/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:35:35,789 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:35:35,791 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:35:35,803 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 21:35:35,814 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:35:35,815 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:35:35,816 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:35:35,817 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:35:35,818 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:35:35,819 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:35:35,820 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:35:35,822 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:35:35,824 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:35:35,825 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:35:35,826 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:35:35,827 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:35:35,829 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:35:35,837 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:35:35,838 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:35:35,838 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:35:35,839 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 21:35:35,857 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:35:35,857 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:35:35,858 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:35:35,859 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:35:35,859 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:35:35,859 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:35:35,859 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:35:35,860 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:35:35,860 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:35:35,860 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:35:35,860 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:35:35,860 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:35:35,860 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:35:35,861 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:35:35,861 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:35:35,861 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:35:35,861 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:35:35,861 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:35:35,862 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:35:35,862 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:35:35,862 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:35:35,862 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:35:35,863 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:35:35,863 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:35:35,863 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:35:35,863 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:35:35,863 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:35,863 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:35:35,864 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:35:35,864 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 -> 4 [2020-07-20 21:35:36,167 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:35:36,185 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:35:36,188 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:35:36,190 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:35:36,190 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:35:36,191 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-1.c [2020-07-20 21:35:36,270 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47b5f5e74/4050d63f34d44bfca939ad8bb2418e83/FLAGc5f6d1f02 [2020-07-20 21:35:36,737 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:35:36,738 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-1.c [2020-07-20 21:35:36,747 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47b5f5e74/4050d63f34d44bfca939ad8bb2418e83/FLAGc5f6d1f02 [2020-07-20 21:35:37,113 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47b5f5e74/4050d63f34d44bfca939ad8bb2418e83 [2020-07-20 21:35:37,124 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:35:37,128 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:35:37,129 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:35:37,129 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:35:37,133 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:35:37,134 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:35:37" (1/1) ... [2020-07-20 21:35:37,137 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6bdabeeb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:37, skipping insertion in model container [2020-07-20 21:35:37,137 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:35:37" (1/1) ... [2020-07-20 21:35:37,145 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:35:37,164 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:35:37,331 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:35:37,336 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:35:37,353 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:35:37,368 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:35:37,368 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:37 WrapperNode [2020-07-20 21:35:37,369 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:35:37,369 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:35:37,370 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:35:37,370 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:35:37,381 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:37" (1/1) ... [2020-07-20 21:35:37,382 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:37" (1/1) ... [2020-07-20 21:35:37,386 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:37" (1/1) ... [2020-07-20 21:35:37,387 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:37" (1/1) ... [2020-07-20 21:35:37,474 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:37" (1/1) ... [2020-07-20 21:35:37,476 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:37" (1/1) ... [2020-07-20 21:35:37,477 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:37" (1/1) ... [2020-07-20 21:35:37,479 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:35:37,479 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:35:37,480 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:35:37,480 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:35:37,481 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:37" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:35:37,551 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:35:37,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:35:37,552 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 21:35:37,552 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 21:35:37,552 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:35:37,552 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:35:37,552 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:35:37,553 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 21:35:37,553 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 21:35:37,553 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:35:37,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:35:37,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:35:37,753 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:35:37,753 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:35:37,758 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:35:37 BoogieIcfgContainer [2020-07-20 21:35:37,758 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:35:37,760 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:35:37,760 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:35:37,763 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:35:37,763 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:35:37" (1/3) ... [2020-07-20 21:35:37,764 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bde21e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:35:37, skipping insertion in model container [2020-07-20 21:35:37,765 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:37" (2/3) ... [2020-07-20 21:35:37,765 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bde21e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:35:37, skipping insertion in model container [2020-07-20 21:35:37,765 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:35:37" (3/3) ... [2020-07-20 21:35:37,767 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-1.c [2020-07-20 21:35:37,778 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:35:37,786 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:35:37,803 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:35:37,835 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:35:37,835 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:35:37,835 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:35:37,835 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:35:37,835 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:35:37,836 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:35:37,836 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:35:37,836 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:35:37,861 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 21:35:37,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:35:37,871 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:37,872 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:37,873 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:37,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:37,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 21:35:37,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:37,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [407381495] [2020-07-20 21:35:37,891 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:37,964 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:37,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:37,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:35:37,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:38,071 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:35:38,072 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:35:38,073 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [407381495] [2020-07-20 21:35:38,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:35:38,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:35:38,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823198308] [2020-07-20 21:35:38,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:35:38,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:38,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:35:38,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:35:38,093 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 21:35:38,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:38,224 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 21:35:38,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:35:38,228 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:35:38,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:38,239 INFO L225 Difference]: With dead ends: 44 [2020-07-20 21:35:38,240 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 21:35:38,243 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:35:38,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 21:35:38,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 21:35:38,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:35:38,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:35:38,290 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 21:35:38,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:38,291 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:35:38,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:35:38,291 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:35:38,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:35:38,293 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:38,294 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:38,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:38,512 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:38,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:38,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 21:35:38,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:38,514 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754076331] [2020-07-20 21:35:38,514 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:38,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:38,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:38,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:35:38,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:38,591 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:35:38,592 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:35:38,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754076331] [2020-07-20 21:35:38,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:35:38,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:35:38,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506586468] [2020-07-20 21:35:38,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:35:38,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:38,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:35:38,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:35:38,598 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 21:35:38,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:38,677 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 21:35:38,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:35:38,678 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:35:38,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:38,680 INFO L225 Difference]: With dead ends: 36 [2020-07-20 21:35:38,680 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 21:35:38,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:35:38,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 21:35:38,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 21:35:38,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:35:38,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:35:38,692 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 21:35:38,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:38,692 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:35:38,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:35:38,693 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:35:38,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:35:38,694 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:38,695 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:38,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:38,911 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:38,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:38,912 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 21:35:38,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:38,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1672892065] [2020-07-20 21:35:38,914 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:38,943 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:38,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:38,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:35:38,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:39,019 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:35:39,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:39,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:39,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:39,295 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:35:39,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1672892065] [2020-07-20 21:35:39,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:39,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:35:39,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424080779] [2020-07-20 21:35:39,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:35:39,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:39,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:35:39,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:35:39,307 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 21:35:39,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:39,477 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 21:35:39,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:35:39,478 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 21:35:39,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:39,481 INFO L225 Difference]: With dead ends: 41 [2020-07-20 21:35:39,481 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 21:35:39,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:35:39,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 21:35:39,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 21:35:39,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:35:39,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:35:39,506 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 21:35:39,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:39,506 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:35:39,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:35:39,507 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:35:39,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:35:39,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:39,511 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:39,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:39,726 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:39,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:39,727 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 21:35:39,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:39,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261459579] [2020-07-20 21:35:39,728 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:39,777 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:39,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:39,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:35:39,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:39,816 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:35:39,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:39,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:39,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:39,999 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:35:40,000 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261459579] [2020-07-20 21:35:40,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:40,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:35:40,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417195252] [2020-07-20 21:35:40,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:35:40,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:40,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:35:40,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:35:40,002 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 21:35:40,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:40,116 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 21:35:40,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:35:40,117 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 21:35:40,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:40,119 INFO L225 Difference]: With dead ends: 46 [2020-07-20 21:35:40,119 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 21:35:40,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:35:40,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 21:35:40,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 21:35:40,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:35:40,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:35:40,130 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 21:35:40,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:40,130 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:35:40,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:35:40,130 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:35:40,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:35:40,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:40,132 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:40,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:40,347 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:40,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:40,349 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 21:35:40,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:40,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2008674307] [2020-07-20 21:35:40,350 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:40,388 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:40,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:40,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:35:40,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:40,465 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 21:35:40,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:40,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:40,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:40,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:40,876 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:35:40,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2008674307] [2020-07-20 21:35:40,877 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:40,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:35:40,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336153419] [2020-07-20 21:35:40,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:35:40,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:40,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:35:40,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:35:40,879 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 21:35:41,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:41,054 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 21:35:41,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:35:41,055 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 21:35:41,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:41,057 INFO L225 Difference]: With dead ends: 51 [2020-07-20 21:35:41,057 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 21:35:41,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:35:41,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 21:35:41,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 21:35:41,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:35:41,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:35:41,068 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 21:35:41,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:41,069 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:35:41,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:35:41,069 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:35:41,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 21:35:41,071 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:41,071 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:41,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:41,286 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:41,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:41,286 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 21:35:41,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:41,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [400724964] [2020-07-20 21:35:41,288 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:41,318 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:41,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:41,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:35:41,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:41,363 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 21:35:41,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:41,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:41,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:41,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:41,689 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:35:41,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [400724964] [2020-07-20 21:35:41,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:41,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:35:41,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670929719] [2020-07-20 21:35:41,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:35:41,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:41,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:35:41,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:35:41,692 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 11 states. [2020-07-20 21:35:41,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:41,837 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 21:35:41,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:35:41,838 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 40 [2020-07-20 21:35:41,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:41,840 INFO L225 Difference]: With dead ends: 56 [2020-07-20 21:35:41,840 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 21:35:41,841 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:35:41,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 21:35:41,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 21:35:41,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:35:41,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:35:41,851 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 21:35:41,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:41,852 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:35:41,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:35:41,853 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:35:41,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 21:35:41,855 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:41,855 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:42,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:42,069 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:42,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:42,070 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 21:35:42,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:42,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [476646563] [2020-07-20 21:35:42,070 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:42,111 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:42,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:42,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:35:42,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:42,175 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 21:35:42,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:42,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:42,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:42,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:42,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:42,746 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 21:35:42,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [476646563] [2020-07-20 21:35:42,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:42,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:35:42,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483266292] [2020-07-20 21:35:42,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:35:42,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:42,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:35:42,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:35:42,748 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 13 states. [2020-07-20 21:35:42,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:42,939 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 21:35:42,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:35:42,940 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 52 [2020-07-20 21:35:42,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:42,942 INFO L225 Difference]: With dead ends: 61 [2020-07-20 21:35:42,942 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 21:35:42,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:35:42,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 21:35:42,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 21:35:42,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:35:42,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:35:42,953 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 21:35:42,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:42,954 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:35:42,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:35:42,954 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:35:42,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 21:35:42,957 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:42,957 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:43,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:43,166 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:43,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:43,167 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 21:35:43,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:43,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10901816] [2020-07-20 21:35:43,169 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:43,210 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:43,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:43,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:35:43,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:43,267 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 21:35:43,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:43,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:43,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:43,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:43,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:43,620 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-07-20 21:35:43,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10901816] [2020-07-20 21:35:43,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:43,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:35:43,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020654985] [2020-07-20 21:35:43,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:35:43,623 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:43,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:35:43,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:35:43,623 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 11 states. [2020-07-20 21:35:43,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:43,794 INFO L93 Difference]: Finished difference Result 69 states and 116 transitions. [2020-07-20 21:35:43,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:35:43,794 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 54 [2020-07-20 21:35:43,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:43,796 INFO L225 Difference]: With dead ends: 69 [2020-07-20 21:35:43,797 INFO L226 Difference]: Without dead ends: 65 [2020-07-20 21:35:43,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 94 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:35:43,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-20 21:35:43,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 47. [2020-07-20 21:35:43,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 21:35:43,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 68 transitions. [2020-07-20 21:35:43,810 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 68 transitions. Word has length 54 [2020-07-20 21:35:43,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:43,811 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 68 transitions. [2020-07-20 21:35:43,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:35:43,811 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 68 transitions. [2020-07-20 21:35:43,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 21:35:43,813 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:43,813 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:44,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:44,029 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:44,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:44,029 INFO L82 PathProgramCache]: Analyzing trace with hash -242988780, now seen corresponding path program 1 times [2020-07-20 21:35:44,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:44,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156494815] [2020-07-20 21:35:44,031 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:44,071 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:44,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:44,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:35:44,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:44,128 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-20 21:35:44,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:44,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:44,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:44,313 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-20 21:35:44,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156494815] [2020-07-20 21:35:44,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:44,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 21:35:44,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712142821] [2020-07-20 21:35:44,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:35:44,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:44,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:35:44,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:35:44,316 INFO L87 Difference]: Start difference. First operand 47 states and 68 transitions. Second operand 9 states. [2020-07-20 21:35:44,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:44,438 INFO L93 Difference]: Finished difference Result 61 states and 93 transitions. [2020-07-20 21:35:44,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:35:44,439 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 55 [2020-07-20 21:35:44,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:44,442 INFO L225 Difference]: With dead ends: 61 [2020-07-20 21:35:44,442 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 21:35:44,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 98 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:35:44,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 21:35:44,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 49. [2020-07-20 21:35:44,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-20 21:35:44,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 73 transitions. [2020-07-20 21:35:44,467 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 73 transitions. Word has length 55 [2020-07-20 21:35:44,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:44,468 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 73 transitions. [2020-07-20 21:35:44,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:35:44,468 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 73 transitions. [2020-07-20 21:35:44,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 21:35:44,474 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:44,474 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:44,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:44,691 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:44,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:44,691 INFO L82 PathProgramCache]: Analyzing trace with hash 643857677, now seen corresponding path program 1 times [2020-07-20 21:35:44,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:44,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [693746470] [2020-07-20 21:35:44,692 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:44,745 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:44,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:44,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:35:44,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:44,807 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 30 proven. 11 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2020-07-20 21:35:44,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:45,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:45,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:45,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:45,170 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 30 proven. 12 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 21:35:45,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [693746470] [2020-07-20 21:35:45,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:45,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:35:45,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794366989] [2020-07-20 21:35:45,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:35:45,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:45,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:35:45,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:35:45,173 INFO L87 Difference]: Start difference. First operand 49 states and 73 transitions. Second operand 11 states. [2020-07-20 21:35:45,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:45,315 INFO L93 Difference]: Finished difference Result 66 states and 108 transitions. [2020-07-20 21:35:45,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:35:45,316 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 67 [2020-07-20 21:35:45,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:45,318 INFO L225 Difference]: With dead ends: 66 [2020-07-20 21:35:45,318 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 21:35:45,320 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 117 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:35:45,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 21:35:45,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2020-07-20 21:35:45,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-20 21:35:45,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 80 transitions. [2020-07-20 21:35:45,330 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 80 transitions. Word has length 67 [2020-07-20 21:35:45,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:45,330 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 80 transitions. [2020-07-20 21:35:45,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:35:45,331 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 80 transitions. [2020-07-20 21:35:45,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 21:35:45,332 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:45,332 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:45,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:45,547 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:45,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:45,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 2 times [2020-07-20 21:35:45,549 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:45,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1080464194] [2020-07-20 21:35:45,549 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:45,600 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:35:45,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:45,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 21:35:45,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:45,786 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2020-07-20 21:35:45,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:46,220 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2020-07-20 21:35:46,221 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1080464194] [2020-07-20 21:35:46,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:46,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 21 [2020-07-20 21:35:46,222 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875711353] [2020-07-20 21:35:46,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:35:46,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:46,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:35:46,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=373, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:35:46,223 INFO L87 Difference]: Start difference. First operand 52 states and 80 transitions. Second operand 21 states. [2020-07-20 21:35:46,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:46,450 INFO L93 Difference]: Finished difference Result 94 states and 186 transitions. [2020-07-20 21:35:46,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 21:35:46,450 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 68 [2020-07-20 21:35:46,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:46,454 INFO L225 Difference]: With dead ends: 94 [2020-07-20 21:35:46,454 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 21:35:46,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=411, Unknown=0, NotChecked=0, Total=462 [2020-07-20 21:35:46,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 21:35:46,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 73. [2020-07-20 21:35:46,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-20 21:35:46,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 142 transitions. [2020-07-20 21:35:46,489 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 142 transitions. Word has length 68 [2020-07-20 21:35:46,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:46,490 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 142 transitions. [2020-07-20 21:35:46,490 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:35:46,490 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 142 transitions. [2020-07-20 21:35:46,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-20 21:35:46,495 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:46,496 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:46,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:46,697 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:46,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:46,698 INFO L82 PathProgramCache]: Analyzing trace with hash -908952008, now seen corresponding path program 2 times [2020-07-20 21:35:46,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:46,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152612682] [2020-07-20 21:35:46,699 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:46,749 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:46,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:46,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:35:46,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:46,818 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 54 proven. 17 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2020-07-20 21:35:46,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:47,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:47,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:47,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:47,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:47,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:47,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:47,372 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 54 proven. 22 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 21:35:47,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152612682] [2020-07-20 21:35:47,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:47,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:35:47,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383839608] [2020-07-20 21:35:47,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:35:47,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:47,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:35:47,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:35:47,375 INFO L87 Difference]: Start difference. First operand 73 states and 142 transitions. Second operand 13 states. [2020-07-20 21:35:47,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:47,551 INFO L93 Difference]: Finished difference Result 100 states and 214 transitions. [2020-07-20 21:35:47,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:35:47,555 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 82 [2020-07-20 21:35:47,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:47,557 INFO L225 Difference]: With dead ends: 100 [2020-07-20 21:35:47,558 INFO L226 Difference]: Without dead ends: 96 [2020-07-20 21:35:47,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 143 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:35:47,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-07-20 21:35:47,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 77. [2020-07-20 21:35:47,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-20 21:35:47,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 151 transitions. [2020-07-20 21:35:47,588 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 151 transitions. Word has length 82 [2020-07-20 21:35:47,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:47,588 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 151 transitions. [2020-07-20 21:35:47,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:35:47,589 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 151 transitions. [2020-07-20 21:35:47,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 21:35:47,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:47,592 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:47,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:47,806 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:47,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:47,807 INFO L82 PathProgramCache]: Analyzing trace with hash -1751947273, now seen corresponding path program 3 times [2020-07-20 21:35:47,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:47,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894887340] [2020-07-20 21:35:47,808 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:47,862 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:47,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:47,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:35:47,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:47,935 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 38 proven. 7 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 21:35:47,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:48,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:48,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:48,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:48,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:48,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:48,248 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 38 proven. 9 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2020-07-20 21:35:48,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894887340] [2020-07-20 21:35:48,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:48,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:35:48,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991722200] [2020-07-20 21:35:48,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:35:48,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:48,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:35:48,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:35:48,251 INFO L87 Difference]: Start difference. First operand 77 states and 151 transitions. Second operand 11 states. [2020-07-20 21:35:48,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:48,409 INFO L93 Difference]: Finished difference Result 100 states and 219 transitions. [2020-07-20 21:35:48,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:35:48,410 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 69 [2020-07-20 21:35:48,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:48,412 INFO L225 Difference]: With dead ends: 100 [2020-07-20 21:35:48,412 INFO L226 Difference]: Without dead ends: 96 [2020-07-20 21:35:48,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 121 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:35:48,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-07-20 21:35:48,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 77. [2020-07-20 21:35:48,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-20 21:35:48,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 151 transitions. [2020-07-20 21:35:48,425 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 151 transitions. Word has length 69 [2020-07-20 21:35:48,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:48,426 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 151 transitions. [2020-07-20 21:35:48,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:35:48,426 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 151 transitions. [2020-07-20 21:35:48,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 21:35:48,428 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:48,428 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:48,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:48,642 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:48,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:48,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1082273126, now seen corresponding path program 3 times [2020-07-20 21:35:48,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:48,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269636683] [2020-07-20 21:35:48,643 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:48,711 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:48,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:48,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 21:35:48,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:48,784 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2020-07-20 21:35:48,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:49,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:49,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:49,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:49,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:49,215 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 43 proven. 16 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 21:35:49,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269636683] [2020-07-20 21:35:49,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:49,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 13 [2020-07-20 21:35:49,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617086717] [2020-07-20 21:35:49,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:35:49,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:49,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:35:49,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:35:49,218 INFO L87 Difference]: Start difference. First operand 77 states and 151 transitions. Second operand 13 states. [2020-07-20 21:35:49,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:49,442 INFO L93 Difference]: Finished difference Result 97 states and 206 transitions. [2020-07-20 21:35:49,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:35:49,442 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 80 [2020-07-20 21:35:49,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:49,444 INFO L225 Difference]: With dead ends: 97 [2020-07-20 21:35:49,444 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 21:35:49,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:35:49,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 21:35:49,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 64. [2020-07-20 21:35:49,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 21:35:49,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 112 transitions. [2020-07-20 21:35:49,454 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 112 transitions. Word has length 80 [2020-07-20 21:35:49,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:49,455 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 112 transitions. [2020-07-20 21:35:49,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:35:49,455 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 112 transitions. [2020-07-20 21:35:49,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 21:35:49,456 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:49,456 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:49,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:49,668 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:49,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:49,669 INFO L82 PathProgramCache]: Analyzing trace with hash -1711191765, now seen corresponding path program 1 times [2020-07-20 21:35:49,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:49,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98654765] [2020-07-20 21:35:49,670 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:49,721 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:49,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:49,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:35:49,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:49,766 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 32 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2020-07-20 21:35:49,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:50,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:50,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:50,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:50,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:50,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:50,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:50,292 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 19 proven. 35 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-07-20 21:35:50,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98654765] [2020-07-20 21:35:50,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:50,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:35:50,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122265558] [2020-07-20 21:35:50,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:35:50,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:50,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:35:50,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:35:50,294 INFO L87 Difference]: Start difference. First operand 64 states and 112 transitions. Second operand 13 states. [2020-07-20 21:35:50,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:50,496 INFO L93 Difference]: Finished difference Result 97 states and 209 transitions. [2020-07-20 21:35:50,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:35:50,496 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 69 [2020-07-20 21:35:50,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:50,498 INFO L225 Difference]: With dead ends: 97 [2020-07-20 21:35:50,498 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 21:35:50,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 119 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:35:50,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 21:35:50,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-07-20 21:35:50,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 21:35:50,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 92 transitions. [2020-07-20 21:35:50,507 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 92 transitions. Word has length 69 [2020-07-20 21:35:50,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:50,508 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 92 transitions. [2020-07-20 21:35:50,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:35:50,508 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 92 transitions. [2020-07-20 21:35:50,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 21:35:50,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:50,511 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:50,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:50,725 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:50,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:50,726 INFO L82 PathProgramCache]: Analyzing trace with hash 817110694, now seen corresponding path program 4 times [2020-07-20 21:35:50,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:50,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [471705852] [2020-07-20 21:35:50,727 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:50,790 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:50,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:50,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 21:35:50,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:50,869 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 31 proven. 27 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2020-07-20 21:35:50,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:51,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:51,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:51,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:51,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:51,320 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 21:35:51,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [471705852] [2020-07-20 21:35:51,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:51,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 13 [2020-07-20 21:35:51,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953365858] [2020-07-20 21:35:51,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:35:51,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:51,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:35:51,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:35:51,323 INFO L87 Difference]: Start difference. First operand 64 states and 92 transitions. Second operand 13 states. [2020-07-20 21:35:51,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:51,525 INFO L93 Difference]: Finished difference Result 86 states and 126 transitions. [2020-07-20 21:35:51,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:35:51,526 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 80 [2020-07-20 21:35:51,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:51,528 INFO L225 Difference]: With dead ends: 86 [2020-07-20 21:35:51,528 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 21:35:51,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:35:51,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 21:35:51,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-07-20 21:35:51,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 21:35:51,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 80 transitions. [2020-07-20 21:35:51,540 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 80 transitions. Word has length 80 [2020-07-20 21:35:51,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:51,541 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 80 transitions. [2020-07-20 21:35:51,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:35:51,541 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 80 transitions. [2020-07-20 21:35:51,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 21:35:51,544 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:51,544 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:51,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:51,760 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:51,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:51,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-20 21:35:51,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:51,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1058018426] [2020-07-20 21:35:51,762 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:51,855 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:51,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:51,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:35:51,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:51,938 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 41 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2020-07-20 21:35:51,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:52,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:52,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:52,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:52,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:52,647 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 26 proven. 46 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2020-07-20 21:35:52,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1058018426] [2020-07-20 21:35:52,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:52,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-20 21:35:52,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292922828] [2020-07-20 21:35:52,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:35:52,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:52,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:35:52,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:35:52,654 INFO L87 Difference]: Start difference. First operand 64 states and 80 transitions. Second operand 15 states. [2020-07-20 21:35:52,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:52,847 INFO L93 Difference]: Finished difference Result 89 states and 110 transitions. [2020-07-20 21:35:52,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:35:52,848 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 80 [2020-07-20 21:35:52,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:52,848 INFO L225 Difference]: With dead ends: 89 [2020-07-20 21:35:52,848 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 21:35:52,850 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 139 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:35:52,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 21:35:52,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 21:35:52,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 21:35:52,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 21:35:52,851 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 80 [2020-07-20 21:35:52,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:52,851 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 21:35:52,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:35:52,851 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 21:35:52,851 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 21:35:53,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:53,056 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 21:35:53,935 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 15 [2020-07-20 21:35:54,286 WARN L193 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 23 [2020-07-20 21:35:54,289 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 21:35:54,290 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:35:54,290 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:35:54,290 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 21:35:54,290 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 21:35:54,290 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 21:35:54,291 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-20 21:35:54,291 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-20 21:35:54,291 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-20 21:35:54,291 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-20 21:35:54,291 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-20 21:35:54,292 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-20 21:35:54,292 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= 4 main_~x~0) (<= main_~x~0 4)) [2020-07-20 21:35:54,292 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-20 21:35:54,292 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-20 21:35:54,292 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-20 21:35:54,292 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|)) [2020-07-20 21:35:54,292 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-20 21:35:54,293 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (or (and (= 1 |fibo2_#t~ret2|) (<= 2 |fibo2_#in~n|)) (<= 4 |fibo2_#in~n|)) (<= |fibo2_#in~n| fibo2_~n)) [2020-07-20 21:35:54,293 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-20 21:35:54,293 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-20 21:35:54,293 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-20 21:35:54,293 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-20 21:35:54,293 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-20 21:35:54,293 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-20 21:35:54,293 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= 2 |fibo1_#in~n|) (<= fibo1_~n |fibo1_#in~n|) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-20 21:35:54,294 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-20 21:35:54,294 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (and (let ((.cse0 (<= fibo1_~n |fibo1_#in~n|))) (or (and .cse0 (<= 3 |fibo1_#in~n|)) (and (<= 2 |fibo1_#in~n|) .cse0 (= 1 |fibo1_#t~ret0|)))) (let ((.cse1 (<= |fibo1_#in~n| fibo1_~n))) (or (and (= 2 |fibo1_#t~ret0|) .cse1) (and .cse1 (<= |fibo1_#in~n| 3)) (and (<= 5 |fibo1_#in~n|) .cse1)))) [2020-07-20 21:35:54,294 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-20 21:35:54,294 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-20 21:35:54,294 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-20 21:35:54,294 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-20 21:35:54,294 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-20 21:35:54,299 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:35:54 BoogieIcfgContainer [2020-07-20 21:35:54,300 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:35:54,301 INFO L168 Benchmark]: Toolchain (without parser) took 17175.33 ms. Allocated memory was 135.8 MB in the beginning and 374.3 MB in the end (delta: 238.6 MB). Free memory was 100.1 MB in the beginning and 94.2 MB in the end (delta: 5.9 MB). Peak memory consumption was 244.5 MB. Max. memory is 7.1 GB. [2020-07-20 21:35:54,302 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 135.8 MB. Free memory is still 118.5 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 21:35:54,302 INFO L168 Benchmark]: CACSL2BoogieTranslator took 239.75 ms. Allocated memory is still 135.8 MB. Free memory was 99.7 MB in the beginning and 90.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-20 21:35:54,303 INFO L168 Benchmark]: Boogie Preprocessor took 109.57 ms. Allocated memory was 135.8 MB in the beginning and 200.3 MB in the end (delta: 64.5 MB). Free memory was 90.4 MB in the beginning and 179.1 MB in the end (delta: -88.6 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. [2020-07-20 21:35:54,303 INFO L168 Benchmark]: RCFGBuilder took 279.03 ms. Allocated memory is still 200.3 MB. Free memory was 179.1 MB in the beginning and 165.7 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-07-20 21:35:54,304 INFO L168 Benchmark]: TraceAbstraction took 16539.92 ms. Allocated memory was 200.3 MB in the beginning and 374.3 MB in the end (delta: 174.1 MB). Free memory was 164.6 MB in the beginning and 94.2 MB in the end (delta: 70.5 MB). Peak memory consumption was 244.5 MB. Max. memory is 7.1 GB. [2020-07-20 21:35:54,311 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 135.8 MB. Free memory is still 118.5 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 239.75 ms. Allocated memory is still 135.8 MB. Free memory was 99.7 MB in the beginning and 90.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 109.57 ms. Allocated memory was 135.8 MB in the beginning and 200.3 MB in the end (delta: 64.5 MB). Free memory was 90.4 MB in the beginning and 179.1 MB in the end (delta: -88.6 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 279.03 ms. Allocated memory is still 200.3 MB. Free memory was 179.1 MB in the beginning and 165.7 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 16539.92 ms. Allocated memory was 200.3 MB in the beginning and 374.3 MB in the end (delta: 174.1 MB). Free memory was 164.6 MB in the beginning and 94.2 MB in the end (delta: 70.5 MB). Peak memory consumption was 244.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: 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 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.2s, OverallIterations: 17, TraceHistogramMax: 7, AutomataDifference: 2.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 1.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 470 SDtfs, 437 SDslu, 2582 SDs, 0 SdLazy, 2031 SolverSat, 248 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1849 GetRequests, 1544 SyntacticMatches, 97 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 2.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=77occurred 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: 0.2s AutomataMinimizationTime, 17 MinimizatonAttempts, 162 StatesRemovedByMinimization, 13 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 71 PreInvPairs, 292 NumberOfFragments, 92 HoareAnnotationTreeSize, 71 FomulaSimplifications, 103936 FormulaSimplificationTreeSizeReduction, 0.7s HoareSimplificationTime, 11 FomulaSimplificationsInter, 1276 FormulaSimplificationTreeSizeReductionInter, 0.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 7.3s InterpolantComputationTime, 915 NumberOfCodeBlocks, 704 NumberOfCodeBlocksAsserted, 49 NumberOfCheckSat, 1771 ConstructedInterpolants, 0 QuantifiedInterpolants, 232328 SizeOfPredicates, 61 NumberOfNonLiveVariables, 1757 ConjunctsInSsa, 164 ConjunctsInUnsatCore, 32 InterpolantComputations, 2 PerfectInterpolantSequences, 1524/2030 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...