/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.1 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 03:10:06,273 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 03:10:06,276 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 03:10:06,317 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 03:10:06,319 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 03:10:06,327 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 03:10:06,329 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 03:10:06,333 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 03:10:06,336 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 03:10:06,339 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 03:10:06,340 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 03:10:06,341 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 03:10:06,341 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 03:10:06,345 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 03:10:06,347 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 03:10:06,349 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 03:10:06,351 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 03:10:06,352 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 03:10:06,353 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 03:10:06,364 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 03:10:06,366 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 03:10:06,367 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 03:10:06,368 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 03:10:06,369 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 03:10:06,381 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 03:10:06,381 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 03:10:06,382 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 03:10:06,383 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 03:10:06,383 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 03:10:06,388 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-22 03:10:06,399 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 03:10:06,400 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 03:10:06,401 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 03:10:06,402 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 [2020-08-22 03:10:06,441 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 03:10:06,442 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 03:10:06,444 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 03:10:06,444 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 03:10:06,444 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 03:10:06,445 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 03:10:06,445 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 03:10:06,445 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 03:10:06,445 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 03:10:06,445 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 03:10:06,447 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 03:10:06,447 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 03:10:06,447 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 03:10:06,447 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 03:10:06,448 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 03:10:06,448 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 03:10:06,448 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 03:10:06,448 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 03:10:06,448 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 03:10:06,449 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 03:10:06,449 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 03:10:06,449 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 03:10:06,449 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 03:10:06,449 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 03:10:06,450 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 03:10:06,450 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 03:10:06,450 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 03:10:06,450 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 03:10:06,450 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 03:10:06,450 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; [2020-08-22 03:10:06,722 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 03:10:06,739 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 03:10:06,743 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 03:10:06,744 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 03:10:06,745 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 03:10:06,746 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-22 03:10:06,810 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2dec69e17/2402a348c43746ae994778e35009ebc0/FLAG401eb70ad [2020-08-22 03:10:07,238 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 03:10:07,239 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-22 03:10:07,244 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2dec69e17/2402a348c43746ae994778e35009ebc0/FLAG401eb70ad [2020-08-22 03:10:07,638 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2dec69e17/2402a348c43746ae994778e35009ebc0 [2020-08-22 03:10:07,649 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 03:10:07,651 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 03:10:07,652 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 03:10:07,652 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 03:10:07,655 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 03:10:07,656 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:10:07" (1/1) ... [2020-08-22 03:10:07,659 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52d95357 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:07, skipping insertion in model container [2020-08-22 03:10:07,660 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:10:07" (1/1) ... [2020-08-22 03:10:07,667 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 03:10:07,688 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 03:10:07,913 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:10:07,919 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 03:10:07,935 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:10:07,951 INFO L208 MainTranslator]: Completed translation [2020-08-22 03:10:07,951 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:07 WrapperNode [2020-08-22 03:10:07,951 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 03:10:07,952 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 03:10:07,952 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 03:10:07,952 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 03:10:07,966 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:07" (1/1) ... [2020-08-22 03:10:07,966 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:07" (1/1) ... [2020-08-22 03:10:07,972 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:07" (1/1) ... [2020-08-22 03:10:07,972 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:07" (1/1) ... [2020-08-22 03:10:08,063 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:07" (1/1) ... [2020-08-22 03:10:08,071 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:07" (1/1) ... [2020-08-22 03:10:08,073 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:07" (1/1) ... [2020-08-22 03:10:08,074 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 03:10:08,075 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 03:10:08,075 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 03:10:08,075 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 03:10:08,076 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:07" (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 [2020-08-22 03:10:08,151 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 03:10:08,152 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 03:10:08,153 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 03:10:08,153 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 03:10:08,153 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 03:10:08,153 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 03:10:08,154 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 03:10:08,154 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 03:10:08,154 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 03:10:08,337 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 03:10:08,338 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 03:10:08,341 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:10:08 BoogieIcfgContainer [2020-08-22 03:10:08,341 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 03:10:08,343 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 03:10:08,343 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 03:10:08,346 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 03:10:08,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 03:10:07" (1/3) ... [2020-08-22 03:10:08,347 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f4c2e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:10:08, skipping insertion in model container [2020-08-22 03:10:08,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:07" (2/3) ... [2020-08-22 03:10:08,348 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f4c2e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:10:08, skipping insertion in model container [2020-08-22 03:10:08,348 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:10:08" (3/3) ... [2020-08-22 03:10:08,350 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-22 03:10:08,360 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 03:10:08,368 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 03:10:08,382 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 03:10:08,406 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 03:10:08,406 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 03:10:08,407 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 03:10:08,407 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 03:10:08,407 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 03:10:08,407 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 03:10:08,407 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 03:10:08,407 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 03:10:08,422 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-22 03:10:08,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-22 03:10:08,429 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:08,430 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:08,430 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:08,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:08,436 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-22 03:10:08,444 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:08,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174800594] [2020-08-22 03:10:08,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:08,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:08,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:08,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:08,670 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:08,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174800594] [2020-08-22 03:10:08,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:10:08,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 03:10:08,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647029290] [2020-08-22 03:10:08,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 03:10:08,681 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:08,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 03:10:08,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 03:10:08,700 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-22 03:10:08,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:08,769 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-22 03:10:08,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 03:10:08,777 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-22 03:10:08,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:08,797 INFO L225 Difference]: With dead ends: 29 [2020-08-22 03:10:08,797 INFO L226 Difference]: Without dead ends: 12 [2020-08-22 03:10:08,806 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 [2020-08-22 03:10:08,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-22 03:10:08,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-22 03:10:08,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-22 03:10:08,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-22 03:10:08,855 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-22 03:10:08,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:08,855 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-22 03:10:08,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 03:10:08,856 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-22 03:10:08,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-22 03:10:08,857 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:08,857 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:08,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 03:10:08,858 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:08,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:08,859 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-22 03:10:08,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:08,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [800930650] [2020-08-22 03:10:08,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:08,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:08,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:08,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:08,956 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:08,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [800930650] [2020-08-22 03:10:08,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:08,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-22 03:10:08,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046602087] [2020-08-22 03:10:08,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 03:10:08,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:08,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 03:10:08,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 03:10:08,961 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-22 03:10:08,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:08,988 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-22 03:10:08,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 03:10:08,989 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-22 03:10:08,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:08,990 INFO L225 Difference]: With dead ends: 18 [2020-08-22 03:10:08,990 INFO L226 Difference]: Without dead ends: 13 [2020-08-22 03:10:08,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 03:10:08,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-22 03:10:08,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-22 03:10:08,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-22 03:10:08,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-22 03:10:08,996 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-22 03:10:08,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:08,996 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-22 03:10:08,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 03:10:08,997 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-22 03:10:08,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 03:10:08,997 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:08,997 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:08,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 03:10:08,998 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:08,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:08,999 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-22 03:10:08,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:08,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [79286595] [2020-08-22 03:10:08,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:09,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:09,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:09,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:09,106 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:09,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [79286595] [2020-08-22 03:10:09,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:09,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 03:10:09,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512661410] [2020-08-22 03:10:09,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 03:10:09,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:09,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 03:10:09,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 03:10:09,109 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-22 03:10:09,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:09,134 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-22 03:10:09,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 03:10:09,135 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-22 03:10:09,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:09,136 INFO L225 Difference]: With dead ends: 19 [2020-08-22 03:10:09,136 INFO L226 Difference]: Without dead ends: 14 [2020-08-22 03:10:09,137 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 03:10:09,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-22 03:10:09,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-22 03:10:09,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-22 03:10:09,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-22 03:10:09,142 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-22 03:10:09,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:09,143 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-22 03:10:09,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 03:10:09,143 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-22 03:10:09,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 03:10:09,144 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:09,144 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:09,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 03:10:09,144 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:09,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:09,145 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-22 03:10:09,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:09,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [777492034] [2020-08-22 03:10:09,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:09,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:09,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:09,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:09,300 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:09,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [777492034] [2020-08-22 03:10:09,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:09,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 03:10:09,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128887527] [2020-08-22 03:10:09,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 03:10:09,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:09,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 03:10:09,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 03:10:09,303 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-22 03:10:09,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:09,335 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-22 03:10:09,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 03:10:09,336 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-22 03:10:09,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:09,337 INFO L225 Difference]: With dead ends: 20 [2020-08-22 03:10:09,337 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 03:10:09,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 03:10:09,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 03:10:09,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 03:10:09,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 03:10:09,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-22 03:10:09,343 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-22 03:10:09,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:09,343 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-22 03:10:09,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 03:10:09,343 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-22 03:10:09,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-22 03:10:09,344 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:09,344 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:09,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 03:10:09,345 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:09,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:09,345 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-22 03:10:09,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:09,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1243856333] [2020-08-22 03:10:09,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:09,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:09,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:09,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:09,454 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:09,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1243856333] [2020-08-22 03:10:09,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:09,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 03:10:09,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508359111] [2020-08-22 03:10:09,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 03:10:09,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:09,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 03:10:09,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 03:10:09,457 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-22 03:10:09,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:09,498 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-22 03:10:09,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 03:10:09,499 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-22 03:10:09,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:09,500 INFO L225 Difference]: With dead ends: 21 [2020-08-22 03:10:09,500 INFO L226 Difference]: Without dead ends: 16 [2020-08-22 03:10:09,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 03:10:09,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-22 03:10:09,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-22 03:10:09,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 03:10:09,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-22 03:10:09,507 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-22 03:10:09,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:09,507 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-22 03:10:09,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 03:10:09,507 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-22 03:10:09,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 03:10:09,508 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:09,509 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:09,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 03:10:09,509 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:09,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:09,510 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-22 03:10:09,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:09,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280305632] [2020-08-22 03:10:09,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:09,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:09,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:09,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:09,673 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:09,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [280305632] [2020-08-22 03:10:09,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:09,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 03:10:09,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924055642] [2020-08-22 03:10:09,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 03:10:09,675 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:09,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 03:10:09,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-22 03:10:09,675 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-22 03:10:09,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:09,726 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-22 03:10:09,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 03:10:09,727 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-22 03:10:09,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:09,728 INFO L225 Difference]: With dead ends: 22 [2020-08-22 03:10:09,728 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 03:10:09,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-22 03:10:09,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 03:10:09,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 03:10:09,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 03:10:09,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 03:10:09,734 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-22 03:10:09,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:09,734 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 03:10:09,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 03:10:09,735 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 03:10:09,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 03:10:09,735 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:09,735 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:09,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 03:10:09,736 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:09,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:09,736 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-22 03:10:09,737 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:09,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344675948] [2020-08-22 03:10:09,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:09,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:09,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:09,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:09,926 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:09,927 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344675948] [2020-08-22 03:10:09,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:09,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 03:10:09,928 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37001907] [2020-08-22 03:10:09,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 03:10:09,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:09,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 03:10:09,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-22 03:10:09,929 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-22 03:10:09,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:09,985 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-22 03:10:09,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 03:10:09,985 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-22 03:10:09,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:09,986 INFO L225 Difference]: With dead ends: 23 [2020-08-22 03:10:09,986 INFO L226 Difference]: Without dead ends: 18 [2020-08-22 03:10:09,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-22 03:10:09,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-22 03:10:09,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-22 03:10:09,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 03:10:09,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-22 03:10:09,992 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-22 03:10:09,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:09,992 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-22 03:10:09,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 03:10:09,993 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-22 03:10:09,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 03:10:09,993 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:09,994 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:09,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 03:10:09,994 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:09,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:09,994 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-22 03:10:09,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:09,995 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1778090204] [2020-08-22 03:10:09,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:10,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:10,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:10,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:10,140 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:10,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1778090204] [2020-08-22 03:10:10,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:10,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 03:10:10,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888823450] [2020-08-22 03:10:10,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 03:10:10,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:10,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 03:10:10,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-22 03:10:10,143 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-22 03:10:10,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:10,204 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-22 03:10:10,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 03:10:10,205 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-22 03:10:10,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:10,205 INFO L225 Difference]: With dead ends: 24 [2020-08-22 03:10:10,206 INFO L226 Difference]: Without dead ends: 19 [2020-08-22 03:10:10,206 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-22 03:10:10,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-22 03:10:10,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-22 03:10:10,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-22 03:10:10,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-22 03:10:10,211 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-22 03:10:10,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:10,211 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-22 03:10:10,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 03:10:10,212 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-22 03:10:10,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-22 03:10:10,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:10,213 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:10,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 03:10:10,213 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:10,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:10,213 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-22 03:10:10,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:10,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1551553278] [2020-08-22 03:10:10,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:10,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:10,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:10,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:10,382 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:10,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1551553278] [2020-08-22 03:10:10,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:10,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 03:10:10,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546469796] [2020-08-22 03:10:10,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 03:10:10,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:10,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 03:10:10,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-22 03:10:10,385 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-22 03:10:10,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:10,457 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-22 03:10:10,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 03:10:10,457 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-22 03:10:10,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:10,458 INFO L225 Difference]: With dead ends: 25 [2020-08-22 03:10:10,459 INFO L226 Difference]: Without dead ends: 20 [2020-08-22 03:10:10,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-22 03:10:10,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-22 03:10:10,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-22 03:10:10,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 03:10:10,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-22 03:10:10,465 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-22 03:10:10,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:10,465 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-22 03:10:10,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 03:10:10,466 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-22 03:10:10,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 03:10:10,466 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:10,467 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:10,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 03:10:10,467 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:10,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:10,468 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-22 03:10:10,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:10,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1190844256] [2020-08-22 03:10:10,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:10,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:10,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:10,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:10,675 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:10,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1190844256] [2020-08-22 03:10:10,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:10,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 03:10:10,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126986196] [2020-08-22 03:10:10,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 03:10:10,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:10,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 03:10:10,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-22 03:10:10,678 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-22 03:10:10,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:10,813 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-22 03:10:10,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 03:10:10,814 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-22 03:10:10,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:10,815 INFO L225 Difference]: With dead ends: 26 [2020-08-22 03:10:10,815 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 03:10:10,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-22 03:10:10,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 03:10:10,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-22 03:10:10,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-22 03:10:10,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-22 03:10:10,820 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-22 03:10:10,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:10,821 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-22 03:10:10,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 03:10:10,821 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-22 03:10:10,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-22 03:10:10,822 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:10,822 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:10,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 03:10:10,822 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:10,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:10,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-22 03:10:10,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:10,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005585094] [2020-08-22 03:10:10,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:10,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:10,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:10,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:10,996 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:10,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005585094] [2020-08-22 03:10:10,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:10,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 03:10:10,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045181507] [2020-08-22 03:10:10,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 03:10:10,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:10,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 03:10:10,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-22 03:10:10,998 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-22 03:10:11,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:11,124 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-22 03:10:11,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 03:10:11,127 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-22 03:10:11,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:11,128 INFO L225 Difference]: With dead ends: 27 [2020-08-22 03:10:11,128 INFO L226 Difference]: Without dead ends: 22 [2020-08-22 03:10:11,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-22 03:10:11,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-22 03:10:11,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-22 03:10:11,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-22 03:10:11,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-22 03:10:11,143 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-22 03:10:11,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:11,143 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-22 03:10:11,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 03:10:11,143 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-22 03:10:11,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 03:10:11,145 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:11,145 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:11,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 03:10:11,145 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:11,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:11,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-22 03:10:11,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:11,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [520020979] [2020-08-22 03:10:11,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:11,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:11,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:11,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:11,381 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:11,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [520020979] [2020-08-22 03:10:11,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:11,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 03:10:11,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559873799] [2020-08-22 03:10:11,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 03:10:11,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:11,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 03:10:11,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-22 03:10:11,385 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-22 03:10:11,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:11,517 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-22 03:10:11,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 03:10:11,518 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-22 03:10:11,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:11,519 INFO L225 Difference]: With dead ends: 28 [2020-08-22 03:10:11,519 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 03:10:11,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-22 03:10:11,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 03:10:11,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-22 03:10:11,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-22 03:10:11,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-22 03:10:11,527 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-22 03:10:11,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:11,530 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-22 03:10:11,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 03:10:11,530 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-22 03:10:11,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 03:10:11,531 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:11,531 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:11,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 03:10:11,532 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:11,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:11,532 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-22 03:10:11,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:11,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1882010056] [2020-08-22 03:10:11,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:11,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:11,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:11,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:11,795 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:11,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1882010056] [2020-08-22 03:10:11,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:11,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 03:10:11,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834989958] [2020-08-22 03:10:11,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 03:10:11,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:11,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 03:10:11,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-22 03:10:11,800 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-22 03:10:11,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:11,956 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-22 03:10:11,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 03:10:11,959 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-22 03:10:11,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:11,960 INFO L225 Difference]: With dead ends: 29 [2020-08-22 03:10:11,960 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 03:10:11,962 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-22 03:10:11,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 03:10:11,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-22 03:10:11,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 03:10:11,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-22 03:10:11,969 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-22 03:10:11,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:11,969 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-22 03:10:11,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 03:10:11,969 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-22 03:10:11,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 03:10:11,970 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:11,970 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:11,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 03:10:11,970 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:11,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:11,971 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-22 03:10:11,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:11,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1528033452] [2020-08-22 03:10:11,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:11,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:12,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:12,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:12,250 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:12,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1528033452] [2020-08-22 03:10:12,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:12,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 03:10:12,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185359575] [2020-08-22 03:10:12,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 03:10:12,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:12,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 03:10:12,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-22 03:10:12,253 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-22 03:10:12,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:12,394 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-22 03:10:12,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 03:10:12,394 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-22 03:10:12,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:12,395 INFO L225 Difference]: With dead ends: 30 [2020-08-22 03:10:12,395 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 03:10:12,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-22 03:10:12,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 03:10:12,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-22 03:10:12,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 03:10:12,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-22 03:10:12,401 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-22 03:10:12,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:12,401 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-22 03:10:12,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 03:10:12,401 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-22 03:10:12,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 03:10:12,402 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:12,402 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:12,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 03:10:12,403 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:12,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:12,403 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-22 03:10:12,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:12,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [154678614] [2020-08-22 03:10:12,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:12,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:12,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:12,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:12,674 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:12,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [154678614] [2020-08-22 03:10:12,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:12,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 03:10:12,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544912071] [2020-08-22 03:10:12,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 03:10:12,675 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:12,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 03:10:12,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-22 03:10:12,676 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-22 03:10:12,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:12,836 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-22 03:10:12,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 03:10:12,836 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-22 03:10:12,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:12,837 INFO L225 Difference]: With dead ends: 31 [2020-08-22 03:10:12,837 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 03:10:12,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-22 03:10:12,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 03:10:12,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-22 03:10:12,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 03:10:12,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-22 03:10:12,843 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-22 03:10:12,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:12,843 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-22 03:10:12,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 03:10:12,843 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-22 03:10:12,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 03:10:12,844 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:12,844 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:12,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 03:10:12,844 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:12,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:12,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-22 03:10:12,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:12,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1999265458] [2020-08-22 03:10:12,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:12,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:13,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:13,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:13,113 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:13,113 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1999265458] [2020-08-22 03:10:13,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:13,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 03:10:13,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695507956] [2020-08-22 03:10:13,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 03:10:13,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:13,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 03:10:13,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-22 03:10:13,119 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-22 03:10:13,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:13,299 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-22 03:10:13,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 03:10:13,300 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-22 03:10:13,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:13,301 INFO L225 Difference]: With dead ends: 32 [2020-08-22 03:10:13,301 INFO L226 Difference]: Without dead ends: 27 [2020-08-22 03:10:13,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-22 03:10:13,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-22 03:10:13,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-22 03:10:13,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-22 03:10:13,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-22 03:10:13,306 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-22 03:10:13,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:13,307 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-22 03:10:13,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 03:10:13,307 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-22 03:10:13,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-22 03:10:13,308 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:13,308 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:13,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 03:10:13,308 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:13,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:13,309 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-22 03:10:13,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:13,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [994678967] [2020-08-22 03:10:13,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:13,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:13,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:13,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:13,617 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:13,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [994678967] [2020-08-22 03:10:13,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:13,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 03:10:13,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073066550] [2020-08-22 03:10:13,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 03:10:13,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:13,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 03:10:13,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-22 03:10:13,619 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-22 03:10:13,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:13,810 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-22 03:10:13,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 03:10:13,811 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-22 03:10:13,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:13,812 INFO L225 Difference]: With dead ends: 33 [2020-08-22 03:10:13,812 INFO L226 Difference]: Without dead ends: 28 [2020-08-22 03:10:13,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-22 03:10:13,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-22 03:10:13,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-22 03:10:13,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 03:10:13,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-22 03:10:13,817 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-22 03:10:13,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:13,818 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-22 03:10:13,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 03:10:13,818 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-22 03:10:13,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 03:10:13,819 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:13,819 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:13,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 03:10:13,819 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:13,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:13,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-22 03:10:13,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:13,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1473126734] [2020-08-22 03:10:13,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:13,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:14,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:14,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:14,153 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:14,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1473126734] [2020-08-22 03:10:14,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:14,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 03:10:14,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236214335] [2020-08-22 03:10:14,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 03:10:14,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:14,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 03:10:14,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-22 03:10:14,155 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-22 03:10:14,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:14,391 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-22 03:10:14,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 03:10:14,392 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-22 03:10:14,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:14,393 INFO L225 Difference]: With dead ends: 34 [2020-08-22 03:10:14,393 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 03:10:14,394 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-22 03:10:14,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 03:10:14,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-22 03:10:14,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 03:10:14,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-22 03:10:14,399 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-22 03:10:14,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:14,399 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-22 03:10:14,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 03:10:14,400 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-22 03:10:14,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 03:10:14,400 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:14,400 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:14,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 03:10:14,401 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:14,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:14,401 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-22 03:10:14,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:14,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5811961] [2020-08-22 03:10:14,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:14,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:14,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:14,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:14,760 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:14,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5811961] [2020-08-22 03:10:14,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:14,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 03:10:14,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932529261] [2020-08-22 03:10:14,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 03:10:14,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:14,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 03:10:14,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-22 03:10:14,762 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-22 03:10:15,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:15,010 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-22 03:10:15,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 03:10:15,011 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-22 03:10:15,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:15,011 INFO L225 Difference]: With dead ends: 35 [2020-08-22 03:10:15,012 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 03:10:15,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-22 03:10:15,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 03:10:15,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-22 03:10:15,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 03:10:15,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-22 03:10:15,017 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-22 03:10:15,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:15,018 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-22 03:10:15,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 03:10:15,018 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-22 03:10:15,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 03:10:15,019 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:15,019 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:15,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 03:10:15,019 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:15,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:15,019 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-22 03:10:15,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:15,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [586670831] [2020-08-22 03:10:15,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:15,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:15,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:15,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:15,400 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:15,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [586670831] [2020-08-22 03:10:15,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:15,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 03:10:15,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725245721] [2020-08-22 03:10:15,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 03:10:15,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:15,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 03:10:15,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-22 03:10:15,403 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-22 03:10:15,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:15,672 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-22 03:10:15,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 03:10:15,678 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-22 03:10:15,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:15,679 INFO L225 Difference]: With dead ends: 36 [2020-08-22 03:10:15,679 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 03:10:15,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-22 03:10:15,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 03:10:15,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-22 03:10:15,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-22 03:10:15,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-22 03:10:15,686 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-22 03:10:15,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:15,687 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-22 03:10:15,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 03:10:15,689 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-22 03:10:15,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-22 03:10:15,690 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:15,690 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:15,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 03:10:15,690 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:15,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:15,691 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-22 03:10:15,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:15,691 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [637946666] [2020-08-22 03:10:15,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:15,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:16,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:16,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:16,114 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:16,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [637946666] [2020-08-22 03:10:16,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:16,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 03:10:16,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990148596] [2020-08-22 03:10:16,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 03:10:16,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:16,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 03:10:16,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-22 03:10:16,116 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-22 03:10:16,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:16,385 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-22 03:10:16,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 03:10:16,385 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-22 03:10:16,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:16,386 INFO L225 Difference]: With dead ends: 37 [2020-08-22 03:10:16,386 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 03:10:16,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-22 03:10:16,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 03:10:16,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-22 03:10:16,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 03:10:16,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-22 03:10:16,393 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-22 03:10:16,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:16,395 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-22 03:10:16,395 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 03:10:16,395 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-22 03:10:16,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 03:10:16,397 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:16,397 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:16,397 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 03:10:16,397 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:16,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:16,398 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-22 03:10:16,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:16,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423911260] [2020-08-22 03:10:16,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:16,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:16,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:16,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:16,886 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:16,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423911260] [2020-08-22 03:10:16,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:16,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 03:10:16,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137701414] [2020-08-22 03:10:16,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 03:10:16,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:16,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 03:10:16,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-22 03:10:16,888 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-22 03:10:17,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:17,199 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-22 03:10:17,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 03:10:17,201 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-22 03:10:17,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:17,202 INFO L225 Difference]: With dead ends: 38 [2020-08-22 03:10:17,202 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 03:10:17,206 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-22 03:10:17,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 03:10:17,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-22 03:10:17,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-22 03:10:17,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-22 03:10:17,215 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-22 03:10:17,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:17,215 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-22 03:10:17,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 03:10:17,216 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-22 03:10:17,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 03:10:17,216 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:17,216 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:17,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 03:10:17,219 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:17,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:17,219 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-22 03:10:17,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:17,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410298020] [2020-08-22 03:10:17,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:17,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:17,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:17,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:17,718 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:17,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410298020] [2020-08-22 03:10:17,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:17,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 03:10:17,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582224355] [2020-08-22 03:10:17,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 03:10:17,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:17,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 03:10:17,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-22 03:10:17,726 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-22 03:10:18,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:18,042 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-22 03:10:18,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 03:10:18,043 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-22 03:10:18,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:18,044 INFO L225 Difference]: With dead ends: 39 [2020-08-22 03:10:18,044 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 03:10:18,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-22 03:10:18,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 03:10:18,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-22 03:10:18,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 03:10:18,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-22 03:10:18,059 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-22 03:10:18,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:18,059 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-22 03:10:18,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 03:10:18,063 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-22 03:10:18,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 03:10:18,064 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:18,064 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:18,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 03:10:18,064 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:18,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:18,065 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-22 03:10:18,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:18,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244838129] [2020-08-22 03:10:18,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:18,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:18,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:18,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:18,571 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:18,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244838129] [2020-08-22 03:10:18,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:18,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 03:10:18,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983152792] [2020-08-22 03:10:18,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 03:10:18,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:18,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 03:10:18,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-22 03:10:18,575 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-22 03:10:18,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:18,953 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-22 03:10:18,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-22 03:10:18,953 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-22 03:10:18,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:18,954 INFO L225 Difference]: With dead ends: 40 [2020-08-22 03:10:18,954 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 03:10:18,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-22 03:10:18,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 03:10:18,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-22 03:10:18,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 03:10:18,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-22 03:10:18,960 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-22 03:10:18,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:18,961 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-22 03:10:18,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 03:10:18,961 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-22 03:10:18,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 03:10:18,962 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:18,962 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:18,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 03:10:18,962 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:18,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:18,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-22 03:10:18,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:18,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1355028938] [2020-08-22 03:10:18,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:18,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:19,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:19,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:19,562 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:19,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1355028938] [2020-08-22 03:10:19,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:19,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 03:10:19,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389612009] [2020-08-22 03:10:19,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 03:10:19,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:19,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 03:10:19,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-22 03:10:19,565 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-22 03:10:19,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:19,899 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-22 03:10:19,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 03:10:19,899 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-22 03:10:19,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:19,900 INFO L225 Difference]: With dead ends: 41 [2020-08-22 03:10:19,900 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 03:10:19,901 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-22 03:10:19,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 03:10:19,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-22 03:10:19,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 03:10:19,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-22 03:10:19,909 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-22 03:10:19,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:19,909 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-22 03:10:19,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 03:10:19,909 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-22 03:10:19,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 03:10:19,910 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:19,910 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:19,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 03:10:19,910 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:19,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:19,910 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-22 03:10:19,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:19,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [953186389] [2020-08-22 03:10:19,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:19,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:20,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:20,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:20,511 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:20,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [953186389] [2020-08-22 03:10:20,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:20,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 03:10:20,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914611925] [2020-08-22 03:10:20,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 03:10:20,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:20,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 03:10:20,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-22 03:10:20,513 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-22 03:10:20,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:20,936 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-22 03:10:20,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-22 03:10:20,937 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-22 03:10:20,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:20,937 INFO L225 Difference]: With dead ends: 42 [2020-08-22 03:10:20,938 INFO L226 Difference]: Without dead ends: 37 [2020-08-22 03:10:20,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-22 03:10:20,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-22 03:10:20,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-22 03:10:20,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 03:10:20,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-22 03:10:20,942 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-22 03:10:20,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:20,943 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-22 03:10:20,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 03:10:20,943 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-22 03:10:20,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 03:10:20,943 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:20,943 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:20,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 03:10:20,944 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:20,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:20,944 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-22 03:10:20,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:20,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694499450] [2020-08-22 03:10:20,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:20,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:21,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:21,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:21,549 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:21,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [694499450] [2020-08-22 03:10:21,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:21,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 03:10:21,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736373594] [2020-08-22 03:10:21,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 03:10:21,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:21,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 03:10:21,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-22 03:10:21,551 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-22 03:10:21,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:21,993 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-22 03:10:21,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-22 03:10:21,994 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-22 03:10:21,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:21,994 INFO L225 Difference]: With dead ends: 43 [2020-08-22 03:10:21,995 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 03:10:21,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-22 03:10:21,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 03:10:21,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-22 03:10:21,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 03:10:22,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-22 03:10:22,000 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-22 03:10:22,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:22,000 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-22 03:10:22,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 03:10:22,001 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-22 03:10:22,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 03:10:22,001 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:22,001 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:22,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 03:10:22,002 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:22,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:22,002 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-22 03:10:22,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:22,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [693685280] [2020-08-22 03:10:22,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:22,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:22,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:22,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:22,600 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:22,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [693685280] [2020-08-22 03:10:22,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:22,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 03:10:22,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103840273] [2020-08-22 03:10:22,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 03:10:22,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:22,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 03:10:22,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-22 03:10:22,603 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-22 03:10:23,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:23,080 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-22 03:10:23,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-22 03:10:23,081 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-22 03:10:23,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:23,082 INFO L225 Difference]: With dead ends: 44 [2020-08-22 03:10:23,082 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 03:10:23,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-22 03:10:23,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 03:10:23,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-22 03:10:23,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 03:10:23,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-22 03:10:23,091 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-22 03:10:23,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:23,091 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-22 03:10:23,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 03:10:23,091 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-22 03:10:23,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-22 03:10:23,092 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:23,092 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:23,092 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 03:10:23,092 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:23,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:23,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-22 03:10:23,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:23,093 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [510755853] [2020-08-22 03:10:23,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:23,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:23,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:23,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:23,817 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:23,818 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [510755853] [2020-08-22 03:10:23,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:23,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-22 03:10:23,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820085670] [2020-08-22 03:10:23,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-22 03:10:23,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:23,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-22 03:10:23,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-22 03:10:23,820 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-22 03:10:24,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:24,331 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-22 03:10:24,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-22 03:10:24,332 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-22 03:10:24,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:24,332 INFO L225 Difference]: With dead ends: 45 [2020-08-22 03:10:24,333 INFO L226 Difference]: Without dead ends: 40 [2020-08-22 03:10:24,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-22 03:10:24,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-22 03:10:24,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-22 03:10:24,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-22 03:10:24,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-22 03:10:24,337 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-22 03:10:24,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:24,338 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-22 03:10:24,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-22 03:10:24,338 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-22 03:10:24,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-22 03:10:24,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:24,339 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:24,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-22 03:10:24,339 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:24,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:24,340 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-22 03:10:24,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:24,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1495426145] [2020-08-22 03:10:24,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:24,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:25,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:25,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:25,089 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:25,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1495426145] [2020-08-22 03:10:25,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:25,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-22 03:10:25,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924738266] [2020-08-22 03:10:25,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-22 03:10:25,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:25,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-22 03:10:25,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-22 03:10:25,091 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-22 03:10:25,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:25,666 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-22 03:10:25,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 03:10:25,667 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-22 03:10:25,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:25,668 INFO L225 Difference]: With dead ends: 46 [2020-08-22 03:10:25,668 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 03:10:25,669 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-22 03:10:25,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 03:10:25,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-22 03:10:25,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 03:10:25,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-22 03:10:25,680 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-22 03:10:25,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:25,680 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-22 03:10:25,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-22 03:10:25,680 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-22 03:10:25,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 03:10:25,681 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:25,681 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:25,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-22 03:10:25,681 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:25,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:25,682 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-22 03:10:25,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:25,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [298255459] [2020-08-22 03:10:25,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:25,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:26,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:26,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:26,506 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:26,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [298255459] [2020-08-22 03:10:26,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:26,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 03:10:26,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148244750] [2020-08-22 03:10:26,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 03:10:26,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:26,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 03:10:26,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 03:10:26,509 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-22 03:10:27,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:27,155 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-22 03:10:27,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-22 03:10:27,155 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-22 03:10:27,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:27,156 INFO L225 Difference]: With dead ends: 47 [2020-08-22 03:10:27,156 INFO L226 Difference]: Without dead ends: 42 [2020-08-22 03:10:27,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 03:10:27,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-22 03:10:27,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-22 03:10:27,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 03:10:27,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-22 03:10:27,161 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-22 03:10:27,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:27,161 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-22 03:10:27,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 03:10:27,162 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-22 03:10:27,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 03:10:27,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:27,162 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:27,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-22 03:10:27,163 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:27,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:27,163 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-22 03:10:27,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:27,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1154751003] [2020-08-22 03:10:27,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:27,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:27,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:27,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:27,961 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:27,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1154751003] [2020-08-22 03:10:27,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:27,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-22 03:10:27,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312919107] [2020-08-22 03:10:27,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-22 03:10:27,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:27,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-22 03:10:27,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 03:10:27,962 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-22 03:10:28,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:28,643 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-22 03:10:28,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 03:10:28,644 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-22 03:10:28,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:28,645 INFO L225 Difference]: With dead ends: 48 [2020-08-22 03:10:28,645 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 03:10:28,646 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 03:10:28,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 03:10:28,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-22 03:10:28,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-22 03:10:28,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-22 03:10:28,651 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-22 03:10:28,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:28,652 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-22 03:10:28,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-22 03:10:28,652 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-22 03:10:28,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-22 03:10:28,652 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:28,652 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:28,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-22 03:10:28,654 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:28,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:28,654 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-22 03:10:28,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:28,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [326454172] [2020-08-22 03:10:28,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:28,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:29,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:29,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:29,534 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:29,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [326454172] [2020-08-22 03:10:29,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:29,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 03:10:29,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932365390] [2020-08-22 03:10:29,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 03:10:29,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:29,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 03:10:29,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 03:10:29,536 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-22 03:10:30,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:30,269 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-22 03:10:30,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-22 03:10:30,269 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-22 03:10:30,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:30,270 INFO L225 Difference]: With dead ends: 49 [2020-08-22 03:10:30,270 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 03:10:30,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 03:10:30,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 03:10:30,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-22 03:10:30,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 03:10:30,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-22 03:10:30,276 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-22 03:10:30,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:30,276 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-22 03:10:30,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 03:10:30,276 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-22 03:10:30,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 03:10:30,277 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:30,277 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:30,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-22 03:10:30,277 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:30,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:30,277 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-22 03:10:30,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:30,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142639570] [2020-08-22 03:10:30,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:30,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:31,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:31,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:31,261 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:31,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142639570] [2020-08-22 03:10:31,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:31,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-22 03:10:31,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313798301] [2020-08-22 03:10:31,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-22 03:10:31,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:31,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-22 03:10:31,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 03:10:31,263 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-22 03:10:32,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:32,032 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-22 03:10:32,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-22 03:10:32,032 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-22 03:10:32,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:32,033 INFO L225 Difference]: With dead ends: 50 [2020-08-22 03:10:32,033 INFO L226 Difference]: Without dead ends: 45 [2020-08-22 03:10:32,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 03:10:32,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-22 03:10:32,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-22 03:10:32,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-22 03:10:32,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-22 03:10:32,038 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-22 03:10:32,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:32,038 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-22 03:10:32,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-22 03:10:32,038 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-22 03:10:32,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 03:10:32,039 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:32,039 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:32,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-22 03:10:32,039 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:32,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:32,040 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-22 03:10:32,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:32,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196917611] [2020-08-22 03:10:32,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:32,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:33,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:33,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:33,023 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:33,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196917611] [2020-08-22 03:10:33,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:33,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 03:10:33,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509979284] [2020-08-22 03:10:33,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 03:10:33,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:33,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 03:10:33,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 03:10:33,025 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-22 03:10:33,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:33,831 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-22 03:10:33,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-22 03:10:33,833 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-22 03:10:33,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:33,834 INFO L225 Difference]: With dead ends: 51 [2020-08-22 03:10:33,834 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 03:10:33,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 03:10:33,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 03:10:33,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-22 03:10:33,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 03:10:33,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-22 03:10:33,838 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-22 03:10:33,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:33,839 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-22 03:10:33,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 03:10:33,839 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-22 03:10:33,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-22 03:10:33,839 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:33,840 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:33,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-22 03:10:33,840 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:33,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:33,840 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-22 03:10:33,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:33,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1590368107] [2020-08-22 03:10:33,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:33,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:34,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:34,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:34,875 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:34,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1590368107] [2020-08-22 03:10:34,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:34,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-22 03:10:34,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278812976] [2020-08-22 03:10:34,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-22 03:10:34,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:34,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-22 03:10:34,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 03:10:34,877 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-22 03:10:35,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:35,722 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-22 03:10:35,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 03:10:35,723 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-22 03:10:35,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:35,724 INFO L225 Difference]: With dead ends: 52 [2020-08-22 03:10:35,724 INFO L226 Difference]: Without dead ends: 47 [2020-08-22 03:10:35,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 03:10:35,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-22 03:10:35,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-22 03:10:35,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-22 03:10:35,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-22 03:10:35,729 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-22 03:10:35,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:35,729 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-22 03:10:35,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-22 03:10:35,729 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-22 03:10:35,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-22 03:10:35,730 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:35,730 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:35,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-22 03:10:35,730 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:35,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:35,731 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-22 03:10:35,731 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:35,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898139956] [2020-08-22 03:10:35,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:35,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:36,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:36,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:36,776 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:36,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898139956] [2020-08-22 03:10:36,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:36,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 03:10:36,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304659190] [2020-08-22 03:10:36,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 03:10:36,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:36,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 03:10:36,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 03:10:36,778 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-22 03:10:37,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:37,694 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-22 03:10:37,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-22 03:10:37,695 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-22 03:10:37,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:37,696 INFO L225 Difference]: With dead ends: 53 [2020-08-22 03:10:37,696 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 03:10:37,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 03:10:37,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 03:10:37,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-22 03:10:37,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 03:10:37,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-22 03:10:37,701 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-22 03:10:37,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:37,701 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-22 03:10:37,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 03:10:37,701 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-22 03:10:37,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-22 03:10:37,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:37,702 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:37,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-22 03:10:37,702 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:37,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:37,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-22 03:10:37,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:37,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282848174] [2020-08-22 03:10:37,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:37,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:38,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:38,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:38,825 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:38,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282848174] [2020-08-22 03:10:38,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:38,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-22 03:10:38,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621556508] [2020-08-22 03:10:38,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-22 03:10:38,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:38,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-22 03:10:38,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 03:10:38,828 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-22 03:10:39,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:39,782 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-22 03:10:39,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-22 03:10:39,783 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-22 03:10:39,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:39,784 INFO L225 Difference]: With dead ends: 54 [2020-08-22 03:10:39,784 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 03:10:39,785 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 03:10:39,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 03:10:39,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-22 03:10:39,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-22 03:10:39,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-22 03:10:39,789 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-22 03:10:39,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:39,790 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-22 03:10:39,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-22 03:10:39,790 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-22 03:10:39,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-22 03:10:39,791 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:39,791 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:39,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-22 03:10:39,791 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:39,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:39,791 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-22 03:10:39,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:39,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1676253258] [2020-08-22 03:10:39,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:39,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:40,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:40,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:40,994 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:40,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1676253258] [2020-08-22 03:10:40,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:40,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 03:10:40,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920531646] [2020-08-22 03:10:40,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 03:10:40,995 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:40,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 03:10:40,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 03:10:40,997 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-22 03:10:42,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:42,015 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-22 03:10:42,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-22 03:10:42,015 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-22 03:10:42,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:42,016 INFO L225 Difference]: With dead ends: 55 [2020-08-22 03:10:42,017 INFO L226 Difference]: Without dead ends: 50 [2020-08-22 03:10:42,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 03:10:42,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-22 03:10:42,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-22 03:10:42,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-22 03:10:42,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-22 03:10:42,022 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-22 03:10:42,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:42,022 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-22 03:10:42,022 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-22 03:10:42,022 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-22 03:10:42,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-22 03:10:42,023 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:42,023 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:42,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-22 03:10:42,023 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:42,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:42,024 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-22 03:10:42,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:42,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1864137430] [2020-08-22 03:10:42,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:42,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:43,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:43,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:43,526 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:43,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1864137430] [2020-08-22 03:10:43,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:43,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-22 03:10:43,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849486592] [2020-08-22 03:10:43,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-22 03:10:43,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:43,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-22 03:10:43,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 03:10:43,529 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-22 03:10:44,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:44,556 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-22 03:10:44,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-22 03:10:44,557 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-22 03:10:44,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:44,558 INFO L225 Difference]: With dead ends: 56 [2020-08-22 03:10:44,558 INFO L226 Difference]: Without dead ends: 51 [2020-08-22 03:10:44,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 03:10:44,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-22 03:10:44,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-22 03:10:44,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-22 03:10:44,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-22 03:10:44,562 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-22 03:10:44,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:44,562 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-22 03:10:44,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-22 03:10:44,562 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-22 03:10:44,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-22 03:10:44,563 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:44,563 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:44,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-22 03:10:44,563 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:44,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:44,563 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-22 03:10:44,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:44,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202166368] [2020-08-22 03:10:44,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:44,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:45,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:45,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:45,869 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:45,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [202166368] [2020-08-22 03:10:45,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:45,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-22 03:10:45,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317805444] [2020-08-22 03:10:45,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-22 03:10:45,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:45,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-22 03:10:45,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 03:10:45,871 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-22 03:10:47,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:47,035 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-22 03:10:47,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-22 03:10:47,036 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-22 03:10:47,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:47,037 INFO L225 Difference]: With dead ends: 57 [2020-08-22 03:10:47,037 INFO L226 Difference]: Without dead ends: 52 [2020-08-22 03:10:47,038 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 03:10:47,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-22 03:10:47,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-22 03:10:47,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 03:10:47,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-22 03:10:47,043 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-22 03:10:47,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:47,043 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-22 03:10:47,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-22 03:10:47,044 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-22 03:10:47,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-22 03:10:47,044 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:47,044 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:47,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-22 03:10:47,045 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:47,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:47,045 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-22 03:10:47,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:47,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104857903] [2020-08-22 03:10:47,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:47,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:48,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:48,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:48,381 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:48,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104857903] [2020-08-22 03:10:48,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:48,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-22 03:10:48,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914723543] [2020-08-22 03:10:48,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-22 03:10:48,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:48,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-22 03:10:48,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 03:10:48,383 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-22 03:10:49,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:49,581 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-22 03:10:49,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-22 03:10:49,582 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-22 03:10:49,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:49,583 INFO L225 Difference]: With dead ends: 58 [2020-08-22 03:10:49,583 INFO L226 Difference]: Without dead ends: 53 [2020-08-22 03:10:49,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 03:10:49,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-22 03:10:49,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-22 03:10:49,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-22 03:10:49,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-22 03:10:49,588 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-22 03:10:49,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:49,588 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-22 03:10:49,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-22 03:10:49,588 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-22 03:10:49,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-22 03:10:49,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:49,589 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:49,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-22 03:10:49,589 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:49,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:49,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-22 03:10:49,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:49,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291340646] [2020-08-22 03:10:49,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:49,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:51,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:51,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:51,078 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:51,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291340646] [2020-08-22 03:10:51,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:51,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-22 03:10:51,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780129418] [2020-08-22 03:10:51,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-22 03:10:51,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:51,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-22 03:10:51,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 03:10:51,080 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-22 03:10:52,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:52,330 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-22 03:10:52,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-22 03:10:52,332 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-22 03:10:52,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:52,333 INFO L225 Difference]: With dead ends: 59 [2020-08-22 03:10:52,333 INFO L226 Difference]: Without dead ends: 54 [2020-08-22 03:10:52,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 03:10:52,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-22 03:10:52,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-22 03:10:52,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 03:10:52,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-22 03:10:52,337 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-22 03:10:52,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:52,337 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-22 03:10:52,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-22 03:10:52,338 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-22 03:10:52,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-22 03:10:52,338 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:52,338 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:52,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-22 03:10:52,339 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:52,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:52,339 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-22 03:10:52,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:52,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [708809200] [2020-08-22 03:10:52,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:52,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:53,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:53,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:53,796 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:53,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [708809200] [2020-08-22 03:10:53,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:53,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-22 03:10:53,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039732717] [2020-08-22 03:10:53,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-22 03:10:53,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:53,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-22 03:10:53,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-22 03:10:53,799 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-22 03:10:55,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:55,139 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-22 03:10:55,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-22 03:10:55,140 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-22 03:10:55,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:55,141 INFO L225 Difference]: With dead ends: 60 [2020-08-22 03:10:55,141 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 03:10:55,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-22 03:10:55,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 03:10:55,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-22 03:10:55,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-22 03:10:55,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-22 03:10:55,145 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-22 03:10:55,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:55,145 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-22 03:10:55,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-22 03:10:55,145 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-22 03:10:55,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-22 03:10:55,145 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:55,145 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:55,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-22 03:10:55,146 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:55,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:55,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-22 03:10:55,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:55,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1052567574] [2020-08-22 03:10:55,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:55,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:56,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:56,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:56,657 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:56,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1052567574] [2020-08-22 03:10:56,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:56,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-22 03:10:56,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931336269] [2020-08-22 03:10:56,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-22 03:10:56,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:56,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-22 03:10:56,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 03:10:56,658 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-22 03:10:58,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:58,053 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-22 03:10:58,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-22 03:10:58,054 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-22 03:10:58,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:58,055 INFO L225 Difference]: With dead ends: 61 [2020-08-22 03:10:58,055 INFO L226 Difference]: Without dead ends: 56 [2020-08-22 03:10:58,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 03:10:58,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-22 03:10:58,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-22 03:10:58,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-22 03:10:58,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-22 03:10:58,060 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-22 03:10:58,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:58,060 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-22 03:10:58,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-22 03:10:58,061 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-22 03:10:58,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-22 03:10:58,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:58,061 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:58,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-22 03:10:58,062 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:58,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:58,062 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-22 03:10:58,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:58,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259434024] [2020-08-22 03:10:58,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:58,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:59,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:59,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:59,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:59,685 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259434024] [2020-08-22 03:10:59,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:59,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-22 03:10:59,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331911048] [2020-08-22 03:10:59,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-22 03:10:59,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:59,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-22 03:10:59,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-22 03:10:59,686 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-22 03:11:01,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:11:01,075 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-22 03:11:01,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-22 03:11:01,075 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-22 03:11:01,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:11:01,076 INFO L225 Difference]: With dead ends: 62 [2020-08-22 03:11:01,076 INFO L226 Difference]: Without dead ends: 57 [2020-08-22 03:11:01,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-22 03:11:01,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-22 03:11:01,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-22 03:11:01,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-22 03:11:01,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-22 03:11:01,082 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-22 03:11:01,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:11:01,082 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-22 03:11:01,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-22 03:11:01,083 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-22 03:11:01,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-22 03:11:01,083 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:11:01,083 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:11:01,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-22 03:11:01,084 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:11:01,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:11:01,090 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-22 03:11:01,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:11:01,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [968089159] [2020-08-22 03:11:01,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:11:01,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:11:02,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:11:02,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:11:02,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:11:02,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [968089159] [2020-08-22 03:11:02,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:11:02,760 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-22 03:11:02,760 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373361847] [2020-08-22 03:11:02,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-22 03:11:02,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:11:02,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-22 03:11:02,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-22 03:11:02,762 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-22 03:11:04,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:11:04,214 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-22 03:11:04,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-22 03:11:04,215 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-22 03:11:04,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:11:04,216 INFO L225 Difference]: With dead ends: 63 [2020-08-22 03:11:04,216 INFO L226 Difference]: Without dead ends: 58 [2020-08-22 03:11:04,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-22 03:11:04,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-22 03:11:04,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-22 03:11:04,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-22 03:11:04,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-22 03:11:04,221 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-22 03:11:04,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:11:04,222 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-22 03:11:04,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-22 03:11:04,222 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-22 03:11:04,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-22 03:11:04,222 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:11:04,222 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:11:04,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-22 03:11:04,223 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:11:04,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:11:04,223 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-22 03:11:04,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:11:04,224 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [356540857] [2020-08-22 03:11:04,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:11:04,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:11:05,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:11:05,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:11:05,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:11:05,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [356540857] [2020-08-22 03:11:05,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:11:05,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-22 03:11:05,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914257112] [2020-08-22 03:11:05,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-22 03:11:05,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:11:05,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-22 03:11:05,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-22 03:11:05,979 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states.