/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=LOWLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:09:45,458 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:09:45,460 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:09:45,484 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:09:45,485 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:09:45,486 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:09:45,487 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:09:45,489 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:09:45,491 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:09:45,491 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:09:45,492 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:09:45,494 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:09:45,494 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:09:45,495 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:09:45,496 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:09:45,497 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:09:45,498 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:09:45,499 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:09:45,501 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:09:45,505 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:09:45,507 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:09:45,511 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:09:45,514 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:09:45,515 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:09:45,520 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 18:09:45,520 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 18:09:45,520 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 18:09:45,523 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 18:09:45,524 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 18:09:45,525 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 18:09:45,525 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 18:09:45,526 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 18:09:45,528 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 18:09:45,529 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 18:09:45,531 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 18:09:45,531 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 18:09:45,532 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 18:09:45,532 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 18:09:45,533 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:09:45,534 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:09:45,536 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:09:45,536 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 18:09:45,582 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:09:45,583 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:09:45,585 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:09:45,585 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:09:45,585 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:09:45,585 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:09:45,586 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:09:45,586 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:09:45,586 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:09:45,586 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:09:45,587 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:09:45,588 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:09:45,588 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:09:45,588 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:09:45,589 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:09:45,589 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:09:45,589 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:09:45,589 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:09:45,589 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:09:45,590 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:09:45,590 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:09:45,590 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:09:45,590 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:09:45,591 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:09:45,591 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:09:45,591 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:09:45,591 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:09:45,591 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:09:45,591 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:09:45,592 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=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; [2020-08-21 18:09:45,855 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:09:45,867 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:09:45,870 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:09:45,872 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:09:45,872 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:09:45,873 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-21 18:09:45,934 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f18bf5566/c58fc07358f940aaa210f592c3a4dd85/FLAG666192a81 [2020-08-21 18:09:46,391 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:09:46,391 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-21 18:09:46,398 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f18bf5566/c58fc07358f940aaa210f592c3a4dd85/FLAG666192a81 [2020-08-21 18:09:46,779 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f18bf5566/c58fc07358f940aaa210f592c3a4dd85 [2020-08-21 18:09:46,789 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:09:46,791 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:09:46,792 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:09:46,792 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:09:46,795 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:09:46,795 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:09:46" (1/1) ... [2020-08-21 18:09:46,798 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8099dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:09:46, skipping insertion in model container [2020-08-21 18:09:46,798 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:09:46" (1/1) ... [2020-08-21 18:09:46,804 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:09:46,822 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:09:47,046 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:09:47,053 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:09:47,072 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:09:47,086 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:09:47,087 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:09:47 WrapperNode [2020-08-21 18:09:47,087 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:09:47,088 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:09:47,088 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:09:47,088 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:09:47,180 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:09:47" (1/1) ... [2020-08-21 18:09:47,180 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:09:47" (1/1) ... [2020-08-21 18:09:47,192 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:09:47" (1/1) ... [2020-08-21 18:09:47,193 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:09:47" (1/1) ... [2020-08-21 18:09:47,203 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:09:47" (1/1) ... [2020-08-21 18:09:47,209 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:09:47" (1/1) ... [2020-08-21 18:09:47,211 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:09:47" (1/1) ... [2020-08-21 18:09:47,213 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:09:47,214 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:09:47,214 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:09:47,214 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:09:47,215 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:09:47" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:09:47,276 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:09:47,276 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:09:47,276 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 18:09:47,277 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:09:47,277 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:09:47,277 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 18:09:47,277 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 18:09:47,278 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 18:09:47,278 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 18:09:47,279 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:09:47,279 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 18:09:47,279 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 18:09:47,279 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 18:09:47,280 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 18:09:47,280 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:09:47,281 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:09:47,626 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:09:47,627 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 18:09:47,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:09:47 BoogieIcfgContainer [2020-08-21 18:09:47,631 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:09:47,632 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:09:47,632 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:09:47,635 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:09:47,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:09:46" (1/3) ... [2020-08-21 18:09:47,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21a37226 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:09:47, skipping insertion in model container [2020-08-21 18:09:47,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:09:47" (2/3) ... [2020-08-21 18:09:47,637 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21a37226 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:09:47, skipping insertion in model container [2020-08-21 18:09:47,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:09:47" (3/3) ... [2020-08-21 18:09:47,639 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-21 18:09:47,650 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:09:47,657 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:09:47,671 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:09:47,692 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:09:47,692 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:09:47,693 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:09:47,693 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:09:47,693 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:09:47,693 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:09:47,693 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:09:47,693 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:09:47,709 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 18:09:47,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 18:09:47,714 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:09:47,715 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:09:47,715 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:09:47,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:09:47,720 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-21 18:09:47,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:09:47,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1528424035] [2020-08-21 18:09:47,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:09:47,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:47,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:09:47,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:47,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 18:09:47,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:47,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:09:47,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1528424035] [2020-08-21 18:09:47,933 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:09:47,933 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 18:09:47,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176536662] [2020-08-21 18:09:47,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 18:09:47,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:09:47,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 18:09:47,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 18:09:47,952 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 18:09:48,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:09:48,063 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-21 18:09:48,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 18:09:48,066 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 18:09:48,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:09:48,075 INFO L225 Difference]: With dead ends: 42 [2020-08-21 18:09:48,076 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 18:09:48,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 18:09:48,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 18:09:48,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 18:09:48,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 18:09:48,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 18:09:48,112 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-21 18:09:48,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:09:48,113 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 18:09:48,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 18:09:48,113 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 18:09:48,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 18:09:48,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:09:48,115 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:09:48,115 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:09:48,115 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:09:48,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:09:48,116 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-21 18:09:48,116 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:09:48,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [46800085] [2020-08-21 18:09:48,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:09:48,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:48,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:09:48,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:48,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 18:09:48,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:48,239 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:09:48,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [46800085] [2020-08-21 18:09:48,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:09:48,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 18:09:48,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781464670] [2020-08-21 18:09:48,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:09:48,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:09:48,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:09:48,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:09:48,243 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-21 18:09:48,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:09:48,310 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-21 18:09:48,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 18:09:48,310 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-21 18:09:48,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:09:48,312 INFO L225 Difference]: With dead ends: 34 [2020-08-21 18:09:48,312 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 18:09:48,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:09:48,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 18:09:48,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 18:09:48,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 18:09:48,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 18:09:48,320 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-21 18:09:48,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:09:48,321 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 18:09:48,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 18:09:48,321 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 18:09:48,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 18:09:48,322 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:09:48,322 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:09:48,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:09:48,323 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:09:48,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:09:48,323 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-21 18:09:48,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:09:48,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [586474654] [2020-08-21 18:09:48,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:09:48,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:48,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:09:48,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:48,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-21 18:09:48,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:48,408 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:09:48,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [586474654] [2020-08-21 18:09:48,408 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:09:48,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 18:09:48,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952225310] [2020-08-21 18:09:48,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:09:48,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:09:48,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:09:48,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:09:48,410 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-21 18:09:48,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:09:48,482 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-21 18:09:48,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:09:48,483 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-21 18:09:48,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:09:48,484 INFO L225 Difference]: With dead ends: 36 [2020-08-21 18:09:48,485 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 18:09:48,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:09:48,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 18:09:48,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 18:09:48,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 18:09:48,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 18:09:48,492 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-21 18:09:48,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:09:48,493 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 18:09:48,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:09:48,493 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 18:09:48,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 18:09:48,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:09:48,497 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:09:48,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:09:48,497 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:09:48,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:09:48,498 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-21 18:09:48,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:09:48,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [712181563] [2020-08-21 18:09:48,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:09:48,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:48,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:09:48,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:48,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-21 18:09:48,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:48,637 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:09:48,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [712181563] [2020-08-21 18:09:48,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:09:48,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 18:09:48,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792302071] [2020-08-21 18:09:48,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 18:09:48,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:09:48,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 18:09:48,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:09:48,640 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-21 18:09:48,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:09:48,739 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-21 18:09:48,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 18:09:48,740 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 18:09:48,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:09:48,741 INFO L225 Difference]: With dead ends: 38 [2020-08-21 18:09:48,741 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 18:09:48,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:09:48,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 18:09:48,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 18:09:48,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 18:09:48,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-21 18:09:48,748 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-21 18:09:48,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:09:48,748 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-21 18:09:48,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 18:09:48,748 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-21 18:09:48,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 18:09:48,749 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:09:48,750 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:09:48,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:09:48,750 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:09:48,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:09:48,751 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-21 18:09:48,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:09:48,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1883622700] [2020-08-21 18:09:48,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:09:48,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:48,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:09:48,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:48,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 18:09:48,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:48,848 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:09:48,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1883622700] [2020-08-21 18:09:48,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:09:48,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 18:09:48,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743186276] [2020-08-21 18:09:48,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:09:48,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:09:48,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:09:48,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:09:48,851 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-21 18:09:48,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:09:48,922 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-21 18:09:48,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:09:48,923 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-21 18:09:48,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:09:48,924 INFO L225 Difference]: With dead ends: 40 [2020-08-21 18:09:48,924 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 18:09:48,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:09:48,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 18:09:48,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 18:09:48,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 18:09:48,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 18:09:48,930 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-21 18:09:48,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:09:48,931 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 18:09:48,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:09:48,931 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 18:09:48,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 18:09:48,932 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:09:48,932 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:09:48,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:09:48,933 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:09:48,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:09:48,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-21 18:09:48,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:09:48,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1491618627] [2020-08-21 18:09:48,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:09:48,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:09:49,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 18:09:49,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,044 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:09:49,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1491618627] [2020-08-21 18:09:49,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:09:49,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 18:09:49,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940829939] [2020-08-21 18:09:49,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 18:09:49,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:09:49,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 18:09:49,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:09:49,047 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-21 18:09:49,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:09:49,109 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-21 18:09:49,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 18:09:49,110 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 18:09:49,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:09:49,111 INFO L225 Difference]: With dead ends: 42 [2020-08-21 18:09:49,111 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 18:09:49,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:09:49,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 18:09:49,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 18:09:49,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 18:09:49,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-21 18:09:49,117 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-21 18:09:49,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:09:49,118 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-21 18:09:49,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 18:09:49,118 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-21 18:09:49,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 18:09:49,119 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:09:49,119 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:09:49,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 18:09:49,120 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:09:49,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:09:49,120 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-21 18:09:49,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:09:49,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1941054173] [2020-08-21 18:09:49,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:09:49,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:09:49,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 18:09:49,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,232 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:09:49,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1941054173] [2020-08-21 18:09:49,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:09:49,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 18:09:49,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962742846] [2020-08-21 18:09:49,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 18:09:49,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:09:49,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 18:09:49,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:09:49,234 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-21 18:09:49,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:09:49,331 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-21 18:09:49,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 18:09:49,332 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 18:09:49,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:09:49,333 INFO L225 Difference]: With dead ends: 44 [2020-08-21 18:09:49,333 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 18:09:49,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:09:49,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 18:09:49,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 18:09:49,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 18:09:49,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-21 18:09:49,343 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-21 18:09:49,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:09:49,343 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-21 18:09:49,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 18:09:49,344 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-21 18:09:49,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 18:09:49,345 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:09:49,345 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:09:49,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 18:09:49,345 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:09:49,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:09:49,346 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-21 18:09:49,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:09:49,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1785613735] [2020-08-21 18:09:49,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:09:49,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:09:49,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 18:09:49,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,454 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:09:49,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1785613735] [2020-08-21 18:09:49,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:09:49,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 18:09:49,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892965392] [2020-08-21 18:09:49,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 18:09:49,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:09:49,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 18:09:49,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:09:49,457 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-21 18:09:49,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:09:49,549 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-21 18:09:49,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:09:49,550 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 18:09:49,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:09:49,551 INFO L225 Difference]: With dead ends: 46 [2020-08-21 18:09:49,551 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 18:09:49,552 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:09:49,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 18:09:49,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 18:09:49,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 18:09:49,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 18:09:49,558 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-21 18:09:49,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:09:49,558 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 18:09:49,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 18:09:49,559 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 18:09:49,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 18:09:49,560 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:09:49,560 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:09:49,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 18:09:49,560 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:09:49,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:09:49,561 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-21 18:09:49,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:09:49,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19196699] [2020-08-21 18:09:49,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:09:49,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:09:49,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 18:09:49,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,707 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:09:49,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19196699] [2020-08-21 18:09:49,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:09:49,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 18:09:49,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527428080] [2020-08-21 18:09:49,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 18:09:49,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:09:49,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 18:09:49,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:09:49,713 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 18:09:49,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:09:49,840 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 18:09:49,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 18:09:49,841 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 18:09:49,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:09:49,842 INFO L225 Difference]: With dead ends: 48 [2020-08-21 18:09:49,842 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 18:09:49,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:09:49,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 18:09:49,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 18:09:49,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 18:09:49,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-21 18:09:49,850 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-21 18:09:49,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:09:49,850 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-21 18:09:49,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 18:09:49,850 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-21 18:09:49,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 18:09:49,851 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:09:49,851 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:09:49,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 18:09:49,852 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:09:49,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:09:49,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-21 18:09:49,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:09:49,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279788847] [2020-08-21 18:09:49,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:09:49,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:09:49,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 18:09:49,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:49,980 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:09:49,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1279788847] [2020-08-21 18:09:49,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:09:49,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 18:09:49,982 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629415929] [2020-08-21 18:09:49,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 18:09:49,982 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:09:49,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 18:09:49,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:09:49,983 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-21 18:09:50,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:09:50,078 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-21 18:09:50,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 18:09:50,078 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 18:09:50,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:09:50,079 INFO L225 Difference]: With dead ends: 50 [2020-08-21 18:09:50,079 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 18:09:50,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:09:50,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 18:09:50,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 18:09:50,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 18:09:50,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-21 18:09:50,085 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-21 18:09:50,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:09:50,086 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-21 18:09:50,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 18:09:50,086 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-21 18:09:50,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 18:09:50,087 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:09:50,087 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:09:50,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 18:09:50,087 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:09:50,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:09:50,088 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-21 18:09:50,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:09:50,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1119821233] [2020-08-21 18:09:50,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:09:50,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:50,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:09:50,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:50,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 18:09:50,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:09:50,229 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:09:50,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1119821233] [2020-08-21 18:09:50,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:09:50,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 18:09:50,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197551779] [2020-08-21 18:09:50,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:09:50,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:09:50,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:09:50,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:09:50,232 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-21 18:09:50,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:09:50,326 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-21 18:09:50,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 18:09:50,326 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 18:09:50,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:09:50,327 INFO L225 Difference]: With dead ends: 51 [2020-08-21 18:09:50,327 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 18:09:50,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:09:50,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 18:09:50,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 18:09:50,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 18:09:50,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 18:09:50,333 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-21 18:09:50,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:09:50,334 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 18:09:50,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:09:50,334 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 18:09:50,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 18:09:50,335 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:09:50,335 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:09:50,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 18:09:50,336 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:09:50,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:09:50,336 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-21 18:09:50,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:09:50,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1327817560] [2020-08-21 18:09:50,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:09:50,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:10:00,567 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-21 18:10:01,658 WARN L193 SmtUtils]: Spent 879.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-21 18:10:06,001 WARN L193 SmtUtils]: Spent 3.96 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-21 18:10:33,974 WARN L193 SmtUtils]: Spent 27.05 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-21 18:10:34,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:10:34,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:10:34,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 18:10:34,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:10:34,344 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 18:10:34,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1327817560] [2020-08-21 18:10:34,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:10:34,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 18:10:34,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550662877] [2020-08-21 18:10:34,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 18:10:34,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:10:34,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 18:10:34,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:10:34,347 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-21 18:10:34,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:10:34,815 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 18:10:34,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 18:10:34,816 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-21 18:10:34,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:10:34,817 INFO L225 Difference]: With dead ends: 49 [2020-08-21 18:10:34,817 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 18:10:34,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.5s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:10:34,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 18:10:34,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 18:10:34,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 18:10:34,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-21 18:10:34,833 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-21 18:10:34,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:10:34,833 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-21 18:10:34,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 18:10:34,834 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-21 18:10:34,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 18:10:34,835 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:10:34,837 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:10:34,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 18:10:34,838 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:10:34,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:10:34,838 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-21 18:10:34,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:10:34,839 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1320899902] [2020-08-21 18:10:34,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:10:35,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:10:39,111 WARN L193 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-21 18:10:40,197 WARN L193 SmtUtils]: Spent 858.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-21 18:10:44,300 WARN L193 SmtUtils]: Spent 3.75 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-21 18:10:44,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:10:44,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:10:44,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 18:10:44,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:10:44,869 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 18:10:44,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1320899902] [2020-08-21 18:10:44,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:10:44,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 18:10:44,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660644845] [2020-08-21 18:10:44,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 18:10:44,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:10:44,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 18:10:44,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-21 18:10:44,871 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-21 18:10:45,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:10:45,816 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 18:10:45,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 18:10:45,817 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-21 18:10:45,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:10:45,820 INFO L225 Difference]: With dead ends: 48 [2020-08-21 18:10:45,820 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 18:10:45,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-21 18:10:45,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 18:10:45,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 18:10:45,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 18:10:45,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-21 18:10:45,830 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-21 18:10:45,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:10:45,830 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-21 18:10:45,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 18:10:45,830 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-21 18:10:45,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 18:10:45,831 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:10:45,831 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:10:45,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 18:10:45,831 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:10:45,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:10:45,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-21 18:10:45,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:10:45,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103410527] [2020-08-21 18:10:45,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:10:45,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat