/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 interpolation-heuristic=FIRST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 15:03:01,052 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 15:03:01,055 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 15:03:01,093 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 15:03:01,093 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:03:01,101 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:03:01,104 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:03:01,108 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:03:01,110 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:03:01,113 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:03:01,114 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:03:01,115 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:03:01,115 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:03:01,119 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:03:01,121 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:03:01,122 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:03:01,124 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:03:01,125 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:03:01,126 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:03:01,134 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:03:01,136 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:03:01,137 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:03:01,138 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:03:01,139 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:03:01,151 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 15:03:01,151 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 15:03:01,151 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 15:03:01,158 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 15:03:01,159 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 15:03:01,159 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 15:03:01,161 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 15:03:01,161 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 15:03:01,162 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 15:03:01,166 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 15:03:01,167 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 15:03:01,167 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 15:03:01,168 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 15:03:01,168 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 15:03:01,168 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:03:01,170 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:03:01,170 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:03:01,172 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 15:03:01,213 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:03:01,213 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:03:01,216 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:03:01,216 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:03:01,216 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:03:01,216 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:03:01,217 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:03:01,217 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:03:01,217 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:03:01,217 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:03:01,218 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:03:01,219 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:03:01,219 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:03:01,219 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:03:01,219 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:03:01,220 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:03:01,220 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:03:01,220 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:03:01,220 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:03:01,220 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:03:01,220 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:03:01,221 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:03:01,221 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:03:01,221 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:03:01,221 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:03:01,221 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:03:01,222 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:03:01,222 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:03:01,222 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:03:01,222 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 -> interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> interpolation-heuristic=FIRST;log-additional-information=true; [2020-08-21 15:03:01,499 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:03:01,514 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:03:01,517 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:03:01,518 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:03:01,519 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:03:01,520 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-08-21 15:03:01,597 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ad3446346/9c43e2de87bf407f97c43eb99bc45169/FLAG9121ab863 [2020-08-21 15:03:02,078 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:03:02,079 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-08-21 15:03:02,084 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ad3446346/9c43e2de87bf407f97c43eb99bc45169/FLAG9121ab863 [2020-08-21 15:03:02,473 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ad3446346/9c43e2de87bf407f97c43eb99bc45169 [2020-08-21 15:03:02,481 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:03:02,482 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:03:02,483 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:03:02,484 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:03:02,487 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:03:02,488 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:03:02" (1/1) ... [2020-08-21 15:03:02,492 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d0614b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:02, skipping insertion in model container [2020-08-21 15:03:02,492 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:03:02" (1/1) ... [2020-08-21 15:03:02,500 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:03:02,521 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:03:02,789 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:03:02,796 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:03:02,823 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:03:02,846 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:03:02,847 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:02 WrapperNode [2020-08-21 15:03:02,847 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:03:02,848 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:03:02,848 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:03:02,848 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:03:02,946 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:02" (1/1) ... [2020-08-21 15:03:02,948 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:02" (1/1) ... [2020-08-21 15:03:02,958 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:02" (1/1) ... [2020-08-21 15:03:02,958 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:02" (1/1) ... [2020-08-21 15:03:02,971 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:02" (1/1) ... [2020-08-21 15:03:02,975 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:02" (1/1) ... [2020-08-21 15:03:02,976 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:02" (1/1) ... [2020-08-21 15:03:02,978 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:03:02,979 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:03:02,979 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:03:02,979 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:03:02,980 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:02" (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 15:03:03,044 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:03:03,045 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:03:03,045 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 15:03:03,045 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:03:03,046 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:03:03,046 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 15:03:03,047 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 15:03:03,047 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:03:03,047 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 15:03:03,047 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 15:03:03,048 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 15:03:03,048 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 15:03:03,048 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:03:03,048 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:03:03,258 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:03:03,259 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 15:03:03,262 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:03:03 BoogieIcfgContainer [2020-08-21 15:03:03,263 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:03:03,264 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:03:03,264 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:03:03,267 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:03:03,268 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:03:02" (1/3) ... [2020-08-21 15:03:03,269 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6445789a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:03:03, skipping insertion in model container [2020-08-21 15:03:03,269 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:02" (2/3) ... [2020-08-21 15:03:03,269 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6445789a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:03:03, skipping insertion in model container [2020-08-21 15:03:03,270 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:03:03" (3/3) ... [2020-08-21 15:03:03,271 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-1.i [2020-08-21 15:03:03,282 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:03:03,288 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:03:03,299 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:03:03,319 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:03:03,319 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:03:03,319 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:03:03,319 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:03:03,319 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:03:03,319 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:03:03,320 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:03:03,320 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:03:03,336 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 15:03:03,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 15:03:03,341 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:03,342 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:03,342 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:03,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:03,347 INFO L82 PathProgramCache]: Analyzing trace with hash -413900697, now seen corresponding path program 1 times [2020-08-21 15:03:03,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:03,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82643695] [2020-08-21 15:03:03,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:03,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:03,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:03,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:03,548 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 15:03:03,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82643695] [2020-08-21 15:03:03,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:03:03,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 15:03:03,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055367839] [2020-08-21 15:03:03,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 15:03:03,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:03,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 15:03:03,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 15:03:03,591 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 15:03:03,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:03,711 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-21 15:03:03,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 15:03:03,713 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-21 15:03:03,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:03,722 INFO L225 Difference]: With dead ends: 42 [2020-08-21 15:03:03,723 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 15:03:03,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 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 15:03:03,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 15:03:03,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 15:03:03,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 15:03:03,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-21 15:03:03,760 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-08-21 15:03:03,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:03,760 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-21 15:03:03,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 15:03:03,760 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-21 15:03:03,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 15:03:03,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:03,761 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:03,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:03:03,762 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:03,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:03,763 INFO L82 PathProgramCache]: Analyzing trace with hash 2053026861, now seen corresponding path program 1 times [2020-08-21 15:03:03,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:03,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [718659560] [2020-08-21 15:03:03,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:03,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:03,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:03,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:03,844 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 15:03:03,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [718659560] [2020-08-21 15:03:03,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:03:03,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 15:03:03,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886428136] [2020-08-21 15:03:03,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:03:03,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:03,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:03:03,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:03:03,849 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2020-08-21 15:03:03,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:03,922 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-08-21 15:03:03,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 15:03:03,923 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2020-08-21 15:03:03,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:03,926 INFO L225 Difference]: With dead ends: 35 [2020-08-21 15:03:03,926 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 15:03:03,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 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 15:03:03,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 15:03:03,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-21 15:03:03,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 15:03:03,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-08-21 15:03:03,936 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2020-08-21 15:03:03,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:03,937 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-08-21 15:03:03,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:03:03,937 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-08-21 15:03:03,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 15:03:03,938 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:03,938 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:03,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:03:03,939 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:03,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:03,939 INFO L82 PathProgramCache]: Analyzing trace with hash 1766388751, now seen corresponding path program 1 times [2020-08-21 15:03:03,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:03,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [520049701] [2020-08-21 15:03:03,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:03,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:04,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:04,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:04,028 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 15:03:04,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [520049701] [2020-08-21 15:03:04,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:04,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 15:03:04,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071205179] [2020-08-21 15:03:04,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:03:04,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:04,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:03:04,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:03:04,031 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 5 states. [2020-08-21 15:03:04,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:04,117 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2020-08-21 15:03:04,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:03:04,118 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-08-21 15:03:04,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:04,119 INFO L225 Difference]: With dead ends: 45 [2020-08-21 15:03:04,119 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 15:03:04,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 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 15:03:04,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 15:03:04,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2020-08-21 15:03:04,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 15:03:04,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 15:03:04,127 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 16 [2020-08-21 15:03:04,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:04,128 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 15:03:04,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:03:04,128 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 15:03:04,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 15:03:04,130 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:04,130 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:04,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:03:04,131 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:04,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:04,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1185071985, now seen corresponding path program 2 times [2020-08-21 15:03:04,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:04,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1463900369] [2020-08-21 15:03:04,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:04,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:04,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:04,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:04,279 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 15:03:04,281 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1463900369] [2020-08-21 15:03:04,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:04,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 15:03:04,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198908401] [2020-08-21 15:03:04,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:03:04,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:04,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:03:04,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:03:04,284 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 15:03:04,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:04,370 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2020-08-21 15:03:04,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:03:04,371 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2020-08-21 15:03:04,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:04,372 INFO L225 Difference]: With dead ends: 56 [2020-08-21 15:03:04,372 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 15:03:04,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 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 15:03:04,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 15:03:04,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 34. [2020-08-21 15:03:04,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 15:03:04,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-08-21 15:03:04,381 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 18 [2020-08-21 15:03:04,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:04,382 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-08-21 15:03:04,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:03:04,382 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-08-21 15:03:04,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 15:03:04,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:04,383 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:04,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 15:03:04,384 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:04,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:04,384 INFO L82 PathProgramCache]: Analyzing trace with hash 885408339, now seen corresponding path program 3 times [2020-08-21 15:03:04,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:04,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1893447197] [2020-08-21 15:03:04,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:04,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:04,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:04,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:04,524 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 15:03:04,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1893447197] [2020-08-21 15:03:04,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:04,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:03:04,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981051658] [2020-08-21 15:03:04,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:03:04,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:04,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:03:04,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:03:04,527 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 7 states. [2020-08-21 15:03:04,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:04,626 INFO L93 Difference]: Finished difference Result 67 states and 79 transitions. [2020-08-21 15:03:04,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:03:04,626 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2020-08-21 15:03:04,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:04,627 INFO L225 Difference]: With dead ends: 67 [2020-08-21 15:03:04,628 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 15:03:04,628 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 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 15:03:04,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 15:03:04,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2020-08-21 15:03:04,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 15:03:04,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2020-08-21 15:03:04,636 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 20 [2020-08-21 15:03:04,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:04,637 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2020-08-21 15:03:04,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:03:04,637 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2020-08-21 15:03:04,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 15:03:04,638 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:04,638 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:04,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 15:03:04,639 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:04,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:04,639 INFO L82 PathProgramCache]: Analyzing trace with hash 671453365, now seen corresponding path program 4 times [2020-08-21 15:03:04,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:04,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1101500112] [2020-08-21 15:03:04,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:04,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:04,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:04,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:04,720 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-08-21 15:03:04,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1101500112] [2020-08-21 15:03:04,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:03:04,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 15:03:04,721 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059268239] [2020-08-21 15:03:04,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:03:04,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:04,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:03:04,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:03:04,722 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand 6 states. [2020-08-21 15:03:04,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:04,801 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2020-08-21 15:03:04,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:03:04,802 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 15:03:04,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:04,804 INFO L225 Difference]: With dead ends: 45 [2020-08-21 15:03:04,804 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 15:03:04,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:03:04,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 15:03:04,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 15:03:04,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 15:03:04,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2020-08-21 15:03:04,812 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 22 [2020-08-21 15:03:04,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:04,813 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2020-08-21 15:03:04,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:03:04,813 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2020-08-21 15:03:04,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 15:03:04,814 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:04,814 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:04,814 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 15:03:04,814 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:04,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:04,815 INFO L82 PathProgramCache]: Analyzing trace with hash 1732065724, now seen corresponding path program 1 times [2020-08-21 15:03:04,815 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:04,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1774165315] [2020-08-21 15:03:04,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:04,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:04,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:04,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:04,900 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 15:03:04,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1774165315] [2020-08-21 15:03:04,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:04,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 15:03:04,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442828827] [2020-08-21 15:03:04,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 15:03:04,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:04,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 15:03:04,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:03:04,902 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 8 states. [2020-08-21 15:03:04,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:04,993 INFO L93 Difference]: Finished difference Result 77 states and 89 transitions. [2020-08-21 15:03:04,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 15:03:04,994 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 15:03:04,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:04,995 INFO L225 Difference]: With dead ends: 77 [2020-08-21 15:03:04,995 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 15:03:04,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 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 15:03:04,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 15:03:05,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2020-08-21 15:03:05,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 15:03:05,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2020-08-21 15:03:05,003 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 26 [2020-08-21 15:03:05,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:05,003 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2020-08-21 15:03:05,003 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 15:03:05,003 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2020-08-21 15:03:05,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 15:03:05,004 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:05,004 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:05,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 15:03:05,005 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:05,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:05,005 INFO L82 PathProgramCache]: Analyzing trace with hash 359446174, now seen corresponding path program 2 times [2020-08-21 15:03:05,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:05,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [154825755] [2020-08-21 15:03:05,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:05,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:05,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:05,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:05,092 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 15:03:05,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [154825755] [2020-08-21 15:03:05,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:05,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 15:03:05,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286279073] [2020-08-21 15:03:05,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 15:03:05,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:05,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 15:03:05,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:03:05,094 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand 9 states. [2020-08-21 15:03:05,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:05,212 INFO L93 Difference]: Finished difference Result 88 states and 102 transitions. [2020-08-21 15:03:05,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 15:03:05,213 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 15:03:05,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:05,214 INFO L225 Difference]: With dead ends: 88 [2020-08-21 15:03:05,214 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 15:03:05,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 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 15:03:05,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 15:03:05,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 52. [2020-08-21 15:03:05,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 15:03:05,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2020-08-21 15:03:05,223 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 28 [2020-08-21 15:03:05,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:05,224 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2020-08-21 15:03:05,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 15:03:05,224 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2020-08-21 15:03:05,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 15:03:05,225 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:05,225 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:05,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 15:03:05,226 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:05,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:05,226 INFO L82 PathProgramCache]: Analyzing trace with hash -172981504, now seen corresponding path program 3 times [2020-08-21 15:03:05,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:05,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068775911] [2020-08-21 15:03:05,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:05,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:05,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:05,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:05,360 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 15:03:05,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068775911] [2020-08-21 15:03:05,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:05,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 15:03:05,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939005156] [2020-08-21 15:03:05,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 15:03:05,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:05,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 15:03:05,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:03:05,369 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand 10 states. [2020-08-21 15:03:05,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:05,504 INFO L93 Difference]: Finished difference Result 99 states and 115 transitions. [2020-08-21 15:03:05,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 15:03:05,504 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 15:03:05,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:05,506 INFO L225 Difference]: With dead ends: 99 [2020-08-21 15:03:05,506 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 15:03:05,509 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 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 15:03:05,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 15:03:05,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 58. [2020-08-21 15:03:05,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 15:03:05,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2020-08-21 15:03:05,520 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 30 [2020-08-21 15:03:05,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:05,522 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2020-08-21 15:03:05,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 15:03:05,523 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2020-08-21 15:03:05,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 15:03:05,524 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:05,524 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:05,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 15:03:05,527 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:05,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:05,527 INFO L82 PathProgramCache]: Analyzing trace with hash -734871838, now seen corresponding path program 4 times [2020-08-21 15:03:05,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:05,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249284644] [2020-08-21 15:03:05,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:05,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:05,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:05,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:05,679 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 15:03:05,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249284644] [2020-08-21 15:03:05,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:05,680 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 15:03:05,681 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728629657] [2020-08-21 15:03:05,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 15:03:05,681 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:05,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 15:03:05,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:03:05,682 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand 11 states. [2020-08-21 15:03:05,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:05,804 INFO L93 Difference]: Finished difference Result 110 states and 128 transitions. [2020-08-21 15:03:05,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 15:03:05,805 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 15:03:05,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:05,806 INFO L225 Difference]: With dead ends: 110 [2020-08-21 15:03:05,806 INFO L226 Difference]: Without dead ends: 73 [2020-08-21 15:03:05,807 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 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 15:03:05,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-21 15:03:05,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 64. [2020-08-21 15:03:05,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-21 15:03:05,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 73 transitions. [2020-08-21 15:03:05,814 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 73 transitions. Word has length 32 [2020-08-21 15:03:05,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:05,814 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 73 transitions. [2020-08-21 15:03:05,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 15:03:05,815 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 73 transitions. [2020-08-21 15:03:05,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 15:03:05,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:05,816 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:05,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 15:03:05,816 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:05,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:05,817 INFO L82 PathProgramCache]: Analyzing trace with hash 454396484, now seen corresponding path program 5 times [2020-08-21 15:03:05,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:05,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33371918] [2020-08-21 15:03:05,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:05,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:05,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:05,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:05,922 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 15:03:05,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33371918] [2020-08-21 15:03:05,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:05,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 15:03:05,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259835097] [2020-08-21 15:03:05,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 15:03:05,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:05,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 15:03:05,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:03:05,929 INFO L87 Difference]: Start difference. First operand 64 states and 73 transitions. Second operand 12 states. [2020-08-21 15:03:06,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:06,048 INFO L93 Difference]: Finished difference Result 121 states and 141 transitions. [2020-08-21 15:03:06,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 15:03:06,049 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 15:03:06,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:06,050 INFO L225 Difference]: With dead ends: 121 [2020-08-21 15:03:06,050 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 15:03:06,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 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 15:03:06,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 15:03:06,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 70. [2020-08-21 15:03:06,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-21 15:03:06,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 80 transitions. [2020-08-21 15:03:06,056 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 80 transitions. Word has length 34 [2020-08-21 15:03:06,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:06,057 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 80 transitions. [2020-08-21 15:03:06,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 15:03:06,057 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 80 transitions. [2020-08-21 15:03:06,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 15:03:06,058 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:06,058 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:06,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 15:03:06,059 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:06,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:06,059 INFO L82 PathProgramCache]: Analyzing trace with hash 879953190, now seen corresponding path program 6 times [2020-08-21 15:03:06,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:06,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [577466847] [2020-08-21 15:03:06,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:06,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:06,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:06,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:06,197 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 15:03:06,197 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [577466847] [2020-08-21 15:03:06,197 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:06,197 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 15:03:06,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927650782] [2020-08-21 15:03:06,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 15:03:06,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:06,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 15:03:06,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:03:06,200 INFO L87 Difference]: Start difference. First operand 70 states and 80 transitions. Second operand 13 states. [2020-08-21 15:03:06,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:06,354 INFO L93 Difference]: Finished difference Result 132 states and 154 transitions. [2020-08-21 15:03:06,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 15:03:06,355 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 15:03:06,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:06,356 INFO L225 Difference]: With dead ends: 132 [2020-08-21 15:03:06,357 INFO L226 Difference]: Without dead ends: 87 [2020-08-21 15:03:06,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:03:06,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-21 15:03:06,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 76. [2020-08-21 15:03:06,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-21 15:03:06,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 87 transitions. [2020-08-21 15:03:06,364 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 87 transitions. Word has length 36 [2020-08-21 15:03:06,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:06,364 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 87 transitions. [2020-08-21 15:03:06,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 15:03:06,364 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 87 transitions. [2020-08-21 15:03:06,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 15:03:06,365 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:06,365 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:06,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 15:03:06,366 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:06,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:06,366 INFO L82 PathProgramCache]: Analyzing trace with hash 1818054536, now seen corresponding path program 7 times [2020-08-21 15:03:06,367 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:06,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1522260512] [2020-08-21 15:03:06,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:06,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:06,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:06,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:06,497 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 15:03:06,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1522260512] [2020-08-21 15:03:06,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:06,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 15:03:06,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095939707] [2020-08-21 15:03:06,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 15:03:06,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:06,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 15:03:06,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:03:06,500 INFO L87 Difference]: Start difference. First operand 76 states and 87 transitions. Second operand 14 states. [2020-08-21 15:03:06,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:06,646 INFO L93 Difference]: Finished difference Result 143 states and 167 transitions. [2020-08-21 15:03:06,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 15:03:06,647 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-08-21 15:03:06,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:06,648 INFO L225 Difference]: With dead ends: 143 [2020-08-21 15:03:06,648 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 15:03:06,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 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 15:03:06,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 15:03:06,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 82. [2020-08-21 15:03:06,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-21 15:03:06,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 94 transitions. [2020-08-21 15:03:06,655 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 94 transitions. Word has length 38 [2020-08-21 15:03:06,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:06,655 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 94 transitions. [2020-08-21 15:03:06,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 15:03:06,655 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 94 transitions. [2020-08-21 15:03:06,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 15:03:06,656 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:06,657 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:06,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 15:03:06,657 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:06,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:06,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1390315882, now seen corresponding path program 8 times [2020-08-21 15:03:06,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:06,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1082251904] [2020-08-21 15:03:06,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:06,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:06,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:06,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:06,796 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 15:03:06,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1082251904] [2020-08-21 15:03:06,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:06,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 15:03:06,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123787598] [2020-08-21 15:03:06,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 15:03:06,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:06,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 15:03:06,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:03:06,798 INFO L87 Difference]: Start difference. First operand 82 states and 94 transitions. Second operand 15 states. [2020-08-21 15:03:06,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:06,992 INFO L93 Difference]: Finished difference Result 154 states and 180 transitions. [2020-08-21 15:03:06,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 15:03:06,992 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2020-08-21 15:03:06,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:06,993 INFO L225 Difference]: With dead ends: 154 [2020-08-21 15:03:06,994 INFO L226 Difference]: Without dead ends: 101 [2020-08-21 15:03:06,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 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 15:03:06,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-08-21 15:03:06,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 88. [2020-08-21 15:03:06,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-21 15:03:07,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 101 transitions. [2020-08-21 15:03:07,000 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 101 transitions. Word has length 40 [2020-08-21 15:03:07,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:07,001 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 101 transitions. [2020-08-21 15:03:07,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 15:03:07,001 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 101 transitions. [2020-08-21 15:03:07,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 15:03:07,002 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:07,002 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:07,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 15:03:07,003 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:07,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:07,003 INFO L82 PathProgramCache]: Analyzing trace with hash -1644637492, now seen corresponding path program 9 times [2020-08-21 15:03:07,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:07,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1023993934] [2020-08-21 15:03:07,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:07,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:07,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:07,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:07,070 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-08-21 15:03:07,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1023993934] [2020-08-21 15:03:07,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:07,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:03:07,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038239004] [2020-08-21 15:03:07,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:03:07,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:07,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:03:07,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:03:07,073 INFO L87 Difference]: Start difference. First operand 88 states and 101 transitions. Second operand 7 states. [2020-08-21 15:03:07,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:07,151 INFO L93 Difference]: Finished difference Result 93 states and 105 transitions. [2020-08-21 15:03:07,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:03:07,151 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 42 [2020-08-21 15:03:07,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:07,152 INFO L225 Difference]: With dead ends: 93 [2020-08-21 15:03:07,153 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 15:03:07,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:03:07,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 15:03:07,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-21 15:03:07,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-21 15:03:07,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 100 transitions. [2020-08-21 15:03:07,159 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 100 transitions. Word has length 42 [2020-08-21 15:03:07,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:07,159 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 100 transitions. [2020-08-21 15:03:07,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:03:07,159 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 100 transitions. [2020-08-21 15:03:07,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 15:03:07,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:07,161 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:07,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 15:03:07,161 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:07,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:07,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1325635667, now seen corresponding path program 10 times [2020-08-21 15:03:07,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:07,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [904166017] [2020-08-21 15:03:07,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:07,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:07,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:07,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:07,224 INFO L134 CoverageAnalysis]: Checked inductivity of 152 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2020-08-21 15:03:07,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [904166017] [2020-08-21 15:03:07,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:03:07,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-21 15:03:07,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610536033] [2020-08-21 15:03:07,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:03:07,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:07,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:03:07,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:03:07,226 INFO L87 Difference]: Start difference. First operand 88 states and 100 transitions. Second operand 7 states. [2020-08-21 15:03:07,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:07,295 INFO L93 Difference]: Finished difference Result 88 states and 100 transitions. [2020-08-21 15:03:07,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:03:07,295 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 46 [2020-08-21 15:03:07,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:07,296 INFO L225 Difference]: With dead ends: 88 [2020-08-21 15:03:07,296 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 15:03:07,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:03:07,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 15:03:07,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 15:03:07,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 15:03:07,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 15:03:07,298 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 46 [2020-08-21 15:03:07,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:07,298 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 15:03:07,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:03:07,298 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 15:03:07,299 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 15:03:07,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 15:03:07,301 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 15:03:07,361 INFO L268 CegarLoopResult]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2020-08-21 15:03:07,361 INFO L264 CegarLoopResult]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#NULL.base| |old(#NULL.base)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2020-08-21 15:03:07,361 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 15:03:07,361 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 15:03:07,362 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 15:03:07,362 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 15:03:07,362 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 15:03:07,362 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 9 23) no Hoare annotation was computed. [2020-08-21 15:03:07,362 INFO L268 CegarLoopResult]: For program point L17-1(lines 17 21) no Hoare annotation was computed. [2020-08-21 15:03:07,362 INFO L268 CegarLoopResult]: For program point L17-3(lines 17 21) no Hoare annotation was computed. [2020-08-21 15:03:07,362 INFO L264 CegarLoopResult]: At program point L17-4(lines 17 21) the Hoare annotation is: (<= main_~i~0 1023) [2020-08-21 15:03:07,363 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 9 23) no Hoare annotation was computed. [2020-08-21 15:03:07,363 INFO L264 CegarLoopResult]: At program point L17-5(lines 17 21) the Hoare annotation is: (<= main_~i~0 1023) [2020-08-21 15:03:07,363 INFO L268 CegarLoopResult]: For program point L13-2(lines 13 15) no Hoare annotation was computed. [2020-08-21 15:03:07,363 INFO L271 CegarLoopResult]: At program point L13-3(lines 13 15) the Hoare annotation is: true [2020-08-21 15:03:07,363 INFO L268 CegarLoopResult]: For program point L13-4(lines 13 15) no Hoare annotation was computed. [2020-08-21 15:03:07,363 INFO L264 CegarLoopResult]: At program point mainENTRY(lines 9 23) the Hoare annotation is: (= |old(#valid)| |#valid|) [2020-08-21 15:03:07,363 INFO L268 CegarLoopResult]: For program point L22(line 22) no Hoare annotation was computed. [2020-08-21 15:03:07,363 INFO L268 CegarLoopResult]: For program point L18(lines 18 20) no Hoare annotation was computed. [2020-08-21 15:03:07,364 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2020-08-21 15:03:07,364 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2020-08-21 15:03:07,364 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-08-21 15:03:07,364 INFO L268 CegarLoopResult]: For program point L4(lines 4 6) no Hoare annotation was computed. [2020-08-21 15:03:07,364 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2020-08-21 15:03:07,364 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2020-08-21 15:03:07,382 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 03:03:07 BoogieIcfgContainer [2020-08-21 15:03:07,382 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 15:03:07,385 INFO L168 Benchmark]: Toolchain (without parser) took 4901.39 ms. Allocated memory was 141.6 MB in the beginning and 273.7 MB in the end (delta: 132.1 MB). Free memory was 105.3 MB in the beginning and 181.7 MB in the end (delta: -76.4 MB). Peak memory consumption was 55.7 MB. Max. memory is 7.1 GB. [2020-08-21 15:03:07,386 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 141.6 MB. Free memory was 123.1 MB in the beginning and 122.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 15:03:07,386 INFO L168 Benchmark]: CACSL2BoogieTranslator took 364.10 ms. Allocated memory is still 141.6 MB. Free memory was 105.1 MB in the beginning and 95.2 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-08-21 15:03:07,387 INFO L168 Benchmark]: Boogie Preprocessor took 130.70 ms. Allocated memory was 141.6 MB in the beginning and 205.0 MB in the end (delta: 63.4 MB). Free memory was 95.2 MB in the beginning and 183.1 MB in the end (delta: -87.9 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-08-21 15:03:07,388 INFO L168 Benchmark]: RCFGBuilder took 283.92 ms. Allocated memory is still 205.0 MB. Free memory was 182.5 MB in the beginning and 168.6 MB in the end (delta: 13.9 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-08-21 15:03:07,389 INFO L168 Benchmark]: TraceAbstraction took 4118.13 ms. Allocated memory was 205.0 MB in the beginning and 273.7 MB in the end (delta: 68.7 MB). Free memory was 168.6 MB in the beginning and 181.7 MB in the end (delta: -13.1 MB). Peak memory consumption was 55.6 MB. Max. memory is 7.1 GB. [2020-08-21 15:03:07,393 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 141.6 MB. Free memory was 123.1 MB in the beginning and 122.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 364.10 ms. Allocated memory is still 141.6 MB. Free memory was 105.1 MB in the beginning and 95.2 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 130.70 ms. Allocated memory was 141.6 MB in the beginning and 205.0 MB in the end (delta: 63.4 MB). Free memory was 95.2 MB in the beginning and 183.1 MB in the end (delta: -87.9 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 283.92 ms. Allocated memory is still 205.0 MB. Free memory was 182.5 MB in the beginning and 168.6 MB in the end (delta: 13.9 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4118.13 ms. Allocated memory was 205.0 MB in the beginning and 273.7 MB in the end (delta: 68.7 MB). Free memory was 168.6 MB in the beginning and 181.7 MB in the end (delta: -13.1 MB). Peak memory consumption was 55.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 17]: Loop Invariant Derived loop invariant: i <= 1023 - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 3.9s, OverallIterations: 16, TraceHistogramMax: 12, AutomataDifference: 1.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 214 SDtfs, 505 SDslu, 593 SDs, 0 SdLazy, 1177 SolverSat, 232 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 159 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=88occurred in iteration=14, 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, 16 MinimizatonAttempts, 94 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 23 PreInvPairs, 51 NumberOfFragments, 23 HoareAnnotationTreeSize, 23 FomulaSimplifications, 77 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 8 FomulaSimplificationsInter, 39 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 455 NumberOfCodeBlocks, 455 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 439 ConstructedInterpolants, 0 QuantifiedInterpolants, 28428 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 16 InterpolantComputations, 4 PerfectInterpolantSequences, 328/836 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...