/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-89f541c [2020-08-27 21:59:29,154 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-27 21:59:29,158 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-27 21:59:29,202 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-27 21:59:29,202 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-27 21:59:29,210 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-27 21:59:29,215 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-27 21:59:29,220 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-27 21:59:29,223 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-27 21:59:29,227 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-27 21:59:29,228 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-27 21:59:29,229 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-27 21:59:29,229 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-27 21:59:29,233 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-27 21:59:29,236 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-27 21:59:29,237 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-27 21:59:29,239 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-27 21:59:29,240 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-27 21:59:29,242 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-27 21:59:29,250 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-27 21:59:29,253 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-27 21:59:29,254 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-27 21:59:29,255 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-27 21:59:29,256 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-27 21:59:29,269 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-27 21:59:29,289 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-27 21:59:29,290 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-27 21:59:29,291 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-27 21:59:29,292 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 [2020-08-27 21:59:29,339 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-27 21:59:29,339 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-27 21:59:29,341 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-27 21:59:29,342 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-27 21:59:29,342 INFO L138 SettingsManager]: * Use SBE=true [2020-08-27 21:59:29,342 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-27 21:59:29,343 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-27 21:59:29,343 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-27 21:59:29,343 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-27 21:59:29,343 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-27 21:59:29,344 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-27 21:59:29,345 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-27 21:59:29,345 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-27 21:59:29,345 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-27 21:59:29,345 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-27 21:59:29,346 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-27 21:59:29,346 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-27 21:59:29,346 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-27 21:59:29,346 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-27 21:59:29,346 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-27 21:59:29,347 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-27 21:59:29,347 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-27 21:59:29,347 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-27 21:59:29,347 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-27 21:59:29,348 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-27 21:59:29,348 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-27 21:59:29,348 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-27 21:59:29,348 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-27 21:59:29,348 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-27 21:59:29,349 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 -> false [2020-08-27 21:59:29,821 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-27 21:59:29,845 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-27 21:59:29,850 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-27 21:59:29,852 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-27 21:59:29,852 INFO L275 PluginConnector]: CDTParser initialized [2020-08-27 21:59:29,853 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-27 21:59:29,936 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a7afc220e/b5cedcfc4b744fdfb48b704b3343a4a1/FLAGc5030cfde [2020-08-27 21:59:30,454 INFO L306 CDTParser]: Found 1 translation units. [2020-08-27 21:59:30,455 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-27 21:59:30,464 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a7afc220e/b5cedcfc4b744fdfb48b704b3343a4a1/FLAGc5030cfde [2020-08-27 21:59:30,785 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a7afc220e/b5cedcfc4b744fdfb48b704b3343a4a1 [2020-08-27 21:59:30,799 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-27 21:59:30,801 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-27 21:59:30,802 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-27 21:59:30,802 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-27 21:59:30,807 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-27 21:59:30,808 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 09:59:30" (1/1) ... [2020-08-27 21:59:30,813 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@528baabb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:30, skipping insertion in model container [2020-08-27 21:59:30,813 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 09:59:30" (1/1) ... [2020-08-27 21:59:30,822 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-27 21:59:30,849 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-27 21:59:31,075 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-27 21:59:31,081 INFO L203 MainTranslator]: Completed pre-run [2020-08-27 21:59:31,102 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-27 21:59:31,116 INFO L208 MainTranslator]: Completed translation [2020-08-27 21:59:31,117 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:31 WrapperNode [2020-08-27 21:59:31,117 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-27 21:59:31,118 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-27 21:59:31,118 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-27 21:59:31,118 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-27 21:59:31,131 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:31" (1/1) ... [2020-08-27 21:59:31,132 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:31" (1/1) ... [2020-08-27 21:59:31,137 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:31" (1/1) ... [2020-08-27 21:59:31,138 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:31" (1/1) ... [2020-08-27 21:59:31,220 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:31" (1/1) ... [2020-08-27 21:59:31,230 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:31" (1/1) ... [2020-08-27 21:59:31,231 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:31" (1/1) ... [2020-08-27 21:59:31,233 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-27 21:59:31,234 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-27 21:59:31,234 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-27 21:59:31,234 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-27 21:59:31,235 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:31" (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 [2020-08-27 21:59:31,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-27 21:59:31,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-27 21:59:31,320 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-27 21:59:31,320 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-27 21:59:31,321 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-27 21:59:31,322 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-27 21:59:31,322 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-27 21:59:31,322 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-27 21:59:31,322 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-27 21:59:31,323 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-27 21:59:31,323 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-27 21:59:31,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-27 21:59:31,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-27 21:59:31,567 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-27 21:59:31,567 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-27 21:59:31,572 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 09:59:31 BoogieIcfgContainer [2020-08-27 21:59:31,572 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-27 21:59:31,574 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-27 21:59:31,574 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-27 21:59:31,585 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-27 21:59:31,585 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.08 09:59:30" (1/3) ... [2020-08-27 21:59:31,586 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1862b0f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 09:59:31, skipping insertion in model container [2020-08-27 21:59:31,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:31" (2/3) ... [2020-08-27 21:59:31,587 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1862b0f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 09:59:31, skipping insertion in model container [2020-08-27 21:59:31,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 09:59:31" (3/3) ... [2020-08-27 21:59:31,593 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-27 21:59:31,619 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-27 21:59:31,638 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-27 21:59:31,675 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-27 21:59:31,708 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-27 21:59:31,709 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-27 21:59:31,709 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-27 21:59:31,709 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-27 21:59:31,709 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-27 21:59:31,710 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-27 21:59:31,710 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-27 21:59:31,710 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-27 21:59:31,736 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-27 21:59:31,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-27 21:59:31,749 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:31,750 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:31,751 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:31,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:31,759 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-27 21:59:31,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:31,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [141956433] [2020-08-27 21:59:31,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:31,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:31,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:31,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:31,915 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:31,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [141956433] [2020-08-27 21:59:31,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:59:31,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-27 21:59:31,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870219257] [2020-08-27 21:59:31,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-27 21:59:31,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:31,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-27 21:59:31,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-27 21:59:31,949 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-27 21:59:31,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:31,979 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-27 21:59:31,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-27 21:59:31,981 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-27 21:59:31,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:31,993 INFO L225 Difference]: With dead ends: 35 [2020-08-27 21:59:31,994 INFO L226 Difference]: Without dead ends: 15 [2020-08-27 21:59:31,998 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 [2020-08-27 21:59:32,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-27 21:59:32,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-27 21:59:32,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-27 21:59:32,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-27 21:59:32,047 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-27 21:59:32,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:32,048 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-27 21:59:32,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-27 21:59:32,048 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-27 21:59:32,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-27 21:59:32,049 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:32,049 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:32,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-27 21:59:32,050 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:32,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:32,051 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-27 21:59:32,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:32,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343847788] [2020-08-27 21:59:32,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:32,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:32,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:32,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:32,103 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:32,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343847788] [2020-08-27 21:59:32,103 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:59:32,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-27 21:59:32,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333478735] [2020-08-27 21:59:32,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-27 21:59:32,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:32,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-27 21:59:32,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-27 21:59:32,108 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-27 21:59:32,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:32,127 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-27 21:59:32,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-27 21:59:32,128 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-27 21:59:32,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:32,129 INFO L225 Difference]: With dead ends: 24 [2020-08-27 21:59:32,130 INFO L226 Difference]: Without dead ends: 15 [2020-08-27 21:59:32,131 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 [2020-08-27 21:59:32,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-27 21:59:32,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-27 21:59:32,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-27 21:59:32,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-27 21:59:32,136 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-27 21:59:32,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:32,136 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-27 21:59:32,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-27 21:59:32,136 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-27 21:59:32,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-27 21:59:32,137 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:32,137 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:32,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-27 21:59:32,138 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:32,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:32,139 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-27 21:59:32,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:32,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [887610] [2020-08-27 21:59:32,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:32,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:32,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:32,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:32,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:32,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [887610] [2020-08-27 21:59:32,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:59:32,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-27 21:59:32,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322639529] [2020-08-27 21:59:32,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-27 21:59:32,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:32,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-27 21:59:32,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-27 21:59:32,430 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-27 21:59:32,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:32,467 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-27 21:59:32,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-27 21:59:32,468 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-27 21:59:32,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:32,469 INFO L225 Difference]: With dead ends: 23 [2020-08-27 21:59:32,469 INFO L226 Difference]: Without dead ends: 17 [2020-08-27 21:59:32,470 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 [2020-08-27 21:59:32,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-27 21:59:32,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-27 21:59:32,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-27 21:59:32,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-27 21:59:32,476 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-27 21:59:32,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:32,476 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-27 21:59:32,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-27 21:59:32,476 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-27 21:59:32,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-27 21:59:32,477 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:32,478 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:32,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-27 21:59:32,478 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:32,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:32,479 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-27 21:59:32,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:32,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227427743] [2020-08-27 21:59:32,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:32,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:32,734 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 15 [2020-08-27 21:59:32,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:32,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:32,742 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:32,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227427743] [2020-08-27 21:59:32,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:59:32,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-27 21:59:32,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891309029] [2020-08-27 21:59:32,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-27 21:59:32,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:32,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-27 21:59:32,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-27 21:59:32,745 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-27 21:59:32,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:32,772 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-27 21:59:32,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-27 21:59:32,773 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-27 21:59:32,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:32,774 INFO L225 Difference]: With dead ends: 26 [2020-08-27 21:59:32,774 INFO L226 Difference]: Without dead ends: 17 [2020-08-27 21:59:32,774 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 [2020-08-27 21:59:32,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-27 21:59:32,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-27 21:59:32,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-27 21:59:32,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-27 21:59:32,779 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-27 21:59:32,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:32,780 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-27 21:59:32,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-27 21:59:32,780 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-27 21:59:32,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-27 21:59:32,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:32,783 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:32,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-27 21:59:32,783 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:32,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:32,784 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-27 21:59:32,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:32,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118076056] [2020-08-27 21:59:32,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:32,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:33,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:33,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:33,024 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:33,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118076056] [2020-08-27 21:59:33,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:33,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-27 21:59:33,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086865894] [2020-08-27 21:59:33,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-27 21:59:33,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:33,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-27 21:59:33,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-27 21:59:33,028 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-27 21:59:33,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:33,149 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-27 21:59:33,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-27 21:59:33,149 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-27 21:59:33,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:33,150 INFO L225 Difference]: With dead ends: 26 [2020-08-27 21:59:33,151 INFO L226 Difference]: Without dead ends: 20 [2020-08-27 21:59:33,151 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 [2020-08-27 21:59:33,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-27 21:59:33,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-27 21:59:33,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-27 21:59:33,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-27 21:59:33,157 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-27 21:59:33,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:33,157 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-27 21:59:33,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-27 21:59:33,157 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-27 21:59:33,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-27 21:59:33,158 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:33,158 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:33,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-27 21:59:33,159 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:33,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:33,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-27 21:59:33,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:33,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1335953703] [2020-08-27 21:59:33,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:33,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:33,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:33,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:33,431 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:33,431 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1335953703] [2020-08-27 21:59:33,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:33,432 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-27 21:59:33,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051270377] [2020-08-27 21:59:33,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-27 21:59:33,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:33,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-27 21:59:33,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-27 21:59:33,434 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-27 21:59:33,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:33,588 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-27 21:59:33,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-27 21:59:33,590 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-27 21:59:33,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:33,591 INFO L225 Difference]: With dead ends: 29 [2020-08-27 21:59:33,591 INFO L226 Difference]: Without dead ends: 23 [2020-08-27 21:59:33,592 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 [2020-08-27 21:59:33,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-27 21:59:33,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-27 21:59:33,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-27 21:59:33,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-27 21:59:33,597 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-27 21:59:33,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:33,597 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-27 21:59:33,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-27 21:59:33,598 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-27 21:59:33,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-27 21:59:33,598 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:33,599 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:33,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-27 21:59:33,599 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:33,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:33,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-27 21:59:33,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:33,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567897988] [2020-08-27 21:59:33,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:33,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:33,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:33,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:33,915 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:33,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567897988] [2020-08-27 21:59:33,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:33,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-27 21:59:33,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095928956] [2020-08-27 21:59:33,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-27 21:59:33,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:33,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-27 21:59:33,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-27 21:59:33,918 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-27 21:59:38,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:38,311 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-27 21:59:38,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-27 21:59:38,312 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-27 21:59:38,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:38,313 INFO L225 Difference]: With dead ends: 32 [2020-08-27 21:59:38,313 INFO L226 Difference]: Without dead ends: 26 [2020-08-27 21:59:38,314 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 [2020-08-27 21:59:38,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-27 21:59:38,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-27 21:59:38,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-27 21:59:38,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-27 21:59:38,322 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-27 21:59:38,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:38,323 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-27 21:59:38,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-27 21:59:38,323 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-27 21:59:38,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-27 21:59:38,324 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:38,324 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:38,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-27 21:59:38,325 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:38,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:38,326 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-27 21:59:38,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:38,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448060544] [2020-08-27 21:59:38,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:38,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:38,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:38,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:38,703 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:38,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448060544] [2020-08-27 21:59:38,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:38,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-27 21:59:38,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895607446] [2020-08-27 21:59:38,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-27 21:59:38,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:38,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-27 21:59:38,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-27 21:59:38,706 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-27 21:59:38,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:38,930 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-27 21:59:38,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-27 21:59:38,931 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-27 21:59:38,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:38,932 INFO L225 Difference]: With dead ends: 35 [2020-08-27 21:59:38,932 INFO L226 Difference]: Without dead ends: 29 [2020-08-27 21:59:38,933 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 [2020-08-27 21:59:38,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-27 21:59:38,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-27 21:59:38,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-27 21:59:38,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-27 21:59:38,938 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-27 21:59:38,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:38,938 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-27 21:59:38,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-27 21:59:38,939 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-27 21:59:38,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-27 21:59:38,939 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:38,940 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:38,940 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-27 21:59:38,940 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:38,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:38,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-27 21:59:38,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:38,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [925535903] [2020-08-27 21:59:38,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:38,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:39,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:39,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:39,399 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:39,399 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [925535903] [2020-08-27 21:59:39,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:39,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-27 21:59:39,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644787255] [2020-08-27 21:59:39,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-27 21:59:39,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:39,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-27 21:59:39,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-27 21:59:39,407 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-27 21:59:43,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:43,890 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-27 21:59:43,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-27 21:59:43,891 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-27 21:59:43,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:43,894 INFO L225 Difference]: With dead ends: 38 [2020-08-27 21:59:43,894 INFO L226 Difference]: Without dead ends: 32 [2020-08-27 21:59:43,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-08-27 21:59:43,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-27 21:59:43,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-27 21:59:43,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-27 21:59:43,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-27 21:59:43,905 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-27 21:59:43,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:43,906 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-27 21:59:43,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-27 21:59:43,906 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-27 21:59:43,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-27 21:59:43,907 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:43,907 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:43,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-27 21:59:43,910 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:43,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:43,911 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-27 21:59:43,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:43,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [569517981] [2020-08-27 21:59:43,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:43,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:44,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:44,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:44,493 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:44,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [569517981] [2020-08-27 21:59:44,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:44,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-27 21:59:44,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095047235] [2020-08-27 21:59:44,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-27 21:59:44,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:44,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-27 21:59:44,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-27 21:59:44,497 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-27 21:59:51,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:51,108 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-27 21:59:51,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-27 21:59:51,109 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-27 21:59:51,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:51,110 INFO L225 Difference]: With dead ends: 41 [2020-08-27 21:59:51,110 INFO L226 Difference]: Without dead ends: 35 [2020-08-27 21:59:51,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-27 21:59:51,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-27 21:59:51,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-27 21:59:51,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-27 21:59:51,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-27 21:59:51,115 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-27 21:59:51,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:51,116 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-27 21:59:51,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-27 21:59:51,116 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-27 21:59:51,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-27 21:59:51,117 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:51,117 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:51,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-27 21:59:51,118 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:51,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:51,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-27 21:59:51,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:51,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1463067178] [2020-08-27 21:59:51,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:51,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:51,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:51,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:51,688 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:51,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1463067178] [2020-08-27 21:59:51,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:51,689 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-27 21:59:51,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223315412] [2020-08-27 21:59:51,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-27 21:59:51,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:51,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-27 21:59:51,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-27 21:59:51,691 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-27 22:00:00,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 22:00:00,449 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-27 22:00:00,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-27 22:00:00,450 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-27 22:00:00,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 22:00:00,451 INFO L225 Difference]: With dead ends: 44 [2020-08-27 22:00:00,451 INFO L226 Difference]: Without dead ends: 38 [2020-08-27 22:00:00,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=49, Invalid=412, Unknown=1, NotChecked=0, Total=462 [2020-08-27 22:00:00,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-27 22:00:00,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-27 22:00:00,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-27 22:00:00,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-27 22:00:00,459 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-27 22:00:00,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 22:00:00,459 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-27 22:00:00,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-27 22:00:00,459 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-27 22:00:00,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-27 22:00:00,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 22:00:00,461 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 22:00:00,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-27 22:00:00,461 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 22:00:00,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 22:00:00,467 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-27 22:00:00,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 22:00:00,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [569015519] [2020-08-27 22:00:00,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 22:00:00,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:01,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 22:00:01,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:01,143 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 22:00:01,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [569015519] [2020-08-27 22:00:01,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 22:00:01,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-27 22:00:01,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137580181] [2020-08-27 22:00:01,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-27 22:00:01,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 22:00:01,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-27 22:00:01,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-27 22:00:01,146 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-27 22:00:01,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 22:00:01,682 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-27 22:00:01,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-27 22:00:01,684 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-27 22:00:01,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 22:00:01,685 INFO L225 Difference]: With dead ends: 47 [2020-08-27 22:00:01,686 INFO L226 Difference]: Without dead ends: 41 [2020-08-27 22:00:01,686 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 [2020-08-27 22:00:01,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-27 22:00:01,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-27 22:00:01,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-27 22:00:01,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-27 22:00:01,691 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-27 22:00:01,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 22:00:01,691 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-27 22:00:01,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-27 22:00:01,692 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-27 22:00:01,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-27 22:00:01,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 22:00:01,693 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 22:00:01,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-27 22:00:01,693 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 22:00:01,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 22:00:01,694 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-27 22:00:01,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 22:00:01,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1739932541] [2020-08-27 22:00:01,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 22:00:01,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:02,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 22:00:02,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:02,466 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 22:00:02,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1739932541] [2020-08-27 22:00:02,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 22:00:02,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-27 22:00:02,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220050983] [2020-08-27 22:00:02,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-27 22:00:02,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 22:00:02,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-27 22:00:02,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-27 22:00:02,468 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-27 22:00:13,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 22:00:13,511 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-27 22:00:13,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-27 22:00:13,512 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-27 22:00:13,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 22:00:13,513 INFO L225 Difference]: With dead ends: 50 [2020-08-27 22:00:13,513 INFO L226 Difference]: Without dead ends: 44 [2020-08-27 22:00:13,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=57, Invalid=590, Unknown=3, NotChecked=0, Total=650 [2020-08-27 22:00:13,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-27 22:00:13,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-27 22:00:13,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-27 22:00:13,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-27 22:00:13,521 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-27 22:00:13,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 22:00:13,521 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-27 22:00:13,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-27 22:00:13,522 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-27 22:00:13,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-27 22:00:13,523 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 22:00:13,523 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 22:00:13,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-27 22:00:13,523 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 22:00:13,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 22:00:13,524 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-27 22:00:13,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 22:00:13,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786593797] [2020-08-27 22:00:13,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 22:00:13,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:14,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 22:00:14,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:14,490 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 22:00:14,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786593797] [2020-08-27 22:00:14,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 22:00:14,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-27 22:00:14,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498382169] [2020-08-27 22:00:14,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-27 22:00:14,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 22:00:14,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-27 22:00:14,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-27 22:00:14,492 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-27 22:00:38,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 22:00:38,275 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-27 22:00:38,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-27 22:00:38,276 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-27 22:00:38,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 22:00:38,277 INFO L225 Difference]: With dead ends: 53 [2020-08-27 22:00:38,277 INFO L226 Difference]: Without dead ends: 47 [2020-08-27 22:00:38,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=61, Invalid=691, Unknown=4, NotChecked=0, Total=756 [2020-08-27 22:00:38,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-27 22:00:38,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-27 22:00:38,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-27 22:00:38,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-27 22:00:38,288 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-27 22:00:38,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 22:00:38,288 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-27 22:00:38,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-27 22:00:38,289 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-27 22:00:38,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-27 22:00:38,293 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 22:00:38,293 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 22:00:38,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-27 22:00:38,293 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 22:00:38,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 22:00:38,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-27 22:00:38,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 22:00:38,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1115151892] [2020-08-27 22:00:38,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 22:00:38,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:39,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 22:00:39,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:39,382 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 22:00:39,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1115151892] [2020-08-27 22:00:39,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 22:00:39,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-27 22:00:39,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120022310] [2020-08-27 22:00:39,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-27 22:00:39,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 22:00:39,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-27 22:00:39,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-27 22:00:39,384 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states.