/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=BIGGEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 18:00:52,297 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 18:00:52,300 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 18:00:52,345 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 18:00:52,346 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 18:00:52,359 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 18:00:52,360 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 18:00:52,364 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 18:00:52,366 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 18:00:52,370 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 18:00:52,371 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 18:00:52,373 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 18:00:52,373 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 18:00:52,377 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 18:00:52,380 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 18:00:52,382 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 18:00:52,383 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 18:00:52,385 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 18:00:52,387 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 18:00:52,393 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 18:00:52,394 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 18:00:52,397 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 18:00:52,398 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 18:00:52,398 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 18:00:52,403 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 18:00:52,412 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 18:00:52,413 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 18:00:52,415 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 18:00:52,416 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 18:00:52,459 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 18:00:52,459 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 18:00:52,462 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 18:00:52,462 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 18:00:52,462 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 18:00:52,463 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 18:00:52,463 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 18:00:52,463 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 18:00:52,464 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 18:00:52,464 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 18:00:52,465 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 18:00:52,465 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 18:00:52,466 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 18:00:52,466 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 18:00:52,466 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 18:00:52,467 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 18:00:52,467 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 18:00:52,467 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 18:00:52,467 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 18:00:52,468 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 18:00:52,468 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 18:00:52,468 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 18:00:52,468 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 18:00:52,468 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 18:00:52,469 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 18:00:52,469 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 18:00:52,469 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 18:00:52,469 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 18:00:52,469 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 18:00:52,470 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=BIGGEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=BIGGEST; [2020-08-18 18:00:52,793 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 18:00:52,806 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 18:00:52,810 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 18:00:52,811 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 18:00:52,812 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 18:00:52,812 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 18:00:52,880 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d3e23c051/36dcd0cb8f7148719b532a5144f03581/FLAGc0f1cba74 [2020-08-18 18:00:53,321 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 18:00:53,324 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 18:00:53,331 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d3e23c051/36dcd0cb8f7148719b532a5144f03581/FLAGc0f1cba74 [2020-08-18 18:00:53,695 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d3e23c051/36dcd0cb8f7148719b532a5144f03581 [2020-08-18 18:00:53,705 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 18:00:53,707 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 18:00:53,708 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 18:00:53,708 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 18:00:53,714 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 18:00:53,715 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:00:53" (1/1) ... [2020-08-18 18:00:53,719 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@532b1c07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:53, skipping insertion in model container [2020-08-18 18:00:53,719 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:00:53" (1/1) ... [2020-08-18 18:00:53,728 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 18:00:53,745 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 18:00:53,916 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:00:53,922 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 18:00:53,937 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:00:53,949 INFO L208 MainTranslator]: Completed translation [2020-08-18 18:00:53,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:53 WrapperNode [2020-08-18 18:00:53,950 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 18:00:53,950 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 18:00:53,950 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 18:00:53,950 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 18:00:53,960 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:53" (1/1) ... [2020-08-18 18:00:53,960 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:53" (1/1) ... [2020-08-18 18:00:54,047 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:53" (1/1) ... [2020-08-18 18:00:54,052 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:53" (1/1) ... [2020-08-18 18:00:54,056 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:53" (1/1) ... [2020-08-18 18:00:54,061 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:53" (1/1) ... [2020-08-18 18:00:54,062 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:53" (1/1) ... [2020-08-18 18:00:54,063 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 18:00:54,064 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 18:00:54,064 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 18:00:54,064 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 18:00:54,065 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:53" (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 18:00:54,119 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 18:00:54,119 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 18:00:54,119 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 18:00:54,120 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 18:00:54,120 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 18:00:54,120 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 18:00:54,120 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 18:00:54,120 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 18:00:54,120 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 18:00:54,275 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 18:00:54,276 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 18:00:54,279 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:00:54 BoogieIcfgContainer [2020-08-18 18:00:54,280 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 18:00:54,281 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 18:00:54,281 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 18:00:54,284 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 18:00:54,284 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 06:00:53" (1/3) ... [2020-08-18 18:00:54,285 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@571e34f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:00:54, skipping insertion in model container [2020-08-18 18:00:54,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:00:53" (2/3) ... [2020-08-18 18:00:54,286 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@571e34f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:00:54, skipping insertion in model container [2020-08-18 18:00:54,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:00:54" (3/3) ... [2020-08-18 18:00:54,288 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-18 18:00:54,298 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 18:00:54,306 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 18:00:54,320 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 18:00:54,341 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 18:00:54,341 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 18:00:54,341 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 18:00:54,342 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 18:00:54,342 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 18:00:54,342 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 18:00:54,342 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 18:00:54,342 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 18:00:54,361 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 18:00:54,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 18:00:54,367 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:54,368 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:54,369 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:54,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:54,375 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 18:00:54,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:54,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [578967025] [2020-08-18 18:00:54,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:54,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:54,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:54,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:54,606 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 18:00:54,607 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [578967025] [2020-08-18 18:00:54,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:00:54,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 18:00:54,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055310435] [2020-08-18 18:00:54,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 18:00:54,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:54,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 18:00:54,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 18:00:54,635 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 18:00:54,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:54,683 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 18:00:54,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 18:00:54,685 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 18:00:54,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:54,693 INFO L225 Difference]: With dead ends: 29 [2020-08-18 18:00:54,694 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 18:00:54,698 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 18:00:54,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 18:00:54,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 18:00:54,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 18:00:54,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 18:00:54,746 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 18:00:54,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:54,746 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 18:00:54,747 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 18:00:54,747 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 18:00:54,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 18:00:54,748 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:54,748 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:54,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 18:00:54,749 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:54,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:54,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 18:00:54,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:54,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2102144052] [2020-08-18 18:00:54,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:54,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:54,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:54,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:54,833 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 18:00:54,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2102144052] [2020-08-18 18:00:54,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:54,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 18:00:54,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482550808] [2020-08-18 18:00:54,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 18:00:54,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:54,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 18:00:54,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:00:54,838 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 18:00:54,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:54,857 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 18:00:54,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 18:00:54,858 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 18:00:54,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:54,859 INFO L225 Difference]: With dead ends: 18 [2020-08-18 18:00:54,859 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 18:00:54,861 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 18:00:54,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 18:00:54,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 18:00:54,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 18:00:54,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 18:00:54,866 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 18:00:54,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:54,867 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 18:00:54,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 18:00:54,867 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 18:00:54,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 18:00:54,868 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:54,868 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:54,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 18:00:54,869 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:54,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:54,869 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 18:00:54,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:54,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [956754503] [2020-08-18 18:00:54,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:54,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:54,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:54,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:55,002 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 18:00:55,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [956754503] [2020-08-18 18:00:55,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:55,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 18:00:55,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912864103] [2020-08-18 18:00:55,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 18:00:55,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:55,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 18:00:55,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:00:55,006 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 18:00:55,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:55,042 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 18:00:55,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:00:55,043 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 18:00:55,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:55,044 INFO L225 Difference]: With dead ends: 19 [2020-08-18 18:00:55,044 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 18:00:55,045 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 18:00:55,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 18:00:55,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 18:00:55,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 18:00:55,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 18:00:55,050 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 18:00:55,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:55,051 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 18:00:55,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 18:00:55,051 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 18:00:55,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 18:00:55,052 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:55,052 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:55,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 18:00:55,053 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:55,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:55,053 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 18:00:55,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:55,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270413299] [2020-08-18 18:00:55,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:55,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:55,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:55,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:55,161 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 18:00:55,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270413299] [2020-08-18 18:00:55,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:55,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 18:00:55,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228177973] [2020-08-18 18:00:55,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 18:00:55,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:55,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 18:00:55,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:00:55,164 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 18:00:55,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:55,195 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 18:00:55,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 18:00:55,196 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 18:00:55,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:55,197 INFO L225 Difference]: With dead ends: 20 [2020-08-18 18:00:55,197 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 18:00:55,198 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 18:00:55,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 18:00:55,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 18:00:55,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 18:00:55,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 18:00:55,203 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 18:00:55,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:55,204 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 18:00:55,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 18:00:55,204 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 18:00:55,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 18:00:55,205 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:55,205 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:55,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 18:00:55,205 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:55,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:55,206 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 18:00:55,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:55,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1963771613] [2020-08-18 18:00:55,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:55,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:55,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:55,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:55,315 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 18:00:55,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1963771613] [2020-08-18 18:00:55,316 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:55,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 18:00:55,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352541664] [2020-08-18 18:00:55,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 18:00:55,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:55,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 18:00:55,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 18:00:55,318 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 18:00:55,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:55,356 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 18:00:55,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 18:00:55,357 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 18:00:55,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:55,358 INFO L225 Difference]: With dead ends: 21 [2020-08-18 18:00:55,358 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 18:00:55,359 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 18:00:55,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 18:00:55,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 18:00:55,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 18:00:55,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 18:00:55,366 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 18:00:55,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:55,366 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 18:00:55,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 18:00:55,366 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 18:00:55,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 18:00:55,367 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:55,367 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:55,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 18:00:55,368 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:55,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:55,369 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 18:00:55,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:55,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [323987320] [2020-08-18 18:00:55,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:55,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:55,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:55,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:55,564 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 18:00:55,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [323987320] [2020-08-18 18:00:55,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:55,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 18:00:55,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114998153] [2020-08-18 18:00:55,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 18:00:55,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:55,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 18:00:55,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:00:55,567 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 18:00:55,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:55,609 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 18:00:55,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 18:00:55,610 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 18:00:55,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:55,611 INFO L225 Difference]: With dead ends: 22 [2020-08-18 18:00:55,611 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 18:00:55,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:00:55,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 18:00:55,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 18:00:55,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 18:00:55,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 18:00:55,617 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 18:00:55,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:55,618 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 18:00:55,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 18:00:55,618 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 18:00:55,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 18:00:55,619 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:55,619 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:55,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 18:00:55,619 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:55,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:55,620 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 18:00:55,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:55,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1643742960] [2020-08-18 18:00:55,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:55,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:55,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:55,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:55,746 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 18:00:55,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1643742960] [2020-08-18 18:00:55,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:55,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 18:00:55,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161316821] [2020-08-18 18:00:55,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 18:00:55,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:55,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 18:00:55,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 18:00:55,749 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-18 18:00:55,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:55,800 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 18:00:55,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 18:00:55,801 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-18 18:00:55,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:55,802 INFO L225 Difference]: With dead ends: 23 [2020-08-18 18:00:55,802 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 18:00:55,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 18:00:55,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 18:00:55,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 18:00:55,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 18:00:55,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-18 18:00:55,808 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-18 18:00:55,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:55,809 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-18 18:00:55,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 18:00:55,809 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-18 18:00:55,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 18:00:55,810 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:55,810 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:55,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 18:00:55,810 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:55,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:55,811 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-18 18:00:55,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:55,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [153184971] [2020-08-18 18:00:55,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:55,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:55,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:55,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:55,951 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 18:00:55,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [153184971] [2020-08-18 18:00:55,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:55,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 18:00:55,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293428812] [2020-08-18 18:00:55,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 18:00:55,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:55,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 18:00:55,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:00:55,954 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-18 18:00:56,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:56,026 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 18:00:56,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 18:00:56,027 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-18 18:00:56,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:56,028 INFO L225 Difference]: With dead ends: 24 [2020-08-18 18:00:56,028 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 18:00:56,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:00:56,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 18:00:56,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 18:00:56,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 18:00:56,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 18:00:56,036 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-18 18:00:56,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:56,037 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 18:00:56,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 18:00:56,037 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 18:00:56,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 18:00:56,038 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:56,039 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:56,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 18:00:56,039 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:56,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:56,039 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-18 18:00:56,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:56,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [804393063] [2020-08-18 18:00:56,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:56,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:56,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:56,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:56,244 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 18:00:56,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [804393063] [2020-08-18 18:00:56,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:56,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 18:00:56,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364279949] [2020-08-18 18:00:56,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 18:00:56,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:56,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 18:00:56,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 18:00:56,250 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-18 18:00:56,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:56,331 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 18:00:56,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 18:00:56,333 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-18 18:00:56,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:56,334 INFO L225 Difference]: With dead ends: 25 [2020-08-18 18:00:56,334 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 18:00:56,336 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 18:00:56,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 18:00:56,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 18:00:56,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 18:00:56,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 18:00:56,348 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-18 18:00:56,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:56,349 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 18:00:56,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 18:00:56,349 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 18:00:56,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 18:00:56,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:56,350 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:56,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 18:00:56,353 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:56,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:56,354 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-18 18:00:56,354 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:56,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611489672] [2020-08-18 18:00:56,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:56,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:56,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:56,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:56,536 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 18:00:56,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611489672] [2020-08-18 18:00:56,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:56,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 18:00:56,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946587535] [2020-08-18 18:00:56,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 18:00:56,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:56,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 18:00:56,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 18:00:56,539 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-18 18:00:56,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:56,622 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 18:00:56,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 18:00:56,623 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-18 18:00:56,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:56,624 INFO L225 Difference]: With dead ends: 26 [2020-08-18 18:00:56,624 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 18:00:56,625 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 18:00:56,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 18:00:56,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 18:00:56,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 18:00:56,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 18:00:56,630 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-18 18:00:56,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:56,631 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 18:00:56,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 18:00:56,631 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 18:00:56,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 18:00:56,632 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:56,632 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:56,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 18:00:56,632 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:56,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:56,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-18 18:00:56,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:56,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872356147] [2020-08-18 18:00:56,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:56,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:56,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:56,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:56,834 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 18:00:56,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872356147] [2020-08-18 18:00:56,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:56,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 18:00:56,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673842383] [2020-08-18 18:00:56,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 18:00:56,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:56,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 18:00:56,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 18:00:56,836 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-18 18:00:56,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:56,928 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 18:00:56,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 18:00:56,929 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-18 18:00:56,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:56,929 INFO L225 Difference]: With dead ends: 27 [2020-08-18 18:00:56,930 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 18:00:56,930 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 18:00:56,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 18:00:56,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 18:00:56,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 18:00:56,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 18:00:56,935 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-18 18:00:56,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:56,935 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 18:00:56,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 18:00:56,936 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 18:00:56,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 18:00:56,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:56,937 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:56,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 18:00:56,937 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:56,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:56,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-18 18:00:56,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:56,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [811297121] [2020-08-18 18:00:56,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:56,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:57,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:57,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:57,122 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 18:00:57,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [811297121] [2020-08-18 18:00:57,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:57,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 18:00:57,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551282738] [2020-08-18 18:00:57,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 18:00:57,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:57,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 18:00:57,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 18:00:57,124 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-18 18:00:57,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:57,234 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 18:00:57,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 18:00:57,234 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-18 18:00:57,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:57,235 INFO L225 Difference]: With dead ends: 28 [2020-08-18 18:00:57,235 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 18:00:57,236 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 18:00:57,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 18:00:57,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 18:00:57,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 18:00:57,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 18:00:57,241 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-18 18:00:57,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:57,241 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 18:00:57,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 18:00:57,242 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 18:00:57,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 18:00:57,242 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:57,243 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:57,243 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 18:00:57,243 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:57,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:57,243 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-18 18:00:57,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:57,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1268861720] [2020-08-18 18:00:57,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:57,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:57,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:57,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:57,454 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 18:00:57,454 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1268861720] [2020-08-18 18:00:57,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:57,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 18:00:57,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114777945] [2020-08-18 18:00:57,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 18:00:57,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:57,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 18:00:57,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 18:00:57,456 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-18 18:00:57,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:57,584 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 18:00:57,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 18:00:57,585 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-18 18:00:57,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:57,585 INFO L225 Difference]: With dead ends: 29 [2020-08-18 18:00:57,586 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 18:00:57,586 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 18:00:57,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 18:00:57,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 18:00:57,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 18:00:57,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-18 18:00:57,590 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-18 18:00:57,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:57,591 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-18 18:00:57,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 18:00:57,591 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-18 18:00:57,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 18:00:57,592 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:57,592 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:57,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 18:00:57,592 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:57,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:57,593 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-18 18:00:57,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:57,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052118345] [2020-08-18 18:00:57,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:57,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:57,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:57,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:57,806 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 18:00:57,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052118345] [2020-08-18 18:00:57,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:57,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 18:00:57,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925752071] [2020-08-18 18:00:57,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 18:00:57,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:57,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 18:00:57,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:00:57,808 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-18 18:00:57,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:57,938 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 18:00:57,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 18:00:57,939 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-18 18:00:57,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:57,940 INFO L225 Difference]: With dead ends: 30 [2020-08-18 18:00:57,940 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 18:00:57,940 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 18:00:57,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 18:00:57,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 18:00:57,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 18:00:57,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 18:00:57,945 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-18 18:00:57,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:57,945 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 18:00:57,946 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 18:00:57,946 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 18:00:57,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 18:00:57,946 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:57,947 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:57,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 18:00:57,947 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:57,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:57,947 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-18 18:00:57,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:57,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [13631322] [2020-08-18 18:00:57,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:57,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:58,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:58,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:58,189 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 18:00:58,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [13631322] [2020-08-18 18:00:58,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:58,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 18:00:58,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166532266] [2020-08-18 18:00:58,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 18:00:58,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:58,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 18:00:58,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 18:00:58,193 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-18 18:00:58,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:58,383 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 18:00:58,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 18:00:58,384 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-18 18:00:58,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:58,384 INFO L225 Difference]: With dead ends: 31 [2020-08-18 18:00:58,384 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 18:00:58,385 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 18:00:58,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 18:00:58,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 18:00:58,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 18:00:58,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 18:00:58,390 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-18 18:00:58,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:58,390 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 18:00:58,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 18:00:58,391 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 18:00:58,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 18:00:58,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:58,391 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:58,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 18:00:58,392 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:58,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:58,392 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-18 18:00:58,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:58,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [928656270] [2020-08-18 18:00:58,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:58,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:58,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:58,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:58,635 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 18:00:58,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [928656270] [2020-08-18 18:00:58,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:58,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 18:00:58,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243988530] [2020-08-18 18:00:58,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 18:00:58,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:58,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 18:00:58,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:00:58,638 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-18 18:00:58,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:58,799 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 18:00:58,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 18:00:58,800 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-18 18:00:58,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:58,801 INFO L225 Difference]: With dead ends: 32 [2020-08-18 18:00:58,801 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 18:00:58,801 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 18:00:58,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 18:00:58,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 18:00:58,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 18:00:58,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 18:00:58,806 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-18 18:00:58,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:58,806 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 18:00:58,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 18:00:58,806 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 18:00:58,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 18:00:58,807 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:58,807 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:58,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 18:00:58,808 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:58,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:58,808 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-18 18:00:58,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:58,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198188098] [2020-08-18 18:00:58,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:58,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:59,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:59,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:59,090 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 18:00:59,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198188098] [2020-08-18 18:00:59,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:59,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 18:00:59,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422164806] [2020-08-18 18:00:59,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 18:00:59,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:59,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 18:00:59,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:00:59,093 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-18 18:00:59,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:59,319 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-18 18:00:59,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 18:00:59,320 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-18 18:00:59,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:59,321 INFO L225 Difference]: With dead ends: 33 [2020-08-18 18:00:59,322 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 18:00:59,322 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 18:00:59,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 18:00:59,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 18:00:59,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 18:00:59,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-18 18:00:59,329 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-18 18:00:59,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:59,329 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-18 18:00:59,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 18:00:59,329 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-18 18:00:59,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 18:00:59,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:59,330 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:59,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 18:00:59,331 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:59,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:59,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-18 18:00:59,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:59,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1371670823] [2020-08-18 18:00:59,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:59,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:59,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:00:59,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:00:59,704 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 18:00:59,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1371670823] [2020-08-18 18:00:59,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:00:59,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 18:00:59,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864906809] [2020-08-18 18:00:59,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 18:00:59,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:00:59,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 18:00:59,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:00:59,707 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-18 18:00:59,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:00:59,948 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 18:00:59,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 18:00:59,950 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-18 18:00:59,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:00:59,950 INFO L225 Difference]: With dead ends: 34 [2020-08-18 18:00:59,950 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 18:00:59,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:00:59,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 18:00:59,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 18:00:59,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 18:00:59,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 18:00:59,956 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-18 18:00:59,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:00:59,956 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 18:00:59,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 18:00:59,956 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 18:00:59,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 18:00:59,957 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:00:59,957 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:00:59,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 18:00:59,958 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:00:59,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:00:59,958 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-18 18:00:59,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:00:59,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889591063] [2020-08-18 18:00:59,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:00:59,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:00,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:00,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:00,304 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 18:01:00,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889591063] [2020-08-18 18:01:00,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:00,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 18:01:00,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729488175] [2020-08-18 18:01:00,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 18:01:00,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:00,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 18:01:00,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:01:00,306 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-18 18:01:00,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:00,556 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 18:01:00,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 18:01:00,557 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-18 18:01:00,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:00,557 INFO L225 Difference]: With dead ends: 35 [2020-08-18 18:01:00,557 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 18:01:00,558 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 18:01:00,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 18:01:00,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 18:01:00,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 18:01:00,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-18 18:01:00,562 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-18 18:01:00,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:00,563 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-18 18:01:00,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 18:01:00,563 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-18 18:01:00,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 18:01:00,564 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:00,564 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:00,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 18:01:00,564 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:00,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:00,565 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-18 18:01:00,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:00,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1413309747] [2020-08-18 18:01:00,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:00,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:00,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:00,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:00,950 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 18:01:00,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1413309747] [2020-08-18 18:01:00,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:00,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 18:01:00,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024098525] [2020-08-18 18:01:00,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 18:01:00,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:00,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 18:01:00,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 18:01:00,952 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-18 18:01:01,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:01,209 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 18:01:01,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 18:01:01,212 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-18 18:01:01,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:01,212 INFO L225 Difference]: With dead ends: 36 [2020-08-18 18:01:01,212 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 18:01:01,213 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 18:01:01,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 18:01:01,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 18:01:01,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 18:01:01,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 18:01:01,217 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-18 18:01:01,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:01,218 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 18:01:01,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 18:01:01,218 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 18:01:01,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 18:01:01,218 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:01,219 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:01,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 18:01:01,219 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:01,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:01,219 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-18 18:01:01,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:01,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [923415347] [2020-08-18 18:01:01,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:01,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:01,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:01,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:01,668 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 18:01:01,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [923415347] [2020-08-18 18:01:01,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:01,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 18:01:01,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11881156] [2020-08-18 18:01:01,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 18:01:01,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:01,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 18:01:01,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:01:01,671 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-18 18:01:01,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:01,990 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-18 18:01:01,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 18:01:01,991 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-18 18:01:01,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:01,992 INFO L225 Difference]: With dead ends: 37 [2020-08-18 18:01:01,992 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 18:01:01,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:01:01,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 18:01:01,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 18:01:01,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 18:01:01,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 18:01:01,997 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-18 18:01:01,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:01,998 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 18:01:01,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 18:01:01,998 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 18:01:01,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 18:01:01,999 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:01,999 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:01,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 18:01:01,999 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:01,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:01,999 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-18 18:01:02,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:02,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703253958] [2020-08-18 18:01:02,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:02,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:02,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:02,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:02,403 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 18:01:02,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1703253958] [2020-08-18 18:01:02,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:02,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 18:01:02,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777302437] [2020-08-18 18:01:02,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 18:01:02,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:02,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 18:01:02,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:01:02,405 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-18 18:01:02,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:02,726 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 18:01:02,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 18:01:02,728 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-18 18:01:02,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:02,728 INFO L225 Difference]: With dead ends: 38 [2020-08-18 18:01:02,728 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 18:01:02,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:01:02,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 18:01:02,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 18:01:02,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 18:01:02,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 18:01:02,734 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-18 18:01:02,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:02,734 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 18:01:02,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 18:01:02,734 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 18:01:02,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 18:01:02,735 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:02,735 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:02,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 18:01:02,736 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:02,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:02,736 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-18 18:01:02,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:02,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1551882936] [2020-08-18 18:01:02,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:02,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:03,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:03,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:03,170 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 18:01:03,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1551882936] [2020-08-18 18:01:03,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:03,173 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 18:01:03,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927368219] [2020-08-18 18:01:03,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 18:01:03,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:03,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 18:01:03,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:01:03,177 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-18 18:01:03,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:03,481 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-18 18:01:03,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 18:01:03,481 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-18 18:01:03,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:03,482 INFO L225 Difference]: With dead ends: 39 [2020-08-18 18:01:03,482 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 18:01:03,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:01:03,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 18:01:03,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 18:01:03,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 18:01:03,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-18 18:01:03,493 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-18 18:01:03,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:03,494 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-18 18:01:03,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 18:01:03,494 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-18 18:01:03,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 18:01:03,495 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:03,495 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:03,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 18:01:03,495 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:03,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:03,500 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-18 18:01:03,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:03,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [833744489] [2020-08-18 18:01:03,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:03,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:04,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:04,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:04,032 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 18:01:04,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [833744489] [2020-08-18 18:01:04,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:04,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 18:01:04,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146957049] [2020-08-18 18:01:04,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 18:01:04,033 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:04,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 18:01:04,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 18:01:04,034 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-18 18:01:04,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:04,380 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 18:01:04,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 18:01:04,380 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-18 18:01:04,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:04,381 INFO L225 Difference]: With dead ends: 40 [2020-08-18 18:01:04,381 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 18:01:04,382 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 18:01:04,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 18:01:04,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 18:01:04,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 18:01:04,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 18:01:04,387 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-18 18:01:04,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:04,388 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 18:01:04,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 18:01:04,388 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 18:01:04,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 18:01:04,389 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:04,389 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:04,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 18:01:04,389 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:04,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:04,390 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-18 18:01:04,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:04,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352788366] [2020-08-18 18:01:04,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:04,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:04,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:04,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:04,933 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 18:01:04,933 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352788366] [2020-08-18 18:01:04,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:04,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 18:01:04,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128726441] [2020-08-18 18:01:04,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 18:01:04,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:04,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 18:01:04,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 18:01:04,935 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-18 18:01:05,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:05,316 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 18:01:05,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 18:01:05,322 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-18 18:01:05,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:05,322 INFO L225 Difference]: With dead ends: 41 [2020-08-18 18:01:05,323 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 18:01:05,323 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 18:01:05,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 18:01:05,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 18:01:05,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 18:01:05,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-18 18:01:05,327 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-18 18:01:05,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:05,328 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-18 18:01:05,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 18:01:05,328 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-18 18:01:05,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 18:01:05,328 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:05,329 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:05,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 18:01:05,329 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:05,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:05,329 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-18 18:01:05,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:05,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472665258] [2020-08-18 18:01:05,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:05,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:05,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:05,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:05,887 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 18:01:05,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472665258] [2020-08-18 18:01:05,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:05,887 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 18:01:05,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026850231] [2020-08-18 18:01:05,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 18:01:05,888 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:05,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 18:01:05,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 18:01:05,889 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-18 18:01:06,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:06,296 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 18:01:06,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 18:01:06,297 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-18 18:01:06,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:06,297 INFO L225 Difference]: With dead ends: 42 [2020-08-18 18:01:06,298 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 18:01:06,298 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 18:01:06,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 18:01:06,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 18:01:06,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 18:01:06,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 18:01:06,303 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-18 18:01:06,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:06,304 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 18:01:06,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 18:01:06,304 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 18:01:06,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 18:01:06,304 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:06,305 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:06,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 18:01:06,305 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:06,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:06,305 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-18 18:01:06,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:06,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673575869] [2020-08-18 18:01:06,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:06,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:06,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:06,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:06,932 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 18:01:06,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673575869] [2020-08-18 18:01:06,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:06,933 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 18:01:06,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659693236] [2020-08-18 18:01:06,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 18:01:06,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:06,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 18:01:06,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 18:01:06,934 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-18 18:01:07,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:07,376 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-18 18:01:07,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 18:01:07,376 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-18 18:01:07,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:07,377 INFO L225 Difference]: With dead ends: 43 [2020-08-18 18:01:07,377 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 18:01:07,378 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 18:01:07,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 18:01:07,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 18:01:07,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 18:01:07,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 18:01:07,389 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-18 18:01:07,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:07,392 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 18:01:07,392 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 18:01:07,392 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 18:01:07,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 18:01:07,393 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:07,393 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:07,393 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 18:01:07,393 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:07,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:07,393 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-18 18:01:07,394 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:07,394 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [381667074] [2020-08-18 18:01:07,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:07,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:08,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:08,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:08,237 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 18:01:08,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [381667074] [2020-08-18 18:01:08,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:08,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 18:01:08,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905679882] [2020-08-18 18:01:08,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 18:01:08,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:08,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 18:01:08,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 18:01:08,241 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-18 18:01:08,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:08,751 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 18:01:08,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 18:01:08,752 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-18 18:01:08,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:08,753 INFO L225 Difference]: With dead ends: 44 [2020-08-18 18:01:08,753 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 18:01:08,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 18:01:08,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 18:01:08,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 18:01:08,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 18:01:08,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 18:01:08,760 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-18 18:01:08,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:08,760 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 18:01:08,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 18:01:08,761 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 18:01:08,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 18:01:08,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:08,761 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:08,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 18:01:08,762 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:08,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:08,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-18 18:01:08,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:08,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130924179] [2020-08-18 18:01:08,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:08,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:09,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:09,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:09,602 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 18:01:09,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130924179] [2020-08-18 18:01:09,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:09,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 18:01:09,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971410448] [2020-08-18 18:01:09,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 18:01:09,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:09,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 18:01:09,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:01:09,604 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-18 18:01:10,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:10,114 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-18 18:01:10,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 18:01:10,115 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-18 18:01:10,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:10,116 INFO L225 Difference]: With dead ends: 45 [2020-08-18 18:01:10,116 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 18:01:10,117 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 18:01:10,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 18:01:10,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 18:01:10,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 18:01:10,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-18 18:01:10,122 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-18 18:01:10,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:10,123 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-18 18:01:10,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 18:01:10,123 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-18 18:01:10,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 18:01:10,123 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:10,123 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:10,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 18:01:10,124 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:10,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:10,124 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-18 18:01:10,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:10,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424582108] [2020-08-18 18:01:10,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:10,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:10,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:10,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:10,795 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 18:01:10,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424582108] [2020-08-18 18:01:10,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:10,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 18:01:10,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578346109] [2020-08-18 18:01:10,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 18:01:10,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:10,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 18:01:10,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:01:10,797 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-18 18:01:11,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:11,342 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 18:01:11,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 18:01:11,342 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-18 18:01:11,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:11,343 INFO L225 Difference]: With dead ends: 46 [2020-08-18 18:01:11,343 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 18:01:11,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:01:11,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 18:01:11,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 18:01:11,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 18:01:11,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 18:01:11,348 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-18 18:01:11,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:11,349 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 18:01:11,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 18:01:11,349 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 18:01:11,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 18:01:11,349 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:11,350 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:11,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 18:01:11,350 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:11,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:11,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-18 18:01:11,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:11,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [161692031] [2020-08-18 18:01:11,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:11,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:12,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:12,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:12,102 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 18:01:12,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [161692031] [2020-08-18 18:01:12,103 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:12,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 18:01:12,103 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716829468] [2020-08-18 18:01:12,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 18:01:12,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:12,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 18:01:12,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 18:01:12,104 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-18 18:01:12,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:12,728 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 18:01:12,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 18:01:12,731 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-18 18:01:12,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:12,732 INFO L225 Difference]: With dead ends: 47 [2020-08-18 18:01:12,732 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 18:01:12,732 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 18:01:12,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 18:01:12,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 18:01:12,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 18:01:12,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-18 18:01:12,736 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-18 18:01:12,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:12,737 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-18 18:01:12,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 18:01:12,737 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-18 18:01:12,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 18:01:12,737 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:12,737 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:12,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 18:01:12,738 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:12,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:12,738 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-18 18:01:12,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:12,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1628584463] [2020-08-18 18:01:12,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:12,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:13,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:13,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:13,535 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 18:01:13,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1628584463] [2020-08-18 18:01:13,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:13,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 18:01:13,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532416426] [2020-08-18 18:01:13,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 18:01:13,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:13,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 18:01:13,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 18:01:13,537 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-18 18:01:14,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:14,177 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 18:01:14,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 18:01:14,178 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-18 18:01:14,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:14,179 INFO L225 Difference]: With dead ends: 48 [2020-08-18 18:01:14,179 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 18:01:14,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 18:01:14,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 18:01:14,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 18:01:14,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 18:01:14,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 18:01:14,184 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-18 18:01:14,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:14,184 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 18:01:14,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 18:01:14,185 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 18:01:14,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 18:01:14,185 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:14,185 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:14,185 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 18:01:14,186 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:14,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:14,186 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-18 18:01:14,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:14,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [494967285] [2020-08-18 18:01:14,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:14,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:15,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:15,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:15,043 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 18:01:15,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [494967285] [2020-08-18 18:01:15,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:15,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 18:01:15,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540860399] [2020-08-18 18:01:15,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 18:01:15,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:15,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 18:01:15,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 18:01:15,045 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-18 18:01:15,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:15,722 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-18 18:01:15,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 18:01:15,723 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-18 18:01:15,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:15,724 INFO L225 Difference]: With dead ends: 49 [2020-08-18 18:01:15,724 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 18:01:15,725 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 18:01:15,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 18:01:15,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 18:01:15,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 18:01:15,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 18:01:15,729 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-18 18:01:15,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:15,730 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 18:01:15,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 18:01:15,730 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 18:01:15,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 18:01:15,731 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:15,731 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:15,731 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 18:01:15,731 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:15,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:15,731 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-18 18:01:15,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:15,732 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529355900] [2020-08-18 18:01:15,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:15,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:16,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:16,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:16,647 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 18:01:16,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529355900] [2020-08-18 18:01:16,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:16,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 18:01:16,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198721250] [2020-08-18 18:01:16,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 18:01:16,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:16,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 18:01:16,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 18:01:16,649 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-18 18:01:17,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:17,357 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 18:01:17,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 18:01:17,358 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-18 18:01:17,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:17,358 INFO L225 Difference]: With dead ends: 50 [2020-08-18 18:01:17,359 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 18:01:17,360 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 18:01:17,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 18:01:17,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 18:01:17,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 18:01:17,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 18:01:17,364 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-18 18:01:17,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:17,364 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 18:01:17,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 18:01:17,364 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 18:01:17,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 18:01:17,365 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:17,365 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:17,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 18:01:17,365 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:17,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:17,366 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-18 18:01:17,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:17,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307342825] [2020-08-18 18:01:17,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:17,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:18,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:18,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:18,336 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 18:01:18,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307342825] [2020-08-18 18:01:18,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:18,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 18:01:18,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478269088] [2020-08-18 18:01:18,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 18:01:18,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:18,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 18:01:18,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 18:01:18,338 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-18 18:01:19,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:19,091 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-18 18:01:19,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 18:01:19,092 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-18 18:01:19,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:19,093 INFO L225 Difference]: With dead ends: 51 [2020-08-18 18:01:19,093 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 18:01:19,094 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 18:01:19,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 18:01:19,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 18:01:19,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 18:01:19,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-18 18:01:19,099 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-18 18:01:19,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:19,099 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-18 18:01:19,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 18:01:19,100 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-18 18:01:19,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 18:01:19,100 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:19,100 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:19,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 18:01:19,101 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:19,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:19,101 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-18 18:01:19,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:19,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806291555] [2020-08-18 18:01:19,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:19,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:20,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:20,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:20,099 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 18:01:20,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806291555] [2020-08-18 18:01:20,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:20,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 18:01:20,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038418418] [2020-08-18 18:01:20,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 18:01:20,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:20,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 18:01:20,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 18:01:20,101 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-18 18:01:20,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:20,901 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 18:01:20,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 18:01:20,902 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-18 18:01:20,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:20,903 INFO L225 Difference]: With dead ends: 52 [2020-08-18 18:01:20,903 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 18:01:20,904 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 18:01:20,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 18:01:20,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 18:01:20,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 18:01:20,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 18:01:20,910 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-18 18:01:20,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:20,910 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 18:01:20,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 18:01:20,910 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 18:01:20,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 18:01:20,911 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:20,911 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:20,911 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 18:01:20,911 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:20,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:20,912 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-18 18:01:20,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:20,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667587872] [2020-08-18 18:01:20,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:20,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:21,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:21,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:21,966 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 18:01:21,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667587872] [2020-08-18 18:01:21,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:21,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 18:01:21,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96994720] [2020-08-18 18:01:21,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 18:01:21,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:21,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 18:01:21,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:01:21,968 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-18 18:01:22,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:22,889 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 18:01:22,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 18:01:22,890 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-18 18:01:22,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:22,891 INFO L225 Difference]: With dead ends: 53 [2020-08-18 18:01:22,891 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 18:01:22,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:01:22,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 18:01:22,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 18:01:22,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 18:01:22,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-18 18:01:22,895 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-18 18:01:22,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:22,896 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-18 18:01:22,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 18:01:22,896 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-18 18:01:22,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 18:01:22,896 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:22,897 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:22,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 18:01:22,897 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:22,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:22,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-18 18:01:22,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:22,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33701697] [2020-08-18 18:01:22,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:22,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:23,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:23,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:23,932 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 18:01:23,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33701697] [2020-08-18 18:01:23,933 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:23,933 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 18:01:23,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956484037] [2020-08-18 18:01:23,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 18:01:23,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:23,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 18:01:23,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:01:23,935 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-18 18:01:24,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:24,844 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 18:01:24,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 18:01:24,846 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-18 18:01:24,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:24,846 INFO L225 Difference]: With dead ends: 54 [2020-08-18 18:01:24,847 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 18:01:24,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:01:24,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 18:01:24,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 18:01:24,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 18:01:24,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 18:01:24,850 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-18 18:01:24,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:24,850 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 18:01:24,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 18:01:24,851 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 18:01:24,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 18:01:24,851 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:24,851 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:24,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 18:01:24,852 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:24,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:24,852 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-18 18:01:24,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:24,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103148451] [2020-08-18 18:01:24,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:24,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:26,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:26,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:26,041 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 18:01:26,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103148451] [2020-08-18 18:01:26,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:26,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 18:01:26,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814897177] [2020-08-18 18:01:26,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 18:01:26,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:26,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 18:01:26,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 18:01:26,043 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-18 18:01:27,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:27,016 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-18 18:01:27,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 18:01:27,017 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-18 18:01:27,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:27,018 INFO L225 Difference]: With dead ends: 55 [2020-08-18 18:01:27,018 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 18:01:27,019 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 18:01:27,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 18:01:27,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 18:01:27,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 18:01:27,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-18 18:01:27,023 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-18 18:01:27,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:27,023 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-18 18:01:27,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 18:01:27,023 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-18 18:01:27,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 18:01:27,024 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:27,024 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:27,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 18:01:27,024 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:27,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:27,024 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-18 18:01:27,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:27,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [631791700] [2020-08-18 18:01:27,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:27,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:28,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:28,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:28,511 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 18:01:28,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [631791700] [2020-08-18 18:01:28,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:28,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 18:01:28,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778629429] [2020-08-18 18:01:28,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 18:01:28,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:28,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 18:01:28,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 18:01:28,513 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-18 18:01:29,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:29,498 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 18:01:29,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 18:01:29,499 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-18 18:01:29,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:29,500 INFO L225 Difference]: With dead ends: 56 [2020-08-18 18:01:29,500 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 18:01:29,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 18:01:29,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 18:01:29,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 18:01:29,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 18:01:29,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 18:01:29,504 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-18 18:01:29,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:29,505 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 18:01:29,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 18:01:29,505 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 18:01:29,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 18:01:29,505 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:29,505 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:29,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 18:01:29,506 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:29,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:29,506 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-18 18:01:29,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:29,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1870351248] [2020-08-18 18:01:29,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:29,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:30,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:30,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:30,771 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 18:01:30,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1870351248] [2020-08-18 18:01:30,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:30,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 18:01:30,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072294924] [2020-08-18 18:01:30,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 18:01:30,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:30,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 18:01:30,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 18:01:30,774 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-18 18:01:31,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:31,838 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-18 18:01:31,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 18:01:31,839 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-18 18:01:31,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:31,840 INFO L225 Difference]: With dead ends: 57 [2020-08-18 18:01:31,840 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 18:01:31,842 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 18:01:31,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 18:01:31,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 18:01:31,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 18:01:31,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-18 18:01:31,845 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-18 18:01:31,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:31,846 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-18 18:01:31,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 18:01:31,846 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-18 18:01:31,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 18:01:31,846 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:31,846 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:31,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 18:01:31,847 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:31,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:31,847 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-18 18:01:31,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:31,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [782137722] [2020-08-18 18:01:31,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:31,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:33,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:33,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:33,207 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 18:01:33,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [782137722] [2020-08-18 18:01:33,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:33,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 18:01:33,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839125587] [2020-08-18 18:01:33,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 18:01:33,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:33,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 18:01:33,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 18:01:33,208 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-18 18:01:34,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:34,305 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 18:01:34,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 18:01:34,312 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-18 18:01:34,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:34,313 INFO L225 Difference]: With dead ends: 58 [2020-08-18 18:01:34,313 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 18:01:34,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 18:01:34,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 18:01:34,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-18 18:01:34,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 18:01:34,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 18:01:34,317 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-18 18:01:34,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:34,318 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 18:01:34,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 18:01:34,318 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 18:01:34,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 18:01:34,318 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:34,318 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:34,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 18:01:34,319 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:34,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:34,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-18 18:01:34,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:34,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [893133732] [2020-08-18 18:01:34,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:34,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:35,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:35,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:35,694 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 18:01:35,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [893133732] [2020-08-18 18:01:35,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:35,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 18:01:35,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839574119] [2020-08-18 18:01:35,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 18:01:35,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:35,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 18:01:35,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 18:01:35,697 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-18 18:01:36,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:36,856 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-18 18:01:36,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 18:01:36,858 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-18 18:01:36,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:36,859 INFO L225 Difference]: With dead ends: 59 [2020-08-18 18:01:36,859 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 18:01:36,860 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 18:01:36,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 18:01:36,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 18:01:36,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 18:01:36,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-18 18:01:36,864 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-18 18:01:36,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:36,864 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-18 18:01:36,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 18:01:36,865 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-18 18:01:36,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 18:01:36,865 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:36,865 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:36,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 18:01:36,865 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:36,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:36,866 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-18 18:01:36,866 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:36,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2062921526] [2020-08-18 18:01:36,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:36,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:38,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:38,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:38,275 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 18:01:38,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2062921526] [2020-08-18 18:01:38,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:38,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 18:01:38,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905503456] [2020-08-18 18:01:38,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 18:01:38,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:38,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 18:01:38,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 18:01:38,277 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-18 18:01:39,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:39,551 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 18:01:39,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 18:01:39,551 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-18 18:01:39,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:39,552 INFO L225 Difference]: With dead ends: 60 [2020-08-18 18:01:39,552 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 18:01:39,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 18:01:39,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 18:01:39,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 18:01:39,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 18:01:39,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 18:01:39,556 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-18 18:01:39,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:39,556 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 18:01:39,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 18:01:39,556 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 18:01:39,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 18:01:39,557 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:39,557 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:39,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 18:01:39,557 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:39,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:39,557 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-18 18:01:39,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:39,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1714493938] [2020-08-18 18:01:39,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:39,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:41,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:41,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:41,033 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 18:01:41,033 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1714493938] [2020-08-18 18:01:41,033 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:41,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 18:01:41,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062211631] [2020-08-18 18:01:41,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 18:01:41,034 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:41,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 18:01:41,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 18:01:41,034 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-18 18:01:42,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:42,369 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-18 18:01:42,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 18:01:42,369 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-18 18:01:42,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:42,370 INFO L225 Difference]: With dead ends: 61 [2020-08-18 18:01:42,370 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 18:01:42,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 18:01:42,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 18:01:42,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-18 18:01:42,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 18:01:42,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-18 18:01:42,375 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-18 18:01:42,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:42,376 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-18 18:01:42,376 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 18:01:42,376 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-18 18:01:42,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 18:01:42,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:42,377 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:42,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 18:01:42,377 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:42,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:42,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-18 18:01:42,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:42,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1046328747] [2020-08-18 18:01:42,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:42,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:43,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:43,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:43,910 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 18:01:43,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1046328747] [2020-08-18 18:01:43,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:43,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 18:01:43,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395184291] [2020-08-18 18:01:43,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 18:01:43,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:43,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 18:01:43,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 18:01:43,912 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-18 18:01:45,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:45,260 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 18:01:45,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 18:01:45,261 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-18 18:01:45,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:45,262 INFO L225 Difference]: With dead ends: 62 [2020-08-18 18:01:45,262 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 18:01:45,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 18:01:45,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 18:01:45,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 18:01:45,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 18:01:45,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 18:01:45,267 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-18 18:01:45,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:45,267 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 18:01:45,268 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 18:01:45,268 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 18:01:45,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 18:01:45,268 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:45,268 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:45,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 18:01:45,268 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:45,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:45,269 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-18 18:01:45,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:45,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99411393] [2020-08-18 18:01:45,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:45,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:46,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:46,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:46,858 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 18:01:46,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99411393] [2020-08-18 18:01:46,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:46,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 18:01:46,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276614749] [2020-08-18 18:01:46,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 18:01:46,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:46,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 18:01:46,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 18:01:46,860 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-18 18:01:48,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:48,230 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-18 18:01:48,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 18:01:48,231 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-18 18:01:48,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:48,232 INFO L225 Difference]: With dead ends: 63 [2020-08-18 18:01:48,232 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 18:01:48,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 18:01:48,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 18:01:48,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 18:01:48,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 18:01:48,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-18 18:01:48,235 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-18 18:01:48,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:48,236 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-18 18:01:48,236 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 18:01:48,236 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-18 18:01:48,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 18:01:48,236 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:48,236 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:48,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 18:01:48,236 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:48,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:48,237 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-18 18:01:48,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:48,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1840835413] [2020-08-18 18:01:48,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:48,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:49,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:49,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:49,904 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 18:01:49,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1840835413] [2020-08-18 18:01:49,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:49,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 18:01:49,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018019581] [2020-08-18 18:01:49,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 18:01:49,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:49,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 18:01:49,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 18:01:49,907 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-18 18:01:51,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:51,430 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-18 18:01:51,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-18 18:01:51,431 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-18 18:01:51,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:51,431 INFO L225 Difference]: With dead ends: 64 [2020-08-18 18:01:51,431 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 18:01:51,432 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 18:01:51,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 18:01:51,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-18 18:01:51,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 18:01:51,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-18 18:01:51,436 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-18 18:01:51,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:51,436 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-18 18:01:51,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-18 18:01:51,436 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-18 18:01:51,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 18:01:51,437 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:51,437 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:51,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-18 18:01:51,437 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:51,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:51,438 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-18 18:01:51,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:51,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055606942] [2020-08-18 18:01:51,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:51,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat