/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 22:02:09,432 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:02:09,435 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:02:09,458 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 22:02:09,459 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 22:02:09,460 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 22:02:09,461 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 22:02:09,463 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 22:02:09,465 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 22:02:09,466 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 22:02:09,467 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 22:02:09,468 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 22:02:09,468 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 22:02:09,469 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 22:02:09,471 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 22:02:09,472 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 22:02:09,472 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 22:02:09,473 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 22:02:09,475 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 22:02:09,477 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 22:02:09,479 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 22:02:09,480 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 22:02:09,481 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 22:02:09,482 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 22:02:09,484 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 22:02:09,495 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:02:09,496 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:02:09,497 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:02:09,498 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 [2020-08-18 22:02:09,547 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:02:09,547 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:02:09,552 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:02:09,552 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:02:09,552 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:02:09,553 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:02:09,553 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:02:09,553 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:02:09,553 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:02:09,553 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:02:09,554 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:02:09,554 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:02:09,554 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:02:09,554 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:02:09,554 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:02:09,555 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:02:09,557 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:02:09,557 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:02:09,557 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:02:09,557 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:02:09,558 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:02:09,558 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:02:09,558 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:02:09,559 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:02:09,559 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:02:09,559 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:02:09,559 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:02:09,559 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:02:09,560 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:02:09,560 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; [2020-08-18 22:02:09,905 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:02:09,925 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:02:09,931 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:02:09,933 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:02:09,935 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:02:09,936 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-18 22:02:10,013 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/827413acf/b61db06d5b804334bbcc967e7979924f/FLAGc5aec2170 [2020-08-18 22:02:10,477 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:02:10,478 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-18 22:02:10,485 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/827413acf/b61db06d5b804334bbcc967e7979924f/FLAGc5aec2170 [2020-08-18 22:02:10,839 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/827413acf/b61db06d5b804334bbcc967e7979924f [2020-08-18 22:02:10,849 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:02:10,851 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:02:10,852 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:02:10,852 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:02:10,856 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:02:10,857 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:02:10" (1/1) ... [2020-08-18 22:02:10,860 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7405de93 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:10, skipping insertion in model container [2020-08-18 22:02:10,860 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:02:10" (1/1) ... [2020-08-18 22:02:10,869 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:02:10,891 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:02:11,115 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:02:11,120 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:02:11,144 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:02:11,164 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:02:11,164 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:11 WrapperNode [2020-08-18 22:02:11,164 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:02:11,165 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:02:11,165 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:02:11,165 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:02:11,252 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:11" (1/1) ... [2020-08-18 22:02:11,252 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:11" (1/1) ... [2020-08-18 22:02:11,259 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:11" (1/1) ... [2020-08-18 22:02:11,260 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:11" (1/1) ... [2020-08-18 22:02:11,271 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:11" (1/1) ... [2020-08-18 22:02:11,277 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:11" (1/1) ... [2020-08-18 22:02:11,278 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:11" (1/1) ... [2020-08-18 22:02:11,280 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:02:11,281 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:02:11,281 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:02:11,281 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:02:11,282 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:11" (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 [2020-08-18 22:02:11,337 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:02:11,337 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:02:11,338 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 22:02:11,338 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:02:11,338 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:02:11,338 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 22:02:11,338 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 22:02:11,339 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 22:02:11,339 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-18 22:02:11,339 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:02:11,339 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 22:02:11,339 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 22:02:11,340 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 22:02:11,340 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 22:02:11,340 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:02:11,340 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:02:11,651 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:02:11,652 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 22:02:11,656 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:02:11 BoogieIcfgContainer [2020-08-18 22:02:11,656 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:02:11,657 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:02:11,658 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:02:11,661 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:02:11,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:02:10" (1/3) ... [2020-08-18 22:02:11,662 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@424e4c21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:02:11, skipping insertion in model container [2020-08-18 22:02:11,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:11" (2/3) ... [2020-08-18 22:02:11,663 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@424e4c21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:02:11, skipping insertion in model container [2020-08-18 22:02:11,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:02:11" (3/3) ... [2020-08-18 22:02:11,665 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-18 22:02:11,676 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:02:11,683 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:02:11,697 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:02:11,721 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:02:11,721 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:02:11,721 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:02:11,721 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:02:11,722 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:02:11,722 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:02:11,722 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:02:11,722 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:02:11,739 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-08-18 22:02:11,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 22:02:11,744 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:11,745 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:11,745 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:11,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:11,750 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-08-18 22:02:11,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:11,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [240363472] [2020-08-18 22:02:11,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:11,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:11,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:11,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:11,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:11,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [240363472] [2020-08-18 22:02:11,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:02:11,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 22:02:11,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062111404] [2020-08-18 22:02:11,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 22:02:11,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:11,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 22:02:11,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:02:11,957 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-08-18 22:02:12,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:12,059 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-08-18 22:02:12,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 22:02:12,061 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-18 22:02:12,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:12,070 INFO L225 Difference]: With dead ends: 51 [2020-08-18 22:02:12,070 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 22:02:12,074 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 [2020-08-18 22:02:12,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 22:02:12,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 22:02:12,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 22:02:12,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-18 22:02:12,109 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-08-18 22:02:12,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:12,110 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-18 22:02:12,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 22:02:12,110 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-18 22:02:12,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 22:02:12,111 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:12,112 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:12,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:02:12,112 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:12,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:12,113 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-08-18 22:02:12,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:12,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1690825318] [2020-08-18 22:02:12,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:12,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:12,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,239 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:12,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1690825318] [2020-08-18 22:02:12,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:02:12,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 22:02:12,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161235309] [2020-08-18 22:02:12,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:02:12,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:12,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:02:12,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:02:12,248 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-08-18 22:02:12,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:12,371 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-08-18 22:02:12,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 22:02:12,372 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-18 22:02:12,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:12,375 INFO L225 Difference]: With dead ends: 44 [2020-08-18 22:02:12,376 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 22:02:12,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:02:12,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 22:02:12,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-08-18 22:02:12,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 22:02:12,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-08-18 22:02:12,389 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-08-18 22:02:12,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:12,390 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-08-18 22:02:12,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:02:12,390 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-08-18 22:02:12,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 22:02:12,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:12,392 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:12,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:02:12,392 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:12,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:12,393 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-08-18 22:02:12,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:12,394 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [939651570] [2020-08-18 22:02:12,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:12,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:12,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,511 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 22:02:12,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [939651570] [2020-08-18 22:02:12,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:02:12,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 22:02:12,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263422433] [2020-08-18 22:02:12,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:02:12,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:12,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:02:12,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:02:12,522 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-08-18 22:02:12,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:12,668 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-18 22:02:12,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 22:02:12,668 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-18 22:02:12,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:12,671 INFO L225 Difference]: With dead ends: 37 [2020-08-18 22:02:12,671 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 22:02:12,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:02:12,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 22:02:12,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 22:02:12,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 22:02:12,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-18 22:02:12,688 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-08-18 22:02:12,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:12,689 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-18 22:02:12,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:02:12,690 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-18 22:02:12,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 22:02:12,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:12,691 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:12,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:02:12,692 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:12,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:12,694 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-08-18 22:02:12,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:12,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249921539] [2020-08-18 22:02:12,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:12,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:13,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:13,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:13,202 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:13,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249921539] [2020-08-18 22:02:13,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:13,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 22:02:13,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992671112] [2020-08-18 22:02:13,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:02:13,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:13,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:02:13,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:02:13,208 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 13 states. [2020-08-18 22:02:13,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:13,773 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-18 22:02:13,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 22:02:13,774 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-08-18 22:02:13,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:13,776 INFO L225 Difference]: With dead ends: 50 [2020-08-18 22:02:13,777 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 22:02:13,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:02:13,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 22:02:13,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2020-08-18 22:02:13,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 22:02:13,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 22:02:13,799 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-08-18 22:02:13,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:13,799 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 22:02:13,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:02:13,801 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 22:02:13,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 22:02:13,802 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:13,803 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:13,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:02:13,804 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:13,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:13,804 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-08-18 22:02:13,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:13,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [839432764] [2020-08-18 22:02:13,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:13,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:13,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:13,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:13,943 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:13,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [839432764] [2020-08-18 22:02:13,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:13,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 22:02:13,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768471991] [2020-08-18 22:02:13,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 22:02:13,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:13,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 22:02:13,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:02:13,948 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-08-18 22:02:14,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:14,147 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-08-18 22:02:14,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 22:02:14,148 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-18 22:02:14,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:14,149 INFO L225 Difference]: With dead ends: 59 [2020-08-18 22:02:14,149 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 22:02:14,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:02:14,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 22:02:14,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-08-18 22:02:14,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 22:02:14,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 22:02:14,159 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-08-18 22:02:14,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:14,160 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 22:02:14,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 22:02:14,160 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 22:02:14,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 22:02:14,161 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:14,161 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:14,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:02:14,162 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:14,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:14,163 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-08-18 22:02:14,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:14,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2121013363] [2020-08-18 22:02:14,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:14,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:14,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:14,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:14,562 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:14,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2121013363] [2020-08-18 22:02:14,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:14,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 22:02:14,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289465748] [2020-08-18 22:02:14,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 22:02:14,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:14,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 22:02:14,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:02:14,565 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 15 states. [2020-08-18 22:02:15,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:15,488 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-08-18 22:02:15,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 22:02:15,488 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-08-18 22:02:15,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:15,493 INFO L225 Difference]: With dead ends: 70 [2020-08-18 22:02:15,493 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 22:02:15,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:02:15,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 22:02:15,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-08-18 22:02:15,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 22:02:15,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-18 22:02:15,519 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-08-18 22:02:15,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:15,519 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-18 22:02:15,519 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 22:02:15,520 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-18 22:02:15,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 22:02:15,520 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:15,522 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:15,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 22:02:15,522 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:15,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:15,523 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-08-18 22:02:15,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:15,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [96577032] [2020-08-18 22:02:15,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:15,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:15,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:15,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:15,630 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:15,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [96577032] [2020-08-18 22:02:15,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:15,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 22:02:15,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30402626] [2020-08-18 22:02:15,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 22:02:15,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:15,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 22:02:15,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:02:15,633 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-18 22:02:15,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:15,856 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-08-18 22:02:15,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 22:02:15,856 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-18 22:02:15,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:15,858 INFO L225 Difference]: With dead ends: 74 [2020-08-18 22:02:15,859 INFO L226 Difference]: Without dead ends: 63 [2020-08-18 22:02:15,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:02:15,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-18 22:02:15,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-08-18 22:02:15,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 22:02:15,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-18 22:02:15,870 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-08-18 22:02:15,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:15,870 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-18 22:02:15,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 22:02:15,870 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-18 22:02:15,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 22:02:15,871 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:15,872 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:15,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 22:02:15,872 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:15,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:15,873 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-08-18 22:02:15,873 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:15,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105716958] [2020-08-18 22:02:15,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:15,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:15,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:15,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:15,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 22:02:15,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:15,942 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 22:02:15,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105716958] [2020-08-18 22:02:15,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:15,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 22:02:15,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874528951] [2020-08-18 22:02:15,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 22:02:15,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:15,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 22:02:15,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:02:15,945 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-08-18 22:02:16,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:16,096 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-08-18 22:02:16,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 22:02:16,097 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-08-18 22:02:16,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:16,098 INFO L225 Difference]: With dead ends: 75 [2020-08-18 22:02:16,099 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 22:02:16,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:02:16,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 22:02:16,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-08-18 22:02:16,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 22:02:16,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-08-18 22:02:16,115 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-08-18 22:02:16,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:16,115 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-08-18 22:02:16,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 22:02:16,115 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-08-18 22:02:16,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 22:02:16,116 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:16,117 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:16,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 22:02:16,117 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:16,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:16,118 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-08-18 22:02:16,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:16,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554035513] [2020-08-18 22:02:16,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:16,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:16,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:16,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:16,500 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:16,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554035513] [2020-08-18 22:02:16,501 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:16,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 22:02:16,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876661772] [2020-08-18 22:02:16,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 22:02:16,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:16,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 22:02:16,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:02:16,503 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2020-08-18 22:02:18,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:18,088 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2020-08-18 22:02:18,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 22:02:18,089 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-08-18 22:02:18,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:18,090 INFO L225 Difference]: With dead ends: 97 [2020-08-18 22:02:18,091 INFO L226 Difference]: Without dead ends: 95 [2020-08-18 22:02:18,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 22:02:18,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-18 22:02:18,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2020-08-18 22:02:18,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 22:02:18,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-08-18 22:02:18,112 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-08-18 22:02:18,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:18,113 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-08-18 22:02:18,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 22:02:18,113 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-08-18 22:02:18,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 22:02:18,118 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:18,118 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:18,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 22:02:18,118 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:18,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:18,120 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-08-18 22:02:18,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:18,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [614625265] [2020-08-18 22:02:18,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:18,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:18,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:18,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:18,214 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:18,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [614625265] [2020-08-18 22:02:18,215 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:18,215 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 22:02:18,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297136455] [2020-08-18 22:02:18,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 22:02:18,216 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:18,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 22:02:18,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:02:18,217 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-08-18 22:02:18,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:18,462 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-08-18 22:02:18,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 22:02:18,463 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-18 22:02:18,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:18,465 INFO L225 Difference]: With dead ends: 88 [2020-08-18 22:02:18,465 INFO L226 Difference]: Without dead ends: 77 [2020-08-18 22:02:18,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:02:18,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-18 22:02:18,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-08-18 22:02:18,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 22:02:18,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-08-18 22:02:18,476 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-08-18 22:02:18,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:18,477 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-08-18 22:02:18,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 22:02:18,477 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-08-18 22:02:18,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 22:02:18,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:18,479 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:18,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 22:02:18,479 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:18,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:18,480 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-08-18 22:02:18,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:18,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515890296] [2020-08-18 22:02:18,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:18,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 22:02:18,502 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 22:02:18,502 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 22:02:18,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 22:02:18,526 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 10:02:18 BoogieIcfgContainer [2020-08-18 22:02:18,526 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 22:02:18,529 INFO L168 Benchmark]: Toolchain (without parser) took 7677.07 ms. Allocated memory was 140.5 MB in the beginning and 296.2 MB in the end (delta: 155.7 MB). Free memory was 103.6 MB in the beginning and 187.2 MB in the end (delta: -83.7 MB). Peak memory consumption was 72.1 MB. Max. memory is 7.1 GB. [2020-08-18 22:02:18,530 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 22:02:18,531 INFO L168 Benchmark]: CACSL2BoogieTranslator took 313.00 ms. Allocated memory is still 140.5 MB. Free memory was 103.4 MB in the beginning and 93.1 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-08-18 22:02:18,532 INFO L168 Benchmark]: Boogie Preprocessor took 115.36 ms. Allocated memory was 140.5 MB in the beginning and 202.4 MB in the end (delta: 61.9 MB). Free memory was 93.1 MB in the beginning and 179.9 MB in the end (delta: -86.8 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-08-18 22:02:18,532 INFO L168 Benchmark]: RCFGBuilder took 375.19 ms. Allocated memory is still 202.4 MB. Free memory was 179.9 MB in the beginning and 163.6 MB in the end (delta: 16.3 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. [2020-08-18 22:02:18,533 INFO L168 Benchmark]: TraceAbstraction took 6868.96 ms. Allocated memory was 202.4 MB in the beginning and 296.2 MB in the end (delta: 93.8 MB). Free memory was 162.9 MB in the beginning and 187.2 MB in the end (delta: -24.3 MB). Peak memory consumption was 69.5 MB. Max. memory is 7.1 GB. [2020-08-18 22:02:18,537 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 313.00 ms. Allocated memory is still 140.5 MB. Free memory was 103.4 MB in the beginning and 93.1 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 115.36 ms. Allocated memory was 140.5 MB in the beginning and 202.4 MB in the end (delta: 61.9 MB). Free memory was 93.1 MB in the beginning and 179.9 MB in the end (delta: -86.8 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 375.19 ms. Allocated memory is still 202.4 MB. Free memory was 179.9 MB in the beginning and 163.6 MB in the end (delta: 16.3 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6868.96 ms. Allocated memory was 202.4 MB in the beginning and 296.2 MB in the end (delta: 93.8 MB). Free memory was 162.9 MB in the beginning and 187.2 MB in the end (delta: -24.3 MB). Peak memory consumption was 69.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L15] COND FALSE !(!(MAX > 0)) [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i