/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 22:17:54,709 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 22:17:54,712 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 22:17:54,743 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 22:17:54,743 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 22:17:54,744 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 22:17:54,746 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 22:17:54,747 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 22:17:54,749 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 22:17:54,750 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 22:17:54,751 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 22:17:54,752 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 22:17:54,752 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 22:17:54,753 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 22:17:54,755 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 22:17:54,756 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 22:17:54,757 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 22:17:54,758 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 22:17:54,759 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 22:17:54,761 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 22:17:54,763 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 22:17:54,764 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 22:17:54,765 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 22:17:54,766 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 22:17:54,768 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 22:17:54,768 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 22:17:54,768 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 22:17:54,769 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 22:17:54,770 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 22:17:54,771 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 22:17:54,775 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 22:17:54,776 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 22:17:54,777 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 22:17:54,778 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 22:17:54,815 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 22:17:54,815 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 22:17:54,817 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 22:17:54,817 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 22:17:54,817 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 22:17:54,817 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 22:17:54,818 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 22:17:54,818 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 22:17:54,818 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 22:17:54,818 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 22:17:54,818 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 22:17:54,818 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 22:17:54,819 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 22:17:54,819 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 22:17:54,819 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 22:17:54,819 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 22:17:54,819 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 22:17:54,820 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 22:17:54,820 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 22:17:54,820 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 22:17:54,820 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 22:17:54,821 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 22:17:54,821 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 22:17:54,821 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 22:17:54,821 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 22:17:54,821 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 22:17:54,821 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 22:17:54,822 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 22:17:54,822 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 22:17:54,822 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; [2020-08-21 22:17:55,158 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 22:17:55,174 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 22:17:55,178 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 22:17:55,180 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 22:17:55,180 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 22:17:55,181 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-21 22:17:55,263 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f830a87cd/c8e2f6469d2e4cc9ab9d2255b0f02e40/FLAG2ac9aea12 [2020-08-21 22:17:55,789 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 22:17:55,790 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-21 22:17:55,797 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f830a87cd/c8e2f6469d2e4cc9ab9d2255b0f02e40/FLAG2ac9aea12 [2020-08-21 22:17:56,118 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f830a87cd/c8e2f6469d2e4cc9ab9d2255b0f02e40 [2020-08-21 22:17:56,129 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 22:17:56,131 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 22:17:56,132 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 22:17:56,132 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 22:17:56,136 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 22:17:56,137 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,142 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@41d8353a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56, skipping insertion in model container [2020-08-21 22:17:56,143 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,152 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 22:17:56,176 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 22:17:56,390 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:17:56,395 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 22:17:56,417 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:17:56,436 INFO L208 MainTranslator]: Completed translation [2020-08-21 22:17:56,437 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56 WrapperNode [2020-08-21 22:17:56,437 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 22:17:56,438 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 22:17:56,438 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 22:17:56,438 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 22:17:56,530 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,530 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,540 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,540 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,548 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,553 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,555 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,557 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 22:17:56,558 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 22:17:56,558 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 22:17:56,558 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 22:17:56,560 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (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 22:17:56,627 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 22:17:56,627 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 22:17:56,627 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 22:17:56,628 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 22:17:56,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 22:17:56,628 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 22:17:56,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 22:17:56,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 22:17:56,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-21 22:17:56,629 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 22:17:56,629 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 22:17:56,629 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 22:17:56,629 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 22:17:56,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 22:17:56,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 22:17:56,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 22:17:56,942 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 22:17:56,942 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 22:17:56,946 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:17:56 BoogieIcfgContainer [2020-08-21 22:17:56,946 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 22:17:56,947 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 22:17:56,947 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 22:17:56,950 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 22:17:56,950 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 10:17:56" (1/3) ... [2020-08-21 22:17:56,951 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f2fd8ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:17:56, skipping insertion in model container [2020-08-21 22:17:56,951 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (2/3) ... [2020-08-21 22:17:56,952 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f2fd8ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:17:56, skipping insertion in model container [2020-08-21 22:17:56,952 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:17:56" (3/3) ... [2020-08-21 22:17:56,953 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-21 22:17:56,964 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 22:17:56,971 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 22:17:56,985 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 22:17:57,005 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 22:17:57,005 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 22:17:57,005 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 22:17:57,005 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 22:17:57,005 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 22:17:57,005 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 22:17:57,006 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 22:17:57,006 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 22:17:57,023 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-08-21 22:17:57,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 22:17:57,028 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:57,029 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:57,029 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:57,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:57,034 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-08-21 22:17:57,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:57,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [117402994] [2020-08-21 22:17:57,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:57,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:57,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,259 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 22:17:57,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [117402994] [2020-08-21 22:17:57,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:17:57,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 22:17:57,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998887251] [2020-08-21 22:17:57,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 22:17:57,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:57,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 22:17:57,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 22:17:57,287 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-08-21 22:17:57,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:57,382 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-08-21 22:17:57,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 22:17:57,384 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 22:17:57,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:57,394 INFO L225 Difference]: With dead ends: 51 [2020-08-21 22:17:57,395 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 22:17:57,399 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 22:17:57,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 22:17:57,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 22:17:57,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 22:17:57,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 22:17:57,441 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-08-21 22:17:57,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:57,442 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 22:17:57,442 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 22:17:57,442 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 22:17:57,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 22:17:57,443 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:57,443 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:57,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 22:17:57,444 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:57,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:57,445 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-08-21 22:17:57,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:57,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224039824] [2020-08-21 22:17:57,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:57,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:57,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,560 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 22:17:57,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224039824] [2020-08-21 22:17:57,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:17:57,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 22:17:57,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652919295] [2020-08-21 22:17:57,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 22:17:57,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:57,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 22:17:57,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:17:57,565 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-08-21 22:17:57,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:57,673 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-08-21 22:17:57,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 22:17:57,674 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-21 22:17:57,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:57,677 INFO L225 Difference]: With dead ends: 44 [2020-08-21 22:17:57,677 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 22:17:57,679 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 [2020-08-21 22:17:57,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 22:17:57,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-08-21 22:17:57,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 22:17:57,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-08-21 22:17:57,691 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-08-21 22:17:57,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:57,691 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-08-21 22:17:57,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 22:17:57,692 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-08-21 22:17:57,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 22:17:57,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:57,693 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:57,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 22:17:57,693 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:57,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:57,694 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-08-21 22:17:57,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:57,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1719014820] [2020-08-21 22:17:57,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:57,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:57,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 22:17:57,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1719014820] [2020-08-21 22:17:57,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:17:57,816 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 22:17:57,816 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877452788] [2020-08-21 22:17:57,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 22:17:57,817 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:57,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 22:17:57,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:17:57,818 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-08-21 22:17:57,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:57,941 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-21 22:17:57,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 22:17:57,942 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-21 22:17:57,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:57,943 INFO L225 Difference]: With dead ends: 37 [2020-08-21 22:17:57,944 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 22:17:57,945 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 [2020-08-21 22:17:57,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 22:17:57,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 22:17:57,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 22:17:57,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-21 22:17:57,952 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-08-21 22:17:57,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:57,953 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-21 22:17:57,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 22:17:57,953 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-21 22:17:57,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 22:17:57,954 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:57,955 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] [2020-08-21 22:17:57,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 22:17:57,955 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:57,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:57,956 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-08-21 22:17:57,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:57,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2081853003] [2020-08-21 22:17:57,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:57,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:58,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:58,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:58,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:58,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2081853003] [2020-08-21 22:17:58,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:17:58,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 22:17:58,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703684025] [2020-08-21 22:17:58,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 22:17:58,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:58,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 22:17:58,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:17:58,483 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 13 states. [2020-08-21 22:17:59,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:59,020 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-21 22:17:59,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 22:17:59,021 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-08-21 22:17:59,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:59,022 INFO L225 Difference]: With dead ends: 50 [2020-08-21 22:17:59,023 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 22:17:59,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2020-08-21 22:17:59,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 22:17:59,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2020-08-21 22:17:59,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 22:17:59,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 22:17:59,036 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-08-21 22:17:59,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:59,037 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 22:17:59,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 22:17:59,037 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 22:17:59,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 22:17:59,039 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:59,039 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] [2020-08-21 22:17:59,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 22:17:59,040 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:59,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:59,040 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-08-21 22:17:59,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:59,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2001323154] [2020-08-21 22:17:59,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:59,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:59,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:59,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:59,144 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:59,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2001323154] [2020-08-21 22:17:59,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:17:59,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 22:17:59,149 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063522860] [2020-08-21 22:17:59,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 22:17:59,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:59,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 22:17:59,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:17:59,153 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-08-21 22:17:59,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:59,373 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-08-21 22:17:59,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 22:17:59,374 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-21 22:17:59,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:59,375 INFO L225 Difference]: With dead ends: 59 [2020-08-21 22:17:59,376 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 22:17:59,376 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 [2020-08-21 22:17:59,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 22:17:59,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-08-21 22:17:59,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 22:17:59,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 22:17:59,385 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-08-21 22:17:59,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:59,386 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 22:17:59,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 22:17:59,386 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 22:17:59,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 22:17:59,387 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:59,387 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] [2020-08-21 22:17:59,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 22:17:59,388 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:59,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:59,388 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-08-21 22:17:59,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:59,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [225564818] [2020-08-21 22:17:59,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:59,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:59,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:59,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:59,846 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:59,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [225564818] [2020-08-21 22:17:59,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:17:59,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 22:17:59,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089818699] [2020-08-21 22:17:59,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 22:17:59,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:59,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 22:17:59,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2020-08-21 22:17:59,849 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 15 states. [2020-08-21 22:18:00,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:00,751 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-08-21 22:18:00,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 22:18:00,752 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-08-21 22:18:00,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:00,755 INFO L225 Difference]: With dead ends: 70 [2020-08-21 22:18:00,755 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 22:18:00,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2020-08-21 22:18:00,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 22:18:00,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-08-21 22:18:00,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 22:18:00,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-21 22:18:00,775 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-08-21 22:18:00,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:00,775 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-21 22:18:00,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 22:18:00,776 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-21 22:18:00,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 22:18:00,777 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:00,777 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] [2020-08-21 22:18:00,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 22:18:00,778 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:00,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:00,778 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-08-21 22:18:00,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:00,779 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1319718266] [2020-08-21 22:18:00,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:00,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:00,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:00,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:00,868 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:00,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1319718266] [2020-08-21 22:18:00,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:00,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 22:18:00,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763531063] [2020-08-21 22:18:00,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 22:18:00,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:00,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 22:18:00,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 22:18:00,871 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-21 22:18:01,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:01,091 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-08-21 22:18:01,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 22:18:01,093 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-21 22:18:01,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:01,094 INFO L225 Difference]: With dead ends: 74 [2020-08-21 22:18:01,095 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 22:18:01,095 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 [2020-08-21 22:18:01,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 22:18:01,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-08-21 22:18:01,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 22:18:01,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-21 22:18:01,104 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-08-21 22:18:01,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:01,104 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-21 22:18:01,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 22:18:01,105 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-21 22:18:01,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 22:18:01,106 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:01,106 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] [2020-08-21 22:18:01,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 22:18:01,106 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:01,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:01,107 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-08-21 22:18:01,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:01,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115626748] [2020-08-21 22:18:01,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:01,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:01,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:01,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:01,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 22:18:01,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:01,176 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 22:18:01,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115626748] [2020-08-21 22:18:01,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:01,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 22:18:01,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745248218] [2020-08-21 22:18:01,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 22:18:01,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:01,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 22:18:01,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 22:18:01,178 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-08-21 22:18:01,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:01,330 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-08-21 22:18:01,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 22:18:01,330 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-08-21 22:18:01,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:01,332 INFO L225 Difference]: With dead ends: 75 [2020-08-21 22:18:01,332 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 22:18:01,332 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 [2020-08-21 22:18:01,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 22:18:01,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-08-21 22:18:01,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 22:18:01,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-08-21 22:18:01,342 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-08-21 22:18:01,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:01,342 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-08-21 22:18:01,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 22:18:01,342 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-08-21 22:18:01,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 22:18:01,343 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:01,343 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] [2020-08-21 22:18:01,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 22:18:01,344 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:01,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:01,344 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-08-21 22:18:01,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:01,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009341997] [2020-08-21 22:18:01,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:01,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:01,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:01,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:01,736 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:01,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1009341997] [2020-08-21 22:18:01,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:01,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 22:18:01,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466426148] [2020-08-21 22:18:01,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 22:18:01,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:01,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 22:18:01,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-08-21 22:18:01,738 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2020-08-21 22:18:03,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:03,326 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2020-08-21 22:18:03,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 22:18:03,331 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-08-21 22:18:03,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:03,332 INFO L225 Difference]: With dead ends: 97 [2020-08-21 22:18:03,332 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 22:18:03,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 22:18:03,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 22:18:03,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2020-08-21 22:18:03,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 22:18:03,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-08-21 22:18:03,355 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-08-21 22:18:03,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:03,355 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-08-21 22:18:03,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 22:18:03,355 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-08-21 22:18:03,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 22:18:03,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:03,360 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] [2020-08-21 22:18:03,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 22:18:03,360 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:03,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:03,364 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-08-21 22:18:03,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:03,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1633803765] [2020-08-21 22:18:03,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:03,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:03,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:03,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:03,455 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:03,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1633803765] [2020-08-21 22:18:03,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:03,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 22:18:03,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462047636] [2020-08-21 22:18:03,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 22:18:03,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:03,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 22:18:03,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:18:03,458 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-08-21 22:18:03,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:03,734 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-08-21 22:18:03,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 22:18:03,735 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-21 22:18:03,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:03,736 INFO L225 Difference]: With dead ends: 88 [2020-08-21 22:18:03,736 INFO L226 Difference]: Without dead ends: 77 [2020-08-21 22:18:03,737 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 [2020-08-21 22:18:03,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-21 22:18:03,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-08-21 22:18:03,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 22:18:03,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-08-21 22:18:03,746 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-08-21 22:18:03,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:03,746 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-08-21 22:18:03,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 22:18:03,747 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-08-21 22:18:03,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 22:18:03,748 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:03,748 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] [2020-08-21 22:18:03,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 22:18:03,748 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:03,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:03,752 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-08-21 22:18:03,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:03,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196958716] [2020-08-21 22:18:03,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:03,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 22:18:03,775 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 22:18:03,775 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 22:18:03,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 22:18:03,799 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 10:18:03 BoogieIcfgContainer [2020-08-21 22:18:03,799 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 22:18:03,802 INFO L168 Benchmark]: Toolchain (without parser) took 7670.85 ms. Allocated memory was 137.9 MB in the beginning and 293.6 MB in the end (delta: 155.7 MB). Free memory was 101.4 MB in the beginning and 90.9 MB in the end (delta: 10.5 MB). Peak memory consumption was 166.2 MB. Max. memory is 7.1 GB. [2020-08-21 22:18:03,803 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 137.9 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 22:18:03,804 INFO L168 Benchmark]: CACSL2BoogieTranslator took 305.57 ms. Allocated memory is still 137.9 MB. Free memory was 101.1 MB in the beginning and 90.8 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-08-21 22:18:03,805 INFO L168 Benchmark]: Boogie Preprocessor took 119.61 ms. Allocated memory was 137.9 MB in the beginning and 199.8 MB in the end (delta: 61.9 MB). Free memory was 90.8 MB in the beginning and 177.6 MB in the end (delta: -86.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-21 22:18:03,805 INFO L168 Benchmark]: RCFGBuilder took 387.98 ms. Allocated memory is still 199.8 MB. Free memory was 177.6 MB in the beginning and 160.4 MB in the end (delta: 17.2 MB). Peak memory consumption was 17.2 MB. Max. memory is 7.1 GB. [2020-08-21 22:18:03,806 INFO L168 Benchmark]: TraceAbstraction took 6852.60 ms. Allocated memory was 199.8 MB in the beginning and 293.6 MB in the end (delta: 93.8 MB). Free memory was 160.4 MB in the beginning and 90.9 MB in the end (delta: 69.5 MB). Peak memory consumption was 163.3 MB. Max. memory is 7.1 GB. [2020-08-21 22:18:03,810 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 137.9 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 305.57 ms. Allocated memory is still 137.9 MB. Free memory was 101.1 MB in the beginning and 90.8 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 119.61 ms. Allocated memory was 137.9 MB in the beginning and 199.8 MB in the end (delta: 61.9 MB). Free memory was 90.8 MB in the beginning and 177.6 MB in the end (delta: -86.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 387.98 ms. Allocated memory is still 199.8 MB. Free memory was 177.6 MB in the beginning and 160.4 MB in the end (delta: 17.2 MB). Peak memory consumption was 17.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6852.60 ms. Allocated memory was 199.8 MB in the beginning and 293.6 MB in the end (delta: 93.8 MB). Free memory was 160.4 MB in the beginning and 90.9 MB in the end (delta: 69.5 MB). Peak memory consumption was 163.3 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