/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=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 17:28:27,488 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 17:28:27,491 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 17:28:27,521 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 17:28:27,521 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:28:27,523 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:28:27,524 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:28:27,526 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:28:27,528 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:28:27,529 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:28:27,530 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:28:27,531 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:28:27,531 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:28:27,532 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:28:27,533 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:28:27,534 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:28:27,536 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:28:27,537 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:28:27,539 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:28:27,541 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:28:27,542 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:28:27,543 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:28:27,545 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:28:27,545 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:28:27,548 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 17:28:27,548 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 17:28:27,548 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 17:28:27,549 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 17:28:27,550 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 17:28:27,550 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 17:28:27,556 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:28:27,556 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:28:27,557 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:28:27,558 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 17:28:27,581 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:28:27,581 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:28:27,582 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:28:27,583 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:28:27,583 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:28:27,583 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:28:27,583 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:28:27,583 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:28:27,584 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:28:27,584 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:28:27,584 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:28:27,584 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:28:27,584 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:28:27,585 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:28:27,585 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:28:27,585 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:28:27,585 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:28:27,585 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:28:27,586 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:28:27,586 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:28:27,586 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:28:27,586 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:28:27,586 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:28:27,587 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:28:27,587 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:28:27,587 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:28:27,587 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:28:27,587 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:28:27,587 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:28:27,588 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=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:28:27,890 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:28:27,902 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:28:27,906 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:28:27,907 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:28:27,908 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:28:27,909 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 17:28:27,966 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c735bbf7c/f0e4a0b4d36d41e5a46e030036b08e30/FLAGe739b2d71 [2020-08-21 17:28:28,424 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:28:28,425 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 17:28:28,430 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c735bbf7c/f0e4a0b4d36d41e5a46e030036b08e30/FLAGe739b2d71 [2020-08-21 17:28:28,798 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c735bbf7c/f0e4a0b4d36d41e5a46e030036b08e30 [2020-08-21 17:28:28,807 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:28:28,808 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:28:28,809 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:28:28,809 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:28:28,813 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:28:28,814 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:28:28" (1/1) ... [2020-08-21 17:28:28,817 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d85ba32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:28, skipping insertion in model container [2020-08-21 17:28:28,817 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:28:28" (1/1) ... [2020-08-21 17:28:28,825 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:28:28,847 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:28:29,019 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:28:29,023 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:28:29,042 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:28:29,057 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:28:29,057 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:29 WrapperNode [2020-08-21 17:28:29,058 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:28:29,058 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:28:29,059 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:28:29,059 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:28:29,073 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:29" (1/1) ... [2020-08-21 17:28:29,073 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:29" (1/1) ... [2020-08-21 17:28:29,079 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:29" (1/1) ... [2020-08-21 17:28:29,079 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:29" (1/1) ... [2020-08-21 17:28:29,084 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:29" (1/1) ... [2020-08-21 17:28:29,089 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:29" (1/1) ... [2020-08-21 17:28:29,090 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:29" (1/1) ... [2020-08-21 17:28:29,175 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:28:29,175 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:28:29,175 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:28:29,176 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:28:29,177 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:29" (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 17:28:29,245 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:28:29,246 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:28:29,246 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 17:28:29,246 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 17:28:29,246 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:28:29,246 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:28:29,246 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 17:28:29,247 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 17:28:29,247 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 17:28:29,247 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 17:28:29,247 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:28:29,247 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:28:29,247 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:28:29,461 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:28:29,461 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 17:28:29,468 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:28:29 BoogieIcfgContainer [2020-08-21 17:28:29,469 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:28:29,471 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:28:29,473 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:28:29,476 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:28:29,477 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:28:28" (1/3) ... [2020-08-21 17:28:29,478 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@99ebdc9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:28:29, skipping insertion in model container [2020-08-21 17:28:29,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:29" (2/3) ... [2020-08-21 17:28:29,479 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@99ebdc9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:28:29, skipping insertion in model container [2020-08-21 17:28:29,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:28:29" (3/3) ... [2020-08-21 17:28:29,484 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-21 17:28:29,493 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:28:29,500 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 17:28:29,514 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 17:28:29,538 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:28:29,538 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:28:29,538 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:28:29,539 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:28:29,539 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:28:29,539 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:28:29,539 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:28:29,539 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:28:29,558 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-21 17:28:29,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 17:28:29,564 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:29,565 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:29,565 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:29,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:29,570 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-21 17:28:29,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:29,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2123971461] [2020-08-21 17:28:29,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:29,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:29,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:29,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:29,689 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 17:28:29,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2123971461] [2020-08-21 17:28:29,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:28:29,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 17:28:29,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281892094] [2020-08-21 17:28:29,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 17:28:29,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:29,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 17:28:29,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 17:28:29,718 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-21 17:28:29,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:29,741 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-21 17:28:29,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 17:28:29,743 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-21 17:28:29,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:29,753 INFO L225 Difference]: With dead ends: 35 [2020-08-21 17:28:29,753 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 17:28:29,757 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 [2020-08-21 17:28:29,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 17:28:29,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 17:28:29,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 17:28:29,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 17:28:29,796 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-21 17:28:29,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:29,797 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 17:28:29,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 17:28:29,797 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 17:28:29,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 17:28:29,798 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:29,798 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:29,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:28:29,799 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:29,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:29,799 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-21 17:28:29,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:29,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480341537] [2020-08-21 17:28:29,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:29,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:29,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:29,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:29,853 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 17:28:29,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480341537] [2020-08-21 17:28:29,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:28:29,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 17:28:29,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539714534] [2020-08-21 17:28:29,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 17:28:29,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:29,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 17:28:29,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 17:28:29,858 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-21 17:28:29,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:29,872 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-21 17:28:29,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 17:28:29,873 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-21 17:28:29,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:29,875 INFO L225 Difference]: With dead ends: 24 [2020-08-21 17:28:29,875 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 17:28:29,876 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 [2020-08-21 17:28:29,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 17:28:29,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 17:28:29,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 17:28:29,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-21 17:28:29,881 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-21 17:28:29,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:29,882 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-21 17:28:29,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 17:28:29,882 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-21 17:28:29,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 17:28:29,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:29,883 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:29,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:28:29,884 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:29,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:29,884 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-21 17:28:29,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:29,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232235047] [2020-08-21 17:28:29,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:29,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:30,248 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 16 [2020-08-21 17:28:30,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:30,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:30,277 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 17:28:30,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232235047] [2020-08-21 17:28:30,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:28:30,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 17:28:30,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060293462] [2020-08-21 17:28:30,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:28:30,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:30,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:28:30,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:28:30,280 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-21 17:28:30,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:30,325 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-21 17:28:30,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:28:30,326 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 17:28:30,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:30,327 INFO L225 Difference]: With dead ends: 23 [2020-08-21 17:28:30,327 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 17:28:30,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:28:30,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 17:28:30,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 17:28:30,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 17:28:30,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-21 17:28:30,334 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-21 17:28:30,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:30,334 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-21 17:28:30,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:28:30,335 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-21 17:28:30,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 17:28:30,336 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:30,336 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:30,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 17:28:30,337 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:30,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:30,337 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-21 17:28:30,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:30,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1796396432] [2020-08-21 17:28:30,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:30,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:30,549 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 15 [2020-08-21 17:28:30,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:30,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:30,555 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:30,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1796396432] [2020-08-21 17:28:30,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:28:30,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 17:28:30,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291750029] [2020-08-21 17:28:30,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 17:28:30,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:30,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 17:28:30,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:28:30,558 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-21 17:28:30,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:30,581 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-21 17:28:30,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 17:28:30,581 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-21 17:28:30,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:30,582 INFO L225 Difference]: With dead ends: 26 [2020-08-21 17:28:30,583 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 17:28:30,583 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 [2020-08-21 17:28:30,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 17:28:30,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 17:28:30,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 17:28:30,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 17:28:30,588 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-21 17:28:30,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:30,589 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 17:28:30,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 17:28:30,589 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 17:28:30,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 17:28:30,590 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:30,590 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:30,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 17:28:30,590 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:30,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:30,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-21 17:28:30,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:30,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [805296323] [2020-08-21 17:28:30,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:30,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:30,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:30,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:30,842 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 17:28:30,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [805296323] [2020-08-21 17:28:30,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:30,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:28:30,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137885522] [2020-08-21 17:28:30,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:28:30,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:30,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:28:30,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:28:30,848 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-21 17:28:30,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:30,969 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 17:28:30,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:28:30,970 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-21 17:28:30,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:30,971 INFO L225 Difference]: With dead ends: 26 [2020-08-21 17:28:30,971 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 17:28:30,972 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 [2020-08-21 17:28:30,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 17:28:30,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 17:28:30,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 17:28:30,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 17:28:30,977 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-21 17:28:30,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:30,978 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 17:28:30,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:28:30,978 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 17:28:30,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 17:28:30,979 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:30,979 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:30,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 17:28:30,980 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:30,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:30,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-21 17:28:30,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:30,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741497173] [2020-08-21 17:28:30,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:31,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:31,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:31,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:31,260 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:31,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741497173] [2020-08-21 17:28:31,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:31,261 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 17:28:31,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209715719] [2020-08-21 17:28:31,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 17:28:31,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:31,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 17:28:31,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:28:31,267 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-21 17:28:31,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:31,393 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 17:28:31,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 17:28:31,394 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-21 17:28:31,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:31,395 INFO L225 Difference]: With dead ends: 29 [2020-08-21 17:28:31,395 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 17:28:31,396 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 [2020-08-21 17:28:31,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 17:28:31,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 17:28:31,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 17:28:31,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 17:28:31,400 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-21 17:28:31,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:31,401 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 17:28:31,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 17:28:31,401 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 17:28:31,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 17:28:31,402 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:31,402 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:31,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 17:28:31,402 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:31,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:31,403 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-21 17:28:31,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:31,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1125445249] [2020-08-21 17:28:31,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:31,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:31,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:31,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:31,651 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:31,651 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1125445249] [2020-08-21 17:28:31,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:31,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 17:28:31,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671607938] [2020-08-21 17:28:31,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 17:28:31,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:31,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 17:28:31,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:28:31,653 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-21 17:28:36,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:36,022 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 17:28:36,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 17:28:36,023 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-21 17:28:36,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:36,024 INFO L225 Difference]: With dead ends: 32 [2020-08-21 17:28:36,024 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 17:28:36,025 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 [2020-08-21 17:28:36,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 17:28:36,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 17:28:36,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 17:28:36,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 17:28:36,035 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-21 17:28:36,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:36,035 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 17:28:36,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 17:28:36,036 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 17:28:36,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 17:28:36,038 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:36,038 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:36,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 17:28:36,039 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:36,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:36,040 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-21 17:28:36,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:36,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1102954762] [2020-08-21 17:28:36,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:36,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:36,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:36,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:36,476 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:36,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1102954762] [2020-08-21 17:28:36,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:36,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 17:28:36,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474664190] [2020-08-21 17:28:36,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 17:28:36,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:36,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 17:28:36,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:28:36,479 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-21 17:28:36,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:36,684 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 17:28:36,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 17:28:36,684 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-21 17:28:36,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:36,685 INFO L225 Difference]: With dead ends: 35 [2020-08-21 17:28:36,685 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 17:28:36,686 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 [2020-08-21 17:28:36,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 17:28:36,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 17:28:36,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 17:28:36,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 17:28:36,691 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-21 17:28:36,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:36,691 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 17:28:36,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 17:28:36,691 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 17:28:36,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 17:28:36,692 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:36,692 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:36,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 17:28:36,693 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:36,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:36,693 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-21 17:28:36,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:36,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [854138797] [2020-08-21 17:28:36,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:36,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:37,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:37,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:37,055 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:37,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [854138797] [2020-08-21 17:28:37,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:37,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 17:28:37,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623194873] [2020-08-21 17:28:37,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 17:28:37,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:37,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 17:28:37,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:28:37,058 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-21 17:28:43,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:43,546 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 17:28:43,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 17:28:43,547 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-21 17:28:43,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:43,548 INFO L225 Difference]: With dead ends: 38 [2020-08-21 17:28:43,548 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 17:28:43,549 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 [2020-08-21 17:28:43,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 17:28:43,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 17:28:43,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 17:28:43,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 17:28:43,553 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-21 17:28:43,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:43,554 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 17:28:43,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 17:28:43,554 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 17:28:43,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 17:28:43,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:43,555 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:43,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 17:28:43,556 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:43,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:43,556 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-21 17:28:43,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:43,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282197472] [2020-08-21 17:28:43,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:43,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:43,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:43,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:44,002 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:44,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282197472] [2020-08-21 17:28:44,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:44,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 17:28:44,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744222145] [2020-08-21 17:28:44,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 17:28:44,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:44,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 17:28:44,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:28:44,004 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-21 17:28:46,143 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 22 [2020-08-21 17:28:52,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:52,646 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 17:28:52,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 17:28:52,647 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-21 17:28:52,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:52,648 INFO L225 Difference]: With dead ends: 41 [2020-08-21 17:28:52,649 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 17:28:52,649 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-21 17:28:52,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 17:28:52,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 17:28:52,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 17:28:52,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 17:28:52,654 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-21 17:28:52,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:52,654 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 17:28:52,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 17:28:52,654 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 17:28:52,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 17:28:52,655 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:52,655 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:52,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 17:28:52,656 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:52,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:52,656 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-21 17:28:52,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:52,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762983846] [2020-08-21 17:28:52,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:52,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:53,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:53,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:53,184 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:53,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762983846] [2020-08-21 17:28:53,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:53,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 17:28:53,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149879080] [2020-08-21 17:28:53,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 17:28:53,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:53,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 17:28:53,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:28:53,189 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-21 17:28:59,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:59,796 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 17:28:59,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 17:28:59,796 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-21 17:28:59,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:59,798 INFO L225 Difference]: With dead ends: 44 [2020-08-21 17:28:59,798 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 17:28:59,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=49, Invalid=411, Unknown=2, NotChecked=0, Total=462 [2020-08-21 17:28:59,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 17:28:59,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 17:28:59,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 17:28:59,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 17:28:59,803 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-21 17:28:59,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:59,804 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 17:28:59,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 17:28:59,804 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 17:28:59,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 17:28:59,805 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:59,805 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:59,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 17:28:59,805 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:59,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:59,806 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-21 17:28:59,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:59,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [620072282] [2020-08-21 17:28:59,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:59,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:29:00,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:29:00,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:29:00,397 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:29:00,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [620072282] [2020-08-21 17:29:00,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:29:00,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 17:29:00,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651171673] [2020-08-21 17:29:00,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 17:29:00,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:29:00,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 17:29:00,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:29:00,400 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-21 17:29:00,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:29:00,874 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 17:29:00,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 17:29:00,876 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-21 17:29:00,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:29:00,877 INFO L225 Difference]: With dead ends: 47 [2020-08-21 17:29:00,877 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 17:29:00,878 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 [2020-08-21 17:29:00,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 17:29:00,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 17:29:00,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 17:29:00,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 17:29:00,882 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-21 17:29:00,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:29:00,883 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 17:29:00,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 17:29:00,883 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 17:29:00,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 17:29:00,884 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:29:00,884 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:29:00,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 17:29:00,884 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:29:00,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:29:00,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-21 17:29:00,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:29:00,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [834780182] [2020-08-21 17:29:00,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:29:00,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:29:01,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:29:01,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:29:01,630 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:29:01,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [834780182] [2020-08-21 17:29:01,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:29:01,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 17:29:01,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939779167] [2020-08-21 17:29:01,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 17:29:01,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:29:01,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 17:29:01,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:29:01,633 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-21 17:29:10,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:29:10,155 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 17:29:10,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 17:29:10,155 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-21 17:29:10,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:29:10,156 INFO L225 Difference]: With dead ends: 50 [2020-08-21 17:29:10,156 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 17:29:10,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=57, Invalid=592, Unknown=1, NotChecked=0, Total=650 [2020-08-21 17:29:10,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 17:29:10,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 17:29:10,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 17:29:10,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 17:29:10,162 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-21 17:29:10,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:29:10,163 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 17:29:10,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 17:29:10,163 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 17:29:10,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 17:29:10,164 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:29:10,164 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:29:10,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 17:29:10,164 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:29:10,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:29:10,165 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-21 17:29:10,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:29:10,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1208363089] [2020-08-21 17:29:10,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:29:10,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:29:10,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:29:10,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:29:10,984 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:29:10,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1208363089] [2020-08-21 17:29:10,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:29:10,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 17:29:10,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052955195] [2020-08-21 17:29:10,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 17:29:10,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:29:10,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 17:29:10,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 17:29:10,987 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-21 17:29:30,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:29:30,399 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 17:29:30,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 17:29:30,399 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-21 17:29:30,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:29:30,400 INFO L225 Difference]: With dead ends: 53 [2020-08-21 17:29:30,400 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 17:29:30,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=61, Invalid=692, Unknown=3, NotChecked=0, Total=756 [2020-08-21 17:29:30,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 17:29:30,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 17:29:30,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 17:29:30,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 17:29:30,406 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-21 17:29:30,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:29:30,407 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 17:29:30,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 17:29:30,407 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 17:29:30,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 17:29:30,408 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:29:30,408 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:29:30,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 17:29:30,408 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:29:30,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:29:30,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-21 17:29:30,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:29:30,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [411013084] [2020-08-21 17:29:30,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:29:30,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:29:31,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:29:31,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:29:31,392 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:29:31,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [411013084] [2020-08-21 17:29:31,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:29:31,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 17:29:31,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971477460] [2020-08-21 17:29:31,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 17:29:31,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:29:31,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 17:29:31,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:29:31,397 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states. [2020-08-21 17:29:42,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:29:42,800 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 17:29:42,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 17:29:42,801 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 46 [2020-08-21 17:29:42,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:29:42,802 INFO L225 Difference]: With dead ends: 56 [2020-08-21 17:29:42,802 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 17:29:42,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=65, Invalid=802, Unknown=3, NotChecked=0, Total=870 [2020-08-21 17:29:42,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 17:29:42,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 17:29:42,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 17:29:42,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 17:29:42,814 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 46 [2020-08-21 17:29:42,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:29:42,814 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 17:29:42,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 17:29:42,814 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 17:29:42,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 17:29:42,818 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:29:42,818 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:29:42,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 17:29:42,819 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:29:42,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:29:42,820 INFO L82 PathProgramCache]: Analyzing trace with hash 927175243, now seen corresponding path program 12 times [2020-08-21 17:29:42,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:29:42,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1454835817] [2020-08-21 17:29:42,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:29:42,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:29:44,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:29:44,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:29:44,016 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:29:44,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1454835817] [2020-08-21 17:29:44,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:29:44,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 17:29:44,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884369135] [2020-08-21 17:29:44,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 17:29:44,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:29:44,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 17:29:44,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-21 17:29:44,018 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 29 states.