/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Fibonacci01-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:16:04,198 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:16:04,200 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:16:04,212 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:16:04,212 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:16:04,213 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:16:04,214 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:16:04,216 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:16:04,218 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:16:04,219 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:16:04,220 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:16:04,222 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:16:04,223 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:16:04,230 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:16:04,231 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:16:04,232 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:16:04,233 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:16:04,234 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:16:04,237 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:16:04,239 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:16:04,244 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:16:04,245 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:16:04,247 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:16:04,248 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:16:04,252 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:16:04,264 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:16:04,265 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:16:04,267 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:16:04,268 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 19:16:04,303 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:16:04,303 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:16:04,307 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:16:04,307 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:16:04,307 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:16:04,307 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:16:04,308 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:16:04,308 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:16:04,308 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:16:04,308 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:16:04,308 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:16:04,309 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:16:04,309 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:16:04,309 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:16:04,309 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:16:04,310 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:16:04,310 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:16:04,310 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:16:04,310 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:16:04,311 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:16:04,311 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:16:04,311 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:16:04,311 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:16:04,311 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:16:04,311 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:16:04,312 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:16:04,312 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:04,312 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:16:04,312 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:16:04,312 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:16:04,585 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:16:04,604 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:16:04,607 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:16:04,608 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:16:04,609 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:16:04,610 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci01-1.c [2020-07-21 19:16:04,681 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f3c9e66b7/3d765c5b0457462a99f6915085328072/FLAG73814c6dd [2020-07-21 19:16:05,095 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:16:05,096 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci01-1.c [2020-07-21 19:16:05,102 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f3c9e66b7/3d765c5b0457462a99f6915085328072/FLAG73814c6dd [2020-07-21 19:16:05,490 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f3c9e66b7/3d765c5b0457462a99f6915085328072 [2020-07-21 19:16:05,500 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:16:05,503 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:16:05,504 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:16:05,504 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:16:05,508 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:16:05,509 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:16:05" (1/1) ... [2020-07-21 19:16:05,511 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63cceaae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:16:05, skipping insertion in model container [2020-07-21 19:16:05,511 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:16:05" (1/1) ... [2020-07-21 19:16:05,519 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:16:05,536 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:16:05,681 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:16:05,685 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:16:05,701 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:16:05,715 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:16:05,715 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:16:05 WrapperNode [2020-07-21 19:16:05,716 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:16:05,716 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:16:05,716 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:16:05,717 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:16:05,729 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:16:05" (1/1) ... [2020-07-21 19:16:05,729 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:16:05" (1/1) ... [2020-07-21 19:16:05,734 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:16:05" (1/1) ... [2020-07-21 19:16:05,734 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:16:05" (1/1) ... [2020-07-21 19:16:05,737 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:16:05" (1/1) ... [2020-07-21 19:16:05,738 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:16:05" (1/1) ... [2020-07-21 19:16:05,739 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:16:05" (1/1) ... [2020-07-21 19:16:05,740 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:16:05,740 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:16:05,741 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:16:05,741 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:16:05,741 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:16:05" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:16:05,876 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:16:05,876 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:16:05,876 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-07-21 19:16:05,877 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:16:05,877 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:16:05,877 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:16:05,877 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-07-21 19:16:05,877 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:16:05,877 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:16:05,878 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:16:06,052 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:16:06,052 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:16:06,055 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:16:06 BoogieIcfgContainer [2020-07-21 19:16:06,055 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:16:06,056 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:16:06,056 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:16:06,061 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:16:06,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:16:05" (1/3) ... [2020-07-21 19:16:06,062 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c491640 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:16:06, skipping insertion in model container [2020-07-21 19:16:06,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:16:05" (2/3) ... [2020-07-21 19:16:06,063 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c491640 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:16:06, skipping insertion in model container [2020-07-21 19:16:06,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:16:06" (3/3) ... [2020-07-21 19:16:06,065 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci01-1.c [2020-07-21 19:16:06,074 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:16:06,081 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:16:06,091 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:16:06,113 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:16:06,114 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:16:06,114 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:16:06,114 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:16:06,114 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:16:06,114 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:16:06,114 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:16:06,115 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:16:06,134 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 19:16:06,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 19:16:06,141 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:06,142 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:16:06,142 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:06,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:06,147 INFO L82 PathProgramCache]: Analyzing trace with hash 1900973920, now seen corresponding path program 1 times [2020-07-21 19:16:06,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:06,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1219040277] [2020-07-21 19:16:06,154 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:06,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:06,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:06,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 19:16:06,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:06,348 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:16:06,348 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:16:06,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1219040277] [2020-07-21 19:16:06,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:16:06,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 19:16:06,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405861078] [2020-07-21 19:16:06,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 19:16:06,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:06,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 19:16:06,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:16:06,371 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 6 states. [2020-07-21 19:16:06,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:06,532 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-07-21 19:16:06,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:16:06,534 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-21 19:16:06,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:06,545 INFO L225 Difference]: With dead ends: 36 [2020-07-21 19:16:06,545 INFO L226 Difference]: Without dead ends: 22 [2020-07-21 19:16:06,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-21 19:16:06,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-21 19:16:06,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-21 19:16:06,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 19:16:06,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-07-21 19:16:06,592 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 14 [2020-07-21 19:16:06,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:06,592 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-07-21 19:16:06,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 19:16:06,593 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-07-21 19:16:06,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 19:16:06,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:06,598 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:16:06,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:06,800 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:06,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:06,801 INFO L82 PathProgramCache]: Analyzing trace with hash -509871596, now seen corresponding path program 1 times [2020-07-21 19:16:06,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:06,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333478209] [2020-07-21 19:16:06,803 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:06,828 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:06,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:06,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 19:16:06,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:06,912 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:16:06,912 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:16:06,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333478209] [2020-07-21 19:16:06,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:16:06,913 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 19:16:06,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414375324] [2020-07-21 19:16:06,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 19:16:06,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:06,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 19:16:06,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:16:06,917 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 6 states. [2020-07-21 19:16:07,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:07,004 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-07-21 19:16:07,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:16:07,004 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-07-21 19:16:07,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:07,006 INFO L225 Difference]: With dead ends: 28 [2020-07-21 19:16:07,006 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 19:16:07,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-21 19:16:07,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 19:16:07,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2020-07-21 19:16:07,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 19:16:07,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-07-21 19:16:07,015 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 15 [2020-07-21 19:16:07,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:07,016 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-07-21 19:16:07,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 19:16:07,016 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-07-21 19:16:07,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:16:07,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:07,018 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] [2020-07-21 19:16:07,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:07,233 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:07,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:07,233 INFO L82 PathProgramCache]: Analyzing trace with hash 1203666899, now seen corresponding path program 1 times [2020-07-21 19:16:07,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:07,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [818460051] [2020-07-21 19:16:07,235 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:07,279 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:07,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:07,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 19:16:07,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:07,427 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:16:07,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:16:07,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:07,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:07,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:07,782 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:16:07,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [818460051] [2020-07-21 19:16:07,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:16:07,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 17 [2020-07-21 19:16:07,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478566577] [2020-07-21 19:16:07,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:16:07,785 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:07,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:16:07,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:16:07,786 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 17 states. [2020-07-21 19:16:07,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:07,964 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2020-07-21 19:16:07,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:16:07,965 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 27 [2020-07-21 19:16:07,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:07,967 INFO L225 Difference]: With dead ends: 34 [2020-07-21 19:16:07,967 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 19:16:07,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 34 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:16:07,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 19:16:07,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2020-07-21 19:16:07,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 19:16:07,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 35 transitions. [2020-07-21 19:16:07,977 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 35 transitions. Word has length 27 [2020-07-21 19:16:07,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:07,977 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 35 transitions. [2020-07-21 19:16:07,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:16:07,978 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 35 transitions. [2020-07-21 19:16:07,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 19:16:07,979 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:07,979 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, 1] [2020-07-21 19:16:08,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:08,189 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:08,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:08,190 INFO L82 PathProgramCache]: Analyzing trace with hash -603082491, now seen corresponding path program 1 times [2020-07-21 19:16:08,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:08,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1533318775] [2020-07-21 19:16:08,192 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:08,220 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:08,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:08,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 19:16:08,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:08,317 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 19:16:08,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:16:08,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:08,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:08,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:08,659 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:16:08,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1533318775] [2020-07-21 19:16:08,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:16:08,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 17 [2020-07-21 19:16:08,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225308959] [2020-07-21 19:16:08,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:16:08,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:08,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:16:08,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:16:08,663 INFO L87 Difference]: Start difference. First operand 27 states and 35 transitions. Second operand 17 states. [2020-07-21 19:16:08,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:08,887 INFO L93 Difference]: Finished difference Result 39 states and 56 transitions. [2020-07-21 19:16:08,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:16:08,887 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 28 [2020-07-21 19:16:08,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:08,889 INFO L225 Difference]: With dead ends: 39 [2020-07-21 19:16:08,889 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 19:16:08,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2020-07-21 19:16:08,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 19:16:08,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2020-07-21 19:16:08,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 19:16:08,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 51 transitions. [2020-07-21 19:16:08,914 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 51 transitions. Word has length 28 [2020-07-21 19:16:08,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:08,915 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 51 transitions. [2020-07-21 19:16:08,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:16:08,915 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 51 transitions. [2020-07-21 19:16:08,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 19:16:08,920 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:08,921 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, 1, 1] [2020-07-21 19:16:09,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:09,131 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:09,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:09,132 INFO L82 PathProgramCache]: Analyzing trace with hash -928122994, now seen corresponding path program 2 times [2020-07-21 19:16:09,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:09,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352589654] [2020-07-21 19:16:09,133 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:09,163 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:09,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:09,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:16:09,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:09,210 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 17 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 19:16:09,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:16:09,386 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 17 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 19:16:09,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352589654] [2020-07-21 19:16:09,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:16:09,387 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2020-07-21 19:16:09,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585201382] [2020-07-21 19:16:09,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:16:09,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:09,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:16:09,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:16:09,388 INFO L87 Difference]: Start difference. First operand 34 states and 51 transitions. Second operand 11 states. [2020-07-21 19:16:09,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:09,565 INFO L93 Difference]: Finished difference Result 68 states and 116 transitions. [2020-07-21 19:16:09,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:16:09,566 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 19:16:09,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:09,570 INFO L225 Difference]: With dead ends: 68 [2020-07-21 19:16:09,570 INFO L226 Difference]: Without dead ends: 41 [2020-07-21 19:16:09,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 72 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=166, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:16:09,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-07-21 19:16:09,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-07-21 19:16:09,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 19:16:09,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2020-07-21 19:16:09,591 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 41 [2020-07-21 19:16:09,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:09,593 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2020-07-21 19:16:09,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:16:09,603 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2020-07-21 19:16:09,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 19:16:09,605 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:09,606 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, 1] [2020-07-21 19:16:09,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:09,807 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:09,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:09,808 INFO L82 PathProgramCache]: Analyzing trace with hash 1952548262, now seen corresponding path program 2 times [2020-07-21 19:16:09,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:09,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1527429154] [2020-07-21 19:16:09,809 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:09,845 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:09,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:09,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 19:16:09,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:09,877 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 19:16:09,877 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:16:09,877 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1527429154] [2020-07-21 19:16:09,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:16:09,878 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 19:16:09,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117119563] [2020-07-21 19:16:09,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 19:16:09,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:09,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 19:16:09,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:16:09,879 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand 6 states. [2020-07-21 19:16:09,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:09,978 INFO L93 Difference]: Finished difference Result 62 states and 83 transitions. [2020-07-21 19:16:09,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:16:09,979 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 40 [2020-07-21 19:16:09,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:09,980 INFO L225 Difference]: With dead ends: 62 [2020-07-21 19:16:09,982 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 19:16:09,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:16:09,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 19:16:09,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-21 19:16:09,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:16:09,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2020-07-21 19:16:09,993 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 40 [2020-07-21 19:16:09,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:09,993 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2020-07-21 19:16:09,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 19:16:09,993 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2020-07-21 19:16:09,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 19:16:10,000 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:10,000 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, 1, 1] [2020-07-21 19:16:10,201 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:10,202 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:10,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:10,202 INFO L82 PathProgramCache]: Analyzing trace with hash -2046185202, now seen corresponding path program 3 times [2020-07-21 19:16:10,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:10,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1193257669] [2020-07-21 19:16:10,203 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:10,232 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:10,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:10,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:16:10,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:10,275 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 22 proven. 12 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:16:10,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:16:10,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:10,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:10,547 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-21 19:16:10,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1193257669] [2020-07-21 19:16:10,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:16:10,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 19:16:10,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107729620] [2020-07-21 19:16:10,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:16:10,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:10,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:16:10,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:16:10,549 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand 11 states. [2020-07-21 19:16:10,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:10,671 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2020-07-21 19:16:10,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:16:10,671 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 19:16:10,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:10,672 INFO L225 Difference]: With dead ends: 57 [2020-07-21 19:16:10,672 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 19:16:10,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=163, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:16:10,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 19:16:10,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 19:16:10,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 19:16:10,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2020-07-21 19:16:10,682 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 41 [2020-07-21 19:16:10,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:10,683 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2020-07-21 19:16:10,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:16:10,684 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2020-07-21 19:16:10,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-21 19:16:10,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:10,686 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, 1] [2020-07-21 19:16:10,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:10,900 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:10,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:10,900 INFO L82 PathProgramCache]: Analyzing trace with hash 1391487784, now seen corresponding path program 4 times [2020-07-21 19:16:10,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:10,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [953861163] [2020-07-21 19:16:10,901 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:10,930 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:10,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:10,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 19:16:10,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:11,070 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:16:11,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:16:11,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:11,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:11,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:11,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:11,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:11,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:11,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:11,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:11,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:11,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:11,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:11,746 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-21 19:16:11,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [953861163] [2020-07-21 19:16:11,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:16:11,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16] total 23 [2020-07-21 19:16:11,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511210287] [2020-07-21 19:16:11,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:16:11,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:11,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:16:11,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:16:11,749 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand 23 states. [2020-07-21 19:16:12,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:12,138 INFO L93 Difference]: Finished difference Result 51 states and 69 transitions. [2020-07-21 19:16:12,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 19:16:12,139 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 42 [2020-07-21 19:16:12,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:12,141 INFO L225 Difference]: With dead ends: 51 [2020-07-21 19:16:12,141 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 19:16:12,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 54 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=204, Invalid=918, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 19:16:12,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 19:16:12,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2020-07-21 19:16:12,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-21 19:16:12,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 60 transitions. [2020-07-21 19:16:12,151 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 60 transitions. Word has length 42 [2020-07-21 19:16:12,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:12,151 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 60 transitions. [2020-07-21 19:16:12,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:16:12,152 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 60 transitions. [2020-07-21 19:16:12,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-07-21 19:16:12,153 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:12,153 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:16:12,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:12,359 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:12,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:12,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1434057987, now seen corresponding path program 5 times [2020-07-21 19:16:12,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:12,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267375185] [2020-07-21 19:16:12,362 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:12,408 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:12,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:12,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:16:12,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:12,479 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 72 proven. 104 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-07-21 19:16:12,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:16:12,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:12,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:12,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:12,903 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 72 proven. 107 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-07-21 19:16:12,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267375185] [2020-07-21 19:16:12,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:16:12,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 19:16:12,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631187135] [2020-07-21 19:16:12,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:16:12,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:12,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:16:12,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:16:12,905 INFO L87 Difference]: Start difference. First operand 43 states and 60 transitions. Second operand 13 states. [2020-07-21 19:16:13,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:13,125 INFO L93 Difference]: Finished difference Result 88 states and 136 transitions. [2020-07-21 19:16:13,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:16:13,125 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 83 [2020-07-21 19:16:13,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:13,127 INFO L225 Difference]: With dead ends: 88 [2020-07-21 19:16:13,129 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 19:16:13,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 145 SyntacticMatches, 9 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=122, Invalid=258, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:16:13,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 19:16:13,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2020-07-21 19:16:13,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:16:13,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 59 transitions. [2020-07-21 19:16:13,148 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 59 transitions. Word has length 83 [2020-07-21 19:16:13,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:13,148 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 59 transitions. [2020-07-21 19:16:13,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:16:13,148 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 59 transitions. [2020-07-21 19:16:13,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-07-21 19:16:13,149 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:13,150 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, 1] [2020-07-21 19:16:13,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:13,351 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:13,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:13,352 INFO L82 PathProgramCache]: Analyzing trace with hash -168777920, now seen corresponding path program 6 times [2020-07-21 19:16:13,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:13,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212496301] [2020-07-21 19:16:13,353 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:13,415 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:13,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:13,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:16:13,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:13,527 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 106 proven. 170 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2020-07-21 19:16:13,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:16:13,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:13,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:14,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:14,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:14,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:14,326 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 106 proven. 182 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2020-07-21 19:16:14,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1212496301] [2020-07-21 19:16:14,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:16:14,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:16:14,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220671737] [2020-07-21 19:16:14,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:16:14,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:14,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:16:14,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:16:14,329 INFO L87 Difference]: Start difference. First operand 46 states and 59 transitions. Second operand 17 states. [2020-07-21 19:16:14,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:14,695 INFO L93 Difference]: Finished difference Result 106 states and 164 transitions. [2020-07-21 19:16:14,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 19:16:14,696 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 97 [2020-07-21 19:16:14,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:14,698 INFO L225 Difference]: With dead ends: 106 [2020-07-21 19:16:14,698 INFO L226 Difference]: Without dead ends: 69 [2020-07-21 19:16:14,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 169 SyntacticMatches, 13 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=237, Invalid=575, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:16:14,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-21 19:16:14,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 60. [2020-07-21 19:16:14,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 19:16:14,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 84 transitions. [2020-07-21 19:16:14,710 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 84 transitions. Word has length 97 [2020-07-21 19:16:14,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:14,710 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 84 transitions. [2020-07-21 19:16:14,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:16:14,711 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 84 transitions. [2020-07-21 19:16:14,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-07-21 19:16:14,712 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:14,712 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 14, 8, 8, 8, 8, 8, 8, 8, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:16:14,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:14,920 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:14,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:14,921 INFO L82 PathProgramCache]: Analyzing trace with hash -680629368, now seen corresponding path program 7 times [2020-07-21 19:16:14,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:14,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [469435407] [2020-07-21 19:16:14,923 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:15,001 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:15,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:15,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:16:15,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:15,109 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 197 proven. 276 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2020-07-21 19:16:15,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:16:15,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:15,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:15,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:15,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:15,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:16,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:16,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:16,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:16,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:16,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:16,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:16,485 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 197 proven. 306 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2020-07-21 19:16:16,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [469435407] [2020-07-21 19:16:16,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:16:16,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:16:16,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153961495] [2020-07-21 19:16:16,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:16:16,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:16,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:16:16,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:16:16,490 INFO L87 Difference]: Start difference. First operand 60 states and 84 transitions. Second operand 21 states. [2020-07-21 19:16:16,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:16,984 INFO L93 Difference]: Finished difference Result 130 states and 222 transitions. [2020-07-21 19:16:16,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 19:16:16,986 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 124 [2020-07-21 19:16:16,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:16,989 INFO L225 Difference]: With dead ends: 130 [2020-07-21 19:16:16,989 INFO L226 Difference]: Without dead ends: 79 [2020-07-21 19:16:16,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 211 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=363, Invalid=969, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 19:16:16,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-07-21 19:16:17,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2020-07-21 19:16:17,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 19:16:17,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 97 transitions. [2020-07-21 19:16:17,008 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 97 transitions. Word has length 124 [2020-07-21 19:16:17,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:17,010 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 97 transitions. [2020-07-21 19:16:17,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:16:17,010 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 97 transitions. [2020-07-21 19:16:17,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-21 19:16:17,014 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:17,015 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 23, 14, 14, 14, 14, 14, 14, 14, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:16:17,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:17,228 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:17,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:17,229 INFO L82 PathProgramCache]: Analyzing trace with hash -1288458278, now seen corresponding path program 8 times [2020-07-21 19:16:17,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:17,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [325844668] [2020-07-21 19:16:17,230 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:17,328 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:17,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:17,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:16:17,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:17,467 INFO L134 CoverageAnalysis]: Checked inductivity of 2241 backedges. 453 proven. 730 refuted. 0 times theorem prover too weak. 1058 trivial. 0 not checked. [2020-07-21 19:16:17,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:16:18,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:18,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:18,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:18,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:19,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:19,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:19,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:19,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:19,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:19,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:19,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:19,813 INFO L134 CoverageAnalysis]: Checked inductivity of 2241 backedges. 453 proven. 782 refuted. 0 times theorem prover too weak. 1006 trivial. 0 not checked. [2020-07-21 19:16:19,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [325844668] [2020-07-21 19:16:19,815 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:16:19,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 19:16:19,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902615984] [2020-07-21 19:16:19,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:16:19,817 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:19,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:16:19,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:16:19,819 INFO L87 Difference]: Start difference. First operand 72 states and 97 transitions. Second operand 25 states. [2020-07-21 19:16:20,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:20,614 INFO L93 Difference]: Finished difference Result 157 states and 259 transitions. [2020-07-21 19:16:20,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 19:16:20,615 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 205 [2020-07-21 19:16:20,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:20,617 INFO L225 Difference]: With dead ends: 157 [2020-07-21 19:16:20,617 INFO L226 Difference]: Without dead ends: 94 [2020-07-21 19:16:20,618 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 365 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=539, Invalid=1531, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 19:16:20,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-07-21 19:16:20,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2020-07-21 19:16:20,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-07-21 19:16:20,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 112 transitions. [2020-07-21 19:16:20,628 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 112 transitions. Word has length 205 [2020-07-21 19:16:20,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:20,629 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 112 transitions. [2020-07-21 19:16:20,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:16:20,629 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 112 transitions. [2020-07-21 19:16:20,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-07-21 19:16:20,631 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:20,631 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, 1] [2020-07-21 19:16:20,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:20,846 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:20,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:20,847 INFO L82 PathProgramCache]: Analyzing trace with hash 375112636, now seen corresponding path program 9 times [2020-07-21 19:16:20,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:20,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [696912801] [2020-07-21 19:16:20,848 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:20,951 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:16:20,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:20,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 65 conjunts are in the unsatisfiable core [2020-07-21 19:16:20,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:21,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 258 proven. 604 refuted. 0 times theorem prover too weak. 792 trivial. 0 not checked. [2020-07-21 19:16:21,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:16:22,315 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 19:16:22,440 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 19:16:22,577 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 19:16:22,709 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 19:16:23,318 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 19:16:23,580 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 19:16:23,827 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 146 [2020-07-21 19:16:24,072 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 146 [2020-07-21 19:16:26,267 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 19:16:26,403 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 19:16:26,535 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 19:16:26,666 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 19:16:27,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:27,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:27,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:28,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:28,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:29,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:30,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:30,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:30,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:30,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:30,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:30,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:16:30,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 207 proven. 695 refuted. 0 times theorem prover too weak. 752 trivial. 0 not checked. [2020-07-21 19:16:30,134 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [696912801] [2020-07-21 19:16:30,134 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:16:30,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 35] total 48 [2020-07-21 19:16:30,135 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250189918] [2020-07-21 19:16:30,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 19:16:30,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:16:30,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 19:16:30,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=1962, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 19:16:30,137 INFO L87 Difference]: Start difference. First operand 84 states and 112 transitions. Second operand 48 states. [2020-07-21 19:16:31,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:31,116 INFO L93 Difference]: Finished difference Result 90 states and 121 transitions. [2020-07-21 19:16:31,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 19:16:31,118 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 178 [2020-07-21 19:16:31,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:31,119 INFO L225 Difference]: With dead ends: 90 [2020-07-21 19:16:31,119 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 19:16:31,122 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 268 SyntacticMatches, 41 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2291 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=658, Invalid=4034, Unknown=0, NotChecked=0, Total=4692 [2020-07-21 19:16:31,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 19:16:31,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 19:16:31,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 19:16:31,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 19:16:31,122 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 178 [2020-07-21 19:16:31,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:31,123 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 19:16:31,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 19:16:31,123 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 19:16:31,123 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 19:16:31,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:31,327 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 19:16:31,801 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 7 [2020-07-21 19:16:32,129 WARN L193 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 19 [2020-07-21 19:16:32,133 INFO L268 CegarLoopResult]: For program point fibonacciFINAL(lines 14 22) no Hoare annotation was computed. [2020-07-21 19:16:32,133 INFO L271 CegarLoopResult]: At program point fibonacciENTRY(lines 14 22) the Hoare annotation is: true [2020-07-21 19:16:32,133 INFO L264 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (and (<= |fibonacci_#in~n| fibonacci_~n) (<= 2 |fibonacci_#in~n|) (<= fibonacci_~n |fibonacci_#in~n|)) [2020-07-21 19:16:32,134 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-07-21 19:16:32,134 INFO L264 CegarLoopResult]: At program point L20-2(line 20) the Hoare annotation is: (and (<= 1 |fibonacci_#t~ret0|) (<= |fibonacci_#in~n| fibonacci_~n) (<= 2 |fibonacci_#in~n|) (or (and (<= 2 |fibonacci_#t~ret0|) (< |fibonacci_#in~n| (+ |fibonacci_#t~ret0| 5))) (<= |fibonacci_#in~n| 3)) (<= fibonacci_~n |fibonacci_#in~n|)) [2020-07-21 19:16:32,134 INFO L268 CegarLoopResult]: For program point fibonacciEXIT(lines 14 22) no Hoare annotation was computed. [2020-07-21 19:16:32,134 INFO L268 CegarLoopResult]: For program point L17(lines 17 21) no Hoare annotation was computed. [2020-07-21 19:16:32,134 INFO L268 CegarLoopResult]: For program point L20-3(line 20) no Hoare annotation was computed. [2020-07-21 19:16:32,134 INFO L268 CegarLoopResult]: For program point L15(lines 15 21) no Hoare annotation was computed. [2020-07-21 19:16:32,135 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 19:16:32,135 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:16:32,135 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:16:32,135 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 19:16:32,135 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 19:16:32,135 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 19:16:32,135 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 34) no Hoare annotation was computed. [2020-07-21 19:16:32,136 INFO L268 CegarLoopResult]: For program point L31(lines 31 35) no Hoare annotation was computed. [2020-07-21 19:16:32,136 INFO L271 CegarLoopResult]: At program point L30(line 30) the Hoare annotation is: true [2020-07-21 19:16:32,136 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 25 36) the Hoare annotation is: true [2020-07-21 19:16:32,136 INFO L268 CegarLoopResult]: For program point L30-1(line 30) no Hoare annotation was computed. [2020-07-21 19:16:32,136 INFO L268 CegarLoopResult]: For program point L27(lines 27 29) no Hoare annotation was computed. [2020-07-21 19:16:32,136 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 25 36) no Hoare annotation was computed. [2020-07-21 19:16:32,136 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 25 36) no Hoare annotation was computed. [2020-07-21 19:16:32,136 INFO L268 CegarLoopResult]: For program point L34(line 34) no Hoare annotation was computed. [2020-07-21 19:16:32,141 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:16:32 BoogieIcfgContainer [2020-07-21 19:16:32,141 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:16:32,143 INFO L168 Benchmark]: Toolchain (without parser) took 26640.89 ms. Allocated memory was 138.9 MB in the beginning and 428.3 MB in the end (delta: 289.4 MB). Free memory was 103.4 MB in the beginning and 312.6 MB in the end (delta: -209.3 MB). Peak memory consumption was 290.2 MB. Max. memory is 7.1 GB. [2020-07-21 19:16:32,143 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 138.9 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 19:16:32,144 INFO L168 Benchmark]: CACSL2BoogieTranslator took 211.88 ms. Allocated memory is still 138.9 MB. Free memory was 102.9 MB in the beginning and 93.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 19:16:32,145 INFO L168 Benchmark]: Boogie Preprocessor took 23.69 ms. Allocated memory is still 138.9 MB. Free memory was 93.6 MB in the beginning and 92.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 19:16:32,145 INFO L168 Benchmark]: RCFGBuilder took 315.18 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 92.2 MB in the beginning and 169.6 MB in the end (delta: -77.4 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-21 19:16:32,146 INFO L168 Benchmark]: TraceAbstraction took 26084.82 ms. Allocated memory was 202.4 MB in the beginning and 428.3 MB in the end (delta: 226.0 MB). Free memory was 169.6 MB in the beginning and 312.6 MB in the end (delta: -143.0 MB). Peak memory consumption was 293.0 MB. Max. memory is 7.1 GB. [2020-07-21 19:16:32,149 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 138.9 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 211.88 ms. Allocated memory is still 138.9 MB. Free memory was 102.9 MB in the beginning and 93.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.69 ms. Allocated memory is still 138.9 MB. Free memory was 93.6 MB in the beginning and 92.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 315.18 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 92.2 MB in the beginning and 169.6 MB in the end (delta: -77.4 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 26084.82 ms. Allocated memory was 202.4 MB in the beginning and 428.3 MB in the end (delta: 226.0 MB). Free memory was 169.6 MB in the beginning and 312.6 MB in the end (delta: -143.0 MB). Peak memory consumption was 293.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 34]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 25.2s, OverallIterations: 13, TraceHistogramMax: 29, AutomataDifference: 4.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.8s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 258 SDtfs, 932 SDslu, 1278 SDs, 0 SdLazy, 2234 SolverSat, 1152 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1912 GetRequests, 1478 SyntacticMatches, 127 SemanticMatches, 307 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3565 ImplicationChecksByTransitivity, 4.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=84occurred in iteration=12, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 13 MinimizatonAttempts, 45 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 167 PreInvPairs, 212 NumberOfFragments, 42 HoareAnnotationTreeSize, 167 FomulaSimplifications, 434 FormulaSimplificationTreeSizeReduction, 0.3s HoareSimplificationTime, 8 FomulaSimplificationsInter, 1548 FormulaSimplificationTreeSizeReductionInter, 0.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 17.1s InterpolantComputationTime, 935 NumberOfCodeBlocks, 935 NumberOfCodeBlocksAsserted, 26 NumberOfCheckSat, 1778 ConstructedInterpolants, 0 QuantifiedInterpolants, 542826 SizeOfPredicates, 78 NumberOfNonLiveVariables, 2113 ConjunctsInSsa, 207 ConjunctsInUnsatCore, 23 InterpolantComputations, 3 PerfectInterpolantSequences, 7013/11113 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...