/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_VARIABLES --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_25-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:42:41,082 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:42:41,086 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:42:41,107 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:42:41,108 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:42:41,110 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:42:41,112 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:42:41,126 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:42:41,127 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:42:41,128 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:42:41,129 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:42:41,130 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:42:41,131 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:42:41,132 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:42:41,135 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:42:41,136 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:42:41,138 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:42:41,139 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:42:41,143 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:42:41,147 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:42:41,149 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:42:41,150 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:42:41,152 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:42:41,152 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:42:41,158 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:42:41,175 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:42:41,176 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:42:41,178 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:42:41,179 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 16:42:41,205 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:42:41,206 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:42:41,208 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:42:41,209 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:42:41,209 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:42:41,209 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:42:41,209 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:42:41,210 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:42:41,210 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:42:41,210 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:42:41,211 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:42:41,212 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:42:41,212 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:42:41,212 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:42:41,212 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:42:41,213 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:42:41,213 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:42:41,213 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:42:41,213 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:42:41,214 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:42:41,214 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:42:41,214 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:42:41,214 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:42:41,214 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:42:41,215 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:42:41,215 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:42:41,215 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:41,215 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:42:41,216 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:42:41,216 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_VARIABLES 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 16:42:41,576 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:42:41,591 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:42:41,596 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:42:41,597 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:42:41,598 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:42:41,599 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-20 16:42:41,672 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f0a4f2cd/4e4a62e7503e4366b5dc3ce24bee9a85/FLAGd35478a6a [2020-07-20 16:42:42,206 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:42:42,209 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-20 16:42:42,219 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f0a4f2cd/4e4a62e7503e4366b5dc3ce24bee9a85/FLAGd35478a6a [2020-07-20 16:42:42,587 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f0a4f2cd/4e4a62e7503e4366b5dc3ce24bee9a85 [2020-07-20 16:42:42,597 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:42:42,600 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:42:42,602 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:42:42,602 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:42:42,606 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:42:42,608 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,611 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2cee54b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42, skipping insertion in model container [2020-07-20 16:42:42,611 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,621 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:42:42,643 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:42:42,825 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:42:42,830 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:42:42,848 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:42:42,864 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:42:42,864 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42 WrapperNode [2020-07-20 16:42:42,865 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:42:42,866 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:42:42,866 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:42:42,866 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:42:42,878 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,879 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,884 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,884 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,888 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,890 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,891 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,892 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:42:42,893 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:42:42,893 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:42:42,893 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:42:42,895 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (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 16:42:43,070 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:42:43,071 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:42:43,071 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 16:42:43,071 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:42:43,071 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:42:43,071 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:42:43,071 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 16:42:43,072 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:42:43,072 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:42:43,072 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:42:43,273 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:42:43,273 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:42:43,279 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:42:43 BoogieIcfgContainer [2020-07-20 16:42:43,279 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:42:43,281 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:42:43,281 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:42:43,286 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:42:43,287 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:42:42" (1/3) ... [2020-07-20 16:42:43,288 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f225c03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:42:43, skipping insertion in model container [2020-07-20 16:42:43,289 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (2/3) ... [2020-07-20 16:42:43,289 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f225c03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:42:43, skipping insertion in model container [2020-07-20 16:42:43,289 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:42:43" (3/3) ... [2020-07-20 16:42:43,292 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-1.c [2020-07-20 16:42:43,308 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:42:43,318 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:42:43,363 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:42:43,433 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:42:43,433 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:42:43,433 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:42:43,433 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:42:43,436 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:42:43,437 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:42:43,437 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:42:43,437 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:42:43,460 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 16:42:43,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:42:43,471 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:43,472 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:42:43,473 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:43,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:43,480 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 16:42:43,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:43,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [745698752] [2020-07-20 16:42:43,490 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 16:42:43,560 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:43,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:43,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:42:43,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:43,663 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 16:42:43,663 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:42:43,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [745698752] [2020-07-20 16:42:43,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:42:43,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:42:43,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117487897] [2020-07-20 16:42:43,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:42:43,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:43,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:42:43,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:42:43,687 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 16:42:43,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:43,797 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 16:42:43,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:42:43,799 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:42:43,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:43,811 INFO L225 Difference]: With dead ends: 35 [2020-07-20 16:42:43,812 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 16:42:43,816 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 16:42:43,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 16:42:43,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 16:42:43,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:42:43,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 16:42:43,872 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 16:42:43,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:43,872 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 16:42:43,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:42:43,873 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 16:42:43,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:42:43,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:43,875 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:42:44,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:44,092 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:44,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:44,093 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 16:42:44,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:44,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1456855632] [2020-07-20 16:42:44,095 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 16:42:44,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:44,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:44,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:42:44,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:44,174 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 16:42:44,175 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:42:44,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1456855632] [2020-07-20 16:42:44,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:42:44,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:42:44,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629870123] [2020-07-20 16:42:44,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:42:44,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:44,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:42:44,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:42:44,184 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 16:42:44,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:44,253 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 16:42:44,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:42:44,255 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:42:44,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:44,256 INFO L225 Difference]: With dead ends: 27 [2020-07-20 16:42:44,257 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 16:42:44,258 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 16:42:44,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 16:42:44,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 16:42:44,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:42:44,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 16:42:44,268 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 16:42:44,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:44,268 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 16:42:44,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:42:44,269 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 16:42:44,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:42:44,271 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:44,271 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 16:42:44,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:44,479 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:44,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:44,481 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 16:42:44,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:44,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1235034492] [2020-07-20 16:42:44,483 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 16:42:44,521 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:44,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:44,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:42:44,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:44,600 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 16:42:44,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:44,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:44,897 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 16:42:44,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1235034492] [2020-07-20 16:42:44,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:44,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 16:42:44,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280789606] [2020-07-20 16:42:44,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:42:44,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:44,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:42:44,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:42:44,901 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 16:42:45,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:45,027 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 16:42:45,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:42:45,028 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 16:42:45,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:45,030 INFO L225 Difference]: With dead ends: 32 [2020-07-20 16:42:45,031 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 16:42:45,032 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 16:42:45,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 16:42:45,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 16:42:45,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 16:42:45,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 16:42:45,043 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 16:42:45,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:45,043 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 16:42:45,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:42:45,044 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 16:42:45,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:42:45,046 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:45,046 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 16:42:45,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:45,261 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:45,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:45,262 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 16:42:45,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:45,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1216679197] [2020-07-20 16:42:45,263 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 16:42:45,295 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:45,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:45,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:42:45,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:45,351 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 16:42:45,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:45,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:45,545 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 16:42:45,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1216679197] [2020-07-20 16:42:45,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:45,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 16:42:45,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273059707] [2020-07-20 16:42:45,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:42:45,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:45,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:42:45,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:42:45,549 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 16:42:45,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:45,692 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 16:42:45,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:42:45,693 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 16:42:45,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:45,697 INFO L225 Difference]: With dead ends: 37 [2020-07-20 16:42:45,697 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 16:42:45,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 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 16:42:45,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 16:42:45,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 16:42:45,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 16:42:45,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 16:42:45,719 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 16:42:45,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:45,721 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 16:42:45,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:42:45,722 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 16:42:45,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:42:45,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:45,726 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 16:42:45,926 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:45,927 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:45,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:45,928 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 16:42:45,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:45,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1294342785] [2020-07-20 16:42:45,929 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 16:42:45,966 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:45,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:45,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:42:45,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:46,020 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 16:42:46,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:46,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:46,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:46,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:46,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:46,399 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 16:42:46,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1294342785] [2020-07-20 16:42:46,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:46,400 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 16:42:46,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995277186] [2020-07-20 16:42:46,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:42:46,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:46,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:42:46,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:42:46,405 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 16:42:46,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:46,605 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 16:42:46,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:42:46,608 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 16:42:46,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:46,610 INFO L225 Difference]: With dead ends: 42 [2020-07-20 16:42:46,610 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 16:42:46,611 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 16:42:46,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 16:42:46,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 16:42:46,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 16:42:46,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 16:42:46,627 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 16:42:46,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:46,628 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 16:42:46,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:42:46,628 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 16:42:46,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:42:46,630 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:46,630 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 16:42:46,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:46,833 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:46,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:46,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 16:42:46,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:46,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1056399957] [2020-07-20 16:42:46,836 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 16:42:46,875 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:46,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:46,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:42:46,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:46,925 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 16:42:46,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:47,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:47,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:47,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:47,266 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 16:42:47,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1056399957] [2020-07-20 16:42:47,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:47,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 16:42:47,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48921830] [2020-07-20 16:42:47,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:42:47,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:47,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:42:47,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:42:47,269 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 16:42:47,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:47,410 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 16:42:47,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:42:47,410 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 16:42:47,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:47,413 INFO L225 Difference]: With dead ends: 47 [2020-07-20 16:42:47,413 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 16:42:47,414 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 16:42:47,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 16:42:47,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 16:42:47,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 16:42:47,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 16:42:47,430 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 16:42:47,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:47,431 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 16:42:47,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:42:47,431 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 16:42:47,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 16:42:47,434 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:47,434 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 16:42:47,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:47,649 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:47,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:47,649 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 16:42:47,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:47,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467645536] [2020-07-20 16:42:47,651 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 16:42:47,700 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:47,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:47,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:42:47,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:47,760 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 16:42:47,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:48,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:48,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:48,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:48,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:48,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:48,430 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 16:42:48,431 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467645536] [2020-07-20 16:42:48,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:48,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 16:42:48,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295377276] [2020-07-20 16:42:48,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:42:48,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:48,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:42:48,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:42:48,434 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 16:42:48,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:48,600 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 16:42:48,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:42:48,601 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 16:42:48,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:48,604 INFO L225 Difference]: With dead ends: 52 [2020-07-20 16:42:48,604 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 16:42:48,605 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 16:42:48,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 16:42:48,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 16:42:48,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 16:42:48,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 16:42:48,619 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 16:42:48,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:48,620 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 16:42:48,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:42:48,620 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 16:42:48,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 16:42:48,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:48,624 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 16:42:48,838 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:48,839 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:48,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:48,840 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 16:42:48,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:48,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [118432044] [2020-07-20 16:42:48,841 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 16:42:48,892 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:42:48,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:48,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:42:48,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:49,046 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 115 proven. 171 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2020-07-20 16:42:49,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:49,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:49,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:49,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:50,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:50,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:50,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:50,301 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 115 proven. 193 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2020-07-20 16:42:50,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [118432044] [2020-07-20 16:42:50,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:50,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 21 [2020-07-20 16:42:50,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949294230] [2020-07-20 16:42:50,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:42:50,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:50,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:42:50,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:42:50,309 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 21 states. [2020-07-20 16:42:50,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:50,893 INFO L93 Difference]: Finished difference Result 94 states and 184 transitions. [2020-07-20 16:42:50,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:42:50,894 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 96 [2020-07-20 16:42:50,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:50,896 INFO L225 Difference]: With dead ends: 94 [2020-07-20 16:42:50,896 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:42:50,899 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 164 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=981, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:42:50,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:42:50,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:42:50,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:42:50,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 77 transitions. [2020-07-20 16:42:50,911 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 77 transitions. Word has length 96 [2020-07-20 16:42:50,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:50,912 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 77 transitions. [2020-07-20 16:42:50,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:42:50,912 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 77 transitions. [2020-07-20 16:42:50,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:42:50,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:50,914 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:42:51,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:51,129 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:51,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:51,130 INFO L82 PathProgramCache]: Analyzing trace with hash 2001184551, now seen corresponding path program 4 times [2020-07-20 16:42:51,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:51,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [788509550] [2020-07-20 16:42:51,131 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 16:42:51,199 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:51,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:51,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:42:51,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:51,249 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 88 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 16:42:51,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:51,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:51,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:51,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:51,787 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 103 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-07-20 16:42:51,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [788509550] [2020-07-20 16:42:51,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:51,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 16:42:51,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577584233] [2020-07-20 16:42:51,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:42:51,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:51,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:42:51,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:42:51,790 INFO L87 Difference]: Start difference. First operand 61 states and 77 transitions. Second operand 13 states. [2020-07-20 16:42:51,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:51,919 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-07-20 16:42:51,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:42:51,920 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 68 [2020-07-20 16:42:51,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:51,922 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:42:51,922 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:42:51,923 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 116 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 16:42:51,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:42:51,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-07-20 16:42:51,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:42:51,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2020-07-20 16:42:51,932 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 68 [2020-07-20 16:42:51,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:51,932 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2020-07-20 16:42:51,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:42:51,933 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2020-07-20 16:42:51,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 16:42:51,935 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:51,935 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:42:52,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:52,143 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:52,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:52,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 5 times [2020-07-20 16:42:52,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:52,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346628651] [2020-07-20 16:42:52,145 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 16:42:52,217 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:52,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:52,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:42:52,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:52,306 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 42 proven. 229 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2020-07-20 16:42:52,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:52,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:53,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:53,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:53,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:53,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:53,229 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 42 proven. 255 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2020-07-20 16:42:53,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346628651] [2020-07-20 16:42:53,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:53,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 16:42:53,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34989327] [2020-07-20 16:42:53,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:42:53,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:53,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:42:53,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:42:53,233 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand 15 states. [2020-07-20 16:42:53,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:53,409 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-07-20 16:42:53,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:42:53,409 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 109 [2020-07-20 16:42:53,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:53,411 INFO L225 Difference]: With dead ends: 68 [2020-07-20 16:42:53,411 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:42:53,412 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 194 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 16:42:53,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:42:53,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-07-20 16:42:53,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 16:42:53,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 80 transitions. [2020-07-20 16:42:53,422 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 80 transitions. Word has length 109 [2020-07-20 16:42:53,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:53,423 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 80 transitions. [2020-07-20 16:42:53,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:42:53,423 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 80 transitions. [2020-07-20 16:42:53,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-20 16:42:53,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:53,428 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 25, 15, 15, 15, 15, 15, 15, 15, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:42:53,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:53,643 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:53,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:53,644 INFO L82 PathProgramCache]: Analyzing trace with hash 706081956, now seen corresponding path program 6 times [2020-07-20 16:42:53,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:53,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949126943] [2020-07-20 16:42:53,645 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 16:42:53,740 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:42:53,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:53,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:42:53,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:53,914 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 839 refuted. 0 times theorem prover too weak. 1278 trivial. 0 not checked. [2020-07-20 16:42:53,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:55,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:55,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:55,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:55,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:55,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:56,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:56,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:56,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:56,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:56,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:56,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:56,440 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 891 refuted. 0 times theorem prover too weak. 1226 trivial. 0 not checked. [2020-07-20 16:42:56,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [949126943] [2020-07-20 16:42:56,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:56,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 16:42:56,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301341266] [2020-07-20 16:42:56,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:42:56,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:56,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:42:56,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:42:56,443 INFO L87 Difference]: Start difference. First operand 64 states and 80 transitions. Second operand 25 states. [2020-07-20 16:42:57,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:57,246 INFO L93 Difference]: Finished difference Result 144 states and 221 transitions. [2020-07-20 16:42:57,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 16:42:57,247 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 218 [2020-07-20 16:42:57,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:57,251 INFO L225 Difference]: With dead ends: 144 [2020-07-20 16:42:57,251 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 16:42:57,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 391 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=539, Invalid=1531, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:42:57,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 16:42:57,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 78. [2020-07-20 16:42:57,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-20 16:42:57,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 102 transitions. [2020-07-20 16:42:57,266 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 102 transitions. Word has length 218 [2020-07-20 16:42:57,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:57,267 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 102 transitions. [2020-07-20 16:42:57,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:42:57,267 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 102 transitions. [2020-07-20 16:42:57,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-20 16:42:57,270 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:57,270 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:42:57,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:57,484 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:57,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:57,485 INFO L82 PathProgramCache]: Analyzing trace with hash 259499213, now seen corresponding path program 7 times [2020-07-20 16:42:57,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:57,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1900819332] [2020-07-20 16:42:57,486 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 16:42:57,602 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:57,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:57,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:42:57,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:57,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 93 proven. 533 refuted. 0 times theorem prover too weak. 1028 trivial. 0 not checked. [2020-07-20 16:42:57,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:58,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:58,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:58,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:59,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:59,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:59,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:59,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:59,280 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 93 proven. 573 refuted. 0 times theorem prover too weak. 988 trivial. 0 not checked. [2020-07-20 16:42:59,281 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1900819332] [2020-07-20 16:42:59,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:59,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 16:42:59,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146052129] [2020-07-20 16:42:59,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:42:59,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:59,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:42:59,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:42:59,283 INFO L87 Difference]: Start difference. First operand 78 states and 102 transitions. Second operand 17 states. [2020-07-20 16:42:59,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:59,511 INFO L93 Difference]: Finished difference Result 85 states and 111 transitions. [2020-07-20 16:42:59,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:42:59,512 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 177 [2020-07-20 16:42:59,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:59,515 INFO L225 Difference]: With dead ends: 85 [2020-07-20 16:42:59,515 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 16:42:59,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 326 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 16:42:59,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 16:42:59,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2020-07-20 16:42:59,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-20 16:42:59,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 107 transitions. [2020-07-20 16:42:59,529 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 107 transitions. Word has length 177 [2020-07-20 16:42:59,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:59,530 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 107 transitions. [2020-07-20 16:42:59,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:42:59,530 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 107 transitions. [2020-07-20 16:42:59,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 16:42:59,535 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:59,535 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 33, 20, 20, 20, 20, 20, 20, 20, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:42:59,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:59,750 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:59,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:59,751 INFO L82 PathProgramCache]: Analyzing trace with hash -1425621089, now seen corresponding path program 8 times [2020-07-20 16:42:59,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:59,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278765300] [2020-07-20 16:42:59,752 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 16:42:59,935 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:59,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:59,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:42:59,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:43:00,099 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 189 proven. 1130 refuted. 0 times theorem prover too weak. 3249 trivial. 0 not checked. [2020-07-20 16:43:00,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:43:01,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:01,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:02,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:02,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:02,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:02,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:02,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:02,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:02,797 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 189 proven. 1187 refuted. 0 times theorem prover too weak. 3192 trivial. 0 not checked. [2020-07-20 16:43:02,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278765300] [2020-07-20 16:43:02,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:43:02,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 16:43:02,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180233475] [2020-07-20 16:43:02,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:43:02,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:43:02,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:43:02,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:43:02,800 INFO L87 Difference]: Start difference. First operand 81 states and 107 transitions. Second operand 19 states. [2020-07-20 16:43:03,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:43:03,087 INFO L93 Difference]: Finished difference Result 90 states and 124 transitions. [2020-07-20 16:43:03,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:43:03,087 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 286 [2020-07-20 16:43:03,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:43:03,090 INFO L225 Difference]: With dead ends: 90 [2020-07-20 16:43:03,090 INFO L226 Difference]: Without dead ends: 86 [2020-07-20 16:43:03,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 540 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 16:43:03,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-20 16:43:03,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2020-07-20 16:43:03,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-20 16:43:03,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 120 transitions. [2020-07-20 16:43:03,115 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 120 transitions. Word has length 286 [2020-07-20 16:43:03,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:43:03,117 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 120 transitions. [2020-07-20 16:43:03,117 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:43:03,117 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 120 transitions. [2020-07-20 16:43:03,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 16:43:03,131 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:43:03,132 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 59, 36, 36, 36, 36, 36, 36, 36, 23, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:43:03,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:43:03,346 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:43:03,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:43:03,347 INFO L82 PathProgramCache]: Analyzing trace with hash -350328107, now seen corresponding path program 9 times [2020-07-20 16:43:03,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:43:03,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1197567258] [2020-07-20 16:43:03,349 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 16:43:03,557 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:43:03,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:43:03,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 754 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:43:03,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:43:03,897 INFO L134 CoverageAnalysis]: Checked inductivity of 14743 backedges. 7742 proven. 1596 refuted. 0 times theorem prover too weak. 5405 trivial. 0 not checked. [2020-07-20 16:43:03,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:43:06,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:07,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:07,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:07,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:07,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:07,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:07,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:07,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:08,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:08,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:08,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:08,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:09,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:09,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:09,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:09,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:09,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:09,371 INFO L134 CoverageAnalysis]: Checked inductivity of 14743 backedges. 1220 proven. 3406 refuted. 0 times theorem prover too weak. 10117 trivial. 0 not checked. [2020-07-20 16:43:09,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1197567258] [2020-07-20 16:43:09,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:43:09,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 27] total 29 [2020-07-20 16:43:09,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073794732] [2020-07-20 16:43:09,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:43:09,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:43:09,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:43:09,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:43:09,375 INFO L87 Difference]: Start difference. First operand 86 states and 120 transitions. Second operand 29 states. [2020-07-20 16:43:10,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:43:10,677 INFO L93 Difference]: Finished difference Result 187 states and 314 transitions. [2020-07-20 16:43:10,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-20 16:43:10,680 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 504 [2020-07-20 16:43:10,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:43:10,707 INFO L225 Difference]: With dead ends: 187 [2020-07-20 16:43:10,707 INFO L226 Difference]: Without dead ends: 109 [2020-07-20 16:43:10,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1033 GetRequests, 955 SyntacticMatches, 25 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=747, Invalid=2223, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 16:43:10,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-07-20 16:43:10,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 98. [2020-07-20 16:43:10,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 16:43:10,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 135 transitions. [2020-07-20 16:43:10,726 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 135 transitions. Word has length 504 [2020-07-20 16:43:10,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:43:10,727 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 135 transitions. [2020-07-20 16:43:10,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:43:10,727 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 135 transitions. [2020-07-20 16:43:10,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-20 16:43:10,731 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:43:10,732 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 54, 33, 33, 33, 33, 33, 33, 33, 21, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:43:10,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:43:10,948 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:43:10,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:43:10,948 INFO L82 PathProgramCache]: Analyzing trace with hash -229001048, now seen corresponding path program 10 times [2020-07-20 16:43:10,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:43:10,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1629276068] [2020-07-20 16:43:10,949 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 16:43:11,224 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:43:11,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:43:11,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 894 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:43:11,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:43:11,460 INFO L134 CoverageAnalysis]: Checked inductivity of 12387 backedges. 361 proven. 2270 refuted. 0 times theorem prover too weak. 9756 trivial. 0 not checked. [2020-07-20 16:43:11,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:43:13,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:13,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:14,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:14,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:15,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:15,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:15,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:15,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:15,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:15,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:15,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:15,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:15,749 INFO L134 CoverageAnalysis]: Checked inductivity of 12387 backedges. 361 proven. 2347 refuted. 0 times theorem prover too weak. 9679 trivial. 0 not checked. [2020-07-20 16:43:15,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1629276068] [2020-07-20 16:43:15,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:43:15,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 16:43:15,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141262391] [2020-07-20 16:43:15,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:43:15,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:43:15,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:43:15,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:43:15,753 INFO L87 Difference]: Start difference. First operand 98 states and 135 transitions. Second operand 21 states. [2020-07-20 16:43:16,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:43:16,096 INFO L93 Difference]: Finished difference Result 107 states and 153 transitions. [2020-07-20 16:43:16,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:43:16,096 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 463 [2020-07-20 16:43:16,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:43:16,100 INFO L225 Difference]: With dead ends: 107 [2020-07-20 16:43:16,101 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 16:43:16,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 933 GetRequests, 890 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 16:43:16,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 16:43:16,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-07-20 16:43:16,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-07-20 16:43:16,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 149 transitions. [2020-07-20 16:43:16,112 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 149 transitions. Word has length 463 [2020-07-20 16:43:16,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:43:16,113 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 149 transitions. [2020-07-20 16:43:16,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:43:16,113 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 149 transitions. [2020-07-20 16:43:16,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 995 [2020-07-20 16:43:16,124 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:43:16,125 INFO L422 BasicCegarLoop]: trace histogram [145, 145, 117, 72, 72, 72, 72, 72, 72, 72, 45, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:43:16,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:43:16,326 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:43:16,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:43:16,328 INFO L82 PathProgramCache]: Analyzing trace with hash -928557949, now seen corresponding path program 11 times [2020-07-20 16:43:16,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:43:16,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1752608583] [2020-07-20 16:43:16,329 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 16:43:16,641 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:43:16,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:43:16,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 791 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:43:16,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:43:17,352 INFO L134 CoverageAnalysis]: Checked inductivity of 58770 backedges. 29376 proven. 4650 refuted. 0 times theorem prover too weak. 24744 trivial. 0 not checked. [2020-07-20 16:43:17,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:43:23,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:23,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:24,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:24,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:24,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:25,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:25,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:25,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:25,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:27,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:27,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:27,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:27,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:27,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:27,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:28,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:28,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:28,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:28,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:28,784 INFO L134 CoverageAnalysis]: Checked inductivity of 58770 backedges. 2815 proven. 9221 refuted. 0 times theorem prover too weak. 46734 trivial. 0 not checked. [2020-07-20 16:43:28,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1752608583] [2020-07-20 16:43:28,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:43:28,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 33] total 37 [2020-07-20 16:43:28,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815333657] [2020-07-20 16:43:28,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 16:43:28,788 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:43:28,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 16:43:28,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1124, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:43:28,789 INFO L87 Difference]: Start difference. First operand 103 states and 149 transitions. Second operand 37 states. [2020-07-20 16:43:30,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:43:30,906 INFO L93 Difference]: Finished difference Result 257 states and 498 transitions. [2020-07-20 16:43:30,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-20 16:43:30,907 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 994 [2020-07-20 16:43:30,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:43:30,911 INFO L225 Difference]: With dead ends: 257 [2020-07-20 16:43:30,911 INFO L226 Difference]: Without dead ends: 162 [2020-07-20 16:43:30,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2023 GetRequests, 1923 SyntacticMatches, 29 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1231, Invalid=4025, Unknown=0, NotChecked=0, Total=5256 [2020-07-20 16:43:30,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-20 16:43:30,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 129. [2020-07-20 16:43:30,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-07-20 16:43:30,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 186 transitions. [2020-07-20 16:43:30,928 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 186 transitions. Word has length 994 [2020-07-20 16:43:30,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:43:30,929 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 186 transitions. [2020-07-20 16:43:30,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 16:43:30,929 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 186 transitions. [2020-07-20 16:43:30,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 750 [2020-07-20 16:43:30,935 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:43:30,936 INFO L422 BasicCegarLoop]: trace histogram [109, 109, 88, 54, 54, 54, 54, 54, 54, 54, 34, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:43:31,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:43:31,137 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:43:31,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:43:31,139 INFO L82 PathProgramCache]: Analyzing trace with hash -127293739, now seen corresponding path program 12 times [2020-07-20 16:43:31,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:43:31,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [803690129] [2020-07-20 16:43:31,139 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 16:43:31,588 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:43:31,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:43:31,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 1446 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:43:31,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:43:32,040 INFO L134 CoverageAnalysis]: Checked inductivity of 33096 backedges. 659 proven. 4380 refuted. 0 times theorem prover too weak. 28057 trivial. 0 not checked. [2020-07-20 16:43:32,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:43:35,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:36,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:37,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:38,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:38,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:38,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:38,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:38,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:38,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:38,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:38,927 INFO L134 CoverageAnalysis]: Checked inductivity of 33096 backedges. 659 proven. 4480 refuted. 0 times theorem prover too weak. 27957 trivial. 0 not checked. [2020-07-20 16:43:38,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [803690129] [2020-07-20 16:43:38,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:43:38,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 16:43:38,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103134444] [2020-07-20 16:43:38,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:43:38,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:43:38,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:43:38,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:43:38,932 INFO L87 Difference]: Start difference. First operand 129 states and 186 transitions. Second operand 23 states. [2020-07-20 16:43:39,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:43:39,233 INFO L93 Difference]: Finished difference Result 136 states and 198 transitions. [2020-07-20 16:43:39,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:43:39,234 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 749 [2020-07-20 16:43:39,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:43:39,238 INFO L225 Difference]: With dead ends: 136 [2020-07-20 16:43:39,238 INFO L226 Difference]: Without dead ends: 132 [2020-07-20 16:43:39,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1506 GetRequests, 1458 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 16:43:39,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-07-20 16:43:39,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2020-07-20 16:43:39,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-07-20 16:43:39,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 194 transitions. [2020-07-20 16:43:39,251 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 194 transitions. Word has length 749 [2020-07-20 16:43:39,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:43:39,252 INFO L479 AbstractCegarLoop]: Abstraction has 132 states and 194 transitions. [2020-07-20 16:43:39,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:43:39,253 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 194 transitions. [2020-07-20 16:43:39,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2098 [2020-07-20 16:43:39,298 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:43:39,299 INFO L422 BasicCegarLoop]: trace histogram [307, 307, 248, 153, 153, 153, 153, 153, 153, 153, 95, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:43:39,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:43:39,515 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:43:39,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:43:39,516 INFO L82 PathProgramCache]: Analyzing trace with hash -1575583038, now seen corresponding path program 13 times [2020-07-20 16:43:39,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:43:39,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [72139550] [2020-07-20 16:43:39,517 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 16:43:40,298 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:43:40,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:43:40,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 3131 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-20 16:43:40,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:43:42,743 INFO L134 CoverageAnalysis]: Checked inductivity of 265024 backedges. 11579 proven. 25169 refuted. 0 times theorem prover too weak. 228276 trivial. 0 not checked. [2020-07-20 16:43:42,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:43:54,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:57,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:59,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:59,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:02,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:03,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:05,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:06,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:06,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:11,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:11,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:13,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:13,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:14,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:14,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:14,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:14,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:14,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:15,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:15,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:15,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:15,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:17,353 INFO L134 CoverageAnalysis]: Checked inductivity of 265024 backedges. 11579 proven. 25491 refuted. 0 times theorem prover too weak. 227954 trivial. 0 not checked. [2020-07-20 16:44:17,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [72139550] [2020-07-20 16:44:17,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:44:17,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 47] total 51 [2020-07-20 16:44:17,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183101735] [2020-07-20 16:44:17,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-20 16:44:17,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:44:17,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-20 16:44:17,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=2165, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 16:44:17,359 INFO L87 Difference]: Start difference. First operand 132 states and 194 transitions. Second operand 51 states. [2020-07-20 16:44:23,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:44:23,368 INFO L93 Difference]: Finished difference Result 415 states and 1048 transitions. [2020-07-20 16:44:23,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-20 16:44:23,369 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 2097 [2020-07-20 16:44:23,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:44:23,377 INFO L225 Difference]: With dead ends: 415 [2020-07-20 16:44:23,377 INFO L226 Difference]: Without dead ends: 289 [2020-07-20 16:44:23,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4251 GetRequests, 4101 SyntacticMatches, 43 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3181 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2775, Invalid=8997, Unknown=0, NotChecked=0, Total=11772 [2020-07-20 16:44:23,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-20 16:44:23,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 218. [2020-07-20 16:44:23,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-07-20 16:44:23,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 372 transitions. [2020-07-20 16:44:23,419 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 372 transitions. Word has length 2097 [2020-07-20 16:44:23,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:44:23,421 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 372 transitions. [2020-07-20 16:44:23,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-20 16:44:23,421 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 372 transitions. [2020-07-20 16:44:23,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1213 [2020-07-20 16:44:23,437 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:44:23,438 INFO L422 BasicCegarLoop]: trace histogram [177, 177, 143, 88, 88, 88, 88, 88, 88, 88, 55, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:44:23,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:44:23,654 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:44:23,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:44:23,656 INFO L82 PathProgramCache]: Analyzing trace with hash 452920407, now seen corresponding path program 14 times [2020-07-20 16:44:23,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:44:23,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1941810253] [2020-07-20 16:44:23,657 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 16:44:24,456 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:44:24,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:44:24,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 2335 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:44:24,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:44:25,278 INFO L134 CoverageAnalysis]: Checked inductivity of 87769 backedges. 1164 proven. 8218 refuted. 0 times theorem prover too weak. 78387 trivial. 0 not checked. [2020-07-20 16:44:25,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:44:31,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:33,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:33,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:34,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:34,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:35,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:35,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:36,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:36,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:36,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:36,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:36,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:37,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:37,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:37,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:37,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:37,877 INFO L134 CoverageAnalysis]: Checked inductivity of 87769 backedges. 1164 proven. 8344 refuted. 0 times theorem prover too weak. 78261 trivial. 0 not checked. [2020-07-20 16:44:37,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1941810253] [2020-07-20 16:44:37,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:44:37,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 16:44:37,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838616790] [2020-07-20 16:44:37,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:44:37,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:44:37,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:44:37,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:44:37,881 INFO L87 Difference]: Start difference. First operand 218 states and 372 transitions. Second operand 25 states. [2020-07-20 16:44:38,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:44:38,327 INFO L93 Difference]: Finished difference Result 222 states and 375 transitions. [2020-07-20 16:44:38,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 16:44:38,329 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1212 [2020-07-20 16:44:38,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:44:38,335 INFO L225 Difference]: With dead ends: 222 [2020-07-20 16:44:38,335 INFO L226 Difference]: Without dead ends: 218 [2020-07-20 16:44:38,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2433 GetRequests, 2380 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 16:44:38,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-20 16:44:38,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 218. [2020-07-20 16:44:38,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-07-20 16:44:38,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 371 transitions. [2020-07-20 16:44:38,358 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 371 transitions. Word has length 1212 [2020-07-20 16:44:38,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:44:38,359 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 371 transitions. [2020-07-20 16:44:38,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:44:38,359 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 371 transitions. [2020-07-20 16:44:38,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1962 [2020-07-20 16:44:38,397 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:44:38,398 INFO L422 BasicCegarLoop]: trace histogram [287, 287, 232, 143, 143, 143, 143, 143, 143, 143, 89, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:44:38,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:44:38,613 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:44:38,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:44:38,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1868832152, now seen corresponding path program 15 times [2020-07-20 16:44:38,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:44:38,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1790449688] [2020-07-20 16:44:38,616 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 16:44:39,647 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:44:39,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:44:39,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 3779 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:44:39,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:44:41,606 INFO L134 CoverageAnalysis]: Checked inductivity of 231572 backedges. 2007 proven. 15097 refuted. 0 times theorem prover too weak. 214468 trivial. 0 not checked. [2020-07-20 16:44:41,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:44:43,672 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:44:50,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:54,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:57,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:58,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:59,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:59,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:00,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:00,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:00,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:00,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:00,717 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 16:45:00,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:00,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:00,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:01,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:01,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:02,776 INFO L134 CoverageAnalysis]: Checked inductivity of 231572 backedges. 2007 proven. 15252 refuted. 0 times theorem prover too weak. 214313 trivial. 0 not checked. [2020-07-20 16:45:02,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1790449688] [2020-07-20 16:45:02,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:45:02,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 16:45:02,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494876901] [2020-07-20 16:45:02,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 16:45:02,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:45:02,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 16:45:02,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:45:02,781 INFO L87 Difference]: Start difference. First operand 218 states and 371 transitions. Second operand 27 states. [2020-07-20 16:45:03,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:03,367 INFO L93 Difference]: Finished difference Result 225 states and 390 transitions. [2020-07-20 16:45:03,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:45:03,372 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 1961 [2020-07-20 16:45:03,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:03,379 INFO L225 Difference]: With dead ends: 225 [2020-07-20 16:45:03,379 INFO L226 Difference]: Without dead ends: 221 [2020-07-20 16:45:03,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3932 GetRequests, 3874 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 16:45:03,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2020-07-20 16:45:03,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 221. [2020-07-20 16:45:03,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 221 states. [2020-07-20 16:45:03,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 384 transitions. [2020-07-20 16:45:03,405 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 384 transitions. Word has length 1961 [2020-07-20 16:45:03,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:03,406 INFO L479 AbstractCegarLoop]: Abstraction has 221 states and 384 transitions. [2020-07-20 16:45:03,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 16:45:03,406 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 384 transitions. [2020-07-20 16:45:03,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4386 [2020-07-20 16:45:03,559 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:03,561 INFO L422 BasicCegarLoop]: trace histogram [643, 643, 520, 321, 321, 321, 321, 321, 321, 321, 199, 123, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:45:03,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:03,763 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:03,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:03,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1809736744, now seen corresponding path program 16 times [2020-07-20 16:45:03,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:03,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517165572] [2020-07-20 16:45:03,766 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 16:45:05,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:45:05,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:05,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 6540 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-20 16:45:05,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:12,891 INFO L134 CoverageAnalysis]: Checked inductivity of 1165992 backedges. 23222 proven. 56314 refuted. 0 times theorem prover too weak. 1086456 trivial. 0 not checked. [2020-07-20 16:45:12,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:45:22,296 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 16:45:31,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:35,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:35,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:37,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:37,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:39,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:40,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:40,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:41,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:41,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:41,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:41,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:42,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:42,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:42,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:43,872 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:45:52,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:55,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:58,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:58,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:00,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:00,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:01,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:01,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:01,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:02,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:02,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:02,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:02,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:02,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:02,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:08,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1165992 backedges. 23222 proven. 56624 refuted. 0 times theorem prover too weak. 1086146 trivial. 0 not checked. [2020-07-20 16:46:08,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517165572] [2020-07-20 16:46:08,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:08,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 47] total 49 [2020-07-20 16:46:08,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000921612] [2020-07-20 16:46:08,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-07-20 16:46:08,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:08,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-07-20 16:46:08,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=1993, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 16:46:08,694 INFO L87 Difference]: Start difference. First operand 221 states and 384 transitions. Second operand 49 states. [2020-07-20 16:46:12,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:12,500 INFO L93 Difference]: Finished difference Result 482 states and 856 transitions. [2020-07-20 16:46:12,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-07-20 16:46:12,501 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 4385 [2020-07-20 16:46:12,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:12,508 INFO L225 Difference]: With dead ends: 482 [2020-07-20 16:46:12,508 INFO L226 Difference]: Without dead ends: 269 [2020-07-20 16:46:12,514 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8820 GetRequests, 8677 SyntacticMatches, 45 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2552 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2267, Invalid=7633, Unknown=0, NotChecked=0, Total=9900 [2020-07-20 16:46:12,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2020-07-20 16:46:12,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 205. [2020-07-20 16:46:12,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-07-20 16:46:12,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 326 transitions. [2020-07-20 16:46:12,530 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 326 transitions. Word has length 4385 [2020-07-20 16:46:12,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:12,532 INFO L479 AbstractCegarLoop]: Abstraction has 205 states and 326 transitions. [2020-07-20 16:46:12,532 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-07-20 16:46:12,532 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 326 transitions. [2020-07-20 16:46:12,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3174 [2020-07-20 16:46:12,590 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:12,591 INFO L422 BasicCegarLoop]: trace histogram [465, 465, 376, 232, 232, 232, 232, 232, 232, 232, 144, 89, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:12,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:12,792 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:12,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:12,794 INFO L82 PathProgramCache]: Analyzing trace with hash -740538915, now seen corresponding path program 17 times [2020-07-20 16:46:12,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:12,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [127174256] [2020-07-20 16:46:12,795 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 16:46:14,302 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:14,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:14,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 6112 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:46:14,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:17,687 INFO L134 CoverageAnalysis]: Checked inductivity of 609204 backedges. 3400 proven. 27297 refuted. 0 times theorem prover too weak. 578507 trivial. 0 not checked. [2020-07-20 16:46:17,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:21,711 WARN L193 SmtUtils]: Spent 565.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 16:46:34,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:34,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:40,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:45,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:45,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:47,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:47,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:49,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:50,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:51,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:51,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:51,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:51,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:51,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:51,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:52,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:52,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:55,089 INFO L134 CoverageAnalysis]: Checked inductivity of 609204 backedges. 3400 proven. 27484 refuted. 0 times theorem prover too weak. 578320 trivial. 0 not checked. [2020-07-20 16:46:55,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [127174256] [2020-07-20 16:46:55,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:55,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 16:46:55,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996340914] [2020-07-20 16:46:55,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:46:55,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:55,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:46:55,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:46:55,094 INFO L87 Difference]: Start difference. First operand 205 states and 326 transitions. Second operand 29 states. [2020-07-20 16:46:55,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:55,575 INFO L93 Difference]: Finished difference Result 209 states and 329 transitions. [2020-07-20 16:46:55,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 16:46:55,580 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 3173 [2020-07-20 16:46:55,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:55,584 INFO L225 Difference]: With dead ends: 209 [2020-07-20 16:46:55,584 INFO L226 Difference]: Without dead ends: 205 [2020-07-20 16:46:55,585 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6357 GetRequests, 6294 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 16:46:55,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-07-20 16:46:55,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2020-07-20 16:46:55,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-07-20 16:46:55,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 325 transitions. [2020-07-20 16:46:55,599 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 325 transitions. Word has length 3173 [2020-07-20 16:46:55,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:55,601 INFO L479 AbstractCegarLoop]: Abstraction has 205 states and 325 transitions. [2020-07-20 16:46:55,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:46:55,602 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 325 transitions. [2020-07-20 16:46:55,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5135 [2020-07-20 16:46:55,842 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:55,845 INFO L422 BasicCegarLoop]: trace histogram [753, 753, 609, 376, 376, 376, 376, 376, 376, 376, 233, 144, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:56,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:56,059 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:56,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:56,061 INFO L82 PathProgramCache]: Analyzing trace with hash -1603623985, now seen corresponding path program 18 times [2020-07-20 16:46:56,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:56,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233128847] [2020-07-20 16:46:56,061 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 16:46:58,119 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:58,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:58,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 9888 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 16:46:58,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:06,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1599648 backedges. 5686 proven. 48748 refuted. 0 times theorem prover too weak. 1545214 trivial. 0 not checked. [2020-07-20 16:47:06,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:33,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:33,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:45,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:45,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:57,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:57,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:00,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:03,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:03,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:04,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:05,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:05,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:05,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:05,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:05,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:06,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:06,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:06,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:14,331 INFO L134 CoverageAnalysis]: Checked inductivity of 1599648 backedges. 5686 proven. 48970 refuted. 0 times theorem prover too weak. 1544992 trivial. 0 not checked. [2020-07-20 16:48:14,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233128847] [2020-07-20 16:48:14,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:14,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-20 16:48:14,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267407379] [2020-07-20 16:48:14,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:48:14,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:14,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:48:14,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:48:14,336 INFO L87 Difference]: Start difference. First operand 205 states and 325 transitions. Second operand 31 states. [2020-07-20 16:48:15,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:15,038 INFO L93 Difference]: Finished difference Result 212 states and 342 transitions. [2020-07-20 16:48:15,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:48:15,041 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 5134 [2020-07-20 16:48:15,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:15,049 INFO L225 Difference]: With dead ends: 212 [2020-07-20 16:48:15,049 INFO L226 Difference]: Without dead ends: 208 [2020-07-20 16:48:15,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10280 GetRequests, 10212 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 16:48:15,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-20 16:48:15,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 208. [2020-07-20 16:48:15,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-20 16:48:15,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 338 transitions. [2020-07-20 16:48:15,063 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 338 transitions. Word has length 5134 [2020-07-20 16:48:15,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:15,066 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 338 transitions. [2020-07-20 16:48:15,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:48:15,066 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 338 transitions. [2020-07-20 16:48:15,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8308 [2020-07-20 16:48:15,832 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:15,836 INFO L422 BasicCegarLoop]: trace histogram [1219, 1219, 986, 609, 609, 609, 609, 609, 609, 609, 377, 233, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:16,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:16,051 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:16,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:16,052 INFO L82 PathProgramCache]: Analyzing trace with hash -497867032, now seen corresponding path program 19 times [2020-07-20 16:48:16,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:16,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1318128541] [2020-07-20 16:48:16,053 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 16:48:19,111 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:19,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:19,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 15998 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 16:48:19,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:40,088 INFO L134 CoverageAnalysis]: Checked inductivity of 4195633 backedges. 9420 proven. 86206 refuted. 0 times theorem prover too weak. 4100007 trivial. 0 not checked. [2020-07-20 16:48:40,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:48,272 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:48:48,383 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:48:48,498 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:48:48,610 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:48:52,394 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:48:52,516 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:48:52,649 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 16:48:52,775 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 16:48:52,897 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2020-07-20 16:48:53,005 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2020-07-20 16:48:53,110 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 16:49:29,595 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:49:31,238 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:49:31,345 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:49:31,459 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:49:31,578 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:49:33,984 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:49:34,102 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:49:34,224 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:49:34,352 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:49:34,472 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 16:49:34,587 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 16:49:34,699 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 16:49:35,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:35,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:01,075 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:50:01,183 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:50:01,290 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:50:01,406 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 16:50:01,512 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 16:50:01,628 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:50:01,741 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 16:50:02,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:18,603 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:50:18,713 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:50:18,826 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:50:18,933 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:50:19,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:19,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:31,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:38,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:42,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:42,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:45,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:45,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:47,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:47,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:48,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:48,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:49,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:49,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:49,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:49,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:11,940 INFO L134 CoverageAnalysis]: Checked inductivity of 4195633 backedges. 9420 proven. 86466 refuted. 0 times theorem prover too weak. 4099747 trivial. 0 not checked. [2020-07-20 16:51:11,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1318128541] [2020-07-20 16:51:11,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:11,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 31] total 33 [2020-07-20 16:51:11,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908487008] [2020-07-20 16:51:11,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 16:51:11,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:11,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 16:51:11,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:51:11,949 INFO L87 Difference]: Start difference. First operand 208 states and 338 transitions. Second operand 33 states. [2020-07-20 16:51:13,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:13,432 INFO L93 Difference]: Finished difference Result 217 states and 362 transitions. [2020-07-20 16:51:13,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:51:13,435 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 8307 [2020-07-20 16:51:13,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:13,446 INFO L225 Difference]: With dead ends: 217 [2020-07-20 16:51:13,447 INFO L226 Difference]: Without dead ends: 213 [2020-07-20 16:51:13,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16627 GetRequests, 16554 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 16:51:13,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2020-07-20 16:51:13,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 213. [2020-07-20 16:51:13,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2020-07-20 16:51:13,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 358 transitions. [2020-07-20 16:51:13,463 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 358 transitions. Word has length 8307 [2020-07-20 16:51:13,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:13,469 INFO L479 AbstractCegarLoop]: Abstraction has 213 states and 358 transitions. [2020-07-20 16:51:13,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 16:51:13,469 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 358 transitions. [2020-07-20 16:51:14,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13442 [2020-07-20 16:51:14,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:14,450 INFO L422 BasicCegarLoop]: trace histogram [1973, 1973, 1596, 986, 986, 986, 986, 986, 986, 986, 610, 377, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:14,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:14,652 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:14,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:14,655 INFO L82 PathProgramCache]: Analyzing trace with hash -982105371, now seen corresponding path program 20 times [2020-07-20 16:51:14,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:14,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [35814708] [2020-07-20 16:51:14,656 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 16:51:19,430 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:19,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:19,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 25886 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:51:19,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:18,463 INFO L134 CoverageAnalysis]: Checked inductivity of 10996742 backedges. 15500 proven. 151240 refuted. 0 times theorem prover too weak. 10830002 trivial. 0 not checked. [2020-07-20 16:52:18,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:22,108 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:52:22,212 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:52:23,608 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:52:23,726 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:52:23,848 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:52:23,968 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:52:26,102 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:52:26,228 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:52:26,364 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:52:26,495 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:52:29,599 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:52:29,719 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:52:29,864 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:52:30,014 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:52:35,439 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:52:35,594 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:52:35,754 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 16:52:35,913 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 16:52:44,337 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 16:52:44,511 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 16:52:44,697 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:52:44,886 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:52:45,067 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2020-07-20 16:52:45,234 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-20 16:52:45,399 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2020-07-20 16:52:45,557 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2020-07-20 16:52:45,702 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 16:52:45,850 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 16:52:45,986 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 16:52:46,119 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-20 16:52:46,241 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 16:52:46,354 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 16:52:46,463 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:52:46,566 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:54:10,598 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:54:10,703 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:54:11,710 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:54:11,827 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:54:11,950 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:54:12,072 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:54:13,602 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:54:13,728 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:54:13,861 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:54:13,995 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:54:16,385 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:54:16,524 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:54:16,671 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:54:16,824 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:54:20,691 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:54:20,846 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:54:21,007 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:54:21,171 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:54:27,378 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:54:27,548 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:54:27,722 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 16:54:27,895 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 16:54:28,050 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-20 16:54:28,190 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2020-07-20 16:54:28,329 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 16:54:28,451 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 16:54:28,568 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 16:54:28,687 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 16:54:28,794 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:54:28,897 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 16:54:29,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:29,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:23,248 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:55:23,352 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:55:23,472 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:55:23,587 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:55:24,628 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:55:24,748 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:55:24,878 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:55:25,019 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:55:26,674 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:55:26,807 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:55:26,949 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:55:27,086 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:55:29,688 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:55:29,837 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:55:30,081 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:55:30,230 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:55:34,378 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:55:34,535 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:55:34,708 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:55:34,872 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:55:35,034 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 16:55:35,183 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 16:55:35,330 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-20 16:55:35,470 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 16:55:35,608 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:55:35,736 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 16:55:35,854 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:55:35,970 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:55:36,078 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:55:36,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:36,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:09,109 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:56:09,215 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:56:09,940 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:56:10,047 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:56:10,163 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:56:10,281 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 49