/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 17:59:52,147 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 17:59:52,150 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 17:59:52,190 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 17:59:52,191 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 17:59:52,200 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 17:59:52,202 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 17:59:52,206 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 17:59:52,208 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 17:59:52,213 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 17:59:52,214 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 17:59:52,214 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 17:59:52,215 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:59:52,217 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:59:52,220 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:59:52,222 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:59:52,223 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:59:52,224 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:59:52,225 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:59:52,234 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:59:52,236 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:59:52,237 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:59:52,238 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:59:52,239 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:59:52,252 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 17:59:52,252 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 17:59:52,252 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 17:59:52,256 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 17:59:52,257 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 17:59:52,257 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 17:59:52,261 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 17:59:52,262 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 17:59:52,262 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 17:59:52,263 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 17:59:52,266 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 17:59:52,266 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 17:59:52,267 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 17:59:52,267 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 17:59:52,267 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:59:52,268 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:59:52,271 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:59:52,272 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 [2020-08-18 17:59:52,293 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:59:52,294 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:59:52,295 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:59:52,295 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:59:52,295 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:59:52,296 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:59:52,296 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:59:52,296 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:59:52,296 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:59:52,296 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:59:52,297 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:59:52,297 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:59:52,297 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:59:52,297 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:59:52,297 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:59:52,298 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:59:52,298 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:59:52,298 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:59:52,298 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:59:52,298 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:59:52,299 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:59:52,299 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:59:52,299 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:59:52,299 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:59:52,299 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:59:52,300 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:59:52,300 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:59:52,300 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:59:52,300 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:59:52,300 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=BIGGEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=BIGGEST; [2020-08-18 17:59:52,609 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:59:52,629 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:59:52,635 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:59:52,643 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:59:52,644 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:59:52,645 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 17:59:52,709 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/834b94099/7165316adbd04f1eaa9a4ef70391d748/FLAGcfcc4b73b [2020-08-18 17:59:53,126 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:59:53,126 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 17:59:53,133 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/834b94099/7165316adbd04f1eaa9a4ef70391d748/FLAGcfcc4b73b [2020-08-18 17:59:53,520 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/834b94099/7165316adbd04f1eaa9a4ef70391d748 [2020-08-18 17:59:53,529 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:59:53,531 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:59:53,532 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:59:53,532 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:59:53,536 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:59:53,537 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:59:53" (1/1) ... [2020-08-18 17:59:53,540 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@445b6256 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:59:53, skipping insertion in model container [2020-08-18 17:59:53,541 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:59:53" (1/1) ... [2020-08-18 17:59:53,548 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:59:53,571 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:59:53,745 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:59:53,751 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:59:53,770 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:59:53,786 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:59:53,786 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:59:53 WrapperNode [2020-08-18 17:59:53,787 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:59:53,787 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:59:53,787 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:59:53,788 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:59:53,887 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:59:53" (1/1) ... [2020-08-18 17:59:53,888 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:59:53" (1/1) ... [2020-08-18 17:59:53,898 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:59:53" (1/1) ... [2020-08-18 17:59:53,899 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:59:53" (1/1) ... [2020-08-18 17:59:53,909 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:59:53" (1/1) ... [2020-08-18 17:59:53,915 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:59:53" (1/1) ... [2020-08-18 17:59:53,916 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:59:53" (1/1) ... [2020-08-18 17:59:53,919 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:59:53,919 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:59:53,919 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:59:53,920 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:59:53,920 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:59:53" (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 [2020-08-18 17:59:53,983 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:59:53,983 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:59:53,984 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 17:59:53,984 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-18 17:59:53,984 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:59:53,984 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:59:53,984 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 17:59:53,985 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 17:59:53,985 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-18 17:59:53,985 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 17:59:53,985 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 17:59:53,985 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 17:59:53,985 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:59:53,986 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 17:59:53,986 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 17:59:53,986 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 17:59:53,986 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:59:53,986 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:59:54,340 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:59:54,340 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 17:59:54,344 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:59:54 BoogieIcfgContainer [2020-08-18 17:59:54,345 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:59:54,346 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:59:54,346 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:59:54,349 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:59:54,349 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:59:53" (1/3) ... [2020-08-18 17:59:54,350 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@269a5013 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:59:54, skipping insertion in model container [2020-08-18 17:59:54,351 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:59:53" (2/3) ... [2020-08-18 17:59:54,351 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@269a5013 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:59:54, skipping insertion in model container [2020-08-18 17:59:54,351 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:59:54" (3/3) ... [2020-08-18 17:59:54,353 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-18 17:59:54,364 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:59:54,371 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 17:59:54,385 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 17:59:54,411 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:59:54,411 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:59:54,411 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:59:54,411 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:59:54,411 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:59:54,412 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:59:54,412 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:59:54,412 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:59:54,431 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-18 17:59:54,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 17:59:54,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:54,439 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] [2020-08-18 17:59:54,440 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:54,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:54,446 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-18 17:59:54,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:54,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581990163] [2020-08-18 17:59:54,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:54,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:54,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:54,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:54,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:54,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:54,702 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:59:54,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581990163] [2020-08-18 17:59:54,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:59:54,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:59:54,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778633230] [2020-08-18 17:59:54,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:59:54,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:54,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:59:54,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:59:54,726 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-18 17:59:54,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:54,900 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-18 17:59:54,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 17:59:54,902 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 17:59:54,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:54,914 INFO L225 Difference]: With dead ends: 59 [2020-08-18 17:59:54,914 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 17:59:54,918 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:59:54,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 17:59:54,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 17:59:54,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 17:59:54,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 17:59:54,964 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-18 17:59:54,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:54,964 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 17:59:54,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:59:54,965 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 17:59:54,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 17:59:54,966 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:54,966 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] [2020-08-18 17:59:54,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:59:54,967 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:54,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:54,967 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-18 17:59:54,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:54,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [127361423] [2020-08-18 17:59:54,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:54,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:55,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:55,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:55,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:55,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:55,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:59:55,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [127361423] [2020-08-18 17:59:55,134 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:59:55,134 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 17:59:55,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412563469] [2020-08-18 17:59:55,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:59:55,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:55,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:59:55,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:59:55,138 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 17:59:55,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:55,341 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-18 17:59:55,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:59:55,342 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-18 17:59:55,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:55,343 INFO L225 Difference]: With dead ends: 48 [2020-08-18 17:59:55,344 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 17:59:55,345 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:59:55,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 17:59:55,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 17:59:55,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 17:59:55,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-18 17:59:55,371 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-18 17:59:55,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:55,372 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-18 17:59:55,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:59:55,372 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-18 17:59:55,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 17:59:55,373 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:55,373 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, 1, 1] [2020-08-18 17:59:55,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:59:55,374 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:55,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:55,374 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-18 17:59:55,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:55,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1010136852] [2020-08-18 17:59:55,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:55,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:55,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:55,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:55,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:55,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:55,569 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:59:55,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1010136852] [2020-08-18 17:59:55,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:59:55,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 17:59:55,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896248102] [2020-08-18 17:59:55,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 17:59:55,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:55,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 17:59:55,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:59:55,572 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-18 17:59:55,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:55,736 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-18 17:59:55,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 17:59:55,737 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-18 17:59:55,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:55,738 INFO L225 Difference]: With dead ends: 50 [2020-08-18 17:59:55,738 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 17:59:55,739 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:59:55,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 17:59:55,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 17:59:55,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 17:59:55,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-18 17:59:55,746 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-18 17:59:55,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:55,747 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-18 17:59:55,747 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 17:59:55,747 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-18 17:59:55,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 17:59:55,748 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:55,749 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, 1, 1] [2020-08-18 17:59:55,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 17:59:55,749 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:55,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:55,750 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-18 17:59:55,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:55,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [546574746] [2020-08-18 17:59:55,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:55,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:55,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:55,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:55,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:55,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:56,056 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:59:56,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [546574746] [2020-08-18 17:59:56,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:59:56,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 17:59:56,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609942950] [2020-08-18 17:59:56,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 17:59:56,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:56,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 17:59:56,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:59:56,061 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-18 17:59:56,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:56,216 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-18 17:59:56,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 17:59:56,217 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-18 17:59:56,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:56,218 INFO L225 Difference]: With dead ends: 52 [2020-08-18 17:59:56,218 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 17:59:56,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:59:56,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 17:59:56,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 17:59:56,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 17:59:56,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-18 17:59:56,225 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-18 17:59:56,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:56,225 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-18 17:59:56,225 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 17:59:56,226 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-18 17:59:56,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 17:59:56,227 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:56,227 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, 1, 1] [2020-08-18 17:59:56,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 17:59:56,227 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:56,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:56,228 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-18 17:59:56,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:56,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282197472] [2020-08-18 17:59:56,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:56,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:56,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:56,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:56,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:56,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:56,462 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:59:56,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282197472] [2020-08-18 17:59:56,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:59:56,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 17:59:56,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530126121] [2020-08-18 17:59:56,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 17:59:56,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:56,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 17:59:56,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:59:56,479 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-18 17:59:56,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:56,680 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-18 17:59:56,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 17:59:56,680 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-18 17:59:56,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:56,681 INFO L225 Difference]: With dead ends: 54 [2020-08-18 17:59:56,682 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 17:59:56,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-18 17:59:56,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 17:59:56,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 17:59:56,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 17:59:56,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-18 17:59:56,696 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-18 17:59:56,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:56,697 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-18 17:59:56,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 17:59:56,697 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-18 17:59:56,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 17:59:56,698 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:56,699 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, 1, 1] [2020-08-18 17:59:56,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 17:59:56,699 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:56,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:56,700 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-18 17:59:56,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:56,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [317813580] [2020-08-18 17:59:56,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:56,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:56,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:56,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:56,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:56,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:57,010 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:59:57,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [317813580] [2020-08-18 17:59:57,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:59:57,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 17:59:57,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091080383] [2020-08-18 17:59:57,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 17:59:57,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:57,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 17:59:57,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:59:57,013 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-18 17:59:57,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:57,189 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-18 17:59:57,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 17:59:57,190 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-18 17:59:57,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:57,191 INFO L225 Difference]: With dead ends: 56 [2020-08-18 17:59:57,191 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 17:59:57,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:59:57,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 17:59:57,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 17:59:57,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 17:59:57,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-18 17:59:57,198 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-18 17:59:57,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:57,198 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-18 17:59:57,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 17:59:57,199 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-18 17:59:57,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 17:59:57,200 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:57,200 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, 1, 1] [2020-08-18 17:59:57,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 17:59:57,200 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:57,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:57,201 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-18 17:59:57,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:57,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67062417] [2020-08-18 17:59:57,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:57,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:57,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:57,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:57,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:57,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:57,490 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:59:57,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67062417] [2020-08-18 17:59:57,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:59:57,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 17:59:57,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300049971] [2020-08-18 17:59:57,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 17:59:57,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:57,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 17:59:57,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:59:57,492 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-18 17:59:57,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:57,684 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-18 17:59:57,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 17:59:57,685 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 17:59:57,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:57,686 INFO L225 Difference]: With dead ends: 58 [2020-08-18 17:59:57,686 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 17:59:57,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-18 17:59:57,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 17:59:57,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 17:59:57,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 17:59:57,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 17:59:57,692 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-18 17:59:57,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:57,693 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 17:59:57,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 17:59:57,693 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 17:59:57,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 17:59:57,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:57,694 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, 1, 1] [2020-08-18 17:59:57,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 17:59:57,695 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:57,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:57,695 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-18 17:59:57,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:57,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [195755338] [2020-08-18 17:59:57,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:57,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:57,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:57,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:57,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:57,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:58,010 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:59:58,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [195755338] [2020-08-18 17:59:58,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:59:58,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 17:59:58,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655058168] [2020-08-18 17:59:58,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 17:59:58,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:58,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 17:59:58,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-18 17:59:58,013 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-18 17:59:58,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:58,251 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-18 17:59:58,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 17:59:58,252 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-18 17:59:58,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:58,253 INFO L225 Difference]: With dead ends: 60 [2020-08-18 17:59:58,253 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 17:59:58,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:59:58,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 17:59:58,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 17:59:58,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 17:59:58,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 17:59:58,259 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-18 17:59:58,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:58,259 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 17:59:58,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 17:59:58,260 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 17:59:58,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 17:59:58,261 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:58,261 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, 1, 1] [2020-08-18 17:59:58,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 17:59:58,261 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:58,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:58,262 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-18 17:59:58,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:58,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827233851] [2020-08-18 17:59:58,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:58,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:58,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:58,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:58,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:58,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:58,583 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:59:58,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827233851] [2020-08-18 17:59:58,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:59:58,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 17:59:58,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660701906] [2020-08-18 17:59:58,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 17:59:58,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:58,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 17:59:58,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:59:58,585 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-18 17:59:58,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:58,764 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-18 17:59:58,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 17:59:58,764 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-18 17:59:58,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:58,765 INFO L225 Difference]: With dead ends: 62 [2020-08-18 17:59:58,765 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 17:59:58,766 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-18 17:59:58,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 17:59:58,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 17:59:58,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 17:59:58,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-18 17:59:58,772 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-18 17:59:58,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:58,772 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-18 17:59:58,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 17:59:58,772 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-18 17:59:58,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 17:59:58,773 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:58,773 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, 1, 1] [2020-08-18 17:59:58,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 17:59:58,774 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:58,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:58,774 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-18 17:59:58,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:58,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1610536033] [2020-08-18 17:59:58,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:58,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:58,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:58,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:58,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:58,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:59,178 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:59:59,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1610536033] [2020-08-18 17:59:59,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:59:59,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 17:59:59,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692529926] [2020-08-18 17:59:59,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 17:59:59,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:59,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 17:59:59,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-18 17:59:59,181 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-18 17:59:59,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:59,390 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-18 17:59:59,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 17:59:59,391 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 17:59:59,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:59,392 INFO L225 Difference]: With dead ends: 64 [2020-08-18 17:59:59,392 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 17:59:59,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-18 17:59:59,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 17:59:59,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 17:59:59,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 17:59:59,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-18 17:59:59,402 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-18 17:59:59,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:59,402 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-18 17:59:59,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 17:59:59,402 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-18 17:59:59,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 17:59:59,404 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:59,404 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, 1, 1] [2020-08-18 17:59:59,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 17:59:59,405 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:59,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:59,405 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-18 17:59:59,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:59,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029647814] [2020-08-18 17:59:59,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:59,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:59,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:59,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:59,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:59,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:59,467 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 17:59:59,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029647814] [2020-08-18 17:59:59,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:59:59,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 17:59:59,469 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052955195] [2020-08-18 17:59:59,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:59:59,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:59,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:59:59,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:59:59,470 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-18 17:59:59,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:59,550 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-18 17:59:59,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:59:59,550 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-18 17:59:59,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:59,552 INFO L225 Difference]: With dead ends: 65 [2020-08-18 17:59:59,552 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 17:59:59,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:59:59,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 17:59:59,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-18 17:59:59,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 17:59:59,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-18 17:59:59,563 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-18 17:59:59,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:59,563 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-18 17:59:59,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:59:59,563 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-18 17:59:59,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 17:59:59,564 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:59,564 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, 1, 1, 1, 1, 1] [2020-08-18 17:59:59,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 17:59:59,565 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:59,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:59,565 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-18 17:59:59,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:59,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [469887045] [2020-08-18 17:59:59,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:59,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:59,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:59,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:59,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:59,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:59,629 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 17:59:59,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [469887045] [2020-08-18 17:59:59,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:59:59,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 17:59:59,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644419153] [2020-08-18 17:59:59,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:59:59,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:59,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:59:59,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:59:59,631 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-18 17:59:59,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:59,743 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-18 17:59:59,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:59:59,744 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-18 17:59:59,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:59,745 INFO L225 Difference]: With dead ends: 73 [2020-08-18 17:59:59,745 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 17:59:59,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:59:59,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 17:59:59,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-18 17:59:59,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 17:59:59,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-18 17:59:59,756 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-18 17:59:59,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:59,758 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-18 17:59:59,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:59:59,758 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-18 17:59:59,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 17:59:59,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:59,761 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:59:59,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 17:59:59,762 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:59,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:59,762 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-18 17:59:59,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:59,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831888786] [2020-08-18 17:59:59,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:59,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:59,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:59:59,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:59,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 17:59:59,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:59:59,843 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-18 17:59:59,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831888786] [2020-08-18 17:59:59,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:59:59,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 17:59:59,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807028787] [2020-08-18 17:59:59,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:59:59,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:59:59,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:59:59,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:59:59,846 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-18 17:59:59,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:59:59,924 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-18 17:59:59,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:59:59,925 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-18 17:59:59,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:59:59,926 INFO L225 Difference]: With dead ends: 69 [2020-08-18 17:59:59,926 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 17:59:59,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:59:59,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 17:59:59,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 17:59:59,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 17:59:59,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-18 17:59:59,938 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-18 17:59:59,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:59:59,939 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-18 17:59:59,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:59:59,939 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-18 17:59:59,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 17:59:59,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:59:59,944 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:59:59,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 17:59:59,944 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:59:59,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:59:59,945 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-18 17:59:59,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:59:59,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1164821434] [2020-08-18 17:59:59,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:59:59,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:00,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:00,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:00,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:00,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:00,473 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:00,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1164821434] [2020-08-18 18:00:00,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:00,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 18:00:00,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906790990] [2020-08-18 18:00:00,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 18:00:00,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:00,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 18:00:00,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-18 18:00:00,485 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-18 18:00:00,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:00,728 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-18 18:00:00,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 18:00:00,729 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-18 18:00:00,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:00,730 INFO L225 Difference]: With dead ends: 74 [2020-08-18 18:00:00,730 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 18:00:00,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:00:00,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 18:00:00,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 18:00:00,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 18:00:00,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-18 18:00:00,736 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-18 18:00:00,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:00,737 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-18 18:00:00,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 18:00:00,737 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-18 18:00:00,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 18:00:00,738 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:00,738 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:00,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 18:00:00,738 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:00,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:00,739 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-18 18:00:00,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:00,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557597967] [2020-08-18 18:00:00,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:00,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:00,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:00,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:00,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:00,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:01,242 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:01,242 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557597967] [2020-08-18 18:00:01,242 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:01,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 18:00:01,243 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936583521] [2020-08-18 18:00:01,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 18:00:01,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:01,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 18:00:01,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:00:01,245 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-18 18:00:01,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:01,459 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-18 18:00:01,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 18:00:01,460 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-18 18:00:01,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:01,460 INFO L225 Difference]: With dead ends: 76 [2020-08-18 18:00:01,460 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 18:00:01,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:00:01,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 18:00:01,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 18:00:01,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 18:00:01,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-18 18:00:01,476 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-18 18:00:01,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:01,476 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-18 18:00:01,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 18:00:01,476 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-18 18:00:01,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 18:00:01,477 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:01,477 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:01,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 18:00:01,478 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:01,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:01,478 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-18 18:00:01,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:01,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [857834921] [2020-08-18 18:00:01,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:01,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:01,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:01,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:01,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:01,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:02,017 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:02,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [857834921] [2020-08-18 18:00:02,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:02,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 18:00:02,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977938516] [2020-08-18 18:00:02,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 18:00:02,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:02,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 18:00:02,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-18 18:00:02,022 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-18 18:00:02,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:02,256 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-18 18:00:02,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 18:00:02,256 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 18:00:02,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:02,258 INFO L225 Difference]: With dead ends: 78 [2020-08-18 18:00:02,258 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 18:00:02,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:00:02,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 18:00:02,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 18:00:02,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 18:00:02,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-18 18:00:02,273 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-18 18:00:02,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:02,273 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-18 18:00:02,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 18:00:02,273 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-18 18:00:02,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 18:00:02,274 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:02,274 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:02,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 18:00:02,275 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:02,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:02,275 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-18 18:00:02,275 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:02,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839425455] [2020-08-18 18:00:02,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:02,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:02,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:02,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:02,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:02,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:02,870 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:02,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839425455] [2020-08-18 18:00:02,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:02,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 18:00:02,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756596599] [2020-08-18 18:00:02,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 18:00:02,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:02,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 18:00:02,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:00:02,873 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-18 18:00:03,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:03,116 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-18 18:00:03,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 18:00:03,117 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-18 18:00:03,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:03,118 INFO L225 Difference]: With dead ends: 80 [2020-08-18 18:00:03,118 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 18:00:03,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:00:03,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 18:00:03,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 18:00:03,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 18:00:03,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-18 18:00:03,125 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-18 18:00:03,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:03,125 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-18 18:00:03,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 18:00:03,125 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-18 18:00:03,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 18:00:03,126 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:03,126 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:03,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 18:00:03,126 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:03,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:03,126 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-18 18:00:03,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:03,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880765224] [2020-08-18 18:00:03,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:03,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:03,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:03,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:03,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:03,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:03,754 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:03,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880765224] [2020-08-18 18:00:03,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:03,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 18:00:03,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919989302] [2020-08-18 18:00:03,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 18:00:03,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:03,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 18:00:03,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:00:03,757 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-18 18:00:04,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:04,006 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-18 18:00:04,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 18:00:04,007 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-18 18:00:04,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:04,008 INFO L225 Difference]: With dead ends: 82 [2020-08-18 18:00:04,008 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 18:00:04,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-18 18:00:04,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 18:00:04,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 18:00:04,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 18:00:04,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-18 18:00:04,014 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-18 18:00:04,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:04,014 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-18 18:00:04,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 18:00:04,015 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-18 18:00:04,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 18:00:04,015 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:04,015 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:04,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 18:00:04,016 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:04,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:04,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-18 18:00:04,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:04,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567223040] [2020-08-18 18:00:04,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:04,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:04,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:04,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:04,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:04,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:04,684 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:04,685 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567223040] [2020-08-18 18:00:04,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:04,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 18:00:04,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456665579] [2020-08-18 18:00:04,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 18:00:04,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:04,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 18:00:04,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:00:04,686 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-18 18:00:04,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:04,967 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-18 18:00:04,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 18:00:04,968 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-18 18:00:04,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:04,969 INFO L225 Difference]: With dead ends: 84 [2020-08-18 18:00:04,969 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 18:00:04,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:00:04,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 18:00:04,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 18:00:04,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 18:00:04,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-18 18:00:04,978 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-18 18:00:04,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:04,979 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-18 18:00:04,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 18:00:04,979 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-18 18:00:04,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 18:00:04,980 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:04,980 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:04,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 18:00:04,981 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:04,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:04,981 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-18 18:00:04,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:04,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567031942] [2020-08-18 18:00:04,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:05,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:05,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:05,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:05,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:05,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:05,806 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:05,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [567031942] [2020-08-18 18:00:05,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:05,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 18:00:05,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374123046] [2020-08-18 18:00:05,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 18:00:05,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:05,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 18:00:05,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:00:05,808 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-18 18:00:06,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:06,060 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-18 18:00:06,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 18:00:06,060 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-18 18:00:06,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:06,061 INFO L225 Difference]: With dead ends: 86 [2020-08-18 18:00:06,062 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 18:00:06,063 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:00:06,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 18:00:06,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 18:00:06,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 18:00:06,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-18 18:00:06,069 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-18 18:00:06,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:06,069 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-18 18:00:06,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 18:00:06,069 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-18 18:00:06,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 18:00:06,070 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:06,070 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:06,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 18:00:06,071 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:06,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:06,071 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-18 18:00:06,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:06,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [501026469] [2020-08-18 18:00:06,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:06,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:06,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:06,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:06,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:06,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:06,975 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:06,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [501026469] [2020-08-18 18:00:06,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:06,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 18:00:06,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101769072] [2020-08-18 18:00:06,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 18:00:06,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:06,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 18:00:06,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-18 18:00:06,980 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-18 18:00:07,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:07,265 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-18 18:00:07,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 18:00:07,266 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-18 18:00:07,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:07,266 INFO L225 Difference]: With dead ends: 88 [2020-08-18 18:00:07,267 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 18:00:07,267 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:00:07,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 18:00:07,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 18:00:07,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 18:00:07,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-18 18:00:07,272 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-18 18:00:07,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:07,273 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-18 18:00:07,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 18:00:07,273 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-18 18:00:07,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 18:00:07,274 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:07,274 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:07,274 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 18:00:07,274 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:07,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:07,275 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-18 18:00:07,275 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:07,275 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1583991857] [2020-08-18 18:00:07,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:07,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:07,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:07,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:07,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:07,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:08,314 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:08,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1583991857] [2020-08-18 18:00:08,316 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:08,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 18:00:08,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85229426] [2020-08-18 18:00:08,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 18:00:08,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:08,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 18:00:08,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:00:08,318 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-18 18:00:08,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:08,701 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-18 18:00:08,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 18:00:08,704 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-18 18:00:08,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:08,705 INFO L225 Difference]: With dead ends: 90 [2020-08-18 18:00:08,705 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 18:00:08,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-18 18:00:08,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 18:00:08,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 18:00:08,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 18:00:08,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-18 18:00:08,714 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-18 18:00:08,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:08,715 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-18 18:00:08,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 18:00:08,715 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-18 18:00:08,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 18:00:08,716 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:08,717 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:08,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 18:00:08,718 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:08,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:08,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-18 18:00:08,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:08,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [644130789] [2020-08-18 18:00:08,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:08,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:08,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:08,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:08,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:08,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:09,652 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:09,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [644130789] [2020-08-18 18:00:09,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:09,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 18:00:09,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204105873] [2020-08-18 18:00:09,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 18:00:09,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:09,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 18:00:09,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:00:09,668 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-18 18:00:09,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:09,952 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-18 18:00:09,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 18:00:09,953 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-18 18:00:09,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:09,954 INFO L225 Difference]: With dead ends: 92 [2020-08-18 18:00:09,954 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 18:00:09,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-18 18:00:09,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 18:00:09,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 18:00:09,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 18:00:09,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-18 18:00:09,960 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-18 18:00:09,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:09,961 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-18 18:00:09,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 18:00:09,961 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-18 18:00:09,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 18:00:09,961 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:09,962 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:09,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 18:00:09,962 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:09,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:09,962 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-18 18:00:09,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:09,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2003875280] [2020-08-18 18:00:09,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:09,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:10,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:10,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:10,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:10,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:10,986 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:10,987 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2003875280] [2020-08-18 18:00:10,987 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:10,987 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 18:00:10,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881327575] [2020-08-18 18:00:10,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 18:00:10,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:10,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 18:00:10,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:00:10,993 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-18 18:00:11,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:11,325 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-18 18:00:11,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 18:00:11,326 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-18 18:00:11,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:11,327 INFO L225 Difference]: With dead ends: 94 [2020-08-18 18:00:11,327 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 18:00:11,330 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-18 18:00:11,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 18:00:11,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 18:00:11,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 18:00:11,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-18 18:00:11,335 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-18 18:00:11,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:11,336 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-18 18:00:11,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 18:00:11,336 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-18 18:00:11,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 18:00:11,337 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:11,337 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:11,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 18:00:11,340 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:11,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:11,341 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-18 18:00:11,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:11,341 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1614112952] [2020-08-18 18:00:11,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:11,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:11,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:11,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:11,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:11,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:12,402 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:12,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1614112952] [2020-08-18 18:00:12,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:12,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 18:00:12,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248319351] [2020-08-18 18:00:12,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 18:00:12,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:12,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 18:00:12,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-18 18:00:12,404 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-18 18:00:12,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:12,799 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-18 18:00:12,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 18:00:12,799 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-18 18:00:12,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:12,800 INFO L225 Difference]: With dead ends: 96 [2020-08-18 18:00:12,800 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 18:00:12,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-18 18:00:12,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 18:00:12,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 18:00:12,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 18:00:12,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-18 18:00:12,805 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-18 18:00:12,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:12,806 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-18 18:00:12,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 18:00:12,806 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-18 18:00:12,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 18:00:12,807 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:12,807 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:12,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 18:00:12,807 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:12,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:12,808 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-18 18:00:12,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:12,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [128324674] [2020-08-18 18:00:12,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:12,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:12,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:12,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:12,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:12,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:14,111 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:14,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [128324674] [2020-08-18 18:00:14,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:14,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 18:00:14,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48817174] [2020-08-18 18:00:14,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 18:00:14,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:14,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 18:00:14,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-18 18:00:14,117 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-18 18:00:14,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:14,352 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-18 18:00:14,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 18:00:14,353 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-18 18:00:14,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:14,354 INFO L225 Difference]: With dead ends: 98 [2020-08-18 18:00:14,354 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 18:00:14,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-18 18:00:14,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 18:00:14,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 18:00:14,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 18:00:14,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-18 18:00:14,359 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-18 18:00:14,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:14,360 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-18 18:00:14,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 18:00:14,360 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-18 18:00:14,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 18:00:14,361 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:14,361 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:14,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 18:00:14,361 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:14,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:14,362 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-18 18:00:14,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:14,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1296009802] [2020-08-18 18:00:14,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:14,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:14,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:14,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:14,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:14,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:15,767 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:15,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1296009802] [2020-08-18 18:00:15,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:15,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 18:00:15,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121457498] [2020-08-18 18:00:15,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 18:00:15,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:15,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 18:00:15,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-18 18:00:15,770 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-18 18:00:16,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:16,290 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-18 18:00:16,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 18:00:16,291 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-18 18:00:16,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:16,292 INFO L225 Difference]: With dead ends: 100 [2020-08-18 18:00:16,293 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 18:00:16,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:00:16,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 18:00:16,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 18:00:16,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 18:00:16,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-18 18:00:16,300 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-18 18:00:16,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:16,300 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-18 18:00:16,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 18:00:16,301 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-18 18:00:16,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 18:00:16,302 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:16,302 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:16,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 18:00:16,303 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:16,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:16,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-18 18:00:16,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:16,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1417366483] [2020-08-18 18:00:16,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:16,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:16,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:16,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:16,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:16,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:17,580 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:17,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1417366483] [2020-08-18 18:00:17,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:17,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 18:00:17,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590582747] [2020-08-18 18:00:17,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 18:00:17,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:17,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 18:00:17,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-18 18:00:17,582 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-18 18:00:17,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:17,984 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-18 18:00:17,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 18:00:17,984 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-18 18:00:17,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:17,985 INFO L225 Difference]: With dead ends: 102 [2020-08-18 18:00:17,985 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 18:00:17,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:00:17,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 18:00:17,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 18:00:17,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 18:00:17,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-18 18:00:17,990 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-18 18:00:17,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:17,991 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-18 18:00:17,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 18:00:17,991 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-18 18:00:17,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 18:00:17,992 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:17,992 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:17,992 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 18:00:17,992 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:17,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:17,993 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-18 18:00:17,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:17,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [14914608] [2020-08-18 18:00:17,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:18,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:18,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:18,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:18,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:18,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:19,328 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:19,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [14914608] [2020-08-18 18:00:19,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:19,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 18:00:19,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501795229] [2020-08-18 18:00:19,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 18:00:19,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:19,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 18:00:19,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-18 18:00:19,330 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-18 18:00:19,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:19,621 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-18 18:00:19,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 18:00:19,622 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-18 18:00:19,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:19,622 INFO L225 Difference]: With dead ends: 104 [2020-08-18 18:00:19,623 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 18:00:19,623 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 18:00:19,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 18:00:19,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 18:00:19,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 18:00:19,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-18 18:00:19,629 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-18 18:00:19,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:19,629 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-18 18:00:19,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 18:00:19,629 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-18 18:00:19,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 18:00:19,630 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:19,630 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:19,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 18:00:19,630 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:19,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:19,630 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-18 18:00:19,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:19,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343408100] [2020-08-18 18:00:19,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:19,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:19,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:19,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:19,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:19,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:21,035 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:21,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343408100] [2020-08-18 18:00:21,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:21,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 18:00:21,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447101292] [2020-08-18 18:00:21,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 18:00:21,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:21,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 18:00:21,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:00:21,037 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-18 18:00:21,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:21,480 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-18 18:00:21,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 18:00:21,480 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-18 18:00:21,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:21,481 INFO L225 Difference]: With dead ends: 106 [2020-08-18 18:00:21,481 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 18:00:21,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 18:00:21,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 18:00:21,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 18:00:21,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 18:00:21,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-18 18:00:21,486 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-18 18:00:21,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:21,487 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-18 18:00:21,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 18:00:21,487 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-18 18:00:21,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 18:00:21,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:21,488 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:21,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 18:00:21,488 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:21,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:21,488 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-18 18:00:21,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:21,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1783541516] [2020-08-18 18:00:21,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:21,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:21,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:21,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:21,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:21,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:22,937 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:22,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1783541516] [2020-08-18 18:00:22,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:22,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 18:00:22,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955680003] [2020-08-18 18:00:22,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 18:00:22,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:22,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 18:00:22,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:00:22,938 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-18 18:00:23,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:23,349 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-18 18:00:23,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 18:00:23,350 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-18 18:00:23,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:23,351 INFO L225 Difference]: With dead ends: 108 [2020-08-18 18:00:23,351 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 18:00:23,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 18:00:23,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 18:00:23,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 18:00:23,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 18:00:23,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-18 18:00:23,356 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-18 18:00:23,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:23,357 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-18 18:00:23,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 18:00:23,357 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-18 18:00:23,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 18:00:23,358 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:23,358 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:23,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 18:00:23,360 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:23,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:23,360 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-18 18:00:23,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:23,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933063657] [2020-08-18 18:00:23,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:23,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:23,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:23,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:23,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:23,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:25,063 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:25,064 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933063657] [2020-08-18 18:00:25,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:25,065 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 18:00:25,065 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255552601] [2020-08-18 18:00:25,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 18:00:25,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:25,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 18:00:25,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 18:00:25,068 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-18 18:00:25,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:25,502 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-18 18:00:25,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 18:00:25,502 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-18 18:00:25,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:25,503 INFO L225 Difference]: With dead ends: 110 [2020-08-18 18:00:25,504 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 18:00:25,506 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 18:00:25,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 18:00:25,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 18:00:25,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 18:00:25,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-18 18:00:25,510 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-18 18:00:25,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:25,510 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-18 18:00:25,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 18:00:25,511 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-18 18:00:25,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 18:00:25,511 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:25,511 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:25,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 18:00:25,512 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:25,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:25,512 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-18 18:00:25,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:25,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941664458] [2020-08-18 18:00:25,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:25,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:25,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:25,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:25,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:25,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:27,165 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:27,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941664458] [2020-08-18 18:00:27,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:27,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 18:00:27,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792583116] [2020-08-18 18:00:27,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 18:00:27,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:27,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 18:00:27,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 18:00:27,167 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-18 18:00:27,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:27,638 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-18 18:00:27,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 18:00:27,638 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-18 18:00:27,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:27,640 INFO L225 Difference]: With dead ends: 112 [2020-08-18 18:00:27,640 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 18:00:27,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 18:00:27,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 18:00:27,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 18:00:27,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 18:00:27,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-18 18:00:27,647 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-18 18:00:27,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:27,648 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-18 18:00:27,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 18:00:27,648 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-18 18:00:27,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 18:00:27,649 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:27,649 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:27,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 18:00:27,649 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:27,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:27,650 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-18 18:00:27,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:27,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [828437635] [2020-08-18 18:00:27,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:27,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:27,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:27,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:27,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:27,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:29,444 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:29,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [828437635] [2020-08-18 18:00:29,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:29,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 18:00:29,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213166431] [2020-08-18 18:00:29,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 18:00:29,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:29,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 18:00:29,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 18:00:29,446 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-18 18:00:29,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:29,908 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-18 18:00:29,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 18:00:29,908 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-18 18:00:29,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:29,909 INFO L225 Difference]: With dead ends: 114 [2020-08-18 18:00:29,909 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 18:00:29,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 18:00:29,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 18:00:29,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 18:00:29,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 18:00:29,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-18 18:00:29,926 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-18 18:00:29,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:29,926 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-18 18:00:29,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 18:00:29,927 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-18 18:00:29,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 18:00:29,928 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:29,928 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:29,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 18:00:29,928 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:29,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:29,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-18 18:00:29,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:29,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411572529] [2020-08-18 18:00:29,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:29,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:30,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:30,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:30,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:30,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:31,779 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:31,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411572529] [2020-08-18 18:00:31,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:31,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 18:00:31,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003856716] [2020-08-18 18:00:31,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 18:00:31,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:31,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 18:00:31,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 18:00:31,782 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-18 18:00:32,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:32,157 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-18 18:00:32,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 18:00:32,157 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-18 18:00:32,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:32,159 INFO L225 Difference]: With dead ends: 116 [2020-08-18 18:00:32,159 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 18:00:32,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:00:32,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 18:00:32,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 18:00:32,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 18:00:32,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-18 18:00:32,166 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-18 18:00:32,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:32,167 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-18 18:00:32,167 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 18:00:32,167 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-18 18:00:32,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 18:00:32,168 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:32,168 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:32,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 18:00:32,168 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:32,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:32,169 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-18 18:00:32,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:32,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12235302] [2020-08-18 18:00:32,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:32,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:32,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:32,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:32,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:32,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:34,066 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:34,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12235302] [2020-08-18 18:00:34,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:34,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 18:00:34,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061043020] [2020-08-18 18:00:34,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 18:00:34,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:34,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 18:00:34,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 18:00:34,069 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-18 18:00:34,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:34,581 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-18 18:00:34,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 18:00:34,581 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-18 18:00:34,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:34,583 INFO L225 Difference]: With dead ends: 118 [2020-08-18 18:00:34,583 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 18:00:34,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:00:34,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 18:00:34,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 18:00:34,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 18:00:34,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-18 18:00:34,593 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-18 18:00:34,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:34,593 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-18 18:00:34,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 18:00:34,593 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-18 18:00:34,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 18:00:34,594 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:34,595 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:34,595 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 18:00:34,595 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:34,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:34,595 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-18 18:00:34,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:34,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498819093] [2020-08-18 18:00:34,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:34,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:34,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:34,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:34,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:34,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:36,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:36,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498819093] [2020-08-18 18:00:36,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:36,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 18:00:36,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881103602] [2020-08-18 18:00:36,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 18:00:36,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:36,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 18:00:36,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 18:00:36,600 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-18 18:00:37,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:37,049 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-18 18:00:37,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 18:00:37,049 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-18 18:00:37,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:37,050 INFO L225 Difference]: With dead ends: 120 [2020-08-18 18:00:37,050 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 18:00:37,052 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 18:00:37,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 18:00:37,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 18:00:37,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 18:00:37,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-18 18:00:37,057 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-18 18:00:37,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:37,057 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-18 18:00:37,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 18:00:37,057 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-18 18:00:37,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 18:00:37,058 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:37,058 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:37,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 18:00:37,058 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:37,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:37,059 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-18 18:00:37,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:37,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [700725520] [2020-08-18 18:00:37,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:37,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:37,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:37,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:37,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:37,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:39,243 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:39,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [700725520] [2020-08-18 18:00:39,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:39,244 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 18:00:39,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035601744] [2020-08-18 18:00:39,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 18:00:39,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:39,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 18:00:39,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:00:39,245 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-18 18:00:39,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:39,594 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-18 18:00:39,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 18:00:39,595 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-18 18:00:39,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:39,596 INFO L225 Difference]: With dead ends: 122 [2020-08-18 18:00:39,596 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 18:00:39,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 18:00:39,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 18:00:39,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 18:00:39,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 18:00:39,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-18 18:00:39,602 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-18 18:00:39,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:39,603 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-18 18:00:39,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 18:00:39,603 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-18 18:00:39,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 18:00:39,604 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:39,604 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:39,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 18:00:39,604 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:39,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:39,605 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-18 18:00:39,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:39,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1254313016] [2020-08-18 18:00:39,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:39,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:39,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:39,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:39,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:39,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:41,776 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:41,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1254313016] [2020-08-18 18:00:41,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:41,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 18:00:41,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227300658] [2020-08-18 18:00:41,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 18:00:41,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:41,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 18:00:41,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:00:41,778 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-18 18:00:42,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:42,107 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-18 18:00:42,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 18:00:42,108 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-18 18:00:42,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:42,109 INFO L225 Difference]: With dead ends: 124 [2020-08-18 18:00:42,109 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 18:00:42,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 18:00:42,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 18:00:42,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 18:00:42,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 18:00:42,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-18 18:00:42,115 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-18 18:00:42,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:42,116 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-18 18:00:42,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 18:00:42,116 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-18 18:00:42,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 18:00:42,116 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:42,117 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:42,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 18:00:42,117 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:42,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:42,117 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-18 18:00:42,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:42,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667301277] [2020-08-18 18:00:42,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:42,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:42,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:42,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:42,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:42,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:44,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:44,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667301277] [2020-08-18 18:00:44,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:44,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 18:00:44,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130139916] [2020-08-18 18:00:44,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 18:00:44,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:44,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 18:00:44,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 18:00:44,443 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-18 18:00:44,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:44,802 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-18 18:00:44,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 18:00:44,803 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-18 18:00:44,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:44,804 INFO L225 Difference]: With dead ends: 126 [2020-08-18 18:00:44,805 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 18:00:44,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 18:00:44,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 18:00:44,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 18:00:44,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 18:00:44,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-18 18:00:44,811 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-18 18:00:44,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:44,812 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-18 18:00:44,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 18:00:44,812 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-18 18:00:44,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 18:00:44,813 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:44,813 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:44,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 18:00:44,813 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:44,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:44,814 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-18 18:00:44,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:44,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1799230304] [2020-08-18 18:00:44,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:44,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:44,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:44,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:44,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:44,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:47,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 18:00:47,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1799230304] [2020-08-18 18:00:47,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:47,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 18:00:47,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679996236] [2020-08-18 18:00:47,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 18:00:47,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:47,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 18:00:47,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 18:00:47,202 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-18 18:00:47,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:47,656 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-18 18:00:47,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 18:00:47,657 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-18 18:00:47,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:47,658 INFO L225 Difference]: With dead ends: 128 [2020-08-18 18:00:47,658 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 18:00:47,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 18:00:47,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 18:00:47,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 18:00:47,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 18:00:47,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-18 18:00:47,665 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-18 18:00:47,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:47,665 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-18 18:00:47,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 18:00:47,665 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-18 18:00:47,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 18:00:47,666 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:47,666 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:47,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 18:00:47,667 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:47,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:47,667 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-18 18:00:47,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:47,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212123901] [2020-08-18 18:00:47,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:47,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:47,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:47,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:47,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 18:00:47,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat