/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 15:51:21,994 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 15:51:22,042 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:51:22,051 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:51:22,054 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:51:22,058 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:51:22,061 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:51:22,064 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:51:22,066 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:51:22,067 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:51:22,067 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:51:22,070 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:51:22,073 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:51:22,074 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:51:22,076 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:51:22,077 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:51:22,079 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:51:22,088 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:51:22,090 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:51:22,094 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:51:22,094 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:51:22,095 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:51:22,097 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 15:51:22,104 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:51:22,105 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:51:22,106 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:51:22,107 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 15:51:22,128 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:51:22,128 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:51:22,130 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:51:22,131 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:51:22,131 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:51:22,131 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:51:22,131 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:51:22,131 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:51:22,131 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:51:22,132 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:51:22,132 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:51:22,132 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:51:22,132 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:51:22,132 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:51:22,132 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:51:22,133 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:51:22,133 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:51:22,133 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:51:22,133 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:51:22,133 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:51:22,134 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:51:22,139 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:51:22,139 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:51:22,140 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:51:22,140 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:51:22,140 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:51:22,140 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:51:22,140 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:51:22,140 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:51:22,141 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 15:51:22,492 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:51:22,505 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:51:22,509 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:51:22,510 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:51:22,511 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:51:22,511 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 15:51:22,573 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/37aadd28a/cb56ada27771493c8002397c59b54ea0/FLAGabc9245b8 [2020-08-21 15:51:23,081 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:51:23,081 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 15:51:23,097 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/37aadd28a/cb56ada27771493c8002397c59b54ea0/FLAGabc9245b8 [2020-08-21 15:51:23,457 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/37aadd28a/cb56ada27771493c8002397c59b54ea0 [2020-08-21 15:51:23,467 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:51:23,469 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:51:23,470 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:51:23,470 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:51:23,474 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:51:23,475 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:51:23" (1/1) ... [2020-08-21 15:51:23,478 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4076c4d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:23, skipping insertion in model container [2020-08-21 15:51:23,479 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:51:23" (1/1) ... [2020-08-21 15:51:23,489 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:51:23,508 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:51:23,706 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:51:23,710 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:51:23,722 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:51:23,734 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:51:23,734 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:23 WrapperNode [2020-08-21 15:51:23,734 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:51:23,735 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:51:23,735 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:51:23,735 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:51:23,745 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:23" (1/1) ... [2020-08-21 15:51:23,746 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:23" (1/1) ... [2020-08-21 15:51:23,838 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:23" (1/1) ... [2020-08-21 15:51:23,839 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:23" (1/1) ... [2020-08-21 15:51:23,843 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:23" (1/1) ... [2020-08-21 15:51:23,850 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:23" (1/1) ... [2020-08-21 15:51:23,851 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:23" (1/1) ... [2020-08-21 15:51:23,852 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:51:23,853 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:51:23,853 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:51:23,853 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:51:23,854 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:23" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:51:23,917 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:51:23,917 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:51:23,917 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 15:51:23,917 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:51:23,918 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:51:23,918 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 15:51:23,918 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:51:23,918 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:51:23,918 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:51:24,085 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:51:24,085 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 15:51:24,088 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:51:24 BoogieIcfgContainer [2020-08-21 15:51:24,088 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:51:24,089 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:51:24,089 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:51:24,092 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:51:24,093 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:51:23" (1/3) ... [2020-08-21 15:51:24,093 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15515549 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:51:24, skipping insertion in model container [2020-08-21 15:51:24,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:51:23" (2/3) ... [2020-08-21 15:51:24,094 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15515549 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:51:24, skipping insertion in model container [2020-08-21 15:51:24,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:51:24" (3/3) ... [2020-08-21 15:51:24,096 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-21 15:51:24,107 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:51:24,115 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:51:24,129 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:51:24,155 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:51:24,155 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:51:24,155 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:51:24,155 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:51:24,156 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:51:24,156 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:51:24,156 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:51:24,156 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:51:24,174 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 15:51:24,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 15:51:24,180 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:24,181 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:24,181 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:24,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:24,186 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 15:51:24,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:24,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [821864537] [2020-08-21 15:51:24,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:24,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:24,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:24,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:24,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:24,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [821864537] [2020-08-21 15:51:24,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:51:24,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 15:51:24,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019419585] [2020-08-21 15:51:24,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 15:51:24,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:24,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 15:51:24,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 15:51:24,473 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 15:51:24,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:24,518 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 15:51:24,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 15:51:24,520 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 15:51:24,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:24,527 INFO L225 Difference]: With dead ends: 29 [2020-08-21 15:51:24,528 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 15:51:24,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 15:51:24,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 15:51:24,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 15:51:24,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 15:51:24,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 15:51:24,566 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 15:51:24,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:24,567 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 15:51:24,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 15:51:24,567 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 15:51:24,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 15:51:24,568 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:24,568 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:24,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:51:24,569 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:24,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:24,569 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 15:51:24,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:24,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1782258246] [2020-08-21 15:51:24,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:24,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:24,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:24,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:24,659 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:24,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1782258246] [2020-08-21 15:51:24,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:24,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 15:51:24,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102828360] [2020-08-21 15:51:24,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:51:24,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:24,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:51:24,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:51:24,663 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 15:51:24,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:24,693 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 15:51:24,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 15:51:24,694 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 15:51:24,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:24,695 INFO L225 Difference]: With dead ends: 18 [2020-08-21 15:51:24,695 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 15:51:24,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:51:24,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 15:51:24,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 15:51:24,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 15:51:24,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 15:51:24,702 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 15:51:24,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:24,702 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 15:51:24,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:51:24,702 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 15:51:24,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 15:51:24,703 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:24,703 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:24,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:51:24,704 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:24,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:24,704 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 15:51:24,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:24,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284867849] [2020-08-21 15:51:24,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:24,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:24,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:24,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:24,816 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:24,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284867849] [2020-08-21 15:51:24,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:24,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 15:51:24,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571528419] [2020-08-21 15:51:24,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:51:24,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:24,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:51:24,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:51:24,819 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 15:51:24,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:24,844 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 15:51:24,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:51:24,845 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 15:51:24,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:24,846 INFO L225 Difference]: With dead ends: 19 [2020-08-21 15:51:24,846 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 15:51:24,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:51:24,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 15:51:24,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 15:51:24,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 15:51:24,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 15:51:24,852 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 15:51:24,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:24,853 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 15:51:24,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:51:24,853 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 15:51:24,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 15:51:24,854 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:24,854 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:24,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:51:24,855 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:24,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:24,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 15:51:24,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:24,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1710961384] [2020-08-21 15:51:24,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:24,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:24,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:24,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:24,976 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:24,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1710961384] [2020-08-21 15:51:24,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:24,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 15:51:24,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468526862] [2020-08-21 15:51:24,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:51:24,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:24,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:51:24,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:51:24,979 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 15:51:25,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:25,009 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 15:51:25,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:51:25,009 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 15:51:25,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:25,010 INFO L225 Difference]: With dead ends: 20 [2020-08-21 15:51:25,010 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 15:51:25,011 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:51:25,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 15:51:25,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 15:51:25,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 15:51:25,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 15:51:25,017 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 15:51:25,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:25,017 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 15:51:25,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:51:25,018 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 15:51:25,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 15:51:25,018 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:25,019 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:25,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 15:51:25,019 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:25,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:25,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 15:51:25,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:25,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18087122] [2020-08-21 15:51:25,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:25,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:25,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:25,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:25,144 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:25,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18087122] [2020-08-21 15:51:25,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:25,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:51:25,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778782303] [2020-08-21 15:51:25,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:51:25,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:25,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:51:25,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:51:25,147 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 15:51:25,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:25,186 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 15:51:25,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:51:25,187 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 15:51:25,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:25,188 INFO L225 Difference]: With dead ends: 21 [2020-08-21 15:51:25,188 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 15:51:25,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:51:25,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 15:51:25,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 15:51:25,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 15:51:25,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 15:51:25,195 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 15:51:25,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:25,196 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 15:51:25,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:51:25,196 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 15:51:25,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 15:51:25,197 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:25,197 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:25,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 15:51:25,198 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:25,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:25,198 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 15:51:25,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:25,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1875956848] [2020-08-21 15:51:25,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:25,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:25,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:25,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:25,405 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:25,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1875956848] [2020-08-21 15:51:25,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:25,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 15:51:25,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599075518] [2020-08-21 15:51:25,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 15:51:25,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:25,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 15:51:25,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:51:25,408 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 15:51:25,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:25,455 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 15:51:25,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 15:51:25,456 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 15:51:25,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:25,457 INFO L225 Difference]: With dead ends: 22 [2020-08-21 15:51:25,457 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 15:51:25,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:51:25,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 15:51:25,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 15:51:25,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 15:51:25,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 15:51:25,463 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 15:51:25,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:25,464 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 15:51:25,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 15:51:25,464 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 15:51:25,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 15:51:25,465 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:25,465 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:25,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 15:51:25,465 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:25,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:25,466 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 15:51:25,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:25,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1896469064] [2020-08-21 15:51:25,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:25,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:25,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:25,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:25,616 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:25,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1896469064] [2020-08-21 15:51:25,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:25,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 15:51:25,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115221058] [2020-08-21 15:51:25,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 15:51:25,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:25,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 15:51:25,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:51:25,621 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 15:51:25,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:25,683 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 15:51:25,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 15:51:25,683 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 15:51:25,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:25,684 INFO L225 Difference]: With dead ends: 23 [2020-08-21 15:51:25,684 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 15:51:25,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:51:25,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 15:51:25,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 15:51:25,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 15:51:25,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 15:51:25,690 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 15:51:25,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:25,691 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 15:51:25,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 15:51:25,691 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 15:51:25,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 15:51:25,692 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:25,692 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:25,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 15:51:25,693 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:25,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:25,693 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 15:51:25,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:25,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34639919] [2020-08-21 15:51:25,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:25,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:25,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:25,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:25,832 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:25,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34639919] [2020-08-21 15:51:25,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:25,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 15:51:25,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498994394] [2020-08-21 15:51:25,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 15:51:25,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:25,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 15:51:25,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:51:25,835 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 15:51:25,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:25,892 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 15:51:25,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 15:51:25,893 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 15:51:25,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:25,894 INFO L225 Difference]: With dead ends: 24 [2020-08-21 15:51:25,894 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 15:51:25,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:51:25,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 15:51:25,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 15:51:25,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 15:51:25,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 15:51:25,900 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 15:51:25,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:25,901 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 15:51:25,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 15:51:25,901 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 15:51:25,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 15:51:25,902 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:25,902 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:25,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 15:51:25,902 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:25,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:25,903 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 15:51:25,903 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:25,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31548288] [2020-08-21 15:51:25,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:25,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:26,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:26,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:26,061 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:26,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31548288] [2020-08-21 15:51:26,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:26,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 15:51:26,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831270838] [2020-08-21 15:51:26,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 15:51:26,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:26,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 15:51:26,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:51:26,064 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 15:51:26,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:26,153 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 15:51:26,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 15:51:26,154 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 15:51:26,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:26,154 INFO L225 Difference]: With dead ends: 25 [2020-08-21 15:51:26,155 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 15:51:26,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:51:26,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 15:51:26,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 15:51:26,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 15:51:26,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 15:51:26,161 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 15:51:26,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:26,161 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 15:51:26,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 15:51:26,162 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 15:51:26,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 15:51:26,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:26,163 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:26,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 15:51:26,163 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:26,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:26,163 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 15:51:26,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:26,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1601567013] [2020-08-21 15:51:26,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:26,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:26,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:26,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:26,369 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:26,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1601567013] [2020-08-21 15:51:26,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:26,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 15:51:26,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455825143] [2020-08-21 15:51:26,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 15:51:26,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:26,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 15:51:26,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:51:26,373 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 15:51:26,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:26,458 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 15:51:26,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 15:51:26,458 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 15:51:26,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:26,459 INFO L225 Difference]: With dead ends: 26 [2020-08-21 15:51:26,459 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 15:51:26,460 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:51:26,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 15:51:26,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 15:51:26,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 15:51:26,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 15:51:26,466 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 15:51:26,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:26,466 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 15:51:26,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 15:51:26,467 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 15:51:26,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 15:51:26,467 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:26,468 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:26,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 15:51:26,468 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:26,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:26,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 15:51:26,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:26,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [789865781] [2020-08-21 15:51:26,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:26,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:26,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:26,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:26,663 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:26,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [789865781] [2020-08-21 15:51:26,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:26,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 15:51:26,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731456311] [2020-08-21 15:51:26,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 15:51:26,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:26,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 15:51:26,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:51:26,666 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 15:51:26,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:26,760 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 15:51:26,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 15:51:26,760 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 15:51:26,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:26,761 INFO L225 Difference]: With dead ends: 27 [2020-08-21 15:51:26,761 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 15:51:26,762 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:51:26,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 15:51:26,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 15:51:26,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 15:51:26,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 15:51:26,767 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 15:51:26,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:26,767 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 15:51:26,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 15:51:26,767 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 15:51:26,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 15:51:26,768 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:26,768 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:26,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 15:51:26,769 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:26,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:26,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 15:51:26,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:26,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1378194342] [2020-08-21 15:51:26,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:26,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:26,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:26,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:26,955 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:26,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1378194342] [2020-08-21 15:51:26,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:26,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 15:51:26,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046102945] [2020-08-21 15:51:26,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 15:51:26,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:26,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 15:51:26,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:51:26,957 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 15:51:27,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:27,055 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 15:51:27,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 15:51:27,056 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 15:51:27,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:27,057 INFO L225 Difference]: With dead ends: 28 [2020-08-21 15:51:27,057 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 15:51:27,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:51:27,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 15:51:27,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 15:51:27,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 15:51:27,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 15:51:27,062 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 15:51:27,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:27,063 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 15:51:27,063 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 15:51:27,063 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 15:51:27,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 15:51:27,063 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:27,064 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:27,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 15:51:27,064 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:27,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:27,064 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 15:51:27,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:27,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1570346827] [2020-08-21 15:51:27,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:27,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:27,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:27,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:27,281 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:27,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1570346827] [2020-08-21 15:51:27,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:27,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 15:51:27,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017866984] [2020-08-21 15:51:27,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 15:51:27,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:27,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 15:51:27,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:51:27,284 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 15:51:27,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:27,414 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 15:51:27,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 15:51:27,415 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 15:51:27,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:27,415 INFO L225 Difference]: With dead ends: 29 [2020-08-21 15:51:27,416 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 15:51:27,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:51:27,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 15:51:27,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 15:51:27,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 15:51:27,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 15:51:27,421 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 15:51:27,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:27,421 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 15:51:27,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 15:51:27,422 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 15:51:27,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 15:51:27,422 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:27,423 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:27,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 15:51:27,423 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:27,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:27,424 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 15:51:27,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:27,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592016852] [2020-08-21 15:51:27,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:27,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:27,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:27,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:27,652 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:27,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592016852] [2020-08-21 15:51:27,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:27,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 15:51:27,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257726735] [2020-08-21 15:51:27,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 15:51:27,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:27,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 15:51:27,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:51:27,654 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 15:51:27,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:27,804 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 15:51:27,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 15:51:27,805 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 15:51:27,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:27,806 INFO L225 Difference]: With dead ends: 30 [2020-08-21 15:51:27,806 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 15:51:27,807 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:51:27,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 15:51:27,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 15:51:27,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 15:51:27,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 15:51:27,816 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 15:51:27,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:27,816 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 15:51:27,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 15:51:27,817 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 15:51:27,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 15:51:27,819 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:27,821 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:27,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 15:51:27,821 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:27,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:27,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 15:51:27,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:27,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920114776] [2020-08-21 15:51:27,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:27,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:28,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:28,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:28,098 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:28,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920114776] [2020-08-21 15:51:28,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:28,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 15:51:28,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927998798] [2020-08-21 15:51:28,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 15:51:28,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:28,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 15:51:28,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 15:51:28,101 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 15:51:28,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:28,268 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 15:51:28,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 15:51:28,269 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 15:51:28,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:28,269 INFO L225 Difference]: With dead ends: 31 [2020-08-21 15:51:28,270 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 15:51:28,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 15:51:28,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 15:51:28,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 15:51:28,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 15:51:28,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 15:51:28,278 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 15:51:28,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:28,280 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 15:51:28,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 15:51:28,280 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 15:51:28,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 15:51:28,283 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:28,283 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:28,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 15:51:28,283 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:28,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:28,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 15:51:28,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:28,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103878864] [2020-08-21 15:51:28,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:28,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:28,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:28,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:28,573 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:28,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103878864] [2020-08-21 15:51:28,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:28,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 15:51:28,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083625503] [2020-08-21 15:51:28,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 15:51:28,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:28,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 15:51:28,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:51:28,579 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 15:51:28,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:28,748 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 15:51:28,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 15:51:28,749 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 15:51:28,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:28,750 INFO L225 Difference]: With dead ends: 32 [2020-08-21 15:51:28,750 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 15:51:28,751 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:51:28,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 15:51:28,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 15:51:28,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 15:51:28,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 15:51:28,756 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 15:51:28,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:28,756 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 15:51:28,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 15:51:28,756 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 15:51:28,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 15:51:28,757 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:28,757 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:28,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 15:51:28,758 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:28,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:28,758 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 15:51:28,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:28,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1290514649] [2020-08-21 15:51:28,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:28,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:29,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:29,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:29,061 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:29,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1290514649] [2020-08-21 15:51:29,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:29,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 15:51:29,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338107859] [2020-08-21 15:51:29,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 15:51:29,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:29,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 15:51:29,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:51:29,064 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 15:51:29,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:29,247 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 15:51:29,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 15:51:29,248 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 15:51:29,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:29,249 INFO L225 Difference]: With dead ends: 33 [2020-08-21 15:51:29,249 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 15:51:29,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:51:29,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 15:51:29,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 15:51:29,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 15:51:29,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 15:51:29,258 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 15:51:29,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:29,258 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 15:51:29,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 15:51:29,258 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 15:51:29,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 15:51:29,259 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:29,259 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:29,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 15:51:29,259 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:29,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:29,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 15:51:29,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:29,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107151849] [2020-08-21 15:51:29,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:29,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:29,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:29,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:29,592 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:29,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107151849] [2020-08-21 15:51:29,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:29,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 15:51:29,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371249047] [2020-08-21 15:51:29,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 15:51:29,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:29,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 15:51:29,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 15:51:29,596 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 15:51:29,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:29,799 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 15:51:29,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 15:51:29,800 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 15:51:29,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:29,801 INFO L225 Difference]: With dead ends: 34 [2020-08-21 15:51:29,801 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 15:51:29,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 15:51:29,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 15:51:29,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 15:51:29,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 15:51:29,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 15:51:29,806 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 15:51:29,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:29,807 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 15:51:29,807 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 15:51:29,807 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 15:51:29,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 15:51:29,807 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:29,808 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:29,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 15:51:29,808 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:29,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:29,808 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 15:51:29,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:29,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38010422] [2020-08-21 15:51:29,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:29,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:30,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:30,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:30,148 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:30,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38010422] [2020-08-21 15:51:30,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:30,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 15:51:30,149 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639811164] [2020-08-21 15:51:30,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 15:51:30,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:30,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 15:51:30,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:51:30,150 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 15:51:30,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:30,386 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 15:51:30,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 15:51:30,387 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 15:51:30,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:30,388 INFO L225 Difference]: With dead ends: 35 [2020-08-21 15:51:30,388 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 15:51:30,388 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:51:30,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 15:51:30,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 15:51:30,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 15:51:30,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 15:51:30,393 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 15:51:30,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:30,394 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 15:51:30,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 15:51:30,394 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 15:51:30,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 15:51:30,395 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:30,395 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:30,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 15:51:30,395 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:30,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:30,396 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 15:51:30,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:30,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940185698] [2020-08-21 15:51:30,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:30,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:30,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:30,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:30,767 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:30,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940185698] [2020-08-21 15:51:30,768 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:30,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 15:51:30,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493890939] [2020-08-21 15:51:30,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 15:51:30,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:30,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 15:51:30,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 15:51:30,770 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 15:51:31,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:31,053 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 15:51:31,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 15:51:31,053 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 15:51:31,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:31,054 INFO L225 Difference]: With dead ends: 36 [2020-08-21 15:51:31,054 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 15:51:31,055 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 15:51:31,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 15:51:31,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 15:51:31,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 15:51:31,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 15:51:31,060 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 15:51:31,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:31,061 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 15:51:31,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 15:51:31,061 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 15:51:31,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 15:51:31,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:31,062 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:31,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 15:51:31,062 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:31,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:31,062 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 15:51:31,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:31,063 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [668119170] [2020-08-21 15:51:31,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:31,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:31,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:31,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:31,482 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:31,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [668119170] [2020-08-21 15:51:31,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:31,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 15:51:31,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730876110] [2020-08-21 15:51:31,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 15:51:31,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:31,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 15:51:31,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 15:51:31,485 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 15:51:31,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:31,787 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 15:51:31,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 15:51:31,787 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 15:51:31,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:31,788 INFO L225 Difference]: With dead ends: 37 [2020-08-21 15:51:31,788 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 15:51:31,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 15:51:31,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 15:51:31,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 15:51:31,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 15:51:31,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 15:51:31,794 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 15:51:31,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:31,794 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 15:51:31,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 15:51:31,794 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 15:51:31,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 15:51:31,795 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:31,795 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:31,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 15:51:31,795 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:31,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:31,796 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 15:51:31,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:31,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465494931] [2020-08-21 15:51:31,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:31,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:32,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:32,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:32,229 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:32,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465494931] [2020-08-21 15:51:32,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:32,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 15:51:32,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505953671] [2020-08-21 15:51:32,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 15:51:32,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:32,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 15:51:32,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:51:32,231 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 15:51:32,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:32,553 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 15:51:32,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 15:51:32,556 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 15:51:32,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:32,556 INFO L225 Difference]: With dead ends: 38 [2020-08-21 15:51:32,556 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 15:51:32,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:51:32,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 15:51:32,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 15:51:32,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 15:51:32,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 15:51:32,561 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 15:51:32,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:32,562 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 15:51:32,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 15:51:32,562 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 15:51:32,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 15:51:32,562 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:32,562 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:32,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 15:51:32,563 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:32,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:32,563 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 15:51:32,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:32,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2007268742] [2020-08-21 15:51:32,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:32,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:33,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:33,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:33,094 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:33,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2007268742] [2020-08-21 15:51:33,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:33,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 15:51:33,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836860973] [2020-08-21 15:51:33,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 15:51:33,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:33,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 15:51:33,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 15:51:33,102 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 15:51:33,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:33,441 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 15:51:33,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 15:51:33,442 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 15:51:33,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:33,442 INFO L225 Difference]: With dead ends: 39 [2020-08-21 15:51:33,442 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 15:51:33,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 15:51:33,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 15:51:33,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 15:51:33,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 15:51:33,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 15:51:33,449 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 15:51:33,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:33,449 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 15:51:33,449 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 15:51:33,449 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 15:51:33,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 15:51:33,450 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:33,450 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:33,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 15:51:33,450 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:33,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:33,451 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 15:51:33,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:33,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126147608] [2020-08-21 15:51:33,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:33,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:33,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:33,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:33,944 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:33,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126147608] [2020-08-21 15:51:33,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:33,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 15:51:33,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549179261] [2020-08-21 15:51:33,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 15:51:33,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:33,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 15:51:33,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 15:51:33,946 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 15:51:34,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:34,329 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 15:51:34,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 15:51:34,329 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 15:51:34,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:34,330 INFO L225 Difference]: With dead ends: 40 [2020-08-21 15:51:34,330 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 15:51:34,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 15:51:34,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 15:51:34,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 15:51:34,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 15:51:34,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 15:51:34,336 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 15:51:34,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:34,336 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 15:51:34,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 15:51:34,336 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 15:51:34,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 15:51:34,336 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:34,337 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:34,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 15:51:34,337 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:34,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:34,337 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 15:51:34,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:34,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [108937740] [2020-08-21 15:51:34,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:34,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:34,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:34,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:34,984 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:34,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [108937740] [2020-08-21 15:51:34,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:34,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 15:51:34,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391393267] [2020-08-21 15:51:34,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 15:51:34,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:34,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 15:51:34,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 15:51:34,986 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 15:51:35,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:35,387 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 15:51:35,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 15:51:35,387 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 15:51:35,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:35,388 INFO L225 Difference]: With dead ends: 41 [2020-08-21 15:51:35,388 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 15:51:35,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 15:51:35,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 15:51:35,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 15:51:35,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 15:51:35,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 15:51:35,393 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 15:51:35,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:35,393 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 15:51:35,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 15:51:35,393 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 15:51:35,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 15:51:35,394 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:35,394 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:35,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 15:51:35,394 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:35,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:35,395 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 15:51:35,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:35,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [792381988] [2020-08-21 15:51:35,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:35,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:35,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:35,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:35,955 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:35,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [792381988] [2020-08-21 15:51:35,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:35,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 15:51:35,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144081597] [2020-08-21 15:51:35,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 15:51:35,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:35,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 15:51:35,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 15:51:35,957 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 15:51:36,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:36,406 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 15:51:36,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 15:51:36,407 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 15:51:36,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:36,407 INFO L225 Difference]: With dead ends: 42 [2020-08-21 15:51:36,408 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 15:51:36,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 15:51:36,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 15:51:36,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 15:51:36,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 15:51:36,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 15:51:36,412 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 15:51:36,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:36,413 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 15:51:36,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 15:51:36,413 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 15:51:36,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 15:51:36,413 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:36,413 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:36,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 15:51:36,414 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:36,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:36,414 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 15:51:36,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:36,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [935712304] [2020-08-21 15:51:36,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:36,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:37,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:37,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:37,007 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:37,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [935712304] [2020-08-21 15:51:37,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:37,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 15:51:37,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165433774] [2020-08-21 15:51:37,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 15:51:37,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:37,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 15:51:37,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 15:51:37,009 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 15:51:37,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:37,478 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 15:51:37,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 15:51:37,479 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 15:51:37,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:37,479 INFO L225 Difference]: With dead ends: 43 [2020-08-21 15:51:37,479 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 15:51:37,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 15:51:37,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 15:51:37,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 15:51:37,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 15:51:37,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 15:51:37,487 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 15:51:37,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:37,488 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 15:51:37,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 15:51:37,488 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 15:51:37,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 15:51:37,490 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:37,490 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:37,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 15:51:37,491 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:37,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:37,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 15:51:37,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:37,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1245332723] [2020-08-21 15:51:37,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:37,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:38,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:38,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:38,128 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:38,128 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1245332723] [2020-08-21 15:51:38,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:38,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 15:51:38,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325813815] [2020-08-21 15:51:38,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 15:51:38,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:38,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 15:51:38,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 15:51:38,130 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 15:51:38,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:38,627 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 15:51:38,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 15:51:38,627 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 15:51:38,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:38,628 INFO L225 Difference]: With dead ends: 44 [2020-08-21 15:51:38,628 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 15:51:38,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 15:51:38,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 15:51:38,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 15:51:38,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 15:51:38,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 15:51:38,633 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 15:51:38,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:38,634 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 15:51:38,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 15:51:38,634 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 15:51:38,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 15:51:38,635 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:38,636 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:38,636 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 15:51:38,638 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:38,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:38,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 15:51:38,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:38,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1281146021] [2020-08-21 15:51:38,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:38,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:39,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:39,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:39,336 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:39,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1281146021] [2020-08-21 15:51:39,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:39,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 15:51:39,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182886617] [2020-08-21 15:51:39,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 15:51:39,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:39,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 15:51:39,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 15:51:39,339 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 15:51:39,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:39,803 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 15:51:39,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 15:51:39,803 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 15:51:39,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:39,804 INFO L225 Difference]: With dead ends: 45 [2020-08-21 15:51:39,804 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 15:51:39,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 15:51:39,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 15:51:39,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 15:51:39,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 15:51:39,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 15:51:39,810 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 15:51:39,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:39,810 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 15:51:39,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 15:51:39,810 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 15:51:39,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 15:51:39,811 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:39,811 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:39,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 15:51:39,811 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:39,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:39,812 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 15:51:39,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:39,812 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2135030558] [2020-08-21 15:51:39,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:39,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:40,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:40,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:40,527 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:40,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2135030558] [2020-08-21 15:51:40,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:40,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 15:51:40,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893719766] [2020-08-21 15:51:40,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 15:51:40,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:40,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 15:51:40,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 15:51:40,529 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 15:51:41,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:41,086 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 15:51:41,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 15:51:41,087 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 15:51:41,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:41,088 INFO L225 Difference]: With dead ends: 46 [2020-08-21 15:51:41,088 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 15:51:41,089 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 15:51:41,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 15:51:41,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 15:51:41,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 15:51:41,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 15:51:41,092 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 15:51:41,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:41,093 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 15:51:41,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 15:51:41,093 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 15:51:41,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 15:51:41,093 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:41,094 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:41,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 15:51:41,094 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:41,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:41,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 15:51:41,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:41,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1836806854] [2020-08-21 15:51:41,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:41,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:41,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:41,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:41,884 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:41,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1836806854] [2020-08-21 15:51:41,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:41,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 15:51:41,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431523095] [2020-08-21 15:51:41,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 15:51:41,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:41,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 15:51:41,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 15:51:41,886 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 15:51:42,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:42,466 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 15:51:42,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 15:51:42,468 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 15:51:42,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:42,469 INFO L225 Difference]: With dead ends: 47 [2020-08-21 15:51:42,469 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 15:51:42,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 15:51:42,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 15:51:42,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 15:51:42,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 15:51:42,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 15:51:42,475 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 15:51:42,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:42,476 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 15:51:42,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 15:51:42,476 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 15:51:42,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 15:51:42,477 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:42,477 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:42,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 15:51:42,477 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:42,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:42,479 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 15:51:42,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:42,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691376701] [2020-08-21 15:51:42,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:42,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:43,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:43,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:43,286 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:43,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691376701] [2020-08-21 15:51:43,286 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:43,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 15:51:43,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682512524] [2020-08-21 15:51:43,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 15:51:43,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:43,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 15:51:43,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 15:51:43,288 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 15:51:44,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:44,132 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 15:51:44,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 15:51:44,133 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 15:51:44,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:44,133 INFO L225 Difference]: With dead ends: 48 [2020-08-21 15:51:44,134 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 15:51:44,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 15:51:44,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 15:51:44,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 15:51:44,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 15:51:44,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 15:51:44,148 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 15:51:44,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:44,149 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 15:51:44,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 15:51:44,149 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 15:51:44,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 15:51:44,150 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:44,150 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:44,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 15:51:44,151 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:44,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:44,151 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 15:51:44,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:44,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1306243159] [2020-08-21 15:51:44,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:44,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:45,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:45,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:45,277 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:45,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1306243159] [2020-08-21 15:51:45,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:45,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 15:51:45,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424315658] [2020-08-21 15:51:45,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 15:51:45,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:45,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 15:51:45,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 15:51:45,281 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 15:51:46,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:46,021 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 15:51:46,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 15:51:46,022 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 15:51:46,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:46,022 INFO L225 Difference]: With dead ends: 49 [2020-08-21 15:51:46,023 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 15:51:46,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 15:51:46,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 15:51:46,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 15:51:46,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 15:51:46,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 15:51:46,028 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 15:51:46,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:46,029 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 15:51:46,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 15:51:46,029 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 15:51:46,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 15:51:46,029 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:46,029 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:46,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 15:51:46,030 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:46,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:46,030 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 15:51:46,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:46,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1290148400] [2020-08-21 15:51:46,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:46,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:47,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:47,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:47,118 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:47,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1290148400] [2020-08-21 15:51:47,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:47,119 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 15:51:47,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321758917] [2020-08-21 15:51:47,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 15:51:47,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:47,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 15:51:47,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 15:51:47,122 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 15:51:48,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:48,036 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 15:51:48,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 15:51:48,036 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 15:51:48,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:48,037 INFO L225 Difference]: With dead ends: 50 [2020-08-21 15:51:48,038 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 15:51:48,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 15:51:48,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 15:51:48,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 15:51:48,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 15:51:48,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 15:51:48,048 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 15:51:48,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:48,048 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 15:51:48,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 15:51:48,049 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 15:51:48,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 15:51:48,049 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:48,050 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:48,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 15:51:48,050 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:48,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:48,051 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 15:51:48,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:48,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965294308] [2020-08-21 15:51:48,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:48,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:49,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:49,010 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:49,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965294308] [2020-08-21 15:51:49,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:49,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 15:51:49,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042269871] [2020-08-21 15:51:49,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 15:51:49,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:49,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 15:51:49,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 15:51:49,012 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 15:51:49,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:49,800 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 15:51:49,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 15:51:49,801 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 15:51:49,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:49,802 INFO L225 Difference]: With dead ends: 51 [2020-08-21 15:51:49,802 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 15:51:49,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 15:51:49,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 15:51:49,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 15:51:49,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 15:51:49,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 15:51:49,812 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 15:51:49,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:49,812 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 15:51:49,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 15:51:49,812 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 15:51:49,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 15:51:49,813 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:49,813 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:49,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 15:51:49,813 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:49,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:49,814 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 15:51:49,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:49,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1242232657] [2020-08-21 15:51:49,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:49,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:50,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:50,788 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:50,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1242232657] [2020-08-21 15:51:50,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:50,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 15:51:50,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010989689] [2020-08-21 15:51:50,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 15:51:50,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:50,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 15:51:50,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 15:51:50,789 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 15:51:51,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:51,578 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 15:51:51,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 15:51:51,578 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 15:51:51,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:51,579 INFO L225 Difference]: With dead ends: 52 [2020-08-21 15:51:51,580 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 15:51:51,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 15:51:51,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 15:51:51,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 15:51:51,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 15:51:51,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 15:51:51,586 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 15:51:51,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:51,587 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 15:51:51,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 15:51:51,587 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 15:51:51,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 15:51:51,588 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:51,588 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:51,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 15:51:51,588 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:51,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:51,588 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 15:51:51,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:51,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1770066004] [2020-08-21 15:51:51,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:51,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:52,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:52,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:52,690 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:52,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1770066004] [2020-08-21 15:51:52,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:52,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 15:51:52,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567789612] [2020-08-21 15:51:52,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 15:51:52,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:52,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 15:51:52,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 15:51:52,693 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 15:51:53,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:53,575 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 15:51:53,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 15:51:53,576 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 15:51:53,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:53,577 INFO L225 Difference]: With dead ends: 53 [2020-08-21 15:51:53,577 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 15:51:53,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 15:51:53,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 15:51:53,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 15:51:53,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 15:51:53,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 15:51:53,581 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 15:51:53,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:53,582 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 15:51:53,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 15:51:53,582 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 15:51:53,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 15:51:53,582 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:53,583 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:53,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 15:51:53,583 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:53,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:53,583 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 15:51:53,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:53,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1742466963] [2020-08-21 15:51:53,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:53,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:54,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:54,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:54,739 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:54,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1742466963] [2020-08-21 15:51:54,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:54,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 15:51:54,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445870528] [2020-08-21 15:51:54,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 15:51:54,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:54,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 15:51:54,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 15:51:54,743 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 15:51:55,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:55,656 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 15:51:55,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 15:51:55,656 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 15:51:55,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:55,657 INFO L225 Difference]: With dead ends: 54 [2020-08-21 15:51:55,658 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 15:51:55,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 15:51:55,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 15:51:55,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 15:51:55,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 15:51:55,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 15:51:55,663 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 15:51:55,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:55,663 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 15:51:55,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 15:51:55,664 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 15:51:55,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 15:51:55,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:55,665 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:55,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 15:51:55,665 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:55,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:55,665 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 15:51:55,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:55,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1470202714] [2020-08-21 15:51:55,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:55,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:56,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:56,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:56,835 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:56,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1470202714] [2020-08-21 15:51:56,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:56,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 15:51:56,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559219989] [2020-08-21 15:51:56,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 15:51:56,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:56,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 15:51:56,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 15:51:56,838 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 15:51:57,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:57,795 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 15:51:57,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 15:51:57,795 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 15:51:57,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:57,796 INFO L225 Difference]: With dead ends: 55 [2020-08-21 15:51:57,796 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 15:51:57,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 15:51:57,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 15:51:57,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 15:51:57,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 15:51:57,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 15:51:57,803 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 15:51:57,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:57,803 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 15:51:57,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 15:51:57,803 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 15:51:57,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 15:51:57,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:57,804 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:57,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 15:51:57,804 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:57,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:57,805 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 15:51:57,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:57,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1208862788] [2020-08-21 15:51:57,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:57,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:59,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:59,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:59,007 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:59,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1208862788] [2020-08-21 15:51:59,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:59,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 15:51:59,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977817803] [2020-08-21 15:51:59,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 15:51:59,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:59,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 15:51:59,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 15:51:59,009 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 15:52:00,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:00,088 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 15:52:00,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 15:52:00,089 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 15:52:00,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:00,090 INFO L225 Difference]: With dead ends: 56 [2020-08-21 15:52:00,090 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 15:52:00,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 15:52:00,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 15:52:00,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 15:52:00,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 15:52:00,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 15:52:00,094 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 15:52:00,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:00,094 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 15:52:00,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 15:52:00,094 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 15:52:00,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 15:52:00,095 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:00,095 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:00,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 15:52:00,095 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:00,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:00,095 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 15:52:00,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:00,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1447529163] [2020-08-21 15:52:00,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:00,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:01,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:01,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:01,367 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:01,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1447529163] [2020-08-21 15:52:01,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:01,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 15:52:01,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133008015] [2020-08-21 15:52:01,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 15:52:01,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:01,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 15:52:01,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 15:52:01,369 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 15:52:02,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:02,440 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 15:52:02,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 15:52:02,441 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 15:52:02,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:02,442 INFO L225 Difference]: With dead ends: 57 [2020-08-21 15:52:02,442 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 15:52:02,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 15:52:02,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 15:52:02,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 15:52:02,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 15:52:02,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 15:52:02,447 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 15:52:02,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:02,447 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 15:52:02,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 15:52:02,447 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 15:52:02,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 15:52:02,448 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:02,448 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:02,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 15:52:02,448 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:02,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:02,448 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 15:52:02,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:02,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603662253] [2020-08-21 15:52:02,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:02,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:04,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:04,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:04,015 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:04,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603662253] [2020-08-21 15:52:04,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:04,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 15:52:04,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669959720] [2020-08-21 15:52:04,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 15:52:04,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:04,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 15:52:04,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 15:52:04,019 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 15:52:05,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:05,097 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 15:52:05,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 15:52:05,098 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 15:52:05,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:05,099 INFO L225 Difference]: With dead ends: 58 [2020-08-21 15:52:05,099 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 15:52:05,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 15:52:05,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 15:52:05,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 15:52:05,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 15:52:05,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 15:52:05,107 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 15:52:05,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:05,107 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 15:52:05,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 15:52:05,107 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 15:52:05,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 15:52:05,108 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:05,108 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:05,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 15:52:05,108 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:05,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:05,109 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 15:52:05,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:05,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481939434] [2020-08-21 15:52:05,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:05,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:06,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:06,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:06,716 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:06,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481939434] [2020-08-21 15:52:06,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:06,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 15:52:06,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876160759] [2020-08-21 15:52:06,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 15:52:06,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:06,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 15:52:06,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 15:52:06,719 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 15:52:07,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:07,957 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 15:52:07,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 15:52:07,959 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 15:52:07,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:07,960 INFO L225 Difference]: With dead ends: 59 [2020-08-21 15:52:07,960 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 15:52:07,962 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 15:52:07,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 15:52:07,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 15:52:07,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 15:52:07,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 15:52:07,966 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 15:52:07,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:07,966 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 15:52:07,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 15:52:07,967 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 15:52:07,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 15:52:07,967 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:07,967 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:07,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 15:52:07,967 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:07,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:07,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 15:52:07,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:07,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1252440613] [2020-08-21 15:52:07,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:07,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:09,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:09,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:09,454 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:09,454 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1252440613] [2020-08-21 15:52:09,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:09,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 15:52:09,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716616665] [2020-08-21 15:52:09,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 15:52:09,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:09,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 15:52:09,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 15:52:09,456 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 15:52:10,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:10,708 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 15:52:10,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 15:52:10,714 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 15:52:10,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:10,715 INFO L225 Difference]: With dead ends: 60 [2020-08-21 15:52:10,715 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 15:52:10,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 15:52:10,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 15:52:10,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 15:52:10,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 15:52:10,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 15:52:10,719 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 15:52:10,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:10,720 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 15:52:10,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 15:52:10,720 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 15:52:10,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 15:52:10,720 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:10,720 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:10,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 15:52:10,721 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:10,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:10,721 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 15:52:10,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:10,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140081283] [2020-08-21 15:52:10,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:10,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:12,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:12,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:12,313 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:12,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140081283] [2020-08-21 15:52:12,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:12,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 15:52:12,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804686980] [2020-08-21 15:52:12,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 15:52:12,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:12,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 15:52:12,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 15:52:12,314 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 15:52:13,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:13,618 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 15:52:13,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 15:52:13,619 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 15:52:13,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:13,620 INFO L225 Difference]: With dead ends: 61 [2020-08-21 15:52:13,620 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 15:52:13,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 15:52:13,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 15:52:13,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 15:52:13,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 15:52:13,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 15:52:13,624 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 15:52:13,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:13,624 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 15:52:13,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 15:52:13,624 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 15:52:13,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 15:52:13,625 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:13,625 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:13,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 15:52:13,625 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:13,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:13,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 15:52:13,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:13,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [798939268] [2020-08-21 15:52:13,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:13,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:15,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:15,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:15,206 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:15,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [798939268] [2020-08-21 15:52:15,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:15,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 15:52:15,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832173547] [2020-08-21 15:52:15,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 15:52:15,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:15,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 15:52:15,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 15:52:15,207 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 15:52:16,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:16,547 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 15:52:16,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 15:52:16,547 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 15:52:16,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:16,548 INFO L225 Difference]: With dead ends: 62 [2020-08-21 15:52:16,548 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 15:52:16,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 15:52:16,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 15:52:16,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 15:52:16,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 15:52:16,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 15:52:16,553 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 15:52:16,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:16,554 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 15:52:16,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 15:52:16,554 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 15:52:16,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 15:52:16,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:16,555 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:16,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 15:52:16,555 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:16,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:16,555 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 15:52:16,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:16,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2025680174] [2020-08-21 15:52:16,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:16,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat