/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=BIGGEST --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/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 17:27:56,077 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 17:27:56,080 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 17:27:56,122 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 17:27:56,122 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:27:56,131 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:27:56,133 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:27:56,137 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:27:56,140 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:27:56,143 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:27:56,144 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:27:56,145 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:27:56,145 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:27:56,148 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:27:56,151 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:27:56,152 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:27:56,153 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:27:56,156 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:27:56,157 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:27:56,166 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:27:56,169 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:27:56,170 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:27:56,171 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:27:56,171 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:27:56,184 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 17:27:56,184 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 17:27:56,184 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 17:27:56,192 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 17:27:56,193 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 17:27:56,197 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 17:27:56,197 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 17:27:56,198 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 17:27:56,199 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 17:27:56,199 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 17:27:56,202 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 17:27:56,203 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 17:27:56,203 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 17:27:56,203 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 17:27:56,204 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:27:56,204 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:27:56,205 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:27:56,206 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 17:27:56,228 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:27:56,228 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:27:56,229 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:27:56,230 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:27:56,230 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:27:56,230 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:27:56,230 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:27:56,231 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:27:56,231 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:27:56,231 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:27:56,231 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:27:56,231 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:27:56,231 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:27:56,232 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:27:56,232 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:27:56,232 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:27:56,232 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:27:56,232 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:27:56,233 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:27:56,233 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:27:56,233 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:27:56,233 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:27:56,233 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:27:56,234 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:27:56,234 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:27:56,234 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:27:56,234 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:27:56,234 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:27:56,235 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:27:56,235 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=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:27:56,569 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:27:56,579 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:27:56,584 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:27:56,587 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:27:56,587 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:27:56,588 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-21 17:27:56,660 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/556de9935/2125fe0a0c4246faad7c8eea97e2b8fb/FLAG42cea7598 [2020-08-21 17:27:57,072 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:27:57,073 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-21 17:27:57,081 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/556de9935/2125fe0a0c4246faad7c8eea97e2b8fb/FLAG42cea7598 [2020-08-21 17:27:57,445 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/556de9935/2125fe0a0c4246faad7c8eea97e2b8fb [2020-08-21 17:27:57,454 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:27:57,456 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:27:57,457 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:27:57,458 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:27:57,461 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:27:57,463 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:27:57" (1/1) ... [2020-08-21 17:27:57,467 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d16764e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:57, skipping insertion in model container [2020-08-21 17:27:57,467 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:27:57" (1/1) ... [2020-08-21 17:27:57,475 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:27:57,492 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:27:57,667 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:27:57,672 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:27:57,688 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:27:57,705 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:27:57,705 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:57 WrapperNode [2020-08-21 17:27:57,706 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:27:57,706 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:27:57,707 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:27:57,707 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:27:57,723 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:57" (1/1) ... [2020-08-21 17:27:57,723 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:57" (1/1) ... [2020-08-21 17:27:57,728 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:57" (1/1) ... [2020-08-21 17:27:57,729 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:57" (1/1) ... [2020-08-21 17:27:57,732 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:57" (1/1) ... [2020-08-21 17:27:57,738 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:57" (1/1) ... [2020-08-21 17:27:57,739 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:57" (1/1) ... [2020-08-21 17:27:57,835 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:27:57,836 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:27:57,836 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:27:57,836 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:27:57,837 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:57" (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 17:27:57,908 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:27:57,908 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:27:57,908 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 17:27:57,908 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:27:57,908 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:27:57,909 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 17:27:57,909 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:27:57,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:27:57,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:27:58,087 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:27:58,087 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 17:27:58,091 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:27:58 BoogieIcfgContainer [2020-08-21 17:27:58,091 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:27:58,093 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:27:58,093 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:27:58,096 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:27:58,096 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:27:57" (1/3) ... [2020-08-21 17:27:58,097 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77377e1e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:27:58, skipping insertion in model container [2020-08-21 17:27:58,098 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:57" (2/3) ... [2020-08-21 17:27:58,098 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77377e1e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:27:58, skipping insertion in model container [2020-08-21 17:27:58,098 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:27:58" (3/3) ... [2020-08-21 17:27:58,100 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-21 17:27:58,111 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:27:58,119 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 17:27:58,134 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 17:27:58,156 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:27:58,156 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:27:58,156 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:27:58,156 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:27:58,157 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:27:58,157 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:27:58,157 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:27:58,157 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:27:58,176 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 17:27:58,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 17:27:58,181 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:58,182 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:58,183 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:58,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:58,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 17:27:58,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:58,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [864498426] [2020-08-21 17:27:58,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:58,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,524 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5 [2020-08-21 17:27:58,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:58,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,532 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 17:27:58,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [864498426] [2020-08-21 17:27:58,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:58,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 17:27:58,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96981011] [2020-08-21 17:27:58,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 17:27:58,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:58,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 17:27:58,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 17:27:58,557 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 17:27:58,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:58,584 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 17:27:58,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 17:27:58,586 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 17:27:58,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:58,594 INFO L225 Difference]: With dead ends: 29 [2020-08-21 17:27:58,595 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 17:27:58,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 17:27:58,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 17:27:58,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 17:27:58,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 17:27:58,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 17:27:58,637 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 17:27:58,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:58,637 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 17:27:58,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 17:27:58,638 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 17:27:58,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 17:27:58,639 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:58,639 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:58,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:27:58,640 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:58,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:58,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 17:27:58,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:58,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1003462888] [2020-08-21 17:27:58,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:58,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:58,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,732 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 17:27:58,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1003462888] [2020-08-21 17:27:58,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:58,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 17:27:58,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146342220] [2020-08-21 17:27:58,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 17:27:58,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:58,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 17:27:58,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:27:58,736 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 17:27:58,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:58,762 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 17:27:58,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 17:27:58,763 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 17:27:58,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:58,764 INFO L225 Difference]: With dead ends: 18 [2020-08-21 17:27:58,764 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 17:27:58,765 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 17:27:58,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 17:27:58,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 17:27:58,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 17:27:58,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 17:27:58,771 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 17:27:58,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:58,771 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 17:27:58,771 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 17:27:58,771 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 17:27:58,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 17:27:58,772 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:58,772 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:58,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:27:58,773 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:58,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:58,774 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 17:27:58,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:58,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [347363481] [2020-08-21 17:27:58,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:58,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:58,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,870 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 17:27:58,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [347363481] [2020-08-21 17:27:58,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:58,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 17:27:58,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346315111] [2020-08-21 17:27:58,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:27:58,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:58,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:27:58,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:58,873 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 17:27:58,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:58,895 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 17:27:58,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:27:58,896 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 17:27:58,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:58,897 INFO L225 Difference]: With dead ends: 19 [2020-08-21 17:27:58,897 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 17:27:58,898 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 17:27:58,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 17:27:58,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 17:27:58,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 17:27:58,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 17:27:58,904 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 17:27:58,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:58,904 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 17:27:58,904 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:27:58,904 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 17:27:58,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 17:27:58,905 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:58,905 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:58,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 17:27:58,906 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:58,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:58,907 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 17:27:58,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:58,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [3099554] [2020-08-21 17:27:58,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:58,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:59,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,030 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 17:27:59,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [3099554] [2020-08-21 17:27:59,031 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:59,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 17:27:59,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898872554] [2020-08-21 17:27:59,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 17:27:59,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:59,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 17:27:59,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:27:59,033 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 17:27:59,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:59,060 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 17:27:59,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 17:27:59,061 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 17:27:59,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:59,062 INFO L225 Difference]: With dead ends: 20 [2020-08-21 17:27:59,062 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 17:27:59,063 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 17:27:59,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 17:27:59,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 17:27:59,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 17:27:59,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 17:27:59,069 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 17:27:59,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:59,069 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 17:27:59,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 17:27:59,069 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 17:27:59,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 17:27:59,070 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:59,070 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:59,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 17:27:59,071 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:59,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:59,071 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 17:27:59,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:59,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435280838] [2020-08-21 17:27:59,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:59,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:59,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,191 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 17:27:59,191 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435280838] [2020-08-21 17:27:59,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:59,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:27:59,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818668477] [2020-08-21 17:27:59,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:27:59,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:59,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:27:59,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:27:59,194 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 17:27:59,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:59,232 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 17:27:59,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:27:59,233 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 17:27:59,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:59,234 INFO L225 Difference]: With dead ends: 21 [2020-08-21 17:27:59,234 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 17:27:59,235 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 17:27:59,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 17:27:59,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 17:27:59,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 17:27:59,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 17:27:59,240 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 17:27:59,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:59,241 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 17:27:59,241 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:27:59,241 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 17:27:59,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 17:27:59,242 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:59,242 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:59,243 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 17:27:59,243 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:59,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:59,243 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 17:27:59,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:59,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108857692] [2020-08-21 17:27:59,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:59,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:59,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,414 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 17:27:59,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108857692] [2020-08-21 17:27:59,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:59,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 17:27:59,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311736820] [2020-08-21 17:27:59,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 17:27:59,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:59,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 17:27:59,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:27:59,417 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 17:27:59,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:59,464 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 17:27:59,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 17:27:59,465 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 17:27:59,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:59,465 INFO L225 Difference]: With dead ends: 22 [2020-08-21 17:27:59,466 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 17:27:59,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:27:59,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 17:27:59,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 17:27:59,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 17:27:59,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 17:27:59,472 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 17:27:59,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:59,472 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 17:27:59,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 17:27:59,472 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 17:27:59,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 17:27:59,473 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:59,473 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:59,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 17:27:59,474 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:59,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:59,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 17:27:59,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:59,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1735475441] [2020-08-21 17:27:59,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:59,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:59,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,637 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 17:27:59,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1735475441] [2020-08-21 17:27:59,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:59,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 17:27:59,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307634531] [2020-08-21 17:27:59,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 17:27:59,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:59,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 17:27:59,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:27:59,647 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 17:27:59,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:59,710 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 17:27:59,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 17:27:59,711 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 17:27:59,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:59,711 INFO L225 Difference]: With dead ends: 23 [2020-08-21 17:27:59,711 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 17:27:59,713 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 17:27:59,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 17:27:59,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 17:27:59,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 17:27:59,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 17:27:59,721 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 17:27:59,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:59,721 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 17:27:59,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 17:27:59,722 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 17:27:59,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 17:27:59,723 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:59,723 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:59,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 17:27:59,724 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:59,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:59,724 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 17:27:59,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:59,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [716776052] [2020-08-21 17:27:59,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:59,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:59,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,931 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 17:27:59,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [716776052] [2020-08-21 17:27:59,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:59,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 17:27:59,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636206474] [2020-08-21 17:27:59,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 17:27:59,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:59,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 17:27:59,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:27:59,934 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 17:27:59,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:59,993 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 17:27:59,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 17:27:59,995 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 17:27:59,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:59,997 INFO L225 Difference]: With dead ends: 24 [2020-08-21 17:27:59,997 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 17:27:59,998 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 17:27:59,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 17:28:00,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 17:28:00,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 17:28:00,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 17:28:00,005 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 17:28:00,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:00,006 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 17:28:00,006 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 17:28:00,007 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 17:28:00,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 17:28:00,007 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:00,007 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:00,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 17:28:00,008 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:00,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:00,008 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 17:28:00,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:00,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1050456776] [2020-08-21 17:28:00,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:00,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:00,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,192 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 17:28:00,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1050456776] [2020-08-21 17:28:00,193 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:00,193 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 17:28:00,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173047868] [2020-08-21 17:28:00,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 17:28:00,194 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:00,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 17:28:00,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:28:00,195 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 17:28:00,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:00,256 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 17:28:00,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 17:28:00,257 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 17:28:00,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:00,258 INFO L225 Difference]: With dead ends: 25 [2020-08-21 17:28:00,258 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 17:28:00,259 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 17:28:00,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 17:28:00,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 17:28:00,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 17:28:00,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 17:28:00,264 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 17:28:00,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:00,264 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 17:28:00,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 17:28:00,264 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 17:28:00,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 17:28:00,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:00,265 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:00,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 17:28:00,266 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:00,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:00,266 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 17:28:00,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:00,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1492251090] [2020-08-21 17:28:00,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:00,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:00,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,428 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 17:28:00,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1492251090] [2020-08-21 17:28:00,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:00,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 17:28:00,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622713095] [2020-08-21 17:28:00,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 17:28:00,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:00,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 17:28:00,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:28:00,430 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 17:28:00,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:00,527 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 17:28:00,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 17:28:00,528 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 17:28:00,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:00,528 INFO L225 Difference]: With dead ends: 26 [2020-08-21 17:28:00,529 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 17:28:00,529 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 17:28:00,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 17:28:00,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 17:28:00,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 17:28:00,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 17:28:00,543 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 17:28:00,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:00,544 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 17:28:00,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 17:28:00,544 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 17:28:00,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 17:28:00,545 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:00,545 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:00,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 17:28:00,545 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:00,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:00,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 17:28:00,546 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:00,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1137055484] [2020-08-21 17:28:00,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:00,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:00,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,724 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 17:28:00,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1137055484] [2020-08-21 17:28:00,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:00,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 17:28:00,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196163753] [2020-08-21 17:28:00,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 17:28:00,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:00,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 17:28:00,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:28:00,727 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 17:28:00,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:00,820 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 17:28:00,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 17:28:00,821 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 17:28:00,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:00,822 INFO L225 Difference]: With dead ends: 27 [2020-08-21 17:28:00,822 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 17:28:00,822 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 17:28:00,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 17:28:00,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 17:28:00,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 17:28:00,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 17:28:00,827 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 17:28:00,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:00,827 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 17:28:00,828 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 17:28:00,828 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 17:28:00,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 17:28:00,828 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:00,829 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:00,829 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 17:28:00,829 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:00,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:00,829 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 17:28:00,830 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:00,830 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [867434981] [2020-08-21 17:28:00,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:00,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:01,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:01,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:01,024 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 17:28:01,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [867434981] [2020-08-21 17:28:01,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:01,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 17:28:01,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222711738] [2020-08-21 17:28:01,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 17:28:01,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:01,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 17:28:01,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:28:01,026 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 17:28:01,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:01,130 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 17:28:01,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 17:28:01,131 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 17:28:01,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:01,132 INFO L225 Difference]: With dead ends: 28 [2020-08-21 17:28:01,132 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 17:28:01,132 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 17:28:01,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 17:28:01,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 17:28:01,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 17:28:01,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 17:28:01,137 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 17:28:01,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:01,138 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 17:28:01,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 17:28:01,138 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 17:28:01,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 17:28:01,138 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:01,139 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:01,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 17:28:01,139 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:01,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:01,139 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 17:28:01,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:01,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1888665139] [2020-08-21 17:28:01,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:01,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:01,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:01,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:01,351 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 17:28:01,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1888665139] [2020-08-21 17:28:01,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:01,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 17:28:01,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728629657] [2020-08-21 17:28:01,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 17:28:01,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:01,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 17:28:01,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:28:01,353 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 17:28:01,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:01,475 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 17:28:01,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 17:28:01,476 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 17:28:01,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:01,477 INFO L225 Difference]: With dead ends: 29 [2020-08-21 17:28:01,477 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 17:28:01,477 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 17:28:01,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 17:28:01,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 17:28:01,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 17:28:01,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 17:28:01,482 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 17:28:01,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:01,482 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 17:28:01,482 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 17:28:01,483 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 17:28:01,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 17:28:01,483 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:01,483 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:01,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 17:28:01,484 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:01,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:01,484 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 17:28:01,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:01,485 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2086169132] [2020-08-21 17:28:01,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:01,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:01,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:01,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:01,707 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 17:28:01,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2086169132] [2020-08-21 17:28:01,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:01,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 17:28:01,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593328000] [2020-08-21 17:28:01,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 17:28:01,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:01,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 17:28:01,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:28:01,710 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 17:28:01,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:01,847 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 17:28:01,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 17:28:01,848 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 17:28:01,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:01,849 INFO L225 Difference]: With dead ends: 30 [2020-08-21 17:28:01,849 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 17:28:01,850 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 17:28:01,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 17:28:01,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 17:28:01,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 17:28:01,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 17:28:01,854 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 17:28:01,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:01,855 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 17:28:01,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 17:28:01,855 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 17:28:01,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 17:28:01,856 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:01,856 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:01,856 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 17:28:01,857 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:01,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:01,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 17:28:01,857 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:01,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1184050805] [2020-08-21 17:28:01,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:01,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:02,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:02,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:02,098 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 17:28:02,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1184050805] [2020-08-21 17:28:02,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:02,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 17:28:02,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162723700] [2020-08-21 17:28:02,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 17:28:02,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:02,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 17:28:02,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:28:02,100 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 17:28:02,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:02,257 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 17:28:02,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 17:28:02,258 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 17:28:02,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:02,259 INFO L225 Difference]: With dead ends: 31 [2020-08-21 17:28:02,259 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 17:28:02,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:28:02,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 17:28:02,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 17:28:02,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 17:28:02,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 17:28:02,264 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 17:28:02,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:02,264 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 17:28:02,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 17:28:02,265 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 17:28:02,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 17:28:02,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:02,266 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:02,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 17:28:02,266 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:02,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:02,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 17:28:02,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:02,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592761231] [2020-08-21 17:28:02,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:02,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:02,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:02,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:02,545 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 17:28:02,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592761231] [2020-08-21 17:28:02,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:02,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 17:28:02,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920872252] [2020-08-21 17:28:02,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 17:28:02,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:02,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 17:28:02,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:28:02,548 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 17:28:02,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:02,720 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 17:28:02,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 17:28:02,720 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 17:28:02,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:02,721 INFO L225 Difference]: With dead ends: 32 [2020-08-21 17:28:02,721 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 17:28:02,722 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 17:28:02,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 17:28:02,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 17:28:02,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 17:28:02,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 17:28:02,727 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 17:28:02,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:02,727 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 17:28:02,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 17:28:02,727 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 17:28:02,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 17:28:02,728 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:02,728 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:02,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 17:28:02,728 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:02,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:02,729 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 17:28:02,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:02,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698155315] [2020-08-21 17:28:02,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:02,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:02,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:03,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:03,003 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 17:28:03,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698155315] [2020-08-21 17:28:03,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:03,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 17:28:03,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236324939] [2020-08-21 17:28:03,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 17:28:03,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:03,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 17:28:03,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:28:03,005 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 17:28:03,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:03,215 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 17:28:03,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 17:28:03,217 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 17:28:03,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:03,218 INFO L225 Difference]: With dead ends: 33 [2020-08-21 17:28:03,218 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 17:28:03,218 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 17:28:03,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 17:28:03,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 17:28:03,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 17:28:03,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 17:28:03,224 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 17:28:03,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:03,225 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 17:28:03,225 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 17:28:03,225 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 17:28:03,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 17:28:03,226 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:03,226 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:03,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 17:28:03,226 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:03,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:03,227 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 17:28:03,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:03,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [745936954] [2020-08-21 17:28:03,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:03,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:03,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:03,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:03,522 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 17:28:03,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [745936954] [2020-08-21 17:28:03,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:03,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 17:28:03,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862851514] [2020-08-21 17:28:03,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 17:28:03,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:03,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 17:28:03,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:28:03,526 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 17:28:03,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:03,750 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 17:28:03,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 17:28:03,751 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 17:28:03,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:03,752 INFO L225 Difference]: With dead ends: 34 [2020-08-21 17:28:03,752 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 17:28:03,753 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 17:28:03,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 17:28:03,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 17:28:03,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 17:28:03,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 17:28:03,758 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 17:28:03,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:03,758 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 17:28:03,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 17:28:03,758 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 17:28:03,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 17:28:03,759 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:03,759 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:03,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 17:28:03,759 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:03,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:03,760 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 17:28:03,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:03,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729838759] [2020-08-21 17:28:03,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:03,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:04,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,109 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 17:28:04,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729838759] [2020-08-21 17:28:04,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:04,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 17:28:04,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371823030] [2020-08-21 17:28:04,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 17:28:04,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:04,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 17:28:04,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:28:04,112 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 17:28:04,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:04,366 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 17:28:04,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 17:28:04,366 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 17:28:04,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:04,367 INFO L225 Difference]: With dead ends: 35 [2020-08-21 17:28:04,367 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 17:28:04,368 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 17:28:04,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 17:28:04,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 17:28:04,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 17:28:04,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 17:28:04,373 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 17:28:04,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:04,373 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 17:28:04,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 17:28:04,373 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 17:28:04,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 17:28:04,374 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:04,374 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:04,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 17:28:04,374 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:04,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:04,375 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 17:28:04,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:04,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047149515] [2020-08-21 17:28:04,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:04,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:04,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,743 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 17:28:04,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047149515] [2020-08-21 17:28:04,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:04,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 17:28:04,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599041352] [2020-08-21 17:28:04,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 17:28:04,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:04,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 17:28:04,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:28:04,745 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 17:28:05,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:05,015 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 17:28:05,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 17:28:05,018 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 17:28:05,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:05,019 INFO L225 Difference]: With dead ends: 36 [2020-08-21 17:28:05,019 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 17:28:05,020 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 17:28:05,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 17:28:05,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 17:28:05,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 17:28:05,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 17:28:05,028 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 17:28:05,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:05,028 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 17:28:05,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 17:28:05,029 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 17:28:05,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 17:28:05,030 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:05,030 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:05,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 17:28:05,030 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:05,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:05,031 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 17:28:05,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:05,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111025608] [2020-08-21 17:28:05,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:05,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,467 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:05,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,471 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 17:28:05,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111025608] [2020-08-21 17:28:05,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:05,472 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 17:28:05,472 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896374189] [2020-08-21 17:28:05,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 17:28:05,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:05,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 17:28:05,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:28:05,474 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 17:28:05,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:05,788 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 17:28:05,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 17:28:05,790 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 17:28:05,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:05,790 INFO L225 Difference]: With dead ends: 37 [2020-08-21 17:28:05,790 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 17:28:05,791 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 17:28:05,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 17:28:05,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 17:28:05,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 17:28:05,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 17:28:05,797 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 17:28:05,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:05,797 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 17:28:05,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 17:28:05,797 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 17:28:05,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 17:28:05,798 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:05,798 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:05,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 17:28:05,798 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:05,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:05,799 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 17:28:05,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:05,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [484822457] [2020-08-21 17:28:05,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:05,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:06,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:06,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:06,205 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 17:28:06,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [484822457] [2020-08-21 17:28:06,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:06,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 17:28:06,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092574060] [2020-08-21 17:28:06,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 17:28:06,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:06,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 17:28:06,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 17:28:06,208 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 17:28:06,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:06,537 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 17:28:06,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 17:28:06,540 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 17:28:06,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:06,540 INFO L225 Difference]: With dead ends: 38 [2020-08-21 17:28:06,540 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 17:28:06,541 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 17:28:06,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 17:28:06,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 17:28:06,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 17:28:06,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 17:28:06,545 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 17:28:06,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:06,546 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 17:28:06,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 17:28:06,546 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 17:28:06,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 17:28:06,547 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:06,547 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:06,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 17:28:06,547 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:06,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:06,548 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 17:28:06,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:06,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1451393477] [2020-08-21 17:28:06,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:06,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:07,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:07,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:07,047 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 17:28:07,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1451393477] [2020-08-21 17:28:07,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:07,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 17:28:07,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997436507] [2020-08-21 17:28:07,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 17:28:07,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:07,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 17:28:07,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 17:28:07,049 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 17:28:07,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:07,418 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 17:28:07,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 17:28:07,419 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 17:28:07,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:07,419 INFO L225 Difference]: With dead ends: 39 [2020-08-21 17:28:07,420 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 17:28:07,420 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 17:28:07,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 17:28:07,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 17:28:07,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 17:28:07,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 17:28:07,437 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 17:28:07,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:07,437 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 17:28:07,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 17:28:07,438 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 17:28:07,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 17:28:07,441 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:07,441 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:07,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 17:28:07,442 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:07,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:07,442 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 17:28:07,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:07,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [236583356] [2020-08-21 17:28:07,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:07,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:07,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:07,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:07,997 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 17:28:07,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [236583356] [2020-08-21 17:28:07,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:07,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 17:28:07,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011876721] [2020-08-21 17:28:07,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 17:28:07,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:07,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 17:28:07,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 17:28:07,999 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 17:28:08,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:08,362 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 17:28:08,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 17:28:08,362 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 17:28:08,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:08,363 INFO L225 Difference]: With dead ends: 40 [2020-08-21 17:28:08,363 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 17:28:08,364 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 17:28:08,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 17:28:08,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 17:28:08,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 17:28:08,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 17:28:08,371 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 17:28:08,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:08,372 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 17:28:08,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 17:28:08,372 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 17:28:08,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 17:28:08,373 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:08,373 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:08,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 17:28:08,376 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:08,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:08,376 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 17:28:08,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:08,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1818643445] [2020-08-21 17:28:08,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:08,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:08,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:08,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:08,881 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 17:28:08,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1818643445] [2020-08-21 17:28:08,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:08,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 17:28:08,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955332842] [2020-08-21 17:28:08,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 17:28:08,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:08,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 17:28:08,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:28:08,883 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 17:28:09,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:09,245 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 17:28:09,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 17:28:09,246 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 17:28:09,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:09,246 INFO L225 Difference]: With dead ends: 41 [2020-08-21 17:28:09,247 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 17:28:09,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:28:09,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 17:28:09,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 17:28:09,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 17:28:09,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 17:28:09,251 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 17:28:09,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:09,252 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 17:28:09,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 17:28:09,252 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 17:28:09,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 17:28:09,252 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:09,253 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:09,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 17:28:09,253 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:09,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:09,253 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 17:28:09,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:09,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349764113] [2020-08-21 17:28:09,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:09,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:09,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:09,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:09,836 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 17:28:09,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349764113] [2020-08-21 17:28:09,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:09,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 17:28:09,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447612499] [2020-08-21 17:28:09,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 17:28:09,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:09,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 17:28:09,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 17:28:09,838 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 17:28:10,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:10,292 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 17:28:10,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 17:28:10,293 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 17:28:10,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:10,294 INFO L225 Difference]: With dead ends: 42 [2020-08-21 17:28:10,294 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 17:28:10,294 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 17:28:10,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 17:28:10,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 17:28:10,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 17:28:10,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 17:28:10,299 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 17:28:10,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:10,300 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 17:28:10,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 17:28:10,300 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 17:28:10,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 17:28:10,301 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:10,301 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:10,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 17:28:10,301 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:10,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:10,302 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 17:28:10,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:10,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909021579] [2020-08-21 17:28:10,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:10,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:10,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:10,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:10,933 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 17:28:10,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909021579] [2020-08-21 17:28:10,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:10,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 17:28:10,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133395648] [2020-08-21 17:28:10,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 17:28:10,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:10,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 17:28:10,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 17:28:10,936 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 17:28:11,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:11,399 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 17:28:11,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 17:28:11,399 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 17:28:11,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:11,400 INFO L225 Difference]: With dead ends: 43 [2020-08-21 17:28:11,401 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 17:28:11,401 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 17:28:11,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 17:28:11,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 17:28:11,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 17:28:11,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 17:28:11,406 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 17:28:11,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:11,406 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 17:28:11,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 17:28:11,407 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 17:28:11,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 17:28:11,407 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:11,407 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:11,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 17:28:11,408 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:11,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:11,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 17:28:11,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:11,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307328618] [2020-08-21 17:28:11,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:11,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:12,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:12,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:12,081 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 17:28:12,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307328618] [2020-08-21 17:28:12,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:12,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 17:28:12,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074039986] [2020-08-21 17:28:12,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 17:28:12,082 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:12,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 17:28:12,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 17:28:12,083 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 17:28:12,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:12,605 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 17:28:12,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 17:28:12,607 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 17:28:12,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:12,608 INFO L225 Difference]: With dead ends: 44 [2020-08-21 17:28:12,608 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 17:28:12,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 17:28:12,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 17:28:12,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 17:28:12,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 17:28:12,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 17:28:12,614 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 17:28:12,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:12,614 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 17:28:12,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 17:28:12,614 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 17:28:12,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 17:28:12,615 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:12,615 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:12,615 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 17:28:12,615 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:12,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:12,615 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 17:28:12,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:12,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827949772] [2020-08-21 17:28:12,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:12,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:13,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:13,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:13,306 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 17:28:13,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827949772] [2020-08-21 17:28:13,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:13,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 17:28:13,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20725561] [2020-08-21 17:28:13,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 17:28:13,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:13,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 17:28:13,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 17:28:13,310 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 17:28:13,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:13,798 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 17:28:13,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 17:28:13,799 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 17:28:13,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:13,807 INFO L225 Difference]: With dead ends: 45 [2020-08-21 17:28:13,807 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 17:28:13,808 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 17:28:13,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 17:28:13,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 17:28:13,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 17:28:13,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 17:28:13,812 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 17:28:13,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:13,812 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 17:28:13,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 17:28:13,812 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 17:28:13,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 17:28:13,813 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:13,813 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:13,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 17:28:13,813 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:13,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:13,814 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 17:28:13,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:13,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1069872682] [2020-08-21 17:28:13,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:13,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:14,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:14,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:14,522 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 17:28:14,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1069872682] [2020-08-21 17:28:14,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:14,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 17:28:14,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786351991] [2020-08-21 17:28:14,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 17:28:14,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:14,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 17:28:14,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 17:28:14,524 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 17:28:15,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:15,112 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 17:28:15,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 17:28:15,117 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 17:28:15,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:15,118 INFO L225 Difference]: With dead ends: 46 [2020-08-21 17:28:15,118 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 17:28:15,119 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 17:28:15,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 17:28:15,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 17:28:15,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 17:28:15,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 17:28:15,123 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 17:28:15,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:15,124 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 17:28:15,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 17:28:15,124 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 17:28:15,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 17:28:15,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:15,125 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:15,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 17:28:15,125 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:15,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:15,125 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 17:28:15,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:15,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891420348] [2020-08-21 17:28:15,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:15,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:15,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:15,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:15,924 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 17:28:15,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891420348] [2020-08-21 17:28:15,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:15,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 17:28:15,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472721572] [2020-08-21 17:28:15,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 17:28:15,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:15,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 17:28:15,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 17:28:15,926 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 17:28:16,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:16,560 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 17:28:16,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 17:28:16,561 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 17:28:16,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:16,562 INFO L225 Difference]: With dead ends: 47 [2020-08-21 17:28:16,563 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 17:28:16,564 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 17:28:16,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 17:28:16,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 17:28:16,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 17:28:16,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 17:28:16,568 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 17:28:16,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:16,568 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 17:28:16,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 17:28:16,568 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 17:28:16,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 17:28:16,569 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:16,569 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:16,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 17:28:16,569 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:16,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:16,569 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 17:28:16,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:16,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499475074] [2020-08-21 17:28:16,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:16,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:17,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:17,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:17,420 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 17:28:17,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [499475074] [2020-08-21 17:28:17,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:17,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 17:28:17,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512118247] [2020-08-21 17:28:17,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 17:28:17,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:17,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 17:28:17,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:28:17,423 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 17:28:18,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:18,098 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 17:28:18,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 17:28:18,098 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 17:28:18,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:18,099 INFO L225 Difference]: With dead ends: 48 [2020-08-21 17:28:18,099 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 17:28:18,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:28:18,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 17:28:18,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 17:28:18,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 17:28:18,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 17:28:18,104 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 17:28:18,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:18,104 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 17:28:18,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 17:28:18,104 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 17:28:18,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 17:28:18,105 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:18,105 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:18,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 17:28:18,105 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:18,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:18,106 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 17:28:18,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:18,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2101387961] [2020-08-21 17:28:18,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:18,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:18,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:18,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:18,996 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 17:28:18,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2101387961] [2020-08-21 17:28:18,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:18,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 17:28:18,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166082308] [2020-08-21 17:28:18,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 17:28:18,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:18,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 17:28:18,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 17:28:18,998 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 17:28:19,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:19,699 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 17:28:19,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 17:28:19,699 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 17:28:19,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:19,700 INFO L225 Difference]: With dead ends: 49 [2020-08-21 17:28:19,700 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 17:28:19,701 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 17:28:19,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 17:28:19,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 17:28:19,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 17:28:19,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 17:28:19,705 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 17:28:19,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:19,706 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 17:28:19,706 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 17:28:19,706 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 17:28:19,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 17:28:19,707 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:19,707 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:19,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 17:28:19,707 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:19,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:19,708 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 17:28:19,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:19,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318507771] [2020-08-21 17:28:19,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:19,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:20,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:20,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:20,630 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 17:28:20,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [318507771] [2020-08-21 17:28:20,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:20,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 17:28:20,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263267180] [2020-08-21 17:28:20,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 17:28:20,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:20,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 17:28:20,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 17:28:20,637 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 17:28:21,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:21,386 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 17:28:21,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 17:28:21,387 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 17:28:21,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:21,388 INFO L225 Difference]: With dead ends: 50 [2020-08-21 17:28:21,388 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 17:28:21,388 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 17:28:21,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 17:28:21,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 17:28:21,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 17:28:21,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 17:28:21,391 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 17:28:21,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:21,392 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 17:28:21,392 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 17:28:21,392 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 17:28:21,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 17:28:21,392 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:21,392 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:21,393 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 17:28:21,393 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:21,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:21,393 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 17:28:21,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:21,394 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1391652550] [2020-08-21 17:28:21,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:21,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:22,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:22,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:22,327 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 17:28:22,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1391652550] [2020-08-21 17:28:22,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:22,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 17:28:22,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681865487] [2020-08-21 17:28:22,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 17:28:22,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:22,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 17:28:22,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 17:28:22,329 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 17:28:23,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:23,133 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 17:28:23,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 17:28:23,135 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 17:28:23,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:23,136 INFO L225 Difference]: With dead ends: 51 [2020-08-21 17:28:23,136 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 17:28:23,137 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 17:28:23,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 17:28:23,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 17:28:23,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 17:28:23,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 17:28:23,143 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 17:28:23,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:23,143 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 17:28:23,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 17:28:23,143 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 17:28:23,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 17:28:23,144 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:23,144 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:23,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 17:28:23,144 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:23,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:23,145 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 17:28:23,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:23,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263363608] [2020-08-21 17:28:23,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:23,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:24,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:24,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:24,168 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 17:28:24,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263363608] [2020-08-21 17:28:24,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:24,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 17:28:24,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539492361] [2020-08-21 17:28:24,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 17:28:24,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:24,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 17:28:24,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 17:28:24,170 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 17:28:25,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:25,010 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 17:28:25,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 17:28:25,011 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 17:28:25,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:25,011 INFO L225 Difference]: With dead ends: 52 [2020-08-21 17:28:25,012 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 17:28:25,013 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 17:28:25,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 17:28:25,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 17:28:25,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 17:28:25,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 17:28:25,016 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 17:28:25,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:25,016 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 17:28:25,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 17:28:25,017 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 17:28:25,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 17:28:25,017 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:25,017 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:25,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 17:28:25,017 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:25,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:25,018 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 17:28:25,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:25,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [666880490] [2020-08-21 17:28:25,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:25,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:26,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:26,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:26,018 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 17:28:26,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [666880490] [2020-08-21 17:28:26,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:26,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 17:28:26,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872993478] [2020-08-21 17:28:26,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 17:28:26,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:26,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 17:28:26,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 17:28:26,020 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 17:28:26,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:26,933 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 17:28:26,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 17:28:26,934 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 17:28:26,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:26,935 INFO L225 Difference]: With dead ends: 53 [2020-08-21 17:28:26,935 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 17:28:26,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 17:28:26,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 17:28:26,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 17:28:26,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 17:28:26,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 17:28:26,940 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 17:28:26,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:26,940 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 17:28:26,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 17:28:26,941 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 17:28:26,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 17:28:26,941 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:26,941 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:26,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 17:28:26,942 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:26,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:26,942 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 17:28:26,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:26,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592490668] [2020-08-21 17:28:26,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:26,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:28,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:28,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:28,047 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 17:28:28,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592490668] [2020-08-21 17:28:28,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:28,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 17:28:28,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143743510] [2020-08-21 17:28:28,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 17:28:28,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:28,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 17:28:28,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 17:28:28,049 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 17:28:28,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:28,978 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 17:28:28,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 17:28:28,979 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 17:28:28,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:28,979 INFO L225 Difference]: With dead ends: 54 [2020-08-21 17:28:28,979 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 17:28:28,980 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 17:28:28,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 17:28:28,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 17:28:28,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 17:28:28,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 17:28:28,985 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 17:28:28,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:28,985 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 17:28:28,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 17:28:28,986 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 17:28:28,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 17:28:28,986 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:28,986 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:28,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 17:28:28,987 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:28,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:28,987 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 17:28:28,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:28,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [238082165] [2020-08-21 17:28:28,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:29,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:30,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:30,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:30,161 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 17:28:30,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [238082165] [2020-08-21 17:28:30,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:30,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 17:28:30,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671781378] [2020-08-21 17:28:30,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 17:28:30,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:30,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 17:28:30,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 17:28:30,163 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 17:28:31,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:31,191 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 17:28:31,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 17:28:31,192 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 17:28:31,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:31,193 INFO L225 Difference]: With dead ends: 55 [2020-08-21 17:28:31,193 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 17:28:31,194 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 17:28:31,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 17:28:31,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 17:28:31,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 17:28:31,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 17:28:31,197 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 17:28:31,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:31,198 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 17:28:31,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 17:28:31,198 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 17:28:31,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 17:28:31,198 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:31,198 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:31,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 17:28:31,199 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:31,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:31,199 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 17:28:31,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:31,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [222580528] [2020-08-21 17:28:31,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:31,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:32,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:32,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:32,423 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 17:28:32,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [222580528] [2020-08-21 17:28:32,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:32,424 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 17:28:32,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372033955] [2020-08-21 17:28:32,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 17:28:32,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:32,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 17:28:32,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 17:28:32,425 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 17:28:33,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:33,505 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 17:28:33,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 17:28:33,506 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 17:28:33,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:33,507 INFO L225 Difference]: With dead ends: 56 [2020-08-21 17:28:33,507 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 17:28:33,507 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 17:28:33,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 17:28:33,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 17:28:33,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 17:28:33,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 17:28:33,511 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 17:28:33,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:33,512 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 17:28:33,512 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 17:28:33,512 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 17:28:33,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 17:28:33,512 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:33,512 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:33,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 17:28:33,513 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:33,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:33,513 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 17:28:33,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:33,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [385629909] [2020-08-21 17:28:33,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:33,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:34,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:34,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:34,774 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 17:28:34,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [385629909] [2020-08-21 17:28:34,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:34,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 17:28:34,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822430307] [2020-08-21 17:28:34,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 17:28:34,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:34,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 17:28:34,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 17:28:34,776 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 17:28:35,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:35,919 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 17:28:35,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 17:28:35,919 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 17:28:35,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:35,920 INFO L225 Difference]: With dead ends: 57 [2020-08-21 17:28:35,921 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 17:28:35,922 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 17:28:35,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 17:28:35,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 17:28:35,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 17:28:35,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 17:28:35,926 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 17:28:35,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:35,927 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 17:28:35,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 17:28:35,927 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 17:28:35,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 17:28:35,927 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:35,927 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:35,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 17:28:35,928 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:35,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:35,928 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 17:28:35,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:35,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [406445083] [2020-08-21 17:28:35,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:35,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:37,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:37,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:37,433 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 17:28:37,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [406445083] [2020-08-21 17:28:37,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:37,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 17:28:37,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454261865] [2020-08-21 17:28:37,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 17:28:37,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:37,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 17:28:37,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 17:28:37,437 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 17:28:38,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:38,623 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 17:28:38,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 17:28:38,624 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 17:28:38,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:38,625 INFO L225 Difference]: With dead ends: 58 [2020-08-21 17:28:38,625 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 17:28:38,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 17:28:38,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 17:28:38,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 17:28:38,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 17:28:38,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 17:28:38,631 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 17:28:38,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:38,631 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 17:28:38,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 17:28:38,631 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 17:28:38,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 17:28:38,632 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:38,632 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:38,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 17:28:38,632 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:38,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:38,633 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 17:28:38,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:38,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [49845613] [2020-08-21 17:28:38,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:38,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:40,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:40,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:40,457 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 17:28:40,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [49845613] [2020-08-21 17:28:40,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:40,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 17:28:40,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403991374] [2020-08-21 17:28:40,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 17:28:40,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:40,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 17:28:40,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 17:28:40,467 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 17:28:41,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:41,766 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 17:28:41,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 17:28:41,768 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 17:28:41,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:41,769 INFO L225 Difference]: With dead ends: 59 [2020-08-21 17:28:41,769 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 17:28:41,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 17:28:41,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 17:28:41,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 17:28:41,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 17:28:41,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 17:28:41,775 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 17:28:41,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:41,775 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 17:28:41,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 17:28:41,776 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 17:28:41,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 17:28:41,776 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:41,776 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:41,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 17:28:41,776 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:41,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:41,777 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 17:28:41,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:41,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [390959712] [2020-08-21 17:28:41,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:41,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:43,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:43,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:43,534 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 17:28:43,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [390959712] [2020-08-21 17:28:43,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:43,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 17:28:43,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334152358] [2020-08-21 17:28:43,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 17:28:43,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:43,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 17:28:43,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 17:28:43,540 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 17:28:44,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:44,837 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 17:28:44,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 17:28:44,837 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 17:28:44,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:44,838 INFO L225 Difference]: With dead ends: 60 [2020-08-21 17:28:44,838 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 17:28:44,839 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 17:28:44,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 17:28:44,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 17:28:44,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 17:28:44,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 17:28:44,843 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 17:28:44,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:44,843 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 17:28:44,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 17:28:44,843 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 17:28:44,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 17:28:44,844 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:44,844 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:44,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 17:28:44,844 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:44,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:44,844 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 17:28:44,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:44,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688866914] [2020-08-21 17:28:44,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:44,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:46,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:46,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:46,341 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 17:28:46,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688866914] [2020-08-21 17:28:46,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:46,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 17:28:46,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330310009] [2020-08-21 17:28:46,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 17:28:46,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:46,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 17:28:46,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 17:28:46,343 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 17:28:47,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:47,715 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 17:28:47,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 17:28:47,716 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 17:28:47,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:47,717 INFO L225 Difference]: With dead ends: 61 [2020-08-21 17:28:47,717 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 17:28:47,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 17:28:47,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 17:28:47,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 17:28:47,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 17:28:47,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 17:28:47,722 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 17:28:47,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:47,722 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 17:28:47,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 17:28:47,723 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 17:28:47,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 17:28:47,723 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:47,723 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:47,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 17:28:47,724 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:47,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:47,724 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 17:28:47,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:47,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1776390436] [2020-08-21 17:28:47,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:47,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:49,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:49,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:49,395 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 17:28:49,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1776390436] [2020-08-21 17:28:49,396 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:49,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 17:28:49,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040508556] [2020-08-21 17:28:49,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 17:28:49,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:49,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 17:28:49,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 17:28:49,397 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 17:28:50,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:50,803 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 17:28:50,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 17:28:50,804 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 17:28:50,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:50,805 INFO L225 Difference]: With dead ends: 62 [2020-08-21 17:28:50,805 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 17:28:50,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 17:28:50,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 17:28:50,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 17:28:50,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 17:28:50,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 17:28:50,810 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 17:28:50,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:50,810 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 17:28:50,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 17:28:50,811 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 17:28:50,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 17:28:50,811 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:50,811 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:50,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 17:28:50,812 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:50,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:50,812 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 17:28:50,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:50,812 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815519749] [2020-08-21 17:28:50,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:50,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:52,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:52,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:52,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:52,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815519749] [2020-08-21 17:28:52,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:52,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 17:28:52,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14062636] [2020-08-21 17:28:52,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 17:28:52,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:52,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 17:28:52,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 17:28:52,465 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-21 17:28:53,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:53,956 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-21 17:28:53,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 17:28:53,957 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-21 17:28:53,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:53,958 INFO L225 Difference]: With dead ends: 63 [2020-08-21 17:28:53,958 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 17:28:53,959 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 17:28:53,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 17:28:53,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 17:28:53,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 17:28:53,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-21 17:28:53,963 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-21 17:28:53,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:53,963 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-21 17:28:53,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 17:28:53,964 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-21 17:28:53,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 17:28:53,964 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:53,964 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:53,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 17:28:53,965 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:53,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:53,965 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-21 17:28:53,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:53,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1794714918] [2020-08-21 17:28:53,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:53,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat