/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/bitvector/soft_float_5a.c.cil.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 20:31:22,909 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 20:31:22,912 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 20:31:22,938 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 20:31:22,938 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 20:31:22,939 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 20:31:22,941 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 20:31:22,943 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 20:31:22,944 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 20:31:22,945 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 20:31:22,946 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 20:31:22,947 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 20:31:22,948 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 20:31:22,949 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 20:31:22,950 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 20:31:22,951 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 20:31:22,952 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 20:31:22,952 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 20:31:22,954 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 20:31:22,956 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 20:31:22,957 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 20:31:22,959 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 20:31:22,960 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 20:31:22,961 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 20:31:22,963 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 20:31:22,963 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 20:31:22,963 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 20:31:22,964 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 20:31:22,965 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 20:31:22,966 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 20:31:22,966 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 20:31:22,967 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 20:31:22,967 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 20:31:22,968 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 20:31:22,969 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 20:31:22,969 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 20:31:22,970 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 20:31:22,970 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 20:31:22,970 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 20:31:22,971 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 20:31:22,972 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 20:31:22,973 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 20:31:23,004 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 20:31:23,006 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 20:31:23,007 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 20:31:23,008 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 20:31:23,008 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 20:31:23,008 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 20:31:23,009 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 20:31:23,009 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 20:31:23,009 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 20:31:23,009 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 20:31:23,010 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 20:31:23,010 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 20:31:23,011 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 20:31:23,011 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 20:31:23,012 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 20:31:23,012 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 20:31:23,012 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 20:31:23,013 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 20:31:23,013 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 20:31:23,013 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 20:31:23,013 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 20:31:23,014 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:31:23,014 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 20:31:23,014 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 20:31:23,014 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 20:31:23,014 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 20:31:23,015 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 20:31:23,015 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 20:31:23,015 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 20:31:23,015 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; [2020-08-21 20:31:23,320 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 20:31:23,331 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 20:31:23,334 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 20:31:23,335 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 20:31:23,336 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 20:31:23,336 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/soft_float_5a.c.cil.c [2020-08-21 20:31:23,393 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c184426a6/5d6e718537f542848f00b47bee961345/FLAG69868193f [2020-08-21 20:31:23,852 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 20:31:23,854 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/bitvector/soft_float_5a.c.cil.c [2020-08-21 20:31:23,863 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c184426a6/5d6e718537f542848f00b47bee961345/FLAG69868193f [2020-08-21 20:31:24,185 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c184426a6/5d6e718537f542848f00b47bee961345 [2020-08-21 20:31:24,193 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 20:31:24,195 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 20:31:24,196 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 20:31:24,196 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 20:31:24,199 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 20:31:24,200 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,203 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d5d5e76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24, skipping insertion in model container [2020-08-21 20:31:24,203 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,211 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 20:31:24,246 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 20:31:24,507 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:31:24,511 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 20:31:24,642 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:31:24,657 INFO L208 MainTranslator]: Completed translation [2020-08-21 20:31:24,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24 WrapperNode [2020-08-21 20:31:24,658 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 20:31:24,658 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 20:31:24,659 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 20:31:24,659 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 20:31:24,669 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,669 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,676 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,677 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,693 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,702 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,704 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,709 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 20:31:24,709 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 20:31:24,710 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 20:31:24,710 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 20:31:24,711 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:31:24,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 20:31:24,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 20:31:24,781 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 20:31:24,781 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2020-08-21 20:31:24,781 INFO L138 BoogieDeclarations]: Found implementation of procedure addflt [2020-08-21 20:31:24,781 INFO L138 BoogieDeclarations]: Found implementation of procedure mulflt [2020-08-21 20:31:24,782 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 20:31:24,782 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 20:31:24,782 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 20:31:24,782 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-21 20:31:24,782 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 20:31:24,782 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2020-08-21 20:31:24,783 INFO L130 BoogieDeclarations]: Found specification of procedure addflt [2020-08-21 20:31:24,783 INFO L130 BoogieDeclarations]: Found specification of procedure mulflt [2020-08-21 20:31:24,783 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 20:31:24,783 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 20:31:24,783 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 20:31:25,235 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 20:31:25,235 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 20:31:25,240 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:31:25 BoogieIcfgContainer [2020-08-21 20:31:25,240 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 20:31:25,242 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 20:31:25,242 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 20:31:25,245 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 20:31:25,246 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 08:31:24" (1/3) ... [2020-08-21 20:31:25,246 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ec0388b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:31:25, skipping insertion in model container [2020-08-21 20:31:25,247 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (2/3) ... [2020-08-21 20:31:25,247 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ec0388b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:31:25, skipping insertion in model container [2020-08-21 20:31:25,247 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:31:25" (3/3) ... [2020-08-21 20:31:25,249 INFO L109 eAbstractionObserver]: Analyzing ICFG soft_float_5a.c.cil.c [2020-08-21 20:31:25,260 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 20:31:25,269 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 20:31:25,283 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 20:31:25,307 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 20:31:25,307 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 20:31:25,307 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 20:31:25,307 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 20:31:25,308 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 20:31:25,308 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 20:31:25,308 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 20:31:25,308 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 20:31:25,328 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states. [2020-08-21 20:31:25,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 20:31:25,336 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:25,337 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 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, 1, 1] [2020-08-21 20:31:25,337 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:25,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:25,342 INFO L82 PathProgramCache]: Analyzing trace with hash -1570912407, now seen corresponding path program 1 times [2020-08-21 20:31:25,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:25,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [455207677] [2020-08-21 20:31:25,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:25,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:25,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:25,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:25,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 20:31:25,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2020-08-21 20:31:25,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2020-08-21 20:31:25,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,657 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:25,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [455207677] [2020-08-21 20:31:25,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:25,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 20:31:25,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368396594] [2020-08-21 20:31:25,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 20:31:25,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:25,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 20:31:25,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:31:25,691 INFO L87 Difference]: Start difference. First operand 68 states. Second operand 4 states. [2020-08-21 20:31:25,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:25,895 INFO L93 Difference]: Finished difference Result 136 states and 213 transitions. [2020-08-21 20:31:25,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 20:31:25,899 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 48 [2020-08-21 20:31:25,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:25,924 INFO L225 Difference]: With dead ends: 136 [2020-08-21 20:31:25,924 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 20:31:25,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:31:25,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 20:31:26,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 62. [2020-08-21 20:31:26,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-21 20:31:26,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 86 transitions. [2020-08-21 20:31:26,011 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 86 transitions. Word has length 48 [2020-08-21 20:31:26,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:26,011 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 86 transitions. [2020-08-21 20:31:26,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 20:31:26,012 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 86 transitions. [2020-08-21 20:31:26,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 20:31:26,015 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:26,016 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:26,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 20:31:26,016 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:26,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:26,017 INFO L82 PathProgramCache]: Analyzing trace with hash -771486554, now seen corresponding path program 1 times [2020-08-21 20:31:26,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:26,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [931323341] [2020-08-21 20:31:26,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:26,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:26,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:26,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:26,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2020-08-21 20:31:26,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 20:31:26,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 20:31:26,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,136 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:26,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [931323341] [2020-08-21 20:31:26,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:26,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 20:31:26,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215788090] [2020-08-21 20:31:26,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 20:31:26,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:26,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 20:31:26,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:31:26,141 INFO L87 Difference]: Start difference. First operand 62 states and 86 transitions. Second operand 4 states. [2020-08-21 20:31:26,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:26,262 INFO L93 Difference]: Finished difference Result 129 states and 182 transitions. [2020-08-21 20:31:26,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 20:31:26,263 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 51 [2020-08-21 20:31:26,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:26,265 INFO L225 Difference]: With dead ends: 129 [2020-08-21 20:31:26,266 INFO L226 Difference]: Without dead ends: 79 [2020-08-21 20:31:26,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:31:26,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-21 20:31:26,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2020-08-21 20:31:26,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-21 20:31:26,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 101 transitions. [2020-08-21 20:31:26,285 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 101 transitions. Word has length 51 [2020-08-21 20:31:26,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:26,286 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 101 transitions. [2020-08-21 20:31:26,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 20:31:26,286 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 101 transitions. [2020-08-21 20:31:26,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 20:31:26,289 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:26,289 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:26,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 20:31:26,289 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:26,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:26,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1553856699, now seen corresponding path program 1 times [2020-08-21 20:31:26,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:26,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1170922465] [2020-08-21 20:31:26,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:26,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:26,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:26,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:26,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2020-08-21 20:31:26,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 20:31:26,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-21 20:31:26,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,484 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:26,485 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1170922465] [2020-08-21 20:31:26,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:26,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 20:31:26,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778576686] [2020-08-21 20:31:26,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:31:26,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:26,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:31:26,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:31:26,490 INFO L87 Difference]: Start difference. First operand 72 states and 101 transitions. Second operand 5 states. [2020-08-21 20:31:26,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:26,613 INFO L93 Difference]: Finished difference Result 145 states and 205 transitions. [2020-08-21 20:31:26,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:31:26,613 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 53 [2020-08-21 20:31:26,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:26,616 INFO L225 Difference]: With dead ends: 145 [2020-08-21 20:31:26,616 INFO L226 Difference]: Without dead ends: 89 [2020-08-21 20:31:26,617 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:31:26,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-21 20:31:26,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 74. [2020-08-21 20:31:26,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-21 20:31:26,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 104 transitions. [2020-08-21 20:31:26,633 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 104 transitions. Word has length 53 [2020-08-21 20:31:26,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:26,633 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 104 transitions. [2020-08-21 20:31:26,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:31:26,633 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 104 transitions. [2020-08-21 20:31:26,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 20:31:26,636 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:26,636 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:26,636 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 20:31:26,637 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:26,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:26,637 INFO L82 PathProgramCache]: Analyzing trace with hash 76110071, now seen corresponding path program 1 times [2020-08-21 20:31:26,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:26,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1390807036] [2020-08-21 20:31:26,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:26,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:26,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:26,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:26,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 20:31:26,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2020-08-21 20:31:26,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2020-08-21 20:31:26,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,757 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:26,758 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1390807036] [2020-08-21 20:31:26,758 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:26,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 20:31:26,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352788366] [2020-08-21 20:31:26,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:31:26,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:26,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:31:26,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:31:26,760 INFO L87 Difference]: Start difference. First operand 74 states and 104 transitions. Second operand 5 states. [2020-08-21 20:31:26,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:26,840 INFO L93 Difference]: Finished difference Result 156 states and 218 transitions. [2020-08-21 20:31:26,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:31:26,841 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 54 [2020-08-21 20:31:26,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:26,843 INFO L225 Difference]: With dead ends: 156 [2020-08-21 20:31:26,843 INFO L226 Difference]: Without dead ends: 93 [2020-08-21 20:31:26,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:31:26,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-21 20:31:26,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 83. [2020-08-21 20:31:26,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 20:31:26,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 115 transitions. [2020-08-21 20:31:26,859 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 115 transitions. Word has length 54 [2020-08-21 20:31:26,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:26,859 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 115 transitions. [2020-08-21 20:31:26,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:31:26,860 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 115 transitions. [2020-08-21 20:31:26,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 20:31:26,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:26,863 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:26,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 20:31:26,863 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:26,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:26,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1237680982, now seen corresponding path program 1 times [2020-08-21 20:31:26,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:26,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307627369] [2020-08-21 20:31:26,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:26,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:26,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:26,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:26,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 20:31:27,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2020-08-21 20:31:27,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2020-08-21 20:31:27,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,077 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:27,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307627369] [2020-08-21 20:31:27,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:27,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 20:31:27,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946314487] [2020-08-21 20:31:27,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:31:27,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:27,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:31:27,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:31:27,086 INFO L87 Difference]: Start difference. First operand 83 states and 115 transitions. Second operand 6 states. [2020-08-21 20:31:27,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:27,233 INFO L93 Difference]: Finished difference Result 166 states and 233 transitions. [2020-08-21 20:31:27,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:31:27,234 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 56 [2020-08-21 20:31:27,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:27,237 INFO L225 Difference]: With dead ends: 166 [2020-08-21 20:31:27,238 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 20:31:27,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:31:27,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 20:31:27,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 84. [2020-08-21 20:31:27,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-21 20:31:27,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 117 transitions. [2020-08-21 20:31:27,255 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 117 transitions. Word has length 56 [2020-08-21 20:31:27,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:27,256 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 117 transitions. [2020-08-21 20:31:27,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:31:27,256 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 117 transitions. [2020-08-21 20:31:27,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 20:31:27,259 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:27,259 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 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, 1, 1, 1, 1, 1] [2020-08-21 20:31:27,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 20:31:27,260 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:27,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:27,260 INFO L82 PathProgramCache]: Analyzing trace with hash 714432262, now seen corresponding path program 2 times [2020-08-21 20:31:27,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:27,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473226110] [2020-08-21 20:31:27,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:27,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:27,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:27,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:27,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-21 20:31:27,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-21 20:31:27,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-21 20:31:27,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,371 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:27,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473226110] [2020-08-21 20:31:27,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:27,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 20:31:27,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591966186] [2020-08-21 20:31:27,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:31:27,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:27,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:31:27,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:31:27,374 INFO L87 Difference]: Start difference. First operand 84 states and 117 transitions. Second operand 6 states. [2020-08-21 20:31:27,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:27,481 INFO L93 Difference]: Finished difference Result 176 states and 245 transitions. [2020-08-21 20:31:27,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:31:27,482 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 57 [2020-08-21 20:31:27,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:27,487 INFO L225 Difference]: With dead ends: 176 [2020-08-21 20:31:27,487 INFO L226 Difference]: Without dead ends: 110 [2020-08-21 20:31:27,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:31:27,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-21 20:31:27,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 89. [2020-08-21 20:31:27,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 20:31:27,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 124 transitions. [2020-08-21 20:31:27,517 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 124 transitions. Word has length 57 [2020-08-21 20:31:27,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:27,518 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 124 transitions. [2020-08-21 20:31:27,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:31:27,518 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 124 transitions. [2020-08-21 20:31:27,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-21 20:31:27,522 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:27,522 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:27,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 20:31:27,523 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:27,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:27,523 INFO L82 PathProgramCache]: Analyzing trace with hash 484983205, now seen corresponding path program 2 times [2020-08-21 20:31:27,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:27,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990147145] [2020-08-21 20:31:27,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:27,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:27,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:27,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:27,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2020-08-21 20:31:27,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 20:31:27,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-21 20:31:27,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,705 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:27,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990147145] [2020-08-21 20:31:27,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:27,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:31:27,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404414577] [2020-08-21 20:31:27,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:31:27,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:27,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:31:27,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:31:27,708 INFO L87 Difference]: Start difference. First operand 89 states and 124 transitions. Second operand 7 states. [2020-08-21 20:31:27,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:27,832 INFO L93 Difference]: Finished difference Result 178 states and 251 transitions. [2020-08-21 20:31:27,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 20:31:27,833 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 59 [2020-08-21 20:31:27,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:27,835 INFO L225 Difference]: With dead ends: 178 [2020-08-21 20:31:27,835 INFO L226 Difference]: Without dead ends: 115 [2020-08-21 20:31:27,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:31:27,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-21 20:31:27,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 90. [2020-08-21 20:31:27,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-21 20:31:27,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 126 transitions. [2020-08-21 20:31:27,849 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 126 transitions. Word has length 59 [2020-08-21 20:31:27,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:27,849 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 126 transitions. [2020-08-21 20:31:27,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:31:27,849 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 126 transitions. [2020-08-21 20:31:27,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 20:31:27,851 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:27,851 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 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, 1, 1, 1, 1, 1] [2020-08-21 20:31:27,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 20:31:27,851 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:27,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:27,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1144362345, now seen corresponding path program 3 times [2020-08-21 20:31:27,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:27,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891897619] [2020-08-21 20:31:27,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:27,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:27,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:27,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:27,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 20:31:27,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2020-08-21 20:31:27,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-21 20:31:27,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,955 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:27,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891897619] [2020-08-21 20:31:27,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:27,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:31:27,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32596380] [2020-08-21 20:31:27,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:31:27,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:27,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:31:27,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:31:27,958 INFO L87 Difference]: Start difference. First operand 90 states and 126 transitions. Second operand 7 states. [2020-08-21 20:31:28,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:28,044 INFO L93 Difference]: Finished difference Result 193 states and 268 transitions. [2020-08-21 20:31:28,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 20:31:28,045 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 60 [2020-08-21 20:31:28,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:28,046 INFO L225 Difference]: With dead ends: 193 [2020-08-21 20:31:28,046 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 20:31:28,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:31:28,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 20:31:28,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 95. [2020-08-21 20:31:28,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 20:31:28,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 133 transitions. [2020-08-21 20:31:28,058 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 133 transitions. Word has length 60 [2020-08-21 20:31:28,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:28,058 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 133 transitions. [2020-08-21 20:31:28,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:31:28,058 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 133 transitions. [2020-08-21 20:31:28,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 20:31:28,060 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:28,060 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:28,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 20:31:28,060 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:28,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:28,061 INFO L82 PathProgramCache]: Analyzing trace with hash 889761014, now seen corresponding path program 3 times [2020-08-21 20:31:28,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:28,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [176512010] [2020-08-21 20:31:28,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:28,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:28,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:28,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:28,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 20:31:28,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2020-08-21 20:31:28,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2020-08-21 20:31:28,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,225 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:28,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [176512010] [2020-08-21 20:31:28,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:28,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:31:28,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516302483] [2020-08-21 20:31:28,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:31:28,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:28,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:31:28,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:31:28,235 INFO L87 Difference]: Start difference. First operand 95 states and 133 transitions. Second operand 8 states. [2020-08-21 20:31:28,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:28,414 INFO L93 Difference]: Finished difference Result 190 states and 269 transitions. [2020-08-21 20:31:28,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:31:28,416 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 62 [2020-08-21 20:31:28,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:28,417 INFO L225 Difference]: With dead ends: 190 [2020-08-21 20:31:28,418 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 20:31:28,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:31:28,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 20:31:28,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 96. [2020-08-21 20:31:28,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-08-21 20:31:28,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 135 transitions. [2020-08-21 20:31:28,437 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 135 transitions. Word has length 62 [2020-08-21 20:31:28,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:28,438 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 135 transitions. [2020-08-21 20:31:28,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:31:28,438 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 135 transitions. [2020-08-21 20:31:28,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-21 20:31:28,439 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:28,439 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1] [2020-08-21 20:31:28,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 20:31:28,440 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:28,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:28,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1481152154, now seen corresponding path program 4 times [2020-08-21 20:31:28,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:28,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1532416426] [2020-08-21 20:31:28,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:28,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:28,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:28,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:28,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2020-08-21 20:31:28,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-21 20:31:28,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-21 20:31:28,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,604 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 4 proven. 34 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:28,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1532416426] [2020-08-21 20:31:28,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:28,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:31:28,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784901356] [2020-08-21 20:31:28,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:31:28,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:28,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:31:28,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:31:28,612 INFO L87 Difference]: Start difference. First operand 96 states and 135 transitions. Second operand 8 states. [2020-08-21 20:31:28,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:28,733 INFO L93 Difference]: Finished difference Result 210 states and 291 transitions. [2020-08-21 20:31:28,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:31:28,734 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 63 [2020-08-21 20:31:28,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:28,736 INFO L225 Difference]: With dead ends: 210 [2020-08-21 20:31:28,736 INFO L226 Difference]: Without dead ends: 138 [2020-08-21 20:31:28,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=37, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:31:28,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-08-21 20:31:28,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 101. [2020-08-21 20:31:28,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 20:31:28,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 142 transitions. [2020-08-21 20:31:28,750 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 142 transitions. Word has length 63 [2020-08-21 20:31:28,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:28,750 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 142 transitions. [2020-08-21 20:31:28,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:31:28,750 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 142 transitions. [2020-08-21 20:31:28,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-21 20:31:28,752 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:28,752 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:28,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 20:31:28,752 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:28,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:28,753 INFO L82 PathProgramCache]: Analyzing trace with hash -642698235, now seen corresponding path program 4 times [2020-08-21 20:31:28,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:28,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255107572] [2020-08-21 20:31:28,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:28,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:28,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:28,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:28,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2020-08-21 20:31:28,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-21 20:31:28,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-08-21 20:31:28,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,945 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 4 proven. 38 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:28,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [255107572] [2020-08-21 20:31:28,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:28,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:31:28,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827790329] [2020-08-21 20:31:28,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:31:28,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:28,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:31:28,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:31:28,949 INFO L87 Difference]: Start difference. First operand 101 states and 142 transitions. Second operand 9 states. [2020-08-21 20:31:29,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:29,132 INFO L93 Difference]: Finished difference Result 202 states and 287 transitions. [2020-08-21 20:31:29,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:31:29,137 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 65 [2020-08-21 20:31:29,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:29,141 INFO L225 Difference]: With dead ends: 202 [2020-08-21 20:31:29,141 INFO L226 Difference]: Without dead ends: 133 [2020-08-21 20:31:29,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:31:29,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-21 20:31:29,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 102. [2020-08-21 20:31:29,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-08-21 20:31:29,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 144 transitions. [2020-08-21 20:31:29,158 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 144 transitions. Word has length 65 [2020-08-21 20:31:29,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:29,158 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 144 transitions. [2020-08-21 20:31:29,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:31:29,158 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 144 transitions. [2020-08-21 20:31:29,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 20:31:29,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:29,162 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1] [2020-08-21 20:31:29,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 20:31:29,163 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:29,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:29,163 INFO L82 PathProgramCache]: Analyzing trace with hash -1742748617, now seen corresponding path program 5 times [2020-08-21 20:31:29,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:29,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443508699] [2020-08-21 20:31:29,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:29,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:29,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:29,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:29,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 20:31:29,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2020-08-21 20:31:29,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2020-08-21 20:31:29,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,287 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 4 proven. 48 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:29,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443508699] [2020-08-21 20:31:29,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:29,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:31:29,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336090601] [2020-08-21 20:31:29,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:31:29,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:29,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:31:29,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=37, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:31:29,290 INFO L87 Difference]: Start difference. First operand 102 states and 144 transitions. Second operand 9 states. [2020-08-21 20:31:29,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:29,407 INFO L93 Difference]: Finished difference Result 227 states and 314 transitions. [2020-08-21 20:31:29,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:31:29,409 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 66 [2020-08-21 20:31:29,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:29,412 INFO L225 Difference]: With dead ends: 227 [2020-08-21 20:31:29,412 INFO L226 Difference]: Without dead ends: 152 [2020-08-21 20:31:29,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=44, Invalid=46, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:31:29,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-08-21 20:31:29,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 107. [2020-08-21 20:31:29,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 20:31:29,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 151 transitions. [2020-08-21 20:31:29,427 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 151 transitions. Word has length 66 [2020-08-21 20:31:29,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:29,427 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 151 transitions. [2020-08-21 20:31:29,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:31:29,427 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 151 transitions. [2020-08-21 20:31:29,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 20:31:29,429 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:29,429 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:29,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 20:31:29,429 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:29,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:29,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1366171286, now seen corresponding path program 5 times [2020-08-21 20:31:29,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:29,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1786263236] [2020-08-21 20:31:29,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:29,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:29,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:29,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:29,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-21 20:31:29,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-21 20:31:29,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2020-08-21 20:31:29,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,658 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 4 proven. 53 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:29,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1786263236] [2020-08-21 20:31:29,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:29,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:31:29,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612471631] [2020-08-21 20:31:29,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:31:29,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:29,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:31:29,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:31:29,661 INFO L87 Difference]: Start difference. First operand 107 states and 151 transitions. Second operand 10 states. [2020-08-21 20:31:29,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:29,848 INFO L93 Difference]: Finished difference Result 214 states and 305 transitions. [2020-08-21 20:31:29,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:31:29,849 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 68 [2020-08-21 20:31:29,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:29,850 INFO L225 Difference]: With dead ends: 214 [2020-08-21 20:31:29,851 INFO L226 Difference]: Without dead ends: 142 [2020-08-21 20:31:29,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:31:29,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-08-21 20:31:29,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 108. [2020-08-21 20:31:29,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-08-21 20:31:29,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 153 transitions. [2020-08-21 20:31:29,861 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 153 transitions. Word has length 68 [2020-08-21 20:31:29,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:29,862 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 153 transitions. [2020-08-21 20:31:29,862 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:31:29,862 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 153 transitions. [2020-08-21 20:31:29,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-21 20:31:29,863 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:29,863 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1] [2020-08-21 20:31:29,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 20:31:29,864 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:29,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:29,864 INFO L82 PathProgramCache]: Analyzing trace with hash 402664390, now seen corresponding path program 6 times [2020-08-21 20:31:29,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:29,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [367482939] [2020-08-21 20:31:29,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:29,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:29,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:29,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:29,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2020-08-21 20:31:29,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-08-21 20:31:29,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2020-08-21 20:31:29,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,002 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 4 proven. 65 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:30,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [367482939] [2020-08-21 20:31:30,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:30,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:31:30,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556911686] [2020-08-21 20:31:30,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:31:30,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:30,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:31:30,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=46, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:31:30,004 INFO L87 Difference]: Start difference. First operand 108 states and 153 transitions. Second operand 10 states. [2020-08-21 20:31:30,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:30,124 INFO L93 Difference]: Finished difference Result 244 states and 337 transitions. [2020-08-21 20:31:30,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:31:30,124 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 69 [2020-08-21 20:31:30,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:30,126 INFO L225 Difference]: With dead ends: 244 [2020-08-21 20:31:30,126 INFO L226 Difference]: Without dead ends: 166 [2020-08-21 20:31:30,127 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:31:30,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-08-21 20:31:30,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 113. [2020-08-21 20:31:30,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-21 20:31:30,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 160 transitions. [2020-08-21 20:31:30,137 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 160 transitions. Word has length 69 [2020-08-21 20:31:30,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:30,137 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 160 transitions. [2020-08-21 20:31:30,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:31:30,138 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 160 transitions. [2020-08-21 20:31:30,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-21 20:31:30,139 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:30,139 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:30,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 20:31:30,139 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:30,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:30,140 INFO L82 PathProgramCache]: Analyzing trace with hash 1523768933, now seen corresponding path program 6 times [2020-08-21 20:31:30,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:30,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434973809] [2020-08-21 20:31:30,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:30,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:30,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:30,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:30,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2020-08-21 20:31:30,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-21 20:31:30,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2020-08-21 20:31:30,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,327 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 4 proven. 71 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:30,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434973809] [2020-08-21 20:31:30,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:30,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 20:31:30,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763951318] [2020-08-21 20:31:30,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:31:30,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:30,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:31:30,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:31:30,329 INFO L87 Difference]: Start difference. First operand 113 states and 160 transitions. Second operand 11 states. [2020-08-21 20:31:30,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:30,563 INFO L93 Difference]: Finished difference Result 226 states and 323 transitions. [2020-08-21 20:31:30,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 20:31:30,564 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 71 [2020-08-21 20:31:30,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:30,566 INFO L225 Difference]: With dead ends: 226 [2020-08-21 20:31:30,566 INFO L226 Difference]: Without dead ends: 151 [2020-08-21 20:31:30,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:31:30,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-08-21 20:31:30,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 114. [2020-08-21 20:31:30,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-08-21 20:31:30,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 162 transitions. [2020-08-21 20:31:30,577 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 162 transitions. Word has length 71 [2020-08-21 20:31:30,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:30,577 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 162 transitions. [2020-08-21 20:31:30,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:31:30,578 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 162 transitions. [2020-08-21 20:31:30,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 20:31:30,579 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:30,579 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1] [2020-08-21 20:31:30,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 20:31:30,579 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:30,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:30,580 INFO L82 PathProgramCache]: Analyzing trace with hash 993224151, now seen corresponding path program 7 times [2020-08-21 20:31:30,580 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:30,580 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227197576] [2020-08-21 20:31:30,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:30,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:30,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:30,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:30,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-21 20:31:30,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2020-08-21 20:31:30,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2020-08-21 20:31:30,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,715 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 4 proven. 85 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:30,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227197576] [2020-08-21 20:31:30,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:30,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 20:31:30,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360210569] [2020-08-21 20:31:30,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:31:30,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:30,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:31:30,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:31:30,717 INFO L87 Difference]: Start difference. First operand 114 states and 162 transitions. Second operand 11 states. [2020-08-21 20:31:30,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:30,855 INFO L93 Difference]: Finished difference Result 261 states and 360 transitions. [2020-08-21 20:31:30,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 20:31:30,856 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 72 [2020-08-21 20:31:30,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:30,858 INFO L225 Difference]: With dead ends: 261 [2020-08-21 20:31:30,858 INFO L226 Difference]: Without dead ends: 180 [2020-08-21 20:31:30,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=65, Invalid=67, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:31:30,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2020-08-21 20:31:30,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 119. [2020-08-21 20:31:30,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-21 20:31:30,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 169 transitions. [2020-08-21 20:31:30,869 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 169 transitions. Word has length 72 [2020-08-21 20:31:30,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:30,870 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 169 transitions. [2020-08-21 20:31:30,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:31:30,870 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 169 transitions. [2020-08-21 20:31:30,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 20:31:30,871 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:30,871 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:30,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 20:31:30,872 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:30,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:30,872 INFO L82 PathProgramCache]: Analyzing trace with hash 2116016182, now seen corresponding path program 7 times [2020-08-21 20:31:30,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:30,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210825201] [2020-08-21 20:31:30,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:30,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:30,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:30,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:30,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-21 20:31:31,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2020-08-21 20:31:31,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2020-08-21 20:31:31,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,086 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 4 proven. 92 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:31,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210825201] [2020-08-21 20:31:31,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:31,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:31:31,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530791796] [2020-08-21 20:31:31,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:31:31,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:31,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:31:31,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:31:31,089 INFO L87 Difference]: Start difference. First operand 119 states and 169 transitions. Second operand 12 states. [2020-08-21 20:31:31,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:31,331 INFO L93 Difference]: Finished difference Result 238 states and 341 transitions. [2020-08-21 20:31:31,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 20:31:31,331 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 74 [2020-08-21 20:31:31,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:31,333 INFO L225 Difference]: With dead ends: 238 [2020-08-21 20:31:31,333 INFO L226 Difference]: Without dead ends: 160 [2020-08-21 20:31:31,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:31:31,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-08-21 20:31:31,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 120. [2020-08-21 20:31:31,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-08-21 20:31:31,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 171 transitions. [2020-08-21 20:31:31,345 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 171 transitions. Word has length 74 [2020-08-21 20:31:31,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:31,345 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 171 transitions. [2020-08-21 20:31:31,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:31:31,346 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 171 transitions. [2020-08-21 20:31:31,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-21 20:31:31,347 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:31,347 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1] [2020-08-21 20:31:31,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 20:31:31,347 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:31,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:31,348 INFO L82 PathProgramCache]: Analyzing trace with hash -2121947610, now seen corresponding path program 8 times [2020-08-21 20:31:31,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:31,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [72062871] [2020-08-21 20:31:31,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:31,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:31,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:31,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:31,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-21 20:31:31,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2020-08-21 20:31:31,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2020-08-21 20:31:31,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,534 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 4 proven. 108 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:31,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [72062871] [2020-08-21 20:31:31,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:31,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:31:31,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790433791] [2020-08-21 20:31:31,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:31:31,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:31,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:31:31,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=67, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:31:31,537 INFO L87 Difference]: Start difference. First operand 120 states and 171 transitions. Second operand 12 states. [2020-08-21 20:31:31,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:31,723 INFO L93 Difference]: Finished difference Result 278 states and 383 transitions. [2020-08-21 20:31:31,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 20:31:31,724 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 75 [2020-08-21 20:31:31,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:31,726 INFO L225 Difference]: With dead ends: 278 [2020-08-21 20:31:31,726 INFO L226 Difference]: Without dead ends: 194 [2020-08-21 20:31:31,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=79, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:31:31,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-08-21 20:31:31,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 125. [2020-08-21 20:31:31,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-21 20:31:31,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 178 transitions. [2020-08-21 20:31:31,740 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 178 transitions. Word has length 75 [2020-08-21 20:31:31,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:31,741 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 178 transitions. [2020-08-21 20:31:31,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:31:31,741 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 178 transitions. [2020-08-21 20:31:31,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-21 20:31:31,742 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:31,743 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:31,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 20:31:31,743 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:31,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:31,744 INFO L82 PathProgramCache]: Analyzing trace with hash 2028159173, now seen corresponding path program 8 times [2020-08-21 20:31:31,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:31,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [358180019] [2020-08-21 20:31:31,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:31,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:31,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:31,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:31,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2020-08-21 20:31:31,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2020-08-21 20:31:31,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2020-08-21 20:31:31,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,993 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 4 proven. 116 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:31,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [358180019] [2020-08-21 20:31:31,994 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:31,994 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:31:31,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974706646] [2020-08-21 20:31:31,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:31:31,995 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:31,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:31:31,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:31:31,996 INFO L87 Difference]: Start difference. First operand 125 states and 178 transitions. Second operand 13 states. [2020-08-21 20:31:32,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:32,297 INFO L93 Difference]: Finished difference Result 250 states and 359 transitions. [2020-08-21 20:31:32,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 20:31:32,298 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 77 [2020-08-21 20:31:32,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:32,299 INFO L225 Difference]: With dead ends: 250 [2020-08-21 20:31:32,299 INFO L226 Difference]: Without dead ends: 169 [2020-08-21 20:31:32,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=128, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:31:32,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2020-08-21 20:31:32,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 126. [2020-08-21 20:31:32,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-08-21 20:31:32,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 180 transitions. [2020-08-21 20:31:32,318 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 180 transitions. Word has length 77 [2020-08-21 20:31:32,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:32,318 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 180 transitions. [2020-08-21 20:31:32,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:31:32,318 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 180 transitions. [2020-08-21 20:31:32,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 20:31:32,319 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:32,320 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1] [2020-08-21 20:31:32,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 20:31:32,320 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:32,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:32,320 INFO L82 PathProgramCache]: Analyzing trace with hash -550547593, now seen corresponding path program 9 times [2020-08-21 20:31:32,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:32,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1201951460] [2020-08-21 20:31:32,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:32,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:32,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:32,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:32,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-21 20:31:32,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2020-08-21 20:31:32,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 20:31:32,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,549 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 4 proven. 134 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:32,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1201951460] [2020-08-21 20:31:32,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:32,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:31:32,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830718805] [2020-08-21 20:31:32,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:31:32,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:32,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:31:32,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=79, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:31:32,552 INFO L87 Difference]: Start difference. First operand 126 states and 180 transitions. Second operand 13 states. [2020-08-21 20:31:32,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:32,732 INFO L93 Difference]: Finished difference Result 295 states and 406 transitions. [2020-08-21 20:31:32,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 20:31:32,733 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 78 [2020-08-21 20:31:32,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:32,735 INFO L225 Difference]: With dead ends: 295 [2020-08-21 20:31:32,735 INFO L226 Difference]: Without dead ends: 208 [2020-08-21 20:31:32,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=92, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:31:32,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-08-21 20:31:32,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 131. [2020-08-21 20:31:32,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2020-08-21 20:31:32,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 187 transitions. [2020-08-21 20:31:32,751 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 187 transitions. Word has length 78 [2020-08-21 20:31:32,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:32,751 INFO L479 AbstractCegarLoop]: Abstraction has 131 states and 187 transitions. [2020-08-21 20:31:32,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:31:32,752 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 187 transitions. [2020-08-21 20:31:32,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 20:31:32,754 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:32,754 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:32,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 20:31:32,754 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:32,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:32,755 INFO L82 PathProgramCache]: Analyzing trace with hash 315087318, now seen corresponding path program 9 times [2020-08-21 20:31:32,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:32,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1491029661] [2020-08-21 20:31:32,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:32,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:32,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:32,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:32,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-08-21 20:31:33,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2020-08-21 20:31:33,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2020-08-21 20:31:33,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,039 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 4 proven. 143 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:33,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1491029661] [2020-08-21 20:31:33,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:33,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 20:31:33,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361647278] [2020-08-21 20:31:33,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 20:31:33,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:33,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 20:31:33,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:31:33,042 INFO L87 Difference]: Start difference. First operand 131 states and 187 transitions. Second operand 14 states. [2020-08-21 20:31:33,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:33,402 INFO L93 Difference]: Finished difference Result 262 states and 377 transitions. [2020-08-21 20:31:33,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 20:31:33,405 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 80 [2020-08-21 20:31:33,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:33,407 INFO L225 Difference]: With dead ends: 262 [2020-08-21 20:31:33,407 INFO L226 Difference]: Without dead ends: 178 [2020-08-21 20:31:33,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:31:33,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-08-21 20:31:33,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 132. [2020-08-21 20:31:33,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-08-21 20:31:33,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 189 transitions. [2020-08-21 20:31:33,422 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 189 transitions. Word has length 80 [2020-08-21 20:31:33,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:33,422 INFO L479 AbstractCegarLoop]: Abstraction has 132 states and 189 transitions. [2020-08-21 20:31:33,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 20:31:33,423 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 189 transitions. [2020-08-21 20:31:33,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-21 20:31:33,424 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:33,424 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1] [2020-08-21 20:31:33,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 20:31:33,424 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:33,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:33,425 INFO L82 PathProgramCache]: Analyzing trace with hash -2116167546, now seen corresponding path program 10 times [2020-08-21 20:31:33,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:33,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [130831047] [2020-08-21 20:31:33,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:33,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:33,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:33,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:33,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2020-08-21 20:31:33,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2020-08-21 20:31:33,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2020-08-21 20:31:33,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,605 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 4 proven. 163 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:33,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [130831047] [2020-08-21 20:31:33,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:33,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 20:31:33,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755910603] [2020-08-21 20:31:33,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 20:31:33,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:33,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 20:31:33,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=92, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:31:33,607 INFO L87 Difference]: Start difference. First operand 132 states and 189 transitions. Second operand 14 states. [2020-08-21 20:31:33,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:33,770 INFO L93 Difference]: Finished difference Result 312 states and 429 transitions. [2020-08-21 20:31:33,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 20:31:33,770 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 81 [2020-08-21 20:31:33,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:33,772 INFO L225 Difference]: With dead ends: 312 [2020-08-21 20:31:33,772 INFO L226 Difference]: Without dead ends: 222 [2020-08-21 20:31:33,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:31:33,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2020-08-21 20:31:33,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 137. [2020-08-21 20:31:33,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2020-08-21 20:31:33,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 196 transitions. [2020-08-21 20:31:33,786 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 196 transitions. Word has length 81 [2020-08-21 20:31:33,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:33,786 INFO L479 AbstractCegarLoop]: Abstraction has 137 states and 196 transitions. [2020-08-21 20:31:33,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 20:31:33,787 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 196 transitions. [2020-08-21 20:31:33,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-21 20:31:33,788 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:33,788 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:33,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 20:31:33,789 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:33,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:33,789 INFO L82 PathProgramCache]: Analyzing trace with hash -1007133915, now seen corresponding path program 10 times [2020-08-21 20:31:33,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:33,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1525173144] [2020-08-21 20:31:33,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:33,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:33,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:33,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:33,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2020-08-21 20:31:34,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2020-08-21 20:31:34,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2020-08-21 20:31:34,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,133 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 4 proven. 173 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:34,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1525173144] [2020-08-21 20:31:34,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:34,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 20:31:34,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238281591] [2020-08-21 20:31:34,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 20:31:34,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:34,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 20:31:34,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:31:34,141 INFO L87 Difference]: Start difference. First operand 137 states and 196 transitions. Second operand 15 states. [2020-08-21 20:31:34,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:34,543 INFO L93 Difference]: Finished difference Result 274 states and 395 transitions. [2020-08-21 20:31:34,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 20:31:34,544 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 83 [2020-08-21 20:31:34,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:34,546 INFO L225 Difference]: With dead ends: 274 [2020-08-21 20:31:34,546 INFO L226 Difference]: Without dead ends: 187 [2020-08-21 20:31:34,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:31:34,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-08-21 20:31:34,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 138. [2020-08-21 20:31:34,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2020-08-21 20:31:34,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 198 transitions. [2020-08-21 20:31:34,564 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 198 transitions. Word has length 83 [2020-08-21 20:31:34,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:34,564 INFO L479 AbstractCegarLoop]: Abstraction has 138 states and 198 transitions. [2020-08-21 20:31:34,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 20:31:34,564 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 198 transitions. [2020-08-21 20:31:34,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 20:31:34,566 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:34,566 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1] [2020-08-21 20:31:34,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 20:31:34,567 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:34,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:34,567 INFO L82 PathProgramCache]: Analyzing trace with hash -155352809, now seen corresponding path program 11 times [2020-08-21 20:31:34,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:34,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [502171911] [2020-08-21 20:31:34,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:34,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:34,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:34,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:34,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2020-08-21 20:31:34,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2020-08-21 20:31:34,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2020-08-21 20:31:34,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,808 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 4 proven. 195 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:34,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [502171911] [2020-08-21 20:31:34,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:34,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 20:31:34,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040889635] [2020-08-21 20:31:34,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 20:31:34,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:34,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 20:31:34,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:31:34,810 INFO L87 Difference]: Start difference. First operand 138 states and 198 transitions. Second operand 15 states. [2020-08-21 20:31:34,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:34,980 INFO L93 Difference]: Finished difference Result 329 states and 452 transitions. [2020-08-21 20:31:34,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 20:31:34,981 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 84 [2020-08-21 20:31:34,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:34,983 INFO L225 Difference]: With dead ends: 329 [2020-08-21 20:31:34,983 INFO L226 Difference]: Without dead ends: 236 [2020-08-21 20:31:34,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=119, Invalid=121, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:31:34,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2020-08-21 20:31:34,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 143. [2020-08-21 20:31:34,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-08-21 20:31:34,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 205 transitions. [2020-08-21 20:31:34,999 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 205 transitions. Word has length 84 [2020-08-21 20:31:34,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:34,999 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 205 transitions. [2020-08-21 20:31:34,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 20:31:34,999 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 205 transitions. [2020-08-21 20:31:35,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 20:31:35,001 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:35,001 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:35,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 20:31:35,001 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:35,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:35,002 INFO L82 PathProgramCache]: Analyzing trace with hash 2140152694, now seen corresponding path program 11 times [2020-08-21 20:31:35,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:35,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [416328446] [2020-08-21 20:31:35,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:35,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:35,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:35,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:35,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2020-08-21 20:31:35,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 20:31:35,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 72 [2020-08-21 20:31:35,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,338 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 4 proven. 206 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:35,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [416328446] [2020-08-21 20:31:35,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:35,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 20:31:35,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561999552] [2020-08-21 20:31:35,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 20:31:35,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:35,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 20:31:35,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:31:35,340 INFO L87 Difference]: Start difference. First operand 143 states and 205 transitions. Second operand 16 states. [2020-08-21 20:31:35,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:35,743 INFO L93 Difference]: Finished difference Result 286 states and 413 transitions. [2020-08-21 20:31:35,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 20:31:35,743 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 86 [2020-08-21 20:31:35,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:35,745 INFO L225 Difference]: With dead ends: 286 [2020-08-21 20:31:35,745 INFO L226 Difference]: Without dead ends: 196 [2020-08-21 20:31:35,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=69, Invalid=203, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:31:35,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2020-08-21 20:31:35,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 144. [2020-08-21 20:31:35,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-08-21 20:31:35,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 207 transitions. [2020-08-21 20:31:35,757 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 207 transitions. Word has length 86 [2020-08-21 20:31:35,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:35,757 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 207 transitions. [2020-08-21 20:31:35,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 20:31:35,757 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 207 transitions. [2020-08-21 20:31:35,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-21 20:31:35,759 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:35,759 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1] [2020-08-21 20:31:35,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 20:31:35,759 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:35,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:35,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1373715738, now seen corresponding path program 12 times [2020-08-21 20:31:35,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:35,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1239453530] [2020-08-21 20:31:35,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:35,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:35,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:35,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:35,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2020-08-21 20:31:35,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2020-08-21 20:31:35,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2020-08-21 20:31:35,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,005 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 4 proven. 230 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:36,005 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1239453530] [2020-08-21 20:31:36,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:36,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 20:31:36,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600797413] [2020-08-21 20:31:36,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 20:31:36,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:36,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 20:31:36,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=121, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:31:36,007 INFO L87 Difference]: Start difference. First operand 144 states and 207 transitions. Second operand 16 states. [2020-08-21 20:31:36,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:36,291 INFO L93 Difference]: Finished difference Result 346 states and 475 transitions. [2020-08-21 20:31:36,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 20:31:36,292 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 87 [2020-08-21 20:31:36,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:36,295 INFO L225 Difference]: With dead ends: 346 [2020-08-21 20:31:36,295 INFO L226 Difference]: Without dead ends: 250 [2020-08-21 20:31:36,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=135, Invalid=137, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:31:36,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-08-21 20:31:36,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 149. [2020-08-21 20:31:36,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-08-21 20:31:36,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 214 transitions. [2020-08-21 20:31:36,318 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 214 transitions. Word has length 87 [2020-08-21 20:31:36,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:36,319 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 214 transitions. [2020-08-21 20:31:36,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 20:31:36,319 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 214 transitions. [2020-08-21 20:31:36,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-21 20:31:36,320 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:36,321 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:36,321 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 20:31:36,321 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:36,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:36,322 INFO L82 PathProgramCache]: Analyzing trace with hash -475517563, now seen corresponding path program 12 times [2020-08-21 20:31:36,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:36,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1864831292] [2020-08-21 20:31:36,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:36,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:36,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:36,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:36,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2020-08-21 20:31:36,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2020-08-21 20:31:36,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75 [2020-08-21 20:31:36,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,415 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2020-08-21 20:31:36,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1864831292] [2020-08-21 20:31:36,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:31:36,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 20:31:36,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370974099] [2020-08-21 20:31:36,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 20:31:36,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:36,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 20:31:36,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:31:36,417 INFO L87 Difference]: Start difference. First operand 149 states and 214 transitions. Second operand 3 states. [2020-08-21 20:31:36,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:36,433 INFO L93 Difference]: Finished difference Result 160 states and 227 transitions. [2020-08-21 20:31:36,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 20:31:36,434 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 89 [2020-08-21 20:31:36,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:36,436 INFO L225 Difference]: With dead ends: 160 [2020-08-21 20:31:36,436 INFO L226 Difference]: Without dead ends: 149 [2020-08-21 20:31:36,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:31:36,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2020-08-21 20:31:36,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2020-08-21 20:31:36,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-08-21 20:31:36,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 213 transitions. [2020-08-21 20:31:36,451 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 213 transitions. Word has length 89 [2020-08-21 20:31:36,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:36,452 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 213 transitions. [2020-08-21 20:31:36,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 20:31:36,452 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 213 transitions. [2020-08-21 20:31:36,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 20:31:36,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:36,454 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:36,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 20:31:36,455 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:36,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:36,455 INFO L82 PathProgramCache]: Analyzing trace with hash -472997077, now seen corresponding path program 1 times [2020-08-21 20:31:36,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:36,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321400568] [2020-08-21 20:31:36,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:36,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:36,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:36,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:36,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2020-08-21 20:31:36,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2020-08-21 20:31:36,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2020-08-21 20:31:36,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,524 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2020-08-21 20:31:36,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321400568] [2020-08-21 20:31:36,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:31:36,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 20:31:36,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266536805] [2020-08-21 20:31:36,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 20:31:36,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:36,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 20:31:36,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:31:36,526 INFO L87 Difference]: Start difference. First operand 149 states and 213 transitions. Second operand 4 states. [2020-08-21 20:31:36,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:36,551 INFO L93 Difference]: Finished difference Result 161 states and 227 transitions. [2020-08-21 20:31:36,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 20:31:36,552 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 91 [2020-08-21 20:31:36,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:36,553 INFO L225 Difference]: With dead ends: 161 [2020-08-21 20:31:36,553 INFO L226 Difference]: Without dead ends: 149 [2020-08-21 20:31:36,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:31:36,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2020-08-21 20:31:36,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2020-08-21 20:31:36,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-08-21 20:31:36,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 212 transitions. [2020-08-21 20:31:36,565 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 212 transitions. Word has length 91 [2020-08-21 20:31:36,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:36,565 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 212 transitions. [2020-08-21 20:31:36,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 20:31:36,565 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 212 transitions. [2020-08-21 20:31:36,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 20:31:36,567 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:36,567 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:36,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 20:31:36,567 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:36,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:36,567 INFO L82 PathProgramCache]: Analyzing trace with hash -1494065431, now seen corresponding path program 1 times [2020-08-21 20:31:36,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:36,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1422123634] [2020-08-21 20:31:36,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:36,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:36,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:36,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:36,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2020-08-21 20:31:36,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2020-08-21 20:31:36,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2020-08-21 20:31:36,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,908 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 4 proven. 242 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:36,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1422123634] [2020-08-21 20:31:36,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:36,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 20:31:36,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106561355] [2020-08-21 20:31:36,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 20:31:36,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:36,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 20:31:36,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:31:36,910 INFO L87 Difference]: Start difference. First operand 149 states and 212 transitions. Second operand 17 states. [2020-08-21 20:31:37,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:37,470 INFO L93 Difference]: Finished difference Result 298 states and 427 transitions. [2020-08-21 20:31:37,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 20:31:37,471 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 91 [2020-08-21 20:31:37,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:37,474 INFO L225 Difference]: With dead ends: 298 [2020-08-21 20:31:37,475 INFO L226 Difference]: Without dead ends: 205 [2020-08-21 20:31:37,477 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:31:37,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-08-21 20:31:37,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 150. [2020-08-21 20:31:37,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-08-21 20:31:37,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 214 transitions. [2020-08-21 20:31:37,492 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 214 transitions. Word has length 91 [2020-08-21 20:31:37,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:37,493 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 214 transitions. [2020-08-21 20:31:37,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 20:31:37,493 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 214 transitions. [2020-08-21 20:31:37,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 20:31:37,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:37,495 INFO L422 BasicCegarLoop]: trace histogram [14, 13, 13, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:37,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 20:31:37,495 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:37,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:37,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1215060069, now seen corresponding path program 1 times [2020-08-21 20:31:37,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:37,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1473758193] [2020-08-21 20:31:37,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:37,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:37,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:37,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:37,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2020-08-21 20:31:37,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 68 [2020-08-21 20:31:37,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 78 [2020-08-21 20:31:37,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,839 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 4 proven. 268 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:37,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1473758193] [2020-08-21 20:31:37,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:37,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 20:31:37,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083137291] [2020-08-21 20:31:37,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 20:31:37,844 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:37,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 20:31:37,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=137, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:31:37,846 INFO L87 Difference]: Start difference. First operand 150 states and 214 transitions. Second operand 17 states. [2020-08-21 20:31:38,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:38,117 INFO L93 Difference]: Finished difference Result 363 states and 494 transitions. [2020-08-21 20:31:38,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 20:31:38,119 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 92 [2020-08-21 20:31:38,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:38,121 INFO L225 Difference]: With dead ends: 363 [2020-08-21 20:31:38,121 INFO L226 Difference]: Without dead ends: 264 [2020-08-21 20:31:38,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=152, Invalid=154, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:31:38,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2020-08-21 20:31:38,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 155. [2020-08-21 20:31:38,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2020-08-21 20:31:38,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 221 transitions. [2020-08-21 20:31:38,137 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 221 transitions. Word has length 92 [2020-08-21 20:31:38,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:38,137 INFO L479 AbstractCegarLoop]: Abstraction has 155 states and 221 transitions. [2020-08-21 20:31:38,137 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 20:31:38,137 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 221 transitions. [2020-08-21 20:31:38,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 20:31:38,139 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:38,139 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:38,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 20:31:38,139 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:38,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:38,139 INFO L82 PathProgramCache]: Analyzing trace with hash 1005143610, now seen corresponding path program 2 times [2020-08-21 20:31:38,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:38,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5026708] [2020-08-21 20:31:38,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:38,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:38,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:38,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:38,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2020-08-21 20:31:38,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2020-08-21 20:31:38,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 80 [2020-08-21 20:31:38,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,557 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 4 proven. 281 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:38,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5026708] [2020-08-21 20:31:38,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:38,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 20:31:38,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785251009] [2020-08-21 20:31:38,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 20:31:38,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:38,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 20:31:38,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:31:38,559 INFO L87 Difference]: Start difference. First operand 155 states and 221 transitions. Second operand 18 states. [2020-08-21 20:31:39,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:39,338 INFO L93 Difference]: Finished difference Result 310 states and 445 transitions. [2020-08-21 20:31:39,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 20:31:39,339 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 94 [2020-08-21 20:31:39,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:39,344 INFO L225 Difference]: With dead ends: 310 [2020-08-21 20:31:39,344 INFO L226 Difference]: Without dead ends: 214 [2020-08-21 20:31:39,345 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:31:39,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2020-08-21 20:31:39,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 156. [2020-08-21 20:31:39,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-08-21 20:31:39,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 223 transitions. [2020-08-21 20:31:39,365 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 223 transitions. Word has length 94 [2020-08-21 20:31:39,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:39,366 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 223 transitions. [2020-08-21 20:31:39,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 20:31:39,366 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 223 transitions. [2020-08-21 20:31:39,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-08-21 20:31:39,369 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:39,369 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:39,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 20:31:39,370 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:39,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:39,371 INFO L82 PathProgramCache]: Analyzing trace with hash -1048991126, now seen corresponding path program 2 times [2020-08-21 20:31:39,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:39,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091713846] [2020-08-21 20:31:39,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:39,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:39,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:39,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:39,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 20:31:39,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 71 [2020-08-21 20:31:39,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2020-08-21 20:31:39,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,697 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 4 proven. 309 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:39,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091713846] [2020-08-21 20:31:39,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:39,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 20:31:39,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727859403] [2020-08-21 20:31:39,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 20:31:39,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:39,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 20:31:39,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=154, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:31:39,700 INFO L87 Difference]: Start difference. First operand 156 states and 223 transitions. Second operand 18 states. [2020-08-21 20:31:39,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:39,922 INFO L93 Difference]: Finished difference Result 380 states and 517 transitions. [2020-08-21 20:31:39,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 20:31:39,923 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 95 [2020-08-21 20:31:39,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:39,925 INFO L225 Difference]: With dead ends: 380 [2020-08-21 20:31:39,925 INFO L226 Difference]: Without dead ends: 278 [2020-08-21 20:31:39,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=170, Invalid=172, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:31:39,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2020-08-21 20:31:39,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 161. [2020-08-21 20:31:39,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2020-08-21 20:31:39,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 230 transitions. [2020-08-21 20:31:39,942 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 230 transitions. Word has length 95 [2020-08-21 20:31:39,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:39,942 INFO L479 AbstractCegarLoop]: Abstraction has 161 states and 230 transitions. [2020-08-21 20:31:39,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 20:31:39,942 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 230 transitions. [2020-08-21 20:31:39,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-21 20:31:39,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:39,944 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:39,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 20:31:39,944 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:39,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:39,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1683607881, now seen corresponding path program 3 times [2020-08-21 20:31:39,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:39,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1865164287] [2020-08-21 20:31:39,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:39,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:39,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:39,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:39,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:40,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2020-08-21 20:31:40,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:40,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2020-08-21 20:31:40,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:40,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2020-08-21 20:31:40,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:40,426 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 4 proven. 323 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:40,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1865164287] [2020-08-21 20:31:40,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:40,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 20:31:40,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669086757] [2020-08-21 20:31:40,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 20:31:40,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:40,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 20:31:40,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:31:40,429 INFO L87 Difference]: Start difference. First operand 161 states and 230 transitions. Second operand 19 states. [2020-08-21 20:31:41,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:41,171 INFO L93 Difference]: Finished difference Result 322 states and 463 transitions. [2020-08-21 20:31:41,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 20:31:41,175 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2020-08-21 20:31:41,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:41,177 INFO L225 Difference]: With dead ends: 322 [2020-08-21 20:31:41,177 INFO L226 Difference]: Without dead ends: 223 [2020-08-21 20:31:41,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:31:41,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2020-08-21 20:31:41,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 162. [2020-08-21 20:31:41,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-08-21 20:31:41,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 232 transitions. [2020-08-21 20:31:41,192 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 232 transitions. Word has length 97 [2020-08-21 20:31:41,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:41,192 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 232 transitions. [2020-08-21 20:31:41,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 20:31:41,192 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 232 transitions. [2020-08-21 20:31:41,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 20:31:41,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:41,194 INFO L422 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:41,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 20:31:41,194 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:41,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:41,195 INFO L82 PathProgramCache]: Analyzing trace with hash -1491435205, now seen corresponding path program 3 times [2020-08-21 20:31:41,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:41,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1806372183] [2020-08-21 20:31:41,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:41,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:41,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:41,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:41,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2020-08-21 20:31:41,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2020-08-21 20:31:41,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 84 [2020-08-21 20:31:41,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,505 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 4 proven. 353 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:41,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1806372183] [2020-08-21 20:31:41,505 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:41,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 20:31:41,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054352500] [2020-08-21 20:31:41,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 20:31:41,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:41,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 20:31:41,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=172, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:31:41,507 INFO L87 Difference]: Start difference. First operand 162 states and 232 transitions. Second operand 19 states. [2020-08-21 20:31:41,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:41,771 INFO L93 Difference]: Finished difference Result 397 states and 540 transitions. [2020-08-21 20:31:41,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 20:31:41,773 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 98 [2020-08-21 20:31:41,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:41,776 INFO L225 Difference]: With dead ends: 397 [2020-08-21 20:31:41,777 INFO L226 Difference]: Without dead ends: 292 [2020-08-21 20:31:41,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=189, Invalid=191, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:31:41,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2020-08-21 20:31:41,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 167. [2020-08-21 20:31:41,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2020-08-21 20:31:41,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 239 transitions. [2020-08-21 20:31:41,792 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 239 transitions. Word has length 98 [2020-08-21 20:31:41,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:41,792 INFO L479 AbstractCegarLoop]: Abstraction has 167 states and 239 transitions. [2020-08-21 20:31:41,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 20:31:41,793 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 239 transitions. [2020-08-21 20:31:41,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 20:31:41,794 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:41,794 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:41,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 20:31:41,795 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:41,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:41,795 INFO L82 PathProgramCache]: Analyzing trace with hash 1696610266, now seen corresponding path program 4 times [2020-08-21 20:31:41,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:41,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360379634] [2020-08-21 20:31:41,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:41,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:41,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:41,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:41,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:42,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2020-08-21 20:31:42,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:42,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 76 [2020-08-21 20:31:42,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:42,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 86 [2020-08-21 20:31:42,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:42,280 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 4 proven. 368 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:42,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [360379634] [2020-08-21 20:31:42,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:42,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 20:31:42,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137730687] [2020-08-21 20:31:42,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 20:31:42,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:42,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 20:31:42,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:31:42,283 INFO L87 Difference]: Start difference. First operand 167 states and 239 transitions. Second operand 20 states. [2020-08-21 20:31:43,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:43,033 INFO L93 Difference]: Finished difference Result 334 states and 481 transitions. [2020-08-21 20:31:43,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 20:31:43,035 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 100 [2020-08-21 20:31:43,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:43,037 INFO L225 Difference]: With dead ends: 334 [2020-08-21 20:31:43,037 INFO L226 Difference]: Without dead ends: 232 [2020-08-21 20:31:43,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:31:43,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-08-21 20:31:43,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 168. [2020-08-21 20:31:43,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2020-08-21 20:31:43,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 241 transitions. [2020-08-21 20:31:43,048 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 241 transitions. Word has length 100 [2020-08-21 20:31:43,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:43,048 INFO L479 AbstractCegarLoop]: Abstraction has 168 states and 241 transitions. [2020-08-21 20:31:43,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 20:31:43,048 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 241 transitions. [2020-08-21 20:31:43,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-08-21 20:31:43,050 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:43,050 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:43,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 20:31:43,050 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:43,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:43,051 INFO L82 PathProgramCache]: Analyzing trace with hash -1088361270, now seen corresponding path program 4 times [2020-08-21 20:31:43,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:43,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2015049273] [2020-08-21 20:31:43,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:43,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:43,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:43,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:43,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2020-08-21 20:31:43,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2020-08-21 20:31:43,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87 [2020-08-21 20:31:43,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,420 INFO L134 CoverageAnalysis]: Checked inductivity of 422 backedges. 4 proven. 400 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:43,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2015049273] [2020-08-21 20:31:43,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:43,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 20:31:43,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431963244] [2020-08-21 20:31:43,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 20:31:43,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:43,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 20:31:43,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=191, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:31:43,422 INFO L87 Difference]: Start difference. First operand 168 states and 241 transitions. Second operand 20 states. [2020-08-21 20:31:43,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:43,697 INFO L93 Difference]: Finished difference Result 414 states and 563 transitions. [2020-08-21 20:31:43,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 20:31:43,698 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 101 [2020-08-21 20:31:43,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:43,700 INFO L225 Difference]: With dead ends: 414 [2020-08-21 20:31:43,700 INFO L226 Difference]: Without dead ends: 306 [2020-08-21 20:31:43,704 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=209, Invalid=211, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:31:43,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-08-21 20:31:43,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 173. [2020-08-21 20:31:43,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-08-21 20:31:43,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 248 transitions. [2020-08-21 20:31:43,728 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 248 transitions. Word has length 101 [2020-08-21 20:31:43,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:43,728 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 248 transitions. [2020-08-21 20:31:43,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 20:31:43,728 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 248 transitions. [2020-08-21 20:31:43,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-08-21 20:31:43,730 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:43,730 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:43,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 20:31:43,730 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:43,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:43,731 INFO L82 PathProgramCache]: Analyzing trace with hash -1791362135, now seen corresponding path program 5 times [2020-08-21 20:31:43,731 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:43,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1750426743] [2020-08-21 20:31:43,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:43,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:43,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:43,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:43,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:44,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 72 [2020-08-21 20:31:44,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:44,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79 [2020-08-21 20:31:44,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:44,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89 [2020-08-21 20:31:44,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:44,287 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 4 proven. 416 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:44,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1750426743] [2020-08-21 20:31:44,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:44,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 20:31:44,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977025979] [2020-08-21 20:31:44,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 20:31:44,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:44,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 20:31:44,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:31:44,291 INFO L87 Difference]: Start difference. First operand 173 states and 248 transitions. Second operand 21 states. [2020-08-21 20:31:45,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:45,081 INFO L93 Difference]: Finished difference Result 346 states and 499 transitions. [2020-08-21 20:31:45,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 20:31:45,087 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 103 [2020-08-21 20:31:45,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:45,089 INFO L225 Difference]: With dead ends: 346 [2020-08-21 20:31:45,089 INFO L226 Difference]: Without dead ends: 241 [2020-08-21 20:31:45,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:31:45,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-08-21 20:31:45,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 174. [2020-08-21 20:31:45,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-08-21 20:31:45,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 250 transitions. [2020-08-21 20:31:45,105 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 250 transitions. Word has length 103 [2020-08-21 20:31:45,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:45,105 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 250 transitions. [2020-08-21 20:31:45,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 20:31:45,106 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 250 transitions. [2020-08-21 20:31:45,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-21 20:31:45,107 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:45,107 INFO L422 BasicCegarLoop]: trace histogram [18, 17, 17, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:45,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 20:31:45,108 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:45,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:45,108 INFO L82 PathProgramCache]: Analyzing trace with hash -1841323301, now seen corresponding path program 5 times [2020-08-21 20:31:45,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:45,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203045754] [2020-08-21 20:31:45,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:45,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:45,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:45,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:45,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2020-08-21 20:31:45,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 80 [2020-08-21 20:31:45,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2020-08-21 20:31:45,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,462 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 4 proven. 450 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:45,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203045754] [2020-08-21 20:31:45,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:45,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 20:31:45,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330818674] [2020-08-21 20:31:45,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 20:31:45,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:45,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 20:31:45,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=211, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:31:45,465 INFO L87 Difference]: Start difference. First operand 174 states and 250 transitions. Second operand 21 states. [2020-08-21 20:31:45,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:45,769 INFO L93 Difference]: Finished difference Result 431 states and 586 transitions. [2020-08-21 20:31:45,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 20:31:45,770 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 104 [2020-08-21 20:31:45,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:45,772 INFO L225 Difference]: With dead ends: 431 [2020-08-21 20:31:45,772 INFO L226 Difference]: Without dead ends: 320 [2020-08-21 20:31:45,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=230, Invalid=232, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:31:45,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2020-08-21 20:31:45,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 179. [2020-08-21 20:31:45,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-08-21 20:31:45,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 257 transitions. [2020-08-21 20:31:45,788 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 257 transitions. Word has length 104 [2020-08-21 20:31:45,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:45,788 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 257 transitions. [2020-08-21 20:31:45,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 20:31:45,789 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 257 transitions. [2020-08-21 20:31:45,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-21 20:31:45,790 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:45,790 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:45,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 20:31:45,791 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:45,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:45,791 INFO L82 PathProgramCache]: Analyzing trace with hash 461599098, now seen corresponding path program 6 times [2020-08-21 20:31:45,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:45,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1322761022] [2020-08-21 20:31:45,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:45,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:45,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:45,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:45,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:46,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75 [2020-08-21 20:31:46,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:46,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2020-08-21 20:31:46,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:46,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 92 [2020-08-21 20:31:46,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:46,324 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 4 proven. 467 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:46,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1322761022] [2020-08-21 20:31:46,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:46,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 20:31:46,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417398970] [2020-08-21 20:31:46,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 20:31:46,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:46,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 20:31:46,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:31:46,327 INFO L87 Difference]: Start difference. First operand 179 states and 257 transitions. Second operand 22 states. [2020-08-21 20:31:47,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:47,114 INFO L93 Difference]: Finished difference Result 358 states and 517 transitions. [2020-08-21 20:31:47,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 20:31:47,115 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 106 [2020-08-21 20:31:47,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:47,117 INFO L225 Difference]: With dead ends: 358 [2020-08-21 20:31:47,117 INFO L226 Difference]: Without dead ends: 250 [2020-08-21 20:31:47,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:31:47,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-08-21 20:31:47,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 180. [2020-08-21 20:31:47,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2020-08-21 20:31:47,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 259 transitions. [2020-08-21 20:31:47,135 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 259 transitions. Word has length 106 [2020-08-21 20:31:47,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:47,136 INFO L479 AbstractCegarLoop]: Abstraction has 180 states and 259 transitions. [2020-08-21 20:31:47,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 20:31:47,136 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 259 transitions. [2020-08-21 20:31:47,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-08-21 20:31:47,137 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:47,138 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:47,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 20:31:47,138 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:47,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:47,138 INFO L82 PathProgramCache]: Analyzing trace with hash -719001814, now seen corresponding path program 6 times [2020-08-21 20:31:47,138 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:47,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1804500230] [2020-08-21 20:31:47,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:47,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:47,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:47,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:47,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 76 [2020-08-21 20:31:47,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2020-08-21 20:31:47,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:31:47,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,560 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 4 proven. 503 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:47,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1804500230] [2020-08-21 20:31:47,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:47,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 20:31:47,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221071734] [2020-08-21 20:31:47,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 20:31:47,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:47,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 20:31:47,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=232, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:31:47,562 INFO L87 Difference]: Start difference. First operand 180 states and 259 transitions. Second operand 22 states. [2020-08-21 20:31:47,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:47,798 INFO L93 Difference]: Finished difference Result 448 states and 609 transitions. [2020-08-21 20:31:47,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 20:31:47,800 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 107 [2020-08-21 20:31:47,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:47,803 INFO L225 Difference]: With dead ends: 448 [2020-08-21 20:31:47,803 INFO L226 Difference]: Without dead ends: 334 [2020-08-21 20:31:47,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=252, Invalid=254, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:31:47,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2020-08-21 20:31:47,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 185. [2020-08-21 20:31:47,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2020-08-21 20:31:47,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 266 transitions. [2020-08-21 20:31:47,825 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 266 transitions. Word has length 107 [2020-08-21 20:31:47,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:47,825 INFO L479 AbstractCegarLoop]: Abstraction has 185 states and 266 transitions. [2020-08-21 20:31:47,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 20:31:47,826 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 266 transitions. [2020-08-21 20:31:47,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-08-21 20:31:47,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:47,827 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:47,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 20:31:47,827 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:47,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:47,828 INFO L82 PathProgramCache]: Analyzing trace with hash 975756809, now seen corresponding path program 7 times [2020-08-21 20:31:47,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:47,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1357993540] [2020-08-21 20:31:47,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:47,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:47,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:47,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:47,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:48,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 78 [2020-08-21 20:31:48,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:48,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85 [2020-08-21 20:31:48,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:48,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95 [2020-08-21 20:31:48,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:48,418 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 4 proven. 521 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:48,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1357993540] [2020-08-21 20:31:48,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:48,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 20:31:48,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572379912] [2020-08-21 20:31:48,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 20:31:48,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:48,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 20:31:48,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:31:48,420 INFO L87 Difference]: Start difference. First operand 185 states and 266 transitions. Second operand 23 states. [2020-08-21 20:31:49,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:49,345 INFO L93 Difference]: Finished difference Result 370 states and 535 transitions. [2020-08-21 20:31:49,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 20:31:49,346 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 109 [2020-08-21 20:31:49,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:49,348 INFO L225 Difference]: With dead ends: 370 [2020-08-21 20:31:49,348 INFO L226 Difference]: Without dead ends: 259 [2020-08-21 20:31:49,349 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=448, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:31:49,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2020-08-21 20:31:49,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 186. [2020-08-21 20:31:49,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2020-08-21 20:31:49,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 268 transitions. [2020-08-21 20:31:49,365 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 268 transitions. Word has length 109 [2020-08-21 20:31:49,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:49,365 INFO L479 AbstractCegarLoop]: Abstraction has 186 states and 268 transitions. [2020-08-21 20:31:49,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 20:31:49,365 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 268 transitions. [2020-08-21 20:31:49,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-21 20:31:49,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:49,367 INFO L422 BasicCegarLoop]: trace histogram [20, 19, 19, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:49,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 20:31:49,367 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:49,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:49,367 INFO L82 PathProgramCache]: Analyzing trace with hash -1959981957, now seen corresponding path program 7 times [2020-08-21 20:31:49,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:49,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [911778914] [2020-08-21 20:31:49,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:49,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:49,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:49,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:49,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79 [2020-08-21 20:31:49,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 86 [2020-08-21 20:31:49,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 96 [2020-08-21 20:31:49,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,825 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 4 proven. 559 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:49,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [911778914] [2020-08-21 20:31:49,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:49,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 20:31:49,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009535698] [2020-08-21 20:31:49,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 20:31:49,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:49,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 20:31:49,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=254, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:31:49,828 INFO L87 Difference]: Start difference. First operand 186 states and 268 transitions. Second operand 23 states. [2020-08-21 20:31:50,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:50,221 INFO L93 Difference]: Finished difference Result 465 states and 632 transitions. [2020-08-21 20:31:50,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 20:31:50,222 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 110 [2020-08-21 20:31:50,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:50,224 INFO L225 Difference]: With dead ends: 465 [2020-08-21 20:31:50,224 INFO L226 Difference]: Without dead ends: 348 [2020-08-21 20:31:50,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=275, Invalid=277, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:31:50,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-08-21 20:31:50,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 191. [2020-08-21 20:31:50,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2020-08-21 20:31:50,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 275 transitions. [2020-08-21 20:31:50,247 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 275 transitions. Word has length 110 [2020-08-21 20:31:50,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:50,247 INFO L479 AbstractCegarLoop]: Abstraction has 191 states and 275 transitions. [2020-08-21 20:31:50,247 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 20:31:50,247 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 275 transitions. [2020-08-21 20:31:50,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-21 20:31:50,249 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:50,250 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:50,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 20:31:50,250 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:50,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:50,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1900219622, now seen corresponding path program 8 times [2020-08-21 20:31:50,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:50,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1067697682] [2020-08-21 20:31:50,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:50,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:50,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:50,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:50,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:50,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:50,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:50,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:50,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2020-08-21 20:31:50,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:50,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 88 [2020-08-21 20:31:50,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:50,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2020-08-21 20:31:50,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:50,899 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 4 proven. 578 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:50,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1067697682] [2020-08-21 20:31:50,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:50,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 20:31:50,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574862351] [2020-08-21 20:31:50,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 20:31:50,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:50,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 20:31:50,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:31:50,902 INFO L87 Difference]: Start difference. First operand 191 states and 275 transitions. Second operand 24 states. [2020-08-21 20:31:52,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:52,033 INFO L93 Difference]: Finished difference Result 382 states and 553 transitions. [2020-08-21 20:31:52,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 20:31:52,034 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 112 [2020-08-21 20:31:52,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:52,035 INFO L225 Difference]: With dead ends: 382 [2020-08-21 20:31:52,036 INFO L226 Difference]: Without dead ends: 268 [2020-08-21 20:31:52,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:31:52,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2020-08-21 20:31:52,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 192. [2020-08-21 20:31:52,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-08-21 20:31:52,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 277 transitions. [2020-08-21 20:31:52,056 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 277 transitions. Word has length 112 [2020-08-21 20:31:52,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:52,058 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 277 transitions. [2020-08-21 20:31:52,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 20:31:52,058 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 277 transitions. [2020-08-21 20:31:52,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2020-08-21 20:31:52,060 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:52,061 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 20, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:52,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 20:31:52,061 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:52,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:52,062 INFO L82 PathProgramCache]: Analyzing trace with hash -920938102, now seen corresponding path program 8 times [2020-08-21 20:31:52,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:52,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557195311] [2020-08-21 20:31:52,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:52,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:52,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:52,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:52,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2020-08-21 20:31:52,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89 [2020-08-21 20:31:52,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 99 [2020-08-21 20:31:52,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,525 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 4 proven. 618 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:52,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557195311] [2020-08-21 20:31:52,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:52,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 20:31:52,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651702712] [2020-08-21 20:31:52,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 20:31:52,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:52,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 20:31:52,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=277, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:31:52,527 INFO L87 Difference]: Start difference. First operand 192 states and 277 transitions. Second operand 24 states. [2020-08-21 20:31:52,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:52,899 INFO L93 Difference]: Finished difference Result 482 states and 655 transitions. [2020-08-21 20:31:52,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 20:31:52,900 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 113 [2020-08-21 20:31:52,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:52,902 INFO L225 Difference]: With dead ends: 482 [2020-08-21 20:31:52,902 INFO L226 Difference]: Without dead ends: 362 [2020-08-21 20:31:52,903 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=299, Invalid=301, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:31:52,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2020-08-21 20:31:52,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 197. [2020-08-21 20:31:52,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-08-21 20:31:52,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 284 transitions. [2020-08-21 20:31:52,920 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 284 transitions. Word has length 113 [2020-08-21 20:31:52,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:52,921 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 284 transitions. [2020-08-21 20:31:52,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 20:31:52,921 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 284 transitions. [2020-08-21 20:31:52,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-08-21 20:31:52,922 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:52,922 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:52,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 20:31:52,923 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:52,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:52,923 INFO L82 PathProgramCache]: Analyzing trace with hash 188512361, now seen corresponding path program 9 times [2020-08-21 20:31:52,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:52,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1387179155] [2020-08-21 20:31:52,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:52,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:52,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:52,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:52,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:53,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 84 [2020-08-21 20:31:53,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:53,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91 [2020-08-21 20:31:53,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:53,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101 [2020-08-21 20:31:53,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:53,579 INFO L134 CoverageAnalysis]: Checked inductivity of 660 backedges. 4 proven. 638 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:53,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1387179155] [2020-08-21 20:31:53,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:53,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 20:31:53,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979135169] [2020-08-21 20:31:53,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 20:31:53,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:53,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 20:31:53,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:31:53,581 INFO L87 Difference]: Start difference. First operand 197 states and 284 transitions. Second operand 25 states. [2020-08-21 20:31:54,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:54,803 INFO L93 Difference]: Finished difference Result 394 states and 571 transitions. [2020-08-21 20:31:54,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 20:31:54,804 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 115 [2020-08-21 20:31:54,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:54,805 INFO L225 Difference]: With dead ends: 394 [2020-08-21 20:31:54,805 INFO L226 Difference]: Without dead ends: 277 [2020-08-21 20:31:54,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=114, Invalid=536, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:31:54,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2020-08-21 20:31:54,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 198. [2020-08-21 20:31:54,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2020-08-21 20:31:54,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 286 transitions. [2020-08-21 20:31:54,825 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 286 transitions. Word has length 115 [2020-08-21 20:31:54,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:54,826 INFO L479 AbstractCegarLoop]: Abstraction has 198 states and 286 transitions. [2020-08-21 20:31:54,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 20:31:54,826 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 286 transitions. [2020-08-21 20:31:54,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-21 20:31:54,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:54,827 INFO L422 BasicCegarLoop]: trace histogram [22, 21, 21, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:54,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 20:31:54,828 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:54,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:54,828 INFO L82 PathProgramCache]: Analyzing trace with hash -594756069, now seen corresponding path program 9 times [2020-08-21 20:31:54,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:54,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513681683] [2020-08-21 20:31:54,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:54,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:54,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:54,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:54,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:54,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:54,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:54,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85 [2020-08-21 20:31:55,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 92 [2020-08-21 20:31:55,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 102 [2020-08-21 20:31:55,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,348 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 4 proven. 680 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:55,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513681683] [2020-08-21 20:31:55,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:55,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 20:31:55,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915138599] [2020-08-21 20:31:55,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 20:31:55,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:55,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 20:31:55,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=301, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:31:55,350 INFO L87 Difference]: Start difference. First operand 198 states and 286 transitions. Second operand 25 states. [2020-08-21 20:31:55,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:55,693 INFO L93 Difference]: Finished difference Result 499 states and 678 transitions. [2020-08-21 20:31:55,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 20:31:55,700 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 116 [2020-08-21 20:31:55,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:55,702 INFO L225 Difference]: With dead ends: 499 [2020-08-21 20:31:55,702 INFO L226 Difference]: Without dead ends: 376 [2020-08-21 20:31:55,704 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=324, Invalid=326, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:31:55,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-08-21 20:31:55,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 203. [2020-08-21 20:31:55,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2020-08-21 20:31:55,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 293 transitions. [2020-08-21 20:31:55,722 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 293 transitions. Word has length 116 [2020-08-21 20:31:55,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:55,723 INFO L479 AbstractCegarLoop]: Abstraction has 203 states and 293 transitions. [2020-08-21 20:31:55,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 20:31:55,723 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 293 transitions. [2020-08-21 20:31:55,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-21 20:31:55,724 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:55,724 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:55,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 20:31:55,725 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:55,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:55,725 INFO L82 PathProgramCache]: Analyzing trace with hash 116833466, now seen corresponding path program 10 times [2020-08-21 20:31:55,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:55,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1890345857] [2020-08-21 20:31:55,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:55,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:55,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:55,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:55,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:56,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87 [2020-08-21 20:31:56,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:56,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 94 [2020-08-21 20:31:56,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:56,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 104 [2020-08-21 20:31:56,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:56,424 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 4 proven. 701 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:56,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1890345857] [2020-08-21 20:31:56,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:56,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 20:31:56,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964536343] [2020-08-21 20:31:56,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 20:31:56,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:56,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 20:31:56,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:31:56,427 INFO L87 Difference]: Start difference. First operand 203 states and 293 transitions. Second operand 26 states. [2020-08-21 20:31:57,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:57,746 INFO L93 Difference]: Finished difference Result 406 states and 589 transitions. [2020-08-21 20:31:57,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 20:31:57,756 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 118 [2020-08-21 20:31:57,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:57,763 INFO L225 Difference]: With dead ends: 406 [2020-08-21 20:31:57,763 INFO L226 Difference]: Without dead ends: 286 [2020-08-21 20:31:57,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:31:57,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-08-21 20:31:57,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 204. [2020-08-21 20:31:57,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-08-21 20:31:57,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 295 transitions. [2020-08-21 20:31:57,795 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 295 transitions. Word has length 118 [2020-08-21 20:31:57,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:57,796 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 295 transitions. [2020-08-21 20:31:57,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 20:31:57,796 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 295 transitions. [2020-08-21 20:31:57,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2020-08-21 20:31:57,797 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:57,797 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:57,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 20:31:57,797 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:57,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:57,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1478165482, now seen corresponding path program 10 times [2020-08-21 20:31:57,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:57,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1645261843] [2020-08-21 20:31:57,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:57,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:57,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:57,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:57,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:57,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:57,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:57,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:58,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 88 [2020-08-21 20:31:58,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:58,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95 [2020-08-21 20:31:58,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:58,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105 [2020-08-21 20:31:58,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:58,343 INFO L134 CoverageAnalysis]: Checked inductivity of 767 backedges. 4 proven. 745 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:58,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1645261843] [2020-08-21 20:31:58,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:58,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 20:31:58,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867548475] [2020-08-21 20:31:58,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 20:31:58,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:58,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 20:31:58,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=326, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:31:58,345 INFO L87 Difference]: Start difference. First operand 204 states and 295 transitions. Second operand 26 states. [2020-08-21 20:31:58,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:58,640 INFO L93 Difference]: Finished difference Result 516 states and 701 transitions. [2020-08-21 20:31:58,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 20:31:58,644 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 119 [2020-08-21 20:31:58,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:58,646 INFO L225 Difference]: With dead ends: 516 [2020-08-21 20:31:58,647 INFO L226 Difference]: Without dead ends: 390 [2020-08-21 20:31:58,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=350, Invalid=352, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:31:58,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2020-08-21 20:31:58,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 209. [2020-08-21 20:31:58,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2020-08-21 20:31:58,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 302 transitions. [2020-08-21 20:31:58,667 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 302 transitions. Word has length 119 [2020-08-21 20:31:58,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:58,667 INFO L479 AbstractCegarLoop]: Abstraction has 209 states and 302 transitions. [2020-08-21 20:31:58,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 20:31:58,668 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 302 transitions. [2020-08-21 20:31:58,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-08-21 20:31:58,669 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:58,669 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:58,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 20:31:58,669 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:58,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:58,669 INFO L82 PathProgramCache]: Analyzing trace with hash -670381367, now seen corresponding path program 11 times [2020-08-21 20:31:58,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:58,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1268267034] [2020-08-21 20:31:58,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:58,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:58,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:58,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:58,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:58,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:58,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:58,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:59,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2020-08-21 20:31:59,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:59,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97 [2020-08-21 20:31:59,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:59,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 107 [2020-08-21 20:31:59,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:59,415 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 4 proven. 767 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:59,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1268267034] [2020-08-21 20:31:59,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:59,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 20:31:59,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404636164] [2020-08-21 20:31:59,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 20:31:59,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:59,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 20:31:59,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=605, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:31:59,417 INFO L87 Difference]: Start difference. First operand 209 states and 302 transitions. Second operand 27 states. [2020-08-21 20:32:00,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:00,877 INFO L93 Difference]: Finished difference Result 418 states and 607 transitions. [2020-08-21 20:32:00,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 20:32:00,878 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 121 [2020-08-21 20:32:00,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:00,880 INFO L225 Difference]: With dead ends: 418 [2020-08-21 20:32:00,880 INFO L226 Difference]: Without dead ends: 295 [2020-08-21 20:32:00,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=124, Invalid=632, Unknown=0, NotChecked=0, Total=756 [2020-08-21 20:32:00,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2020-08-21 20:32:00,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 210. [2020-08-21 20:32:00,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2020-08-21 20:32:00,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 304 transitions. [2020-08-21 20:32:00,909 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 304 transitions. Word has length 121 [2020-08-21 20:32:00,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:00,910 INFO L479 AbstractCegarLoop]: Abstraction has 210 states and 304 transitions. [2020-08-21 20:32:00,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 20:32:00,910 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 304 transitions. [2020-08-21 20:32:00,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-21 20:32:00,911 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:00,911 INFO L422 BasicCegarLoop]: trace histogram [24, 23, 23, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:00,911 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-21 20:32:00,912 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:00,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:00,912 INFO L82 PathProgramCache]: Analyzing trace with hash -1450657861, now seen corresponding path program 11 times [2020-08-21 20:32:00,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:00,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1389518270] [2020-08-21 20:32:00,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:00,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:00,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:00,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:00,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:00,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:00,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:00,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91 [2020-08-21 20:32:01,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2020-08-21 20:32:01,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 108 [2020-08-21 20:32:01,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,488 INFO L134 CoverageAnalysis]: Checked inductivity of 835 backedges. 4 proven. 813 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:32:01,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1389518270] [2020-08-21 20:32:01,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:01,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 20:32:01,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163981344] [2020-08-21 20:32:01,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 20:32:01,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:01,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 20:32:01,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=352, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:32:01,490 INFO L87 Difference]: Start difference. First operand 210 states and 304 transitions. Second operand 27 states. [2020-08-21 20:32:01,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:01,937 INFO L93 Difference]: Finished difference Result 533 states and 724 transitions. [2020-08-21 20:32:01,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 20:32:01,938 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 122 [2020-08-21 20:32:01,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:01,940 INFO L225 Difference]: With dead ends: 533 [2020-08-21 20:32:01,940 INFO L226 Difference]: Without dead ends: 404 [2020-08-21 20:32:01,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=377, Invalid=379, Unknown=0, NotChecked=0, Total=756 [2020-08-21 20:32:01,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2020-08-21 20:32:01,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 215. [2020-08-21 20:32:01,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-08-21 20:32:01,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 311 transitions. [2020-08-21 20:32:01,960 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 311 transitions. Word has length 122 [2020-08-21 20:32:01,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:01,960 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 311 transitions. [2020-08-21 20:32:01,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 20:32:01,960 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 311 transitions. [2020-08-21 20:32:01,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-21 20:32:01,961 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:01,961 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:01,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-21 20:32:01,961 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:01,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:01,962 INFO L82 PathProgramCache]: Analyzing trace with hash -2066035110, now seen corresponding path program 12 times [2020-08-21 20:32:01,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:01,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1578512858] [2020-08-21 20:32:01,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:01,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:02,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:02,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:02,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:02,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:02,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 110 [2020-08-21 20:32:02,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,147 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 846 trivial. 0 not checked. [2020-08-21 20:32:02,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1578512858] [2020-08-21 20:32:02,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:32:02,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-08-21 20:32:02,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185624583] [2020-08-21 20:32:02,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:32:02,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:02,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:32:02,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:32:02,149 INFO L87 Difference]: Start difference. First operand 215 states and 311 transitions. Second operand 10 states. [2020-08-21 20:32:02,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:02,512 INFO L93 Difference]: Finished difference Result 271 states and 393 transitions. [2020-08-21 20:32:02,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:32:02,513 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 124 [2020-08-21 20:32:02,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:02,516 INFO L225 Difference]: With dead ends: 271 [2020-08-21 20:32:02,516 INFO L226 Difference]: Without dead ends: 261 [2020-08-21 20:32:02,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:32:02,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2020-08-21 20:32:02,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 241. [2020-08-21 20:32:02,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2020-08-21 20:32:02,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 355 transitions. [2020-08-21 20:32:02,542 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 355 transitions. Word has length 124 [2020-08-21 20:32:02,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:02,543 INFO L479 AbstractCegarLoop]: Abstraction has 241 states and 355 transitions. [2020-08-21 20:32:02,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:32:02,544 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 355 transitions. [2020-08-21 20:32:02,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-21 20:32:02,545 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:02,545 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:02,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-21 20:32:02,546 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:02,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:02,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1807869672, now seen corresponding path program 1 times [2020-08-21 20:32:02,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:02,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765629269] [2020-08-21 20:32:02,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:02,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:02,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:02,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:02,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:02,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:02,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 110 [2020-08-21 20:32:02,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,821 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 849 trivial. 0 not checked. [2020-08-21 20:32:02,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765629269] [2020-08-21 20:32:02,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:02,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:32:02,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166670012] [2020-08-21 20:32:02,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:32:02,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:02,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:32:02,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:32:02,823 INFO L87 Difference]: Start difference. First operand 241 states and 355 transitions. Second operand 10 states. [2020-08-21 20:32:03,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:03,047 INFO L93 Difference]: Finished difference Result 285 states and 429 transitions. [2020-08-21 20:32:03,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:32:03,048 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 124 [2020-08-21 20:32:03,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:03,051 INFO L225 Difference]: With dead ends: 285 [2020-08-21 20:32:03,051 INFO L226 Difference]: Without dead ends: 280 [2020-08-21 20:32:03,052 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:32:03,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-08-21 20:32:03,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 265. [2020-08-21 20:32:03,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 265 states. [2020-08-21 20:32:03,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 402 transitions. [2020-08-21 20:32:03,080 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 402 transitions. Word has length 124 [2020-08-21 20:32:03,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:03,081 INFO L479 AbstractCegarLoop]: Abstraction has 265 states and 402 transitions. [2020-08-21 20:32:03,081 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:32:03,081 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 402 transitions. [2020-08-21 20:32:03,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 20:32:03,083 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:03,083 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:03,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-21 20:32:03,084 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:03,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:03,084 INFO L82 PathProgramCache]: Analyzing trace with hash 1864277052, now seen corresponding path program 1 times [2020-08-21 20:32:03,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:03,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1160383373] [2020-08-21 20:32:03,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:03,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:03,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:03,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:03,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:03,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:03,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 110 [2020-08-21 20:32:03,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,176 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2020-08-21 20:32:03,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1160383373] [2020-08-21 20:32:03,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:32:03,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 20:32:03,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575208973] [2020-08-21 20:32:03,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:32:03,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:03,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:32:03,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:32:03,178 INFO L87 Difference]: Start difference. First operand 265 states and 402 transitions. Second operand 6 states. [2020-08-21 20:32:03,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:03,234 INFO L93 Difference]: Finished difference Result 271 states and 407 transitions. [2020-08-21 20:32:03,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:32:03,235 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 126 [2020-08-21 20:32:03,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:03,237 INFO L225 Difference]: With dead ends: 271 [2020-08-21 20:32:03,238 INFO L226 Difference]: Without dead ends: 265 [2020-08-21 20:32:03,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:32:03,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2020-08-21 20:32:03,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 265. [2020-08-21 20:32:03,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 265 states. [2020-08-21 20:32:03,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 401 transitions. [2020-08-21 20:32:03,267 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 401 transitions. Word has length 126 [2020-08-21 20:32:03,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:03,267 INFO L479 AbstractCegarLoop]: Abstraction has 265 states and 401 transitions. [2020-08-21 20:32:03,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:32:03,268 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 401 transitions. [2020-08-21 20:32:03,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 20:32:03,269 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:03,270 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:03,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-21 20:32:03,270 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:03,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:03,270 INFO L82 PathProgramCache]: Analyzing trace with hash 1807018750, now seen corresponding path program 1 times [2020-08-21 20:32:03,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:03,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1620296754] [2020-08-21 20:32:03,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:03,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:03,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:03,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:03,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:03,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:03,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 110 [2020-08-21 20:32:03,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,526 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 849 trivial. 0 not checked. [2020-08-21 20:32:03,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1620296754] [2020-08-21 20:32:03,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:03,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:32:03,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525321231] [2020-08-21 20:32:03,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:32:03,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:03,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:32:03,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:32:03,528 INFO L87 Difference]: Start difference. First operand 265 states and 401 transitions. Second operand 12 states. [2020-08-21 20:32:03,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:03,785 INFO L93 Difference]: Finished difference Result 284 states and 423 transitions. [2020-08-21 20:32:03,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:32:03,786 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 126 [2020-08-21 20:32:03,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:03,788 INFO L225 Difference]: With dead ends: 284 [2020-08-21 20:32:03,788 INFO L226 Difference]: Without dead ends: 274 [2020-08-21 20:32:03,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:32:03,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-08-21 20:32:03,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 271. [2020-08-21 20:32:03,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 271 states. [2020-08-21 20:32:03,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 408 transitions. [2020-08-21 20:32:03,818 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 408 transitions. Word has length 126 [2020-08-21 20:32:03,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:03,818 INFO L479 AbstractCegarLoop]: Abstraction has 271 states and 408 transitions. [2020-08-21 20:32:03,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:32:03,819 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 408 transitions. [2020-08-21 20:32:03,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-08-21 20:32:03,821 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:03,821 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:03,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-21 20:32:03,821 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:03,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:03,821 INFO L82 PathProgramCache]: Analyzing trace with hash -93481782, now seen corresponding path program 1 times [2020-08-21 20:32:03,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:03,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [814025975] [2020-08-21 20:32:03,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:03,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:03,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:03,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:03,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:03,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:03,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 110 [2020-08-21 20:32:03,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,968 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 849 trivial. 0 not checked. [2020-08-21 20:32:03,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [814025975] [2020-08-21 20:32:03,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:32:03,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-21 20:32:03,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980704795] [2020-08-21 20:32:03,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:32:03,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:03,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:32:03,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:32:03,970 INFO L87 Difference]: Start difference. First operand 271 states and 408 transitions. Second operand 8 states. [2020-08-21 20:32:04,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:04,089 INFO L93 Difference]: Finished difference Result 303 states and 449 transitions. [2020-08-21 20:32:04,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:32:04,089 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 127 [2020-08-21 20:32:04,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:04,092 INFO L225 Difference]: With dead ends: 303 [2020-08-21 20:32:04,092 INFO L226 Difference]: Without dead ends: 280 [2020-08-21 20:32:04,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:32:04,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-08-21 20:32:04,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 253. [2020-08-21 20:32:04,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 253 states. [2020-08-21 20:32:04,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 367 transitions. [2020-08-21 20:32:04,123 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 367 transitions. Word has length 127 [2020-08-21 20:32:04,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:04,124 INFO L479 AbstractCegarLoop]: Abstraction has 253 states and 367 transitions. [2020-08-21 20:32:04,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:32:04,124 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 367 transitions. [2020-08-21 20:32:04,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-21 20:32:04,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:04,126 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:04,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-21 20:32:04,126 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:04,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:04,126 INFO L82 PathProgramCache]: Analyzing trace with hash 2078176781, now seen corresponding path program 1 times [2020-08-21 20:32:04,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:04,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1181669057] [2020-08-21 20:32:04,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:04,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:04,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:04,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-21 20:32:04,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97 [2020-08-21 20:32:04,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 104 [2020-08-21 20:32:04,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 114 [2020-08-21 20:32:04,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,254 INFO L134 CoverageAnalysis]: Checked inductivity of 860 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 846 trivial. 0 not checked. [2020-08-21 20:32:04,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1181669057] [2020-08-21 20:32:04,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:04,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 20:32:04,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752676618] [2020-08-21 20:32:04,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:32:04,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:04,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:32:04,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:32:04,256 INFO L87 Difference]: Start difference. First operand 253 states and 367 transitions. Second operand 5 states. [2020-08-21 20:32:04,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:04,352 INFO L93 Difference]: Finished difference Result 409 states and 589 transitions. [2020-08-21 20:32:04,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 20:32:04,353 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 128 [2020-08-21 20:32:04,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:04,354 INFO L225 Difference]: With dead ends: 409 [2020-08-21 20:32:04,354 INFO L226 Difference]: Without dead ends: 155 [2020-08-21 20:32:04,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:32:04,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-08-21 20:32:04,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 140. [2020-08-21 20:32:04,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-08-21 20:32:04,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 202 transitions. [2020-08-21 20:32:04,372 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 202 transitions. Word has length 128 [2020-08-21 20:32:04,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:04,373 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 202 transitions. [2020-08-21 20:32:04,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:32:04,373 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 202 transitions. [2020-08-21 20:32:04,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2020-08-21 20:32:04,374 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:04,374 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:04,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-21 20:32:04,375 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:04,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:04,375 INFO L82 PathProgramCache]: Analyzing trace with hash 273720313, now seen corresponding path program 1 times [2020-08-21 20:32:04,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:04,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [550016575] [2020-08-21 20:32:04,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:04,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:04,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:04,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:04,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:04,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:04,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 114 [2020-08-21 20:32:04,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,554 INFO L134 CoverageAnalysis]: Checked inductivity of 859 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 850 trivial. 0 not checked. [2020-08-21 20:32:04,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [550016575] [2020-08-21 20:32:04,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:32:04,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-21 20:32:04,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158032647] [2020-08-21 20:32:04,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:32:04,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:04,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:32:04,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:32:04,556 INFO L87 Difference]: Start difference. First operand 140 states and 202 transitions. Second operand 8 states. [2020-08-21 20:32:04,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:04,664 INFO L93 Difference]: Finished difference Result 158 states and 221 transitions. [2020-08-21 20:32:04,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:32:04,665 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 131 [2020-08-21 20:32:04,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:04,667 INFO L225 Difference]: With dead ends: 158 [2020-08-21 20:32:04,667 INFO L226 Difference]: Without dead ends: 143 [2020-08-21 20:32:04,667 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:32:04,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2020-08-21 20:32:04,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 140. [2020-08-21 20:32:04,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-08-21 20:32:04,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 202 transitions. [2020-08-21 20:32:04,684 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 202 transitions. Word has length 131 [2020-08-21 20:32:04,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:04,684 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 202 transitions. [2020-08-21 20:32:04,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:32:04,684 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 202 transitions. [2020-08-21 20:32:04,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2020-08-21 20:32:04,685 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:04,686 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:04,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-21 20:32:04,686 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:04,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:04,686 INFO L82 PathProgramCache]: Analyzing trace with hash 757405757, now seen corresponding path program 1 times [2020-08-21 20:32:04,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:04,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1893171796] [2020-08-21 20:32:04,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:04,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:04,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:04,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:04,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:04,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:04,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 114 [2020-08-21 20:32:04,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,848 INFO L134 CoverageAnalysis]: Checked inductivity of 860 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 851 trivial. 0 not checked. [2020-08-21 20:32:04,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1893171796] [2020-08-21 20:32:04,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:04,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:32:04,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131600597] [2020-08-21 20:32:04,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:32:04,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:04,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:32:04,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:32:04,850 INFO L87 Difference]: Start difference. First operand 140 states and 202 transitions. Second operand 9 states. [2020-08-21 20:32:04,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:04,968 INFO L93 Difference]: Finished difference Result 176 states and 245 transitions. [2020-08-21 20:32:04,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:32:04,969 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 131 [2020-08-21 20:32:04,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:04,970 INFO L225 Difference]: With dead ends: 176 [2020-08-21 20:32:04,970 INFO L226 Difference]: Without dead ends: 166 [2020-08-21 20:32:04,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:32:04,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-08-21 20:32:04,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 160. [2020-08-21 20:32:04,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-08-21 20:32:04,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 229 transitions. [2020-08-21 20:32:04,998 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 229 transitions. Word has length 131 [2020-08-21 20:32:04,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:04,999 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 229 transitions. [2020-08-21 20:32:04,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:32:04,999 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 229 transitions. [2020-08-21 20:32:05,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2020-08-21 20:32:05,000 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:05,000 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:05,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-21 20:32:05,000 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:05,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:05,001 INFO L82 PathProgramCache]: Analyzing trace with hash -522457921, now seen corresponding path program 1 times [2020-08-21 20:32:05,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:05,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260831094] [2020-08-21 20:32:05,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:05,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:05,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:05,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:05,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:05,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:05,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 114 [2020-08-21 20:32:05,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,164 INFO L134 CoverageAnalysis]: Checked inductivity of 860 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 851 trivial. 0 not checked. [2020-08-21 20:32:05,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260831094] [2020-08-21 20:32:05,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:05,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:32:05,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747395221] [2020-08-21 20:32:05,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:32:05,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:05,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:32:05,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:32:05,165 INFO L87 Difference]: Start difference. First operand 160 states and 229 transitions. Second operand 9 states. [2020-08-21 20:32:05,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:05,335 INFO L93 Difference]: Finished difference Result 170 states and 238 transitions. [2020-08-21 20:32:05,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:32:05,336 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 131 [2020-08-21 20:32:05,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:05,338 INFO L225 Difference]: With dead ends: 170 [2020-08-21 20:32:05,338 INFO L226 Difference]: Without dead ends: 150 [2020-08-21 20:32:05,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:32:05,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-08-21 20:32:05,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 140. [2020-08-21 20:32:05,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-08-21 20:32:05,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 176 transitions. [2020-08-21 20:32:05,357 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 176 transitions. Word has length 131 [2020-08-21 20:32:05,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:05,358 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 176 transitions. [2020-08-21 20:32:05,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:32:05,358 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 176 transitions. [2020-08-21 20:32:05,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-08-21 20:32:05,359 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:05,359 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:05,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-21 20:32:05,360 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:05,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:05,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1688456428, now seen corresponding path program 1 times [2020-08-21 20:32:05,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:05,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [4746809] [2020-08-21 20:32:05,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:05,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:05,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:05,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:05,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:05,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 104 [2020-08-21 20:32:05,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 118 [2020-08-21 20:32:05,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,506 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 855 trivial. 0 not checked. [2020-08-21 20:32:05,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [4746809] [2020-08-21 20:32:05,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:05,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:32:05,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901239501] [2020-08-21 20:32:05,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:32:05,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:05,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:32:05,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:32:05,508 INFO L87 Difference]: Start difference. First operand 140 states and 176 transitions. Second operand 8 states. [2020-08-21 20:32:05,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:05,596 INFO L93 Difference]: Finished difference Result 173 states and 216 transitions. [2020-08-21 20:32:05,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 20:32:05,597 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 135 [2020-08-21 20:32:05,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:05,598 INFO L225 Difference]: With dead ends: 173 [2020-08-21 20:32:05,598 INFO L226 Difference]: Without dead ends: 163 [2020-08-21 20:32:05,599 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:32:05,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-08-21 20:32:05,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-08-21 20:32:05,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-08-21 20:32:05,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 200 transitions. [2020-08-21 20:32:05,616 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 200 transitions. Word has length 135 [2020-08-21 20:32:05,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:05,617 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 200 transitions. [2020-08-21 20:32:05,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:32:05,617 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 200 transitions. [2020-08-21 20:32:05,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-08-21 20:32:05,618 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:05,618 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:05,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-08-21 20:32:05,618 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:05,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:05,619 INFO L82 PathProgramCache]: Analyzing trace with hash 408592750, now seen corresponding path program 1 times [2020-08-21 20:32:05,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:05,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826325246] [2020-08-21 20:32:05,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:05,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:05,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:05,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:05,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:05,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 104 [2020-08-21 20:32:05,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 118 [2020-08-21 20:32:05,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,842 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 855 trivial. 0 not checked. [2020-08-21 20:32:05,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826325246] [2020-08-21 20:32:05,843 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:05,843 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:32:05,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579974673] [2020-08-21 20:32:05,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:32:05,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:05,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:32:05,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:32:05,844 INFO L87 Difference]: Start difference. First operand 157 states and 200 transitions. Second operand 9 states. [2020-08-21 20:32:06,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:06,000 INFO L93 Difference]: Finished difference Result 157 states and 200 transitions. [2020-08-21 20:32:06,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:32:06,001 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 135 [2020-08-21 20:32:06,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:06,001 INFO L225 Difference]: With dead ends: 157 [2020-08-21 20:32:06,001 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 20:32:06,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:32:06,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 20:32:06,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 20:32:06,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 20:32:06,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 20:32:06,004 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 135 [2020-08-21 20:32:06,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:06,004 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 20:32:06,004 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:32:06,004 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 20:32:06,005 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 20:32:06,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2020-08-21 20:32:06,008 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 20:32:12,150 WARN L193 SmtUtils]: Spent 6.12 s on a formula simplification. DAG size of input: 558 DAG size of output: 226 [2020-08-21 20:32:13,559 WARN L193 SmtUtils]: Spent 1.41 s on a formula simplification. DAG size of input: 393 DAG size of output: 20 [2020-08-21 20:32:13,842 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 598 DAG size of output: 136