35:58,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-07-21 20:35:58,032 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 22 [2020-07-21 20:35:58,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:58,032 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-07-21 20:35:58,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 20:35:58,033 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-07-21 20:35:58,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 20:35:58,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:58,034 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:58,248 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:58,249 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:58,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:58,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1007922227, now seen corresponding path program 4 times [2020-07-21 20:35:58,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:58,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949971667] [2020-07-21 20:35:58,252 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 20:35:58,313 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:58,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:58,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 20:35:58,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:58,967 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:58,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:59,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:36:00,424 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:36:00,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [949971667] [2020-07-21 20:36:00,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:36:00,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 51 [2020-07-21 20:36:00,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108585962] [2020-07-21 20:36:00,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-21 20:36:00,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:36:00,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-21 20:36:00,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=631, Invalid=1919, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 20:36:00,429 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 51 states. [2020-07-21 20:36:01,359 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-21 20:36:01,764 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-21 20:36:02,126 WARN L193 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 98 [2020-07-21 20:36:02,503 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 20:36:02,879 WARN L193 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 100 [2020-07-21 20:36:03,204 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-21 20:36:03,512 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 20:36:03,814 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 20:36:04,101 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 20:36:04,389 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-21 20:36:04,648 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 20:36:07,436 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-21 20:36:07,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:36:07,448 INFO L93 Difference]: Finished difference Result 65 states and 88 transitions. [2020-07-21 20:36:07,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-07-21 20:36:07,450 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 34 [2020-07-21 20:36:07,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:36:07,451 INFO L225 Difference]: With dead ends: 65 [2020-07-21 20:36:07,452 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 20:36:07,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=1942, Invalid=4064, Unknown=0, NotChecked=0, Total=6006 [2020-07-21 20:36:07,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 20:36:07,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-07-21 20:36:07,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-21 20:36:07,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-07-21 20:36:07,472 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 34 [2020-07-21 20:36:07,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:36:07,473 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-07-21 20:36:07,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-21 20:36:07,473 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-07-21 20:36:07,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-21 20:36:07,475 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:36:07,475 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:36:07,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:36:07,689 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:36:07,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:36:07,690 INFO L82 PathProgramCache]: Analyzing trace with hash -765796787, now seen corresponding path program 5 times [2020-07-21 20:36:07,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:36:07,691 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [389807876] [2020-07-21 20:36:07,692 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 20:36:07,805 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:36:07,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:36:07,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 195 conjunts are in the unsatisfiable core [2020-07-21 20:36:07,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:36:10,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:36:10,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:36:10,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:36:15,624 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:36:15,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [389807876] [2020-07-21 20:36:15,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:36:15,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 99 [2020-07-21 20:36:15,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949791298] [2020-07-21 20:36:15,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2020-07-21 20:36:15,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:36:15,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2020-07-21 20:36:15,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2407, Invalid=7295, Unknown=0, NotChecked=0, Total=9702 [2020-07-21 20:36:15,630 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 99 states. [2020-07-21 20:36:18,952 WARN L193 SmtUtils]: Spent 433.00 ms on a formula simplification that was a NOOP. DAG size: 242 [2020-07-21 20:36:20,281 WARN L193 SmtUtils]: Spent 424.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-21 20:36:21,198 WARN L193 SmtUtils]: Spent 747.00 ms on a formula simplification. DAG size of input: 240 DAG size of output: 194 [2020-07-21 20:36:22,496 WARN L193 SmtUtils]: Spent 411.00 ms on a formula simplification that was a NOOP. DAG size: 232 [2020-07-21 20:36:23,459 WARN L193 SmtUtils]: Spent 769.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 196 [2020-07-21 20:36:24,671 WARN L193 SmtUtils]: Spent 397.00 ms on a formula simplification that was a NOOP. DAG size: 227 [2020-07-21 20:36:25,863 WARN L193 SmtUtils]: Spent 392.00 ms on a formula simplification that was a NOOP. DAG size: 222 [2020-07-21 20:36:27,002 WARN L193 SmtUtils]: Spent 356.00 ms on a formula simplification that was a NOOP. DAG size: 217 [2020-07-21 20:36:28,111 WARN L193 SmtUtils]: Spent 359.00 ms on a formula simplification that was a NOOP. DAG size: 212 [2020-07-21 20:36:29,212 WARN L193 SmtUtils]: Spent 347.00 ms on a formula simplification that was a NOOP. DAG size: 207 [2020-07-21 20:36:30,261 WARN L193 SmtUtils]: Spent 332.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-07-21 20:36:31,307 WARN L193 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2020-07-21 20:36:32,310 WARN L193 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 192 [2020-07-21 20:36:33,297 WARN L193 SmtUtils]: Spent 296.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-07-21 20:36:34,281 WARN L193 SmtUtils]: Spent 293.00 ms on a formula simplification that was a NOOP. DAG size: 182 [2020-07-21 20:36:35,198 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2020-07-21 20:36:36,105 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-21 20:36:37,007 WARN L193 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 167 [2020-07-21 20:36:37,902 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 162 [2020-07-21 20:36:38,753 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 157 [2020-07-21 20:36:39,569 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 152 [2020-07-21 20:36:40,405 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 147 [2020-07-21 20:36:41,189 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 20:36:41,971 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2020-07-21 20:36:42,806 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-21 20:36:43,534 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2020-07-21 20:36:44,252 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-21 20:36:44,963 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-21 20:36:45,638 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 20:36:46,336 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-21 20:36:47,021 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 20:36:47,758 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 20:36:48,344 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 20:36:48,904 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-21 20:36:49,444 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 20:36:49,968 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 20:36:50,482 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 20:36:56,226 WARN L193 SmtUtils]: Spent 449.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-21 20:36:56,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:36:56,240 INFO L93 Difference]: Finished difference Result 113 states and 160 transitions. [2020-07-21 20:36:56,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2020-07-21 20:36:56,241 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 58 [2020-07-21 20:36:56,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:36:56,244 INFO L225 Difference]: With dead ends: 113 [2020-07-21 20:36:56,244 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 20:36:56,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1540 ImplicationChecksByTransitivity, 45.0s TimeCoverageRelationStatistics Valid=7318, Invalid=15032, Unknown=0, NotChecked=0, Total=22350 [2020-07-21 20:36:56,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 20:36:56,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2020-07-21 20:36:56,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-21 20:36:56,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-07-21 20:36:56,285 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 58 [2020-07-21 20:36:56,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:36:56,288 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-07-21 20:36:56,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 99 states. [2020-07-21 20:36:56,288 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-07-21 20:36:56,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 20:36:56,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:36:56,300 INFO L422 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:36:56,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:36:56,501 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:36:56,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:36:56,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1152480077, now seen corresponding path program 6 times [2020-07-21 20:36:56,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:36:56,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983246012] [2020-07-21 20:36:56,503 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 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 20:36:56,702 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:36:56,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:36:56,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 387 conjunts are in the unsatisfiable core [2020-07-21 20:36:56,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:37:05,687 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:37:05,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:37:05,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:37:35,870 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:37:35,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [983246012] [2020-07-21 20:37:35,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:37:35,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99] total 195 [2020-07-21 20:37:35,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792714284] [2020-07-21 20:37:35,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 195 states [2020-07-21 20:37:35,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:37:35,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 195 interpolants. [2020-07-21 20:37:35,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9415, Invalid=28415, Unknown=0, NotChecked=0, Total=37830 [2020-07-21 20:37:35,885 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 195 states. [2020-07-21 20:37:59,373 WARN L193 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 482 [2020-07-21 20:38:11,236 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification that was a NOOP. DAG size: 477 [2020-07-21 20:38:15,356 WARN L193 SmtUtils]: Spent 3.41 s on a formula simplification. DAG size of input: 480 DAG size of output: 386 [2020-07-21 20:38:27,618 WARN L193 SmtUtils]: Spent 1.92 s on a formula simplification that was a NOOP. DAG size: 472 [2020-07-21 20:38:31,789 WARN L193 SmtUtils]: Spent 3.46 s on a formula simplification. DAG size of input: 482 DAG size of output: 388 [2020-07-21 20:38:47,324 WARN L193 SmtUtils]: Spent 2.55 s on a formula simplification that was a NOOP. DAG size: 467 [2020-07-21 20:39:04,187 WARN L193 SmtUtils]: Spent 2.60 s on a formula simplification that was a NOOP. DAG size: 462 [2020-07-21 20:39:21,308 WARN L193 SmtUtils]: Spent 2.69 s on a formula simplification that was a NOOP. DAG size: 457 [2020-07-21 20:39:39,289 WARN L193 SmtUtils]: Spent 2.80 s on a formula simplification that was a NOOP. DAG size: 452 [2020-07-21 20:39:59,032 WARN L193 SmtUtils]: Spent 3.03 s on a formula simplification that was a NOOP. DAG size: 447 [2020-07-21 20:40:19,586 WARN L193 SmtUtils]: Spent 3.07 s on a formula simplification that was a NOOP. DAG size: 442 [2020-07-21 20:40:40,469 WARN L193 SmtUtils]: Spent 2.81 s on a formula simplification that was a NOOP. DAG size: 437 [2020-07-21 20:41:02,669 WARN L193 SmtUtils]: Spent 3.22 s on a formula simplification that was a NOOP. DAG size: 432 [2020-07-21 20:41:25,192 WARN L193 SmtUtils]: Spent 3.46 s on a formula simplification that was a NOOP. DAG size: 427 [2020-07-21 20:41:49,419 WARN L193 SmtUtils]: Spent 3.47 s on a formula simplification that was a NOOP. DAG size: 422 [2020-07-21 20:42:14,590 WARN L193 SmtUtils]: Spent 3.58 s on a formula simplification that was a NOOP. DAG size: 417 [2020-07-21 20:42:40,563 WARN L193 SmtUtils]: Spent 3.68 s on a formula simplification that was a NOOP. DAG size: 412 [2020-07-21 20:43:06,857 WARN L193 SmtUtils]: Spent 3.75 s on a formula simplification that was a NOOP. DAG size: 407 [2020-07-21 20:43:34,000 WARN L193 SmtUtils]: Spent 3.75 s on a formula simplification that was a NOOP. DAG size: 402 [2020-07-21 20:44:01,517 WARN L193 SmtUtils]: Spent 3.83 s on a formula simplification that was a NOOP. DAG size: 397 [2020-07-21 20:44:29,892 WARN L193 SmtUtils]: Spent 3.91 s on a formula simplification that was a NOOP. DAG size: 392 [2020-07-21 20:44:58,528 WARN L193 SmtUtils]: Spent 3.88 s on a formula simplification that was a NOOP. DAG size: 387 [2020-07-21 20:45:27,617 WARN L193 SmtUtils]: Spent 3.96 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-21 20:45:56,629 WARN L193 SmtUtils]: Spent 3.83 s on a formula simplification that was a NOOP. DAG size: 377 [2020-07-21 20:46:26,321 WARN L193 SmtUtils]: Spent 4.05 s on a formula simplification that was a NOOP. DAG size: 372 [2020-07-21 20:46:55,789 WARN L193 SmtUtils]: Spent 3.59 s on a formula simplification that was a NOOP. DAG size: 367 [2020-07-21 20:47:20,637 WARN L193 SmtUtils]: Spent 3.40 s on a formula simplification that was a NOOP. DAG size: 362 [2020-07-21 20:47:46,042 WARN L193 SmtUtils]: Spent 3.45 s on a formula simplification that was a NOOP. DAG size: 357 [2020-07-21 20:48:11,435 WARN L193 SmtUtils]: Spent 3.34 s on a formula simplification that was a NOOP. DAG size: 352 [2020-07-21 20:48:36,908 WARN L193 SmtUtils]: Spent 3.39 s on a formula simplification that was a NOOP. DAG size: 347 [2020-07-21 20:49:02,838 WARN L193 SmtUtils]: Spent 3.55 s on a formula simplification that was a NOOP. DAG size: 342 [2020-07-21 20:49:29,242 WARN L193 SmtUtils]: Spent 3.59 s on a formula simplification that was a NOOP. DAG size: 337 [2020-07-21 20:49:52,148 WARN L193 SmtUtils]: Spent 2.85 s on a formula simplification that was a NOOP. DAG size: 332 [2020-07-21 20:50:09,899 WARN L193 SmtUtils]: Spent 2.61 s on a formula simplification that was a NOOP. DAG size: 327