/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 20:18:01,797 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 20:18:01,799 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 20:18:01,812 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 20:18:01,812 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 20:18:01,813 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 20:18:01,815 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 20:18:01,816 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 20:18:01,818 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 20:18:01,819 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 20:18:01,820 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 20:18:01,821 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 20:18:01,821 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 20:18:01,822 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 20:18:01,824 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 20:18:01,825 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 20:18:01,826 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 20:18:01,827 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 20:18:01,829 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 20:18:01,831 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 20:18:01,833 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 20:18:01,834 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 20:18:01,835 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 20:18:01,836 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 20:18:01,839 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 20:18:01,839 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 20:18:01,839 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 20:18:01,840 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 20:18:01,841 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 20:18:01,842 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 20:18:01,842 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 20:18:01,843 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 20:18:01,844 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 20:18:01,844 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 20:18:01,845 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 20:18:01,846 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 20:18:01,846 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 20:18:01,847 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 20:18:01,847 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 20:18:01,848 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 20:18:01,849 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 20:18:01,849 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 20:18:01,864 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 20:18:01,865 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 20:18:01,866 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 20:18:01,866 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 20:18:01,866 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 20:18:01,867 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 20:18:01,867 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 20:18:01,867 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 20:18:01,867 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 20:18:01,867 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 20:18:01,868 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 20:18:01,868 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 20:18:01,868 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 20:18:01,868 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 20:18:01,868 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 20:18:01,868 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 20:18:01,869 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 20:18:01,869 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 20:18:01,869 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 20:18:01,869 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 20:18:01,870 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 20:18:01,870 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:18:01,870 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 20:18:01,870 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 20:18:01,870 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 20:18:01,871 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 20:18:01,871 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:01,871 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 20:18:01,871 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 20:18:01,871 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 20:18:02,166 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 20:18:02,179 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 20:18:02,183 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 20:18:02,184 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 20:18:02,185 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 20:18:02,186 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-21 20:18:02,264 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e592f1f96/b1e3ee669ab447659e710deaba354ee6/FLAG95660d02b [2020-07-21 20:18:02,747 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 20:18:02,748 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-21 20:18:02,755 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e592f1f96/b1e3ee669ab447659e710deaba354ee6/FLAG95660d02b [2020-07-21 20:18:03,143 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e592f1f96/b1e3ee669ab447659e710deaba354ee6 [2020-07-21 20:18:03,151 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 20:18:03,154 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 20:18:03,155 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 20:18:03,155 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 20:18:03,158 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 20:18:03,159 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:18:03" (1/1) ... [2020-07-21 20:18:03,162 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c5368fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:18:03, skipping insertion in model container [2020-07-21 20:18:03,162 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:18:03" (1/1) ... [2020-07-21 20:18:03,170 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 20:18:03,186 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 20:18:03,351 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:18:03,358 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 20:18:03,377 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:18:03,393 INFO L208 MainTranslator]: Completed translation [2020-07-21 20:18:03,394 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:18:03 WrapperNode [2020-07-21 20:18:03,394 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 20:18:03,395 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 20:18:03,395 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 20:18:03,395 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 20:18:03,498 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:18:03" (1/1) ... [2020-07-21 20:18:03,500 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:18:03" (1/1) ... [2020-07-21 20:18:03,517 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:18:03" (1/1) ... [2020-07-21 20:18:03,517 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:18:03" (1/1) ... [2020-07-21 20:18:03,525 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:18:03" (1/1) ... [2020-07-21 20:18:03,531 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:18:03" (1/1) ... [2020-07-21 20:18:03,532 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:18:03" (1/1) ... [2020-07-21 20:18:03,535 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 20:18:03,535 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 20:18:03,536 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 20:18:03,536 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 20:18:03,537 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:18:03" (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 20:18:03,617 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 20:18:03,617 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 20:18:03,617 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 20:18:03,617 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-07-21 20:18:03,617 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 20:18:03,618 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 20:18:03,618 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 20:18:03,618 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-21 20:18:03,619 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-07-21 20:18:03,619 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 20:18:03,619 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-21 20:18:03,620 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-21 20:18:03,620 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 20:18:03,620 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 20:18:03,620 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-21 20:18:03,621 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 20:18:03,621 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 20:18:03,621 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 20:18:03,870 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 20:18:03,871 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 20:18:03,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:18:03 BoogieIcfgContainer [2020-07-21 20:18:03,875 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 20:18:03,876 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 20:18:03,876 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 20:18:03,880 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 20:18:03,880 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 08:18:03" (1/3) ... [2020-07-21 20:18:03,881 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@359ec110 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:18:03, skipping insertion in model container [2020-07-21 20:18:03,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:18:03" (2/3) ... [2020-07-21 20:18:03,882 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@359ec110 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:18:03, skipping insertion in model container [2020-07-21 20:18:03,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:18:03" (3/3) ... [2020-07-21 20:18:03,887 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-07-21 20:18:03,917 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 20:18:03,938 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 20:18:03,972 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 20:18:04,006 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 20:18:04,006 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 20:18:04,006 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 20:18:04,006 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 20:18:04,007 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 20:18:04,007 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 20:18:04,007 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 20:18:04,007 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 20:18:04,024 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 20:18:04,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 20:18:04,030 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:18:04,031 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:18:04,032 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:18:04,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:18:04,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-07-21 20:18:04,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:18:04,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118817085] [2020-07-21 20:18:04,048 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:04,145 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:18:04,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:18:04,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 20:18:04,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:18:04,228 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 20:18:04,228 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:18:04,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118817085] [2020-07-21 20:18:04,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:18:04,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 20:18:04,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970327922] [2020-07-21 20:18:04,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 20:18:04,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:18:04,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 20:18:04,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 20:18:04,253 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-07-21 20:18:04,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:18:04,324 INFO L93 Difference]: Finished difference Result 60 states and 77 transitions. [2020-07-21 20:18:04,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 20:18:04,326 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-07-21 20:18:04,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:18:04,336 INFO L225 Difference]: With dead ends: 60 [2020-07-21 20:18:04,336 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 20:18:04,340 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 20:18:04,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 20:18:04,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-07-21 20:18:04,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 20:18:04,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-21 20:18:04,383 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-07-21 20:18:04,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:18:04,383 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-21 20:18:04,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 20:18:04,384 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-21 20:18:04,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 20:18:04,385 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:18:04,385 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:18:04,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:04,599 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:18:04,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:18:04,601 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-07-21 20:18:04,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:18:04,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667775916] [2020-07-21 20:18:04,603 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:04,675 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:18:04,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:18:04,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 20:18:04,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:18:04,709 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 20:18:04,710 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:18:04,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667775916] [2020-07-21 20:18:04,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:18:04,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 20:18:04,712 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176740558] [2020-07-21 20:18:04,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 20:18:04,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:18:04,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 20:18:04,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 20:18:04,718 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 3 states. [2020-07-21 20:18:04,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:18:04,761 INFO L93 Difference]: Finished difference Result 49 states and 58 transitions. [2020-07-21 20:18:04,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 20:18:04,762 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 20:18:04,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:18:04,766 INFO L225 Difference]: With dead ends: 49 [2020-07-21 20:18:04,766 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 20:18:04,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 20:18:04,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 20:18:04,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2020-07-21 20:18:04,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 20:18:04,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 20:18:04,792 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 22 [2020-07-21 20:18:04,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:18:04,793 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 20:18:04,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 20:18:04,793 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 20:18:04,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 20:18:04,797 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:18:04,797 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:18:05,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:05,002 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:18:05,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:18:05,003 INFO L82 PathProgramCache]: Analyzing trace with hash 413319423, now seen corresponding path program 1 times [2020-07-21 20:18:05,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:18:05,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098623838] [2020-07-21 20:18:05,005 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:05,055 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:18:05,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:18:05,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 20:18:05,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:18:05,072 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 20:18:05,072 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:18:05,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098623838] [2020-07-21 20:18:05,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:18:05,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 20:18:05,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32233683] [2020-07-21 20:18:05,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 20:18:05,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:18:05,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 20:18:05,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 20:18:05,075 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 3 states. [2020-07-21 20:18:05,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:18:05,100 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-07-21 20:18:05,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 20:18:05,101 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 20:18:05,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:18:05,103 INFO L225 Difference]: With dead ends: 48 [2020-07-21 20:18:05,103 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 20:18:05,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 20:18:05,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 20:18:05,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 20:18:05,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 20:18:05,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-21 20:18:05,110 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25 [2020-07-21 20:18:05,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:18:05,111 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-21 20:18:05,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 20:18:05,111 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-21 20:18:05,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 20:18:05,112 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:18:05,112 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:18:05,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:05,326 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:18:05,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:18:05,327 INFO L82 PathProgramCache]: Analyzing trace with hash 20292413, now seen corresponding path program 1 times [2020-07-21 20:18:05,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:18:05,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1803868600] [2020-07-21 20:18:05,329 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:05,378 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:18:05,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:18:05,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 20:18:05,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:18:05,435 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 20:18:05,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:18:05,553 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 20:18:05,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1803868600] [2020-07-21 20:18:05,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:18:05,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-21 20:18:05,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556648173] [2020-07-21 20:18:05,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 20:18:05,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:18:05,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 20:18:05,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-21 20:18:05,561 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-21 20:18:05,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:18:05,629 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2020-07-21 20:18:05,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 20:18:05,630 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-07-21 20:18:05,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:18:05,631 INFO L225 Difference]: With dead ends: 57 [2020-07-21 20:18:05,631 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 20:18:05,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2020-07-21 20:18:05,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 20:18:05,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 20:18:05,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 20:18:05,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2020-07-21 20:18:05,639 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 25 [2020-07-21 20:18:05,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:18:05,639 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2020-07-21 20:18:05,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 20:18:05,639 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2020-07-21 20:18:05,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 20:18:05,641 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:18:05,641 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:18:05,856 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:05,858 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:18:05,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:18:05,859 INFO L82 PathProgramCache]: Analyzing trace with hash 237942135, now seen corresponding path program 2 times [2020-07-21 20:18:05,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:18:05,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [891273047] [2020-07-21 20:18:05,860 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:05,943 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:18:05,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:18:05,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 20:18:05,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:18:05,961 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:18:05,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:18:05,990 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:18:05,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [891273047] [2020-07-21 20:18:05,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:18:05,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 20:18:05,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692970846] [2020-07-21 20:18:05,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 20:18:05,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:18:05,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 20:18:05,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:18:05,992 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 6 states. [2020-07-21 20:18:06,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:18:06,064 INFO L93 Difference]: Finished difference Result 73 states and 86 transitions. [2020-07-21 20:18:06,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 20:18:06,065 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2020-07-21 20:18:06,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:18:06,066 INFO L225 Difference]: With dead ends: 73 [2020-07-21 20:18:06,066 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 20:18:06,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:18:06,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 20:18:06,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 45. [2020-07-21 20:18:06,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 20:18:06,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2020-07-21 20:18:06,075 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 31 [2020-07-21 20:18:06,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:18:06,076 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2020-07-21 20:18:06,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 20:18:06,076 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2020-07-21 20:18:06,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 20:18:06,077 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:18:06,078 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:18:06,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:06,293 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:18:06,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:18:06,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1883312142, now seen corresponding path program 3 times [2020-07-21 20:18:06,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:18:06,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1746407148] [2020-07-21 20:18:06,296 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:06,385 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:18:06,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:18:06,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 20:18:06,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:18:06,438 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:18:06,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:18:06,510 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:18:06,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1746407148] [2020-07-21 20:18:06,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:18:06,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 20:18:06,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140351588] [2020-07-21 20:18:06,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 20:18:06,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:18:06,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 20:18:06,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:18:06,513 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 12 states. [2020-07-21 20:18:06,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:18:06,675 INFO L93 Difference]: Finished difference Result 121 states and 149 transitions. [2020-07-21 20:18:06,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 20:18:06,676 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 20:18:06,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:18:06,678 INFO L225 Difference]: With dead ends: 121 [2020-07-21 20:18:06,678 INFO L226 Difference]: Without dead ends: 109 [2020-07-21 20:18:06,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:18:06,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-07-21 20:18:06,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 63. [2020-07-21 20:18:06,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-07-21 20:18:06,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-07-21 20:18:06,691 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 40 [2020-07-21 20:18:06,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:18:06,691 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-07-21 20:18:06,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 20:18:06,692 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-07-21 20:18:06,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-21 20:18:06,693 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:18:06,694 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:18:06,908 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:06,909 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:18:06,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:18:06,909 INFO L82 PathProgramCache]: Analyzing trace with hash 586494510, now seen corresponding path program 4 times [2020-07-21 20:18:06,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:18:06,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [495572326] [2020-07-21 20:18:06,910 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:07,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:18:07,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:18:07,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 20:18:07,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:18:07,186 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:18:07,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:18:07,422 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:18:07,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [495572326] [2020-07-21 20:18:07,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:18:07,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 20:18:07,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672651847] [2020-07-21 20:18:07,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 20:18:07,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:18:07,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 20:18:07,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 20:18:07,425 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 24 states. [2020-07-21 20:18:07,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:18:07,729 INFO L93 Difference]: Finished difference Result 217 states and 275 transitions. [2020-07-21 20:18:07,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 20:18:07,730 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 58 [2020-07-21 20:18:07,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:18:07,732 INFO L225 Difference]: With dead ends: 217 [2020-07-21 20:18:07,732 INFO L226 Difference]: Without dead ends: 205 [2020-07-21 20:18:07,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 20:18:07,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-07-21 20:18:07,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 99. [2020-07-21 20:18:07,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-21 20:18:07,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-07-21 20:18:07,751 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 58 [2020-07-21 20:18:07,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:18:07,751 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-07-21 20:18:07,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 20:18:07,752 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-07-21 20:18:07,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-21 20:18:07,753 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:18:07,753 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:18:07,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:07,967 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:18:07,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:18:07,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1900634514, now seen corresponding path program 5 times [2020-07-21 20:18:07,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:18:07,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1338089522] [2020-07-21 20:18:07,970 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:08,421 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:18:08,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:18:08,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 20:18:08,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:18:08,824 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:18:08,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:18:09,752 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:18:09,752 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1338089522] [2020-07-21 20:18:09,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:18:09,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 20:18:09,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325151430] [2020-07-21 20:18:09,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 20:18:09,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:18:09,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 20:18:09,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 20:18:09,756 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 48 states. [2020-07-21 20:18:10,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:18:10,655 INFO L93 Difference]: Finished difference Result 409 states and 527 transitions. [2020-07-21 20:18:10,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 20:18:10,655 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 94 [2020-07-21 20:18:10,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:18:10,661 INFO L225 Difference]: With dead ends: 409 [2020-07-21 20:18:10,662 INFO L226 Difference]: Without dead ends: 397 [2020-07-21 20:18:10,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 20:18:10,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2020-07-21 20:18:10,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 171. [2020-07-21 20:18:10,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2020-07-21 20:18:10,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 174 transitions. [2020-07-21 20:18:10,726 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 174 transitions. Word has length 94 [2020-07-21 20:18:10,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:18:10,726 INFO L479 AbstractCegarLoop]: Abstraction has 171 states and 174 transitions. [2020-07-21 20:18:10,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 20:18:10,727 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 174 transitions. [2020-07-21 20:18:10,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2020-07-21 20:18:10,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:18:10,729 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:18:10,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:10,949 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:18:10,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:18:10,950 INFO L82 PathProgramCache]: Analyzing trace with hash 5641966, now seen corresponding path program 6 times [2020-07-21 20:18:10,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:18:10,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1505131611] [2020-07-21 20:18:10,951 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:11,586 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:18:11,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:18:11,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 20:18:11,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:18:12,875 INFO L134 CoverageAnalysis]: Checked inductivity of 3167 backedges. 0 proven. 3151 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:18:12,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:18:16,578 INFO L134 CoverageAnalysis]: Checked inductivity of 3167 backedges. 0 proven. 3151 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 20:18:16,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1505131611] [2020-07-21 20:18:16,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:18:16,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-21 20:18:16,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815703793] [2020-07-21 20:18:16,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-21 20:18:16,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:18:16,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-21 20:18:16,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 20:18:16,585 INFO L87 Difference]: Start difference. First operand 171 states and 174 transitions. Second operand 96 states. [2020-07-21 20:18:19,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:18:19,687 INFO L93 Difference]: Finished difference Result 793 states and 1031 transitions. [2020-07-21 20:18:19,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 20:18:19,688 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 166 [2020-07-21 20:18:19,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:18:19,693 INFO L225 Difference]: With dead ends: 793 [2020-07-21 20:18:19,693 INFO L226 Difference]: Without dead ends: 781 [2020-07-21 20:18:19,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 20:18:19,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781 states. [2020-07-21 20:18:19,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781 to 315. [2020-07-21 20:18:19,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 315 states. [2020-07-21 20:18:19,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 318 transitions. [2020-07-21 20:18:19,730 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 318 transitions. Word has length 166 [2020-07-21 20:18:19,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:18:19,730 INFO L479 AbstractCegarLoop]: Abstraction has 315 states and 318 transitions. [2020-07-21 20:18:19,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-21 20:18:19,731 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 318 transitions. [2020-07-21 20:18:19,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-21 20:18:19,735 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:18:19,735 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 94, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:18:19,950 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:18:19,951 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:18:19,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:18:19,952 INFO L82 PathProgramCache]: Analyzing trace with hash -842561554, now seen corresponding path program 7 times [2020-07-21 20:18:19,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:18:19,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [401936769] [2020-07-21 20:18:19,953 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in