/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.1 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 03:10:33,177 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 03:10:33,181 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 03:10:33,222 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 03:10:33,223 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 03:10:33,234 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 03:10:33,235 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 03:10:33,239 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 03:10:33,242 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 03:10:33,245 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 03:10:33,246 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 03:10:33,247 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 03:10:33,247 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 03:10:33,250 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 03:10:33,253 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 03:10:33,255 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 03:10:33,257 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 03:10:33,258 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 03:10:33,259 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 03:10:33,268 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 03:10:33,270 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 03:10:33,271 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 03:10:33,272 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 03:10:33,273 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 03:10:33,286 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 03:10:33,304 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 03:10:33,304 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 03:10:33,305 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 03:10:33,309 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 03:10:33,346 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 03:10:33,346 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 03:10:33,347 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 03:10:33,347 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 03:10:33,347 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 03:10:33,348 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 03:10:33,348 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 03:10:33,348 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 03:10:33,348 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 03:10:33,348 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 03:10:33,349 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 03:10:33,349 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 03:10:33,349 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 03:10:33,349 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 03:10:33,349 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 03:10:33,350 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 03:10:33,350 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 03:10:33,350 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 03:10:33,350 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 03:10:33,350 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 03:10:33,351 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 03:10:33,351 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 03:10:33,351 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 03:10:33,351 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 03:10:33,351 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 03:10:33,352 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 03:10:33,352 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 03:10:33,352 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 03:10:33,352 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 03:10:33,352 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; [2020-08-22 03:10:33,674 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 03:10:33,697 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 03:10:33,705 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 03:10:33,707 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 03:10:33,707 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 03:10:33,708 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-22 03:10:33,787 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c5774156b/cb85ca9e36ee49108adc5a58ff45e9a9/FLAGa22fba0ad [2020-08-22 03:10:34,283 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 03:10:34,284 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-22 03:10:34,292 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c5774156b/cb85ca9e36ee49108adc5a58ff45e9a9/FLAGa22fba0ad [2020-08-22 03:10:34,620 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c5774156b/cb85ca9e36ee49108adc5a58ff45e9a9 [2020-08-22 03:10:34,632 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 03:10:34,634 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 03:10:34,637 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 03:10:34,637 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 03:10:34,641 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 03:10:34,642 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:10:34" (1/1) ... [2020-08-22 03:10:34,646 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57c4c539 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:34, skipping insertion in model container [2020-08-22 03:10:34,647 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:10:34" (1/1) ... [2020-08-22 03:10:34,656 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 03:10:34,680 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 03:10:34,852 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:10:34,857 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 03:10:34,876 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:10:34,891 INFO L208 MainTranslator]: Completed translation [2020-08-22 03:10:34,892 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:34 WrapperNode [2020-08-22 03:10:34,892 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 03:10:34,893 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 03:10:34,893 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 03:10:34,893 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 03:10:34,907 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:34" (1/1) ... [2020-08-22 03:10:34,908 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:34" (1/1) ... [2020-08-22 03:10:34,913 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:34" (1/1) ... [2020-08-22 03:10:34,914 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:34" (1/1) ... [2020-08-22 03:10:34,996 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:34" (1/1) ... [2020-08-22 03:10:35,006 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:34" (1/1) ... [2020-08-22 03:10:35,007 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:34" (1/1) ... [2020-08-22 03:10:35,009 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 03:10:35,010 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 03:10:35,010 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 03:10:35,010 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 03:10:35,011 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:34" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 03:10:35,065 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 03:10:35,065 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 03:10:35,066 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 03:10:35,066 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 03:10:35,066 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 03:10:35,066 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 03:10:35,066 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 03:10:35,066 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 03:10:35,066 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 03:10:35,067 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 03:10:35,067 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 03:10:35,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 03:10:35,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 03:10:35,316 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 03:10:35,316 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 03:10:35,321 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:10:35 BoogieIcfgContainer [2020-08-22 03:10:35,322 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 03:10:35,335 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 03:10:35,335 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 03:10:35,339 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 03:10:35,339 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 03:10:34" (1/3) ... [2020-08-22 03:10:35,347 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14a4d9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:10:35, skipping insertion in model container [2020-08-22 03:10:35,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:10:34" (2/3) ... [2020-08-22 03:10:35,348 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14a4d9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:10:35, skipping insertion in model container [2020-08-22 03:10:35,348 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:10:35" (3/3) ... [2020-08-22 03:10:35,350 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-22 03:10:35,378 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 03:10:35,396 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 03:10:35,415 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 03:10:35,441 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 03:10:35,441 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 03:10:35,441 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 03:10:35,441 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 03:10:35,441 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 03:10:35,441 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 03:10:35,442 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 03:10:35,442 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 03:10:35,458 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-22 03:10:35,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 03:10:35,465 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:35,466 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:35,466 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:35,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:35,473 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-22 03:10:35,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:35,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1261366520] [2020-08-22 03:10:35,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:35,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:35,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:35,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:35,593 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:35,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1261366520] [2020-08-22 03:10:35,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:10:35,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-22 03:10:35,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144407543] [2020-08-22 03:10:35,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-22 03:10:35,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:35,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-22 03:10:35,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 03:10:35,619 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-22 03:10:35,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:35,645 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-22 03:10:35,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-22 03:10:35,647 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-22 03:10:35,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:35,658 INFO L225 Difference]: With dead ends: 35 [2020-08-22 03:10:35,658 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 03:10:35,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 03:10:35,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 03:10:35,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 03:10:35,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 03:10:35,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-22 03:10:35,714 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-22 03:10:35,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:35,714 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-22 03:10:35,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-22 03:10:35,715 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-22 03:10:35,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 03:10:35,716 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:35,716 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:35,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 03:10:35,717 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:35,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:35,718 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-22 03:10:35,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:35,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290430414] [2020-08-22 03:10:35,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:35,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:35,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:35,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:35,775 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:35,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290430414] [2020-08-22 03:10:35,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:10:35,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 03:10:35,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113974378] [2020-08-22 03:10:35,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 03:10:35,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:35,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 03:10:35,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 03:10:35,780 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-22 03:10:35,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:35,795 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-22 03:10:35,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 03:10:35,796 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-22 03:10:35,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:35,797 INFO L225 Difference]: With dead ends: 24 [2020-08-22 03:10:35,797 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 03:10:35,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 03:10:35,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 03:10:35,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 03:10:35,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 03:10:35,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-22 03:10:35,803 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-22 03:10:35,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:35,803 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-22 03:10:35,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 03:10:35,804 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-22 03:10:35,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 03:10:35,805 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:35,805 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:35,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 03:10:35,805 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:35,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:35,806 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-22 03:10:35,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:35,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234545952] [2020-08-22 03:10:35,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:35,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:36,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:36,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:36,109 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:36,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234545952] [2020-08-22 03:10:36,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:10:36,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 03:10:36,111 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669594146] [2020-08-22 03:10:36,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 03:10:36,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:36,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 03:10:36,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 03:10:36,115 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-22 03:10:36,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:36,171 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-22 03:10:36,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 03:10:36,172 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-22 03:10:36,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:36,174 INFO L225 Difference]: With dead ends: 23 [2020-08-22 03:10:36,174 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 03:10:36,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 03:10:36,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 03:10:36,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 03:10:36,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 03:10:36,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-22 03:10:36,183 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-22 03:10:36,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:36,184 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-22 03:10:36,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 03:10:36,184 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-22 03:10:36,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 03:10:36,185 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:36,186 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:36,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 03:10:36,186 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:36,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:36,187 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-22 03:10:36,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:36,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738337354] [2020-08-22 03:10:36,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:36,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:36,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:36,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:36,406 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:36,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738337354] [2020-08-22 03:10:36,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:10:36,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 03:10:36,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718736531] [2020-08-22 03:10:36,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 03:10:36,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:36,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 03:10:36,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 03:10:36,408 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-22 03:10:36,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:36,430 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-22 03:10:36,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 03:10:36,430 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-22 03:10:36,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:36,431 INFO L225 Difference]: With dead ends: 26 [2020-08-22 03:10:36,432 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 03:10:36,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 03:10:36,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 03:10:36,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 03:10:36,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 03:10:36,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 03:10:36,437 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-22 03:10:36,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:36,437 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 03:10:36,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 03:10:36,438 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 03:10:36,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 03:10:36,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:36,439 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:36,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 03:10:36,439 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:36,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:36,440 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-22 03:10:36,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:36,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1897368878] [2020-08-22 03:10:36,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:36,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:36,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:36,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:36,646 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:36,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1897368878] [2020-08-22 03:10:36,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:36,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 03:10:36,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920965982] [2020-08-22 03:10:36,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 03:10:36,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:36,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 03:10:36,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-22 03:10:36,662 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-22 03:10:36,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:36,751 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-22 03:10:36,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 03:10:36,752 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-22 03:10:36,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:36,753 INFO L225 Difference]: With dead ends: 26 [2020-08-22 03:10:36,753 INFO L226 Difference]: Without dead ends: 20 [2020-08-22 03:10:36,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-22 03:10:36,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-22 03:10:36,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-22 03:10:36,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 03:10:36,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-22 03:10:36,759 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-22 03:10:36,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:36,759 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-22 03:10:36,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 03:10:36,759 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-22 03:10:36,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 03:10:36,760 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:36,760 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:36,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 03:10:36,761 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:36,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:36,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-22 03:10:36,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:36,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2138473385] [2020-08-22 03:10:36,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:36,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:37,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:37,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:37,012 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:37,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2138473385] [2020-08-22 03:10:37,013 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:37,013 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 03:10:37,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755935266] [2020-08-22 03:10:37,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 03:10:37,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:37,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 03:10:37,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-22 03:10:37,017 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-22 03:10:37,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:37,156 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-22 03:10:37,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 03:10:37,156 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-22 03:10:37,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:37,157 INFO L225 Difference]: With dead ends: 29 [2020-08-22 03:10:37,158 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 03:10:37,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-22 03:10:37,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 03:10:37,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-22 03:10:37,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-22 03:10:37,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-22 03:10:37,171 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-22 03:10:37,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:37,171 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-22 03:10:37,171 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 03:10:37,171 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-22 03:10:37,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 03:10:37,172 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:37,172 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:37,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 03:10:37,178 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:37,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:37,178 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-22 03:10:37,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:37,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1640535402] [2020-08-22 03:10:37,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:37,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:37,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:37,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:37,506 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:37,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1640535402] [2020-08-22 03:10:37,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:37,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 03:10:37,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270552330] [2020-08-22 03:10:37,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 03:10:37,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:37,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 03:10:37,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-22 03:10:37,512 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-22 03:10:41,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:41,965 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-22 03:10:41,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 03:10:41,965 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-22 03:10:41,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:41,966 INFO L225 Difference]: With dead ends: 32 [2020-08-22 03:10:41,967 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 03:10:41,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=33, Invalid=148, Unknown=1, NotChecked=0, Total=182 [2020-08-22 03:10:41,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 03:10:41,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-22 03:10:41,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 03:10:41,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-22 03:10:41,972 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-22 03:10:41,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:41,973 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-22 03:10:41,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 03:10:41,973 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-22 03:10:41,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 03:10:41,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:41,974 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:41,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 03:10:41,975 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:41,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:41,975 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-22 03:10:41,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:41,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [608522145] [2020-08-22 03:10:41,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:41,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:42,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:42,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:42,292 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:42,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [608522145] [2020-08-22 03:10:42,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:42,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 03:10:42,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178714108] [2020-08-22 03:10:42,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 03:10:42,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:42,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 03:10:42,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-22 03:10:42,295 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-22 03:10:42,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:42,506 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-22 03:10:42,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 03:10:42,506 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-22 03:10:42,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:42,507 INFO L225 Difference]: With dead ends: 35 [2020-08-22 03:10:42,508 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 03:10:42,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-22 03:10:42,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 03:10:42,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-22 03:10:42,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 03:10:42,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-22 03:10:42,513 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-22 03:10:42,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:42,514 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-22 03:10:42,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 03:10:42,514 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-22 03:10:42,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 03:10:42,515 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:42,515 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:42,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 03:10:42,516 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:42,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:42,516 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-22 03:10:42,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:42,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1429017626] [2020-08-22 03:10:42,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:42,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:42,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:42,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:42,909 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:42,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1429017626] [2020-08-22 03:10:42,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:42,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 03:10:42,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283454041] [2020-08-22 03:10:42,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 03:10:42,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:42,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 03:10:42,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-22 03:10:42,912 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-22 03:10:49,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:49,448 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-22 03:10:49,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 03:10:49,449 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-22 03:10:49,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:49,449 INFO L225 Difference]: With dead ends: 38 [2020-08-22 03:10:49,450 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 03:10:49,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-08-22 03:10:49,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 03:10:49,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-22 03:10:49,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 03:10:49,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-22 03:10:49,455 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-22 03:10:49,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:49,455 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-22 03:10:49,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 03:10:49,455 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-22 03:10:49,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 03:10:49,456 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:49,457 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:49,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 03:10:49,457 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:49,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:49,457 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-22 03:10:49,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:49,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [644440006] [2020-08-22 03:10:49,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:49,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:49,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:49,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:49,895 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:49,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [644440006] [2020-08-22 03:10:49,896 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:49,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 03:10:49,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142125487] [2020-08-22 03:10:49,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 03:10:49,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:49,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 03:10:49,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-22 03:10:49,898 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-22 03:10:52,023 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 22 [2020-08-22 03:10:58,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:58,533 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-22 03:10:58,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 03:10:58,537 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-22 03:10:58,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:58,537 INFO L225 Difference]: With dead ends: 41 [2020-08-22 03:10:58,538 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 03:10:58,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-22 03:10:58,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 03:10:58,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-22 03:10:58,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 03:10:58,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-22 03:10:58,545 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-22 03:10:58,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:58,546 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-22 03:10:58,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 03:10:58,546 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-22 03:10:58,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 03:10:58,547 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:58,547 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:10:58,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 03:10:58,547 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:58,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:58,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-22 03:10:58,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:58,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [832525777] [2020-08-22 03:10:58,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:58,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:59,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:59,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:59,083 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:10:59,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [832525777] [2020-08-22 03:10:59,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:59,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 03:10:59,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944118279] [2020-08-22 03:10:59,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 03:10:59,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:59,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 03:10:59,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-22 03:10:59,086 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-22 03:11:16,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:11:16,078 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-22 03:11:16,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 03:11:16,078 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-22 03:11:16,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:11:16,079 INFO L225 Difference]: With dead ends: 44 [2020-08-22 03:11:16,079 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 03:11:16,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=49, Invalid=410, Unknown=3, NotChecked=0, Total=462 [2020-08-22 03:11:16,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 03:11:16,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-22 03:11:16,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 03:11:16,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-22 03:11:16,091 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-22 03:11:16,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:11:16,091 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-22 03:11:16,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 03:11:16,091 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-22 03:11:16,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 03:11:16,094 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:11:16,095 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:11:16,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 03:11:16,095 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:11:16,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:11:16,095 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-22 03:11:16,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:11:16,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [637512547] [2020-08-22 03:11:16,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:11:16,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:11:16,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:11:16,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:11:16,707 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:11:16,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [637512547] [2020-08-22 03:11:16,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:11:16,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 03:11:16,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418590937] [2020-08-22 03:11:16,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 03:11:16,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:11:16,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 03:11:16,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-22 03:11:16,709 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-22 03:11:17,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:11:17,161 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-22 03:11:17,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 03:11:17,162 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-22 03:11:17,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:11:17,163 INFO L225 Difference]: With dead ends: 47 [2020-08-22 03:11:17,163 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 03:11:17,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-22 03:11:17,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 03:11:17,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-22 03:11:17,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 03:11:17,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-22 03:11:17,168 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-22 03:11:17,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:11:17,169 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-22 03:11:17,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 03:11:17,169 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-22 03:11:17,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 03:11:17,170 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:11:17,170 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:11:17,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 03:11:17,170 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:11:17,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:11:17,171 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-22 03:11:17,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:11:17,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [191193980] [2020-08-22 03:11:17,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:11:17,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:11:17,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:11:17,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:11:17,895 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:11:17,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [191193980] [2020-08-22 03:11:17,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:11:17,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 03:11:17,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014458454] [2020-08-22 03:11:17,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 03:11:17,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:11:17,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 03:11:17,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-22 03:11:17,898 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-22 03:11:37,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:11:37,289 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-22 03:11:37,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 03:11:37,290 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-22 03:11:37,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:11:37,291 INFO L225 Difference]: With dead ends: 50 [2020-08-22 03:11:37,291 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 03:11:37,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=57, Invalid=589, Unknown=4, NotChecked=0, Total=650 [2020-08-22 03:11:37,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 03:11:37,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-22 03:11:37,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 03:11:37,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-22 03:11:37,297 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-22 03:11:37,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:11:37,297 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-22 03:11:37,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 03:11:37,297 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-22 03:11:37,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 03:11:37,298 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:11:37,298 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 03:11:37,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 03:11:37,299 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:11:37,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:11:37,299 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-22 03:11:37,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:11:37,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [803794852] [2020-08-22 03:11:37,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:11:37,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:11:38,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:11:38,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:11:38,161 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:11:38,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [803794852] [2020-08-22 03:11:38,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:11:38,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 03:11:38,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996551572] [2020-08-22 03:11:38,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 03:11:38,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:11:38,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 03:11:38,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-22 03:11:38,163 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states.