/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.6 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 01:17:10,294 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-19 01:17:10,322 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 01:17:10,323 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 01:17:10,324 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 01:17:10,326 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 01:17:10,328 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 01:17:10,329 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 01:17:10,330 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 01:17:10,331 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 01:17:10,331 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 01:17:10,332 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 01:17:10,333 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 01:17:10,334 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 01:17:10,335 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 01:17:10,336 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 01:17:10,338 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 01:17:10,340 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 01:17:10,341 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 01:17:10,342 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 01:17:10,343 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 01:17:10,344 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 01:17:10,349 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 01:17:10,361 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 01:17:10,362 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 01:17:10,363 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 01:17:10,364 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 [2020-08-19 01:17:10,415 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 01:17:10,415 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 01:17:10,420 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 01:17:10,420 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 01:17:10,420 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 01:17:10,421 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 01:17:10,421 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 01:17:10,421 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 01:17:10,421 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 01:17:10,421 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 01:17:10,421 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 01:17:10,422 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 01:17:10,422 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 01:17:10,422 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 01:17:10,422 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 01:17:10,422 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 01:17:10,423 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 01:17:10,425 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 01:17:10,425 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 01:17:10,425 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 01:17:10,425 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 01:17:10,425 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 01:17:10,426 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 01:17:10,426 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 01:17:10,426 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 01:17:10,426 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 01:17:10,426 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 01:17:10,427 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 01:17:10,427 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 01:17:10,427 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6; [2020-08-19 01:17:10,755 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 01:17:10,766 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 01:17:10,770 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 01:17:10,771 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 01:17:10,771 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 01:17:10,772 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-19 01:17:10,830 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/344aef35d/da17f76539ee431b90036e5dd4b63fa8/FLAGdd47bc604 [2020-08-19 01:17:11,271 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 01:17:11,272 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-19 01:17:11,279 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/344aef35d/da17f76539ee431b90036e5dd4b63fa8/FLAGdd47bc604 [2020-08-19 01:17:11,674 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/344aef35d/da17f76539ee431b90036e5dd4b63fa8 [2020-08-19 01:17:11,684 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 01:17:11,686 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 01:17:11,687 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 01:17:11,687 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 01:17:11,691 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 01:17:11,692 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:17:11" (1/1) ... [2020-08-19 01:17:11,695 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12a6e9ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:17:11, skipping insertion in model container [2020-08-19 01:17:11,695 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:17:11" (1/1) ... [2020-08-19 01:17:11,703 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 01:17:11,725 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 01:17:11,915 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 01:17:11,919 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 01:17:11,934 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 01:17:11,947 INFO L208 MainTranslator]: Completed translation [2020-08-19 01:17:11,947 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:17:11 WrapperNode [2020-08-19 01:17:11,948 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 01:17:11,948 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 01:17:11,949 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 01:17:11,949 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 01:17:11,960 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:17:11" (1/1) ... [2020-08-19 01:17:11,961 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:17:11" (1/1) ... [2020-08-19 01:17:12,050 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:17:11" (1/1) ... [2020-08-19 01:17:12,051 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:17:11" (1/1) ... [2020-08-19 01:17:12,055 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:17:11" (1/1) ... [2020-08-19 01:17:12,060 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:17:11" (1/1) ... [2020-08-19 01:17:12,062 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:17:11" (1/1) ... [2020-08-19 01:17:12,063 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 01:17:12,064 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 01:17:12,064 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 01:17:12,064 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 01:17:12,065 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:17:11" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 01:17:12,128 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 01:17:12,128 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 01:17:12,128 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 01:17:12,129 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 01:17:12,129 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 01:17:12,129 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 01:17:12,129 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 01:17:12,129 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 01:17:12,129 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 01:17:12,130 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 01:17:12,130 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 01:17:12,130 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 01:17:12,130 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 01:17:12,358 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 01:17:12,358 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 01:17:12,362 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:17:12 BoogieIcfgContainer [2020-08-19 01:17:12,362 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 01:17:12,364 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 01:17:12,364 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 01:17:12,367 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 01:17:12,367 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 01:17:11" (1/3) ... [2020-08-19 01:17:12,368 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d062e9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:17:12, skipping insertion in model container [2020-08-19 01:17:12,368 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:17:11" (2/3) ... [2020-08-19 01:17:12,369 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d062e9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:17:12, skipping insertion in model container [2020-08-19 01:17:12,369 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:17:12" (3/3) ... [2020-08-19 01:17:12,371 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-19 01:17:12,383 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 01:17:12,390 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 01:17:12,407 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 01:17:12,442 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 01:17:12,443 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 01:17:12,443 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 01:17:12,443 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 01:17:12,443 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 01:17:12,444 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 01:17:12,444 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 01:17:12,444 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 01:17:12,469 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-19 01:17:12,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 01:17:12,477 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:12,479 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:12,479 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:12,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:12,487 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-19 01:17:12,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:12,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [50282122] [2020-08-19 01:17:12,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:12,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:12,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:12,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:12,633 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:12,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [50282122] [2020-08-19 01:17:12,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:17:12,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 01:17:12,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575557668] [2020-08-19 01:17:12,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 01:17:12,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:12,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 01:17:12,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 01:17:12,662 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-19 01:17:12,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:12,686 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-19 01:17:12,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 01:17:12,688 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-19 01:17:12,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:12,698 INFO L225 Difference]: With dead ends: 35 [2020-08-19 01:17:12,699 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 01:17:12,702 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 [2020-08-19 01:17:12,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 01:17:12,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 01:17:12,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 01:17:12,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 01:17:12,744 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-19 01:17:12,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:12,745 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 01:17:12,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 01:17:12,745 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 01:17:12,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 01:17:12,746 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:12,746 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:12,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 01:17:12,747 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:12,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:12,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-19 01:17:12,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:12,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1416213248] [2020-08-19 01:17:12,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:12,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:12,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:12,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:12,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:12,794 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1416213248] [2020-08-19 01:17:12,794 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:17:12,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 01:17:12,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177971480] [2020-08-19 01:17:12,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 01:17:12,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:12,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 01:17:12,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 01:17:12,798 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-19 01:17:12,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:12,831 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-19 01:17:12,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 01:17:12,832 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-19 01:17:12,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:12,833 INFO L225 Difference]: With dead ends: 24 [2020-08-19 01:17:12,833 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 01:17:12,834 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 [2020-08-19 01:17:12,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 01:17:12,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 01:17:12,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 01:17:12,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-19 01:17:12,839 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-19 01:17:12,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:12,839 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-19 01:17:12,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 01:17:12,840 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-19 01:17:12,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 01:17:12,840 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:12,841 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:12,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 01:17:12,841 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:12,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:12,842 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-19 01:17:12,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:12,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162640049] [2020-08-19 01:17:12,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:12,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:13,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:13,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:13,096 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:13,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162640049] [2020-08-19 01:17:13,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:17:13,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 01:17:13,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005182894] [2020-08-19 01:17:13,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 01:17:13,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:13,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 01:17:13,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 01:17:13,099 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-19 01:17:13,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:13,142 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-19 01:17:13,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 01:17:13,143 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-19 01:17:13,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:13,144 INFO L225 Difference]: With dead ends: 23 [2020-08-19 01:17:13,145 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 01:17:13,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 01:17:13,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 01:17:13,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 01:17:13,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 01:17:13,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-19 01:17:13,151 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-19 01:17:13,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:13,152 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-19 01:17:13,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 01:17:13,152 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-19 01:17:13,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 01:17:13,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:13,153 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:13,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 01:17:13,154 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:13,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:13,155 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-19 01:17:13,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:13,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807537964] [2020-08-19 01:17:13,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:13,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:13,394 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 15 [2020-08-19 01:17:13,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:13,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:13,403 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:13,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807537964] [2020-08-19 01:17:13,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:17:13,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 01:17:13,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209038939] [2020-08-19 01:17:13,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 01:17:13,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:13,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 01:17:13,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 01:17:13,410 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-19 01:17:13,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:13,438 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-19 01:17:13,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 01:17:13,440 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-19 01:17:13,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:13,441 INFO L225 Difference]: With dead ends: 26 [2020-08-19 01:17:13,441 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 01:17:13,442 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 [2020-08-19 01:17:13,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 01:17:13,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 01:17:13,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 01:17:13,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 01:17:13,452 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-19 01:17:13,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:13,452 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 01:17:13,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 01:17:13,454 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 01:17:13,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 01:17:13,457 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:13,457 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:13,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 01:17:13,458 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:13,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:13,458 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-19 01:17:13,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:13,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [783648436] [2020-08-19 01:17:13,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:13,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:13,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:13,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:13,730 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:13,730 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [783648436] [2020-08-19 01:17:13,730 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:13,731 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 01:17:13,731 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132254473] [2020-08-19 01:17:13,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 01:17:13,732 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:13,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 01:17:13,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-19 01:17:13,732 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-19 01:17:13,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:13,825 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 01:17:13,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 01:17:13,826 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-19 01:17:13,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:13,827 INFO L225 Difference]: With dead ends: 26 [2020-08-19 01:17:13,827 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 01:17:13,828 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-19 01:17:13,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 01:17:13,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 01:17:13,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 01:17:13,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-19 01:17:13,832 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-19 01:17:13,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:13,833 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-19 01:17:13,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 01:17:13,833 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-19 01:17:13,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 01:17:13,834 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:13,834 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:13,834 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 01:17:13,835 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:13,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:13,835 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-19 01:17:13,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:13,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2088469676] [2020-08-19 01:17:13,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:13,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:14,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:14,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:14,100 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:14,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2088469676] [2020-08-19 01:17:14,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:14,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 01:17:14,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853542850] [2020-08-19 01:17:14,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 01:17:14,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:14,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 01:17:14,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-19 01:17:14,106 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-19 01:17:14,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:14,282 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 01:17:14,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 01:17:14,282 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-19 01:17:14,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:14,283 INFO L225 Difference]: With dead ends: 29 [2020-08-19 01:17:14,283 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 01:17:14,284 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 [2020-08-19 01:17:14,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 01:17:14,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 01:17:14,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 01:17:14,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 01:17:14,291 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-19 01:17:14,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:14,297 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 01:17:14,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 01:17:14,297 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 01:17:14,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 01:17:14,298 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:14,298 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:14,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 01:17:14,299 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:14,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:14,300 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-19 01:17:14,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:14,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1248212081] [2020-08-19 01:17:14,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:14,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:14,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:14,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:14,591 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:14,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1248212081] [2020-08-19 01:17:14,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:14,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 01:17:14,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860699252] [2020-08-19 01:17:14,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 01:17:14,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:14,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 01:17:14,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-19 01:17:14,595 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-19 01:17:21,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:21,026 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 01:17:21,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 01:17:21,026 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-19 01:17:21,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:21,028 INFO L225 Difference]: With dead ends: 32 [2020-08-19 01:17:21,028 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 01:17:21,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=33, Invalid=147, Unknown=2, NotChecked=0, Total=182 [2020-08-19 01:17:21,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 01:17:21,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-19 01:17:21,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 01:17:21,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-19 01:17:21,040 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-19 01:17:21,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:21,041 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-19 01:17:21,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 01:17:21,041 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-19 01:17:21,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 01:17:21,044 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:21,044 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:21,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 01:17:21,045 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:21,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:21,045 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-19 01:17:21,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:21,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [706064985] [2020-08-19 01:17:21,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:21,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:21,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:21,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:21,443 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:21,443 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [706064985] [2020-08-19 01:17:21,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:21,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 01:17:21,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118037896] [2020-08-19 01:17:21,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 01:17:21,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:21,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 01:17:21,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-19 01:17:21,446 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-19 01:17:21,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:21,709 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-19 01:17:21,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 01:17:21,709 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-19 01:17:21,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:21,710 INFO L225 Difference]: With dead ends: 35 [2020-08-19 01:17:21,711 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 01:17:21,713 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 [2020-08-19 01:17:21,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 01:17:21,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 01:17:21,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 01:17:21,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 01:17:21,720 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-19 01:17:21,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:21,720 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 01:17:21,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 01:17:21,725 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 01:17:21,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 01:17:21,726 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:21,726 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:21,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 01:17:21,727 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:21,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:21,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-19 01:17:21,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:21,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566446801] [2020-08-19 01:17:21,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:21,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:22,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:22,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:22,167 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:22,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566446801] [2020-08-19 01:17:22,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:22,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 01:17:22,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311742728] [2020-08-19 01:17:22,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 01:17:22,171 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:22,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 01:17:22,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-19 01:17:22,172 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-19 01:17:26,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:26,719 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 01:17:26,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 01:17:26,719 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-19 01:17:26,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:26,720 INFO L225 Difference]: With dead ends: 38 [2020-08-19 01:17:26,720 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 01:17:26,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-08-19 01:17:26,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 01:17:26,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-19 01:17:26,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 01:17:26,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-19 01:17:26,729 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-19 01:17:26,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:26,730 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-19 01:17:26,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 01:17:26,730 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-19 01:17:26,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 01:17:26,731 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:26,731 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:26,731 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 01:17:26,732 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:26,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:26,732 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-19 01:17:26,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:26,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [132953182] [2020-08-19 01:17:26,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:26,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:27,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:27,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:27,195 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:27,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [132953182] [2020-08-19 01:17:27,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:27,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 01:17:27,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836742592] [2020-08-19 01:17:27,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 01:17:27,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:27,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 01:17:27,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-19 01:17:27,198 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-19 01:17:33,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:33,799 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-19 01:17:33,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 01:17:33,800 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-19 01:17:33,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:33,801 INFO L225 Difference]: With dead ends: 41 [2020-08-19 01:17:33,801 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 01:17:33,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-19 01:17:33,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 01:17:33,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 01:17:33,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 01:17:33,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 01:17:33,807 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-19 01:17:33,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:33,807 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 01:17:33,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 01:17:33,808 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 01:17:33,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 01:17:33,808 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:33,809 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:33,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 01:17:33,809 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:33,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:33,809 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-19 01:17:33,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:33,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837449554] [2020-08-19 01:17:33,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:33,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:34,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:34,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:34,358 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:34,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [837449554] [2020-08-19 01:17:34,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:34,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 01:17:34,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749191247] [2020-08-19 01:17:34,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 01:17:34,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:34,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 01:17:34,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-19 01:17:34,360 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-19 01:17:53,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:53,460 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 01:17:53,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 01:17:53,460 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-19 01:17:53,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:53,461 INFO L225 Difference]: With dead ends: 44 [2020-08-19 01:17:53,461 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 01:17:53,463 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 [2020-08-19 01:17:53,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 01:17:53,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 01:17:53,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 01:17:53,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-19 01:17:53,473 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-19 01:17:53,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:53,473 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-19 01:17:53,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 01:17:53,473 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-19 01:17:53,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 01:17:53,475 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:53,475 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:53,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 01:17:53,475 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:53,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:53,476 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-19 01:17:53,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:53,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511105808] [2020-08-19 01:17:53,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:53,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:54,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:54,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:54,136 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:54,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511105808] [2020-08-19 01:17:54,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:54,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 01:17:54,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26225863] [2020-08-19 01:17:54,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 01:17:54,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:54,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 01:17:54,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-19 01:17:54,138 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-19 01:17:56,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:56,674 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-19 01:17:56,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 01:17:56,674 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-19 01:17:56,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:56,675 INFO L225 Difference]: With dead ends: 47 [2020-08-19 01:17:56,676 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 01:17:56,677 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 [2020-08-19 01:17:56,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 01:17:56,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 01:17:56,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 01:17:56,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 01:17:56,681 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-19 01:17:56,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:56,682 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 01:17:56,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 01:17:56,682 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 01:17:56,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 01:17:56,683 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:56,683 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:56,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 01:17:56,683 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:56,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:56,684 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-19 01:17:56,684 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:56,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607962250] [2020-08-19 01:17:56,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:56,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:57,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:57,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:57,406 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:57,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607962250] [2020-08-19 01:17:57,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:57,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 01:17:57,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662928638] [2020-08-19 01:17:57,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 01:17:57,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:57,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 01:17:57,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-19 01:17:57,409 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-19 01:18:20,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:18:20,909 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 01:18:20,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 01:18:20,909 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-19 01:18:20,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:18:20,910 INFO L225 Difference]: With dead ends: 50 [2020-08-19 01:18:20,910 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 01:18:20,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=57, Invalid=589, Unknown=4, NotChecked=0, Total=650 [2020-08-19 01:18:20,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 01:18:20,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 01:18:20,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 01:18:20,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-19 01:18:20,915 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-19 01:18:20,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:18:20,916 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-19 01:18:20,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 01:18:20,916 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-19 01:18:20,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 01:18:20,917 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:18:20,917 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:18:20,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 01:18:20,918 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:18:20,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:18:20,918 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-19 01:18:20,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:18:20,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1193185594] [2020-08-19 01:18:20,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:18:20,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:18:21,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:18:21,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:18:21,841 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:18:21,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1193185594] [2020-08-19 01:18:21,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:18:21,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 01:18:21,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254133327] [2020-08-19 01:18:21,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 01:18:21,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:18:21,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 01:18:21,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-19 01:18:21,844 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states.