/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/array-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:28:02,358 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:28:02,363 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:28:02,409 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:28:02,409 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:28:02,421 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:28:02,424 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:28:02,428 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:28:02,431 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:28:02,435 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:28:02,436 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:28:02,437 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:28:02,438 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:28:02,441 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:28:02,444 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:28:02,446 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:28:02,448 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:28:02,451 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:28:02,453 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:28:02,461 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:28:02,463 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:28:02,465 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:28:02,466 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:28:02,467 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:28:02,471 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-21 10:28:02,486 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:28:02,487 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:28:02,489 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:28:02,490 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-21 10:28:02,540 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:28:02,540 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:28:02,543 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:28:02,543 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:28:02,543 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:28:02,543 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:28:02,544 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:28:02,544 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:28:02,544 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:28:02,544 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:28:02,546 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:28:02,546 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:28:02,546 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:28:02,546 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:28:02,547 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:28:02,547 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:28:02,547 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:28:02,547 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:28:02,548 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:28:02,548 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:28:02,548 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:28:02,548 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:28:02,548 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:28:02,549 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:28:02,549 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:28:02,549 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:28:02,549 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:28:02,549 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:28:02,550 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:28:02,550 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 [2020-09-21 10:28:03,033 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:28:03,054 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:28:03,060 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:28:03,062 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:28:03,063 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:28:03,064 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-09-21 10:28:03,153 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c203beb3e/7a52bc74031445d3acb07aad8f66cf90/FLAGccceac032 [2020-09-21 10:28:03,722 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:28:03,723 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-09-21 10:28:03,732 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c203beb3e/7a52bc74031445d3acb07aad8f66cf90/FLAGccceac032 [2020-09-21 10:28:04,036 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c203beb3e/7a52bc74031445d3acb07aad8f66cf90 [2020-09-21 10:28:04,051 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:28:04,057 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:28:04,058 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:28:04,058 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:28:04,062 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:28:04,063 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:28:04" (1/1) ... [2020-09-21 10:28:04,067 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57e8ecf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:04, skipping insertion in model container [2020-09-21 10:28:04,068 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:28:04" (1/1) ... [2020-09-21 10:28:04,076 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:28:04,100 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:28:04,333 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:28:04,342 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:28:04,362 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:28:04,378 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:28:04,379 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:04 WrapperNode [2020-09-21 10:28:04,379 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:28:04,380 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:28:04,380 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:28:04,380 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:28:04,506 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:04" (1/1) ... [2020-09-21 10:28:04,506 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:04" (1/1) ... [2020-09-21 10:28:04,517 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:04" (1/1) ... [2020-09-21 10:28:04,518 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:04" (1/1) ... [2020-09-21 10:28:04,527 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:04" (1/1) ... [2020-09-21 10:28:04,534 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:04" (1/1) ... [2020-09-21 10:28:04,535 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:04" (1/1) ... [2020-09-21 10:28:04,538 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:28:04,539 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:28:04,539 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:28:04,539 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:28:04,540 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:04" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:28:04,622 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:28:04,622 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:28:04,622 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-21 10:28:04,623 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-09-21 10:28:04,623 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:28:04,623 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-09-21 10:28:04,623 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:28:04,624 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-21 10:28:04,624 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-09-21 10:28:04,624 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-09-21 10:28:04,624 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-09-21 10:28:04,624 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:28:04,625 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-21 10:28:04,625 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-09-21 10:28:04,625 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-21 10:28:04,625 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:28:04,625 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:28:04,932 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:28:04,932 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-21 10:28:04,939 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:28:04 BoogieIcfgContainer [2020-09-21 10:28:04,940 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:28:04,941 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:28:04,941 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:28:04,946 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:28:04,946 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:28:04" (1/3) ... [2020-09-21 10:28:04,947 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4148a5f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:28:04, skipping insertion in model container [2020-09-21 10:28:04,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:04" (2/3) ... [2020-09-21 10:28:04,948 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4148a5f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:28:04, skipping insertion in model container [2020-09-21 10:28:04,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:28:04" (3/3) ... [2020-09-21 10:28:04,950 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-09-21 10:28:04,980 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:28:04,991 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:28:05,024 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:28:05,055 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:28:05,056 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:28:05,056 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:28:05,056 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:28:05,056 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:28:05,056 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:28:05,056 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:28:05,056 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:28:05,078 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-09-21 10:28:05,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-21 10:28:05,085 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:05,086 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] [2020-09-21 10:28:05,086 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:05,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:05,093 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-09-21 10:28:05,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:05,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607927551] [2020-09-21 10:28:05,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:05,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:05,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:05,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:05,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:05,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:05,370 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:05,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607927551] [2020-09-21 10:28:05,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:05,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:28:05,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831693892] [2020-09-21 10:28:05,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:28:05,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:05,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:28:05,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:28:05,406 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-09-21 10:28:05,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:05,673 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-09-21 10:28:05,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 10:28:05,675 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-09-21 10:28:05,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:05,690 INFO L225 Difference]: With dead ends: 59 [2020-09-21 10:28:05,690 INFO L226 Difference]: Without dead ends: 31 [2020-09-21 10:28:05,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:28:05,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-21 10:28:05,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-09-21 10:28:05,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-21 10:28:05,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-09-21 10:28:05,751 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-09-21 10:28:05,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:05,751 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-09-21 10:28:05,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:28:05,752 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-09-21 10:28:05,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-21 10:28:05,753 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:05,753 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] [2020-09-21 10:28:05,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:28:05,754 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:05,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:05,755 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-09-21 10:28:05,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:05,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073143785] [2020-09-21 10:28:05,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:05,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:05,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:05,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:05,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:05,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:05,974 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:05,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073143785] [2020-09-21 10:28:05,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:05,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-21 10:28:05,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551359444] [2020-09-21 10:28:05,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:28:05,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:05,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:28:05,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:28:05,979 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-09-21 10:28:06,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:06,189 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-09-21 10:28:06,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:28:06,190 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-09-21 10:28:06,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:06,191 INFO L225 Difference]: With dead ends: 48 [2020-09-21 10:28:06,191 INFO L226 Difference]: Without dead ends: 30 [2020-09-21 10:28:06,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:28:06,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-21 10:28:06,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-09-21 10:28:06,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-09-21 10:28:06,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-09-21 10:28:06,202 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-09-21 10:28:06,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:06,203 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-09-21 10:28:06,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:28:06,203 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-09-21 10:28:06,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 10:28:06,204 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:06,204 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:06,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:28:06,205 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:06,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:06,206 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-09-21 10:28:06,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:06,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1770843878] [2020-09-21 10:28:06,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:06,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:06,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:06,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:06,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:06,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:06,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:06,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1770843878] [2020-09-21 10:28:06,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:06,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:28:06,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035353885] [2020-09-21 10:28:06,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:28:06,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:06,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:28:06,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:28:06,447 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-09-21 10:28:06,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:06,635 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-09-21 10:28:06,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:28:06,636 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-09-21 10:28:06,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:06,637 INFO L225 Difference]: With dead ends: 50 [2020-09-21 10:28:06,637 INFO L226 Difference]: Without dead ends: 32 [2020-09-21 10:28:06,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:28:06,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-09-21 10:28:06,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-09-21 10:28:06,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-21 10:28:06,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-09-21 10:28:06,645 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-09-21 10:28:06,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:06,646 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-09-21 10:28:06,646 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:28:06,646 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-09-21 10:28:06,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-21 10:28:06,647 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:06,647 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:06,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:28:06,648 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:06,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:06,648 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-09-21 10:28:06,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:06,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261002778] [2020-09-21 10:28:06,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:06,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:06,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:06,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:06,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:06,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:06,936 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:06,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261002778] [2020-09-21 10:28:06,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:06,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:28:06,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603044018] [2020-09-21 10:28:06,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:28:06,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:06,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:28:06,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:28:06,942 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-09-21 10:28:07,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:07,140 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-09-21 10:28:07,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:28:07,141 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-09-21 10:28:07,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:07,142 INFO L225 Difference]: With dead ends: 52 [2020-09-21 10:28:07,142 INFO L226 Difference]: Without dead ends: 34 [2020-09-21 10:28:07,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:28:07,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-21 10:28:07,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-09-21 10:28:07,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-09-21 10:28:07,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-09-21 10:28:07,155 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-09-21 10:28:07,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:07,155 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-09-21 10:28:07,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:28:07,157 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-09-21 10:28:07,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-21 10:28:07,158 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:07,159 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, 1, 1] [2020-09-21 10:28:07,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:28:07,159 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:07,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:07,160 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-09-21 10:28:07,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:07,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [138705164] [2020-09-21 10:28:07,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:07,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:07,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:07,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,450 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:07,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [138705164] [2020-09-21 10:28:07,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:07,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:28:07,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405718313] [2020-09-21 10:28:07,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:28:07,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:07,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:28:07,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:28:07,454 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-09-21 10:28:07,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:07,636 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-09-21 10:28:07,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:28:07,637 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-09-21 10:28:07,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:07,638 INFO L225 Difference]: With dead ends: 54 [2020-09-21 10:28:07,638 INFO L226 Difference]: Without dead ends: 36 [2020-09-21 10:28:07,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:28:07,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-09-21 10:28:07,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-09-21 10:28:07,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-09-21 10:28:07,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-09-21 10:28:07,645 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-09-21 10:28:07,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:07,646 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-09-21 10:28:07,646 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:28:07,646 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-09-21 10:28:07,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:28:07,647 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:07,647 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, 1, 1] [2020-09-21 10:28:07,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:28:07,648 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:07,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:07,648 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-09-21 10:28:07,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:07,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [945814213] [2020-09-21 10:28:07,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:07,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:07,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:07,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,909 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:07,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [945814213] [2020-09-21 10:28:07,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:07,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:28:07,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132305856] [2020-09-21 10:28:07,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:28:07,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:07,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:28:07,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:28:07,912 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-09-21 10:28:08,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:08,103 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-09-21 10:28:08,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:28:08,104 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-09-21 10:28:08,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:08,107 INFO L225 Difference]: With dead ends: 56 [2020-09-21 10:28:08,107 INFO L226 Difference]: Without dead ends: 38 [2020-09-21 10:28:08,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:28:08,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-09-21 10:28:08,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-09-21 10:28:08,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-21 10:28:08,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-09-21 10:28:08,114 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-09-21 10:28:08,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:08,114 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-09-21 10:28:08,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:28:08,114 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-09-21 10:28:08,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-21 10:28:08,115 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:08,115 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, 1, 1] [2020-09-21 10:28:08,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:28:08,116 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:08,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:08,116 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-09-21 10:28:08,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:08,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1144775266] [2020-09-21 10:28:08,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:08,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:08,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:08,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:08,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:08,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:08,441 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:08,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1144775266] [2020-09-21 10:28:08,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:08,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-21 10:28:08,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026791472] [2020-09-21 10:28:08,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-21 10:28:08,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:08,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-21 10:28:08,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:28:08,444 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-09-21 10:28:08,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:08,626 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-09-21 10:28:08,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 10:28:08,627 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-09-21 10:28:08,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:08,628 INFO L225 Difference]: With dead ends: 58 [2020-09-21 10:28:08,628 INFO L226 Difference]: Without dead ends: 40 [2020-09-21 10:28:08,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:28:08,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-09-21 10:28:08,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-09-21 10:28:08,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-09-21 10:28:08,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-09-21 10:28:08,637 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-09-21 10:28:08,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:08,638 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-09-21 10:28:08,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-21 10:28:08,639 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-09-21 10:28:08,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-21 10:28:08,643 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:08,643 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, 1, 1] [2020-09-21 10:28:08,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:28:08,644 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:08,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:08,644 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-09-21 10:28:08,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:08,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153012577] [2020-09-21 10:28:08,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:08,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:08,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:08,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:08,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:08,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:09,054 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:09,054 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153012577] [2020-09-21 10:28:09,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:09,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-21 10:28:09,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349744300] [2020-09-21 10:28:09,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-21 10:28:09,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:09,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-21 10:28:09,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:28:09,056 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-09-21 10:28:09,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:09,311 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-09-21 10:28:09,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:28:09,311 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-09-21 10:28:09,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:09,312 INFO L225 Difference]: With dead ends: 60 [2020-09-21 10:28:09,312 INFO L226 Difference]: Without dead ends: 42 [2020-09-21 10:28:09,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:28:09,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-09-21 10:28:09,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-09-21 10:28:09,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-21 10:28:09,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-09-21 10:28:09,319 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-09-21 10:28:09,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:09,320 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-09-21 10:28:09,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-21 10:28:09,320 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-09-21 10:28:09,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-21 10:28:09,321 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:09,321 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, 1, 1] [2020-09-21 10:28:09,321 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:28:09,321 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:09,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:09,322 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-09-21 10:28:09,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:09,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727218076] [2020-09-21 10:28:09,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:09,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:09,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:09,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:09,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:09,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:09,773 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:09,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727218076] [2020-09-21 10:28:09,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:09,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:28:09,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039581940] [2020-09-21 10:28:09,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:28:09,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:09,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:28:09,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:28:09,775 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-09-21 10:28:10,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:10,000 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-09-21 10:28:10,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-21 10:28:10,001 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-09-21 10:28:10,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:10,003 INFO L225 Difference]: With dead ends: 62 [2020-09-21 10:28:10,003 INFO L226 Difference]: Without dead ends: 44 [2020-09-21 10:28:10,004 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:28:10,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-21 10:28:10,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-09-21 10:28:10,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-09-21 10:28:10,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-09-21 10:28:10,013 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-09-21 10:28:10,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:10,013 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-09-21 10:28:10,013 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:28:10,014 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-09-21 10:28:10,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-21 10:28:10,014 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:10,014 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, 1, 1] [2020-09-21 10:28:10,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:28:10,016 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:10,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:10,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-09-21 10:28:10,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:10,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1806168856] [2020-09-21 10:28:10,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:10,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:10,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:10,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:10,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:10,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:10,548 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:10,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1806168856] [2020-09-21 10:28:10,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:10,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 10:28:10,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962946700] [2020-09-21 10:28:10,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 10:28:10,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:10,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 10:28:10,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:28:10,550 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-09-21 10:28:10,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:10,839 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-09-21 10:28:10,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-21 10:28:10,839 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-09-21 10:28:10,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:10,840 INFO L225 Difference]: With dead ends: 64 [2020-09-21 10:28:10,840 INFO L226 Difference]: Without dead ends: 46 [2020-09-21 10:28:10,841 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:28:10,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-21 10:28:10,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-09-21 10:28:10,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-09-21 10:28:10,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-09-21 10:28:10,848 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-09-21 10:28:10,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:10,848 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-09-21 10:28:10,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 10:28:10,848 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-09-21 10:28:10,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-09-21 10:28:10,849 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:10,849 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, 1, 1] [2020-09-21 10:28:10,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 10:28:10,850 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:10,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:10,850 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-09-21 10:28:10,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:10,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1964839448] [2020-09-21 10:28:10,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:10,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:10,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:10,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:10,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:10,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:10,962 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-09-21 10:28:10,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1964839448] [2020-09-21 10:28:10,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:10,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 10:28:10,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377522965] [2020-09-21 10:28:10,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:28:10,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:10,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:28:10,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:28:10,965 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-09-21 10:28:11,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:11,053 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-09-21 10:28:11,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:28:11,054 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-09-21 10:28:11,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:11,056 INFO L225 Difference]: With dead ends: 65 [2020-09-21 10:28:11,056 INFO L226 Difference]: Without dead ends: 53 [2020-09-21 10:28:11,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:28:11,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-09-21 10:28:11,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-09-21 10:28:11,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-09-21 10:28:11,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-09-21 10:28:11,069 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-09-21 10:28:11,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:11,070 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-09-21 10:28:11,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:28:11,070 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-09-21 10:28:11,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-21 10:28:11,071 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:11,071 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, 1, 1, 1, 1, 1] [2020-09-21 10:28:11,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 10:28:11,072 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:11,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:11,072 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-09-21 10:28:11,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:11,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1454594975] [2020-09-21 10:28:11,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:11,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:11,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:11,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,159 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-09-21 10:28:11,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1454594975] [2020-09-21 10:28:11,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:11,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:28:11,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657981431] [2020-09-21 10:28:11,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:28:11,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:11,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:28:11,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:28:11,161 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-09-21 10:28:11,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:11,270 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-09-21 10:28:11,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:28:11,270 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-09-21 10:28:11,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:11,271 INFO L225 Difference]: With dead ends: 73 [2020-09-21 10:28:11,272 INFO L226 Difference]: Without dead ends: 61 [2020-09-21 10:28:11,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:28:11,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-09-21 10:28:11,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-09-21 10:28:11,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-21 10:28:11,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-09-21 10:28:11,282 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-09-21 10:28:11,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:11,283 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-09-21 10:28:11,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:28:11,283 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-09-21 10:28:11,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-21 10:28:11,287 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:11,287 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:11,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-21 10:28:11,288 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:11,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:11,288 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-09-21 10:28:11,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:11,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [633521773] [2020-09-21 10:28:11,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:11,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:11,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:11,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,387 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-09-21 10:28:11,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [633521773] [2020-09-21 10:28:11,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:11,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 10:28:11,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932157267] [2020-09-21 10:28:11,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:28:11,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:11,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:28:11,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:28:11,390 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-09-21 10:28:11,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:11,466 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-09-21 10:28:11,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:28:11,466 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-09-21 10:28:11,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:11,467 INFO L225 Difference]: With dead ends: 69 [2020-09-21 10:28:11,467 INFO L226 Difference]: Without dead ends: 49 [2020-09-21 10:28:11,468 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:28:11,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-09-21 10:28:11,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-09-21 10:28:11,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-21 10:28:11,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-09-21 10:28:11,480 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-09-21 10:28:11,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:11,480 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-09-21 10:28:11,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:28:11,481 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-09-21 10:28:11,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-21 10:28:11,481 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:11,482 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:11,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-21 10:28:11,482 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:11,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:11,482 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-09-21 10:28:11,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:11,485 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1575235608] [2020-09-21 10:28:11,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:11,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:11,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:11,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:12,089 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:12,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1575235608] [2020-09-21 10:28:12,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:12,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-21 10:28:12,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361364386] [2020-09-21 10:28:12,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-21 10:28:12,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:12,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-21 10:28:12,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:28:12,092 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-09-21 10:28:12,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:12,370 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-09-21 10:28:12,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-21 10:28:12,370 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-09-21 10:28:12,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:12,372 INFO L225 Difference]: With dead ends: 74 [2020-09-21 10:28:12,372 INFO L226 Difference]: Without dead ends: 52 [2020-09-21 10:28:12,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:28:12,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-09-21 10:28:12,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-09-21 10:28:12,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-09-21 10:28:12,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-09-21 10:28:12,381 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-09-21 10:28:12,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:12,381 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-09-21 10:28:12,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-21 10:28:12,381 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-09-21 10:28:12,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-09-21 10:28:12,382 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:12,383 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:12,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-21 10:28:12,383 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:12,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:12,383 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-09-21 10:28:12,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:12,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1613052273] [2020-09-21 10:28:12,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:12,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:12,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:12,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:12,467 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:12,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:12,978 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:12,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1613052273] [2020-09-21 10:28:12,980 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:12,980 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-21 10:28:12,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738742047] [2020-09-21 10:28:12,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-21 10:28:12,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:12,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-21 10:28:12,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:28:12,983 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-09-21 10:28:13,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:13,242 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-09-21 10:28:13,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 10:28:13,243 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-09-21 10:28:13,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:13,243 INFO L225 Difference]: With dead ends: 76 [2020-09-21 10:28:13,244 INFO L226 Difference]: Without dead ends: 54 [2020-09-21 10:28:13,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:28:13,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-09-21 10:28:13,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-09-21 10:28:13,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-09-21 10:28:13,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-09-21 10:28:13,250 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-09-21 10:28:13,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:13,250 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-09-21 10:28:13,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-21 10:28:13,251 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-09-21 10:28:13,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-21 10:28:13,251 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:13,251 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:13,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-21 10:28:13,252 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:13,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:13,252 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-09-21 10:28:13,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:13,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [537232921] [2020-09-21 10:28:13,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:13,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:13,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:13,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:13,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:13,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:13,960 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:13,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [537232921] [2020-09-21 10:28:13,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:13,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-21 10:28:13,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229510362] [2020-09-21 10:28:13,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-21 10:28:13,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:13,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-21 10:28:13,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:28:13,963 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-09-21 10:28:14,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:14,248 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-09-21 10:28:14,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-21 10:28:14,249 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-09-21 10:28:14,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:14,250 INFO L225 Difference]: With dead ends: 78 [2020-09-21 10:28:14,250 INFO L226 Difference]: Without dead ends: 56 [2020-09-21 10:28:14,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:28:14,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-09-21 10:28:14,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-09-21 10:28:14,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-09-21 10:28:14,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-09-21 10:28:14,264 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-09-21 10:28:14,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:14,264 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-09-21 10:28:14,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-21 10:28:14,264 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-09-21 10:28:14,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-09-21 10:28:14,268 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:14,268 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:14,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-21 10:28:14,269 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:14,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:14,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-09-21 10:28:14,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:14,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741628028] [2020-09-21 10:28:14,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:14,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:14,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:14,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:14,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:14,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:14,948 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:14,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741628028] [2020-09-21 10:28:14,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:14,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-21 10:28:14,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595244583] [2020-09-21 10:28:14,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-21 10:28:14,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:14,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-21 10:28:14,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:28:14,951 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-09-21 10:28:15,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:15,221 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-09-21 10:28:15,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-21 10:28:15,221 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-09-21 10:28:15,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:15,222 INFO L225 Difference]: With dead ends: 80 [2020-09-21 10:28:15,222 INFO L226 Difference]: Without dead ends: 58 [2020-09-21 10:28:15,223 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:28:15,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-09-21 10:28:15,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-09-21 10:28:15,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-09-21 10:28:15,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-09-21 10:28:15,228 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-09-21 10:28:15,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:15,228 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-09-21 10:28:15,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-21 10:28:15,229 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-09-21 10:28:15,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-09-21 10:28:15,229 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:15,229 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:15,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-21 10:28:15,230 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:15,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:15,230 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-09-21 10:28:15,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:15,231 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2145878589] [2020-09-21 10:28:15,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:15,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:15,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:15,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:15,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:15,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:16,035 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:16,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2145878589] [2020-09-21 10:28:16,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:16,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-21 10:28:16,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852712234] [2020-09-21 10:28:16,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-21 10:28:16,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:16,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-21 10:28:16,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:28:16,037 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-09-21 10:28:16,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:16,355 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-09-21 10:28:16,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-21 10:28:16,356 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-09-21 10:28:16,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:16,357 INFO L225 Difference]: With dead ends: 82 [2020-09-21 10:28:16,357 INFO L226 Difference]: Without dead ends: 60 [2020-09-21 10:28:16,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:28:16,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-09-21 10:28:16,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-09-21 10:28:16,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-09-21 10:28:16,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-09-21 10:28:16,365 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-09-21 10:28:16,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:16,365 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-09-21 10:28:16,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-21 10:28:16,366 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-09-21 10:28:16,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-09-21 10:28:16,366 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:16,366 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:16,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-21 10:28:16,367 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:16,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:16,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-09-21 10:28:16,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:16,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [78312257] [2020-09-21 10:28:16,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:16,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:16,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:16,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:16,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:16,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:17,272 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:17,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [78312257] [2020-09-21 10:28:17,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:17,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-09-21 10:28:17,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611015083] [2020-09-21 10:28:17,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-21 10:28:17,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:17,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-21 10:28:17,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:28:17,274 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-09-21 10:28:17,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:17,605 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-09-21 10:28:17,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-21 10:28:17,606 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-09-21 10:28:17,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:17,607 INFO L225 Difference]: With dead ends: 84 [2020-09-21 10:28:17,607 INFO L226 Difference]: Without dead ends: 62 [2020-09-21 10:28:17,608 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:28:17,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-09-21 10:28:17,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-09-21 10:28:17,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-09-21 10:28:17,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-09-21 10:28:17,613 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-09-21 10:28:17,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:17,614 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-09-21 10:28:17,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-21 10:28:17,614 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-09-21 10:28:17,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-09-21 10:28:17,614 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:17,615 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:17,615 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-21 10:28:17,615 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:17,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:17,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-09-21 10:28:17,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:17,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [57590601] [2020-09-21 10:28:17,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:17,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:17,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:17,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:17,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:17,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:18,544 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:18,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [57590601] [2020-09-21 10:28:18,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:18,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-21 10:28:18,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777469765] [2020-09-21 10:28:18,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-21 10:28:18,545 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:18,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-21 10:28:18,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:28:18,546 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-09-21 10:28:18,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:18,826 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-09-21 10:28:18,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-21 10:28:18,827 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-09-21 10:28:18,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:18,827 INFO L225 Difference]: With dead ends: 86 [2020-09-21 10:28:18,828 INFO L226 Difference]: Without dead ends: 64 [2020-09-21 10:28:18,828 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:28:18,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-09-21 10:28:18,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-09-21 10:28:18,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-09-21 10:28:18,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-09-21 10:28:18,833 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-09-21 10:28:18,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:18,833 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-09-21 10:28:18,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-21 10:28:18,834 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-09-21 10:28:18,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-09-21 10:28:18,834 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:18,835 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:18,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-21 10:28:18,835 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:18,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:18,835 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-09-21 10:28:18,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:18,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1318474366] [2020-09-21 10:28:18,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:18,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:18,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:18,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:18,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:18,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:19,777 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:19,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1318474366] [2020-09-21 10:28:19,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:19,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-21 10:28:19,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068687409] [2020-09-21 10:28:19,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-21 10:28:19,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:19,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-21 10:28:19,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:28:19,780 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-09-21 10:28:20,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:20,149 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-09-21 10:28:20,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-21 10:28:20,150 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-09-21 10:28:20,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:20,151 INFO L225 Difference]: With dead ends: 88 [2020-09-21 10:28:20,151 INFO L226 Difference]: Without dead ends: 66 [2020-09-21 10:28:20,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:28:20,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-09-21 10:28:20,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-09-21 10:28:20,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-09-21 10:28:20,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-09-21 10:28:20,156 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-09-21 10:28:20,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:20,157 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-09-21 10:28:20,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-21 10:28:20,157 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-09-21 10:28:20,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-09-21 10:28:20,157 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:20,158 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:20,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-21 10:28:20,158 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:20,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:20,158 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-09-21 10:28:20,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:20,159 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142047669] [2020-09-21 10:28:20,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:20,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:20,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:20,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:20,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:20,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:21,303 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:21,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142047669] [2020-09-21 10:28:21,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:21,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-21 10:28:21,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391837992] [2020-09-21 10:28:21,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-21 10:28:21,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:21,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-21 10:28:21,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:28:21,306 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-09-21 10:28:21,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:21,677 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-09-21 10:28:21,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-09-21 10:28:21,680 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-09-21 10:28:21,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:21,681 INFO L225 Difference]: With dead ends: 90 [2020-09-21 10:28:21,681 INFO L226 Difference]: Without dead ends: 68 [2020-09-21 10:28:21,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:28:21,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-21 10:28:21,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-09-21 10:28:21,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-09-21 10:28:21,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-09-21 10:28:21,689 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-09-21 10:28:21,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:21,689 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-09-21 10:28:21,689 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-21 10:28:21,689 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-09-21 10:28:21,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-09-21 10:28:21,690 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:21,690 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:21,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-21 10:28:21,691 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:21,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:21,691 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-09-21 10:28:21,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:21,691 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513047437] [2020-09-21 10:28:21,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:21,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:21,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:21,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:21,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:21,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:22,790 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:22,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513047437] [2020-09-21 10:28:22,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:22,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-09-21 10:28:22,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690208928] [2020-09-21 10:28:22,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-09-21 10:28:22,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:22,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-09-21 10:28:22,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:28:22,792 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-09-21 10:28:23,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:23,130 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-09-21 10:28:23,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-21 10:28:23,131 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-09-21 10:28:23,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:23,132 INFO L225 Difference]: With dead ends: 92 [2020-09-21 10:28:23,132 INFO L226 Difference]: Without dead ends: 70 [2020-09-21 10:28:23,133 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:28:23,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-09-21 10:28:23,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-09-21 10:28:23,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-09-21 10:28:23,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-09-21 10:28:23,138 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-09-21 10:28:23,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:23,138 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-09-21 10:28:23,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-09-21 10:28:23,139 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-09-21 10:28:23,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-09-21 10:28:23,139 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:23,139 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:23,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-21 10:28:23,140 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:23,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:23,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-09-21 10:28:23,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:23,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [931060920] [2020-09-21 10:28:23,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:23,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:23,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:23,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:23,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:23,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:24,289 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:24,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [931060920] [2020-09-21 10:28:24,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:24,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-09-21 10:28:24,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579666313] [2020-09-21 10:28:24,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-09-21 10:28:24,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:24,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-09-21 10:28:24,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:28:24,291 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-09-21 10:28:24,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:24,657 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-09-21 10:28:24,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-09-21 10:28:24,658 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-09-21 10:28:24,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:24,659 INFO L225 Difference]: With dead ends: 94 [2020-09-21 10:28:24,659 INFO L226 Difference]: Without dead ends: 72 [2020-09-21 10:28:24,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:28:24,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-09-21 10:28:24,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-09-21 10:28:24,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-09-21 10:28:24,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-09-21 10:28:24,665 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-09-21 10:28:24,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:24,665 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-09-21 10:28:24,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-09-21 10:28:24,665 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-09-21 10:28:24,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-09-21 10:28:24,666 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:24,666 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:24,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-09-21 10:28:24,667 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:24,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:24,667 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-09-21 10:28:24,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:24,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [951028538] [2020-09-21 10:28:24,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:24,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:24,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:24,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:24,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:24,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:25,916 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:25,917 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [951028538] [2020-09-21 10:28:25,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:25,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-09-21 10:28:25,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901397335] [2020-09-21 10:28:25,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-09-21 10:28:25,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:25,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-09-21 10:28:25,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:28:25,918 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-09-21 10:28:26,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:26,348 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-09-21 10:28:26,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-09-21 10:28:26,348 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-09-21 10:28:26,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:26,349 INFO L225 Difference]: With dead ends: 96 [2020-09-21 10:28:26,349 INFO L226 Difference]: Without dead ends: 74 [2020-09-21 10:28:26,350 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:28:26,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-09-21 10:28:26,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-09-21 10:28:26,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-09-21 10:28:26,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-09-21 10:28:26,355 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-09-21 10:28:26,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:26,355 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-09-21 10:28:26,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-09-21 10:28:26,355 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-09-21 10:28:26,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-09-21 10:28:26,356 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:26,356 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:26,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-09-21 10:28:26,357 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:26,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:26,357 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-09-21 10:28:26,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:26,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448562562] [2020-09-21 10:28:26,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:26,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:26,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:26,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:26,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:26,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:27,704 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:27,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448562562] [2020-09-21 10:28:27,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:27,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-09-21 10:28:27,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296080837] [2020-09-21 10:28:27,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-09-21 10:28:27,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:27,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-09-21 10:28:27,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:28:27,706 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-09-21 10:28:27,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:27,983 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-09-21 10:28:27,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-21 10:28:27,984 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-09-21 10:28:27,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:27,984 INFO L225 Difference]: With dead ends: 98 [2020-09-21 10:28:27,984 INFO L226 Difference]: Without dead ends: 76 [2020-09-21 10:28:27,985 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:28:27,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-09-21 10:28:27,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-09-21 10:28:27,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-09-21 10:28:27,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-09-21 10:28:27,990 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-09-21 10:28:27,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:27,991 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-09-21 10:28:27,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-09-21 10:28:27,991 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-09-21 10:28:27,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-09-21 10:28:27,992 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:27,992 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:27,992 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-09-21 10:28:27,992 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:27,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:27,993 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-09-21 10:28:27,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:27,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1519482243] [2020-09-21 10:28:27,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:28,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:28,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:28,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:28,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:28,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:29,425 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:29,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1519482243] [2020-09-21 10:28:29,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:29,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-09-21 10:28:29,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130878076] [2020-09-21 10:28:29,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-09-21 10:28:29,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:29,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-09-21 10:28:29,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:28:29,427 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-09-21 10:28:29,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:29,799 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-09-21 10:28:29,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-09-21 10:28:29,799 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-09-21 10:28:29,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:29,800 INFO L225 Difference]: With dead ends: 100 [2020-09-21 10:28:29,800 INFO L226 Difference]: Without dead ends: 78 [2020-09-21 10:28:29,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:28:29,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-09-21 10:28:29,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-09-21 10:28:29,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-09-21 10:28:29,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-09-21 10:28:29,807 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-09-21 10:28:29,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:29,809 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-09-21 10:28:29,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-09-21 10:28:29,810 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-09-21 10:28:29,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-09-21 10:28:29,810 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:29,810 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:29,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-09-21 10:28:29,811 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:29,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:29,811 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-09-21 10:28:29,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:29,812 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212287727] [2020-09-21 10:28:29,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:29,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:29,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:29,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:29,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:29,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:31,333 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:31,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1212287727] [2020-09-21 10:28:31,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:31,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-21 10:28:31,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520979981] [2020-09-21 10:28:31,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-21 10:28:31,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:31,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-21 10:28:31,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:28:31,335 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-09-21 10:28:31,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:31,819 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-09-21 10:28:31,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-09-21 10:28:31,819 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-09-21 10:28:31,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:31,820 INFO L225 Difference]: With dead ends: 102 [2020-09-21 10:28:31,821 INFO L226 Difference]: Without dead ends: 80 [2020-09-21 10:28:31,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:28:31,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-09-21 10:28:31,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-09-21 10:28:31,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-09-21 10:28:31,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-09-21 10:28:31,826 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-09-21 10:28:31,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:31,827 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-09-21 10:28:31,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-21 10:28:31,827 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-09-21 10:28:31,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-09-21 10:28:31,829 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:31,830 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:31,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-09-21 10:28:31,830 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:31,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:31,830 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-09-21 10:28:31,831 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:31,831 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [72162050] [2020-09-21 10:28:31,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:31,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:31,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:31,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:31,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:31,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:33,535 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:33,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [72162050] [2020-09-21 10:28:33,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:33,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-09-21 10:28:33,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593664223] [2020-09-21 10:28:33,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-09-21 10:28:33,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:33,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-09-21 10:28:33,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:28:33,537 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-09-21 10:28:33,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:33,890 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-09-21 10:28:33,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-09-21 10:28:33,890 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-09-21 10:28:33,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:33,891 INFO L225 Difference]: With dead ends: 104 [2020-09-21 10:28:33,892 INFO L226 Difference]: Without dead ends: 82 [2020-09-21 10:28:33,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:28:33,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-09-21 10:28:33,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-09-21 10:28:33,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-09-21 10:28:33,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-09-21 10:28:33,898 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-09-21 10:28:33,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:33,899 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-09-21 10:28:33,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-09-21 10:28:33,899 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-09-21 10:28:33,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-09-21 10:28:33,899 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:33,899 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:33,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-09-21 10:28:33,900 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:33,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:33,900 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-09-21 10:28:33,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:33,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1527327088] [2020-09-21 10:28:33,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:33,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:34,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:34,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:34,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:34,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:35,880 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:35,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1527327088] [2020-09-21 10:28:35,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:35,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-09-21 10:28:35,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90411476] [2020-09-21 10:28:35,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-09-21 10:28:35,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:35,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-09-21 10:28:35,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:28:35,885 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-09-21 10:28:36,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:36,299 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-09-21 10:28:36,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-09-21 10:28:36,300 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-09-21 10:28:36,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:36,301 INFO L225 Difference]: With dead ends: 106 [2020-09-21 10:28:36,301 INFO L226 Difference]: Without dead ends: 84 [2020-09-21 10:28:36,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:28:36,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-09-21 10:28:36,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-09-21 10:28:36,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-09-21 10:28:36,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-09-21 10:28:36,311 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-09-21 10:28:36,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:36,311 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-09-21 10:28:36,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-09-21 10:28:36,311 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-09-21 10:28:36,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-09-21 10:28:36,312 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:36,312 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:36,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-09-21 10:28:36,313 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:36,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:36,313 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-09-21 10:28:36,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:36,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1217227703] [2020-09-21 10:28:36,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:36,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:36,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:36,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:36,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:36,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:38,070 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:38,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1217227703] [2020-09-21 10:28:38,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:38,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-09-21 10:28:38,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348352540] [2020-09-21 10:28:38,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-09-21 10:28:38,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:38,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-09-21 10:28:38,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:28:38,072 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-09-21 10:28:38,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:38,572 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-09-21 10:28:38,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-09-21 10:28:38,572 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-09-21 10:28:38,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:38,573 INFO L225 Difference]: With dead ends: 108 [2020-09-21 10:28:38,573 INFO L226 Difference]: Without dead ends: 86 [2020-09-21 10:28:38,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:28:38,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-09-21 10:28:38,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-09-21 10:28:38,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-09-21 10:28:38,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-09-21 10:28:38,577 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-09-21 10:28:38,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:38,578 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-09-21 10:28:38,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-09-21 10:28:38,578 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-09-21 10:28:38,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-09-21 10:28:38,578 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:38,578 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:38,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-09-21 10:28:38,579 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:38,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:38,579 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-09-21 10:28:38,579 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:38,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1096476542] [2020-09-21 10:28:38,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:38,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:38,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:38,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:38,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:38,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:40,358 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:40,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1096476542] [2020-09-21 10:28:40,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:40,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-09-21 10:28:40,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932423979] [2020-09-21 10:28:40,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-09-21 10:28:40,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:40,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-09-21 10:28:40,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:28:40,360 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-09-21 10:28:40,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:40,874 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-09-21 10:28:40,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-09-21 10:28:40,875 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-09-21 10:28:40,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:40,876 INFO L225 Difference]: With dead ends: 110 [2020-09-21 10:28:40,876 INFO L226 Difference]: Without dead ends: 88 [2020-09-21 10:28:40,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:28:40,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-09-21 10:28:40,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-09-21 10:28:40,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-09-21 10:28:40,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-09-21 10:28:40,882 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-09-21 10:28:40,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:40,883 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-09-21 10:28:40,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-09-21 10:28:40,883 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-09-21 10:28:40,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-09-21 10:28:40,884 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:40,884 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:40,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-09-21 10:28:40,884 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:40,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:40,885 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-09-21 10:28:40,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:40,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1121781766] [2020-09-21 10:28:40,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:40,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:40,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:40,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:41,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:41,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:42,863 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:42,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1121781766] [2020-09-21 10:28:42,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:42,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-09-21 10:28:42,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981071330] [2020-09-21 10:28:42,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-09-21 10:28:42,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:42,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-09-21 10:28:42,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:28:42,865 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-09-21 10:28:43,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:43,389 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-09-21 10:28:43,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-09-21 10:28:43,389 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-09-21 10:28:43,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:43,391 INFO L225 Difference]: With dead ends: 112 [2020-09-21 10:28:43,391 INFO L226 Difference]: Without dead ends: 90 [2020-09-21 10:28:43,392 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:28:43,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-09-21 10:28:43,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-09-21 10:28:43,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-09-21 10:28:43,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-09-21 10:28:43,398 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-09-21 10:28:43,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:43,399 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-09-21 10:28:43,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-09-21 10:28:43,399 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-09-21 10:28:43,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-09-21 10:28:43,400 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:43,400 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:43,400 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-09-21 10:28:43,400 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:43,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:43,400 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-09-21 10:28:43,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:43,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [702791222] [2020-09-21 10:28:43,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:43,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:43,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:43,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:43,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:43,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:45,487 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:45,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [702791222] [2020-09-21 10:28:45,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:45,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-09-21 10:28:45,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568494182] [2020-09-21 10:28:45,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-09-21 10:28:45,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:45,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-09-21 10:28:45,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:28:45,489 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-09-21 10:28:46,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:46,006 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-09-21 10:28:46,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-09-21 10:28:46,007 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-09-21 10:28:46,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:46,008 INFO L225 Difference]: With dead ends: 114 [2020-09-21 10:28:46,008 INFO L226 Difference]: Without dead ends: 92 [2020-09-21 10:28:46,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:28:46,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-09-21 10:28:46,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-09-21 10:28:46,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-09-21 10:28:46,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-09-21 10:28:46,016 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-09-21 10:28:46,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:46,016 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-09-21 10:28:46,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-09-21 10:28:46,016 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-09-21 10:28:46,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-09-21 10:28:46,018 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:46,018 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:46,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-09-21 10:28:46,019 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:46,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:46,019 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-09-21 10:28:46,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:46,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19509231] [2020-09-21 10:28:46,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:46,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:46,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:46,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:46,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:46,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:48,311 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:48,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19509231] [2020-09-21 10:28:48,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:48,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-09-21 10:28:48,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908807782] [2020-09-21 10:28:48,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-09-21 10:28:48,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:48,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-09-21 10:28:48,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:28:48,313 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-09-21 10:28:48,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:48,747 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-09-21 10:28:48,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-09-21 10:28:48,748 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-09-21 10:28:48,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:48,749 INFO L225 Difference]: With dead ends: 116 [2020-09-21 10:28:48,749 INFO L226 Difference]: Without dead ends: 94 [2020-09-21 10:28:48,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-09-21 10:28:48,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-09-21 10:28:48,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-09-21 10:28:48,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-09-21 10:28:48,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-09-21 10:28:48,761 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-09-21 10:28:48,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:48,761 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-09-21 10:28:48,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-09-21 10:28:48,761 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-09-21 10:28:48,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-09-21 10:28:48,762 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:48,762 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:48,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-09-21 10:28:48,763 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:48,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:48,763 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-09-21 10:28:48,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:48,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242523519] [2020-09-21 10:28:48,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:48,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:48,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:48,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:48,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:48,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:51,138 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:51,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242523519] [2020-09-21 10:28:51,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:51,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-09-21 10:28:51,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86961205] [2020-09-21 10:28:51,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-09-21 10:28:51,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:51,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-09-21 10:28:51,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:28:51,140 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-09-21 10:28:51,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:51,733 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-09-21 10:28:51,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-09-21 10:28:51,734 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-09-21 10:28:51,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:51,735 INFO L225 Difference]: With dead ends: 118 [2020-09-21 10:28:51,735 INFO L226 Difference]: Without dead ends: 96 [2020-09-21 10:28:51,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-09-21 10:28:51,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-09-21 10:28:51,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-09-21 10:28:51,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-09-21 10:28:51,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-09-21 10:28:51,741 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-09-21 10:28:51,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:51,742 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-09-21 10:28:51,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-09-21 10:28:51,746 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-09-21 10:28:51,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-09-21 10:28:51,747 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:51,747 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:51,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-09-21 10:28:51,747 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:51,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:51,748 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-09-21 10:28:51,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:51,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653114970] [2020-09-21 10:28:51,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:51,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:51,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:51,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:51,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:51,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:54,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:54,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653114970] [2020-09-21 10:28:54,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:54,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-09-21 10:28:54,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610513742] [2020-09-21 10:28:54,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-09-21 10:28:54,251 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:54,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-09-21 10:28:54,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:28:54,252 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-09-21 10:28:54,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:54,746 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-09-21 10:28:54,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-09-21 10:28:54,747 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-09-21 10:28:54,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:54,748 INFO L225 Difference]: With dead ends: 120 [2020-09-21 10:28:54,748 INFO L226 Difference]: Without dead ends: 98 [2020-09-21 10:28:54,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-09-21 10:28:54,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-09-21 10:28:54,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-09-21 10:28:54,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-09-21 10:28:54,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-09-21 10:28:54,755 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-09-21 10:28:54,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:54,755 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-09-21 10:28:54,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-09-21 10:28:54,756 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-09-21 10:28:54,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-09-21 10:28:54,757 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:54,757 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:54,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-09-21 10:28:54,757 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:54,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:54,758 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-09-21 10:28:54,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:54,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2064374536] [2020-09-21 10:28:54,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:54,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:54,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:54,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:54,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:54,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat