/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 21:23:18,036 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 21:23:18,039 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 21:23:18,079 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 21:23:18,080 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 21:23:18,092 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 21:23:18,095 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 21:23:18,096 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 21:23:18,100 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 21:23:18,103 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 21:23:18,104 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 21:23:18,106 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 21:23:18,107 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 21:23:18,111 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 21:23:18,112 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 21:23:18,114 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 21:23:18,115 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 21:23:18,118 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 21:23:18,120 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 21:23:18,125 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 21:23:18,127 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 21:23:18,127 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 21:23:18,129 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 21:23:18,129 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 21:23:18,131 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 21:23:18,132 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 21:23:18,132 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 21:23:18,133 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 21:23:18,133 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 21:23:18,134 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 21:23:18,134 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 21:23:18,135 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 21:23:18,135 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 21:23:18,136 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 21:23:18,137 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 21:23:18,137 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 21:23:18,138 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 21:23:18,138 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 21:23:18,138 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 21:23:18,139 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 21:23:18,140 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 21:23:18,141 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 21:23:18,162 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 21:23:18,162 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 21:23:18,164 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 21:23:18,164 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 21:23:18,164 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 21:23:18,164 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 21:23:18,165 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 21:23:18,165 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 21:23:18,165 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 21:23:18,165 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 21:23:18,165 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 21:23:18,166 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 21:23:18,166 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 21:23:18,166 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 21:23:18,166 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 21:23:18,166 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 21:23:18,167 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 21:23:18,167 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 21:23:18,167 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 21:23:18,167 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 21:23:18,167 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 21:23:18,168 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:23:18,168 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 21:23:18,168 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 21:23:18,168 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 21:23:18,168 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 21:23:18,169 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 21:23:18,169 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 21:23:18,169 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 21:23:18,169 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; [2020-08-21 21:23:18,469 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 21:23:18,481 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 21:23:18,484 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 21:23:18,486 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 21:23:18,487 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 21:23:18,487 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-21 21:23:18,560 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8d03294e9/45680a60b2684ae7a783e4804f5b3256/FLAGa1182a9e3 [2020-08-21 21:23:18,971 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 21:23:18,972 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-08-21 21:23:18,979 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8d03294e9/45680a60b2684ae7a783e4804f5b3256/FLAGa1182a9e3 [2020-08-21 21:23:19,362 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8d03294e9/45680a60b2684ae7a783e4804f5b3256 [2020-08-21 21:23:19,372 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 21:23:19,374 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 21:23:19,379 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 21:23:19,379 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 21:23:19,383 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 21:23:19,384 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:23:19" (1/1) ... [2020-08-21 21:23:19,388 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1dbafe48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:19, skipping insertion in model container [2020-08-21 21:23:19,389 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:23:19" (1/1) ... [2020-08-21 21:23:19,398 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 21:23:19,417 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 21:23:19,607 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:23:19,618 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 21:23:19,640 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:23:19,745 INFO L208 MainTranslator]: Completed translation [2020-08-21 21:23:19,746 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:19 WrapperNode [2020-08-21 21:23:19,746 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 21:23:19,747 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 21:23:19,747 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 21:23:19,747 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 21:23:19,762 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:19" (1/1) ... [2020-08-21 21:23:19,762 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:19" (1/1) ... [2020-08-21 21:23:19,771 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:19" (1/1) ... [2020-08-21 21:23:19,772 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:19" (1/1) ... [2020-08-21 21:23:19,780 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:19" (1/1) ... [2020-08-21 21:23:19,785 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:19" (1/1) ... [2020-08-21 21:23:19,787 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:19" (1/1) ... [2020-08-21 21:23:19,789 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 21:23:19,789 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 21:23:19,789 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 21:23:19,790 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 21:23:19,791 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:19" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-21 21:23:19,853 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 21:23:19,853 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 21:23:19,854 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 21:23:19,855 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 21:23:19,855 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 21:23:19,855 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 21:23:19,856 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 21:23:19,856 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 21:23:19,856 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 21:23:19,857 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 21:23:19,857 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 21:23:19,858 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 21:23:19,858 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 21:23:19,858 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 21:23:20,154 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 21:23:20,155 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 21:23:20,158 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:23:20 BoogieIcfgContainer [2020-08-21 21:23:20,158 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 21:23:20,159 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 21:23:20,160 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 21:23:20,162 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 21:23:20,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:23:19" (1/3) ... [2020-08-21 21:23:20,164 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5acab645 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:23:20, skipping insertion in model container [2020-08-21 21:23:20,164 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:23:19" (2/3) ... [2020-08-21 21:23:20,164 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5acab645 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:23:20, skipping insertion in model container [2020-08-21 21:23:20,164 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:23:20" (3/3) ... [2020-08-21 21:23:20,166 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-08-21 21:23:20,176 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 21:23:20,183 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 21:23:20,196 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 21:23:20,219 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 21:23:20,219 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 21:23:20,220 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 21:23:20,220 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 21:23:20,220 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 21:23:20,220 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 21:23:20,220 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 21:23:20,220 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 21:23:20,237 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 21:23:20,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 21:23:20,242 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:20,243 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:20,243 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:20,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:20,249 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-08-21 21:23:20,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:20,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52193327] [2020-08-21 21:23:20,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:20,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:20,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:20,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:20,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 21:23:20,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:20,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:20,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52193327] [2020-08-21 21:23:20,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:23:20,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 21:23:20,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500253158] [2020-08-21 21:23:20,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 21:23:20,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:20,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 21:23:20,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:23:20,478 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 21:23:20,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:20,588 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-08-21 21:23:20,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 21:23:20,590 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 21:23:20,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:20,600 INFO L225 Difference]: With dead ends: 42 [2020-08-21 21:23:20,600 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 21:23:20,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:23:20,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 21:23:20,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 21:23:20,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 21:23:20,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 21:23:20,646 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-21 21:23:20,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:20,646 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 21:23:20,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 21:23:20,647 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 21:23:20,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 21:23:20,648 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:20,648 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:20,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 21:23:20,649 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:20,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:20,650 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-08-21 21:23:20,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:20,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1476470188] [2020-08-21 21:23:20,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:20,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:20,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:20,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:20,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 21:23:20,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:20,778 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:20,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1476470188] [2020-08-21 21:23:20,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:23:20,784 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 21:23:20,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174218613] [2020-08-21 21:23:20,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:23:20,786 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:20,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:23:20,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:23:20,787 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-21 21:23:20,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:20,853 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-21 21:23:20,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 21:23:20,854 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-21 21:23:20,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:20,855 INFO L225 Difference]: With dead ends: 34 [2020-08-21 21:23:20,855 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 21:23:20,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:23:20,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 21:23:20,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 21:23:20,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 21:23:20,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 21:23:20,864 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-21 21:23:20,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:20,864 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 21:23:20,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 21:23:20,864 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 21:23:20,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 21:23:20,865 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:20,866 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] [2020-08-21 21:23:20,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 21:23:20,866 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:20,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:20,867 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-08-21 21:23:20,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:20,868 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146835886] [2020-08-21 21:23:20,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:20,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:20,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:20,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:20,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-21 21:23:20,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:20,986 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:20,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146835886] [2020-08-21 21:23:20,986 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:20,987 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 21:23:20,988 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664115072] [2020-08-21 21:23:20,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:23:20,989 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:20,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:23:20,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:23:20,991 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-21 21:23:21,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:21,060 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-21 21:23:21,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:23:21,061 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-21 21:23:21,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:21,062 INFO L225 Difference]: With dead ends: 36 [2020-08-21 21:23:21,062 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 21:23:21,063 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:23:21,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 21:23:21,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 21:23:21,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 21:23:21,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 21:23:21,069 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-21 21:23:21,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:21,069 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 21:23:21,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:23:21,070 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 21:23:21,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 21:23:21,071 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:21,071 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:21,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 21:23:21,071 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:21,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:21,072 INFO L82 PathProgramCache]: Analyzing trace with hash 1739404943, now seen corresponding path program 2 times [2020-08-21 21:23:21,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:21,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [549659912] [2020-08-21 21:23:21,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:21,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:21,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-21 21:23:21,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,168 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:21,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [549659912] [2020-08-21 21:23:21,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:21,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 21:23:21,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294057816] [2020-08-21 21:23:21,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:23:21,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:21,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:23:21,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:23:21,171 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-21 21:23:21,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:21,243 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-21 21:23:21,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 21:23:21,244 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 21:23:21,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:21,245 INFO L225 Difference]: With dead ends: 38 [2020-08-21 21:23:21,246 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 21:23:21,246 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:23:21,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 21:23:21,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 21:23:21,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 21:23:21,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-21 21:23:21,253 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-21 21:23:21,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:21,254 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-21 21:23:21,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:23:21,254 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-21 21:23:21,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 21:23:21,255 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:21,256 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:21,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 21:23:21,256 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:21,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:21,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1328015311, now seen corresponding path program 3 times [2020-08-21 21:23:21,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:21,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1420021846] [2020-08-21 21:23:21,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:21,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:21,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 21:23:21,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,377 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:21,378 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1420021846] [2020-08-21 21:23:21,378 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:21,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 21:23:21,378 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375935103] [2020-08-21 21:23:21,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 21:23:21,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:21,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 21:23:21,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:23:21,380 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-21 21:23:21,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:21,445 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-21 21:23:21,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 21:23:21,446 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-21 21:23:21,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:21,447 INFO L225 Difference]: With dead ends: 40 [2020-08-21 21:23:21,447 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 21:23:21,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:23:21,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 21:23:21,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 21:23:21,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 21:23:21,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 21:23:21,454 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-21 21:23:21,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:21,454 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 21:23:21,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 21:23:21,454 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 21:23:21,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 21:23:21,455 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:21,455 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] [2020-08-21 21:23:21,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 21:23:21,456 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:21,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:21,456 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 4 times [2020-08-21 21:23:21,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:21,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [644775188] [2020-08-21 21:23:21,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:21,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:21,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 21:23:21,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,555 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:21,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [644775188] [2020-08-21 21:23:21,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:21,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 21:23:21,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589874419] [2020-08-21 21:23:21,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 21:23:21,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:21,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 21:23:21,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:23:21,558 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-21 21:23:21,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:21,629 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-21 21:23:21,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 21:23:21,630 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 21:23:21,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:21,631 INFO L225 Difference]: With dead ends: 42 [2020-08-21 21:23:21,631 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 21:23:21,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:23:21,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 21:23:21,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 21:23:21,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 21:23:21,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-21 21:23:21,637 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-21 21:23:21,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:21,637 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-21 21:23:21,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 21:23:21,638 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-21 21:23:21,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 21:23:21,638 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:21,639 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:21,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 21:23:21,639 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:21,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:21,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1787714037, now seen corresponding path program 5 times [2020-08-21 21:23:21,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:21,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315397653] [2020-08-21 21:23:21,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:21,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:21,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 21:23:21,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,736 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:21,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315397653] [2020-08-21 21:23:21,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:21,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 21:23:21,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440657996] [2020-08-21 21:23:21,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 21:23:21,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:21,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 21:23:21,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:23:21,738 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-21 21:23:21,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:21,820 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-21 21:23:21,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 21:23:21,821 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 21:23:21,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:21,822 INFO L225 Difference]: With dead ends: 44 [2020-08-21 21:23:21,822 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 21:23:21,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:23:21,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 21:23:21,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 21:23:21,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 21:23:21,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-21 21:23:21,829 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-21 21:23:21,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:21,829 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-21 21:23:21,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 21:23:21,829 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-21 21:23:21,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 21:23:21,830 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:21,830 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:21,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 21:23:21,831 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:21,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:21,831 INFO L82 PathProgramCache]: Analyzing trace with hash 2147351063, now seen corresponding path program 6 times [2020-08-21 21:23:21,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:21,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [41890958] [2020-08-21 21:23:21,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:21,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:21,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 21:23:21,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:21,947 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:21,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [41890958] [2020-08-21 21:23:21,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:21,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 21:23:21,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922456849] [2020-08-21 21:23:21,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 21:23:21,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:21,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 21:23:21,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:23:21,950 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-21 21:23:22,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:22,022 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-21 21:23:22,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 21:23:22,023 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 21:23:22,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:22,023 INFO L225 Difference]: With dead ends: 46 [2020-08-21 21:23:22,024 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 21:23:22,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:23:22,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 21:23:22,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 21:23:22,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 21:23:22,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 21:23:22,030 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-21 21:23:22,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:22,030 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 21:23:22,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 21:23:22,030 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 21:23:22,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 21:23:22,031 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:22,031 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:22,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 21:23:22,032 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:22,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:22,032 INFO L82 PathProgramCache]: Analyzing trace with hash -133817927, now seen corresponding path program 7 times [2020-08-21 21:23:22,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:22,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [853122932] [2020-08-21 21:23:22,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:22,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:22,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 21:23:22,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,146 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:22,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [853122932] [2020-08-21 21:23:22,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:22,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 21:23:22,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149605349] [2020-08-21 21:23:22,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 21:23:22,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:22,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 21:23:22,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:23:22,149 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 21:23:22,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:22,234 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 21:23:22,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 21:23:22,235 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 21:23:22,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:22,236 INFO L225 Difference]: With dead ends: 48 [2020-08-21 21:23:22,237 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 21:23:22,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:23:22,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 21:23:22,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 21:23:22,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 21:23:22,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-21 21:23:22,243 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-21 21:23:22,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:22,244 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-21 21:23:22,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 21:23:22,244 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-21 21:23:22,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 21:23:22,245 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:22,245 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:22,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 21:23:22,246 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:22,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:22,246 INFO L82 PathProgramCache]: Analyzing trace with hash -1903896357, now seen corresponding path program 8 times [2020-08-21 21:23:22,246 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:22,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [421579252] [2020-08-21 21:23:22,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:22,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:22,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 21:23:22,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,378 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:22,379 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [421579252] [2020-08-21 21:23:22,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:22,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 21:23:22,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129224522] [2020-08-21 21:23:22,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 21:23:22,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:22,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 21:23:22,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:23:22,381 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-21 21:23:22,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:22,456 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-21 21:23:22,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 21:23:22,457 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 21:23:22,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:22,458 INFO L225 Difference]: With dead ends: 50 [2020-08-21 21:23:22,458 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 21:23:22,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:23:22,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 21:23:22,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 21:23:22,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 21:23:22,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-21 21:23:22,464 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-21 21:23:22,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:22,464 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-21 21:23:22,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 21:23:22,465 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-21 21:23:22,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 21:23:22,465 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:22,466 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:22,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 21:23:22,466 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:22,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:22,466 INFO L82 PathProgramCache]: Analyzing trace with hash -2142218371, now seen corresponding path program 9 times [2020-08-21 21:23:22,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:22,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346576396] [2020-08-21 21:23:22,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:22,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:22,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 21:23:22,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,591 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:22,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346576396] [2020-08-21 21:23:22,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:22,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 21:23:22,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376590622] [2020-08-21 21:23:22,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 21:23:22,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:22,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 21:23:22,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:23:22,594 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-21 21:23:22,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:22,681 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-08-21 21:23:22,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 21:23:22,682 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 21:23:22,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:22,683 INFO L225 Difference]: With dead ends: 52 [2020-08-21 21:23:22,683 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 21:23:22,684 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:23:22,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 21:23:22,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 21:23:22,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 21:23:22,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 21:23:22,689 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-21 21:23:22,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:22,689 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 21:23:22,689 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 21:23:22,689 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 21:23:22,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 21:23:22,690 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:22,690 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:22,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 21:23:22,691 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:22,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:22,691 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 10 times [2020-08-21 21:23:22,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:22,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1390891686] [2020-08-21 21:23:22,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:22,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:22,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 21:23:22,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:22,825 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:22,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1390891686] [2020-08-21 21:23:22,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:22,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 21:23:22,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046304886] [2020-08-21 21:23:22,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 21:23:22,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:22,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 21:23:22,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:23:22,828 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 14 states. [2020-08-21 21:23:22,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:22,915 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-08-21 21:23:22,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 21:23:22,916 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-08-21 21:23:22,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:22,917 INFO L225 Difference]: With dead ends: 54 [2020-08-21 21:23:22,917 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 21:23:22,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:23:22,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 21:23:22,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 21:23:22,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 21:23:22,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-21 21:23:22,922 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-21 21:23:22,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:22,923 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-21 21:23:22,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 21:23:22,923 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-21 21:23:22,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 21:23:22,924 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:22,924 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:22,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 21:23:22,924 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:22,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:22,925 INFO L82 PathProgramCache]: Analyzing trace with hash 972952385, now seen corresponding path program 11 times [2020-08-21 21:23:22,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:22,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [832256302] [2020-08-21 21:23:22,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:22,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:23,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 21:23:23,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,101 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:23,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [832256302] [2020-08-21 21:23:23,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:23,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 21:23:23,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472220947] [2020-08-21 21:23:23,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 21:23:23,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:23,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 21:23:23,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:23:23,104 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 15 states. [2020-08-21 21:23:23,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:23,197 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-08-21 21:23:23,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 21:23:23,198 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2020-08-21 21:23:23,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:23,198 INFO L225 Difference]: With dead ends: 56 [2020-08-21 21:23:23,199 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 21:23:23,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:23:23,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 21:23:23,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 21:23:23,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 21:23:23,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-21 21:23:23,204 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-21 21:23:23,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:23,205 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-21 21:23:23,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 21:23:23,205 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-21 21:23:23,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 21:23:23,206 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:23,206 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:23,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 21:23:23,206 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:23,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:23,207 INFO L82 PathProgramCache]: Analyzing trace with hash 845451363, now seen corresponding path program 12 times [2020-08-21 21:23:23,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:23,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1572962695] [2020-08-21 21:23:23,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:23,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:23,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-21 21:23:23,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,380 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:23,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1572962695] [2020-08-21 21:23:23,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:23,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 21:23:23,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801388343] [2020-08-21 21:23:23,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 21:23:23,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:23,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 21:23:23,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:23:23,383 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 16 states. [2020-08-21 21:23:23,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:23,477 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-08-21 21:23:23,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 21:23:23,478 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2020-08-21 21:23:23,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:23,479 INFO L225 Difference]: With dead ends: 58 [2020-08-21 21:23:23,479 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 21:23:23,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:23:23,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 21:23:23,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 21:23:23,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 21:23:23,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 21:23:23,485 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2020-08-21 21:23:23,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:23,485 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 21:23:23,485 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 21:23:23,485 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 21:23:23,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 21:23:23,486 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:23,486 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:23,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 21:23:23,487 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:23,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:23,487 INFO L82 PathProgramCache]: Analyzing trace with hash -1423946491, now seen corresponding path program 13 times [2020-08-21 21:23:23,487 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:23,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352389092] [2020-08-21 21:23:23,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:23,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:23,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 21:23:23,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:23,664 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:23,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352389092] [2020-08-21 21:23:23,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:23,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 21:23:23,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020650913] [2020-08-21 21:23:23,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 21:23:23,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:23,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 21:23:23,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:23:23,667 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 17 states. [2020-08-21 21:23:23,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:23,795 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2020-08-21 21:23:23,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 21:23:23,795 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 44 [2020-08-21 21:23:23,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:23,796 INFO L225 Difference]: With dead ends: 60 [2020-08-21 21:23:23,796 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 21:23:23,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:23:23,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 21:23:23,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-21 21:23:23,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 21:23:23,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-08-21 21:23:23,802 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2020-08-21 21:23:23,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:23,802 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-08-21 21:23:23,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 21:23:23,802 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-08-21 21:23:23,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 21:23:23,803 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:23,803 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:23,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 21:23:23,804 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:23,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:23,804 INFO L82 PathProgramCache]: Analyzing trace with hash -471897817, now seen corresponding path program 14 times [2020-08-21 21:23:23,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:23,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2048464135] [2020-08-21 21:23:23,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:23,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:24,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-21 21:23:24,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,018 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:24,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2048464135] [2020-08-21 21:23:24,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:24,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 21:23:24,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889409422] [2020-08-21 21:23:24,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 21:23:24,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:24,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 21:23:24,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:23:24,020 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 18 states. [2020-08-21 21:23:24,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:24,119 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2020-08-21 21:23:24,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 21:23:24,119 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 46 [2020-08-21 21:23:24,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:24,120 INFO L225 Difference]: With dead ends: 62 [2020-08-21 21:23:24,120 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 21:23:24,121 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:23:24,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 21:23:24,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-21 21:23:24,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 21:23:24,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-08-21 21:23:24,125 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-08-21 21:23:24,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:24,126 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-08-21 21:23:24,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 21:23:24,126 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-08-21 21:23:24,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 21:23:24,127 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:24,127 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:24,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 21:23:24,127 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:24,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:24,128 INFO L82 PathProgramCache]: Analyzing trace with hash -381156151, now seen corresponding path program 15 times [2020-08-21 21:23:24,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:24,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1004070847] [2020-08-21 21:23:24,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:24,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:24,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-21 21:23:24,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,345 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:24,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1004070847] [2020-08-21 21:23:24,346 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:24,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 21:23:24,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956321157] [2020-08-21 21:23:24,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 21:23:24,347 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:24,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 21:23:24,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:23:24,348 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 19 states. [2020-08-21 21:23:24,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:24,441 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2020-08-21 21:23:24,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 21:23:24,442 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-08-21 21:23:24,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:24,443 INFO L225 Difference]: With dead ends: 64 [2020-08-21 21:23:24,444 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 21:23:24,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:23:24,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 21:23:24,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 21:23:24,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 21:23:24,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-21 21:23:24,455 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2020-08-21 21:23:24,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:24,457 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-21 21:23:24,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 21:23:24,457 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-21 21:23:24,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 21:23:24,459 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:24,459 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:24,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 21:23:24,460 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:24,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:24,460 INFO L82 PathProgramCache]: Analyzing trace with hash 922238955, now seen corresponding path program 16 times [2020-08-21 21:23:24,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:24,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975388452] [2020-08-21 21:23:24,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:24,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:24,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-21 21:23:24,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:24,766 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:24,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975388452] [2020-08-21 21:23:24,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:24,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 21:23:24,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648485960] [2020-08-21 21:23:24,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 21:23:24,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:24,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 21:23:24,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:23:24,774 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 20 states. [2020-08-21 21:23:24,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:24,889 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2020-08-21 21:23:24,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 21:23:24,889 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2020-08-21 21:23:24,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:24,890 INFO L225 Difference]: With dead ends: 66 [2020-08-21 21:23:24,891 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 21:23:24,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:23:24,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 21:23:24,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 21:23:24,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 21:23:24,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-08-21 21:23:24,901 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2020-08-21 21:23:24,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:24,901 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-08-21 21:23:24,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 21:23:24,901 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-08-21 21:23:24,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 21:23:24,905 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:24,905 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:24,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 21:23:24,906 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:24,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:24,906 INFO L82 PathProgramCache]: Analyzing trace with hash -645514611, now seen corresponding path program 17 times [2020-08-21 21:23:24,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:24,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [655726393] [2020-08-21 21:23:24,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:24,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:25,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:25,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:25,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-21 21:23:25,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:25,164 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:25,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [655726393] [2020-08-21 21:23:25,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:25,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 21:23:25,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975998335] [2020-08-21 21:23:25,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 21:23:25,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:25,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 21:23:25,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:23:25,167 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 21 states. [2020-08-21 21:23:25,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:25,297 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2020-08-21 21:23:25,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 21:23:25,298 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 52 [2020-08-21 21:23:25,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:25,298 INFO L225 Difference]: With dead ends: 68 [2020-08-21 21:23:25,299 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 21:23:25,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:23:25,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 21:23:25,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 21:23:25,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 21:23:25,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-08-21 21:23:25,304 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-08-21 21:23:25,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:25,305 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-08-21 21:23:25,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 21:23:25,305 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-08-21 21:23:25,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 21:23:25,305 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:25,306 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:25,306 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 21:23:25,306 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:25,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:25,306 INFO L82 PathProgramCache]: Analyzing trace with hash 276829359, now seen corresponding path program 18 times [2020-08-21 21:23:25,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:25,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [75984919] [2020-08-21 21:23:25,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:25,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:25,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:25,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:25,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-08-21 21:23:25,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:25,614 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:25,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [75984919] [2020-08-21 21:23:25,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:25,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 21:23:25,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274272917] [2020-08-21 21:23:25,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 21:23:25,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:25,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 21:23:25,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:23:25,617 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 22 states. [2020-08-21 21:23:25,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:25,700 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2020-08-21 21:23:25,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 21:23:25,700 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 54 [2020-08-21 21:23:25,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:25,701 INFO L225 Difference]: With dead ends: 70 [2020-08-21 21:23:25,701 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 21:23:25,702 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:23:25,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 21:23:25,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 21:23:25,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 21:23:25,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-21 21:23:25,705 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2020-08-21 21:23:25,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:25,706 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-21 21:23:25,706 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 21:23:25,706 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-21 21:23:25,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 21:23:25,706 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:25,707 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:25,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 21:23:25,707 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:25,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:25,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1886121553, now seen corresponding path program 19 times [2020-08-21 21:23:25,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:25,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930051817] [2020-08-21 21:23:25,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:25,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:25,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:23:25,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:25,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-21 21:23:25,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:23:26,000 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:23:26,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930051817] [2020-08-21 21:23:26,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:23:26,001 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 21:23:26,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31396508] [2020-08-21 21:23:26,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 21:23:26,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:23:26,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 21:23:26,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:23:26,003 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 23 states. [2020-08-21 21:23:26,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:23:26,130 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2020-08-21 21:23:26,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 21:23:26,131 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 56 [2020-08-21 21:23:26,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:23:26,132 INFO L225 Difference]: With dead ends: 71 [2020-08-21 21:23:26,132 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 21:23:26,133 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:23:26,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 21:23:26,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 21:23:26,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 21:23:26,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-08-21 21:23:26,140 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2020-08-21 21:23:26,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:23:26,141 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-08-21 21:23:26,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 21:23:26,141 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-08-21 21:23:26,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 21:23:26,143 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:23:26,143 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:23:26,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 21:23:26,143 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:23:26,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:23:26,144 INFO L82 PathProgramCache]: Analyzing trace with hash -2067273869, now seen corresponding path program 20 times [2020-08-21 21:23:26,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:23:26,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1164381342] [2020-08-21 21:23:26,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:23:26,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 21:23:26,274 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 21:23:26,275 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 21:23:26,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 21:23:26,314 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 09:23:26 BoogieIcfgContainer [2020-08-21 21:23:26,314 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 21:23:26,323 INFO L168 Benchmark]: Toolchain (without parser) took 6942.21 ms. Allocated memory was 148.4 MB in the beginning and 302.5 MB in the end (delta: 154.1 MB). Free memory was 103.4 MB in the beginning and 146.7 MB in the end (delta: -43.3 MB). Peak memory consumption was 110.8 MB. Max. memory is 7.1 GB. [2020-08-21 21:23:26,330 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 148.4 MB. Free memory was 121.7 MB in the beginning and 121.2 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. [2020-08-21 21:23:26,331 INFO L168 Benchmark]: CACSL2BoogieTranslator took 367.68 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 103.4 MB in the beginning and 183.6 MB in the end (delta: -80.1 MB). Peak memory consumption was 20.1 MB. Max. memory is 7.1 GB. [2020-08-21 21:23:26,331 INFO L168 Benchmark]: Boogie Preprocessor took 42.13 ms. Allocated memory is still 205.0 MB. Free memory was 183.6 MB in the beginning and 181.3 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 7.1 GB. [2020-08-21 21:23:26,332 INFO L168 Benchmark]: RCFGBuilder took 369.02 ms. Allocated memory is still 205.0 MB. Free memory was 181.3 MB in the beginning and 165.9 MB in the end (delta: 15.4 MB). Peak memory consumption was 15.4 MB. Max. memory is 7.1 GB. [2020-08-21 21:23:26,332 INFO L168 Benchmark]: TraceAbstraction took 6154.90 ms. Allocated memory was 205.0 MB in the beginning and 302.5 MB in the end (delta: 97.5 MB). Free memory was 165.9 MB in the beginning and 146.7 MB in the end (delta: 19.2 MB). Peak memory consumption was 116.7 MB. Max. memory is 7.1 GB. [2020-08-21 21:23:26,338 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 148.4 MB. Free memory was 121.7 MB in the beginning and 121.2 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 367.68 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 103.4 MB in the beginning and 183.6 MB in the end (delta: -80.1 MB). Peak memory consumption was 20.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 42.13 ms. Allocated memory is still 205.0 MB. Free memory was 183.6 MB in the beginning and 181.3 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 369.02 ms. Allocated memory is still 205.0 MB. Free memory was 181.3 MB in the beginning and 165.9 MB in the end (delta: 15.4 MB). Peak memory consumption was 15.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6154.90 ms. Allocated memory was 205.0 MB in the beginning and 302.5 MB in the end (delta: 97.5 MB). Free memory was 165.9 MB in the beginning and 146.7 MB in the end (delta: 19.2 MB). Peak memory consumption was 116.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 37]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L15] struct dummy ad1[20], *ad2; [L16] int i, j, *pa; [L17] j=0 [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND TRUE j<20 [L18] ad1[j].a = __VERIFIER_nondet_int() [L19] ad1[j].b = __VERIFIER_nondet_int() [L17] j++ [L17] COND FALSE !(j<20) [L21] i = __VERIFIER_nondet_int() [L22] COND TRUE i >= 0 && i < 10 [L23] ad2 = ad1 [L24] ad1[i].a = i [L25] pa = &ad1[i].a [L26] EXPR ad2[i].a [L26] i = ad2[i].a + 10 [L27] EXPR \read(*pa) [L27] COND FALSE !(i < *pa) [L30] CALL, EXPR check(ad1, i) [L10] EXPR ad1[b].a [L10] return ad1[b].a == b; [L30] RET, EXPR check(ad1, i) [L30] COND TRUE !check(ad1, i) [L37] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.0s, OverallIterations: 22, TraceHistogramMax: 20, AutomataDifference: 2.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 365 SDtfs, 252 SDslu, 1934 SDs, 0 SdLazy, 1339 SolverSat, 72 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 336 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 2.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=59occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 21 MinimizatonAttempts, 19 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 3.0s InterpolantComputationTime, 815 NumberOfCodeBlocks, 815 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 736 ConstructedInterpolants, 0 QuantifiedInterpolants, 69580 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 21 InterpolantComputations, 2 PerfectInterpolantSequences, 0/2470 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...