/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER -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 0.1.25-5644d1e-m [2020-08-18 19:37:22,175 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 19:37:22,177 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 19:37:22,201 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 19:37:22,201 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 19:37:22,202 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 19:37:22,203 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 19:37:22,205 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 19:37:22,207 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 19:37:22,208 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 19:37:22,208 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 19:37:22,210 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 19:37:22,210 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 19:37:22,211 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 19:37:22,212 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 19:37:22,213 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 19:37:22,214 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 19:37:22,215 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 19:37:22,216 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 19:37:22,218 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 19:37:22,219 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 19:37:22,222 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 19:37:22,223 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 19:37:22,224 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 19:37:22,228 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 19:37:22,238 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 19:37:22,240 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 19:37:22,241 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 19:37:22,241 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 [2020-08-18 19:37:22,289 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 19:37:22,292 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 19:37:22,293 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 19:37:22,293 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 19:37:22,293 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 19:37:22,293 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 19:37:22,294 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 19:37:22,294 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 19:37:22,294 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 19:37:22,294 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 19:37:22,294 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 19:37:22,294 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 19:37:22,295 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 19:37:22,295 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 19:37:22,295 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 19:37:22,295 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 19:37:22,295 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 19:37:22,296 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 19:37:22,297 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 19:37:22,297 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 19:37:22,297 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 19:37:22,297 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 19:37:22,297 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 19:37:22,298 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 19:37:22,298 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 19:37:22,298 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 19:37:22,298 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 19:37:22,298 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 19:37:22,298 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 19:37:22,299 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=5;interpolation-heuristic=HIGHLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=HIGHLEXORDER; [2020-08-18 19:37:22,616 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 19:37:22,633 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 19:37:22,636 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 19:37:22,637 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 19:37:22,638 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 19:37:22,638 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-18 19:37:22,698 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e796b3771/39f8c7d70ad54ef4a48c02cf08450fd1/FLAG7c3c6b9d5 [2020-08-18 19:37:23,113 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 19:37:23,115 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-18 19:37:23,122 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e796b3771/39f8c7d70ad54ef4a48c02cf08450fd1/FLAG7c3c6b9d5 [2020-08-18 19:37:23,481 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e796b3771/39f8c7d70ad54ef4a48c02cf08450fd1 [2020-08-18 19:37:23,491 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 19:37:23,493 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 19:37:23,494 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 19:37:23,494 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 19:37:23,498 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 19:37:23,499 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:37:23" (1/1) ... [2020-08-18 19:37:23,502 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72dcb5c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:23, skipping insertion in model container [2020-08-18 19:37:23,502 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:37:23" (1/1) ... [2020-08-18 19:37:23,510 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 19:37:23,527 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 19:37:23,725 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:37:23,729 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 19:37:23,744 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:37:23,760 INFO L208 MainTranslator]: Completed translation [2020-08-18 19:37:23,760 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:23 WrapperNode [2020-08-18 19:37:23,761 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 19:37:23,762 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 19:37:23,762 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 19:37:23,762 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 19:37:23,776 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:23" (1/1) ... [2020-08-18 19:37:23,777 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:23" (1/1) ... [2020-08-18 19:37:23,871 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:23" (1/1) ... [2020-08-18 19:37:23,871 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:23" (1/1) ... [2020-08-18 19:37:23,874 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:23" (1/1) ... [2020-08-18 19:37:23,878 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:23" (1/1) ... [2020-08-18 19:37:23,878 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:23" (1/1) ... [2020-08-18 19:37:23,879 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 19:37:23,880 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 19:37:23,880 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 19:37:23,880 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 19:37:23,881 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:23" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 19:37:23,947 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 19:37:23,948 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 19:37:23,948 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 19:37:23,948 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 19:37:23,948 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 19:37:23,949 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 19:37:23,949 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 19:37:23,949 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 19:37:23,949 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 19:37:24,135 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 19:37:24,136 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 19:37:24,140 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:37:24 BoogieIcfgContainer [2020-08-18 19:37:24,141 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 19:37:24,142 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 19:37:24,142 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 19:37:24,145 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 19:37:24,146 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 07:37:23" (1/3) ... [2020-08-18 19:37:24,147 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@428e5bd0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:37:24, skipping insertion in model container [2020-08-18 19:37:24,147 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:23" (2/3) ... [2020-08-18 19:37:24,147 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@428e5bd0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:37:24, skipping insertion in model container [2020-08-18 19:37:24,148 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:37:24" (3/3) ... [2020-08-18 19:37:24,150 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-18 19:37:24,160 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 19:37:24,167 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 19:37:24,183 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 19:37:24,207 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 19:37:24,208 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 19:37:24,208 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 19:37:24,208 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 19:37:24,208 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 19:37:24,208 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 19:37:24,208 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 19:37:24,209 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 19:37:24,225 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 19:37:24,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 19:37:24,231 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:24,232 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:24,233 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:24,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:24,238 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 19:37:24,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:24,246 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548120294] [2020-08-18 19:37:24,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:24,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:24,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:24,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548120294] [2020-08-18 19:37:24,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:24,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 19:37:24,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879588368] [2020-08-18 19:37:24,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 19:37:24,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:24,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 19:37:24,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 19:37:24,483 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 19:37:24,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:24,555 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 19:37:24,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 19:37:24,558 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 19:37:24,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:24,577 INFO L225 Difference]: With dead ends: 29 [2020-08-18 19:37:24,578 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 19:37:24,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 19:37:24,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 19:37:24,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 19:37:24,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 19:37:24,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 19:37:24,619 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 19:37:24,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:24,620 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 19:37:24,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 19:37:24,620 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 19:37:24,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 19:37:24,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:24,621 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:24,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 19:37:24,622 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:24,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:24,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 19:37:24,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:24,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998539426] [2020-08-18 19:37:24,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:24,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:24,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:24,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998539426] [2020-08-18 19:37:24,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:24,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 19:37:24,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336076466] [2020-08-18 19:37:24,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 19:37:24,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:24,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 19:37:24,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 19:37:24,723 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 19:37:24,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:24,744 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 19:37:24,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 19:37:24,745 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 19:37:24,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:24,746 INFO L225 Difference]: With dead ends: 18 [2020-08-18 19:37:24,746 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 19:37:24,747 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 [2020-08-18 19:37:24,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 19:37:24,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 19:37:24,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 19:37:24,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 19:37:24,753 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 19:37:24,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:24,753 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 19:37:24,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 19:37:24,754 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 19:37:24,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 19:37:24,754 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:24,754 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:24,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 19:37:24,755 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:24,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:24,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 19:37:24,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:24,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [406739472] [2020-08-18 19:37:24,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:24,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:24,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,874 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:24,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [406739472] [2020-08-18 19:37:24,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:24,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 19:37:24,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959243662] [2020-08-18 19:37:24,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 19:37:24,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:24,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 19:37:24,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:37:24,877 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 19:37:24,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:24,900 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 19:37:24,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 19:37:24,901 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 19:37:24,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:24,902 INFO L225 Difference]: With dead ends: 19 [2020-08-18 19:37:24,902 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 19:37:24,903 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 [2020-08-18 19:37:24,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 19:37:24,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 19:37:24,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 19:37:24,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 19:37:24,909 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 19:37:24,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:24,909 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 19:37:24,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 19:37:24,910 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 19:37:24,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 19:37:24,910 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:24,911 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:24,911 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 19:37:24,911 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:24,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:24,912 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 19:37:24,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:24,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1219933594] [2020-08-18 19:37:24,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:24,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:25,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,022 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:25,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1219933594] [2020-08-18 19:37:25,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:25,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 19:37:25,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493102729] [2020-08-18 19:37:25,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 19:37:25,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:25,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 19:37:25,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 19:37:25,024 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 19:37:25,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:25,053 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 19:37:25,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 19:37:25,053 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 19:37:25,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:25,054 INFO L225 Difference]: With dead ends: 20 [2020-08-18 19:37:25,054 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 19:37:25,055 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 [2020-08-18 19:37:25,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 19:37:25,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 19:37:25,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 19:37:25,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 19:37:25,061 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 19:37:25,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:25,061 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 19:37:25,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 19:37:25,061 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 19:37:25,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 19:37:25,062 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:25,062 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:25,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 19:37:25,063 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:25,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:25,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 19:37:25,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:25,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1393816353] [2020-08-18 19:37:25,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:25,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:25,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,172 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:25,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1393816353] [2020-08-18 19:37:25,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:25,173 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 19:37:25,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681081550] [2020-08-18 19:37:25,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 19:37:25,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:25,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 19:37:25,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 19:37:25,176 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 19:37:25,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:25,215 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 19:37:25,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 19:37:25,216 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 19:37:25,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:25,217 INFO L225 Difference]: With dead ends: 21 [2020-08-18 19:37:25,217 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 19:37:25,218 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 [2020-08-18 19:37:25,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 19:37:25,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 19:37:25,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 19:37:25,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 19:37:25,224 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 19:37:25,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:25,225 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 19:37:25,225 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 19:37:25,225 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 19:37:25,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 19:37:25,226 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:25,226 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:25,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 19:37:25,227 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:25,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:25,227 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 19:37:25,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:25,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047298417] [2020-08-18 19:37:25,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:25,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:25,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,383 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:25,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047298417] [2020-08-18 19:37:25,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:25,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 19:37:25,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535253014] [2020-08-18 19:37:25,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 19:37:25,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:25,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 19:37:25,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 19:37:25,388 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 19:37:25,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:25,456 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 19:37:25,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 19:37:25,458 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 19:37:25,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:25,459 INFO L225 Difference]: With dead ends: 22 [2020-08-18 19:37:25,459 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 19:37:25,463 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 [2020-08-18 19:37:25,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 19:37:25,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 19:37:25,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 19:37:25,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 19:37:25,471 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 19:37:25,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:25,475 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 19:37:25,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 19:37:25,475 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 19:37:25,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 19:37:25,479 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:25,479 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:25,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 19:37:25,480 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:25,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:25,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 19:37:25,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:25,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [128563797] [2020-08-18 19:37:25,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:25,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:25,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,668 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:25,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [128563797] [2020-08-18 19:37:25,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:25,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 19:37:25,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711740825] [2020-08-18 19:37:25,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 19:37:25,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:25,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 19:37:25,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 19:37:25,671 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-18 19:37:25,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:25,721 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 19:37:25,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 19:37:25,722 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-18 19:37:25,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:25,723 INFO L225 Difference]: With dead ends: 23 [2020-08-18 19:37:25,723 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 19:37:25,724 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 [2020-08-18 19:37:25,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 19:37:25,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 19:37:25,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 19:37:25,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-18 19:37:25,729 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-18 19:37:25,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:25,730 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-18 19:37:25,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 19:37:25,730 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-18 19:37:25,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 19:37:25,731 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:25,731 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:25,731 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 19:37:25,731 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:25,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:25,732 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-18 19:37:25,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:25,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1823295934] [2020-08-18 19:37:25,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:25,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:25,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,872 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:25,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1823295934] [2020-08-18 19:37:25,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:25,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 19:37:25,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721383055] [2020-08-18 19:37:25,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 19:37:25,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:25,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 19:37:25,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 19:37:25,874 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-18 19:37:25,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:25,928 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 19:37:25,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 19:37:25,928 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-18 19:37:25,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:25,929 INFO L225 Difference]: With dead ends: 24 [2020-08-18 19:37:25,929 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 19:37:25,930 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 [2020-08-18 19:37:25,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 19:37:25,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 19:37:25,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 19:37:25,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 19:37:25,935 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-18 19:37:25,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:25,935 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 19:37:25,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 19:37:25,936 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 19:37:25,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 19:37:25,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:25,937 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:25,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 19:37:25,937 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:25,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:25,938 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-18 19:37:25,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:25,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1443154576] [2020-08-18 19:37:25,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:25,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:26,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,100 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:26,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1443154576] [2020-08-18 19:37:26,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:26,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 19:37:26,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101500112] [2020-08-18 19:37:26,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 19:37:26,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:26,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 19:37:26,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 19:37:26,102 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-18 19:37:26,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:26,178 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 19:37:26,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 19:37:26,179 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-18 19:37:26,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:26,179 INFO L225 Difference]: With dead ends: 25 [2020-08-18 19:37:26,180 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 19:37:26,180 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 [2020-08-18 19:37:26,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 19:37:26,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 19:37:26,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 19:37:26,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 19:37:26,186 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-18 19:37:26,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:26,187 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 19:37:26,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 19:37:26,187 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 19:37:26,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 19:37:26,188 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:26,188 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:26,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 19:37:26,189 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:26,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:26,189 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-18 19:37:26,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:26,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [294286551] [2020-08-18 19:37:26,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:26,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:26,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,365 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:26,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [294286551] [2020-08-18 19:37:26,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:26,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 19:37:26,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148728852] [2020-08-18 19:37:26,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 19:37:26,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:26,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 19:37:26,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 19:37:26,368 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-18 19:37:26,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:26,455 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 19:37:26,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 19:37:26,456 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-18 19:37:26,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:26,457 INFO L225 Difference]: With dead ends: 26 [2020-08-18 19:37:26,457 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 19:37:26,457 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 [2020-08-18 19:37:26,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 19:37:26,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 19:37:26,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 19:37:26,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 19:37:26,462 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-18 19:37:26,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:26,463 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 19:37:26,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 19:37:26,463 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 19:37:26,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 19:37:26,464 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:26,464 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:26,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 19:37:26,464 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:26,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:26,465 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-18 19:37:26,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:26,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [688462735] [2020-08-18 19:37:26,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:26,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:26,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,657 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:26,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [688462735] [2020-08-18 19:37:26,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:26,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 19:37:26,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246062066] [2020-08-18 19:37:26,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 19:37:26,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:26,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 19:37:26,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 19:37:26,659 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-18 19:37:26,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:26,762 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 19:37:26,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 19:37:26,763 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-18 19:37:26,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:26,764 INFO L225 Difference]: With dead ends: 27 [2020-08-18 19:37:26,764 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 19:37:26,764 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 [2020-08-18 19:37:26,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 19:37:26,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 19:37:26,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 19:37:26,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 19:37:26,770 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-18 19:37:26,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:26,770 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 19:37:26,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 19:37:26,770 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 19:37:26,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 19:37:26,771 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:26,771 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:26,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 19:37:26,772 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:26,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:26,772 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-18 19:37:26,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:26,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [172401890] [2020-08-18 19:37:26,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:26,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:26,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,979 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:26,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [172401890] [2020-08-18 19:37:26,980 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:26,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 19:37:26,981 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867434981] [2020-08-18 19:37:26,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 19:37:26,982 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:26,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 19:37:26,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 19:37:26,983 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-18 19:37:27,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:27,090 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 19:37:27,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 19:37:27,091 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-18 19:37:27,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:27,092 INFO L225 Difference]: With dead ends: 28 [2020-08-18 19:37:27,092 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 19:37:27,092 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 [2020-08-18 19:37:27,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 19:37:27,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 19:37:27,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 19:37:27,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 19:37:27,099 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-18 19:37:27,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:27,099 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 19:37:27,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 19:37:27,099 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 19:37:27,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 19:37:27,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:27,102 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:27,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 19:37:27,102 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:27,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:27,103 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-18 19:37:27,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:27,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2037314209] [2020-08-18 19:37:27,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:27,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:27,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:27,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:27,341 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:27,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2037314209] [2020-08-18 19:37:27,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:27,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 19:37:27,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675515662] [2020-08-18 19:37:27,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 19:37:27,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:27,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 19:37:27,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 19:37:27,345 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-18 19:37:27,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:27,460 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 19:37:27,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 19:37:27,463 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-18 19:37:27,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:27,463 INFO L225 Difference]: With dead ends: 29 [2020-08-18 19:37:27,463 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 19:37:27,464 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 [2020-08-18 19:37:27,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 19:37:27,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 19:37:27,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 19:37:27,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-18 19:37:27,470 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-18 19:37:27,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:27,471 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-18 19:37:27,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 19:37:27,471 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-18 19:37:27,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 19:37:27,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:27,472 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:27,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 19:37:27,473 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:27,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:27,473 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-18 19:37:27,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:27,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911365545] [2020-08-18 19:37:27,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:27,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:27,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:27,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:27,735 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:27,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911365545] [2020-08-18 19:37:27,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:27,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 19:37:27,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203224166] [2020-08-18 19:37:27,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 19:37:27,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:27,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 19:37:27,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 19:37:27,738 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-18 19:37:27,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:27,877 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 19:37:27,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 19:37:27,877 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-18 19:37:27,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:27,878 INFO L225 Difference]: With dead ends: 30 [2020-08-18 19:37:27,878 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 19:37:27,879 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 [2020-08-18 19:37:27,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 19:37:27,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 19:37:27,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 19:37:27,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 19:37:27,887 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-18 19:37:27,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:27,888 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 19:37:27,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 19:37:27,888 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 19:37:27,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 19:37:27,890 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:27,890 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:27,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 19:37:27,890 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:27,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:27,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-18 19:37:27,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:27,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1674499794] [2020-08-18 19:37:27,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:27,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:28,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:28,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:28,160 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:28,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1674499794] [2020-08-18 19:37:28,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:28,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 19:37:28,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921307733] [2020-08-18 19:37:28,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 19:37:28,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:28,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 19:37:28,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 19:37:28,163 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-18 19:37:28,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:28,308 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 19:37:28,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 19:37:28,309 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-18 19:37:28,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:28,309 INFO L225 Difference]: With dead ends: 31 [2020-08-18 19:37:28,309 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 19:37:28,310 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 [2020-08-18 19:37:28,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 19:37:28,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 19:37:28,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 19:37:28,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 19:37:28,315 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-18 19:37:28,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:28,315 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 19:37:28,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 19:37:28,316 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 19:37:28,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 19:37:28,316 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:28,317 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:28,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 19:37:28,317 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:28,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:28,317 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-18 19:37:28,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:28,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126341580] [2020-08-18 19:37:28,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:28,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:28,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:28,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:28,572 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:28,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126341580] [2020-08-18 19:37:28,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:28,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 19:37:28,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108406039] [2020-08-18 19:37:28,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 19:37:28,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:28,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 19:37:28,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 19:37:28,574 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-18 19:37:28,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:28,746 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 19:37:28,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 19:37:28,747 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-18 19:37:28,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:28,748 INFO L225 Difference]: With dead ends: 32 [2020-08-18 19:37:28,748 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 19:37:28,749 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 [2020-08-18 19:37:28,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 19:37:28,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 19:37:28,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 19:37:28,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 19:37:28,753 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-18 19:37:28,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:28,753 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 19:37:28,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 19:37:28,754 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 19:37:28,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 19:37:28,754 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:28,754 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:28,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 19:37:28,755 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:28,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:28,755 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-18 19:37:28,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:28,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1843524497] [2020-08-18 19:37:28,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:28,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:29,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:29,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:29,085 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:29,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1843524497] [2020-08-18 19:37:29,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:29,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 19:37:29,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097911520] [2020-08-18 19:37:29,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 19:37:29,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:29,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 19:37:29,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 19:37:29,087 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-18 19:37:29,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:29,308 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-18 19:37:29,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 19:37:29,310 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-18 19:37:29,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:29,311 INFO L225 Difference]: With dead ends: 33 [2020-08-18 19:37:29,311 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 19:37:29,311 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 [2020-08-18 19:37:29,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 19:37:29,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 19:37:29,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 19:37:29,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-18 19:37:29,316 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-18 19:37:29,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:29,316 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-18 19:37:29,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 19:37:29,316 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-18 19:37:29,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 19:37:29,317 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:29,317 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:29,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 19:37:29,317 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:29,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:29,318 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-18 19:37:29,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:29,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [118493095] [2020-08-18 19:37:29,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:29,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:29,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:29,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:29,635 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:29,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [118493095] [2020-08-18 19:37:29,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:29,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 19:37:29,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080640873] [2020-08-18 19:37:29,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 19:37:29,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:29,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 19:37:29,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 19:37:29,637 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-18 19:37:29,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:29,862 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 19:37:29,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 19:37:29,863 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-18 19:37:29,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:29,864 INFO L225 Difference]: With dead ends: 34 [2020-08-18 19:37:29,864 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 19:37:29,864 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 [2020-08-18 19:37:29,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 19:37:29,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 19:37:29,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 19:37:29,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 19:37:29,869 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-18 19:37:29,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:29,869 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 19:37:29,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 19:37:29,870 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 19:37:29,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 19:37:29,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:29,870 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:29,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 19:37:29,871 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:29,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:29,871 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-18 19:37:29,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:29,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079491156] [2020-08-18 19:37:29,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:29,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:30,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:30,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:30,245 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:30,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079491156] [2020-08-18 19:37:30,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:30,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 19:37:30,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192925983] [2020-08-18 19:37:30,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 19:37:30,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:30,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 19:37:30,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 19:37:30,248 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-18 19:37:30,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:30,468 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 19:37:30,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 19:37:30,470 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-18 19:37:30,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:30,470 INFO L225 Difference]: With dead ends: 35 [2020-08-18 19:37:30,470 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 19:37:30,471 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 [2020-08-18 19:37:30,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 19:37:30,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 19:37:30,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 19:37:30,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-18 19:37:30,475 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-18 19:37:30,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:30,475 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-18 19:37:30,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 19:37:30,476 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-18 19:37:30,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 19:37:30,476 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:30,476 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:30,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 19:37:30,477 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:30,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:30,477 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-18 19:37:30,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:30,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402237648] [2020-08-18 19:37:30,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:30,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:30,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:30,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:30,833 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:30,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402237648] [2020-08-18 19:37:30,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:30,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 19:37:30,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101562110] [2020-08-18 19:37:30,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 19:37:30,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:30,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 19:37:30,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 19:37:30,835 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-18 19:37:31,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:31,103 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 19:37:31,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 19:37:31,104 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-18 19:37:31,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:31,105 INFO L225 Difference]: With dead ends: 36 [2020-08-18 19:37:31,105 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 19:37:31,106 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 [2020-08-18 19:37:31,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 19:37:31,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 19:37:31,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 19:37:31,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 19:37:31,114 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-18 19:37:31,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:31,114 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 19:37:31,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 19:37:31,115 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 19:37:31,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 19:37:31,116 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:31,116 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:31,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 19:37:31,117 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:31,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:31,117 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-18 19:37:31,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:31,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079121424] [2020-08-18 19:37:31,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:31,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:31,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:31,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:31,585 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:31,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079121424] [2020-08-18 19:37:31,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:31,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 19:37:31,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432866595] [2020-08-18 19:37:31,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 19:37:31,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:31,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 19:37:31,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 19:37:31,588 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-18 19:37:31,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:31,896 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-18 19:37:31,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 19:37:31,896 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-18 19:37:31,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:31,897 INFO L225 Difference]: With dead ends: 37 [2020-08-18 19:37:31,897 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 19:37:31,898 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 19:37:31,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 19:37:31,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 19:37:31,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 19:37:31,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 19:37:31,903 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-18 19:37:31,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:31,903 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 19:37:31,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 19:37:31,903 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 19:37:31,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 19:37:31,904 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:31,904 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:31,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 19:37:31,904 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:31,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:31,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-18 19:37:31,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:31,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [989008550] [2020-08-18 19:37:31,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:31,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:32,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:32,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:32,352 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:32,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [989008550] [2020-08-18 19:37:32,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:32,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 19:37:32,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515828636] [2020-08-18 19:37:32,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 19:37:32,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:32,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 19:37:32,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 19:37:32,354 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-18 19:37:32,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:32,662 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 19:37:32,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 19:37:32,664 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-18 19:37:32,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:32,664 INFO L225 Difference]: With dead ends: 38 [2020-08-18 19:37:32,664 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 19:37:32,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 19:37:32,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 19:37:32,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 19:37:32,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 19:37:32,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 19:37:32,674 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-18 19:37:32,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:32,674 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 19:37:32,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 19:37:32,674 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 19:37:32,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 19:37:32,675 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:32,675 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:32,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 19:37:32,676 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:32,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:32,676 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-18 19:37:32,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:32,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2123139220] [2020-08-18 19:37:32,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:32,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:33,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:33,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:33,147 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:33,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2123139220] [2020-08-18 19:37:33,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:33,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 19:37:33,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676500515] [2020-08-18 19:37:33,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 19:37:33,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:33,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 19:37:33,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 19:37:33,149 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-18 19:37:33,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:33,541 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-18 19:37:33,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 19:37:33,541 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-18 19:37:33,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:33,542 INFO L225 Difference]: With dead ends: 39 [2020-08-18 19:37:33,542 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 19:37:33,543 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 [2020-08-18 19:37:33,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 19:37:33,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 19:37:33,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 19:37:33,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-18 19:37:33,549 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-18 19:37:33,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:33,549 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-18 19:37:33,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 19:37:33,549 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-18 19:37:33,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 19:37:33,550 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:33,550 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:33,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 19:37:33,550 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:33,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:33,551 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-18 19:37:33,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:33,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [306240707] [2020-08-18 19:37:33,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:33,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:33,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:33,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:33,993 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:33,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [306240707] [2020-08-18 19:37:33,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:33,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 19:37:33,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274863265] [2020-08-18 19:37:33,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 19:37:33,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:33,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 19:37:33,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 19:37:33,995 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-18 19:37:34,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:34,386 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 19:37:34,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 19:37:34,394 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-18 19:37:34,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:34,395 INFO L225 Difference]: With dead ends: 40 [2020-08-18 19:37:34,395 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 19:37:34,396 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 [2020-08-18 19:37:34,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 19:37:34,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 19:37:34,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 19:37:34,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 19:37:34,401 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-18 19:37:34,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:34,402 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 19:37:34,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 19:37:34,402 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 19:37:34,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 19:37:34,403 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:34,403 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:34,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 19:37:34,406 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:34,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:34,407 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-18 19:37:34,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:34,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179359619] [2020-08-18 19:37:34,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:34,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:34,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:34,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:34,966 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:34,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179359619] [2020-08-18 19:37:34,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:34,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 19:37:34,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20278952] [2020-08-18 19:37:34,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 19:37:34,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:34,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 19:37:34,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 19:37:34,968 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-18 19:37:35,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:35,339 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 19:37:35,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 19:37:35,340 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-18 19:37:35,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:35,341 INFO L225 Difference]: With dead ends: 41 [2020-08-18 19:37:35,341 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 19:37:35,341 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 19:37:35,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 19:37:35,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 19:37:35,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 19:37:35,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-18 19:37:35,346 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-18 19:37:35,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:35,346 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-18 19:37:35,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 19:37:35,346 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-18 19:37:35,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 19:37:35,347 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:35,347 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:35,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 19:37:35,348 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:35,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:35,348 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-18 19:37:35,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:35,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2060131811] [2020-08-18 19:37:35,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:35,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:35,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:35,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:35,892 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:35,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2060131811] [2020-08-18 19:37:35,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:35,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 19:37:35,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717722251] [2020-08-18 19:37:35,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 19:37:35,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:35,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 19:37:35,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 19:37:35,901 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-18 19:37:36,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:36,353 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 19:37:36,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 19:37:36,353 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-18 19:37:36,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:36,354 INFO L225 Difference]: With dead ends: 42 [2020-08-18 19:37:36,354 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 19:37:36,355 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 [2020-08-18 19:37:36,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 19:37:36,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 19:37:36,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 19:37:36,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 19:37:36,359 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-18 19:37:36,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:36,359 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 19:37:36,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 19:37:36,360 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 19:37:36,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 19:37:36,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:36,360 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:36,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 19:37:36,361 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:36,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:36,361 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-18 19:37:36,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:36,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1276269104] [2020-08-18 19:37:36,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:36,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:36,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:36,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:36,938 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:36,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1276269104] [2020-08-18 19:37:36,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:36,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 19:37:36,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692981202] [2020-08-18 19:37:36,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 19:37:36,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:36,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 19:37:36,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 19:37:36,940 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-18 19:37:37,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:37,418 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-18 19:37:37,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 19:37:37,422 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-18 19:37:37,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:37,423 INFO L225 Difference]: With dead ends: 43 [2020-08-18 19:37:37,424 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 19:37:37,424 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 [2020-08-18 19:37:37,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 19:37:37,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 19:37:37,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 19:37:37,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 19:37:37,432 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-18 19:37:37,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:37,432 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 19:37:37,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 19:37:37,432 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 19:37:37,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 19:37:37,433 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:37,433 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:37,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 19:37:37,433 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:37,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:37,434 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-18 19:37:37,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:37,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1152945741] [2020-08-18 19:37:37,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:37,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:38,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:38,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:38,107 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:38,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1152945741] [2020-08-18 19:37:38,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:38,108 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 19:37:38,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035822153] [2020-08-18 19:37:38,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 19:37:38,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:38,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 19:37:38,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 19:37:38,109 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-18 19:37:38,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:38,597 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 19:37:38,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 19:37:38,598 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-18 19:37:38,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:38,599 INFO L225 Difference]: With dead ends: 44 [2020-08-18 19:37:38,599 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 19:37:38,600 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 [2020-08-18 19:37:38,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 19:37:38,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 19:37:38,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 19:37:38,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 19:37:38,605 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-18 19:37:38,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:38,605 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 19:37:38,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 19:37:38,605 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 19:37:38,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 19:37:38,606 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:38,606 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:38,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 19:37:38,606 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:38,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:38,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-18 19:37:38,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:38,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011562940] [2020-08-18 19:37:38,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:38,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:39,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:39,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:39,360 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:39,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011562940] [2020-08-18 19:37:39,361 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:39,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 19:37:39,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773393783] [2020-08-18 19:37:39,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 19:37:39,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:39,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 19:37:39,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 19:37:39,362 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-18 19:37:39,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:39,920 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-18 19:37:39,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 19:37:39,920 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-18 19:37:39,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:39,921 INFO L225 Difference]: With dead ends: 45 [2020-08-18 19:37:39,921 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 19:37:39,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 19:37:39,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 19:37:39,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 19:37:39,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 19:37:39,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-18 19:37:39,926 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-18 19:37:39,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:39,926 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-18 19:37:39,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 19:37:39,926 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-18 19:37:39,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 19:37:39,927 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:39,927 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:39,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 19:37:39,927 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:39,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:39,928 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-18 19:37:39,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:39,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [415989285] [2020-08-18 19:37:39,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:39,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:40,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:40,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:40,678 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:40,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [415989285] [2020-08-18 19:37:40,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:40,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 19:37:40,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615722254] [2020-08-18 19:37:40,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 19:37:40,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:40,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 19:37:40,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 19:37:40,680 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-18 19:37:41,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:41,272 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 19:37:41,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 19:37:41,273 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-18 19:37:41,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:41,273 INFO L225 Difference]: With dead ends: 46 [2020-08-18 19:37:41,274 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 19:37:41,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 19:37:41,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 19:37:41,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 19:37:41,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 19:37:41,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 19:37:41,280 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-18 19:37:41,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:41,280 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 19:37:41,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 19:37:41,280 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 19:37:41,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 19:37:41,281 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:41,281 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:41,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 19:37:41,281 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:41,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:41,282 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-18 19:37:41,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:41,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155653170] [2020-08-18 19:37:41,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:41,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:42,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:42,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:42,051 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:42,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155653170] [2020-08-18 19:37:42,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:42,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 19:37:42,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407836826] [2020-08-18 19:37:42,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 19:37:42,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:42,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 19:37:42,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 19:37:42,052 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-18 19:37:42,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:42,673 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 19:37:42,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 19:37:42,675 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-18 19:37:42,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:42,676 INFO L225 Difference]: With dead ends: 47 [2020-08-18 19:37:42,676 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 19:37:42,677 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 [2020-08-18 19:37:42,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 19:37:42,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 19:37:42,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 19:37:42,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-18 19:37:42,681 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-18 19:37:42,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:42,681 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-18 19:37:42,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 19:37:42,681 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-18 19:37:42,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 19:37:42,682 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:42,682 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:42,682 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 19:37:42,682 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:42,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:42,682 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-18 19:37:42,683 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:42,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [537862746] [2020-08-18 19:37:42,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:42,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:43,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:43,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:43,535 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:43,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [537862746] [2020-08-18 19:37:43,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:43,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 19:37:43,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515880165] [2020-08-18 19:37:43,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 19:37:43,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:43,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 19:37:43,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 19:37:43,537 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-18 19:37:44,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:44,182 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 19:37:44,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 19:37:44,183 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-18 19:37:44,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:44,184 INFO L225 Difference]: With dead ends: 48 [2020-08-18 19:37:44,184 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 19:37:44,185 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 [2020-08-18 19:37:44,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 19:37:44,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 19:37:44,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 19:37:44,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 19:37:44,189 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-18 19:37:44,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:44,190 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 19:37:44,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 19:37:44,190 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 19:37:44,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 19:37:44,190 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:44,191 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:44,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 19:37:44,191 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:44,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:44,191 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-18 19:37:44,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:44,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279754980] [2020-08-18 19:37:44,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:44,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:45,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:45,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:45,085 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:45,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1279754980] [2020-08-18 19:37:45,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:45,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 19:37:45,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948139820] [2020-08-18 19:37:45,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 19:37:45,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:45,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 19:37:45,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 19:37:45,087 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-18 19:37:45,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:45,810 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-18 19:37:45,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 19:37:45,811 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-18 19:37:45,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:45,812 INFO L225 Difference]: With dead ends: 49 [2020-08-18 19:37:45,812 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 19:37:45,813 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 [2020-08-18 19:37:45,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 19:37:45,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 19:37:45,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 19:37:45,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 19:37:45,817 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-18 19:37:45,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:45,817 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 19:37:45,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 19:37:45,818 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 19:37:45,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 19:37:45,818 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:45,818 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:45,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 19:37:45,819 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:45,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:45,819 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-18 19:37:45,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:45,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [874880174] [2020-08-18 19:37:45,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:45,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:46,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:46,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:46,762 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:46,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [874880174] [2020-08-18 19:37:46,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:46,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 19:37:46,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668252529] [2020-08-18 19:37:46,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 19:37:46,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:46,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 19:37:46,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 19:37:46,764 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-18 19:37:47,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:47,527 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 19:37:47,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 19:37:47,527 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-18 19:37:47,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:47,528 INFO L225 Difference]: With dead ends: 50 [2020-08-18 19:37:47,528 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 19:37:47,529 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 [2020-08-18 19:37:47,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 19:37:47,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 19:37:47,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 19:37:47,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 19:37:47,533 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-18 19:37:47,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:47,533 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 19:37:47,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 19:37:47,533 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 19:37:47,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 19:37:47,534 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:47,534 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:47,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 19:37:47,534 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:47,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:47,535 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-18 19:37:47,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:47,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460122685] [2020-08-18 19:37:47,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:47,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:48,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:48,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:48,499 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:48,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460122685] [2020-08-18 19:37:48,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:48,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 19:37:48,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206571890] [2020-08-18 19:37:48,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 19:37:48,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:48,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 19:37:48,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 19:37:48,501 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-18 19:37:49,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:49,324 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-18 19:37:49,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 19:37:49,325 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-18 19:37:49,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:49,325 INFO L225 Difference]: With dead ends: 51 [2020-08-18 19:37:49,325 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 19:37:49,326 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 19:37:49,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 19:37:49,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 19:37:49,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 19:37:49,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-18 19:37:49,330 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-18 19:37:49,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:49,331 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-18 19:37:49,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 19:37:49,331 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-18 19:37:49,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 19:37:49,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:49,332 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:49,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 19:37:49,332 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:49,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:49,332 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-18 19:37:49,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:49,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1103974202] [2020-08-18 19:37:49,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:49,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:50,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:50,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:50,369 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:50,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1103974202] [2020-08-18 19:37:50,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:50,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 19:37:50,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390328890] [2020-08-18 19:37:50,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 19:37:50,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:50,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 19:37:50,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 19:37:50,371 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-18 19:37:51,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:51,217 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 19:37:51,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 19:37:51,218 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-18 19:37:51,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:51,219 INFO L225 Difference]: With dead ends: 52 [2020-08-18 19:37:51,219 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 19:37:51,219 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 [2020-08-18 19:37:51,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 19:37:51,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 19:37:51,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 19:37:51,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 19:37:51,223 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-18 19:37:51,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:51,224 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 19:37:51,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 19:37:51,224 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 19:37:51,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 19:37:51,224 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:51,225 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:51,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 19:37:51,225 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:51,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:51,225 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-18 19:37:51,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:51,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [867696055] [2020-08-18 19:37:51,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:51,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:52,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:52,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:52,281 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:52,281 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [867696055] [2020-08-18 19:37:52,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:52,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 19:37:52,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136470621] [2020-08-18 19:37:52,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 19:37:52,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:52,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 19:37:52,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 19:37:52,283 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-18 19:37:53,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:53,207 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 19:37:53,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 19:37:53,208 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-18 19:37:53,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:53,209 INFO L225 Difference]: With dead ends: 53 [2020-08-18 19:37:53,209 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 19:37:53,210 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 19:37:53,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 19:37:53,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 19:37:53,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 19:37:53,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-18 19:37:53,214 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-18 19:37:53,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:53,214 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-18 19:37:53,214 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 19:37:53,215 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-18 19:37:53,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 19:37:53,215 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:53,215 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:53,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 19:37:53,215 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:53,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:53,216 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-18 19:37:53,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:53,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1102480486] [2020-08-18 19:37:53,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:53,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:54,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:54,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:54,334 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:54,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1102480486] [2020-08-18 19:37:54,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:54,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 19:37:54,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810166149] [2020-08-18 19:37:54,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 19:37:54,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:54,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 19:37:54,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 19:37:54,336 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-18 19:37:55,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:55,304 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 19:37:55,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 19:37:55,305 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-18 19:37:55,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:55,306 INFO L225 Difference]: With dead ends: 54 [2020-08-18 19:37:55,306 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 19:37:55,307 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 [2020-08-18 19:37:55,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 19:37:55,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 19:37:55,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 19:37:55,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 19:37:55,311 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-18 19:37:55,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:55,311 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 19:37:55,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 19:37:55,311 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 19:37:55,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 19:37:55,312 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:55,312 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:55,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 19:37:55,312 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:55,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:55,313 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-18 19:37:55,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:55,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623417946] [2020-08-18 19:37:55,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:55,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:56,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:56,475 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:56,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623417946] [2020-08-18 19:37:56,476 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:56,476 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 19:37:56,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835186693] [2020-08-18 19:37:56,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 19:37:56,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:56,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 19:37:56,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 19:37:56,477 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-18 19:37:57,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:57,493 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-18 19:37:57,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 19:37:57,494 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-18 19:37:57,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:57,495 INFO L225 Difference]: With dead ends: 55 [2020-08-18 19:37:57,495 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 19:37:57,496 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 [2020-08-18 19:37:57,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 19:37:57,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 19:37:57,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 19:37:57,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-18 19:37:57,500 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-18 19:37:57,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:57,500 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-18 19:37:57,501 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 19:37:57,501 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-18 19:37:57,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 19:37:57,501 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:57,501 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:57,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 19:37:57,501 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:57,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:57,502 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-18 19:37:57,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:57,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244376089] [2020-08-18 19:37:57,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:57,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:58,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:58,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:58,715 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:58,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244376089] [2020-08-18 19:37:58,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:58,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 19:37:58,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169421220] [2020-08-18 19:37:58,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 19:37:58,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:58,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 19:37:58,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 19:37:58,719 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-18 19:37:59,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:59,727 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 19:37:59,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 19:37:59,728 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-18 19:37:59,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:59,729 INFO L225 Difference]: With dead ends: 56 [2020-08-18 19:37:59,729 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 19:37:59,730 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 [2020-08-18 19:37:59,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 19:37:59,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 19:37:59,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 19:37:59,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 19:37:59,733 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-18 19:37:59,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:59,733 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 19:37:59,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 19:37:59,733 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 19:37:59,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 19:37:59,734 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:59,734 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:59,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 19:37:59,734 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:59,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:59,734 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-18 19:37:59,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:59,734 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [556523571] [2020-08-18 19:37:59,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:59,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:01,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:01,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:01,012 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:01,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [556523571] [2020-08-18 19:38:01,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:01,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 19:38:01,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14914608] [2020-08-18 19:38:01,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 19:38:01,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:01,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 19:38:01,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 19:38:01,014 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-18 19:38:02,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:02,092 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-18 19:38:02,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 19:38:02,093 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-18 19:38:02,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:02,094 INFO L225 Difference]: With dead ends: 57 [2020-08-18 19:38:02,094 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 19:38:02,095 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 [2020-08-18 19:38:02,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 19:38:02,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 19:38:02,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 19:38:02,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-18 19:38:02,100 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-18 19:38:02,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:02,100 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-18 19:38:02,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 19:38:02,100 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-18 19:38:02,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 19:38:02,101 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:02,101 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:02,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 19:38:02,103 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:02,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:02,103 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-18 19:38:02,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:02,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913708210] [2020-08-18 19:38:02,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:02,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:03,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:03,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:03,426 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:03,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913708210] [2020-08-18 19:38:03,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:03,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 19:38:03,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822435255] [2020-08-18 19:38:03,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 19:38:03,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:03,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 19:38:03,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 19:38:03,429 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-18 19:38:04,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:04,561 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 19:38:04,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 19:38:04,561 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-18 19:38:04,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:04,562 INFO L225 Difference]: With dead ends: 58 [2020-08-18 19:38:04,562 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 19:38:04,563 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 19:38:04,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 19:38:04,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-18 19:38:04,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 19:38:04,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 19:38:04,567 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-18 19:38:04,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:04,567 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 19:38:04,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 19:38:04,568 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 19:38:04,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 19:38:04,568 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:04,568 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:04,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 19:38:04,569 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:04,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:04,569 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-18 19:38:04,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:04,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [447101292] [2020-08-18 19:38:04,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:04,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:05,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:05,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:05,931 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:05,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [447101292] [2020-08-18 19:38:05,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:05,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 19:38:05,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732398766] [2020-08-18 19:38:05,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 19:38:05,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:05,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 19:38:05,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 19:38:05,934 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-18 19:38:07,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:07,109 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-18 19:38:07,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 19:38:07,111 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-18 19:38:07,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:07,112 INFO L225 Difference]: With dead ends: 59 [2020-08-18 19:38:07,112 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 19:38:07,113 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 19:38:07,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 19:38:07,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 19:38:07,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 19:38:07,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-18 19:38:07,119 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-18 19:38:07,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:07,121 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-18 19:38:07,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 19:38:07,121 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-18 19:38:07,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 19:38:07,122 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:07,122 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:07,122 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 19:38:07,122 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:07,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:07,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-18 19:38:07,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:07,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419788892] [2020-08-18 19:38:07,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:07,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:08,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:08,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:08,737 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:08,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419788892] [2020-08-18 19:38:08,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:08,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 19:38:08,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388496929] [2020-08-18 19:38:08,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 19:38:08,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:08,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 19:38:08,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 19:38:08,739 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-18 19:38:10,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:10,019 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 19:38:10,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 19:38:10,020 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-18 19:38:10,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:10,021 INFO L225 Difference]: With dead ends: 60 [2020-08-18 19:38:10,021 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 19:38:10,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 19:38:10,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 19:38:10,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 19:38:10,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 19:38:10,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 19:38:10,026 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-18 19:38:10,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:10,027 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 19:38:10,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 19:38:10,027 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 19:38:10,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 19:38:10,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:10,028 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:10,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 19:38:10,028 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:10,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:10,028 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-18 19:38:10,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:10,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1115022366] [2020-08-18 19:38:10,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:10,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:11,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:11,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:11,811 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:11,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1115022366] [2020-08-18 19:38:11,812 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:11,812 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 19:38:11,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137114661] [2020-08-18 19:38:11,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 19:38:11,813 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:11,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 19:38:11,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 19:38:11,815 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-18 19:38:13,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:13,145 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-18 19:38:13,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 19:38:13,146 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-18 19:38:13,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:13,147 INFO L225 Difference]: With dead ends: 61 [2020-08-18 19:38:13,147 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 19:38:13,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 19:38:13,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 19:38:13,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-18 19:38:13,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 19:38:13,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-18 19:38:13,151 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-18 19:38:13,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:13,152 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-18 19:38:13,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 19:38:13,152 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-18 19:38:13,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 19:38:13,152 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:13,152 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:13,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 19:38:13,153 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:13,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:13,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-18 19:38:13,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:13,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [15363936] [2020-08-18 19:38:13,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:13,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:14,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:14,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:14,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:14,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [15363936] [2020-08-18 19:38:14,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:14,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 19:38:14,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574350899] [2020-08-18 19:38:14,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 19:38:14,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:14,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 19:38:14,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 19:38:14,744 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-18 19:38:16,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:16,128 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 19:38:16,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 19:38:16,129 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-18 19:38:16,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:16,130 INFO L225 Difference]: With dead ends: 62 [2020-08-18 19:38:16,130 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 19:38:16,130 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 19:38:16,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 19:38:16,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 19:38:16,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 19:38:16,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 19:38:16,135 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-18 19:38:16,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:16,136 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 19:38:16,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 19:38:16,136 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 19:38:16,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 19:38:16,136 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:16,136 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:16,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 19:38:16,137 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:16,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:16,137 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-18 19:38:16,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:16,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [295712976] [2020-08-18 19:38:16,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:16,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:17,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:17,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:17,795 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:17,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [295712976] [2020-08-18 19:38:17,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:17,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 19:38:17,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718729841] [2020-08-18 19:38:17,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 19:38:17,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:17,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 19:38:17,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 19:38:17,797 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-18 19:38:19,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:19,270 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-18 19:38:19,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 19:38:19,271 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-18 19:38:19,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:19,272 INFO L225 Difference]: With dead ends: 63 [2020-08-18 19:38:19,272 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 19:38:19,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 19:38:19,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 19:38:19,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 19:38:19,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 19:38:19,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-18 19:38:19,277 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-18 19:38:19,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:19,277 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-18 19:38:19,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 19:38:19,277 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-18 19:38:19,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 19:38:19,278 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:19,278 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:19,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 19:38:19,278 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:19,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:19,278 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-18 19:38:19,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:19,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [228238160] [2020-08-18 19:38:19,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:19,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:21,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:21,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:21,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:21,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [228238160] [2020-08-18 19:38:21,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:21,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 19:38:21,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105264540] [2020-08-18 19:38:21,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 19:38:21,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:21,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 19:38:21,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 19:38:21,028 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-18 19:38:22,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:22,571 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-18 19:38:22,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-18 19:38:22,573 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-18 19:38:22,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:22,573 INFO L225 Difference]: With dead ends: 64 [2020-08-18 19:38:22,573 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 19:38:22,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 19:38:22,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 19:38:22,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-18 19:38:22,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 19:38:22,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-18 19:38:22,579 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-18 19:38:22,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:22,579 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-18 19:38:22,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-18 19:38:22,579 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-18 19:38:22,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 19:38:22,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:22,580 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:22,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-18 19:38:22,580 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:22,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:22,581 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-18 19:38:22,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:22,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109493000] [2020-08-18 19:38:22,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:22,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat