/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=1000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 16:33:09,178 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 16:33:09,180 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 16:33:09,203 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 16:33:09,204 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 16:33:09,205 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 16:33:09,206 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 16:33:09,211 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 16:33:09,213 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 16:33:09,214 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 16:33:09,218 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 16:33:09,219 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 16:33:09,219 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 16:33:09,220 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 16:33:09,223 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 16:33:09,225 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 16:33:09,226 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 16:33:09,227 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 16:33:09,230 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 16:33:09,232 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 16:33:09,234 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 16:33:09,237 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 16:33:09,239 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 16:33:09,240 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 16:33:09,245 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 16:33:09,268 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 16:33:09,268 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 16:33:09,271 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 16:33:09,272 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 16:33:09,314 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 16:33:09,314 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 16:33:09,315 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 16:33:09,315 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 16:33:09,315 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 16:33:09,316 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 16:33:09,316 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 16:33:09,316 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 16:33:09,316 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 16:33:09,316 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 16:33:09,317 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 16:33:09,317 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 16:33:09,317 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 16:33:09,318 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 16:33:09,318 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 16:33:09,318 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 16:33:09,318 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 16:33:09,319 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 16:33:09,319 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 16:33:09,319 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 16:33:09,319 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 16:33:09,319 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 16:33:09,320 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 16:33:09,320 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 16:33:09,320 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 16:33:09,320 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 16:33:09,320 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 16:33:09,320 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 16:33:09,321 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 16:33:09,321 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=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 16:33:09,631 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 16:33:09,644 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 16:33:09,652 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 16:33:09,654 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 16:33:09,655 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 16:33:09,656 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-21 16:33:09,713 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/666faf2ca/5e2e0e77e71944bf81b808ac5f851914/FLAGa5d662819 [2020-08-21 16:33:10,186 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 16:33:10,186 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-21 16:33:10,193 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/666faf2ca/5e2e0e77e71944bf81b808ac5f851914/FLAGa5d662819 [2020-08-21 16:33:10,573 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/666faf2ca/5e2e0e77e71944bf81b808ac5f851914 [2020-08-21 16:33:10,581 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 16:33:10,583 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 16:33:10,584 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 16:33:10,584 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 16:33:10,587 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 16:33:10,588 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,591 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7b337bef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10, skipping insertion in model container [2020-08-21 16:33:10,591 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,598 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 16:33:10,615 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 16:33:10,796 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 16:33:10,804 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 16:33:10,826 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 16:33:10,916 INFO L208 MainTranslator]: Completed translation [2020-08-21 16:33:10,917 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10 WrapperNode [2020-08-21 16:33:10,917 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 16:33:10,918 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 16:33:10,918 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 16:33:10,918 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 16:33:10,928 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,928 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,948 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,948 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,970 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,976 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,977 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... [2020-08-21 16:33:10,980 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 16:33:10,981 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 16:33:10,981 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 16:33:10,981 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 16:33:10,982 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 16:33:11,040 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 16:33:11,040 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 16:33:11,040 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 16:33:11,041 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 16:33:11,041 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 16:33:11,041 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 16:33:11,041 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 16:33:11,041 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 16:33:11,041 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 16:33:11,041 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 16:33:11,042 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 16:33:11,042 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 16:33:11,042 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 16:33:11,042 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 16:33:11,042 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 16:33:11,043 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 16:33:11,356 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 16:33:11,356 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 16:33:11,360 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 04:33:11 BoogieIcfgContainer [2020-08-21 16:33:11,360 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 16:33:11,362 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 16:33:11,362 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 16:33:11,365 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 16:33:11,365 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 04:33:10" (1/3) ... [2020-08-21 16:33:11,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@512958be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 04:33:11, skipping insertion in model container [2020-08-21 16:33:11,366 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:33:10" (2/3) ... [2020-08-21 16:33:11,367 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@512958be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 04:33:11, skipping insertion in model container [2020-08-21 16:33:11,367 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 04:33:11" (3/3) ... [2020-08-21 16:33:11,369 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-21 16:33:11,380 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 16:33:11,388 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 16:33:11,403 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 16:33:11,429 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 16:33:11,430 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 16:33:11,430 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 16:33:11,430 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 16:33:11,430 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 16:33:11,430 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 16:33:11,431 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 16:33:11,431 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 16:33:11,449 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 16:33:11,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 16:33:11,456 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:11,457 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:33:11,457 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:11,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:11,467 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-21 16:33:11,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:11,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48997529] [2020-08-21 16:33:11,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:11,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:11,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 16:33:11,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:11,679 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:33:11,685 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48997529] [2020-08-21 16:33:11,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 16:33:11,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 16:33:11,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131076375] [2020-08-21 16:33:11,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 16:33:11,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:11,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 16:33:11,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 16:33:11,708 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 16:33:11,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:11,847 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-21 16:33:11,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 16:33:11,849 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 16:33:11,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:11,868 INFO L225 Difference]: With dead ends: 42 [2020-08-21 16:33:11,870 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 16:33:11,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 16:33:11,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 16:33:11,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 16:33:11,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 16:33:11,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 16:33:11,939 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-21 16:33:11,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:11,941 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 16:33:11,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 16:33:11,941 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 16:33:11,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 16:33:11,943 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:11,943 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:33:11,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 16:33:11,944 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:11,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:11,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-21 16:33:11,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:11,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133139308] [2020-08-21 16:33:11,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:12,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:12,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 16:33:12,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,108 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:33:12,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133139308] [2020-08-21 16:33:12,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 16:33:12,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 16:33:12,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783042297] [2020-08-21 16:33:12,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 16:33:12,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:12,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 16:33:12,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 16:33:12,113 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-21 16:33:12,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:12,178 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-21 16:33:12,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 16:33:12,179 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-21 16:33:12,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:12,180 INFO L225 Difference]: With dead ends: 34 [2020-08-21 16:33:12,180 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 16:33:12,182 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 16:33:12,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 16:33:12,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 16:33:12,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 16:33:12,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 16:33:12,189 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-21 16:33:12,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:12,190 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 16:33:12,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 16:33:12,190 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 16:33:12,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 16:33:12,191 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:12,191 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:33:12,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 16:33:12,192 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:12,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:12,193 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-21 16:33:12,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:12,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1897773243] [2020-08-21 16:33:12,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:12,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:12,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-21 16:33:12,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,305 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:33:12,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1897773243] [2020-08-21 16:33:12,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:12,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 16:33:12,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143016489] [2020-08-21 16:33:12,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 16:33:12,307 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:12,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 16:33:12,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 16:33:12,308 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-21 16:33:12,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:12,383 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-21 16:33:12,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 16:33:12,383 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-21 16:33:12,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:12,385 INFO L225 Difference]: With dead ends: 36 [2020-08-21 16:33:12,385 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 16:33:12,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 16:33:12,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 16:33:12,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 16:33:12,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 16:33:12,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 16:33:12,393 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-21 16:33:12,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:12,393 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 16:33:12,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 16:33:12,394 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 16:33:12,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 16:33:12,395 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:12,395 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] [2020-08-21 16:33:12,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 16:33:12,396 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:12,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:12,396 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-21 16:33:12,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:12,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314374857] [2020-08-21 16:33:12,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:12,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:12,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-21 16:33:12,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,545 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:33:12,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314374857] [2020-08-21 16:33:12,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:12,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 16:33:12,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780410364] [2020-08-21 16:33:12,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 16:33:12,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:12,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 16:33:12,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 16:33:12,551 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-21 16:33:12,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:12,667 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-21 16:33:12,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 16:33:12,668 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 16:33:12,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:12,669 INFO L225 Difference]: With dead ends: 38 [2020-08-21 16:33:12,669 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 16:33:12,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 16:33:12,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 16:33:12,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 16:33:12,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 16:33:12,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-21 16:33:12,676 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-21 16:33:12,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:12,677 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-21 16:33:12,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 16:33:12,677 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-21 16:33:12,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 16:33:12,678 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:12,678 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:33:12,678 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 16:33:12,678 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:12,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:12,679 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-21 16:33:12,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:12,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [524282925] [2020-08-21 16:33:12,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:12,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:12,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 16:33:12,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,771 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:33:12,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [524282925] [2020-08-21 16:33:12,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:12,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 16:33:12,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950823250] [2020-08-21 16:33:12,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 16:33:12,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:12,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 16:33:12,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 16:33:12,773 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-21 16:33:12,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:12,847 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-21 16:33:12,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 16:33:12,848 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-21 16:33:12,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:12,849 INFO L225 Difference]: With dead ends: 40 [2020-08-21 16:33:12,849 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 16:33:12,850 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 16:33:12,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 16:33:12,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 16:33:12,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 16:33:12,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 16:33:12,856 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-21 16:33:12,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:12,856 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 16:33:12,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 16:33:12,856 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 16:33:12,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 16:33:12,857 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:12,857 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:33:12,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 16:33:12,858 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:12,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:12,858 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-21 16:33:12,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:12,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407788211] [2020-08-21 16:33:12,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:12,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:12,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:12,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 16:33:13,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,005 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:33:13,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407788211] [2020-08-21 16:33:13,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:13,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 16:33:13,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540620783] [2020-08-21 16:33:13,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 16:33:13,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:13,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 16:33:13,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 16:33:13,011 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-21 16:33:13,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:13,115 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-21 16:33:13,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 16:33:13,116 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 16:33:13,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:13,117 INFO L225 Difference]: With dead ends: 42 [2020-08-21 16:33:13,117 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 16:33:13,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 16:33:13,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 16:33:13,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 16:33:13,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 16:33:13,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-21 16:33:13,128 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-21 16:33:13,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:13,128 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-21 16:33:13,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 16:33:13,129 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-21 16:33:13,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 16:33:13,130 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:13,131 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:33:13,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 16:33:13,131 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:13,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:13,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-21 16:33:13,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:13,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1655884392] [2020-08-21 16:33:13,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:13,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:13,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 16:33:13,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,278 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:33:13,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1655884392] [2020-08-21 16:33:13,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:13,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 16:33:13,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048332660] [2020-08-21 16:33:13,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 16:33:13,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:13,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 16:33:13,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 16:33:13,281 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-21 16:33:13,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:13,380 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-21 16:33:13,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 16:33:13,380 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 16:33:13,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:13,381 INFO L225 Difference]: With dead ends: 44 [2020-08-21 16:33:13,382 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 16:33:13,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 16:33:13,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 16:33:13,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 16:33:13,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 16:33:13,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-21 16:33:13,388 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-21 16:33:13,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:13,389 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-21 16:33:13,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 16:33:13,389 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-21 16:33:13,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 16:33:13,390 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:13,390 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:33:13,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 16:33:13,391 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:13,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:13,391 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-21 16:33:13,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:13,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388815103] [2020-08-21 16:33:13,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:13,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:13,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 16:33:13,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,512 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:33:13,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1388815103] [2020-08-21 16:33:13,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:13,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 16:33:13,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709627199] [2020-08-21 16:33:13,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 16:33:13,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:13,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 16:33:13,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 16:33:13,515 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-21 16:33:13,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:13,604 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-21 16:33:13,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 16:33:13,605 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 16:33:13,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:13,606 INFO L225 Difference]: With dead ends: 46 [2020-08-21 16:33:13,606 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 16:33:13,607 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 16:33:13,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 16:33:13,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 16:33:13,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 16:33:13,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 16:33:13,613 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-21 16:33:13,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:13,614 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 16:33:13,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 16:33:13,614 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 16:33:13,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 16:33:13,615 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:13,615 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:33:13,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 16:33:13,616 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:13,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:13,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-21 16:33:13,617 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:13,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189285708] [2020-08-21 16:33:13,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:13,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:13,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 16:33:13,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:13,763 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:33:13,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189285708] [2020-08-21 16:33:13,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:13,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 16:33:13,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772746966] [2020-08-21 16:33:13,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 16:33:13,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:13,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 16:33:13,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 16:33:13,774 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 16:33:13,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:13,889 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 16:33:13,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 16:33:13,890 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 16:33:13,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:13,891 INFO L225 Difference]: With dead ends: 48 [2020-08-21 16:33:13,891 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 16:33:13,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 16:33:13,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 16:33:13,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 16:33:13,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 16:33:13,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-21 16:33:13,900 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-21 16:33:13,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:13,901 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-21 16:33:13,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 16:33:13,901 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-21 16:33:13,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 16:33:13,902 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:13,902 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:33:13,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 16:33:13,903 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:13,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:13,903 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-21 16:33:13,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:13,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1413309747] [2020-08-21 16:33:13,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:13,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:14,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 16:33:14,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,064 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:33:14,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1413309747] [2020-08-21 16:33:14,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:14,065 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 16:33:14,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218159920] [2020-08-21 16:33:14,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 16:33:14,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:14,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 16:33:14,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 16:33:14,067 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-21 16:33:14,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:14,172 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-21 16:33:14,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 16:33:14,172 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 16:33:14,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:14,173 INFO L225 Difference]: With dead ends: 50 [2020-08-21 16:33:14,173 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 16:33:14,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 16:33:14,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 16:33:14,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 16:33:14,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 16:33:14,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-21 16:33:14,179 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-21 16:33:14,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:14,179 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-21 16:33:14,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 16:33:14,180 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-21 16:33:14,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 16:33:14,181 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:14,181 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:33:14,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 16:33:14,181 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:14,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:14,182 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-21 16:33:14,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:14,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504345625] [2020-08-21 16:33:14,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:14,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:14,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 16:33:14,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:14,320 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:33:14,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504345625] [2020-08-21 16:33:14,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:14,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 16:33:14,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881757733] [2020-08-21 16:33:14,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 16:33:14,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:14,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 16:33:14,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 16:33:14,323 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-21 16:33:14,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:14,425 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-21 16:33:14,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 16:33:14,425 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 16:33:14,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:14,426 INFO L225 Difference]: With dead ends: 51 [2020-08-21 16:33:14,427 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 16:33:14,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 16:33:14,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 16:33:14,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 16:33:14,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 16:33:14,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 16:33:14,436 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-21 16:33:14,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:14,437 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 16:33:14,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 16:33:14,437 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 16:33:14,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 16:33:14,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:14,438 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:33:14,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 16:33:14,438 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:14,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:14,439 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-21 16:33:14,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:14,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1186958098] [2020-08-21 16:33:14,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:14,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:24,293 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-21 16:33:25,307 WARN L193 SmtUtils]: Spent 823.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-21 16:33:29,464 WARN L193 SmtUtils]: Spent 3.73 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-21 16:33:57,554 WARN L193 SmtUtils]: Spent 27.18 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-21 16:33:57,876 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 31 [2020-08-21 16:33:57,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:33:57,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:57,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 16:33:57,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:33:57,988 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 16:33:57,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1186958098] [2020-08-21 16:33:57,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:33:57,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 16:33:57,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395036805] [2020-08-21 16:33:57,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 16:33:57,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:33:57,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 16:33:57,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-21 16:33:57,993 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-21 16:33:58,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:33:58,432 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 16:33:58,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 16:33:58,433 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-21 16:33:58,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:33:58,434 INFO L225 Difference]: With dead ends: 49 [2020-08-21 16:33:58,435 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 16:33:58,436 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.4s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-21 16:33:58,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 16:33:58,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 16:33:58,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 16:33:58,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-21 16:33:58,451 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-21 16:33:58,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:33:58,451 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-21 16:33:58,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 16:33:58,453 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-21 16:33:58,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 16:33:58,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:33:58,454 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:33:58,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 16:33:58,457 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:33:58,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:33:58,457 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-21 16:33:58,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:33:58,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1493483925] [2020-08-21 16:33:58,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:33:58,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:34:02,579 WARN L193 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-21 16:34:03,602 WARN L193 SmtUtils]: Spent 812.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-21 16:34:07,650 WARN L193 SmtUtils]: Spent 3.66 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-21 16:34:07,853 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2020-08-21 16:34:08,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:34:08,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:34:08,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 16:34:08,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:34:08,292 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 16:34:08,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1493483925] [2020-08-21 16:34:08,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:34:08,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 16:34:08,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221261079] [2020-08-21 16:34:08,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 16:34:08,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:34:08,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 16:34:08,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-21 16:34:08,295 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-21 16:34:09,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:34:09,342 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 16:34:09,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 16:34:09,343 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-21 16:34:09,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:34:09,345 INFO L225 Difference]: With dead ends: 48 [2020-08-21 16:34:09,346 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 16:34:09,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-21 16:34:09,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 16:34:09,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 16:34:09,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 16:34:09,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-21 16:34:09,369 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-21 16:34:09,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:34:09,369 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-21 16:34:09,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 16:34:09,369 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-21 16:34:09,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 16:34:09,370 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:34:09,370 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:34:09,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 16:34:09,371 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:34:09,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:34:09,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-21 16:34:09,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:34:09,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2146491457] [2020-08-21 16:34:09,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:34:09,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat