/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 23:39:51,037 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 23:39:51,039 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 23:39:51,063 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 23:39:51,064 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 23:39:51,065 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 23:39:51,066 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 23:39:51,068 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 23:39:51,069 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 23:39:51,070 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 23:39:51,071 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 23:39:51,072 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 23:39:51,073 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 23:39:51,074 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 23:39:51,075 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 23:39:51,076 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 23:39:51,076 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 23:39:51,077 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 23:39:51,079 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 23:39:51,081 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 23:39:51,083 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 23:39:51,084 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 23:39:51,085 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 23:39:51,086 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 23:39:51,088 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 23:39:51,096 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 23:39:51,097 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 23:39:51,098 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 23:39:51,099 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 23:39:51,127 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 23:39:51,128 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 23:39:51,129 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 23:39:51,129 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 23:39:51,129 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 23:39:51,130 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 23:39:51,130 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 23:39:51,130 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 23:39:51,130 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 23:39:51,130 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 23:39:51,131 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 23:39:51,131 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 23:39:51,132 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 23:39:51,132 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 23:39:51,132 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 23:39:51,132 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 23:39:51,132 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 23:39:51,133 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 23:39:51,133 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 23:39:51,133 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 23:39:51,133 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 23:39:51,133 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 23:39:51,134 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 23:39:51,135 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 23:39:51,135 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 23:39:51,135 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 23:39:51,135 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 23:39:51,136 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 23:39:51,136 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 23:39:51,137 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=WIDESTAMONGSMALL;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2; [2020-08-18 23:39:51,453 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 23:39:51,466 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 23:39:51,469 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 23:39:51,471 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 23:39:51,471 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 23:39:51,472 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-18 23:39:51,553 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/31526f57a/20f38427632642d29e59dd76d9b5b33c/FLAG212ba0a41 [2020-08-18 23:39:52,039 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 23:39:52,040 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-18 23:39:52,046 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/31526f57a/20f38427632642d29e59dd76d9b5b33c/FLAG212ba0a41 [2020-08-18 23:39:52,429 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/31526f57a/20f38427632642d29e59dd76d9b5b33c [2020-08-18 23:39:52,438 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 23:39:52,439 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 23:39:52,440 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 23:39:52,441 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 23:39:52,444 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 23:39:52,445 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:39:52" (1/1) ... [2020-08-18 23:39:52,448 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@194291ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:52, skipping insertion in model container [2020-08-18 23:39:52,448 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:39:52" (1/1) ... [2020-08-18 23:39:52,456 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 23:39:52,474 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 23:39:52,639 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 23:39:52,643 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 23:39:52,661 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 23:39:52,677 INFO L208 MainTranslator]: Completed translation [2020-08-18 23:39:52,677 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:52 WrapperNode [2020-08-18 23:39:52,677 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 23:39:52,678 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 23:39:52,678 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 23:39:52,678 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 23:39:52,688 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:52" (1/1) ... [2020-08-18 23:39:52,688 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:52" (1/1) ... [2020-08-18 23:39:52,772 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:52" (1/1) ... [2020-08-18 23:39:52,773 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:52" (1/1) ... [2020-08-18 23:39:52,780 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:52" (1/1) ... [2020-08-18 23:39:52,786 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:52" (1/1) ... [2020-08-18 23:39:52,787 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:52" (1/1) ... [2020-08-18 23:39:52,788 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 23:39:52,789 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 23:39:52,789 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 23:39:52,789 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 23:39:52,790 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:52" (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 23:39:52,858 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 23:39:52,858 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 23:39:52,859 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 23:39:52,860 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 23:39:52,860 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 23:39:52,860 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 23:39:52,860 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 23:39:52,860 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 23:39:52,860 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 23:39:52,860 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 23:39:52,860 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 23:39:52,861 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 23:39:52,861 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 23:39:53,087 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 23:39:53,088 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 23:39:53,092 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:39:53 BoogieIcfgContainer [2020-08-18 23:39:53,092 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 23:39:53,094 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 23:39:53,094 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 23:39:53,097 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 23:39:53,097 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 11:39:52" (1/3) ... [2020-08-18 23:39:53,098 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a76e20b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:39:53, skipping insertion in model container [2020-08-18 23:39:53,099 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:39:52" (2/3) ... [2020-08-18 23:39:53,099 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a76e20b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:39:53, skipping insertion in model container [2020-08-18 23:39:53,099 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:39:53" (3/3) ... [2020-08-18 23:39:53,101 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-18 23:39:53,113 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 23:39:53,121 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 23:39:53,138 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 23:39:53,184 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 23:39:53,184 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 23:39:53,184 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 23:39:53,184 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 23:39:53,185 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 23:39:53,185 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 23:39:53,185 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 23:39:53,185 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 23:39:53,214 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-18 23:39:53,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 23:39:53,221 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:53,227 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:53,227 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:53,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:53,234 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-18 23:39:53,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:53,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [317998972] [2020-08-18 23:39:53,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:53,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:53,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:53,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:53,384 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 23:39:53,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [317998972] [2020-08-18 23:39:53,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:39:53,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 23:39:53,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258351495] [2020-08-18 23:39:53,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 23:39:53,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:53,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 23:39:53,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 23:39:53,407 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-18 23:39:53,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:53,427 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-18 23:39:53,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 23:39:53,428 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-18 23:39:53,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:53,436 INFO L225 Difference]: With dead ends: 35 [2020-08-18 23:39:53,436 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 23:39:53,439 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 23:39:53,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 23:39:53,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 23:39:53,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 23:39:53,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 23:39:53,475 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-18 23:39:53,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:53,475 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 23:39:53,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 23:39:53,476 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 23:39:53,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 23:39:53,476 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:53,476 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:53,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 23:39:53,477 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:53,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:53,478 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-18 23:39:53,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:53,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1927000005] [2020-08-18 23:39:53,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:53,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:53,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:53,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:53,530 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 23:39:53,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1927000005] [2020-08-18 23:39:53,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:39:53,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 23:39:53,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800322276] [2020-08-18 23:39:53,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 23:39:53,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:53,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 23:39:53,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 23:39:53,535 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-18 23:39:53,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:53,563 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-18 23:39:53,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 23:39:53,565 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-18 23:39:53,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:53,566 INFO L225 Difference]: With dead ends: 24 [2020-08-18 23:39:53,566 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 23:39:53,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 23:39:53,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 23:39:53,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 23:39:53,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 23:39:53,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-18 23:39:53,572 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-18 23:39:53,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:53,573 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-18 23:39:53,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 23:39:53,573 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-18 23:39:53,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 23:39:53,574 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:53,574 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:53,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 23:39:53,575 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:53,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:53,575 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-18 23:39:53,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:53,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213119965] [2020-08-18 23:39:53,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:53,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:53,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:53,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:53,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:53,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213119965] [2020-08-18 23:39:53,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:39:53,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 23:39:53,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287124380] [2020-08-18 23:39:53,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 23:39:53,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:53,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 23:39:53,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 23:39:53,847 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-18 23:39:53,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:53,910 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-18 23:39:53,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 23:39:53,911 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 23:39:53,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:53,912 INFO L225 Difference]: With dead ends: 23 [2020-08-18 23:39:53,912 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 23:39:53,913 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 23:39:53,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 23:39:53,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 23:39:53,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 23:39:53,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-18 23:39:53,918 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-18 23:39:53,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:53,919 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-18 23:39:53,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 23:39:53,919 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-18 23:39:53,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 23:39:53,920 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:53,920 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:53,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 23:39:53,921 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:53,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:53,921 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-18 23:39:53,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:53,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1897010581] [2020-08-18 23:39:53,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:53,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:54,133 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 15 [2020-08-18 23:39:54,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:54,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:54,143 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:54,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1897010581] [2020-08-18 23:39:54,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 23:39:54,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 23:39:54,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467471113] [2020-08-18 23:39:54,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 23:39:54,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:54,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 23:39:54,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 23:39:54,151 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-18 23:39:54,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:54,186 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-18 23:39:54,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 23:39:54,187 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-18 23:39:54,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:54,188 INFO L225 Difference]: With dead ends: 26 [2020-08-18 23:39:54,189 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 23:39:54,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 23:39:54,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 23:39:54,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 23:39:54,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 23:39:54,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 23:39:54,201 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-18 23:39:54,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:54,201 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 23:39:54,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 23:39:54,202 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 23:39:54,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 23:39:54,205 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:54,205 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:54,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 23:39:54,206 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:54,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:54,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-18 23:39:54,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:54,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1049739991] [2020-08-18 23:39:54,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:54,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:54,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:54,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:54,485 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 23:39:54,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1049739991] [2020-08-18 23:39:54,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:54,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 23:39:54,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156840467] [2020-08-18 23:39:54,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 23:39:54,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:54,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 23:39:54,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 23:39:54,494 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-18 23:39:54,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:54,636 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 23:39:54,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 23:39:54,638 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-18 23:39:54,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:54,639 INFO L225 Difference]: With dead ends: 26 [2020-08-18 23:39:54,639 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 23:39:54,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 23:39:54,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 23:39:54,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 23:39:54,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 23:39:54,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 23:39:54,649 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-18 23:39:54,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:54,652 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 23:39:54,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 23:39:54,652 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 23:39:54,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 23:39:54,653 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:54,653 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:54,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 23:39:54,654 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:54,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:54,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-18 23:39:54,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:54,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [337862703] [2020-08-18 23:39:54,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:54,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:54,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:54,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:54,953 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:54,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [337862703] [2020-08-18 23:39:54,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:54,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 23:39:54,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769138433] [2020-08-18 23:39:54,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 23:39:54,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:54,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 23:39:54,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 23:39:54,957 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-18 23:39:55,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:55,104 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 23:39:55,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 23:39:55,105 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-18 23:39:55,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:55,106 INFO L225 Difference]: With dead ends: 29 [2020-08-18 23:39:55,106 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 23:39:55,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 23:39:55,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 23:39:55,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 23:39:55,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 23:39:55,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 23:39:55,120 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-18 23:39:55,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:55,121 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 23:39:55,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 23:39:55,121 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 23:39:55,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 23:39:55,124 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:55,124 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:55,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 23:39:55,125 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:55,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:55,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-18 23:39:55,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:55,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703185429] [2020-08-18 23:39:55,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:55,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:55,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:39:55,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:39:55,436 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:39:55,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703185429] [2020-08-18 23:39:55,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:39:55,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 23:39:55,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108461955] [2020-08-18 23:39:55,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 23:39:55,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:39:55,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 23:39:55,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 23:39:55,439 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-18 23:39:59,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:39:59,851 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 23:39:59,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 23:39:59,852 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-18 23:39:59,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:39:59,853 INFO L225 Difference]: With dead ends: 32 [2020-08-18 23:39:59,853 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 23:39:59,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=33, Invalid=148, Unknown=1, NotChecked=0, Total=182 [2020-08-18 23:39:59,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 23:39:59,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 23:39:59,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 23:39:59,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 23:39:59,860 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-18 23:39:59,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:39:59,861 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 23:39:59,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 23:39:59,861 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 23:39:59,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 23:39:59,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:39:59,862 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:39:59,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 23:39:59,863 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:39:59,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:39:59,863 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-18 23:39:59,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:39:59,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2081552282] [2020-08-18 23:39:59,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:39:59,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:00,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:00,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:00,207 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:00,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2081552282] [2020-08-18 23:40:00,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:00,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 23:40:00,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044965651] [2020-08-18 23:40:00,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 23:40:00,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:00,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 23:40:00,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 23:40:00,209 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-18 23:40:00,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:00,444 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 23:40:00,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 23:40:00,445 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-18 23:40:00,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:00,446 INFO L225 Difference]: With dead ends: 35 [2020-08-18 23:40:00,446 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 23:40:00,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-18 23:40:00,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 23:40:00,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 23:40:00,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 23:40:00,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 23:40:00,452 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-18 23:40:00,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:00,452 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 23:40:00,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 23:40:00,452 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 23:40:00,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 23:40:00,453 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:00,453 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:00,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 23:40:00,454 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:00,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:00,454 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-18 23:40:00,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:00,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1040221183] [2020-08-18 23:40:00,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:00,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:00,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:00,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:00,826 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:00,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1040221183] [2020-08-18 23:40:00,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:00,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 23:40:00,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991185363] [2020-08-18 23:40:00,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 23:40:00,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:00,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 23:40:00,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 23:40:00,835 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-18 23:40:03,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:03,204 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 23:40:03,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 23:40:03,204 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-18 23:40:03,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:03,205 INFO L225 Difference]: With dead ends: 38 [2020-08-18 23:40:03,205 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 23:40:03,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-08-18 23:40:03,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 23:40:03,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 23:40:03,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 23:40:03,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 23:40:03,217 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-18 23:40:03,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:03,217 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 23:40:03,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 23:40:03,218 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 23:40:03,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 23:40:03,218 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:03,219 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:03,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 23:40:03,219 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:03,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:03,219 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-18 23:40:03,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:03,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [354277304] [2020-08-18 23:40:03,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:03,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:03,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:03,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:03,683 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:03,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [354277304] [2020-08-18 23:40:03,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:03,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 23:40:03,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483579953] [2020-08-18 23:40:03,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 23:40:03,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:03,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 23:40:03,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 23:40:03,686 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-18 23:40:12,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:12,386 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 23:40:12,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 23:40:12,387 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-18 23:40:12,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:12,388 INFO L225 Difference]: With dead ends: 41 [2020-08-18 23:40:12,388 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 23:40:12,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-18 23:40:12,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 23:40:12,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 23:40:12,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 23:40:12,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 23:40:12,393 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-18 23:40:12,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:12,394 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 23:40:12,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 23:40:12,394 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 23:40:12,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 23:40:12,395 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:12,395 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:12,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 23:40:12,396 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:12,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:12,396 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-18 23:40:12,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:12,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [840252161] [2020-08-18 23:40:12,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:12,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:13,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:13,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:13,016 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:13,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [840252161] [2020-08-18 23:40:13,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:13,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 23:40:13,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287305105] [2020-08-18 23:40:13,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 23:40:13,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:13,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 23:40:13,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 23:40:13,019 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-18 23:40:30,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:30,063 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 23:40:30,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 23:40:30,064 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-18 23:40:30,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:30,064 INFO L225 Difference]: With dead ends: 44 [2020-08-18 23:40:30,065 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 23:40:30,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=49, Invalid=409, Unknown=4, NotChecked=0, Total=462 [2020-08-18 23:40:30,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 23:40:30,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 23:40:30,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 23:40:30,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 23:40:30,075 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-18 23:40:30,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:30,076 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 23:40:30,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 23:40:30,076 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 23:40:30,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 23:40:30,077 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:30,078 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:30,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 23:40:30,079 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:30,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:30,080 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-18 23:40:30,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:30,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2111770078] [2020-08-18 23:40:30,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:30,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:30,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:30,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:30,739 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:30,739 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2111770078] [2020-08-18 23:40:30,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:30,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 23:40:30,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958855389] [2020-08-18 23:40:30,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 23:40:30,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:30,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 23:40:30,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 23:40:30,742 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-18 23:40:33,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:33,221 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 23:40:33,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 23:40:33,221 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-18 23:40:33,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:33,222 INFO L225 Difference]: With dead ends: 47 [2020-08-18 23:40:33,223 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 23:40:33,224 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-18 23:40:33,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 23:40:33,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 23:40:33,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 23:40:33,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 23:40:33,229 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-18 23:40:33,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:33,229 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 23:40:33,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 23:40:33,229 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 23:40:33,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 23:40:33,230 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:33,230 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:33,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 23:40:33,231 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:33,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:33,231 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-18 23:40:33,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:33,231 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1450205986] [2020-08-18 23:40:33,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:33,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:33,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:33,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:34,001 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:34,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1450205986] [2020-08-18 23:40:34,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:34,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 23:40:34,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927193033] [2020-08-18 23:40:34,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 23:40:34,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:34,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 23:40:34,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 23:40:34,004 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-18 23:40:51,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:40:51,223 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 23:40:51,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 23:40:51,224 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-18 23:40:51,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:40:51,225 INFO L225 Difference]: With dead ends: 50 [2020-08-18 23:40:51,225 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 23:40:51,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=57, Invalid=590, Unknown=3, NotChecked=0, Total=650 [2020-08-18 23:40:51,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 23:40:51,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 23:40:51,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 23:40:51,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 23:40:51,231 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-18 23:40:51,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:40:51,231 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 23:40:51,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 23:40:51,231 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 23:40:51,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 23:40:51,232 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:40:51,232 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:40:51,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 23:40:51,233 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:40:51,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:40:51,233 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-18 23:40:51,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:40:51,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152248306] [2020-08-18 23:40:51,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:40:51,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:52,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:40:52,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:40:52,211 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:40:52,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152248306] [2020-08-18 23:40:52,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:40:52,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 23:40:52,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380350691] [2020-08-18 23:40:52,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 23:40:52,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:40:52,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 23:40:52,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 23:40:52,214 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-18 23:41:05,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 23:41:05,464 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 23:41:05,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 23:41:05,465 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-18 23:41:05,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 23:41:05,466 INFO L225 Difference]: With dead ends: 53 [2020-08-18 23:41:05,466 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 23:41:05,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=61, Invalid=691, Unknown=4, NotChecked=0, Total=756 [2020-08-18 23:41:05,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 23:41:05,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 23:41:05,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 23:41:05,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 23:41:05,474 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-18 23:41:05,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 23:41:05,474 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 23:41:05,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 23:41:05,476 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 23:41:05,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 23:41:05,477 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 23:41:05,477 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 23:41:05,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 23:41:05,479 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 23:41:05,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 23:41:05,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-18 23:41:05,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 23:41:05,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031657141] [2020-08-18 23:41:05,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 23:41:05,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:41:06,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 23:41:06,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 23:41:06,426 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 23:41:06,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031657141] [2020-08-18 23:41:06,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 23:41:06,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 23:41:06,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765280176] [2020-08-18 23:41:06,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 23:41:06,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 23:41:06,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 23:41:06,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 23:41:06,428 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states.