/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 BIGGEST_EQUIVALENCE_CLASS --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_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:20:39,829 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:20:39,831 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:20:39,850 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:20:39,850 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:20:39,852 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:20:39,853 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:20:39,855 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:20:39,856 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:20:39,857 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:20:39,858 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:20:39,859 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:20:39,860 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:20:39,861 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:20:39,862 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:20:39,863 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:20:39,864 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:20:39,865 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:20:39,867 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:20:39,869 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:20:39,871 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:20:39,872 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:20:39,873 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:20:39,874 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:20:39,877 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 22:20:39,877 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 22:20:39,878 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 22:20:39,878 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 22:20:39,879 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 22:20:39,880 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 22:20:39,880 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 22:20:39,881 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 22:20:39,881 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 22:20:39,882 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 22:20:39,883 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 22:20:39,884 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 22:20:39,884 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 22:20:39,885 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 22:20:39,885 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:20:39,886 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:20:39,887 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:20:39,888 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 22:20:39,905 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:20:39,905 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:20:39,907 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:20:39,907 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:20:39,907 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:20:39,908 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:20:39,908 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:20:39,908 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:20:39,908 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:20:39,908 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:20:39,909 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:20:39,909 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:20:39,909 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:20:39,909 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:20:39,909 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:20:39,910 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:20:39,910 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:20:39,910 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:20:39,910 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:20:39,911 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:20:39,911 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:20:39,911 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:20:39,911 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:20:39,911 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:20:39,912 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:20:39,912 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:20:39,912 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:39,912 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:20:39,912 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:20:39,913 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 22:20:40,234 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:20:40,255 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:20:40,262 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:20:40,264 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:20:40,264 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:20:40,266 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-07-21 22:20:40,352 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a1702315d/35a1697b1b784564ac6e03bed8537941/FLAGd21cd0a37 [2020-07-21 22:20:40,934 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:20:40,935 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-07-21 22:20:40,942 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a1702315d/35a1697b1b784564ac6e03bed8537941/FLAGd21cd0a37 [2020-07-21 22:20:41,250 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a1702315d/35a1697b1b784564ac6e03bed8537941 [2020-07-21 22:20:41,260 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:20:41,263 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:20:41,264 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:20:41,265 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:20:41,268 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:20:41,269 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:20:41" (1/1) ... [2020-07-21 22:20:41,272 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d7e67ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:41, skipping insertion in model container [2020-07-21 22:20:41,273 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:20:41" (1/1) ... [2020-07-21 22:20:41,283 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:20:41,303 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:20:41,475 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:20:41,480 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:20:41,496 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:20:41,511 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:20:41,511 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:41 WrapperNode [2020-07-21 22:20:41,512 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:20:41,512 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:20:41,513 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:20:41,513 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:20:41,527 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:41" (1/1) ... [2020-07-21 22:20:41,527 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:41" (1/1) ... [2020-07-21 22:20:41,532 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:41" (1/1) ... [2020-07-21 22:20:41,533 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:41" (1/1) ... [2020-07-21 22:20:41,536 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:41" (1/1) ... [2020-07-21 22:20:41,539 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:41" (1/1) ... [2020-07-21 22:20:41,539 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:41" (1/1) ... [2020-07-21 22:20:41,541 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:20:41,541 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:20:41,541 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:20:41,541 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:20:41,542 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:41" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:20:41,691 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:20:41,692 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:20:41,692 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 22:20:41,692 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:20:41,692 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:20:41,692 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:20:41,692 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 22:20:41,693 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:20:41,693 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:20:41,693 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:20:41,893 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:20:41,894 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:20:41,898 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:20:41 BoogieIcfgContainer [2020-07-21 22:20:41,898 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:20:41,900 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:20:41,900 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:20:41,904 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:20:41,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:20:41" (1/3) ... [2020-07-21 22:20:41,905 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@361d9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:20:41, skipping insertion in model container [2020-07-21 22:20:41,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:41" (2/3) ... [2020-07-21 22:20:41,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@361d9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:20:41, skipping insertion in model container [2020-07-21 22:20:41,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:20:41" (3/3) ... [2020-07-21 22:20:41,910 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-2.c [2020-07-21 22:20:41,924 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:20:41,934 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:20:41,956 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:20:42,015 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:20:42,015 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:20:42,015 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:20:42,016 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:20:42,016 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:20:42,016 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:20:42,017 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:20:42,017 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:20:42,045 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 22:20:42,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:20:42,053 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:42,054 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:42,055 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:42,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:42,069 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 22:20:42,083 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:42,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702165453] [2020-07-21 22:20:42,085 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 [2020-07-21 22:20:42,151 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:42,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:42,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:20:42,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:42,265 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:20:42,265 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:20:42,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702165453] [2020-07-21 22:20:42,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:20:42,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:20:42,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117242009] [2020-07-21 22:20:42,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:20:42,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:42,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:20:42,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:20:42,296 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 22:20:42,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:42,420 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 22:20:42,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:20:42,423 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:20:42,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:42,435 INFO L225 Difference]: With dead ends: 35 [2020-07-21 22:20:42,435 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 22:20:42,440 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 [2020-07-21 22:20:42,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 22:20:42,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 22:20:42,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:20:42,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:20:42,496 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 22:20:42,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:42,497 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:20:42,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:20:42,498 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:20:42,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:20:42,500 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:42,500 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:42,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:42,717 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:42,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:42,718 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 22:20:42,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:42,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1353087702] [2020-07-21 22:20:42,720 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 [2020-07-21 22:20:42,754 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:20:42,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:42,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:20:42,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:42,790 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:20:42,790 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:20:42,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1353087702] [2020-07-21 22:20:42,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:20:42,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:20:42,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455728183] [2020-07-21 22:20:42,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:20:42,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:42,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:20:42,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:20:42,795 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 22:20:42,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:42,867 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 22:20:42,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:20:42,868 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 22:20:42,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:42,870 INFO L225 Difference]: With dead ends: 27 [2020-07-21 22:20:42,870 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 22:20:42,872 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 [2020-07-21 22:20:42,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 22:20:42,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 22:20:42,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:20:42,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:20:42,880 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 22:20:42,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:42,881 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:20:42,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:20:42,881 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:20:42,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:20:42,883 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:42,883 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:43,098 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:43,101 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:43,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:43,102 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 22:20:43,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:43,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1104718942] [2020-07-21 22:20:43,104 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 [2020-07-21 22:20:43,140 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:43,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:43,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:20:43,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:43,221 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:20:43,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:43,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:43,582 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:20:43,584 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1104718942] [2020-07-21 22:20:43,584 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:43,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:20:43,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531499066] [2020-07-21 22:20:43,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:20:43,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:43,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:20:43,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:20:43,597 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 22:20:43,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:43,764 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 22:20:43,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:20:43,764 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 22:20:43,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:43,766 INFO L225 Difference]: With dead ends: 32 [2020-07-21 22:20:43,767 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 22:20:43,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:20:43,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 22:20:43,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 22:20:43,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:20:43,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:20:43,781 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 22:20:43,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:43,781 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:20:43,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:20:43,782 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:20:43,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:20:43,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:43,784 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:43,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:43,998 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:43,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:43,999 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 22:20:43,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:43,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [635356185] [2020-07-21 22:20:44,000 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 [2020-07-21 22:20:44,034 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:44,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:44,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:20:44,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:44,099 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 22:20:44,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:44,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:44,349 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:20:44,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [635356185] [2020-07-21 22:20:44,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:44,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:20:44,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861036195] [2020-07-21 22:20:44,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:20:44,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:44,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:20:44,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:20:44,356 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 22:20:44,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:44,492 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 22:20:44,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:20:44,495 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 22:20:44,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:44,497 INFO L225 Difference]: With dead ends: 37 [2020-07-21 22:20:44,499 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 22:20:44,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:20:44,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 22:20:44,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 22:20:44,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:20:44,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:20:44,528 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 22:20:44,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:44,528 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:20:44,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:20:44,528 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:20:44,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 22:20:44,535 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:44,535 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:44,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:44,749 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:44,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:44,750 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 22:20:44,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:44,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42500135] [2020-07-21 22:20:44,751 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 [2020-07-21 22:20:44,787 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:44,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:44,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:20:44,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:44,843 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 22:20:44,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:45,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:45,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:45,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:45,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:45,223 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 22:20:45,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42500135] [2020-07-21 22:20:45,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:45,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:20:45,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609383422] [2020-07-21 22:20:45,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:20:45,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:45,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:20:45,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:20:45,227 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 22:20:45,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:45,404 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 22:20:45,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:20:45,405 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 22:20:45,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:45,408 INFO L225 Difference]: With dead ends: 42 [2020-07-21 22:20:45,408 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 22:20:45,409 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:45,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 22:20:45,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 22:20:45,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:20:45,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:20:45,438 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 22:20:45,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:45,438 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:20:45,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:20:45,439 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:20:45,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 22:20:45,445 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:45,445 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:45,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:45,654 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:45,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:45,655 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 22:20:45,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:45,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1491078835] [2020-07-21 22:20:45,657 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:45,696 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:45,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:45,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:20:45,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:45,775 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 22:20:45,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:46,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:46,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:46,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:46,147 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 22:20:46,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1491078835] [2020-07-21 22:20:46,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:46,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:20:46,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345498543] [2020-07-21 22:20:46,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:20:46,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:46,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:20:46,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:20:46,150 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 22:20:46,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:46,317 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 22:20:46,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:20:46,318 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 22:20:46,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:46,325 INFO L225 Difference]: With dead ends: 47 [2020-07-21 22:20:46,325 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 22:20:46,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:46,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 22:20:46,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 22:20:46,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:20:46,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:20:46,355 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 22:20:46,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:46,356 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:20:46,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:20:46,356 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:20:46,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 22:20:46,364 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:46,364 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:46,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:46,583 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:46,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:46,584 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 22:20:46,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:46,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [533038556] [2020-07-21 22:20:46,585 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:46,624 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:46,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:46,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:20:46,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:46,693 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 22:20:46,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:47,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:47,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:47,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:47,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:47,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:47,388 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 22:20:47,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [533038556] [2020-07-21 22:20:47,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:47,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:20:47,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911832873] [2020-07-21 22:20:47,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:20:47,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:47,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:20:47,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:20:47,395 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 22:20:47,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:47,611 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 22:20:47,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:20:47,612 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 22:20:47,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:47,621 INFO L225 Difference]: With dead ends: 52 [2020-07-21 22:20:47,621 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 22:20:47,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:20:47,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 22:20:47,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 22:20:47,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:20:47,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:20:47,657 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 22:20:47,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:47,658 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:20:47,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:20:47,659 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:20:47,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 22:20:47,668 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:47,668 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:47,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:47,885 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:47,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:47,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 22:20:47,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:47,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424488520] [2020-07-21 22:20:47,886 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 [2020-07-21 22:20:47,936 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:20:47,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:47,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:20:47,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:48,037 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 22:20:48,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:48,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:48,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:48,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:48,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:48,703 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 22:20:48,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424488520] [2020-07-21 22:20:48,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:48,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 12 [2020-07-21 22:20:48,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216407927] [2020-07-21 22:20:48,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:20:48,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:48,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:20:48,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:20:48,712 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 12 states. [2020-07-21 22:20:48,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:48,876 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 22:20:48,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:20:48,880 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 96 [2020-07-21 22:20:48,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:48,883 INFO L225 Difference]: With dead ends: 57 [2020-07-21 22:20:48,883 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 22:20:48,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-21 22:20:48,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 22:20:48,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 22:20:48,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:20:48,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:20:48,917 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 22:20:48,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:48,918 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:20:48,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:20:48,918 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:20:48,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 22:20:48,921 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:48,921 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:49,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:49,137 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:49,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:49,138 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 22:20:49,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:49,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1205190615] [2020-07-21 22:20:49,140 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 [2020-07-21 22:20:49,186 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:20:49,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:49,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:20:49,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:49,290 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 22:20:49,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:49,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:49,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:50,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:50,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:50,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:50,347 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 22:20:50,347 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1205190615] [2020-07-21 22:20:50,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:50,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 22:20:50,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490850092] [2020-07-21 22:20:50,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:20:50,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:50,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:20:50,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:50,350 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 14 states. [2020-07-21 22:20:50,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:50,599 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 22:20:50,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:20:50,600 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 117 [2020-07-21 22:20:50,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:50,602 INFO L225 Difference]: With dead ends: 62 [2020-07-21 22:20:50,602 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 22:20:50,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:20:50,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 22:20:50,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 22:20:50,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:20:50,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 22:20:50,617 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 22:20:50,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:50,618 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 22:20:50,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:20:50,618 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 22:20:50,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 22:20:50,621 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:50,621 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:50,834 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:50,836 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:50,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:50,836 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 22:20:50,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:50,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [797961402] [2020-07-21 22:20:50,838 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 [2020-07-21 22:20:50,913 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:50,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:50,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:20:50,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:51,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 221 proven. 407 refuted. 0 times theorem prover too weak. 1298 trivial. 0 not checked. [2020-07-21 22:20:51,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:51,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:51,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:51,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:52,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:52,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:52,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:52,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:52,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:52,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 223 proven. 427 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2020-07-21 22:20:52,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [797961402] [2020-07-21 22:20:52,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:52,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 22:20:52,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566645410] [2020-07-21 22:20:52,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:20:52,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:52,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:20:52,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:52,265 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 14 states. [2020-07-21 22:20:52,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:52,504 INFO L93 Difference]: Finished difference Result 88 states and 260 transitions. [2020-07-21 22:20:52,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:20:52,505 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 190 [2020-07-21 22:20:52,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:52,507 INFO L225 Difference]: With dead ends: 88 [2020-07-21 22:20:52,507 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 22:20:52,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:20:52,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 22:20:52,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-07-21 22:20:52,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 22:20:52,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 70 transitions. [2020-07-21 22:20:52,544 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 70 transitions. Word has length 190 [2020-07-21 22:20:52,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:52,547 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 70 transitions. [2020-07-21 22:20:52,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:20:52,548 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 70 transitions. [2020-07-21 22:20:52,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 22:20:52,552 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:52,554 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:52,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:52,767 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:52,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:52,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1040445716, now seen corresponding path program 5 times [2020-07-21 22:20:52,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:52,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612147212] [2020-07-21 22:20:52,769 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 [2020-07-21 22:20:52,849 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:20:52,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:52,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:20:52,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:52,920 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 108 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2020-07-21 22:20:52,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:53,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:53,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:53,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:53,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:53,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:53,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:53,985 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 130 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-07-21 22:20:53,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612147212] [2020-07-21 22:20:53,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:53,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 22:20:53,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111076628] [2020-07-21 22:20:53,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:20:53,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:53,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:20:53,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:53,987 INFO L87 Difference]: Start difference. First operand 49 states and 70 transitions. Second operand 14 states. [2020-07-21 22:20:54,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:54,192 INFO L93 Difference]: Finished difference Result 67 states and 91 transitions. [2020-07-21 22:20:54,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:20:54,193 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 136 [2020-07-21 22:20:54,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:54,194 INFO L225 Difference]: With dead ends: 67 [2020-07-21 22:20:54,195 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 22:20:54,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 248 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:20:54,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 22:20:54,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2020-07-21 22:20:54,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 22:20:54,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 77 transitions. [2020-07-21 22:20:54,221 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 77 transitions. Word has length 136 [2020-07-21 22:20:54,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:54,227 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 77 transitions. [2020-07-21 22:20:54,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:20:54,227 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 77 transitions. [2020-07-21 22:20:54,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 22:20:54,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:54,234 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:54,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:54,449 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:54,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:54,449 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 6 times [2020-07-21 22:20:54,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:54,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1441392373] [2020-07-21 22:20:54,450 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 [2020-07-21 22:20:54,535 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:20:54,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 22:20:54,536 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:20:54,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 22:20:54,561 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:20:54,593 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 22:20:54,593 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 22:20:54,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:54,856 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:20:54 BoogieIcfgContainer [2020-07-21 22:20:54,857 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:20:54,860 INFO L168 Benchmark]: Toolchain (without parser) took 13597.11 ms. Allocated memory was 135.8 MB in the beginning and 359.1 MB in the end (delta: 223.3 MB). Free memory was 101.2 MB in the beginning and 171.5 MB in the end (delta: -70.4 MB). Peak memory consumption was 153.0 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:54,861 INFO L168 Benchmark]: CDTParser took 0.53 ms. Allocated memory is still 135.8 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 22:20:54,862 INFO L168 Benchmark]: CACSL2BoogieTranslator took 247.59 ms. Allocated memory is still 135.8 MB. Free memory was 100.7 MB in the beginning and 91.5 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:54,863 INFO L168 Benchmark]: Boogie Preprocessor took 28.42 ms. Allocated memory is still 135.8 MB. Free memory was 91.5 MB in the beginning and 90.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:54,864 INFO L168 Benchmark]: RCFGBuilder took 357.14 ms. Allocated memory was 135.8 MB in the beginning and 199.2 MB in the end (delta: 63.4 MB). Free memory was 90.0 MB in the beginning and 167.7 MB in the end (delta: -77.7 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:54,865 INFO L168 Benchmark]: TraceAbstraction took 12956.64 ms. Allocated memory was 199.2 MB in the beginning and 359.1 MB in the end (delta: 159.9 MB). Free memory was 167.0 MB in the beginning and 171.5 MB in the end (delta: -4.6 MB). Peak memory consumption was 155.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:54,869 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.53 ms. Allocated memory is still 135.8 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 247.59 ms. Allocated memory is still 135.8 MB. Free memory was 100.7 MB in the beginning and 91.5 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 28.42 ms. Allocated memory is still 135.8 MB. Free memory was 91.5 MB in the beginning and 90.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 357.14 ms. Allocated memory was 135.8 MB in the beginning and 199.2 MB in the end (delta: 63.4 MB). Free memory was 90.0 MB in the beginning and 167.7 MB in the end (delta: -77.7 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 12956.64 ms. Allocated memory was 199.2 MB in the beginning and 359.1 MB in the end (delta: 159.9 MB). Free memory was 167.0 MB in the beginning and 171.5 MB in the end (delta: -4.6 MB). Peak memory consumption was 155.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 27]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L24] int x = 5; VAL [x=5] [L25] CALL, EXPR fibo(x) VAL [\old(n)=5] [L6] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L8] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L11] return fibo(n-1) + fibo(n-2); [L25] RET, EXPR fibo(x) VAL [fibo(x)=5, x=5] [L25] int result = fibo(x); [L26] COND TRUE result == 5 VAL [result=5, x=5] [L27] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 12.7s, OverallIterations: 12, TraceHistogramMax: 27, AutomataDifference: 2.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 194 SDtfs, 338 SDslu, 656 SDs, 0 SdLazy, 717 SolverSat, 365 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1534 GetRequests, 1334 SyntacticMatches, 70 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 1.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=54occurred in iteration=11, 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, 11 MinimizatonAttempts, 82 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 6.9s InterpolantComputationTime, 873 NumberOfCodeBlocks, 485 NumberOfCodeBlocksAsserted, 26 NumberOfCheckSat, 1481 ConstructedInterpolants, 0 QuantifiedInterpolants, 300571 SizeOfPredicates, 46 NumberOfNonLiveVariables, 849 ConjunctsInSsa, 92 ConjunctsInUnsatCore, 20 InterpolantComputations, 2 PerfectInterpolantSequences, 6300/8528 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 incorrect! Received shutdown request...