/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 produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options interpolation-heuristic=FIRST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 11:31:01,998 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 11:31:02,002 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 11:31:02,028 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 11:31:02,028 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 11:31:02,029 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 11:31:02,031 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 11:31:02,033 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 11:31:02,035 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 11:31:02,036 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 11:31:02,037 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 11:31:02,038 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 11:31:02,039 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 11:31:02,040 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 11:31:02,041 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 11:31:02,042 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 11:31:02,043 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 11:31:02,044 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 11:31:02,046 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 11:31:02,048 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 11:31:02,049 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 11:31:02,051 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 11:31:02,052 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 11:31:02,053 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 11:31:02,055 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-21 11:31:02,055 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-21 11:31:02,056 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-21 11:31:02,057 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-21 11:31:02,057 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-21 11:31:02,060 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-21 11:31:02,061 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-21 11:31:02,062 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-21 11:31:02,062 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-21 11:31:02,064 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-21 11:31:02,066 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-21 11:31:02,066 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-21 11:31:02,067 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-21 11:31:02,068 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-21 11:31:02,068 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 11:31:02,069 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 11:31:02,071 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 11:31:02,072 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 [2020-09-21 11:31:02,131 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 11:31:02,132 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 11:31:02,133 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 11:31:02,134 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 11:31:02,134 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 11:31:02,134 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 11:31:02,134 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 11:31:02,134 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 11:31:02,135 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 11:31:02,135 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 11:31:02,136 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 11:31:02,136 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 11:31:02,136 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 11:31:02,136 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 11:31:02,136 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 11:31:02,136 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 11:31:02,138 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 11:31:02,138 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 11:31:02,138 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 11:31:02,138 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 11:31:02,138 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 11:31:02,139 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 11:31:02,139 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 11:31:02,139 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 11:31:02,139 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 11:31:02,140 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 11:31:02,140 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 11:31:02,140 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 11:31:02,140 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 11:31:02,140 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 -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; [2020-09-21 11:31:02,661 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 11:31:02,679 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 11:31:02,684 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 11:31:02,686 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 11:31:02,686 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 11:31:02,687 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-09-21 11:31:02,777 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf40eec18/b2646b961f27436db4372f6c8a787dc1/FLAGb058d3850 [2020-09-21 11:31:03,311 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 11:31:03,312 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-09-21 11:31:03,320 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf40eec18/b2646b961f27436db4372f6c8a787dc1/FLAGb058d3850 [2020-09-21 11:31:03,639 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf40eec18/b2646b961f27436db4372f6c8a787dc1 [2020-09-21 11:31:03,655 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 11:31:03,661 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 11:31:03,664 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 11:31:03,664 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 11:31:03,668 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 11:31:03,670 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 11:31:03" (1/1) ... [2020-09-21 11:31:03,675 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@260ceee4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:03, skipping insertion in model container [2020-09-21 11:31:03,675 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 11:31:03" (1/1) ... [2020-09-21 11:31:03,685 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 11:31:03,715 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 11:31:03,935 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 11:31:03,941 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 11:31:03,967 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 11:31:03,989 INFO L208 MainTranslator]: Completed translation [2020-09-21 11:31:03,990 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:03 WrapperNode [2020-09-21 11:31:03,990 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 11:31:03,991 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 11:31:03,991 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 11:31:03,991 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 11:31:04,081 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:03" (1/1) ... [2020-09-21 11:31:04,082 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:03" (1/1) ... [2020-09-21 11:31:04,094 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:03" (1/1) ... [2020-09-21 11:31:04,100 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:03" (1/1) ... [2020-09-21 11:31:04,123 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:03" (1/1) ... [2020-09-21 11:31:04,130 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:03" (1/1) ... [2020-09-21 11:31:04,132 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:03" (1/1) ... [2020-09-21 11:31:04,134 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 11:31:04,135 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 11:31:04,135 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 11:31:04,135 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 11:31:04,136 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:03" (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 [2020-09-21 11:31:04,213 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 11:31:04,213 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 11:31:04,214 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-21 11:31:04,214 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 11:31:04,214 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 11:31:04,214 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-21 11:31:04,215 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-21 11:31:04,215 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-21 11:31:04,215 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-09-21 11:31:04,215 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 11:31:04,215 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-21 11:31:04,216 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-21 11:31:04,216 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-21 11:31:04,216 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-21 11:31:04,216 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 11:31:04,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 11:31:04,512 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 11:31:04,512 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-21 11:31:04,517 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 11:31:04 BoogieIcfgContainer [2020-09-21 11:31:04,517 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 11:31:04,519 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 11:31:04,519 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 11:31:04,522 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 11:31:04,523 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 11:31:03" (1/3) ... [2020-09-21 11:31:04,524 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a11b09d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 11:31:04, skipping insertion in model container [2020-09-21 11:31:04,524 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:31:03" (2/3) ... [2020-09-21 11:31:04,524 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a11b09d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 11:31:04, skipping insertion in model container [2020-09-21 11:31:04,525 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 11:31:04" (3/3) ... [2020-09-21 11:31:04,527 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-09-21 11:31:04,538 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 11:31:04,554 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 11:31:04,582 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 11:31:04,612 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 11:31:04,613 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 11:31:04,613 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 11:31:04,613 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 11:31:04,613 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 11:31:04,613 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 11:31:04,613 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 11:31:04,613 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 11:31:04,634 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-09-21 11:31:04,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-21 11:31:04,641 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:04,642 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:04,642 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:04,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:04,649 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-09-21 11:31:04,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:04,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [700768381] [2020-09-21 11:31:04,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:04,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:04,822 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:04,822 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:04,823 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:04,823 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:04,823 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 26 [2020-09-21 11:31:04,823 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:04,824 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 13 [2020-09-21 11:31:04,824 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:04,824 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:04,825 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-09-21 11:31:04,825 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:04,825 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:31:04,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:04,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:04,909 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:04,910 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:04,910 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:04,910 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:04,910 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-09-21 11:31:04,911 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:04,911 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:31:04,911 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:04,911 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:04,912 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:04,912 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:04,912 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:04,924 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:04,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [700768381] [2020-09-21 11:31:04,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 11:31:04,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 11:31:04,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140974781] [2020-09-21 11:31:04,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 11:31:04,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:04,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 11:31:04,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 11:31:04,952 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-09-21 11:31:05,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:05,102 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-09-21 11:31:05,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 11:31:05,105 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-09-21 11:31:05,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:05,120 INFO L225 Difference]: With dead ends: 51 [2020-09-21 11:31:05,120 INFO L226 Difference]: Without dead ends: 24 [2020-09-21 11:31:05,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 11:31:05,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-21 11:31:05,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-09-21 11:31:05,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-09-21 11:31:05,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-09-21 11:31:05,174 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-09-21 11:31:05,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:05,175 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-09-21 11:31:05,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 11:31:05,175 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-09-21 11:31:05,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-21 11:31:05,176 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:05,177 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:05,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 11:31:05,177 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:05,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:05,178 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-09-21 11:31:05,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:05,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [976599766] [2020-09-21 11:31:05,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:05,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:05,249 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:05,250 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:05,250 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:05,250 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:05,251 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 26 [2020-09-21 11:31:05,251 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:05,251 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 22 [2020-09-21 11:31:05,252 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:05,252 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-21 11:31:05,252 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-09-21 11:31:05,252 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 3 [2020-09-21 11:31:05,253 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:31:05,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:05,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:05,348 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:05,348 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:05,349 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:05,349 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:05,349 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-09-21 11:31:05,349 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:05,350 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:31:05,350 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:05,350 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:05,351 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:05,351 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:05,351 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:31:05,358 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:05,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [976599766] [2020-09-21 11:31:05,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 11:31:05,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 11:31:05,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882887419] [2020-09-21 11:31:05,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 11:31:05,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:05,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 11:31:05,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-21 11:31:05,363 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-09-21 11:31:05,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:05,469 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-09-21 11:31:05,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 11:31:05,470 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-09-21 11:31:05,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:05,473 INFO L225 Difference]: With dead ends: 44 [2020-09-21 11:31:05,474 INFO L226 Difference]: Without dead ends: 30 [2020-09-21 11:31:05,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 11:31:05,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-21 11:31:05,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-09-21 11:31:05,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-21 11:31:05,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-09-21 11:31:05,488 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-09-21 11:31:05,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:05,489 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-09-21 11:31:05,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 11:31:05,489 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-09-21 11:31:05,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-21 11:31:05,490 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:05,490 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:05,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 11:31:05,491 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:05,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:05,491 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-09-21 11:31:05,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:05,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690118404] [2020-09-21 11:31:05,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:05,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:05,538 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:05,538 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:05,538 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:05,539 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:05,539 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 28 [2020-09-21 11:31:05,540 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:05,540 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 14 [2020-09-21 11:31:05,540 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:05,540 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-21 11:31:05,541 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-09-21 11:31:05,541 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-09-21 11:31:05,541 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:31:05,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:05,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:05,611 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:05,612 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:05,612 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:05,612 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:05,613 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-09-21 11:31:05,613 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:05,613 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:31:05,613 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:05,614 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:05,614 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:05,614 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:05,614 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:31:05,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-21 11:31:05,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690118404] [2020-09-21 11:31:05,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 11:31:05,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 11:31:05,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721800997] [2020-09-21 11:31:05,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 11:31:05,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:05,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 11:31:05,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 11:31:05,623 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-09-21 11:31:05,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:05,753 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-09-21 11:31:05,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 11:31:05,754 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-09-21 11:31:05,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:05,755 INFO L225 Difference]: With dead ends: 37 [2020-09-21 11:31:05,755 INFO L226 Difference]: Without dead ends: 26 [2020-09-21 11:31:05,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-21 11:31:05,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-09-21 11:31:05,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-09-21 11:31:05,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-09-21 11:31:05,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-09-21 11:31:05,763 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-09-21 11:31:05,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:05,764 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-09-21 11:31:05,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 11:31:05,764 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-09-21 11:31:05,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-09-21 11:31:05,765 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:05,765 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:05,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 11:31:05,766 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:05,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:05,767 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-09-21 11:31:05,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:05,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [595678034] [2020-09-21 11:31:05,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:05,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:06,048 FATAL L256 erpolLogProxyWrapper]: Difference in size: 1 [2020-09-21 11:31:06,049 FATAL L256 erpolLogProxyWrapper]: Difference in depth: -1 [2020-09-21 11:31:06,049 FATAL L256 erpolLogProxyWrapper]: Difference in width: 1 [2020-09-21 11:31:06,049 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:06,049 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 30 [2020-09-21 11:31:06,050 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:06,050 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 211 [2020-09-21 11:31:06,050 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:06,050 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-09-21 11:31:06,051 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-09-21 11:31:06,051 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-09-21 11:31:06,051 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:06,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:06,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:06,528 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:06,529 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:06,529 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:06,529 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:06,529 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-09-21 11:31:06,530 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:06,530 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 11:31:06,530 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:06,530 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:06,530 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:06,532 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:06,533 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-09-21 11:31:06,540 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:06,541 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [595678034] [2020-09-21 11:31:06,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:31:06,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-21 11:31:06,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177475775] [2020-09-21 11:31:06,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-21 11:31:06,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:06,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-21 11:31:06,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-09-21 11:31:06,552 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 12 states. [2020-09-21 11:31:07,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:07,120 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2020-09-21 11:31:07,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-21 11:31:07,120 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2020-09-21 11:31:07,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:07,122 INFO L225 Difference]: With dead ends: 47 [2020-09-21 11:31:07,122 INFO L226 Difference]: Without dead ends: 45 [2020-09-21 11:31:07,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2020-09-21 11:31:07,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-09-21 11:31:07,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2020-09-21 11:31:07,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-09-21 11:31:07,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-09-21 11:31:07,133 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-09-21 11:31:07,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:07,133 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-09-21 11:31:07,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-21 11:31:07,134 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-09-21 11:31:07,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-09-21 11:31:07,135 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:07,135 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:07,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 11:31:07,136 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:07,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:07,136 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-09-21 11:31:07,136 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:07,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1958075444] [2020-09-21 11:31:07,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:07,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:07,177 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:07,177 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:07,178 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:07,178 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:07,178 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 32 [2020-09-21 11:31:07,178 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:07,179 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 22 [2020-09-21 11:31:07,179 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:07,179 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-09-21 11:31:07,179 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-09-21 11:31:07,179 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-09-21 11:31:07,180 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:07,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:07,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:07,232 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:07,233 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:07,233 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:07,233 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:07,233 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-09-21 11:31:07,234 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:07,234 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:31:07,234 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:07,234 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:07,235 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:07,235 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:07,235 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:07,239 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:07,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1958075444] [2020-09-21 11:31:07,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:31:07,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 11:31:07,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632565893] [2020-09-21 11:31:07,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 11:31:07,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:07,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 11:31:07,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-09-21 11:31:07,242 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-09-21 11:31:07,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:07,434 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-09-21 11:31:07,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 11:31:07,435 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-09-21 11:31:07,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:07,436 INFO L225 Difference]: With dead ends: 59 [2020-09-21 11:31:07,436 INFO L226 Difference]: Without dead ends: 48 [2020-09-21 11:31:07,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-09-21 11:31:07,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-09-21 11:31:07,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-09-21 11:31:07,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-21 11:31:07,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-09-21 11:31:07,446 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-09-21 11:31:07,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:07,447 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-09-21 11:31:07,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 11:31:07,447 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-09-21 11:31:07,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-09-21 11:31:07,448 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:07,448 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:07,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 11:31:07,449 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:07,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:07,449 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-09-21 11:31:07,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:07,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563926438] [2020-09-21 11:31:07,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:07,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:07,609 FATAL L256 erpolLogProxyWrapper]: Difference in size: 1 [2020-09-21 11:31:07,610 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:07,610 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:07,610 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:07,610 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 34 [2020-09-21 11:31:07,611 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:07,611 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 135 [2020-09-21 11:31:07,611 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:07,611 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-09-21 11:31:07,612 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-09-21 11:31:07,612 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 19 [2020-09-21 11:31:07,612 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:08,004 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 27 [2020-09-21 11:31:08,218 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 39 [2020-09-21 11:31:08,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:08,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:08,453 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:08,454 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:08,454 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:08,454 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:08,454 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-09-21 11:31:08,455 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:08,455 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:31:08,455 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:08,455 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:08,456 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:08,456 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:08,456 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:08,463 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:08,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563926438] [2020-09-21 11:31:08,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:31:08,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 11:31:08,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887237368] [2020-09-21 11:31:08,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 11:31:08,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:08,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 11:31:08,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-09-21 11:31:08,466 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 14 states. [2020-09-21 11:31:09,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:09,525 INFO L93 Difference]: Finished difference Result 82 states and 91 transitions. [2020-09-21 11:31:09,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-21 11:31:09,526 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 25 [2020-09-21 11:31:09,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:09,530 INFO L225 Difference]: With dead ends: 82 [2020-09-21 11:31:09,530 INFO L226 Difference]: Without dead ends: 80 [2020-09-21 11:31:09,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-09-21 11:31:09,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-09-21 11:31:09,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 46. [2020-09-21 11:31:09,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-09-21 11:31:09,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-09-21 11:31:09,541 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-09-21 11:31:09,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:09,542 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-09-21 11:31:09,542 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 11:31:09,542 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-09-21 11:31:09,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-09-21 11:31:09,543 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:09,543 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:09,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 11:31:09,543 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:09,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:09,544 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-09-21 11:31:09,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:09,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [217817896] [2020-09-21 11:31:09,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:09,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:09,583 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:09,583 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:09,583 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:09,584 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:09,584 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 36 [2020-09-21 11:31:09,584 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:09,584 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 23 [2020-09-21 11:31:09,584 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:09,584 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-09-21 11:31:09,585 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-09-21 11:31:09,585 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 14 [2020-09-21 11:31:09,585 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:09,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:09,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:09,637 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:09,637 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:09,637 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:09,637 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:09,637 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-09-21 11:31:09,638 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:09,638 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:31:09,638 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:09,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:09,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:09,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:09,638 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:09,642 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:09,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [217817896] [2020-09-21 11:31:09,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:31:09,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 11:31:09,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460177378] [2020-09-21 11:31:09,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 11:31:09,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:09,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 11:31:09,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-21 11:31:09,644 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-09-21 11:31:09,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:09,855 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-09-21 11:31:09,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 11:31:09,856 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-09-21 11:31:09,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:09,857 INFO L225 Difference]: With dead ends: 74 [2020-09-21 11:31:09,857 INFO L226 Difference]: Without dead ends: 63 [2020-09-21 11:31:09,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-09-21 11:31:09,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-09-21 11:31:09,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-09-21 11:31:09,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-09-21 11:31:09,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-09-21 11:31:09,867 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-09-21 11:31:09,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:09,867 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-09-21 11:31:09,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 11:31:09,868 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-09-21 11:31:09,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-21 11:31:09,869 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:09,869 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:09,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 11:31:09,869 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:09,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:09,870 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-09-21 11:31:09,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:09,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [496573525] [2020-09-21 11:31:09,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:09,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:09,900 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:09,900 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:09,900 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:09,900 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:09,901 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-09-21 11:31:09,901 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:09,901 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 15 [2020-09-21 11:31:09,901 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:09,902 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-09-21 11:31:09,902 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-09-21 11:31:09,902 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 20 [2020-09-21 11:31:09,902 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:09,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:09,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:09,952 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:09,953 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:09,953 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:09,953 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:09,953 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-09-21 11:31:09,953 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:09,954 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:31:09,954 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:09,954 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:09,954 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:09,954 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:09,955 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:09,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-09-21 11:31:09,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:09,960 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:09,961 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:09,961 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:09,961 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:09,962 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-21 11:31:09,962 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:09,962 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 11:31:09,962 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:09,962 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-21 11:31:09,963 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:09,963 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-21 11:31:09,963 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:09,967 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-21 11:31:09,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [496573525] [2020-09-21 11:31:09,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:31:09,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 11:31:09,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593907783] [2020-09-21 11:31:09,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 11:31:09,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:09,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 11:31:09,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-09-21 11:31:09,970 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-09-21 11:31:10,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:10,177 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-09-21 11:31:10,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 11:31:10,178 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-09-21 11:31:10,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:10,180 INFO L225 Difference]: With dead ends: 75 [2020-09-21 11:31:10,180 INFO L226 Difference]: Without dead ends: 55 [2020-09-21 11:31:10,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-09-21 11:31:10,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-09-21 11:31:10,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-09-21 11:31:10,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-09-21 11:31:10,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-09-21 11:31:10,202 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-09-21 11:31:10,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:10,202 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-09-21 11:31:10,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 11:31:10,203 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-09-21 11:31:10,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-21 11:31:10,207 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:10,208 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:10,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 11:31:10,208 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:10,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:10,210 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-09-21 11:31:10,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:10,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [291339018] [2020-09-21 11:31:10,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:10,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:10,459 FATAL L256 erpolLogProxyWrapper]: Difference in size: 1 [2020-09-21 11:31:10,459 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:10,460 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:10,460 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:10,460 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 38 [2020-09-21 11:31:10,460 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:10,460 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 201 [2020-09-21 11:31:10,461 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:10,461 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 14 [2020-09-21 11:31:10,461 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-09-21 11:31:10,461 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-09-21 11:31:10,461 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:11,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:11,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:11,060 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:11,060 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:11,060 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:11,060 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:11,061 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-09-21 11:31:11,063 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:11,063 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:31:11,063 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:11,064 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:11,064 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:11,064 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:11,064 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:11,072 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:11,073 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [291339018] [2020-09-21 11:31:11,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:31:11,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-21 11:31:11,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732318945] [2020-09-21 11:31:11,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-21 11:31:11,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:11,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-21 11:31:11,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=205, Unknown=0, NotChecked=0, Total=240 [2020-09-21 11:31:11,075 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 16 states. [2020-09-21 11:31:12,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:12,609 INFO L93 Difference]: Finished difference Result 98 states and 109 transitions. [2020-09-21 11:31:12,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-09-21 11:31:12,609 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 29 [2020-09-21 11:31:12,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:12,612 INFO L225 Difference]: With dead ends: 98 [2020-09-21 11:31:12,612 INFO L226 Difference]: Without dead ends: 96 [2020-09-21 11:31:12,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=212, Invalid=910, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 11:31:12,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-09-21 11:31:12,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 52. [2020-09-21 11:31:12,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-09-21 11:31:12,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-09-21 11:31:12,624 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-09-21 11:31:12,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:12,624 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-09-21 11:31:12,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-21 11:31:12,625 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-09-21 11:31:12,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-21 11:31:12,625 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:12,626 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:12,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 11:31:12,626 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:12,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:12,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-09-21 11:31:12,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:12,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585454719] [2020-09-21 11:31:12,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:12,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:12,671 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:12,672 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:12,672 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:12,672 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:12,672 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-09-21 11:31:12,672 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:12,673 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 30 [2020-09-21 11:31:12,673 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:12,673 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-09-21 11:31:12,673 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-09-21 11:31:12,673 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 18 [2020-09-21 11:31:12,674 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:31:12,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:31:12,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:31:12,751 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:31:12,751 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:31:12,752 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:31:12,752 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:31:12,752 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-09-21 11:31:12,752 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:31:12,753 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 11:31:12,753 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:31:12,753 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:31:12,753 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:31:12,754 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:31:12,754 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:31:12,758 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:31:12,758 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585454719] [2020-09-21 11:31:12,759 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:31:12,759 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 11:31:12,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173622731] [2020-09-21 11:31:12,760 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 11:31:12,760 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:31:12,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 11:31:12,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-09-21 11:31:12,761 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-09-21 11:31:13,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:31:13,027 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-09-21 11:31:13,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-21 11:31:13,028 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-09-21 11:31:13,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:31:13,029 INFO L225 Difference]: With dead ends: 88 [2020-09-21 11:31:13,029 INFO L226 Difference]: Without dead ends: 77 [2020-09-21 11:31:13,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-09-21 11:31:13,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-09-21 11:31:13,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-09-21 11:31:13,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-09-21 11:31:13,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-09-21 11:31:13,040 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-09-21 11:31:13,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:31:13,041 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-09-21 11:31:13,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 11:31:13,041 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-09-21 11:31:13,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-21 11:31:13,042 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:31:13,042 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:31:13,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 11:31:13,043 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:31:13,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:31:13,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-09-21 11:31:13,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:31:13,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914918011] [2020-09-21 11:31:13,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:31:13,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-21 11:31:13,066 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-21 11:31:13,067 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-21 11:31:13,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 11:31:13,094 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.09 11:31:13 BoogieIcfgContainer [2020-09-21 11:31:13,094 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-21 11:31:13,097 INFO L168 Benchmark]: Toolchain (without parser) took 9439.48 ms. Allocated memory was 140.0 MB in the beginning and 305.1 MB in the end (delta: 165.2 MB). Free memory was 103.2 MB in the beginning and 251.4 MB in the end (delta: -148.2 MB). Peak memory consumption was 16.9 MB. Max. memory is 7.1 GB. [2020-09-21 11:31:13,097 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-21 11:31:13,098 INFO L168 Benchmark]: CACSL2BoogieTranslator took 326.52 ms. Allocated memory is still 140.0 MB. Free memory was 102.5 MB in the beginning and 92.2 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-09-21 11:31:13,099 INFO L168 Benchmark]: Boogie Preprocessor took 143.68 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 92.2 MB in the beginning and 180.8 MB in the end (delta: -88.6 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2020-09-21 11:31:13,100 INFO L168 Benchmark]: RCFGBuilder took 382.79 ms. Allocated memory is still 202.9 MB. Free memory was 180.8 MB in the beginning and 163.7 MB in the end (delta: 17.1 MB). Peak memory consumption was 17.1 MB. Max. memory is 7.1 GB. [2020-09-21 11:31:13,101 INFO L168 Benchmark]: TraceAbstraction took 8575.78 ms. Allocated memory was 202.9 MB in the beginning and 305.1 MB in the end (delta: 102.2 MB). Free memory was 163.7 MB in the beginning and 251.4 MB in the end (delta: -87.6 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. [2020-09-21 11:31:13,104 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 326.52 ms. Allocated memory is still 140.0 MB. Free memory was 102.5 MB in the beginning and 92.2 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 143.68 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 92.2 MB in the beginning and 180.8 MB in the end (delta: -88.6 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 382.79 ms. Allocated memory is still 202.9 MB. Free memory was 180.8 MB in the beginning and 163.7 MB in the end (delta: 17.1 MB). Peak memory consumption was 17.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8575.78 ms. Allocated memory was 202.9 MB in the beginning and 305.1 MB in the end (delta: 102.2 MB). Free memory was 163.7 MB in the beginning and 251.4 MB in the end (delta: -87.6 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L15] COND FALSE !(!(MAX > 0)) [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i