/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum04-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-89f541c [2020-08-27 21:58:38,944 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-27 21:58:38,949 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-27 21:58:38,998 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-27 21:58:38,998 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-27 21:58:39,009 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-27 21:58:39,012 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-27 21:58:39,017 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-27 21:58:39,020 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-27 21:58:39,023 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-27 21:58:39,024 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-27 21:58:39,026 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-27 21:58:39,026 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-27 21:58:39,031 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-27 21:58:39,034 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-27 21:58:39,036 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-27 21:58:39,038 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-27 21:58:39,039 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-27 21:58:39,042 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-27 21:58:39,048 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-27 21:58:39,052 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-27 21:58:39,053 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-27 21:58:39,054 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-27 21:58:39,055 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-27 21:58:39,060 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-27 21:58:39,060 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-27 21:58:39,061 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-27 21:58:39,064 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-27 21:58:39,065 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-27 21:58:39,066 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-27 21:58:39,066 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-27 21:58:39,067 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-27 21:58:39,068 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-27 21:58:39,069 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-27 21:58:39,070 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-27 21:58:39,070 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-27 21:58:39,071 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-27 21:58:39,071 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-27 21:58:39,072 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-27 21:58:39,073 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-27 21:58:39,074 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-27 21:58:39,075 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 [2020-08-27 21:58:39,128 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-27 21:58:39,128 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-27 21:58:39,129 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-27 21:58:39,130 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-27 21:58:39,130 INFO L138 SettingsManager]: * Use SBE=true [2020-08-27 21:58:39,130 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-27 21:58:39,130 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-27 21:58:39,130 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-27 21:58:39,131 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-27 21:58:39,131 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-27 21:58:39,131 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-27 21:58:39,131 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-27 21:58:39,131 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-27 21:58:39,132 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-27 21:58:39,132 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-27 21:58:39,132 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-27 21:58:39,132 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-27 21:58:39,133 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-27 21:58:39,133 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-27 21:58:39,133 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-27 21:58:39,133 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-27 21:58:39,133 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-27 21:58:39,134 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-27 21:58:39,134 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-27 21:58:39,134 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-27 21:58:39,134 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-27 21:58:39,134 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-27 21:58:39,135 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-27 21:58:39,135 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-27 21:58:39,135 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 -> false [2020-08-27 21:58:39,577 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-27 21:58:39,594 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-27 21:58:39,598 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-27 21:58:39,600 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-27 21:58:39,600 INFO L275 PluginConnector]: CDTParser initialized [2020-08-27 21:58:39,602 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-1.i [2020-08-27 21:58:39,695 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/41139b78d/4f064625640e44e5ba6cb9c73f1249a5/FLAG8e9973823 [2020-08-27 21:58:40,250 INFO L306 CDTParser]: Found 1 translation units. [2020-08-27 21:58:40,251 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/sum04-1.i [2020-08-27 21:58:40,259 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/41139b78d/4f064625640e44e5ba6cb9c73f1249a5/FLAG8e9973823 [2020-08-27 21:58:40,597 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/41139b78d/4f064625640e44e5ba6cb9c73f1249a5 [2020-08-27 21:58:40,611 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-27 21:58:40,614 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-27 21:58:40,615 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-27 21:58:40,615 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-27 21:58:40,620 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-27 21:58:40,622 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 09:58:40" (1/1) ... [2020-08-27 21:58:40,626 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@243023c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:58:40, skipping insertion in model container [2020-08-27 21:58:40,626 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 09:58:40" (1/1) ... [2020-08-27 21:58:40,636 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-27 21:58:40,668 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-27 21:58:40,876 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-27 21:58:40,882 INFO L203 MainTranslator]: Completed pre-run [2020-08-27 21:58:40,901 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-27 21:58:40,916 INFO L208 MainTranslator]: Completed translation [2020-08-27 21:58:40,916 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:58:40 WrapperNode [2020-08-27 21:58:40,916 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-27 21:58:40,917 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-27 21:58:40,917 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-27 21:58:40,918 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-27 21:58:40,931 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:58:40" (1/1) ... [2020-08-27 21:58:40,931 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:58:40" (1/1) ... [2020-08-27 21:58:40,937 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:58:40" (1/1) ... [2020-08-27 21:58:40,938 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:58:40" (1/1) ... [2020-08-27 21:58:40,942 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:58:40" (1/1) ... [2020-08-27 21:58:40,948 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:58:40" (1/1) ... [2020-08-27 21:58:40,949 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:58:40" (1/1) ... [2020-08-27 21:58:41,026 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-27 21:58:41,027 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-27 21:58:41,027 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-27 21:58:41,028 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-27 21:58:41,029 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:58:40" (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 [2020-08-27 21:58:41,109 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-27 21:58:41,109 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-27 21:58:41,109 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-27 21:58:41,109 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-27 21:58:41,110 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-27 21:58:41,110 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-27 21:58:41,110 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-27 21:58:41,110 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-27 21:58:41,110 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-27 21:58:41,298 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-27 21:58:41,299 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-27 21:58:41,304 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 09:58:41 BoogieIcfgContainer [2020-08-27 21:58:41,304 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-27 21:58:41,305 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-27 21:58:41,305 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-27 21:58:41,309 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-27 21:58:41,310 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.08 09:58:40" (1/3) ... [2020-08-27 21:58:41,311 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74362075 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 09:58:41, skipping insertion in model container [2020-08-27 21:58:41,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:58:40" (2/3) ... [2020-08-27 21:58:41,311 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74362075 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 09:58:41, skipping insertion in model container [2020-08-27 21:58:41,312 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 09:58:41" (3/3) ... [2020-08-27 21:58:41,314 INFO L109 eAbstractionObserver]: Analyzing ICFG sum04-1.i [2020-08-27 21:58:41,324 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-27 21:58:41,333 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-27 21:58:41,354 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-27 21:58:41,382 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-27 21:58:41,382 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-27 21:58:41,383 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-27 21:58:41,383 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-27 21:58:41,383 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-27 21:58:41,384 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-27 21:58:41,384 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-27 21:58:41,384 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-27 21:58:41,404 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-27 21:58:41,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-27 21:58:41,411 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:58:41,412 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:58:41,412 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:58:41,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:58:41,419 INFO L82 PathProgramCache]: Analyzing trace with hash -721501374, now seen corresponding path program 1 times [2020-08-27 21:58:41,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:58:41,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301340125] [2020-08-27 21:58:41,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:58:41,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:41,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:58:41,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:41,558 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:58:41,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301340125] [2020-08-27 21:58:41,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:58:41,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-27 21:58:41,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836731873] [2020-08-27 21:58:41,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-27 21:58:41,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:58:41,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-27 21:58:41,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-27 21:58:41,591 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2020-08-27 21:58:41,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:58:41,621 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-27 21:58:41,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-27 21:58:41,623 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-27 21:58:41,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:58:41,634 INFO L225 Difference]: With dead ends: 30 [2020-08-27 21:58:41,634 INFO L226 Difference]: Without dead ends: 13 [2020-08-27 21:58:41,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-27 21:58:41,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-27 21:58:41,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-27 21:58:41,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-27 21:58:41,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-27 21:58:41,691 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-27 21:58:41,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:58:41,692 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-27 21:58:41,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-27 21:58:41,693 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-27 21:58:41,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-27 21:58:41,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:58:41,695 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:58:41,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-27 21:58:41,695 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:58:41,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:58:41,696 INFO L82 PathProgramCache]: Analyzing trace with hash -731660105, now seen corresponding path program 1 times [2020-08-27 21:58:41,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:58:41,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [963053861] [2020-08-27 21:58:41,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:58:41,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:41,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:58:41,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:41,755 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:58:41,756 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [963053861] [2020-08-27 21:58:41,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:58:41,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-27 21:58:41,757 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003840119] [2020-08-27 21:58:41,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-27 21:58:41,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:58:41,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-27 21:58:41,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-27 21:58:41,760 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2020-08-27 21:58:41,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:58:41,792 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2020-08-27 21:58:41,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-27 21:58:41,793 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-27 21:58:41,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:58:41,794 INFO L225 Difference]: With dead ends: 24 [2020-08-27 21:58:41,795 INFO L226 Difference]: Without dead ends: 16 [2020-08-27 21:58:41,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-27 21:58:41,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-27 21:58:41,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-27 21:58:41,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-27 21:58:41,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-27 21:58:41,802 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2020-08-27 21:58:41,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:58:41,803 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-27 21:58:41,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-27 21:58:41,803 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-27 21:58:41,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-27 21:58:41,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:58:41,804 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:58:41,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-27 21:58:41,805 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:58:41,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:58:41,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1637338477, now seen corresponding path program 1 times [2020-08-27 21:58:41,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:58:41,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [943200956] [2020-08-27 21:58:41,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:58:41,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:41,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:58:41,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:41,930 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:58:41,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [943200956] [2020-08-27 21:58:41,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:58:41,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-27 21:58:41,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786137118] [2020-08-27 21:58:41,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-27 21:58:41,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:58:41,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-27 21:58:41,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-27 21:58:41,937 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2020-08-27 21:58:42,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:58:42,004 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-27 21:58:42,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-27 21:58:42,005 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2020-08-27 21:58:42,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:58:42,006 INFO L225 Difference]: With dead ends: 27 [2020-08-27 21:58:42,006 INFO L226 Difference]: Without dead ends: 19 [2020-08-27 21:58:42,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-27 21:58:42,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-27 21:58:42,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2020-08-27 21:58:42,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-27 21:58:42,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-27 21:58:42,013 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-27 21:58:42,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:58:42,014 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-27 21:58:42,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-27 21:58:42,014 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-27 21:58:42,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-27 21:58:42,015 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:58:42,015 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:58:42,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-27 21:58:42,016 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:58:42,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:58:42,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1717165257, now seen corresponding path program 2 times [2020-08-27 21:58:42,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:58:42,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [564073929] [2020-08-27 21:58:42,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:58:42,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:42,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:58:42,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:42,094 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:58:42,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [564073929] [2020-08-27 21:58:42,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:58:42,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-27 21:58:42,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745757542] [2020-08-27 21:58:42,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-27 21:58:42,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:58:42,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-27 21:58:42,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-27 21:58:42,097 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 5 states. [2020-08-27 21:58:42,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:58:42,149 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-27 21:58:42,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-27 21:58:42,150 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-08-27 21:58:42,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:58:42,151 INFO L225 Difference]: With dead ends: 30 [2020-08-27 21:58:42,152 INFO L226 Difference]: Without dead ends: 22 [2020-08-27 21:58:42,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-27 21:58:42,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-27 21:58:42,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-27 21:58:42,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-27 21:58:42,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-27 21:58:42,159 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2020-08-27 21:58:42,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:58:42,159 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-27 21:58:42,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-27 21:58:42,160 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-27 21:58:42,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-27 21:58:42,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:58:42,161 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:58:42,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-27 21:58:42,161 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:58:42,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:58:42,161 INFO L82 PathProgramCache]: Analyzing trace with hash -424886253, now seen corresponding path program 3 times [2020-08-27 21:58:42,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:58:42,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1131017995] [2020-08-27 21:58:42,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:58:42,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:42,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:58:42,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:42,212 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-27 21:58:42,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1131017995] [2020-08-27 21:58:42,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:58:42,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-27 21:58:42,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727986870] [2020-08-27 21:58:42,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-27 21:58:42,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:58:42,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-27 21:58:42,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-27 21:58:42,216 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 4 states. [2020-08-27 21:58:42,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:58:42,246 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-08-27 21:58:42,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-27 21:58:42,247 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2020-08-27 21:58:42,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:58:42,248 INFO L225 Difference]: With dead ends: 30 [2020-08-27 21:58:42,248 INFO L226 Difference]: Without dead ends: 25 [2020-08-27 21:58:42,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-27 21:58:42,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-27 21:58:42,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2020-08-27 21:58:42,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-27 21:58:42,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-27 21:58:42,256 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 19 [2020-08-27 21:58:42,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:58:42,256 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-27 21:58:42,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-27 21:58:42,256 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-27 21:58:42,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-27 21:58:42,257 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:58:42,258 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:58:42,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-27 21:58:42,258 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:58:42,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:58:42,259 INFO L82 PathProgramCache]: Analyzing trace with hash -452912071, now seen corresponding path program 1 times [2020-08-27 21:58:42,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:58:42,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [887610] [2020-08-27 21:58:42,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:58:42,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:42,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:58:42,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:42,327 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-27 21:58:42,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [887610] [2020-08-27 21:58:42,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:58:42,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-27 21:58:42,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608900612] [2020-08-27 21:58:42,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-27 21:58:42,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:58:42,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-27 21:58:42,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-27 21:58:42,330 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 5 states. [2020-08-27 21:58:42,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:58:42,367 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-08-27 21:58:42,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-27 21:58:42,368 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 22 [2020-08-27 21:58:42,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:58:42,371 INFO L225 Difference]: With dead ends: 33 [2020-08-27 21:58:42,371 INFO L226 Difference]: Without dead ends: 28 [2020-08-27 21:58:42,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-27 21:58:42,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-27 21:58:42,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-08-27 21:58:42,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-27 21:58:42,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-27 21:58:42,379 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 22 [2020-08-27 21:58:42,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:58:42,380 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-27 21:58:42,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-27 21:58:42,380 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-27 21:58:42,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-27 21:58:42,381 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:58:42,381 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:58:42,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-27 21:58:42,382 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:58:42,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:58:42,382 INFO L82 PathProgramCache]: Analyzing trace with hash -2146400685, now seen corresponding path program 2 times [2020-08-27 21:58:42,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:58:42,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1483600017] [2020-08-27 21:58:42,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:58:42,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:42,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:58:42,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:42,471 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 21 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-27 21:58:42,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1483600017] [2020-08-27 21:58:42,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:58:42,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-27 21:58:42,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839420483] [2020-08-27 21:58:42,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-27 21:58:42,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:58:42,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-27 21:58:42,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-27 21:58:42,478 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 6 states. [2020-08-27 21:58:42,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:58:42,552 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-08-27 21:58:42,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-27 21:58:42,553 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-08-27 21:58:42,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:58:42,554 INFO L225 Difference]: With dead ends: 36 [2020-08-27 21:58:42,554 INFO L226 Difference]: Without dead ends: 31 [2020-08-27 21:58:42,555 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-27 21:58:42,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-27 21:58:42,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-08-27 21:58:42,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-27 21:58:42,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-08-27 21:58:42,570 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 25 [2020-08-27 21:58:42,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:58:42,570 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-08-27 21:58:42,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-27 21:58:42,571 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-08-27 21:58:42,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-27 21:58:42,572 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:58:42,572 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:58:42,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-27 21:58:42,573 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:58:42,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:58:42,574 INFO L82 PathProgramCache]: Analyzing trace with hash 115125753, now seen corresponding path program 3 times [2020-08-27 21:58:42,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:58:42,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115221058] [2020-08-27 21:58:42,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:58:42,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:42,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:58:42,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:42,716 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 29 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-27 21:58:42,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115221058] [2020-08-27 21:58:42,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:58:42,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-27 21:58:42,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176968929] [2020-08-27 21:58:42,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-27 21:58:42,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:58:42,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-27 21:58:42,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-08-27 21:58:42,719 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 7 states. [2020-08-27 21:58:42,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:58:42,772 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-08-27 21:58:42,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-27 21:58:42,772 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2020-08-27 21:58:42,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:58:42,774 INFO L225 Difference]: With dead ends: 39 [2020-08-27 21:58:42,774 INFO L226 Difference]: Without dead ends: 34 [2020-08-27 21:58:42,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-08-27 21:58:42,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-27 21:58:42,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-08-27 21:58:42,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-27 21:58:42,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2020-08-27 21:58:42,781 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 28 [2020-08-27 21:58:42,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:58:42,781 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2020-08-27 21:58:42,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-27 21:58:42,781 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2020-08-27 21:58:42,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-27 21:58:42,782 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:58:42,783 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:58:42,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-27 21:58:42,783 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:58:42,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:58:42,784 INFO L82 PathProgramCache]: Analyzing trace with hash -1902732141, now seen corresponding path program 4 times [2020-08-27 21:58:42,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:58:42,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [217103501] [2020-08-27 21:58:42,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:58:42,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:42,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:58:42,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:58:42,862 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 37 proven. 26 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-27 21:58:42,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [217103501] [2020-08-27 21:58:42,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:58:42,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-27 21:58:42,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137387389] [2020-08-27 21:58:42,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-27 21:58:42,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:58:42,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-27 21:58:42,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-08-27 21:58:42,865 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 8 states. [2020-08-27 21:58:42,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:58:42,939 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2020-08-27 21:58:42,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-27 21:58:42,940 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-27 21:58:42,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:58:42,941 INFO L225 Difference]: With dead ends: 40 [2020-08-27 21:58:42,944 INFO L226 Difference]: Without dead ends: 35 [2020-08-27 21:58:42,944 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-08-27 21:58:42,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-27 21:58:42,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-27 21:58:42,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-27 21:58:42,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2020-08-27 21:58:42,954 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 31 [2020-08-27 21:58:42,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:58:42,955 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2020-08-27 21:58:42,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-27 21:58:42,955 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2020-08-27 21:58:42,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-27 21:58:42,961 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:58:42,961 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:58:42,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-27 21:58:42,961 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:58:42,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:58:42,964 INFO L82 PathProgramCache]: Analyzing trace with hash 749989817, now seen corresponding path program 5 times [2020-08-27 21:58:42,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:58:42,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1306843849] [2020-08-27 21:58:42,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:58:42,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-27 21:58:42,994 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-27 21:58:42,994 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-27 21:58:42,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-27 21:58:43,027 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.08 09:58:43 BoogieIcfgContainer [2020-08-27 21:58:43,027 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-27 21:58:43,031 INFO L168 Benchmark]: Toolchain (without parser) took 2416.46 ms. Allocated memory was 140.5 MB in the beginning and 234.9 MB in the end (delta: 94.4 MB). Free memory was 103.8 MB in the beginning and 177.6 MB in the end (delta: -73.8 MB). Peak memory consumption was 20.5 MB. Max. memory is 7.1 GB. [2020-08-27 21:58:43,032 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 140.5 MB. Free memory was 122.1 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-27 21:58:43,033 INFO L168 Benchmark]: CACSL2BoogieTranslator took 302.09 ms. Allocated memory is still 140.5 MB. Free memory was 103.4 MB in the beginning and 94.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-27 21:58:43,034 INFO L168 Benchmark]: Boogie Preprocessor took 109.43 ms. Allocated memory was 140.5 MB in the beginning and 203.4 MB in the end (delta: 62.9 MB). Free memory was 94.1 MB in the beginning and 183.5 MB in the end (delta: -89.3 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-08-27 21:58:43,041 INFO L168 Benchmark]: RCFGBuilder took 276.85 ms. Allocated memory is still 203.4 MB. Free memory was 183.5 MB in the beginning and 170.7 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-27 21:58:43,043 INFO L168 Benchmark]: TraceAbstraction took 1722.18 ms. Allocated memory was 203.4 MB in the beginning and 234.9 MB in the end (delta: 31.5 MB). Free memory was 170.0 MB in the beginning and 177.6 MB in the end (delta: -7.6 MB). Peak memory consumption was 23.8 MB. Max. memory is 7.1 GB. [2020-08-27 21:58:43,053 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 140.5 MB. Free memory was 122.1 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 302.09 ms. Allocated memory is still 140.5 MB. Free memory was 103.4 MB in the beginning and 94.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 109.43 ms. Allocated memory was 140.5 MB in the beginning and 203.4 MB in the end (delta: 62.9 MB). Free memory was 94.1 MB in the beginning and 183.5 MB in the end (delta: -89.3 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 276.85 ms. Allocated memory is still 203.4 MB. Free memory was 183.5 MB in the beginning and 170.7 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1722.18 ms. Allocated memory was 203.4 MB in the beginning and 234.9 MB in the end (delta: 31.5 MB). Free memory was 170.0 MB in the beginning and 177.6 MB in the end (delta: -7.6 MB). Peak memory consumption was 23.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int i, sn=0; [L13] i=1 [L13] COND TRUE i<=8 [L14] COND TRUE i<4 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=8 [L14] COND TRUE i<4 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=8 [L14] COND TRUE i<4 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=8 [L14] COND FALSE !(i<4) [L13] i++ [L13] COND TRUE i<=8 [L14] COND FALSE !(i<4) [L13] i++ [L13] COND TRUE i<=8 [L14] COND FALSE !(i<4) [L13] i++ [L13] COND TRUE i<=8 [L14] COND FALSE !(i<4) [L13] i++ [L13] COND TRUE i<=8 [L14] COND FALSE !(i<4) [L13] i++ [L13] COND FALSE !(i<=8) [L17] CALL __VERIFIER_assert(sn==8*(2) || sn == 0) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.6s, OverallIterations: 10, TraceHistogramMax: 8, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 103 SDtfs, 57 SDslu, 208 SDs, 0 SdLazy, 136 SolverSat, 26 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 62 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=35occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 9 MinimizatonAttempts, 11 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 208 NumberOfCodeBlocks, 208 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 165 ConstructedInterpolants, 0 QuantifiedInterpolants, 5925 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 9 InterpolantComputations, 3 PerfectInterpolantSequences, 140/196 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...