/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 13:20:04,426 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 13:20:04,428 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 13:20:04,467 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 13:20:04,467 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 13:20:04,476 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 13:20:04,477 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 13:20:04,480 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 13:20:04,482 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 13:20:04,483 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 13:20:04,485 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 13:20:04,487 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 13:20:04,488 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 13:20:04,491 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 13:20:04,494 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 13:20:04,496 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 13:20:04,498 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 13:20:04,500 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 13:20:04,502 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 13:20:04,507 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 13:20:04,510 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 13:20:04,511 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 13:20:04,512 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 13:20:04,513 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 13:20:04,524 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 13:20:04,535 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 13:20:04,536 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 13:20:04,537 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 13:20:04,538 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 13:20:04,613 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 13:20:04,614 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 13:20:04,615 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 13:20:04,615 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 13:20:04,616 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 13:20:04,616 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 13:20:04,616 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 13:20:04,617 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 13:20:04,617 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 13:20:04,617 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 13:20:04,618 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 13:20:04,618 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 13:20:04,618 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 13:20:04,619 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 13:20:04,619 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 13:20:04,619 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 13:20:04,619 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 13:20:04,620 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 13:20:04,620 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 13:20:04,620 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 13:20:04,620 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 13:20:04,620 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 13:20:04,621 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 13:20:04,621 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 13:20:04,621 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 13:20:04,621 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 13:20:04,621 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 13:20:04,622 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 13:20:04,622 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 13:20:04,622 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 -> false [2020-08-21 13:20:04,911 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 13:20:04,929 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 13:20:04,933 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 13:20:04,934 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 13:20:04,934 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 13:20:04,935 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-21 13:20:05,015 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/462ac72bc/9e290ba754af416eb521b64332b026d5/FLAG2a454edfb [2020-08-21 13:20:05,493 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 13:20:05,494 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-21 13:20:05,499 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/462ac72bc/9e290ba754af416eb521b64332b026d5/FLAG2a454edfb [2020-08-21 13:20:05,863 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/462ac72bc/9e290ba754af416eb521b64332b026d5 [2020-08-21 13:20:05,872 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 13:20:05,874 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 13:20:05,875 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 13:20:05,875 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 13:20:05,879 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 13:20:05,880 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 01:20:05" (1/1) ... [2020-08-21 13:20:05,886 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3dbfc66d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:20:05, skipping insertion in model container [2020-08-21 13:20:05,886 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 01:20:05" (1/1) ... [2020-08-21 13:20:05,895 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 13:20:05,919 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 13:20:06,109 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 13:20:06,119 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 13:20:06,144 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 13:20:06,259 INFO L208 MainTranslator]: Completed translation [2020-08-21 13:20:06,260 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:20:06 WrapperNode [2020-08-21 13:20:06,260 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 13:20:06,261 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 13:20:06,261 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 13:20:06,261 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 13:20:06,273 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:20:06" (1/1) ... [2020-08-21 13:20:06,273 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:20:06" (1/1) ... [2020-08-21 13:20:06,283 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:20:06" (1/1) ... [2020-08-21 13:20:06,283 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:20:06" (1/1) ... [2020-08-21 13:20:06,302 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:20:06" (1/1) ... [2020-08-21 13:20:06,314 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:20:06" (1/1) ... [2020-08-21 13:20:06,316 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:20:06" (1/1) ... [2020-08-21 13:20:06,318 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 13:20:06,319 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 13:20:06,319 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 13:20:06,319 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 13:20:06,320 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:20:06" (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 13:20:06,388 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 13:20:06,389 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 13:20:06,389 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 13:20:06,389 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 13:20:06,389 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 13:20:06,389 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 13:20:06,390 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 13:20:06,390 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 13:20:06,390 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 13:20:06,390 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 13:20:06,390 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 13:20:06,390 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 13:20:06,391 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 13:20:06,391 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 13:20:06,391 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 13:20:06,391 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 13:20:06,729 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 13:20:06,730 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 13:20:06,734 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 01:20:06 BoogieIcfgContainer [2020-08-21 13:20:06,734 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 13:20:06,735 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 13:20:06,736 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 13:20:06,738 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 13:20:06,739 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 01:20:05" (1/3) ... [2020-08-21 13:20:06,740 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cc256f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 01:20:06, skipping insertion in model container [2020-08-21 13:20:06,740 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:20:06" (2/3) ... [2020-08-21 13:20:06,740 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cc256f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 01:20:06, skipping insertion in model container [2020-08-21 13:20:06,741 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 01:20:06" (3/3) ... [2020-08-21 13:20:06,742 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-21 13:20:06,753 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 13:20:06,760 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 13:20:06,773 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 13:20:06,798 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 13:20:06,798 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 13:20:06,798 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 13:20:06,798 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 13:20:06,800 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 13:20:06,800 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 13:20:06,800 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 13:20:06,800 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 13:20:06,821 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 13:20:06,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 13:20:06,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:06,828 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:06,828 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:06,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:06,834 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-21 13:20:06,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:06,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227559566] [2020-08-21 13:20:06,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:06,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:07,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:20:07,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:07,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 13:20:07,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:07,060 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 13:20:07,061 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227559566] [2020-08-21 13:20:07,064 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:20:07,064 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:20:07,065 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719911633] [2020-08-21 13:20:07,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:20:07,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:20:07,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:20:07,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:20:07,084 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 13:20:07,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:20:07,193 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-21 13:20:07,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:20:07,195 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 13:20:07,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:20:07,204 INFO L225 Difference]: With dead ends: 42 [2020-08-21 13:20:07,204 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 13:20:07,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 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 13:20:07,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 13:20:07,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 13:20:07,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 13:20:07,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 13:20:07,244 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-21 13:20:07,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:20:07,245 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 13:20:07,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:20:07,245 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 13:20:07,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 13:20:07,246 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:07,246 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:07,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 13:20:07,247 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:07,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:07,247 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-21 13:20:07,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:07,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [770809228] [2020-08-21 13:20:07,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:07,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:07,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:20:07,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:07,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 13:20:07,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:07,363 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 13:20:07,364 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [770809228] [2020-08-21 13:20:07,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:20:07,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 13:20:07,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224711653] [2020-08-21 13:20:07,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 13:20:07,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:20:07,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 13:20:07,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 13:20:07,375 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-21 13:20:07,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:20:07,484 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-21 13:20:07,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 13:20:07,485 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-21 13:20:07,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:20:07,486 INFO L225 Difference]: With dead ends: 34 [2020-08-21 13:20:07,486 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 13:20:07,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 13:20:07,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 13:20:07,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 13:20:07,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 13:20:07,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 13:20:07,504 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-21 13:20:07,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:20:07,505 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 13:20:07,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 13:20:07,507 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 13:20:07,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 13:20:07,508 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:07,509 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:07,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 13:20:07,509 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:07,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:07,510 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-21 13:20:07,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:07,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365407207] [2020-08-21 13:20:07,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:07,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:07,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:20:07,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:07,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-21 13:20:07,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:07,641 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:20:07,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365407207] [2020-08-21 13:20:07,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:20:07,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 13:20:07,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403051190] [2020-08-21 13:20:07,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 13:20:07,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:20:07,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 13:20:07,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 13:20:07,644 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-21 13:20:07,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:20:07,719 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-21 13:20:07,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 13:20:07,719 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-21 13:20:07,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:20:07,721 INFO L225 Difference]: With dead ends: 36 [2020-08-21 13:20:07,721 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 13:20:07,722 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 13:20:07,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 13:20:07,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 13:20:07,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 13:20:07,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 13:20:07,728 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-21 13:20:07,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:20:07,729 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 13:20:07,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 13:20:07,729 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 13:20:07,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 13:20:07,730 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:07,731 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:07,731 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 13:20:07,731 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:07,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:07,732 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-21 13:20:07,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:07,732 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1265727699] [2020-08-21 13:20:07,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:07,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:07,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:20:07,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:07,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-21 13:20:07,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:07,827 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:20:07,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1265727699] [2020-08-21 13:20:07,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:20:07,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 13:20:07,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157374568] [2020-08-21 13:20:07,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 13:20:07,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:20:07,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 13:20:07,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 13:20:07,830 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-21 13:20:07,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:20:07,919 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-21 13:20:07,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 13:20:07,920 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 13:20:07,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:20:07,921 INFO L225 Difference]: With dead ends: 38 [2020-08-21 13:20:07,921 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 13:20:07,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 13:20:07,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 13:20:07,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 13:20:07,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 13:20:07,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-21 13:20:07,928 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-21 13:20:07,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:20:07,929 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-21 13:20:07,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 13:20:07,929 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-21 13:20:07,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 13:20:07,930 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:07,930 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:07,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 13:20:07,931 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:07,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:07,931 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-21 13:20:07,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:07,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1801450714] [2020-08-21 13:20:07,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:07,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:08,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:20:08,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:08,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 13:20:08,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:08,024 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:20:08,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1801450714] [2020-08-21 13:20:08,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:20:08,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 13:20:08,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312555345] [2020-08-21 13:20:08,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 13:20:08,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:20:08,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 13:20:08,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 13:20:08,027 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-21 13:20:08,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:20:08,097 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-21 13:20:08,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 13:20:08,098 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-21 13:20:08,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:20:08,099 INFO L225 Difference]: With dead ends: 40 [2020-08-21 13:20:08,099 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 13:20:08,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 13:20:08,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 13:20:08,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 13:20:08,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 13:20:08,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 13:20:08,106 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-21 13:20:08,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:20:08,107 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 13:20:08,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 13:20:08,107 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 13:20:08,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 13:20:08,108 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:08,108 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:08,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 13:20:08,109 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:08,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:08,109 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-21 13:20:08,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:08,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [953048050] [2020-08-21 13:20:08,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:08,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:08,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:20:08,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:08,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 13:20:08,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:08,217 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:20:08,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [953048050] [2020-08-21 13:20:08,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:20:08,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 13:20:08,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677155686] [2020-08-21 13:20:08,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 13:20:08,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:20:08,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 13:20:08,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 13:20:08,220 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-21 13:20:08,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:20:08,293 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-21 13:20:08,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 13:20:08,294 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 13:20:08,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:20:08,295 INFO L225 Difference]: With dead ends: 42 [2020-08-21 13:20:08,295 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 13:20:08,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 13:20:08,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 13:20:08,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 13:20:08,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 13:20:08,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-21 13:20:08,302 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-21 13:20:08,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:20:08,302 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-21 13:20:08,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 13:20:08,302 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-21 13:20:08,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 13:20:08,303 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:08,303 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:08,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 13:20:08,304 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:08,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:08,304 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-21 13:20:08,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:08,305 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1836023899] [2020-08-21 13:20:08,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:08,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:08,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:20:08,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:08,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 13:20:08,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:08,413 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:20:08,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1836023899] [2020-08-21 13:20:08,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:20:08,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 13:20:08,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819323967] [2020-08-21 13:20:08,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 13:20:08,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:20:08,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 13:20:08,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 13:20:08,416 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-21 13:20:08,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:20:08,500 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-21 13:20:08,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 13:20:08,501 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 13:20:08,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:20:08,502 INFO L225 Difference]: With dead ends: 44 [2020-08-21 13:20:08,502 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 13:20:08,503 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 13:20:08,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 13:20:08,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 13:20:08,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 13:20:08,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-21 13:20:08,509 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-21 13:20:08,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:20:08,509 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-21 13:20:08,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 13:20:08,510 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-21 13:20:08,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 13:20:08,511 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:08,511 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:08,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 13:20:08,511 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:08,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:08,512 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-21 13:20:08,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:08,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [207931110] [2020-08-21 13:20:08,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:08,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:08,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:20:08,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:08,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 13:20:08,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:08,664 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:20:08,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [207931110] [2020-08-21 13:20:08,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:20:08,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 13:20:08,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650013063] [2020-08-21 13:20:08,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 13:20:08,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:20:08,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 13:20:08,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 13:20:08,667 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-21 13:20:08,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:20:08,788 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-21 13:20:08,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 13:20:08,788 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 13:20:08,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:20:08,790 INFO L225 Difference]: With dead ends: 46 [2020-08-21 13:20:08,790 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 13:20:08,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 13:20:08,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 13:20:08,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 13:20:08,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 13:20:08,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 13:20:08,801 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-21 13:20:08,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:20:08,801 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 13:20:08,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 13:20:08,802 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 13:20:08,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 13:20:08,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:08,804 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:08,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 13:20:08,804 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:08,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:08,805 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-21 13:20:08,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:08,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [185935886] [2020-08-21 13:20:08,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:08,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:09,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:20:09,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:09,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 13:20:09,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:09,021 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:20:09,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [185935886] [2020-08-21 13:20:09,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:20:09,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 13:20:09,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521163229] [2020-08-21 13:20:09,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 13:20:09,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:20:09,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 13:20:09,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 13:20:09,024 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 13:20:09,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:20:09,148 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 13:20:09,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 13:20:09,148 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 13:20:09,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:20:09,149 INFO L225 Difference]: With dead ends: 48 [2020-08-21 13:20:09,150 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 13:20:09,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 13:20:09,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 13:20:09,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 13:20:09,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 13:20:09,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-21 13:20:09,158 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-21 13:20:09,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:20:09,158 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-21 13:20:09,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 13:20:09,159 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-21 13:20:09,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 13:20:09,159 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:09,160 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:09,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 13:20:09,160 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:09,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:09,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-21 13:20:09,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:09,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073894594] [2020-08-21 13:20:09,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:09,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:09,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:20:09,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:09,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 13:20:09,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:09,318 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:20:09,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073894594] [2020-08-21 13:20:09,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:20:09,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 13:20:09,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324927726] [2020-08-21 13:20:09,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 13:20:09,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:20:09,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 13:20:09,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 13:20:09,322 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-21 13:20:09,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:20:09,412 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-21 13:20:09,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 13:20:09,413 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 13:20:09,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:20:09,414 INFO L225 Difference]: With dead ends: 50 [2020-08-21 13:20:09,414 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 13:20:09,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 13:20:09,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 13:20:09,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 13:20:09,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 13:20:09,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-21 13:20:09,423 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-21 13:20:09,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:20:09,425 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-21 13:20:09,425 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 13:20:09,425 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-21 13:20:09,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 13:20:09,428 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:09,428 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:09,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 13:20:09,428 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:09,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:09,431 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-21 13:20:09,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:09,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480652415] [2020-08-21 13:20:09,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:09,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:09,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:20:09,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:09,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 13:20:09,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:09,608 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:20:09,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480652415] [2020-08-21 13:20:09,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:20:09,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 13:20:09,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067808317] [2020-08-21 13:20:09,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 13:20:09,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:20:09,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 13:20:09,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 13:20:09,612 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-21 13:20:09,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:20:09,712 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-21 13:20:09,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 13:20:09,713 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 13:20:09,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:20:09,714 INFO L225 Difference]: With dead ends: 51 [2020-08-21 13:20:09,714 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 13:20:09,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 13:20:09,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 13:20:09,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 13:20:09,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 13:20:09,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 13:20:09,725 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-21 13:20:09,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:20:09,725 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 13:20:09,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 13:20:09,726 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 13:20:09,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 13:20:09,727 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:09,727 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:09,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 13:20:09,728 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:09,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:09,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-21 13:20:09,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:09,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [947135948] [2020-08-21 13:20:09,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:10,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:19,572 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-21 13:20:20,612 WARN L193 SmtUtils]: Spent 835.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-21 13:20:24,754 WARN L193 SmtUtils]: Spent 3.78 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-21 13:20:52,543 WARN L193 SmtUtils]: Spent 26.99 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-21 13:20:52,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:20:52,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:52,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 13:20:52,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:52,925 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 13:20:52,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [947135948] [2020-08-21 13:20:52,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:20:52,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 13:20:52,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482852992] [2020-08-21 13:20:52,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 13:20:52,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:20:52,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 13:20:52,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-21 13:20:52,928 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-21 13:20:53,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:20:53,383 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 13:20:53,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 13:20:53,384 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-21 13:20:53,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:20:53,385 INFO L225 Difference]: With dead ends: 49 [2020-08-21 13:20:53,385 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 13:20:53,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.1s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-21 13:20:53,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 13:20:53,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 13:20:53,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 13:20:53,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-21 13:20:53,397 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-21 13:20:53,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:20:53,397 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-21 13:20:53,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 13:20:53,397 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-21 13:20:53,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 13:20:53,400 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:20:53,400 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:20:53,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 13:20:53,401 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:20:53,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:20:53,401 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-21 13:20:53,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:20:53,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [671528257] [2020-08-21 13:20:53,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:20:53,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:20:57,429 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-21 13:20:58,480 WARN L193 SmtUtils]: Spent 866.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-21 13:21:02,621 WARN L193 SmtUtils]: Spent 3.80 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-21 13:21:03,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:21:03,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:21:03,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 13:21:03,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:21:03,233 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 13:21:03,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [671528257] [2020-08-21 13:21:03,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:21:03,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 13:21:03,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185111641] [2020-08-21 13:21:03,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 13:21:03,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:21:03,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 13:21:03,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-21 13:21:03,242 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-21 13:21:04,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:21:04,180 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 13:21:04,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 13:21:04,180 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-21 13:21:04,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:21:04,182 INFO L225 Difference]: With dead ends: 48 [2020-08-21 13:21:04,183 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 13:21:04,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-21 13:21:04,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 13:21:04,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 13:21:04,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 13:21:04,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-21 13:21:04,201 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-21 13:21:04,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:21:04,201 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-21 13:21:04,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 13:21:04,202 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-21 13:21:04,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 13:21:04,202 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:21:04,203 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:21:04,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 13:21:04,205 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:21:04,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:21:04,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-21 13:21:04,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:21:04,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1521906394] [2020-08-21 13:21:04,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:21:04,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat