/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_20-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:21:10,200 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:21:10,203 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:21:10,220 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:21:10,221 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:21:10,222 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:21:10,224 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:21:10,237 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:21:10,239 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:21:10,241 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:21:10,242 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:21:10,245 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:21:10,246 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:21:10,246 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:21:10,250 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:21:10,251 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:21:10,251 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:21:10,254 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:21:10,255 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:21:10,262 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:21:10,266 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:21:10,269 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:21:10,271 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:21:10,272 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:21:10,277 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:21:10,287 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:21:10,288 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:21:10,289 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:21:10,290 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:21:10,316 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:21:10,316 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:21:10,318 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:21:10,319 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:21:10,319 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:21:10,319 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:21:10,320 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:21:10,320 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:21:10,320 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:21:10,320 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:21:10,321 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:21:10,321 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:21:10,322 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:21:10,322 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:21:10,322 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:21:10,323 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:21:10,323 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:21:10,323 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:21:10,323 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:21:10,323 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:21:10,324 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:21:10,324 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:10,324 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:21:10,325 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:21:10,325 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:21:10,325 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:21:10,326 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:10,326 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:21:10,326 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:21:10,326 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 -> 4 [2020-07-20 13:21:10,646 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:21:10,669 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:21:10,673 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:21:10,675 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:21:10,677 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:21:10,678 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_20-1.c [2020-07-20 13:21:10,753 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/64c568f63/ff311660b9204fb58be0bb26a85129e0/FLAG302428228 [2020-07-20 13:21:11,227 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:21:11,228 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_20-1.c [2020-07-20 13:21:11,233 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/64c568f63/ff311660b9204fb58be0bb26a85129e0/FLAG302428228 [2020-07-20 13:21:11,595 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/64c568f63/ff311660b9204fb58be0bb26a85129e0 [2020-07-20 13:21:11,604 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:21:11,608 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:21:11,609 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:11,610 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:21:11,613 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:21:11,614 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:11" (1/1) ... [2020-07-20 13:21:11,619 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20a42054 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:11, skipping insertion in model container [2020-07-20 13:21:11,619 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:11" (1/1) ... [2020-07-20 13:21:11,628 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:21:11,644 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:21:11,827 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:11,831 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:21:11,848 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:11,863 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:21:11,863 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:11 WrapperNode [2020-07-20 13:21:11,864 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:11,864 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:21:11,864 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:21:11,865 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:21:11,878 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:11" (1/1) ... [2020-07-20 13:21:11,879 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:11" (1/1) ... [2020-07-20 13:21:11,884 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:11" (1/1) ... [2020-07-20 13:21:11,884 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:11" (1/1) ... [2020-07-20 13:21:11,888 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:11" (1/1) ... [2020-07-20 13:21:11,891 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:11" (1/1) ... [2020-07-20 13:21:11,892 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:11" (1/1) ... [2020-07-20 13:21:11,893 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:21:11,894 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:21:11,894 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:21:11,894 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:21:11,895 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:11" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:12,041 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:21:12,041 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:21:12,041 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 13:21:12,041 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:21:12,041 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:21:12,041 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:21:12,042 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 13:21:12,042 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:21:12,042 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:21:12,042 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:21:12,217 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:21:12,218 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:21:12,222 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:12 BoogieIcfgContainer [2020-07-20 13:21:12,223 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:21:12,224 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:21:12,225 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:21:12,228 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:21:12,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:21:11" (1/3) ... [2020-07-20 13:21:12,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75fef767 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:12, skipping insertion in model container [2020-07-20 13:21:12,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:11" (2/3) ... [2020-07-20 13:21:12,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75fef767 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:12, skipping insertion in model container [2020-07-20 13:21:12,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:12" (3/3) ... [2020-07-20 13:21:12,233 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_20-1.c [2020-07-20 13:21:12,246 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:21:12,254 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:21:12,271 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:21:12,307 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:21:12,308 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:21:12,308 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:21:12,308 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:21:12,309 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:21:12,309 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:21:12,310 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:21:12,310 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:21:12,338 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 13:21:12,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:21:12,348 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:12,350 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:12,350 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:12,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:12,359 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 13:21:12,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:12,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [272095333] [2020-07-20 13:21:12,372 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:12,443 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:12,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:12,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:12,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:12,538 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:21:12,539 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:12,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [272095333] [2020-07-20 13:21:12,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:12,541 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:12,542 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356621031] [2020-07-20 13:21:12,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:12,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:12,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:12,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:12,565 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 13:21:12,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:12,654 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 13:21:12,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:12,656 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:21:12,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:12,667 INFO L225 Difference]: With dead ends: 35 [2020-07-20 13:21:12,667 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 13:21:12,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:21:12,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 13:21:12,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 13:21:12,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:21:12,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:21:12,714 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 13:21:12,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:12,715 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:21:12,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:12,716 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:21:12,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:21:12,718 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:12,718 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:12,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:12,933 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:12,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:12,934 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 13:21:12,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:12,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403160973] [2020-07-20 13:21:12,936 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:12,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:12,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:12,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:12,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:13,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:21:13,006 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:13,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1403160973] [2020-07-20 13:21:13,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:13,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:13,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031449108] [2020-07-20 13:21:13,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:13,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:13,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:13,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:13,015 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 13:21:13,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:13,087 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 13:21:13,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:13,087 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:21:13,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:13,089 INFO L225 Difference]: With dead ends: 27 [2020-07-20 13:21:13,089 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 13:21:13,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:21:13,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 13:21:13,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 13:21:13,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:21:13,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:21:13,099 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 13:21:13,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:13,100 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:21:13,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:13,100 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:21:13,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:21:13,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:13,102 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:13,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:13,315 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:13,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:13,317 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 13:21:13,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:13,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [478142947] [2020-07-20 13:21:13,318 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:13,351 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:13,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:13,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:13,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:13,405 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:21:13,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:13,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:13,611 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:21:13,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [478142947] [2020-07-20 13:21:13,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:13,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:21:13,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580277088] [2020-07-20 13:21:13,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:21:13,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:13,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:21:13,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:21:13,615 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 13:21:13,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:13,757 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 13:21:13,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:21:13,758 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 13:21:13,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:13,761 INFO L225 Difference]: With dead ends: 32 [2020-07-20 13:21:13,762 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 13:21:13,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:13,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 13:21:13,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 13:21:13,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:21:13,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:21:13,783 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 13:21:13,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:13,784 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:21:13,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:21:13,784 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:21:13,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:21:13,789 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:13,789 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:13,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:13,999 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:13,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:13,999 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 13:21:14,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:14,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1630827865] [2020-07-20 13:21:14,001 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:14,033 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:14,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:14,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:14,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:14,086 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:21:14,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:14,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:14,273 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:21:14,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1630827865] [2020-07-20 13:21:14,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:14,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:21:14,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233757931] [2020-07-20 13:21:14,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:21:14,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:14,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:21:14,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:21:14,275 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 13:21:14,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:14,354 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 13:21:14,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:21:14,354 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 13:21:14,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:14,357 INFO L225 Difference]: With dead ends: 37 [2020-07-20 13:21:14,357 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 13:21:14,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:14,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 13:21:14,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 13:21:14,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:21:14,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:21:14,367 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 13:21:14,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:14,368 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:21:14,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:21:14,368 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:21:14,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:21:14,370 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:14,370 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:14,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:14,584 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:14,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:14,584 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 13:21:14,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:14,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [198275712] [2020-07-20 13:21:14,585 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:14,642 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:14,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:14,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:14,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:14,697 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 13:21:14,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:14,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:14,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:14,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:14,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,035 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:21:15,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [198275712] [2020-07-20 13:21:15,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:15,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:21:15,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431655378] [2020-07-20 13:21:15,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:21:15,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:15,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:21:15,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:15,038 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 13:21:15,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:15,191 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 13:21:15,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:15,192 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 13:21:15,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:15,196 INFO L225 Difference]: With dead ends: 42 [2020-07-20 13:21:15,196 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 13:21:15,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:15,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 13:21:15,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 13:21:15,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:21:15,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:21:15,208 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 13:21:15,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:15,209 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:21:15,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:21:15,209 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:21:15,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 13:21:15,211 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:15,211 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:15,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:15,419 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:15,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:15,420 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 13:21:15,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:15,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [820254342] [2020-07-20 13:21:15,421 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:15,453 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:15,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:15,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:15,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:15,518 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 13:21:15,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:15,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,830 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:21:15,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [820254342] [2020-07-20 13:21:15,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:15,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:21:15,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220815317] [2020-07-20 13:21:15,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:21:15,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:15,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:21:15,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:15,833 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 13:21:15,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:15,972 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 13:21:15,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:15,973 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 13:21:15,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:15,975 INFO L225 Difference]: With dead ends: 47 [2020-07-20 13:21:15,975 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 13:21:15,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:15,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 13:21:15,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 13:21:15,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:21:15,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:21:15,986 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 13:21:15,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:15,987 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:21:15,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:21:15,987 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:21:15,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 13:21:15,989 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:15,990 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:16,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:16,203 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:16,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:16,206 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 13:21:16,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:16,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688582932] [2020-07-20 13:21:16,207 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:16,248 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:16,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:16,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:16,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:16,299 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 13:21:16,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:16,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,938 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 13:21:16,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688582932] [2020-07-20 13:21:16,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:16,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:21:16,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294098233] [2020-07-20 13:21:16,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:21:16,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:16,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:21:16,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:21:16,941 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 13:21:17,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:17,109 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 13:21:17,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:17,110 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 13:21:17,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:17,113 INFO L225 Difference]: With dead ends: 52 [2020-07-20 13:21:17,113 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 13:21:17,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:17,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 13:21:17,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 13:21:17,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:21:17,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:21:17,126 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 13:21:17,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:17,126 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:21:17,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:21:17,127 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:21:17,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 13:21:17,129 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:17,129 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:17,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:17,332 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:17,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:17,333 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 13:21:17,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:17,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1992981248] [2020-07-20 13:21:17,334 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:21:17,401 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:17,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:17,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:17,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:17,488 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 13:21:17,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:17,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:17,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:17,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,083 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 13:21:18,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1992981248] [2020-07-20 13:21:18,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:18,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:21:18,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144192242] [2020-07-20 13:21:18,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:21:18,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:18,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:21:18,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:21:18,086 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 13:21:18,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:18,223 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 13:21:18,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:18,225 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 13:21:18,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:18,227 INFO L225 Difference]: With dead ends: 57 [2020-07-20 13:21:18,227 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 13:21:18,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:18,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 13:21:18,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 13:21:18,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:21:18,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:21:18,243 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 13:21:18,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:18,243 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:21:18,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:21:18,244 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:21:18,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 13:21:18,246 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:18,247 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:18,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:18,463 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:18,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:18,463 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 13:21:18,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:18,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1398383947] [2020-07-20 13:21:18,465 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:21:18,537 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:18,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:18,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:18,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:18,654 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 13:21:18,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:19,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,566 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 13:21:19,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1398383947] [2020-07-20 13:21:19,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:19,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 13:21:19,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316546118] [2020-07-20 13:21:19,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:21:19,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:19,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:21:19,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:19,570 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 13:21:19,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:19,869 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 13:21:19,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:19,870 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 13:21:19,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:19,872 INFO L225 Difference]: With dead ends: 62 [2020-07-20 13:21:19,872 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 13:21:19,875 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:19,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 13:21:19,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 13:21:19,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:21:19,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:21:19,888 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 13:21:19,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:19,888 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:21:19,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:21:19,888 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:21:19,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 13:21:19,891 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:19,892 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:20,096 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:20,097 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:20,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:20,098 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 13:21:20,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:20,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1973964649] [2020-07-20 13:21:20,100 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:21:20,190 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:20,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:20,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:20,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:20,283 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 13:21:20,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:20,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 13:21:21,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1973964649] [2020-07-20 13:21:21,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:21,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 13:21:21,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067221939] [2020-07-20 13:21:21,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:21:21,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:21,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:21:21,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:21,376 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 13:21:21,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:21,538 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 13:21:21,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:21,538 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 13:21:21,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:21,541 INFO L225 Difference]: With dead ends: 67 [2020-07-20 13:21:21,541 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 13:21:21,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:21,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 13:21:21,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 13:21:21,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:21:21,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:21:21,554 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 13:21:21,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:21,555 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:21:21,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:21:21,555 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:21:21,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 13:21:21,559 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:21,560 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:21,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:21,774 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:21,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:21,775 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 13:21:21,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:21,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202841792] [2020-07-20 13:21:21,776 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:21:21,892 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:21,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:21,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 524 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:21,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:22,020 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 13:21:22,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:23,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,911 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 13:21:23,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [202841792] [2020-07-20 13:21:23,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:23,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 13:21:23,913 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376003650] [2020-07-20 13:21:23,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:21:23,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:23,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:21:23,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:23,917 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 13:21:24,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:24,123 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 13:21:24,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:24,124 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 13:21:24,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:24,128 INFO L225 Difference]: With dead ends: 72 [2020-07-20 13:21:24,128 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 13:21:24,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:21:24,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 13:21:24,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 13:21:24,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 13:21:24,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 13:21:24,158 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 13:21:24,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:24,159 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 13:21:24,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:21:24,160 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 13:21:24,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 13:21:24,166 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:24,167 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:24,380 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:24,381 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:24,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:24,382 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-20 13:21:24,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:24,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [985563393] [2020-07-20 13:21:24,383 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:21:24,517 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:24,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:24,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:24,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:24,690 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-20 13:21:24,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:25,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:26,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:26,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:26,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:26,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:26,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:26,534 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-20 13:21:26,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [985563393] [2020-07-20 13:21:26,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:26,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 13:21:26,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922901570] [2020-07-20 13:21:26,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:21:26,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:26,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:21:26,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:26,537 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 13:21:26,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:26,742 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 13:21:26,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:26,743 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-20 13:21:26,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:26,763 INFO L225 Difference]: With dead ends: 77 [2020-07-20 13:21:26,763 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 13:21:26,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:21:26,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 13:21:26,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 13:21:26,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 13:21:26,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 13:21:26,790 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-20 13:21:26,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:26,794 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 13:21:26,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:21:26,795 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 13:21:26,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 13:21:26,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:26,813 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:27,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:27,026 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:27,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:27,027 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-20 13:21:27,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:27,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2096196077] [2020-07-20 13:21:27,028 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:21:27,217 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:27,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:27,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 925 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:27,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:27,419 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-20 13:21:27,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:29,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:29,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:30,644 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-20 13:21:30,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2096196077] [2020-07-20 13:21:30,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:30,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 13:21:30,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510135456] [2020-07-20 13:21:30,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:21:30,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:30,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:21:30,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:21:30,647 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 13:21:31,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:31,098 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 13:21:31,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:31,098 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-20 13:21:31,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:31,102 INFO L225 Difference]: With dead ends: 82 [2020-07-20 13:21:31,102 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 13:21:31,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:21:31,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 13:21:31,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 13:21:31,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 13:21:31,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 13:21:31,115 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-20 13:21:31,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:31,116 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 13:21:31,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:21:31,117 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 13:21:31,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 13:21:31,120 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:31,120 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:31,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:31,336 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:31,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:31,337 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 13:21:31,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:31,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388723732] [2020-07-20 13:21:31,338 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:21:31,519 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:31,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:31,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 818 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:31,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:31,707 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 13:21:31,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:33,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:34,737 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 13:21:34,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1388723732] [2020-07-20 13:21:34,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:34,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 13:21:34,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408277934] [2020-07-20 13:21:34,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:21:34,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:34,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:21:34,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:21:34,740 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 13:21:34,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:34,991 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 13:21:34,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:34,991 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 13:21:34,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:34,995 INFO L225 Difference]: With dead ends: 87 [2020-07-20 13:21:34,995 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 13:21:34,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:21:34,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 13:21:35,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 13:21:35,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 13:21:35,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 13:21:35,025 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 13:21:35,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:35,026 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 13:21:35,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:21:35,026 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 13:21:35,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-20 13:21:35,037 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:35,037 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:35,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:35,251 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:35,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:35,252 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-20 13:21:35,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:35,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [269476134] [2020-07-20 13:21:35,253 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:21:35,675 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:35,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:35,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 1941 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:21:35,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:36,257 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-20 13:21:36,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:39,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:39,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:41,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:41,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:41,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:42,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:42,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:42,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:42,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:42,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:42,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:42,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:42,860 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-20 13:21:42,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [269476134] [2020-07-20 13:21:42,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:42,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 13:21:42,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047224599] [2020-07-20 13:21:42,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:21:42,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:42,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:21:42,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:42,864 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 13:21:43,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:43,414 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 13:21:43,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:21:43,415 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-20 13:21:43,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:43,419 INFO L225 Difference]: With dead ends: 92 [2020-07-20 13:21:43,420 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 13:21:43,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:21:43,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 13:21:43,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 13:21:43,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 13:21:43,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 13:21:43,434 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-20 13:21:43,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:43,436 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 13:21:43,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:21:43,436 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 13:21:43,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 657 [2020-07-20 13:21:43,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:43,442 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 79, 47, 47, 47, 47, 47, 47, 47, 32, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:43,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:43,657 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:43,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:43,658 INFO L82 PathProgramCache]: Analyzing trace with hash -312379166, now seen corresponding path program 7 times [2020-07-20 13:21:43,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:43,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [765238993] [2020-07-20 13:21:43,659 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:21:43,933 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:43,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:43,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 1186 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:21:43,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:44,209 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3394 refuted. 0 times theorem prover too weak. 21370 trivial. 0 not checked. [2020-07-20 13:21:44,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:46,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,915 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3471 refuted. 0 times theorem prover too weak. 21293 trivial. 0 not checked. [2020-07-20 13:21:48,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [765238993] [2020-07-20 13:21:48,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:48,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 13:21:48,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050429117] [2020-07-20 13:21:48,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:21:48,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:48,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:21:48,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:48,918 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 13:21:49,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:49,439 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 13:21:49,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:21:49,440 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 656 [2020-07-20 13:21:49,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:49,445 INFO L225 Difference]: With dead ends: 97 [2020-07-20 13:21:49,445 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 13:21:49,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1319 GetRequests, 1276 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:21:49,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 13:21:49,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 13:21:49,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 13:21:49,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 13:21:49,461 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 656 [2020-07-20 13:21:49,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:49,462 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 13:21:49,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:21:49,462 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 13:21:49,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1275 [2020-07-20 13:21:49,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:49,478 INFO L422 BasicCegarLoop]: trace histogram [195, 195, 98, 97, 97, 97, 97, 97, 97, 97, 97, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:49,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:49,692 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:49,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:49,693 INFO L82 PathProgramCache]: Analyzing trace with hash 971855614, now seen corresponding path program 8 times [2020-07-20 13:21:49,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:49,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1895994362] [2020-07-20 13:21:49,694 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:21:50,183 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:50,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:50,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 2318 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:21:50,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:51,078 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7570 refuted. 0 times theorem prover too weak. 90202 trivial. 0 not checked. [2020-07-20 13:21:51,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:55,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:59,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:59,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:59,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:59,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:59,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:59,866 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7662 refuted. 0 times theorem prover too weak. 90110 trivial. 0 not checked. [2020-07-20 13:21:59,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1895994362] [2020-07-20 13:21:59,867 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:59,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 13:21:59,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782556075] [2020-07-20 13:21:59,869 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:21:59,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:59,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:21:59,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:21:59,870 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 13:22:00,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:00,626 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 13:22:00,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:00,627 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1274 [2020-07-20 13:22:00,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:00,632 INFO L225 Difference]: With dead ends: 102 [2020-07-20 13:22:00,633 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 13:22:00,634 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2557 GetRequests, 2509 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:00,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 13:22:00,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 13:22:00,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 13:22:00,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 13:22:00,651 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1274 [2020-07-20 13:22:00,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:00,653 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 13:22:00,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:00,653 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 13:22:00,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1821 [2020-07-20 13:22:00,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:00,687 INFO L422 BasicCegarLoop]: trace histogram [267, 267, 211, 133, 133, 133, 133, 133, 133, 133, 78, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:00,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:00,902 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:00,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:00,903 INFO L82 PathProgramCache]: Analyzing trace with hash 1926911020, now seen corresponding path program 8 times [2020-07-20 13:22:00,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:00,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [480015967] [2020-07-20 13:22:00,905 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:22:01,551 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:01,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:01,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 3288 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:01,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:02,828 INFO L134 CoverageAnalysis]: Checked inductivity of 199311 backedges. 1523 proven. 11417 refuted. 0 times theorem prover too weak. 186371 trivial. 0 not checked. [2020-07-20 13:22:02,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:09,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:12,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:12,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:12,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:14,836 INFO L134 CoverageAnalysis]: Checked inductivity of 199311 backedges. 1523 proven. 11517 refuted. 0 times theorem prover too weak. 186271 trivial. 0 not checked. [2020-07-20 13:22:14,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [480015967] [2020-07-20 13:22:14,836 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:14,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 13:22:14,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67352729] [2020-07-20 13:22:14,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:22:14,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:14,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:22:14,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:22:14,840 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 13:22:15,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:15,548 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 13:22:15,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:15,549 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1820 [2020-07-20 13:22:15,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:15,557 INFO L225 Difference]: With dead ends: 107 [2020-07-20 13:22:15,557 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 13:22:15,558 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3648 GetRequests, 3600 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:15,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 13:22:15,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 13:22:15,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 13:22:15,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 13:22:15,578 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1820 [2020-07-20 13:22:15,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:15,581 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 13:22:15,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:15,581 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 13:22:15,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2029 [2020-07-20 13:22:15,614 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:15,615 INFO L422 BasicCegarLoop]: trace histogram [311, 311, 156, 155, 155, 155, 155, 155, 155, 155, 155, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:15,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:15,829 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:15,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:15,830 INFO L82 PathProgramCache]: Analyzing trace with hash -2013442466, now seen corresponding path program 9 times [2020-07-20 13:22:15,830 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:15,830 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839828187] [2020-07-20 13:22:15,830 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:22:16,615 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:16,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:16,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 3683 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:22:16,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:18,394 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13739 refuted. 0 times theorem prover too weak. 236697 trivial. 0 not checked. [2020-07-20 13:22:18,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:25,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:28,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,408 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:22:30,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:31,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:31,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:32,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:32,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:32,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:32,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:32,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:32,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:32,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:34,144 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13856 refuted. 0 times theorem prover too weak. 236580 trivial. 0 not checked. [2020-07-20 13:22:34,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839828187] [2020-07-20 13:22:34,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:34,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 13:22:34,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954598107] [2020-07-20 13:22:34,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:22:34,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:34,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:22:34,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:22:34,148 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 13:22:35,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:35,243 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 13:22:35,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:22:35,249 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2028 [2020-07-20 13:22:35,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:35,256 INFO L225 Difference]: With dead ends: 112 [2020-07-20 13:22:35,257 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 13:22:35,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4066 GetRequests, 4013 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:22:35,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 13:22:35,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 13:22:35,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 13:22:35,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 13:22:35,278 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2028 [2020-07-20 13:22:35,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:35,281 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 13:22:35,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:22:35,281 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 13:22:35,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3145 [2020-07-20 13:22:35,381 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:35,382 INFO L422 BasicCegarLoop]: trace histogram [461, 461, 371, 230, 230, 230, 230, 230, 230, 230, 141, 90, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:35,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:35,596 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:35,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:35,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1076189233, now seen corresponding path program 9 times [2020-07-20 13:22:35,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:35,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941231755] [2020-07-20 13:22:35,599 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:22:36,650 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:36,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:36,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 5676 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:22:36,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:41,457 INFO L134 CoverageAnalysis]: Checked inductivity of 598095 backedges. 3029 proven. 22265 refuted. 0 times theorem prover too weak. 572801 trivial. 0 not checked. [2020-07-20 13:22:41,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:50,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:56,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:59,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:59,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:00,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:01,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:01,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:01,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:01,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:01,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:01,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:01,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:05,442 INFO L134 CoverageAnalysis]: Checked inductivity of 598095 backedges. 3029 proven. 22391 refuted. 0 times theorem prover too weak. 572675 trivial. 0 not checked. [2020-07-20 13:23:05,443 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941231755] [2020-07-20 13:23:05,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:05,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 13:23:05,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557249610] [2020-07-20 13:23:05,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:23:05,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:05,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:23:05,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:23:05,447 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 13:23:06,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:06,320 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 13:23:06,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:23:06,321 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3144 [2020-07-20 13:23:06,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:06,329 INFO L225 Difference]: With dead ends: 117 [2020-07-20 13:23:06,330 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 13:23:06,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6297 GetRequests, 6244 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:23:06,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 13:23:06,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 13:23:06,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 13:23:06,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 13:23:06,349 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3144 [2020-07-20 13:23:06,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:06,352 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 13:23:06,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:23:06,352 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 13:23:06,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-20 13:23:06,451 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:06,452 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:06,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:06,655 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:06,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:06,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-20 13:23:06,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:06,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607404338] [2020-07-20 13:23:06,658 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:23:08,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:08,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:08,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 7224 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 13:23:08,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:13,369 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30795 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-20 13:23:13,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:28,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:28,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:35,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:38,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:40,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:41,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:42,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:42,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:42,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:43,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:43,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:43,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:48,727 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30940 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-20 13:23:48,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607404338] [2020-07-20 13:23:48,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:48,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 13:23:48,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927402547] [2020-07-20 13:23:48,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 13:23:48,732 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:48,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 13:23:48,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:23:48,732 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 13:23:49,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:49,874 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 13:23:49,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:23:49,875 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-20 13:23:49,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:49,884 INFO L225 Difference]: With dead ends: 122 [2020-07-20 13:23:49,884 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 13:23:49,886 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 13:23:49,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 13:23:49,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 13:23:49,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 13:23:49,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 13:23:49,905 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-20 13:23:49,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:49,909 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 13:23:49,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 13:23:49,909 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 13:23:50,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3877 [2020-07-20 13:23:50,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:50,012 INFO L422 BasicCegarLoop]: trace histogram [569, 569, 455, 284, 284, 284, 284, 284, 284, 284, 171, 114, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:50,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:50,213 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:50,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:50,216 INFO L82 PathProgramCache]: Analyzing trace with hash -1124129157, now seen corresponding path program 10 times [2020-07-20 13:23:50,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:50,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [391044200] [2020-07-20 13:23:50,217 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:23:51,550 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:51,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:51,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 6997 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 13:23:51,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:56,672 INFO L134 CoverageAnalysis]: Checked inductivity of 910413 backedges. 3902 proven. 30601 refuted. 0 times theorem prover too weak. 875910 trivial. 0 not checked. [2020-07-20 13:23:56,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:10,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:14,472 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:24:18,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:18,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:22,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:22,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:24,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:24,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:25,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:25,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:26,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:26,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:26,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:27,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:27,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:27,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:27,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:27,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:32,617 INFO L134 CoverageAnalysis]: Checked inductivity of 910413 backedges. 3902 proven. 30756 refuted. 0 times theorem prover too weak. 875755 trivial. 0 not checked. [2020-07-20 13:24:32,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [391044200] [2020-07-20 13:24:32,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:32,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 13:24:32,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538627054] [2020-07-20 13:24:32,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 13:24:32,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:32,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 13:24:32,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:24:32,622 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 13:24:34,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:34,300 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 13:24:34,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:24:34,302 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3876 [2020-07-20 13:24:34,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:34,311 INFO L225 Difference]: With dead ends: 127 [2020-07-20 13:24:34,311 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 13:24:34,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7762 GetRequests, 7704 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 13:24:34,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 13:24:34,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 13:24:34,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 13:24:34,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 13:24:34,339 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3876 [2020-07-20 13:24:34,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:34,342 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 13:24:34,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 13:24:34,342 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 13:24:35,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14041 [2020-07-20 13:24:35,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:35,432 INFO L422 BasicCegarLoop]: trace histogram [2159, 2159, 1080, 1079, 1079, 1079, 1079, 1079, 1079, 1079, 1079, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:35,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:35,633 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:35,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:35,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1760661492, now seen corresponding path program 11 times [2020-07-20 13:24:35,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:35,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066098767] [2020-07-20 13:24:35,639 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:24:39,838 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:39,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:39,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 25475 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 13:24:40,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:25:40,234 INFO L134 CoverageAnalysis]: Checked inductivity of 12226149 backedges. 13193 proven. 123136 refuted. 0 times theorem prover too weak. 12089820 trivial. 0 not checked. [2020-07-20 13:25:40,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:20,327 WARN L193 SmtUtils]: Spent 757.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:26:56,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:24,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:32,300 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:27:35,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:35,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:45,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:45,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:52,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:55,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:55,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:56,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:56,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:57,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:57,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:57,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:57,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:57,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:07,037 INFO L134 CoverageAnalysis]: Checked inductivity of 12226149 backedges. 13193 proven. 123312 refuted. 0 times theorem prover too weak. 12089644 trivial. 0 not checked. [2020-07-20 13:29:07,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066098767] [2020-07-20 13:29:07,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:29:07,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 13:29:07,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793475002] [2020-07-20 13:29:07,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 13:29:07,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:29:07,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 13:29:07,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:29:07,052 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 13:29:08,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:29:08,903 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 13:29:08,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 13:29:08,905 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 14040 [2020-07-20 13:29:08,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:29:08,925 INFO L225 Difference]: With dead ends: 132 [2020-07-20 13:29:08,925 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 13:29:08,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28092 GetRequests, 28029 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 13:29:08,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 13:29:08,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 13:29:08,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 13:29:08,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 13:29:08,952 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 14040 [2020-07-20 13:29:08,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:29:08,960 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 13:29:08,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 13:29:08,960 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 13:29:09,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5621 [2020-07-20 13:29:09,203 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:29:09,205 INFO L422 BasicCegarLoop]: trace histogram [825, 825, 663, 412, 412, 412, 412, 412, 412, 412, 251, 162, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:29:09,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:29:09,407 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:29:09,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:29:09,409 INFO L82 PathProgramCache]: Analyzing trace with hash -320484569, now seen corresponding path program 11 times [2020-07-20 13:29:09,410 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:29:09,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1706153353] [2020-07-20 13:29:09,410 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:29:11,610 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:29:11,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:29:11,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 10142 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 13:29:11,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:29:27,761 INFO L134 CoverageAnalysis]: Checked inductivity of 1917717 backedges. 5294 proven. 49727 refuted. 0 times theorem prover too weak. 1862696 trivial. 0 not checked. [2020-07-20 13:29:27,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:29:58,488 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:29:58,600 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:29:59,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:59,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:12,084 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:30:12,193 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:30:13,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:25,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:25,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:30,241 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:30:30,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:30,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:35,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:35,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:37,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:37,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:38,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:39,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:39,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:39,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:40,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:40,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:40,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:50,988 INFO L134 CoverageAnalysis]: Checked inductivity of 1917717 backedges. 5294 proven. 49914 refuted. 0 times theorem prover too weak. 1862509 trivial. 0 not checked. [2020-07-20 13:30:50,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1706153353] [2020-07-20 13:30:50,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:30:50,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 13:30:50,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422856401] [2020-07-20 13:30:50,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 13:30:50,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:30:50,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 13:30:50,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:30:50,998 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 13:30:54,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:30:54,301 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 13:30:54,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 13:30:54,305 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 5620 [2020-07-20 13:30:54,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:30:54,313 INFO L225 Difference]: With dead ends: 137 [2020-07-20 13:30:54,313 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 13:30:54,315 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11251 GetRequests, 11188 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 13:30:54,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 13:30:54,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 13:30:54,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 13:30:54,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 13:30:54,342 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 5620 [2020-07-20 13:30:54,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:30:54,345 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 13:30:54,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 13:30:54,345 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 13:30:55,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14873 [2020-07-20 13:30:55,389 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:30:55,393 INFO L422 BasicCegarLoop]: trace histogram [2287, 2287, 1144, 1143, 1143, 1143, 1143, 1143, 1143, 1143, 1143, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:30:55,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:30:55,594 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:30:55,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:30:55,599 INFO L82 PathProgramCache]: Analyzing trace with hash 187865292, now seen corresponding path program 12 times [2020-07-20 13:30:55,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:30:55,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [417530100] [2020-07-20 13:30:55,600 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:31:00,339 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:31:00,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:31:00,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 26984 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 13:31:00,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:32:17,184 INFO L134 CoverageAnalysis]: Checked inductivity of 13719429 backedges. 15142 proven. 141758 refuted. 0 times theorem prover too weak. 13562529 trivial. 0 not checked. [2020-07-20 13:32:17,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:32:21,884 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:32:21,990 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:32:24,660 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:32:24,775 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:32:24,900 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:32:25,013 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:32:27,533 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:32:27,647 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:32:27,777 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:32:27,917 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:32:32,828 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:32:32,973 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:32:33,127 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:32:33,280 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:32:46,580 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:32:46,741 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:32:46,910 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:32:47,079 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:32:47,249 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 13:32:47,407 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 13:32:47,556 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 13:32:47,700 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 13:32:47,835 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:32:47,961 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 13:32:48,083 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:32:48,200 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:32:48,306 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:32:48,409 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:33:15,673 WARN L193 SmtUtils]: Spent 1.31 s on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:33:47,587 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:34:18,600 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:34:24,769 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:34:25,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts