/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 --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/vogal-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-12 16:26:19,213 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-12 16:26:19,216 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-12 16:26:19,257 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-12 16:26:19,258 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-12 16:26:19,259 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-12 16:26:19,260 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-12 16:26:19,262 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-12 16:26:19,263 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-12 16:26:19,264 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-12 16:26:19,265 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-12 16:26:19,266 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-12 16:26:19,267 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-12 16:26:19,268 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-12 16:26:19,269 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-12 16:26:19,270 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-12 16:26:19,270 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-12 16:26:19,271 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-12 16:26:19,273 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-12 16:26:19,274 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-12 16:26:19,276 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-12 16:26:19,277 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-12 16:26:19,278 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-12 16:26:19,279 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-12 16:26:19,282 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-12 16:26:19,282 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-12 16:26:19,282 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-12 16:26:19,283 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-12 16:26:19,284 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-12 16:26:19,285 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-12 16:26:19,285 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-12 16:26:19,286 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-12 16:26:19,288 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-12 16:26:19,288 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-12 16:26:19,292 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-12 16:26:19,292 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-12 16:26:19,293 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-12 16:26:19,293 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-12 16:26:19,294 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-12 16:26:19,295 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-12 16:26:19,295 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-12 16:26:19,297 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 [2020-10-12 16:26:19,342 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-12 16:26:19,342 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-12 16:26:19,344 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-12 16:26:19,344 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-12 16:26:19,344 INFO L138 SettingsManager]: * Use SBE=true [2020-10-12 16:26:19,345 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-12 16:26:19,345 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-12 16:26:19,345 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-12 16:26:19,345 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-12 16:26:19,345 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-12 16:26:19,347 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-12 16:26:19,347 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-12 16:26:19,347 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-12 16:26:19,348 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-12 16:26:19,348 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-12 16:26:19,348 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-12 16:26:19,348 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-12 16:26:19,349 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-12 16:26:19,349 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-12 16:26:19,349 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-12 16:26:19,349 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-12 16:26:19,349 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-12 16:26:19,350 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-12 16:26:19,350 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-12 16:26:19,350 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-12 16:26:19,350 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-12 16:26:19,350 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-12 16:26:19,350 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-12 16:26:19,351 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-12 16:26:19,351 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.rcfgbuilder: Size of a code block -> SequenceOfStatements 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 -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; [2020-10-12 16:26:19,671 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-12 16:26:19,684 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-12 16:26:19,688 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-12 16:26:19,689 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-12 16:26:19,690 INFO L275 PluginConnector]: CDTParser initialized [2020-10-12 16:26:19,691 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/vogal-2.i [2020-10-12 16:26:19,757 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7b6d05479/6b0a3eb77ad24fa085d06df4140f67b3/FLAGdf5692459 [2020-10-12 16:26:20,198 INFO L306 CDTParser]: Found 1 translation units. [2020-10-12 16:26:20,198 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/vogal-2.i [2020-10-12 16:26:20,206 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7b6d05479/6b0a3eb77ad24fa085d06df4140f67b3/FLAGdf5692459 [2020-10-12 16:26:20,543 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7b6d05479/6b0a3eb77ad24fa085d06df4140f67b3 [2020-10-12 16:26:20,553 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-12 16:26:20,555 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-12 16:26:20,557 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-12 16:26:20,557 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-12 16:26:20,561 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-12 16:26:20,562 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 04:26:20" (1/1) ... [2020-10-12 16:26:20,566 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@352c60bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:26:20, skipping insertion in model container [2020-10-12 16:26:20,566 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 04:26:20" (1/1) ... [2020-10-12 16:26:20,574 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-12 16:26:20,600 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-12 16:26:20,879 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 16:26:20,886 INFO L203 MainTranslator]: Completed pre-run [2020-10-12 16:26:20,931 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 16:26:21,041 INFO L208 MainTranslator]: Completed translation [2020-10-12 16:26:21,041 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:26:21 WrapperNode [2020-10-12 16:26:21,042 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-12 16:26:21,044 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-12 16:26:21,044 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-12 16:26:21,044 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-12 16:26:21,058 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:26:21" (1/1) ... [2020-10-12 16:26:21,060 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:26:21" (1/1) ... [2020-10-12 16:26:21,069 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:26:21" (1/1) ... [2020-10-12 16:26:21,069 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:26:21" (1/1) ... [2020-10-12 16:26:21,080 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:26:21" (1/1) ... [2020-10-12 16:26:21,086 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:26:21" (1/1) ... [2020-10-12 16:26:21,090 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:26:21" (1/1) ... [2020-10-12 16:26:21,093 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-12 16:26:21,094 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-12 16:26:21,094 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-12 16:26:21,094 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-12 16:26:21,095 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:26:21" (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 [2020-10-12 16:26:21,159 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-12 16:26:21,160 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-12 16:26:21,160 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-12 16:26:21,160 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-12 16:26:21,160 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-12 16:26:21,160 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-12 16:26:21,161 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-10-12 16:26:21,161 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-12 16:26:21,162 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-12 16:26:21,162 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-12 16:26:21,162 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-12 16:26:21,162 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-12 16:26:21,162 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-12 16:26:21,162 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-12 16:26:21,162 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-12 16:26:21,495 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-12 16:26:21,496 INFO L295 CfgBuilder]: Removed 6 assume(true) statements. [2020-10-12 16:26:21,501 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 04:26:21 BoogieIcfgContainer [2020-10-12 16:26:21,501 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-12 16:26:21,502 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-12 16:26:21,503 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-12 16:26:21,506 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-12 16:26:21,507 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.10 04:26:20" (1/3) ... [2020-10-12 16:26:21,508 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f84422b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 04:26:21, skipping insertion in model container [2020-10-12 16:26:21,508 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:26:21" (2/3) ... [2020-10-12 16:26:21,509 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f84422b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 04:26:21, skipping insertion in model container [2020-10-12 16:26:21,509 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 04:26:21" (3/3) ... [2020-10-12 16:26:21,511 INFO L109 eAbstractionObserver]: Analyzing ICFG vogal-2.i [2020-10-12 16:26:21,524 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-12 16:26:21,533 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-12 16:26:21,550 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-12 16:26:21,609 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-12 16:26:21,610 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-12 16:26:21,610 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-12 16:26:21,610 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-12 16:26:21,610 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-12 16:26:21,610 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-12 16:26:21,610 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-12 16:26:21,611 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-12 16:26:21,633 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states. [2020-10-12 16:26:21,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-12 16:26:21,640 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:26:21,641 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:26:21,642 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:26:21,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:26:21,649 INFO L82 PathProgramCache]: Analyzing trace with hash 907546272, now seen corresponding path program 1 times [2020-10-12 16:26:21,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:26:21,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176053832] [2020-10-12 16:26:21,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:26:21,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:21,805 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:21,863 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:21,915 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:22,077 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:22,293 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:22,294 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 25 [2020-10-12 16:26:22,296 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-12 16:26:22,297 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 509 [2020-10-12 16:26:22,299 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:22,300 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-12 16:26:22,300 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-12 16:26:22,300 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-10-12 16:26:22,301 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-12 16:26:22,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:26:22,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:22,655 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:22,660 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:22,661 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:26:22,662 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:26:22,662 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-10-12 16:26:22,662 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:22,664 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:26:22,664 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:26:22,664 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:26:22,664 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-12 16:26:22,677 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:26:22,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176053832] [2020-10-12 16:26:22,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 16:26:22,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-10-12 16:26:22,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727545014] [2020-10-12 16:26:22,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-12 16:26:22,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:26:22,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-12 16:26:22,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-10-12 16:26:22,711 INFO L87 Difference]: Start difference. First operand 36 states. Second operand 7 states. [2020-10-12 16:26:23,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:26:23,001 INFO L93 Difference]: Finished difference Result 94 states and 140 transitions. [2020-10-12 16:26:23,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-12 16:26:23,003 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-10-12 16:26:23,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:26:23,014 INFO L225 Difference]: With dead ends: 94 [2020-10-12 16:26:23,014 INFO L226 Difference]: Without dead ends: 48 [2020-10-12 16:26:23,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-10-12 16:26:23,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-12 16:26:23,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-10-12 16:26:23,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-12 16:26:23,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 53 transitions. [2020-10-12 16:26:23,064 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 53 transitions. Word has length 17 [2020-10-12 16:26:23,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:26:23,064 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 53 transitions. [2020-10-12 16:26:23,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-12 16:26:23,065 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 53 transitions. [2020-10-12 16:26:23,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-12 16:26:23,066 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:26:23,066 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, 1, 1, 1] [2020-10-12 16:26:23,067 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-12 16:26:23,067 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:26:23,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:26:23,068 INFO L82 PathProgramCache]: Analyzing trace with hash -1254487, now seen corresponding path program 1 times [2020-10-12 16:26:23,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:26:23,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1763858584] [2020-10-12 16:26:23,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:26:23,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:23,092 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:23,119 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:23,162 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:23,493 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:23,567 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:25,116 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:25,117 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 33 [2020-10-12 16:26:25,117 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-12 16:26:25,118 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2032 [2020-10-12 16:26:25,118 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:25,118 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-12 16:26:25,119 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:26:25,119 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-12 16:26:25,119 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:26:25,335 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 51 [2020-10-12 16:26:25,642 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 51 [2020-10-12 16:26:25,881 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 19 [2020-10-12 16:26:25,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:26:25,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:25,940 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:25,942 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:25,942 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:26:25,943 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:26:25,943 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-12 16:26:25,943 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:25,944 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:26:25,944 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:26:25,944 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:26:25,945 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:26:25,953 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:26:25,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1763858584] [2020-10-12 16:26:25,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:26:25,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-12 16:26:25,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881503009] [2020-10-12 16:26:25,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-12 16:26:25,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:26:25,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-12 16:26:25,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-10-12 16:26:25,958 INFO L87 Difference]: Start difference. First operand 41 states and 53 transitions. Second operand 10 states. [2020-10-12 16:26:26,098 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 53 [2020-10-12 16:26:26,296 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 60 [2020-10-12 16:26:26,444 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 64 [2020-10-12 16:26:26,680 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 70 [2020-10-12 16:26:26,958 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 67 [2020-10-12 16:26:27,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:26:27,049 INFO L93 Difference]: Finished difference Result 118 states and 161 transitions. [2020-10-12 16:26:27,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-12 16:26:27,050 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2020-10-12 16:26:27,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:26:27,052 INFO L225 Difference]: With dead ends: 118 [2020-10-12 16:26:27,052 INFO L226 Difference]: Without dead ends: 85 [2020-10-12 16:26:27,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=68, Invalid=172, Unknown=0, NotChecked=0, Total=240 [2020-10-12 16:26:27,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-10-12 16:26:27,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 54. [2020-10-12 16:26:27,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-10-12 16:26:27,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 72 transitions. [2020-10-12 16:26:27,067 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 72 transitions. Word has length 25 [2020-10-12 16:26:27,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:26:27,068 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 72 transitions. [2020-10-12 16:26:27,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-12 16:26:27,068 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 72 transitions. [2020-10-12 16:26:27,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-12 16:26:27,069 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:26:27,069 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:26:27,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-12 16:26:27,070 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:26:27,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:26:27,070 INFO L82 PathProgramCache]: Analyzing trace with hash 322541692, now seen corresponding path program 1 times [2020-10-12 16:26:27,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:26:27,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1764355483] [2020-10-12 16:26:27,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:26:27,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:27,087 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:27,106 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:27,128 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:27,162 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:27,365 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:31,023 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:31,023 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 36 [2020-10-12 16:26:31,023 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-12 16:26:31,024 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3940 [2020-10-12 16:26:31,024 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:31,033 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-12 16:26:31,034 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:26:31,034 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 14 [2020-10-12 16:26:31,034 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 10 [2020-10-12 16:26:31,506 WARN L193 SmtUtils]: Spent 376.00 ms on a formula simplification. DAG size of input: 139 DAG size of output: 74 [2020-10-12 16:26:31,728 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 70 [2020-10-12 16:26:32,030 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 71 [2020-10-12 16:26:32,215 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 66 [2020-10-12 16:26:32,667 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 172 DAG size of output: 73 [2020-10-12 16:26:32,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:26:32,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:32,714 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:32,716 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:32,717 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:26:32,717 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:26:32,717 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-12 16:26:32,718 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:32,718 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:26:32,718 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:26:32,718 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:26:32,718 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:26:32,734 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:26:32,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1764355483] [2020-10-12 16:26:32,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:26:32,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-12 16:26:32,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196893711] [2020-10-12 16:26:32,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-12 16:26:32,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:26:32,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-12 16:26:32,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-10-12 16:26:32,737 INFO L87 Difference]: Start difference. First operand 54 states and 72 transitions. Second operand 10 states. [2020-10-12 16:26:32,939 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 73 [2020-10-12 16:26:33,132 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 77 [2020-10-12 16:26:33,314 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 67 [2020-10-12 16:26:33,483 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 76 [2020-10-12 16:26:33,717 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 80 [2020-10-12 16:26:33,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:26:33,861 INFO L93 Difference]: Finished difference Result 161 states and 222 transitions. [2020-10-12 16:26:33,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-12 16:26:33,861 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-10-12 16:26:33,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:26:33,863 INFO L225 Difference]: With dead ends: 161 [2020-10-12 16:26:33,863 INFO L226 Difference]: Without dead ends: 121 [2020-10-12 16:26:33,864 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2020-10-12 16:26:33,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-10-12 16:26:33,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 67. [2020-10-12 16:26:33,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-10-12 16:26:33,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 88 transitions. [2020-10-12 16:26:33,883 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 88 transitions. Word has length 28 [2020-10-12 16:26:33,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:26:33,883 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 88 transitions. [2020-10-12 16:26:33,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-12 16:26:33,884 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 88 transitions. [2020-10-12 16:26:33,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-12 16:26:33,885 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:26:33,885 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, 1, 1, 1, 1, 1, 1] [2020-10-12 16:26:33,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-12 16:26:33,886 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:26:33,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:26:33,886 INFO L82 PathProgramCache]: Analyzing trace with hash -658014079, now seen corresponding path program 1 times [2020-10-12 16:26:33,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:26:33,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841343446] [2020-10-12 16:26:33,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:26:33,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:33,900 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:33,918 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:33,934 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:33,958 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:34,610 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:37,519 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:37,519 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 38 [2020-10-12 16:26:37,520 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-12 16:26:37,520 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3622 [2020-10-12 16:26:37,520 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:37,520 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-12 16:26:37,520 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:26:37,529 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-12 16:26:37,530 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 9 [2020-10-12 16:26:37,851 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 65 [2020-10-12 16:26:38,021 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 71 [2020-10-12 16:26:38,605 WARN L193 SmtUtils]: Spent 442.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 97 [2020-10-12 16:26:38,792 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 126 DAG size of output: 70 [2020-10-12 16:26:39,015 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 76 [2020-10-12 16:26:39,467 WARN L193 SmtUtils]: Spent 334.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 116 [2020-10-12 16:26:39,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:26:39,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:39,519 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:39,520 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:39,521 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:26:39,521 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:26:39,521 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-12 16:26:39,521 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:39,521 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:26:39,522 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:26:39,522 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:26:39,522 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:26:39,542 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-12 16:26:39,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841343446] [2020-10-12 16:26:39,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:26:39,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-12 16:26:39,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152777904] [2020-10-12 16:26:39,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-12 16:26:39,545 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:26:39,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-12 16:26:39,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-10-12 16:26:39,546 INFO L87 Difference]: Start difference. First operand 67 states and 88 transitions. Second operand 12 states. [2020-10-12 16:26:40,095 WARN L193 SmtUtils]: Spent 426.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 119 [2020-10-12 16:26:40,430 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 114 [2020-10-12 16:26:40,841 WARN L193 SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 119 [2020-10-12 16:26:41,116 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 74 [2020-10-12 16:26:41,910 WARN L193 SmtUtils]: Spent 738.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 145 [2020-10-12 16:26:42,768 WARN L193 SmtUtils]: Spent 712.00 ms on a formula simplification. DAG size of input: 241 DAG size of output: 149 [2020-10-12 16:26:43,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:26:43,267 INFO L93 Difference]: Finished difference Result 183 states and 248 transitions. [2020-10-12 16:26:43,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-12 16:26:43,268 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 30 [2020-10-12 16:26:43,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:26:43,272 INFO L225 Difference]: With dead ends: 183 [2020-10-12 16:26:43,272 INFO L226 Difference]: Without dead ends: 172 [2020-10-12 16:26:43,273 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=98, Invalid=244, Unknown=0, NotChecked=0, Total=342 [2020-10-12 16:26:43,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2020-10-12 16:26:43,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 71. [2020-10-12 16:26:43,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-10-12 16:26:43,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 94 transitions. [2020-10-12 16:26:43,304 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 94 transitions. Word has length 30 [2020-10-12 16:26:43,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:26:43,304 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 94 transitions. [2020-10-12 16:26:43,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-12 16:26:43,305 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 94 transitions. [2020-10-12 16:26:43,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-12 16:26:43,312 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:26:43,313 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:26:43,313 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-12 16:26:43,313 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:26:43,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:26:43,313 INFO L82 PathProgramCache]: Analyzing trace with hash -410031266, now seen corresponding path program 2 times [2020-10-12 16:26:43,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:26:43,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556680857] [2020-10-12 16:26:43,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:26:43,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:43,344 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:43,365 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:43,383 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:43,408 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:43,844 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:47,461 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:47,461 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 38 [2020-10-12 16:26:47,461 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-12 16:26:47,461 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4125 [2020-10-12 16:26:47,462 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:47,462 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-12 16:26:47,462 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:26:47,462 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-12 16:26:47,462 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:26:47,857 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 71 [2020-10-12 16:26:48,368 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 175 DAG size of output: 71 [2020-10-12 16:26:48,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:26:48,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:48,419 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:48,420 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:48,420 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:26:48,420 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:26:48,420 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:26:48,420 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:48,421 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:26:48,421 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:26:48,421 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:26:48,421 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:26:48,441 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-12 16:26:48,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556680857] [2020-10-12 16:26:48,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 16:26:48,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-10-12 16:26:48,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132934104] [2020-10-12 16:26:48,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-12 16:26:48,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:26:48,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-12 16:26:48,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-10-12 16:26:48,444 INFO L87 Difference]: Start difference. First operand 71 states and 94 transitions. Second operand 9 states. [2020-10-12 16:26:48,831 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 88 [2020-10-12 16:26:49,041 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 96 [2020-10-12 16:26:49,338 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 100 [2020-10-12 16:26:49,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:26:49,474 INFO L93 Difference]: Finished difference Result 141 states and 189 transitions. [2020-10-12 16:26:49,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-12 16:26:49,474 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2020-10-12 16:26:49,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:26:49,476 INFO L225 Difference]: With dead ends: 141 [2020-10-12 16:26:49,477 INFO L226 Difference]: Without dead ends: 101 [2020-10-12 16:26:49,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-10-12 16:26:49,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-10-12 16:26:49,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 73. [2020-10-12 16:26:49,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-10-12 16:26:49,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 97 transitions. [2020-10-12 16:26:49,520 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 97 transitions. Word has length 30 [2020-10-12 16:26:49,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:26:49,520 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 97 transitions. [2020-10-12 16:26:49,520 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-12 16:26:49,520 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 97 transitions. [2020-10-12 16:26:49,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-12 16:26:49,526 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:26:49,526 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:26:49,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-12 16:26:49,526 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:26:49,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:26:49,528 INFO L82 PathProgramCache]: Analyzing trace with hash -1813245878, now seen corresponding path program 3 times [2020-10-12 16:26:49,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:26:49,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460238238] [2020-10-12 16:26:49,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:26:49,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:49,545 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:49,557 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:49,568 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:49,582 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:49,642 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:52,174 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:52,174 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-10-12 16:26:52,174 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-12 16:26:52,175 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2631 [2020-10-12 16:26:52,175 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:52,175 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-10-12 16:26:52,176 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 16 [2020-10-12 16:26:52,176 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-12 16:26:52,176 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:26:52,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:26:52,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:52,425 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:52,426 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:52,428 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:26:52,428 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:26:52,428 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:26:52,428 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:52,428 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:26:52,429 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:26:52,429 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:26:52,429 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:26:52,433 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-12 16:26:52,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460238238] [2020-10-12 16:26:52,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 16:26:52,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-10-12 16:26:52,436 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420135640] [2020-10-12 16:26:52,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-12 16:26:52,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:26:52,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-12 16:26:52,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-10-12 16:26:52,437 INFO L87 Difference]: Start difference. First operand 73 states and 97 transitions. Second operand 9 states. [2020-10-12 16:26:52,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:26:52,720 INFO L93 Difference]: Finished difference Result 111 states and 146 transitions. [2020-10-12 16:26:52,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-12 16:26:52,721 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 32 [2020-10-12 16:26:52,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:26:52,722 INFO L225 Difference]: With dead ends: 111 [2020-10-12 16:26:52,723 INFO L226 Difference]: Without dead ends: 83 [2020-10-12 16:26:52,723 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2020-10-12 16:26:52,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-10-12 16:26:52,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 56. [2020-10-12 16:26:52,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-10-12 16:26:52,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 73 transitions. [2020-10-12 16:26:52,747 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 73 transitions. Word has length 32 [2020-10-12 16:26:52,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:26:52,748 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 73 transitions. [2020-10-12 16:26:52,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-12 16:26:52,748 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 73 transitions. [2020-10-12 16:26:52,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-12 16:26:52,751 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:26:52,751 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:26:52,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-12 16:26:52,751 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:26:52,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:26:52,752 INFO L82 PathProgramCache]: Analyzing trace with hash 2031576964, now seen corresponding path program 1 times [2020-10-12 16:26:52,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:26:52,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [35855144] [2020-10-12 16:26:52,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:26:52,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:52,775 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:52,785 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:52,797 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:52,808 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:52,834 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:52,897 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:52,964 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:53,683 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:53,706 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:57,772 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:57,772 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-10-12 16:26:57,773 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 9 [2020-10-12 16:26:57,773 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5000 [2020-10-12 16:26:57,773 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:57,773 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-12 16:26:57,773 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:26:57,774 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-12 16:26:57,774 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:26:58,196 WARN L193 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 63 [2020-10-12 16:26:58,534 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 71 [2020-10-12 16:26:58,885 WARN L193 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 193 DAG size of output: 69 [2020-10-12 16:26:59,309 WARN L193 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 95 [2020-10-12 16:26:59,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:26:59,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:26:59,358 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:26:59,359 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:26:59,359 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:26:59,360 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:26:59,360 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-12 16:26:59,360 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:26:59,360 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:26:59,360 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:26:59,361 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:26:59,361 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:26:59,374 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-12 16:26:59,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [35855144] [2020-10-12 16:26:59,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:26:59,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-12 16:26:59,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082431307] [2020-10-12 16:26:59,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-12 16:26:59,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:26:59,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-12 16:26:59,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-10-12 16:26:59,376 INFO L87 Difference]: Start difference. First operand 56 states and 73 transitions. Second operand 11 states. [2020-10-12 16:26:59,649 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 64 [2020-10-12 16:26:59,912 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 64 [2020-10-12 16:27:00,124 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 83 [2020-10-12 16:27:00,392 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 85 [2020-10-12 16:27:01,042 WARN L193 SmtUtils]: Spent 581.00 ms on a formula simplification. DAG size of input: 150 DAG size of output: 143 [2020-10-12 16:27:01,515 WARN L193 SmtUtils]: Spent 401.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 98 [2020-10-12 16:27:01,997 WARN L193 SmtUtils]: Spent 421.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 102 [2020-10-12 16:27:02,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:27:02,180 INFO L93 Difference]: Finished difference Result 120 states and 161 transitions. [2020-10-12 16:27:02,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-12 16:27:02,180 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-10-12 16:27:02,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:27:02,182 INFO L225 Difference]: With dead ends: 120 [2020-10-12 16:27:02,182 INFO L226 Difference]: Without dead ends: 95 [2020-10-12 16:27:02,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=92, Invalid=288, Unknown=0, NotChecked=0, Total=380 [2020-10-12 16:27:02,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-10-12 16:27:02,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 76. [2020-10-12 16:27:02,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-10-12 16:27:02,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 102 transitions. [2020-10-12 16:27:02,209 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 102 transitions. Word has length 32 [2020-10-12 16:27:02,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:27:02,209 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 102 transitions. [2020-10-12 16:27:02,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-12 16:27:02,210 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 102 transitions. [2020-10-12 16:27:02,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-12 16:27:02,210 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:27:02,210 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:27:02,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-12 16:27:02,211 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:27:02,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:27:02,211 INFO L82 PathProgramCache]: Analyzing trace with hash -614932140, now seen corresponding path program 1 times [2020-10-12 16:27:02,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:27:02,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1015281592] [2020-10-12 16:27:02,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:27:02,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:02,221 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:02,230 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:02,244 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:02,585 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:02,585 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 41 [2020-10-12 16:27:02,585 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-12 16:27:02,585 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 366 [2020-10-12 16:27:02,585 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:02,586 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-12 16:27:02,586 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 21 [2020-10-12 16:27:02,586 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-12 16:27:02,586 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:02,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:27:02,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:02,636 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:02,637 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:02,638 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:27:02,638 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:27:02,638 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:27:02,638 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:02,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:27:02,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:27:02,639 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:27:02,639 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:02,641 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-12 16:27:02,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1015281592] [2020-10-12 16:27:02,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:27:02,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-12 16:27:02,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974551324] [2020-10-12 16:27:02,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-12 16:27:02,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:27:02,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-12 16:27:02,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-12 16:27:02,644 INFO L87 Difference]: Start difference. First operand 76 states and 102 transitions. Second operand 5 states. [2020-10-12 16:27:02,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:27:02,777 INFO L93 Difference]: Finished difference Result 181 states and 258 transitions. [2020-10-12 16:27:02,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-12 16:27:02,778 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 33 [2020-10-12 16:27:02,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:27:02,779 INFO L225 Difference]: With dead ends: 181 [2020-10-12 16:27:02,779 INFO L226 Difference]: Without dead ends: 134 [2020-10-12 16:27:02,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-12 16:27:02,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-10-12 16:27:02,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 114. [2020-10-12 16:27:02,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-10-12 16:27:02,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 147 transitions. [2020-10-12 16:27:02,816 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 147 transitions. Word has length 33 [2020-10-12 16:27:02,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:27:02,816 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 147 transitions. [2020-10-12 16:27:02,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-12 16:27:02,817 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 147 transitions. [2020-10-12 16:27:02,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-10-12 16:27:02,818 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:27:02,818 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:27:02,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-12 16:27:02,818 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:27:02,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:27:02,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1488930749, now seen corresponding path program 1 times [2020-10-12 16:27:02,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:27:02,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924792175] [2020-10-12 16:27:02,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:27:02,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:02,830 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:02,844 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:02,860 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:02,877 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:03,245 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:03,383 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:03,544 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:03,862 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:03,933 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:04,143 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:04,419 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:04,537 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:04,968 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:05,083 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:05,287 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:05,443 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:05,572 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:06,780 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:07,084 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:07,831 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:07,832 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 50 [2020-10-12 16:27:07,832 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 19 [2020-10-12 16:27:07,832 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5004 [2020-10-12 16:27:07,832 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:07,833 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 14 [2020-10-12 16:27:07,833 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:27:07,833 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 28 [2020-10-12 16:27:07,833 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:08,573 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 53 [2020-10-12 16:27:08,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:27:08,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:08,623 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:08,624 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:08,625 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:27:08,625 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:27:08,625 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:27:08,625 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:08,625 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:27:08,625 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:27:08,626 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:27:08,626 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:08,637 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-12 16:27:08,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924792175] [2020-10-12 16:27:08,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:27:08,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-10-12 16:27:08,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825807029] [2020-10-12 16:27:08,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-12 16:27:08,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:27:08,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-12 16:27:08,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-10-12 16:27:08,640 INFO L87 Difference]: Start difference. First operand 114 states and 147 transitions. Second operand 15 states. [2020-10-12 16:27:10,385 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 42 [2020-10-12 16:27:10,567 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 46 [2020-10-12 16:27:11,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:27:11,498 INFO L93 Difference]: Finished difference Result 294 states and 388 transitions. [2020-10-12 16:27:11,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-10-12 16:27:11,498 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-10-12 16:27:11,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:27:11,500 INFO L225 Difference]: With dead ends: 294 [2020-10-12 16:27:11,500 INFO L226 Difference]: Without dead ends: 279 [2020-10-12 16:27:11,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 585 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=578, Invalid=1678, Unknown=0, NotChecked=0, Total=2256 [2020-10-12 16:27:11,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-10-12 16:27:11,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 149. [2020-10-12 16:27:11,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-10-12 16:27:11,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 193 transitions. [2020-10-12 16:27:11,548 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 193 transitions. Word has length 42 [2020-10-12 16:27:11,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:27:11,548 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 193 transitions. [2020-10-12 16:27:11,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-12 16:27:11,549 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 193 transitions. [2020-10-12 16:27:11,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-10-12 16:27:11,550 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:27:11,550 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:27:11,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-12 16:27:11,550 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:27:11,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:27:11,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1707785467, now seen corresponding path program 1 times [2020-10-12 16:27:11,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:27:11,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1675456828] [2020-10-12 16:27:11,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:27:11,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:11,560 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:11,574 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:11,589 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:11,637 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:11,717 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:11,869 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:12,245 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:12,398 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:12,460 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:12,511 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:12,666 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:13,331 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:13,540 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:16,562 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:16,562 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 50 [2020-10-12 16:27:16,562 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 13 [2020-10-12 16:27:16,562 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5004 [2020-10-12 16:27:16,563 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:16,563 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-10-12 16:27:16,563 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:27:16,563 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 28 [2020-10-12 16:27:16,563 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:16,780 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 31 [2020-10-12 16:27:17,117 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 46 [2020-10-12 16:27:17,662 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 52 [2020-10-12 16:27:17,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:27:17,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:17,709 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:17,710 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:17,710 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:27:17,711 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:27:17,711 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:27:17,711 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:17,711 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:27:17,711 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:27:17,712 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:27:17,712 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:17,721 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-12 16:27:17,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1675456828] [2020-10-12 16:27:17,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:27:17,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-10-12 16:27:17,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880252842] [2020-10-12 16:27:17,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-12 16:27:17,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:27:17,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-12 16:27:17,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2020-10-12 16:27:17,723 INFO L87 Difference]: Start difference. First operand 149 states and 193 transitions. Second operand 14 states. [2020-10-12 16:27:18,863 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 48 [2020-10-12 16:27:19,023 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 52 [2020-10-12 16:27:19,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:27:19,148 INFO L93 Difference]: Finished difference Result 392 states and 508 transitions. [2020-10-12 16:27:19,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-10-12 16:27:19,149 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 42 [2020-10-12 16:27:19,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:27:19,153 INFO L225 Difference]: With dead ends: 392 [2020-10-12 16:27:19,153 INFO L226 Difference]: Without dead ends: 377 [2020-10-12 16:27:19,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=123, Invalid=429, Unknown=0, NotChecked=0, Total=552 [2020-10-12 16:27:19,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2020-10-12 16:27:19,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 184. [2020-10-12 16:27:19,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-10-12 16:27:19,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 237 transitions. [2020-10-12 16:27:19,196 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 237 transitions. Word has length 42 [2020-10-12 16:27:19,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:27:19,196 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 237 transitions. [2020-10-12 16:27:19,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-12 16:27:19,196 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 237 transitions. [2020-10-12 16:27:19,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-10-12 16:27:19,197 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:27:19,197 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:27:19,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-12 16:27:19,198 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:27:19,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:27:19,198 INFO L82 PathProgramCache]: Analyzing trace with hash 1314758457, now seen corresponding path program 1 times [2020-10-12 16:27:19,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:27:19,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088401480] [2020-10-12 16:27:19,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:27:19,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:19,207 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:19,216 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:19,224 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:19,264 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:19,409 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:19,946 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:22,020 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:24,206 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:24,206 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 50 [2020-10-12 16:27:24,207 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 7 [2020-10-12 16:27:24,207 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5001 [2020-10-12 16:27:24,207 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:24,207 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 13 [2020-10-12 16:27:24,207 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:27:24,207 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 25 [2020-10-12 16:27:24,207 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:24,374 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 36 [2020-10-12 16:27:24,534 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 51 [2020-10-12 16:27:24,654 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 28 [2020-10-12 16:27:25,069 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 43 [2020-10-12 16:27:25,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:27:25,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:25,116 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:25,117 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:25,117 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:27:25,118 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:27:25,118 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:27:25,118 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:25,118 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:27:25,118 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:27:25,118 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:27:25,118 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:25,127 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-12 16:27:25,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088401480] [2020-10-12 16:27:25,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:27:25,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-10-12 16:27:25,127 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903666020] [2020-10-12 16:27:25,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-12 16:27:25,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:27:25,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-12 16:27:25,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-10-12 16:27:25,128 INFO L87 Difference]: Start difference. First operand 184 states and 237 transitions. Second operand 15 states. [2020-10-12 16:27:25,398 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2020-10-12 16:27:25,604 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 82 [2020-10-12 16:27:25,900 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 78 [2020-10-12 16:27:26,174 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 88 [2020-10-12 16:27:26,425 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 84 [2020-10-12 16:27:26,719 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 76 [2020-10-12 16:27:26,868 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 53 [2020-10-12 16:27:27,071 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 84 [2020-10-12 16:27:27,350 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 59 [2020-10-12 16:27:27,589 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 66 [2020-10-12 16:27:27,784 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 57 [2020-10-12 16:27:27,999 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 70 [2020-10-12 16:27:28,208 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 64 [2020-10-12 16:27:28,478 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 68 [2020-10-12 16:27:28,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:27:28,917 INFO L93 Difference]: Finished difference Result 699 states and 932 transitions. [2020-10-12 16:27:28,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-10-12 16:27:28,918 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-10-12 16:27:28,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:27:28,921 INFO L225 Difference]: With dead ends: 699 [2020-10-12 16:27:28,921 INFO L226 Difference]: Without dead ends: 678 [2020-10-12 16:27:28,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=290, Invalid=766, Unknown=0, NotChecked=0, Total=1056 [2020-10-12 16:27:28,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 678 states. [2020-10-12 16:27:29,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 678 to 360. [2020-10-12 16:27:29,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 360 states. [2020-10-12 16:27:29,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 482 transitions. [2020-10-12 16:27:29,003 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 482 transitions. Word has length 42 [2020-10-12 16:27:29,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:27:29,003 INFO L479 AbstractCegarLoop]: Abstraction has 360 states and 482 transitions. [2020-10-12 16:27:29,003 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-12 16:27:29,003 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 482 transitions. [2020-10-12 16:27:29,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-10-12 16:27:29,004 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:27:29,005 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:27:29,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-12 16:27:29,005 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:27:29,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:27:29,006 INFO L82 PathProgramCache]: Analyzing trace with hash 727952443, now seen corresponding path program 1 times [2020-10-12 16:27:29,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:27:29,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [728647744] [2020-10-12 16:27:29,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:27:29,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:29,013 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:29,021 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:29,031 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:29,084 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:29,127 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:34,014 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:34,015 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 50 [2020-10-12 16:27:34,015 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-12 16:27:34,015 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5002 [2020-10-12 16:27:34,015 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:34,015 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-12 16:27:34,015 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-12 16:27:34,015 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-12 16:27:34,016 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:34,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:27:34,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:34,328 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:34,329 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:34,330 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:27:34,330 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:27:34,330 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:27:34,330 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:34,330 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:27:34,330 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:27:34,331 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:27:34,331 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:34,335 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-12 16:27:34,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [728647744] [2020-10-12 16:27:34,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:27:34,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-12 16:27:34,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879750438] [2020-10-12 16:27:34,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-12 16:27:34,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:27:34,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-12 16:27:34,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-10-12 16:27:34,337 INFO L87 Difference]: Start difference. First operand 360 states and 482 transitions. Second operand 11 states. [2020-10-12 16:27:35,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:27:35,005 INFO L93 Difference]: Finished difference Result 567 states and 730 transitions. [2020-10-12 16:27:35,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-12 16:27:35,006 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 42 [2020-10-12 16:27:35,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:27:35,009 INFO L225 Difference]: With dead ends: 567 [2020-10-12 16:27:35,009 INFO L226 Difference]: Without dead ends: 424 [2020-10-12 16:27:35,010 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=261, Unknown=0, NotChecked=0, Total=342 [2020-10-12 16:27:35,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-10-12 16:27:35,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 353. [2020-10-12 16:27:35,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 353 states. [2020-10-12 16:27:35,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 469 transitions. [2020-10-12 16:27:35,112 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 469 transitions. Word has length 42 [2020-10-12 16:27:35,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:27:35,112 INFO L479 AbstractCegarLoop]: Abstraction has 353 states and 469 transitions. [2020-10-12 16:27:35,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-12 16:27:35,112 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 469 transitions. [2020-10-12 16:27:35,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-10-12 16:27:35,113 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:27:35,114 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:27:35,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-10-12 16:27:35,114 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:27:35,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:27:35,114 INFO L82 PathProgramCache]: Analyzing trace with hash 1261528063, now seen corresponding path program 1 times [2020-10-12 16:27:35,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:27:35,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [972012482] [2020-10-12 16:27:35,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:27:35,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:35,124 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:35,136 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:35,150 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:35,227 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:35,283 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:40,096 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:40,097 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 50 [2020-10-12 16:27:40,097 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-12 16:27:40,097 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4975 [2020-10-12 16:27:40,097 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:40,097 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 11 [2020-10-12 16:27:40,097 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-12 16:27:40,097 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 24 [2020-10-12 16:27:40,098 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:40,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:27:40,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:40,589 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:40,590 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:40,590 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:27:40,590 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:27:40,591 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:27:40,591 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:40,591 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:27:40,591 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:27:40,591 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:27:40,592 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:40,600 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-12 16:27:40,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [972012482] [2020-10-12 16:27:40,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:27:40,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-10-12 16:27:40,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147154843] [2020-10-12 16:27:40,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-12 16:27:40,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:27:40,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-12 16:27:40,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-10-12 16:27:40,602 INFO L87 Difference]: Start difference. First operand 353 states and 469 transitions. Second operand 13 states. [2020-10-12 16:27:41,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:27:41,754 INFO L93 Difference]: Finished difference Result 562 states and 721 transitions. [2020-10-12 16:27:41,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-12 16:27:41,755 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 42 [2020-10-12 16:27:41,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:27:41,758 INFO L225 Difference]: With dead ends: 562 [2020-10-12 16:27:41,758 INFO L226 Difference]: Without dead ends: 547 [2020-10-12 16:27:41,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2020-10-12 16:27:41,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 547 states. [2020-10-12 16:27:41,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 547 to 400. [2020-10-12 16:27:41,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-10-12 16:27:41,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 531 transitions. [2020-10-12 16:27:41,871 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 531 transitions. Word has length 42 [2020-10-12 16:27:41,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:27:41,871 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 531 transitions. [2020-10-12 16:27:41,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-12 16:27:41,872 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 531 transitions. [2020-10-12 16:27:41,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-10-12 16:27:41,873 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:27:41,873 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:27:41,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-10-12 16:27:41,874 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:27:41,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:27:41,874 INFO L82 PathProgramCache]: Analyzing trace with hash -1297128860, now seen corresponding path program 1 times [2020-10-12 16:27:41,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:27:41,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [452323950] [2020-10-12 16:27:41,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:27:41,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:27:41,883 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:41,896 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:41,911 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:41,961 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:43,409 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:43,639 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:43,751 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:43,981 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:44,305 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:27:46,886 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:27:46,887 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 51 [2020-10-12 16:27:46,887 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 9 [2020-10-12 16:27:46,887 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5005 [2020-10-12 16:27:46,887 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:27:46,887 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 21 [2020-10-12 16:27:46,887 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 16 [2020-10-12 16:27:46,887 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 29 [2020-10-12 16:27:46,887 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:27:47,355 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 33 [2020-10-12 16:27:47,714 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 32 [2020-10-12 16:27:47,940 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 39 [2020-10-12 16:27:48,195 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 42 [2020-10-12 16:27:48,586 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 58 [2020-10-12 16:27:49,285 WARN L193 SmtUtils]: Spent 594.00 ms on a formula simplification. DAG size of input: 175 DAG size of output: 56 [2020-10-12 16:27:51,742 WARN L193 SmtUtils]: Spent 2.36 s on a formula simplification. DAG size of input: 158 DAG size of output: 61 [2020-10-12 16:27:52,149 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 50 [2020-10-12 16:27:52,575 WARN L193 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 54 [2020-10-12 16:28:01,872 WARN L193 SmtUtils]: Spent 5.03 s on a formula simplification. DAG size of input: 196 DAG size of output: 50 [2020-10-12 16:28:13,090 WARN L193 SmtUtils]: Spent 10.99 s on a formula simplification. DAG size of input: 190 DAG size of output: 44 [2020-10-12 16:28:13,822 WARN L193 SmtUtils]: Spent 496.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 44 [2020-10-12 16:28:20,815 WARN L193 SmtUtils]: Spent 6.76 s on a formula simplification. DAG size of input: 175 DAG size of output: 37 [2020-10-12 16:28:21,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:28:21,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:28:21,191 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:28:21,192 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:28:21,192 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:28:21,192 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:28:21,192 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:28:21,193 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:28:21,193 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:28:21,193 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:28:21,193 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:28:21,193 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:28:21,208 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 31 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-10-12 16:28:21,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [452323950] [2020-10-12 16:28:21,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:28:21,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-10-12 16:28:21,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679912962] [2020-10-12 16:28:21,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-10-12 16:28:21,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:28:21,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-10-12 16:28:21,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=421, Unknown=2, NotChecked=0, Total=506 [2020-10-12 16:28:21,210 INFO L87 Difference]: Start difference. First operand 400 states and 531 transitions. Second operand 23 states. [2020-10-12 16:28:23,740 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-10-12 16:28:39,220 WARN L193 SmtUtils]: Spent 14.85 s on a formula simplification. DAG size of input: 105 DAG size of output: 51 [2020-10-12 16:28:39,609 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 67 [2020-10-12 16:28:42,135 WARN L193 SmtUtils]: Spent 2.35 s on a formula simplification. DAG size of input: 112 DAG size of output: 71 [2020-10-12 16:28:55,189 WARN L193 SmtUtils]: Spent 12.89 s on a formula simplification. DAG size of input: 119 DAG size of output: 71 [2020-10-12 16:28:55,657 WARN L193 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 126 DAG size of output: 70 [2020-10-12 16:29:02,633 WARN L193 SmtUtils]: Spent 6.80 s on a formula simplification. DAG size of input: 126 DAG size of output: 69 [2020-10-12 16:29:03,255 WARN L193 SmtUtils]: Spent 357.00 ms on a formula simplification. DAG size of input: 119 DAG size of output: 67 [2020-10-12 16:29:08,256 WARN L193 SmtUtils]: Spent 2.35 s on a formula simplification. DAG size of input: 86 DAG size of output: 78 [2020-10-12 16:29:12,596 WARN L193 SmtUtils]: Spent 4.27 s on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2020-10-12 16:29:13,186 WARN L193 SmtUtils]: Spent 471.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 92 [2020-10-12 16:29:13,399 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 50 [2020-10-12 16:29:16,687 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-10-12 16:29:23,408 WARN L193 SmtUtils]: Spent 6.41 s on a formula simplification. DAG size of input: 75 DAG size of output: 55 [2020-10-12 16:29:26,311 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 67 [2020-10-12 16:29:26,873 WARN L193 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 66 [2020-10-12 16:29:31,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:29:31,229 INFO L93 Difference]: Finished difference Result 748 states and 982 transitions. [2020-10-12 16:29:31,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-10-12 16:29:31,230 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 43 [2020-10-12 16:29:31,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:29:31,234 INFO L225 Difference]: With dead ends: 748 [2020-10-12 16:29:31,234 INFO L226 Difference]: Without dead ends: 743 [2020-10-12 16:29:31,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 409 ImplicationChecksByTransitivity, 91.2s TimeCoverageRelationStatistics Valid=477, Invalid=1590, Unknown=3, NotChecked=0, Total=2070 [2020-10-12 16:29:31,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 743 states. [2020-10-12 16:29:31,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 743 to 438. [2020-10-12 16:29:31,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 438 states. [2020-10-12 16:29:31,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 587 transitions. [2020-10-12 16:29:31,406 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 587 transitions. Word has length 43 [2020-10-12 16:29:31,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:29:31,406 INFO L479 AbstractCegarLoop]: Abstraction has 438 states and 587 transitions. [2020-10-12 16:29:31,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-10-12 16:29:31,407 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 587 transitions. [2020-10-12 16:29:31,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-10-12 16:29:31,408 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:29:31,408 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:29:31,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-10-12 16:29:31,409 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:29:31,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:29:31,409 INFO L82 PathProgramCache]: Analyzing trace with hash 1731315010, now seen corresponding path program 2 times [2020-10-12 16:29:31,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:29:31,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [710677272] [2020-10-12 16:29:31,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:29:31,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:29:31,420 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:31,435 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:31,451 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:31,466 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:31,826 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:32,445 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:36,418 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:29:36,419 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 52 [2020-10-12 16:29:36,419 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 6 [2020-10-12 16:29:36,419 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5001 [2020-10-12 16:29:36,419 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:29:36,419 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-12 16:29:36,419 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 22 [2020-10-12 16:29:36,419 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 19 [2020-10-12 16:29:36,419 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:29:36,962 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 42 [2020-10-12 16:29:37,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:29:37,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:29:37,015 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:37,015 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:29:37,016 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:29:37,016 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:29:37,016 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:29:37,016 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:29:37,016 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:29:37,016 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:29:37,016 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:29:37,017 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:29:37,022 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-12 16:29:37,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [710677272] [2020-10-12 16:29:37,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:29:37,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-12 16:29:37,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828986314] [2020-10-12 16:29:37,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-12 16:29:37,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:29:37,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-12 16:29:37,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-10-12 16:29:37,024 INFO L87 Difference]: Start difference. First operand 438 states and 587 transitions. Second operand 12 states. [2020-10-12 16:29:38,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:29:38,105 INFO L93 Difference]: Finished difference Result 683 states and 897 transitions. [2020-10-12 16:29:38,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-12 16:29:38,106 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 44 [2020-10-12 16:29:38,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:29:38,110 INFO L225 Difference]: With dead ends: 683 [2020-10-12 16:29:38,110 INFO L226 Difference]: Without dead ends: 668 [2020-10-12 16:29:38,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2020-10-12 16:29:38,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2020-10-12 16:29:38,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 469. [2020-10-12 16:29:38,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 469 states. [2020-10-12 16:29:38,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 638 transitions. [2020-10-12 16:29:38,288 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 638 transitions. Word has length 44 [2020-10-12 16:29:38,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:29:38,288 INFO L479 AbstractCegarLoop]: Abstraction has 469 states and 638 transitions. [2020-10-12 16:29:38,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-12 16:29:38,288 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 638 transitions. [2020-10-12 16:29:38,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-10-12 16:29:38,290 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:29:38,290 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:29:38,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-10-12 16:29:38,290 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:29:38,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:29:38,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1338288000, now seen corresponding path program 2 times [2020-10-12 16:29:38,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:29:38,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107019893] [2020-10-12 16:29:38,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:29:38,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:29:38,306 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:38,319 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:38,332 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:38,346 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:38,521 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:40,730 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:40,949 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:42,303 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:43,308 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:29:43,308 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 52 [2020-10-12 16:29:43,308 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-10-12 16:29:43,308 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5004 [2020-10-12 16:29:43,308 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:29:43,308 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 15 [2020-10-12 16:29:43,308 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:29:43,308 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 35 [2020-10-12 16:29:43,309 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:29:43,828 WARN L193 SmtUtils]: Spent 441.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 36 [2020-10-12 16:29:44,181 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-10-12 16:29:44,598 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 29 [2020-10-12 16:29:44,888 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 31 [2020-10-12 16:29:45,409 WARN L193 SmtUtils]: Spent 418.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 45 [2020-10-12 16:29:45,569 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 35 [2020-10-12 16:29:45,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:29:45,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:29:45,920 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:45,921 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:29:45,921 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:29:45,921 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:29:45,921 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:29:45,921 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:29:45,922 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:29:45,922 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:29:45,922 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:29:45,922 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:29:45,934 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-12 16:29:45,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107019893] [2020-10-12 16:29:45,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:29:45,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-10-12 16:29:45,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028799695] [2020-10-12 16:29:45,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-12 16:29:45,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:29:45,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-12 16:29:45,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-10-12 16:29:45,936 INFO L87 Difference]: Start difference. First operand 469 states and 638 transitions. Second operand 17 states. [2020-10-12 16:29:48,876 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 32 [2020-10-12 16:29:49,142 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 45 [2020-10-12 16:29:49,287 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 34 [2020-10-12 16:29:49,533 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 39 [2020-10-12 16:29:49,756 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 35 [2020-10-12 16:29:49,962 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 38 [2020-10-12 16:29:50,226 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 48 [2020-10-12 16:29:50,482 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2020-10-12 16:29:50,702 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 41 [2020-10-12 16:29:51,061 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 32 [2020-10-12 16:29:53,554 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 46 [2020-10-12 16:29:53,927 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 40 [2020-10-12 16:29:54,171 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 55 [2020-10-12 16:29:54,384 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 52 [2020-10-12 16:29:54,564 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 37 [2020-10-12 16:29:54,963 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 50 [2020-10-12 16:29:55,248 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 47 [2020-10-12 16:29:55,562 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 54 [2020-10-12 16:29:55,859 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 51 [2020-10-12 16:29:56,119 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 40 [2020-10-12 16:29:56,347 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 34 [2020-10-12 16:29:56,775 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 52 [2020-10-12 16:29:57,022 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 54 [2020-10-12 16:29:57,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:29:57,357 INFO L93 Difference]: Finished difference Result 1108 states and 1500 transitions. [2020-10-12 16:29:57,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-10-12 16:29:57,358 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 44 [2020-10-12 16:29:57,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:29:57,363 INFO L225 Difference]: With dead ends: 1108 [2020-10-12 16:29:57,363 INFO L226 Difference]: Without dead ends: 1103 [2020-10-12 16:29:57,364 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=425, Invalid=1737, Unknown=0, NotChecked=0, Total=2162 [2020-10-12 16:29:57,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1103 states. [2020-10-12 16:29:57,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1103 to 846. [2020-10-12 16:29:57,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 846 states. [2020-10-12 16:29:57,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 846 states to 846 states and 1186 transitions. [2020-10-12 16:29:57,601 INFO L78 Accepts]: Start accepts. Automaton has 846 states and 1186 transitions. Word has length 44 [2020-10-12 16:29:57,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:29:57,602 INFO L479 AbstractCegarLoop]: Abstraction has 846 states and 1186 transitions. [2020-10-12 16:29:57,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-12 16:29:57,602 INFO L276 IsEmpty]: Start isEmpty. Operand 846 states and 1186 transitions. [2020-10-12 16:29:57,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-12 16:29:57,604 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:29:57,604 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:29:57,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-10-12 16:29:57,605 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:29:57,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:29:57,605 INFO L82 PathProgramCache]: Analyzing trace with hash -473798222, now seen corresponding path program 3 times [2020-10-12 16:29:57,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:29:57,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110212927] [2020-10-12 16:29:57,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:29:57,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:29:57,616 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:57,630 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:57,646 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:57,683 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:58,001 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:29:58,187 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:30:01,871 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:30:02,613 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:30:02,614 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 53 [2020-10-12 16:30:02,614 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 7 [2020-10-12 16:30:02,614 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5000 [2020-10-12 16:30:02,614 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:30:02,614 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 14 [2020-10-12 16:30:02,614 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:30:02,614 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 28 [2020-10-12 16:30:02,614 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:30:02,948 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 38 [2020-10-12 16:30:03,245 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 44 [2020-10-12 16:30:03,586 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 40 [2020-10-12 16:30:04,227 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 43 [2020-10-12 16:30:04,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:30:04,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:30:04,307 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:30:04,308 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:30:04,308 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:30:04,308 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:30:04,308 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:30:04,308 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:30:04,309 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:30:04,309 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:30:04,309 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:30:04,309 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:30:04,320 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-12 16:30:04,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110212927] [2020-10-12 16:30:04,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:30:04,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-10-12 16:30:04,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177554026] [2020-10-12 16:30:04,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-12 16:30:04,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:30:04,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-12 16:30:04,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2020-10-12 16:30:04,322 INFO L87 Difference]: Start difference. First operand 846 states and 1186 transitions. Second operand 15 states. [2020-10-12 16:30:04,792 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 67 [2020-10-12 16:30:04,980 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 58 [2020-10-12 16:30:05,354 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 72 [2020-10-12 16:30:05,565 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 59 [2020-10-12 16:30:05,788 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 58 [2020-10-12 16:30:06,252 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 79 [2020-10-12 16:30:08,547 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 73 [2020-10-12 16:30:11,020 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 64 [2020-10-12 16:30:13,550 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 55 [2020-10-12 16:30:13,733 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 62 [2020-10-12 16:30:14,119 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 51 [2020-10-12 16:30:14,398 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 55 [2020-10-12 16:30:14,776 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 66 [2020-10-12 16:30:15,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:30:15,952 INFO L93 Difference]: Finished difference Result 1523 states and 2157 transitions. [2020-10-12 16:30:15,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-10-12 16:30:15,953 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 45 [2020-10-12 16:30:15,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:30:15,959 INFO L225 Difference]: With dead ends: 1523 [2020-10-12 16:30:15,959 INFO L226 Difference]: Without dead ends: 1481 [2020-10-12 16:30:15,960 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=409, Invalid=1150, Unknown=1, NotChecked=0, Total=1560 [2020-10-12 16:30:15,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1481 states. [2020-10-12 16:30:16,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1481 to 774. [2020-10-12 16:30:16,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 774 states. [2020-10-12 16:30:16,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 774 states to 774 states and 1098 transitions. [2020-10-12 16:30:16,190 INFO L78 Accepts]: Start accepts. Automaton has 774 states and 1098 transitions. Word has length 45 [2020-10-12 16:30:16,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:30:16,190 INFO L479 AbstractCegarLoop]: Abstraction has 774 states and 1098 transitions. [2020-10-12 16:30:16,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-12 16:30:16,191 INFO L276 IsEmpty]: Start isEmpty. Operand 774 states and 1098 transitions. [2020-10-12 16:30:16,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-12 16:30:16,192 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:30:16,192 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:30:16,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-10-12 16:30:16,192 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:30:16,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:30:16,192 INFO L82 PathProgramCache]: Analyzing trace with hash -1317598926, now seen corresponding path program 4 times [2020-10-12 16:30:16,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:30:16,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694376352] [2020-10-12 16:30:16,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:30:16,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:30:16,202 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:30:16,211 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:30:16,220 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:30:16,276 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:30:16,418 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:30:16,539 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:30:16,699 FATAL L256 erpolLogProxyWrapper]: Now shrinking...