/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/nested9.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:45:24,296 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:45:24,301 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:45:24,322 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:45:24,322 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:45:24,325 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:45:24,327 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:45:24,338 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:45:24,341 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:45:24,343 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:45:24,344 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:45:24,348 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:45:24,348 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:45:24,350 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:45:24,353 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:45:24,355 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:45:24,358 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:45:24,359 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:45:24,362 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:45:24,367 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:45:24,373 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:45:24,377 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:45:24,378 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:45:24,379 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:45:24,382 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 11:45:24,394 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:45:24,394 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:45:24,396 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:45:24,397 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 11:45:24,427 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:45:24,430 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:45:24,432 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:45:24,432 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:45:24,432 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:45:24,433 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:45:24,433 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:45:24,433 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:45:24,433 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:45:24,433 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:45:24,434 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:45:24,434 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:45:24,434 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:45:24,434 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:45:24,434 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:45:24,434 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:45:24,435 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:45:24,435 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:45:24,435 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:45:24,435 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:45:24,435 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:45:24,436 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:45:24,436 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:45:24,436 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:45:24,436 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:45:24,436 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:45:24,437 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:24,437 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:45:24,437 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:45:24,437 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 -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-21 11:45:24,752 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:45:24,766 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:45:24,770 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:45:24,771 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:45:24,772 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:45:24,773 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-21 11:45:24,844 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/77adba6a1/1f187bb7e6564e4b937f7776be2ef256/FLAGdc5062b0a [2020-07-21 11:45:25,355 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:45:25,356 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-21 11:45:25,363 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/77adba6a1/1f187bb7e6564e4b937f7776be2ef256/FLAGdc5062b0a [2020-07-21 11:45:25,642 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/77adba6a1/1f187bb7e6564e4b937f7776be2ef256 [2020-07-21 11:45:25,652 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:45:25,655 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:45:25,656 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:45:25,656 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:45:25,660 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:45:25,661 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:45:25" (1/1) ... [2020-07-21 11:45:25,664 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7269e0db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:45:25, skipping insertion in model container [2020-07-21 11:45:25,664 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:45:25" (1/1) ... [2020-07-21 11:45:25,672 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:45:25,691 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:45:25,870 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:45:25,875 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:45:25,895 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:45:25,910 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:45:25,911 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:45:25 WrapperNode [2020-07-21 11:45:25,911 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:45:25,912 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:45:25,912 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:45:25,912 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:45:25,926 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:45:25" (1/1) ... [2020-07-21 11:45:25,927 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:45:25" (1/1) ... [2020-07-21 11:45:25,933 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:45:25" (1/1) ... [2020-07-21 11:45:25,933 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:45:25" (1/1) ... [2020-07-21 11:45:25,938 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:45:25" (1/1) ... [2020-07-21 11:45:25,944 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:45:25" (1/1) ... [2020-07-21 11:45:25,946 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:45:25" (1/1) ... [2020-07-21 11:45:25,948 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:45:25,948 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:45:25,949 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:45:25,949 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:45:25,950 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:45:25" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-07-21 11:45:26,092 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:45:26,092 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:45:26,092 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 11:45:26,093 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 11:45:26,093 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:45:26,093 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:45:26,093 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 11:45:26,093 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 11:45:26,093 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 11:45:26,093 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 11:45:26,094 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:45:26,094 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:45:26,094 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:45:26,341 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:45:26,341 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 11:45:26,345 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:45:26 BoogieIcfgContainer [2020-07-21 11:45:26,345 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:45:26,347 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:45:26,347 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:45:26,350 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:45:26,350 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:45:25" (1/3) ... [2020-07-21 11:45:26,351 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38cdaa92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:45:26, skipping insertion in model container [2020-07-21 11:45:26,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:45:25" (2/3) ... [2020-07-21 11:45:26,352 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38cdaa92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:45:26, skipping insertion in model container [2020-07-21 11:45:26,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:45:26" (3/3) ... [2020-07-21 11:45:26,354 INFO L109 eAbstractionObserver]: Analyzing ICFG nested9.i [2020-07-21 11:45:26,366 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:45:26,373 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:45:26,389 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:45:26,439 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:45:26,440 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:45:26,440 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:45:26,441 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:45:26,441 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:45:26,441 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:45:26,441 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:45:26,442 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:45:26,498 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-21 11:45:26,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 11:45:26,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:26,507 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:26,508 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:26,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:26,514 INFO L82 PathProgramCache]: Analyzing trace with hash 1671060194, now seen corresponding path program 1 times [2020-07-21 11:45:26,526 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:26,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [208394871] [2020-07-21 11:45:26,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:26,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:26,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:45:26,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:26,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:45:26,682 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:45:26,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [208394871] [2020-07-21 11:45:26,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:45:26,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 11:45:26,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213545967] [2020-07-21 11:45:26,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 11:45:26,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:26,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 11:45:26,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 11:45:26,705 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 4 states. [2020-07-21 11:45:26,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:26,784 INFO L93 Difference]: Finished difference Result 53 states and 74 transitions. [2020-07-21 11:45:26,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 11:45:26,786 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-07-21 11:45:26,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:26,796 INFO L225 Difference]: With dead ends: 53 [2020-07-21 11:45:26,797 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 11:45:26,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 11:45:26,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 11:45:26,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2020-07-21 11:45:26,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 11:45:26,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-07-21 11:45:26,846 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2020-07-21 11:45:26,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:26,847 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-07-21 11:45:26,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 11:45:26,847 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-07-21 11:45:26,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 11:45:26,849 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:26,849 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:27,063 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:27,063 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:27,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:27,065 INFO L82 PathProgramCache]: Analyzing trace with hash 514965223, now seen corresponding path program 1 times [2020-07-21 11:45:27,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:27,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115946933] [2020-07-21 11:45:27,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:27,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:27,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 11:45:27,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:27,178 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:45:27,184 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:45:27,239 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:45:27,242 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:45:27,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115946933] [2020-07-21 11:45:27,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:45:27,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 11:45:27,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911312147] [2020-07-21 11:45:27,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 11:45:27,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:27,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 11:45:27,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 11:45:27,248 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 8 states. [2020-07-21 11:45:27,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:27,369 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-07-21 11:45:27,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 11:45:27,370 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-07-21 11:45:27,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:27,372 INFO L225 Difference]: With dead ends: 39 [2020-07-21 11:45:27,372 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 11:45:27,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 11:45:27,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 11:45:27,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 32. [2020-07-21 11:45:27,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 11:45:27,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 11:45:27,396 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 21 [2020-07-21 11:45:27,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:27,397 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 11:45:27,398 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 11:45:27,399 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 11:45:27,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 11:45:27,400 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:27,400 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:27,601 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:27,602 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:27,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:27,603 INFO L82 PathProgramCache]: Analyzing trace with hash -1134636734, now seen corresponding path program 1 times [2020-07-21 11:45:27,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:27,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493331293] [2020-07-21 11:45:27,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:27,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:27,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 11:45:27,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:27,729 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:45:27,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:27,803 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:45:27,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493331293] [2020-07-21 11:45:27,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:27,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 11:45:27,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743954394] [2020-07-21 11:45:27,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 11:45:27,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:27,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 11:45:27,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-07-21 11:45:27,807 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 10 states. [2020-07-21 11:45:28,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:28,087 INFO L93 Difference]: Finished difference Result 65 states and 77 transitions. [2020-07-21 11:45:28,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 11:45:28,087 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-07-21 11:45:28,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:28,091 INFO L225 Difference]: With dead ends: 65 [2020-07-21 11:45:28,091 INFO L226 Difference]: Without dead ends: 46 [2020-07-21 11:45:28,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=65, Invalid=145, Unknown=0, NotChecked=0, Total=210 [2020-07-21 11:45:28,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-21 11:45:28,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 41. [2020-07-21 11:45:28,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 11:45:28,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2020-07-21 11:45:28,104 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 28 [2020-07-21 11:45:28,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:28,106 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2020-07-21 11:45:28,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 11:45:28,107 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2020-07-21 11:45:28,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 11:45:28,108 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:28,109 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:28,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:28,323 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:28,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:28,324 INFO L82 PathProgramCache]: Analyzing trace with hash 848296232, now seen corresponding path program 1 times [2020-07-21 11:45:28,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:28,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290741156] [2020-07-21 11:45:28,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:28,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:28,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 11:45:28,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:28,425 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 11:45:28,426 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:45:28,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290741156] [2020-07-21 11:45:28,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:45:28,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 11:45:28,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919851453] [2020-07-21 11:45:28,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 11:45:28,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:28,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 11:45:28,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:45:28,429 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand 6 states. [2020-07-21 11:45:28,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:28,518 INFO L93 Difference]: Finished difference Result 68 states and 81 transitions. [2020-07-21 11:45:28,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 11:45:28,519 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2020-07-21 11:45:28,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:28,521 INFO L225 Difference]: With dead ends: 68 [2020-07-21 11:45:28,521 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 11:45:28,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-21 11:45:28,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 11:45:28,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2020-07-21 11:45:28,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 11:45:28,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2020-07-21 11:45:28,542 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 34 [2020-07-21 11:45:28,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:28,543 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2020-07-21 11:45:28,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 11:45:28,543 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2020-07-21 11:45:28,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 11:45:28,546 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:28,547 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:28,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:28,764 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:28,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:28,765 INFO L82 PathProgramCache]: Analyzing trace with hash -670641491, now seen corresponding path program 2 times [2020-07-21 11:45:28,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:28,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [610499329] [2020-07-21 11:45:28,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:28,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:28,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 11:45:28,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:28,875 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:45:28,877 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:45:28,900 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 11:45:28,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:28,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:45:28,995 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 11:45:28,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [610499329] [2020-07-21 11:45:28,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:28,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-21 11:45:28,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738820554] [2020-07-21 11:45:28,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 11:45:28,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:28,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 11:45:28,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2020-07-21 11:45:28,998 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand 15 states. [2020-07-21 11:45:29,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:29,401 INFO L93 Difference]: Finished difference Result 78 states and 94 transitions. [2020-07-21 11:45:29,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 11:45:29,402 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 41 [2020-07-21 11:45:29,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:29,404 INFO L225 Difference]: With dead ends: 78 [2020-07-21 11:45:29,405 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 11:45:29,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 65 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=179, Invalid=373, Unknown=0, NotChecked=0, Total=552 [2020-07-21 11:45:29,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 11:45:29,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 54. [2020-07-21 11:45:29,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 11:45:29,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2020-07-21 11:45:29,420 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 41 [2020-07-21 11:45:29,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:29,421 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2020-07-21 11:45:29,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 11:45:29,421 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2020-07-21 11:45:29,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-21 11:45:29,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:29,423 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:29,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:29,636 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:29,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:29,637 INFO L82 PathProgramCache]: Analyzing trace with hash 1941695900, now seen corresponding path program 3 times [2020-07-21 11:45:29,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:29,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [60524215] [2020-07-21 11:45:29,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:29,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:29,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 11:45:29,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:29,802 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 60 proven. 19 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-07-21 11:45:29,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:29,886 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 40 proven. 19 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-07-21 11:45:29,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [60524215] [2020-07-21 11:45:29,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:29,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2020-07-21 11:45:29,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536598620] [2020-07-21 11:45:29,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 11:45:29,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:29,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 11:45:29,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2020-07-21 11:45:29,890 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand 13 states. [2020-07-21 11:45:30,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:30,337 INFO L93 Difference]: Finished difference Result 127 states and 164 transitions. [2020-07-21 11:45:30,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 11:45:30,339 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 62 [2020-07-21 11:45:30,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:30,341 INFO L225 Difference]: With dead ends: 127 [2020-07-21 11:45:30,341 INFO L226 Difference]: Without dead ends: 95 [2020-07-21 11:45:30,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 109 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=169, Invalid=431, Unknown=0, NotChecked=0, Total=600 [2020-07-21 11:45:30,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-21 11:45:30,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 64. [2020-07-21 11:45:30,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 11:45:30,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2020-07-21 11:45:30,356 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 62 [2020-07-21 11:45:30,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:30,356 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2020-07-21 11:45:30,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 11:45:30,357 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2020-07-21 11:45:30,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-07-21 11:45:30,358 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:30,358 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:30,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:30,572 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:30,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:30,573 INFO L82 PathProgramCache]: Analyzing trace with hash 1583260034, now seen corresponding path program 4 times [2020-07-21 11:45:30,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:30,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571310502] [2020-07-21 11:45:30,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:30,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:30,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 11:45:30,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:30,704 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 88 proven. 7 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 11:45:30,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:30,787 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 61 proven. 10 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 11:45:30,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571310502] [2020-07-21 11:45:30,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:30,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 11:45:30,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617203715] [2020-07-21 11:45:30,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 11:45:30,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:30,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 11:45:30,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2020-07-21 11:45:30,791 INFO L87 Difference]: Start difference. First operand 64 states and 78 transitions. Second operand 11 states. [2020-07-21 11:45:31,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:31,003 INFO L93 Difference]: Finished difference Result 123 states and 153 transitions. [2020-07-21 11:45:31,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 11:45:31,003 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 72 [2020-07-21 11:45:31,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:31,005 INFO L225 Difference]: With dead ends: 123 [2020-07-21 11:45:31,005 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 11:45:31,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 131 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-07-21 11:45:31,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 11:45:31,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-07-21 11:45:31,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 11:45:31,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2020-07-21 11:45:31,018 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 72 [2020-07-21 11:45:31,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:31,018 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2020-07-21 11:45:31,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 11:45:31,019 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2020-07-21 11:45:31,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 11:45:31,020 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:31,020 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:31,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:31,235 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:31,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:31,236 INFO L82 PathProgramCache]: Analyzing trace with hash 1833574291, now seen corresponding path program 5 times [2020-07-21 11:45:31,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:31,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314646645] [2020-07-21 11:45:31,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:31,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:31,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 11:45:31,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:31,423 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 75 proven. 62 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-07-21 11:45:31,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:31,555 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 53 proven. 62 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-07-21 11:45:31,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314646645] [2020-07-21 11:45:31,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:31,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2020-07-21 11:45:31,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731185857] [2020-07-21 11:45:31,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 11:45:31,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:31,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 11:45:31,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 11:45:31,558 INFO L87 Difference]: Start difference. First operand 64 states and 74 transitions. Second operand 17 states. [2020-07-21 11:45:32,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:32,334 INFO L93 Difference]: Finished difference Result 132 states and 162 transitions. [2020-07-21 11:45:32,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 11:45:32,336 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 79 [2020-07-21 11:45:32,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:32,337 INFO L225 Difference]: With dead ends: 132 [2020-07-21 11:45:32,337 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 11:45:32,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=307, Invalid=815, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 11:45:32,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 11:45:32,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 78. [2020-07-21 11:45:32,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 11:45:32,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 94 transitions. [2020-07-21 11:45:32,355 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 94 transitions. Word has length 79 [2020-07-21 11:45:32,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:32,355 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 94 transitions. [2020-07-21 11:45:32,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 11:45:32,356 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 94 transitions. [2020-07-21 11:45:32,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-07-21 11:45:32,357 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:32,357 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:32,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:32,572 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:32,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:32,573 INFO L82 PathProgramCache]: Analyzing trace with hash -832577267, now seen corresponding path program 6 times [2020-07-21 11:45:32,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:32,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729820063] [2020-07-21 11:45:32,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:32,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:32,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 11:45:32,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:32,758 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 216 proven. 32 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 11:45:32,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:32,900 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 127 proven. 49 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-21 11:45:32,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729820063] [2020-07-21 11:45:32,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:32,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-21 11:45:32,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868193444] [2020-07-21 11:45:32,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 11:45:32,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:32,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 11:45:32,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2020-07-21 11:45:32,903 INFO L87 Difference]: Start difference. First operand 78 states and 94 transitions. Second operand 15 states. [2020-07-21 11:45:33,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:33,306 INFO L93 Difference]: Finished difference Result 140 states and 176 transitions. [2020-07-21 11:45:33,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 11:45:33,308 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 99 [2020-07-21 11:45:33,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:33,310 INFO L225 Difference]: With dead ends: 140 [2020-07-21 11:45:33,310 INFO L226 Difference]: Without dead ends: 96 [2020-07-21 11:45:33,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 181 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=171, Invalid=381, Unknown=0, NotChecked=0, Total=552 [2020-07-21 11:45:33,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-07-21 11:45:33,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 86. [2020-07-21 11:45:33,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-21 11:45:33,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 104 transitions. [2020-07-21 11:45:33,342 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 104 transitions. Word has length 99 [2020-07-21 11:45:33,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:33,343 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 104 transitions. [2020-07-21 11:45:33,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 11:45:33,343 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 104 transitions. [2020-07-21 11:45:33,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 11:45:33,354 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:33,355 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:33,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:33,568 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:33,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:33,568 INFO L82 PathProgramCache]: Analyzing trace with hash -1419871984, now seen corresponding path program 7 times [2020-07-21 11:45:33,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:33,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82959501] [2020-07-21 11:45:33,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:33,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:33,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 11:45:33,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:33,758 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 106 proven. 124 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-07-21 11:45:33,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:33,894 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 72 proven. 124 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2020-07-21 11:45:33,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82959501] [2020-07-21 11:45:33,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:33,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2020-07-21 11:45:33,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285731306] [2020-07-21 11:45:33,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 11:45:33,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:33,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 11:45:33,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2020-07-21 11:45:33,897 INFO L87 Difference]: Start difference. First operand 86 states and 104 transitions. Second operand 16 states. [2020-07-21 11:45:34,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:34,739 INFO L93 Difference]: Finished difference Result 169 states and 212 transitions. [2020-07-21 11:45:34,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 11:45:34,741 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 106 [2020-07-21 11:45:34,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:34,742 INFO L225 Difference]: With dead ends: 169 [2020-07-21 11:45:34,743 INFO L226 Difference]: Without dead ends: 122 [2020-07-21 11:45:34,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 193 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=395, Invalid=1165, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 11:45:34,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-21 11:45:34,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 99. [2020-07-21 11:45:34,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-21 11:45:34,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 121 transitions. [2020-07-21 11:45:34,762 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 121 transitions. Word has length 106 [2020-07-21 11:45:34,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:34,763 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 121 transitions. [2020-07-21 11:45:34,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 11:45:34,763 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 121 transitions. [2020-07-21 11:45:34,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-21 11:45:34,765 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:34,765 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:34,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:34,980 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:34,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:34,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1976134303, now seen corresponding path program 8 times [2020-07-21 11:45:34,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:34,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [323557762] [2020-07-21 11:45:34,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:35,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:35,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 11:45:35,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:35,142 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 338 proven. 56 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2020-07-21 11:45:35,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:35,285 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 212 proven. 62 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-21 11:45:35,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [323557762] [2020-07-21 11:45:35,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:35,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 11:45:35,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670344713] [2020-07-21 11:45:35,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 11:45:35,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:35,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 11:45:35,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2020-07-21 11:45:35,288 INFO L87 Difference]: Start difference. First operand 99 states and 121 transitions. Second operand 14 states. [2020-07-21 11:45:35,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:35,591 INFO L93 Difference]: Finished difference Result 186 states and 230 transitions. [2020-07-21 11:45:35,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 11:45:35,592 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 123 [2020-07-21 11:45:35,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:35,597 INFO L225 Difference]: With dead ends: 186 [2020-07-21 11:45:35,597 INFO L226 Difference]: Without dead ends: 99 [2020-07-21 11:45:35,600 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 229 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-07-21 11:45:35,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-21 11:45:35,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 91. [2020-07-21 11:45:35,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-07-21 11:45:35,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 107 transitions. [2020-07-21 11:45:35,628 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 107 transitions. Word has length 123 [2020-07-21 11:45:35,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:35,629 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 107 transitions. [2020-07-21 11:45:35,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 11:45:35,631 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 107 transitions. [2020-07-21 11:45:35,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-07-21 11:45:35,633 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:35,633 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:35,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:35,847 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:35,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:35,848 INFO L82 PathProgramCache]: Analyzing trace with hash -1688384554, now seen corresponding path program 9 times [2020-07-21 11:45:35,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:35,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043090164] [2020-07-21 11:45:35,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:35,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:35,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 11:45:35,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:36,053 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 61 proven. 271 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-21 11:45:36,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:36,230 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 61 proven. 271 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-21 11:45:36,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2043090164] [2020-07-21 11:45:36,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:36,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 20 [2020-07-21 11:45:36,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887428331] [2020-07-21 11:45:36,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 11:45:36,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:36,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 11:45:36,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2020-07-21 11:45:36,233 INFO L87 Difference]: Start difference. First operand 91 states and 107 transitions. Second operand 20 states. [2020-07-21 11:45:37,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:37,519 INFO L93 Difference]: Finished difference Result 177 states and 219 transitions. [2020-07-21 11:45:37,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 11:45:37,523 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 130 [2020-07-21 11:45:37,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:37,525 INFO L225 Difference]: With dead ends: 177 [2020-07-21 11:45:37,525 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 11:45:37,527 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 237 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 676 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=634, Invalid=1916, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 11:45:37,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 11:45:37,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 106. [2020-07-21 11:45:37,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-21 11:45:37,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 127 transitions. [2020-07-21 11:45:37,543 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 127 transitions. Word has length 130 [2020-07-21 11:45:37,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:37,544 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 127 transitions. [2020-07-21 11:45:37,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 11:45:37,544 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 127 transitions. [2020-07-21 11:45:37,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2020-07-21 11:45:37,546 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:37,546 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 16, 16, 16, 16, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:37,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:37,760 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:37,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:37,761 INFO L82 PathProgramCache]: Analyzing trace with hash -840848228, now seen corresponding path program 10 times [2020-07-21 11:45:37,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:37,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646560770] [2020-07-21 11:45:37,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:37,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:37,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 11:45:37,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:37,980 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 555 proven. 118 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2020-07-21 11:45:37,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:38,147 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 284 proven. 205 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2020-07-21 11:45:38,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646560770] [2020-07-21 11:45:38,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:38,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-21 11:45:38,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919966674] [2020-07-21 11:45:38,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 11:45:38,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:38,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 11:45:38,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2020-07-21 11:45:38,150 INFO L87 Difference]: Start difference. First operand 106 states and 127 transitions. Second operand 18 states. [2020-07-21 11:45:38,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:38,650 INFO L93 Difference]: Finished difference Result 155 states and 189 transitions. [2020-07-21 11:45:38,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 11:45:38,651 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 154 [2020-07-21 11:45:38,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:38,653 INFO L225 Difference]: With dead ends: 155 [2020-07-21 11:45:38,653 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 11:45:38,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 287 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=256, Invalid=614, Unknown=0, NotChecked=0, Total=870 [2020-07-21 11:45:38,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 11:45:38,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2020-07-21 11:45:38,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-07-21 11:45:38,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 141 transitions. [2020-07-21 11:45:38,671 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 141 transitions. Word has length 154 [2020-07-21 11:45:38,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:38,672 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 141 transitions. [2020-07-21 11:45:38,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 11:45:38,672 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 141 transitions. [2020-07-21 11:45:38,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2020-07-21 11:45:38,674 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:38,675 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:38,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:38,889 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:38,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:38,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1311982393, now seen corresponding path program 11 times [2020-07-21 11:45:38,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:38,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1782249536] [2020-07-21 11:45:38,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:38,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:38,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 11:45:38,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:39,077 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:45:39,079 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:45:39,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 476 proven. 26 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-21 11:45:39,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:39,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:45:39,330 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 80 proven. 422 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-21 11:45:39,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1782249536] [2020-07-21 11:45:39,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:39,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-21 11:45:39,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857576543] [2020-07-21 11:45:39,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 11:45:39,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:39,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 11:45:39,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2020-07-21 11:45:39,332 INFO L87 Difference]: Start difference. First operand 117 states and 141 transitions. Second operand 22 states. [2020-07-21 11:45:40,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:40,052 INFO L93 Difference]: Finished difference Result 166 states and 209 transitions. [2020-07-21 11:45:40,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 11:45:40,053 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 161 [2020-07-21 11:45:40,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:40,056 INFO L225 Difference]: With dead ends: 166 [2020-07-21 11:45:40,056 INFO L226 Difference]: Without dead ends: 164 [2020-07-21 11:45:40,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 297 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 421 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=526, Invalid=1034, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 11:45:40,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2020-07-21 11:45:40,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 136. [2020-07-21 11:45:40,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 11:45:40,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 169 transitions. [2020-07-21 11:45:40,080 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 169 transitions. Word has length 161 [2020-07-21 11:45:40,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:40,081 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 169 transitions. [2020-07-21 11:45:40,081 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 11:45:40,081 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 169 transitions. [2020-07-21 11:45:40,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2020-07-21 11:45:40,083 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:40,084 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 22, 22, 22, 22, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:40,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:40,297 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:40,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:40,298 INFO L82 PathProgramCache]: Analyzing trace with hash -90659728, now seen corresponding path program 12 times [2020-07-21 11:45:40,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:40,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [172128551] [2020-07-21 11:45:40,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:40,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:40,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 11:45:40,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:40,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 617 proven. 521 refuted. 0 times theorem prover too weak. 747 trivial. 0 not checked. [2020-07-21 11:45:40,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:40,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 337 proven. 521 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2020-07-21 11:45:40,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [172128551] [2020-07-21 11:45:40,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:40,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 24 [2020-07-21 11:45:40,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950950598] [2020-07-21 11:45:40,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 11:45:40,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:40,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 11:45:40,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2020-07-21 11:45:40,846 INFO L87 Difference]: Start difference. First operand 136 states and 169 transitions. Second operand 24 states. [2020-07-21 11:45:42,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:42,505 INFO L93 Difference]: Finished difference Result 267 states and 343 transitions. [2020-07-21 11:45:42,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 11:45:42,506 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 196 [2020-07-21 11:45:42,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:42,508 INFO L225 Difference]: With dead ends: 267 [2020-07-21 11:45:42,508 INFO L226 Difference]: Without dead ends: 188 [2020-07-21 11:45:42,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 365 SyntacticMatches, 4 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 982 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=931, Invalid=2609, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 11:45:42,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2020-07-21 11:45:42,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 156. [2020-07-21 11:45:42,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-21 11:45:42,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 197 transitions. [2020-07-21 11:45:42,534 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 197 transitions. Word has length 196 [2020-07-21 11:45:42,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:42,535 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 197 transitions. [2020-07-21 11:45:42,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 11:45:42,535 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 197 transitions. [2020-07-21 11:45:42,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2020-07-21 11:45:42,537 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:42,537 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 27, 26, 26, 26, 26, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:42,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:42,751 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:42,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:42,751 INFO L82 PathProgramCache]: Analyzing trace with hash -1782452330, now seen corresponding path program 13 times [2020-07-21 11:45:42,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:42,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033972627] [2020-07-21 11:45:42,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:42,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:42,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 11:45:42,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:43,052 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 1512 proven. 216 refuted. 0 times theorem prover too weak. 914 trivial. 0 not checked. [2020-07-21 11:45:43,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:43,308 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 729 proven. 405 refuted. 0 times theorem prover too weak. 1508 trivial. 0 not checked. [2020-07-21 11:45:43,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033972627] [2020-07-21 11:45:43,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:43,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-21 11:45:43,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123309815] [2020-07-21 11:45:43,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 11:45:43,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:43,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 11:45:43,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=356, Unknown=0, NotChecked=0, Total=462 [2020-07-21 11:45:43,311 INFO L87 Difference]: Start difference. First operand 156 states and 197 transitions. Second operand 22 states. [2020-07-21 11:45:44,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:44,112 INFO L93 Difference]: Finished difference Result 289 states and 385 transitions. [2020-07-21 11:45:44,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 11:45:44,112 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 230 [2020-07-21 11:45:44,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:44,114 INFO L225 Difference]: With dead ends: 289 [2020-07-21 11:45:44,115 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 11:45:44,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 435 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=453, Invalid=1107, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 11:45:44,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 11:45:44,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 190. [2020-07-21 11:45:44,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 11:45:44,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 248 transitions. [2020-07-21 11:45:44,142 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 248 transitions. Word has length 230 [2020-07-21 11:45:44,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:44,143 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 248 transitions. [2020-07-21 11:45:44,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 11:45:44,143 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 248 transitions. [2020-07-21 11:45:44,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 11:45:44,145 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:44,146 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:44,352 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:44,352 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:44,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:44,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1051553665, now seen corresponding path program 14 times [2020-07-21 11:45:44,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:44,353 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1155042287] [2020-07-21 11:45:44,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:44,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:44,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 11:45:44,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:44,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 893 proven. 639 refuted. 0 times theorem prover too weak. 1302 trivial. 0 not checked. [2020-07-21 11:45:44,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:44,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 463 proven. 639 refuted. 0 times theorem prover too weak. 1732 trivial. 0 not checked. [2020-07-21 11:45:44,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1155042287] [2020-07-21 11:45:44,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:44,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 19 [2020-07-21 11:45:44,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662736679] [2020-07-21 11:45:44,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 11:45:44,842 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:44,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 11:45:44,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2020-07-21 11:45:44,842 INFO L87 Difference]: Start difference. First operand 190 states and 248 transitions. Second operand 19 states. [2020-07-21 11:45:46,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:46,157 INFO L93 Difference]: Finished difference Result 456 states and 609 transitions. [2020-07-21 11:45:46,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-21 11:45:46,163 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 237 [2020-07-21 11:45:46,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:46,166 INFO L225 Difference]: With dead ends: 456 [2020-07-21 11:45:46,167 INFO L226 Difference]: Without dead ends: 353 [2020-07-21 11:45:46,168 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 451 SyntacticMatches, 5 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=720, Invalid=2360, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 11:45:46,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-21 11:45:46,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 254. [2020-07-21 11:45:46,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 11:45:46,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 331 transitions. [2020-07-21 11:45:46,223 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 331 transitions. Word has length 237 [2020-07-21 11:45:46,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:46,223 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 331 transitions. [2020-07-21 11:45:46,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 11:45:46,224 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 331 transitions. [2020-07-21 11:45:46,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2020-07-21 11:45:46,226 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:46,227 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 31, 30, 30, 30, 30, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:46,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:46,438 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:46,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:46,439 INFO L82 PathProgramCache]: Analyzing trace with hash 1090659833, now seen corresponding path program 15 times [2020-07-21 11:45:46,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:46,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1424944215] [2020-07-21 11:45:46,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:46,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:46,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 11:45:46,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:46,713 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1869 proven. 216 refuted. 0 times theorem prover too weak. 1421 trivial. 0 not checked. [2020-07-21 11:45:46,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:46,931 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1121 proven. 226 refuted. 0 times theorem prover too weak. 2159 trivial. 0 not checked. [2020-07-21 11:45:46,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1424944215] [2020-07-21 11:45:46,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:46,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-21 11:45:46,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812403835] [2020-07-21 11:45:46,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 11:45:46,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:46,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 11:45:46,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=203, Unknown=0, NotChecked=0, Total=272 [2020-07-21 11:45:46,943 INFO L87 Difference]: Start difference. First operand 254 states and 331 transitions. Second operand 17 states. [2020-07-21 11:45:47,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:47,399 INFO L93 Difference]: Finished difference Result 363 states and 479 transitions. [2020-07-21 11:45:47,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 11:45:47,400 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 261 [2020-07-21 11:45:47,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:47,402 INFO L225 Difference]: With dead ends: 363 [2020-07-21 11:45:47,402 INFO L226 Difference]: Without dead ends: 206 [2020-07-21 11:45:47,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 501 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=207, Invalid=495, Unknown=0, NotChecked=0, Total=702 [2020-07-21 11:45:47,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-07-21 11:45:47,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 206. [2020-07-21 11:45:47,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 11:45:47,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 266 transitions. [2020-07-21 11:45:47,431 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 266 transitions. Word has length 261 [2020-07-21 11:45:47,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:47,432 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 266 transitions. [2020-07-21 11:45:47,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 11:45:47,432 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 266 transitions. [2020-07-21 11:45:47,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2020-07-21 11:45:47,434 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:47,434 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:47,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:47,648 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:47,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:47,649 INFO L82 PathProgramCache]: Analyzing trace with hash -431748828, now seen corresponding path program 16 times [2020-07-21 11:45:47,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:47,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1625398789] [2020-07-21 11:45:47,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:47,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:47,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 11:45:47,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:47,955 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 904 proven. 1050 refuted. 0 times theorem prover too weak. 1773 trivial. 0 not checked. [2020-07-21 11:45:47,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:48,250 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 480 proven. 1050 refuted. 0 times theorem prover too weak. 2197 trivial. 0 not checked. [2020-07-21 11:45:48,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1625398789] [2020-07-21 11:45:48,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:48,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 23 [2020-07-21 11:45:48,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113476477] [2020-07-21 11:45:48,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 11:45:48,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:48,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 11:45:48,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=395, Unknown=0, NotChecked=0, Total=506 [2020-07-21 11:45:48,253 INFO L87 Difference]: Start difference. First operand 206 states and 266 transitions. Second operand 23 states. [2020-07-21 11:45:50,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:50,667 INFO L93 Difference]: Finished difference Result 373 states and 497 transitions. [2020-07-21 11:45:50,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-21 11:45:50,668 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 268 [2020-07-21 11:45:50,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:50,670 INFO L225 Difference]: With dead ends: 373 [2020-07-21 11:45:50,671 INFO L226 Difference]: Without dead ends: 260 [2020-07-21 11:45:50,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 588 GetRequests, 509 SyntacticMatches, 5 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1812 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1346, Invalid=4354, Unknown=0, NotChecked=0, Total=5700 [2020-07-21 11:45:50,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2020-07-21 11:45:50,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 224. [2020-07-21 11:45:50,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 11:45:50,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 290 transitions. [2020-07-21 11:45:50,715 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 290 transitions. Word has length 268 [2020-07-21 11:45:50,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:50,716 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 290 transitions. [2020-07-21 11:45:50,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 11:45:50,716 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 290 transitions. [2020-07-21 11:45:50,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 11:45:50,719 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:50,719 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:50,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:50,926 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:50,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:50,927 INFO L82 PathProgramCache]: Analyzing trace with hash -935543841, now seen corresponding path program 17 times [2020-07-21 11:45:50,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:50,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875498078] [2020-07-21 11:45:50,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:51,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:51,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 11:45:51,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:51,256 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 2497 proven. 343 refuted. 0 times theorem prover too weak. 1903 trivial. 0 not checked. [2020-07-21 11:45:51,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:51,557 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 1289 proven. 633 refuted. 0 times theorem prover too weak. 2821 trivial. 0 not checked. [2020-07-21 11:45:51,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875498078] [2020-07-21 11:45:51,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:51,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-07-21 11:45:51,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106486918] [2020-07-21 11:45:51,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 11:45:51,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:51,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 11:45:51,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=321, Unknown=0, NotChecked=0, Total=420 [2020-07-21 11:45:51,559 INFO L87 Difference]: Start difference. First operand 224 states and 290 transitions. Second operand 21 states. [2020-07-21 11:45:52,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:52,273 INFO L93 Difference]: Finished difference Result 320 states and 421 transitions. [2020-07-21 11:45:52,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 11:45:52,274 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 299 [2020-07-21 11:45:52,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:52,276 INFO L225 Difference]: With dead ends: 320 [2020-07-21 11:45:52,276 INFO L226 Difference]: Without dead ends: 224 [2020-07-21 11:45:52,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 573 SyntacticMatches, 5 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=384, Invalid=948, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 11:45:52,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-21 11:45:52,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 193. [2020-07-21 11:45:52,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2020-07-21 11:45:52,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 241 transitions. [2020-07-21 11:45:52,307 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 241 transitions. Word has length 299 [2020-07-21 11:45:52,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:52,308 INFO L479 AbstractCegarLoop]: Abstraction has 193 states and 241 transitions. [2020-07-21 11:45:52,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 11:45:52,308 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 241 transitions. [2020-07-21 11:45:52,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2020-07-21 11:45:52,310 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:52,310 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 37, 36, 36, 36, 36, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:52,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:52,524 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:52,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:52,525 INFO L82 PathProgramCache]: Analyzing trace with hash 221652094, now seen corresponding path program 18 times [2020-07-21 11:45:52,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:52,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1195119528] [2020-07-21 11:45:52,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:52,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:52,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 11:45:52,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:53,099 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 870 proven. 1638 refuted. 0 times theorem prover too weak. 2492 trivial. 0 not checked. [2020-07-21 11:45:53,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:53,495 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 480 proven. 1638 refuted. 0 times theorem prover too weak. 2882 trivial. 0 not checked. [2020-07-21 11:45:53,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1195119528] [2020-07-21 11:45:53,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:53,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 27 [2020-07-21 11:45:53,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530429955] [2020-07-21 11:45:53,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 11:45:53,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:53,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 11:45:53,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=556, Unknown=0, NotChecked=0, Total=702 [2020-07-21 11:45:53,498 INFO L87 Difference]: Start difference. First operand 193 states and 241 transitions. Second operand 27 states. [2020-07-21 11:45:56,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:56,543 INFO L93 Difference]: Finished difference Result 335 states and 432 transitions. [2020-07-21 11:45:56,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2020-07-21 11:45:56,544 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 306 [2020-07-21 11:45:56,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:56,547 INFO L225 Difference]: With dead ends: 335 [2020-07-21 11:45:56,547 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 11:45:56,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 669 GetRequests, 581 SyntacticMatches, 5 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2259 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1692, Invalid=5448, Unknown=0, NotChecked=0, Total=7140 [2020-07-21 11:45:56,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 11:45:56,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 214. [2020-07-21 11:45:56,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2020-07-21 11:45:56,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 269 transitions. [2020-07-21 11:45:56,600 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 269 transitions. Word has length 306 [2020-07-21 11:45:56,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:56,603 INFO L479 AbstractCegarLoop]: Abstraction has 214 states and 269 transitions. [2020-07-21 11:45:56,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 11:45:56,603 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 269 transitions. [2020-07-21 11:45:56,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2020-07-21 11:45:56,608 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:56,608 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:56,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:56,824 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:56,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:56,824 INFO L82 PathProgramCache]: Analyzing trace with hash 856878168, now seen corresponding path program 19 times [2020-07-21 11:45:56,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:56,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2013451083] [2020-07-21 11:45:56,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:56,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:56,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 11:45:56,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:57,237 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 3324 proven. 515 refuted. 0 times theorem prover too weak. 2622 trivial. 0 not checked. [2020-07-21 11:45:57,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:57,709 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 1560 proven. 1145 refuted. 0 times theorem prover too weak. 3756 trivial. 0 not checked. [2020-07-21 11:45:57,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2013451083] [2020-07-21 11:45:57,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:57,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 25 [2020-07-21 11:45:57,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608872355] [2020-07-21 11:45:57,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 11:45:57,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:57,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 11:45:57,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=465, Unknown=0, NotChecked=0, Total=600 [2020-07-21 11:45:57,711 INFO L87 Difference]: Start difference. First operand 214 states and 269 transitions. Second operand 25 states. [2020-07-21 11:45:58,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:58,776 INFO L93 Difference]: Finished difference Result 327 states and 427 transitions. [2020-07-21 11:45:58,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 11:45:58,778 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 344 [2020-07-21 11:45:58,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:58,780 INFO L225 Difference]: With dead ends: 327 [2020-07-21 11:45:58,780 INFO L226 Difference]: Without dead ends: 262 [2020-07-21 11:45:58,781 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 710 GetRequests, 659 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=638, Invalid=1618, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 11:45:58,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-21 11:45:58,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 248. [2020-07-21 11:45:58,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-21 11:45:58,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 319 transitions. [2020-07-21 11:45:58,816 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 319 transitions. Word has length 344 [2020-07-21 11:45:58,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:58,816 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 319 transitions. [2020-07-21 11:45:58,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 11:45:58,816 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 319 transitions. [2020-07-21 11:45:58,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-21 11:45:58,818 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:58,818 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 43, 42, 42, 42, 42, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:59,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:59,019 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:59,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:59,020 INFO L82 PathProgramCache]: Analyzing trace with hash 930621925, now seen corresponding path program 20 times [2020-07-21 11:45:59,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:59,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1812762053] [2020-07-21 11:45:59,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:59,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:59,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 11:45:59,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:59,662 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 770 proven. 2457 refuted. 0 times theorem prover too weak. 3534 trivial. 0 not checked. [2020-07-21 11:45:59,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:00,295 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 454 proven. 2457 refuted. 0 times theorem prover too weak. 3850 trivial. 0 not checked. [2020-07-21 11:46:00,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1812762053] [2020-07-21 11:46:00,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:00,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 31 [2020-07-21 11:46:00,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010162074] [2020-07-21 11:46:00,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 11:46:00,297 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:00,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 11:46:00,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=743, Unknown=0, NotChecked=0, Total=930 [2020-07-21 11:46:00,298 INFO L87 Difference]: Start difference. First operand 248 states and 319 transitions. Second operand 31 states. [2020-07-21 11:46:04,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:04,231 INFO L93 Difference]: Finished difference Result 462 states and 609 transitions. [2020-07-21 11:46:04,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2020-07-21 11:46:04,232 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 351 [2020-07-21 11:46:04,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:04,236 INFO L225 Difference]: With dead ends: 462 [2020-07-21 11:46:04,236 INFO L226 Difference]: Without dead ends: 333 [2020-07-21 11:46:04,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 770 GetRequests, 667 SyntacticMatches, 5 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3218 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2462, Invalid=7438, Unknown=0, NotChecked=0, Total=9900 [2020-07-21 11:46:04,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-21 11:46:04,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 274. [2020-07-21 11:46:04,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-07-21 11:46:04,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 355 transitions. [2020-07-21 11:46:04,284 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 355 transitions. Word has length 351 [2020-07-21 11:46:04,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:04,285 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 355 transitions. [2020-07-21 11:46:04,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 11:46:04,285 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 355 transitions. [2020-07-21 11:46:04,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 400 [2020-07-21 11:46:04,288 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:04,288 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 49, 48, 48, 48, 48, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:04,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:04,498 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:04,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:04,499 INFO L82 PathProgramCache]: Analyzing trace with hash 1703194347, now seen corresponding path program 21 times [2020-07-21 11:46:04,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:04,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [732428679] [2020-07-21 11:46:04,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:04,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:04,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 11:46:04,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:05,043 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 4418 proven. 741 refuted. 0 times theorem prover too weak. 3654 trivial. 0 not checked. [2020-07-21 11:46:05,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:05,613 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 2002 proven. 1771 refuted. 0 times theorem prover too weak. 5040 trivial. 0 not checked. [2020-07-21 11:46:05,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [732428679] [2020-07-21 11:46:05,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:05,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 29 [2020-07-21 11:46:05,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514058260] [2020-07-21 11:46:05,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 11:46:05,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:05,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 11:46:05,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=635, Unknown=0, NotChecked=0, Total=812 [2020-07-21 11:46:05,616 INFO L87 Difference]: Start difference. First operand 274 states and 355 transitions. Second operand 29 states. [2020-07-21 11:46:07,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:07,148 INFO L93 Difference]: Finished difference Result 444 states and 593 transitions. [2020-07-21 11:46:07,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 11:46:07,149 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 399 [2020-07-21 11:46:07,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:07,152 INFO L225 Difference]: With dead ends: 444 [2020-07-21 11:46:07,152 INFO L226 Difference]: Without dead ends: 321 [2020-07-21 11:46:07,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 827 GetRequests, 765 SyntacticMatches, 5 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 704 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=969, Invalid=2453, Unknown=0, NotChecked=0, Total=3422 [2020-07-21 11:46:07,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-21 11:46:07,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 308. [2020-07-21 11:46:07,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 308 states. [2020-07-21 11:46:07,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 404 transitions. [2020-07-21 11:46:07,204 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 404 transitions. Word has length 399 [2020-07-21 11:46:07,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:07,205 INFO L479 AbstractCegarLoop]: Abstraction has 308 states and 404 transitions. [2020-07-21 11:46:07,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 11:46:07,205 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 404 transitions. [2020-07-21 11:46:07,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2020-07-21 11:46:07,208 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:07,208 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:07,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:07,423 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:07,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:07,424 INFO L82 PathProgramCache]: Analyzing trace with hash -1852909686, now seen corresponding path program 22 times [2020-07-21 11:46:07,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:07,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2131963464] [2020-07-21 11:46:07,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:07,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:07,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 729 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 11:46:07,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:07,817 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 1474 proven. 2579 refuted. 0 times theorem prover too weak. 5110 trivial. 0 not checked. [2020-07-21 11:46:07,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:08,249 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 762 proven. 2579 refuted. 0 times theorem prover too weak. 5822 trivial. 0 not checked. [2020-07-21 11:46:08,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2131963464] [2020-07-21 11:46:08,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:08,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 22 [2020-07-21 11:46:08,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667223603] [2020-07-21 11:46:08,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 11:46:08,251 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:08,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 11:46:08,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2020-07-21 11:46:08,252 INFO L87 Difference]: Start difference. First operand 308 states and 404 transitions. Second operand 22 states. [2020-07-21 11:46:10,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:10,425 INFO L93 Difference]: Finished difference Result 717 states and 960 transitions. [2020-07-21 11:46:10,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-21 11:46:10,425 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 406 [2020-07-21 11:46:10,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:10,430 INFO L225 Difference]: With dead ends: 717 [2020-07-21 11:46:10,430 INFO L226 Difference]: Without dead ends: 577 [2020-07-21 11:46:10,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 864 GetRequests, 785 SyntacticMatches, 6 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1840 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1240, Invalid=4310, Unknown=0, NotChecked=0, Total=5550 [2020-07-21 11:46:10,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2020-07-21 11:46:10,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 408. [2020-07-21 11:46:10,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-21 11:46:10,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 534 transitions. [2020-07-21 11:46:10,516 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 534 transitions. Word has length 406 [2020-07-21 11:46:10,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:10,517 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 534 transitions. [2020-07-21 11:46:10,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 11:46:10,518 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 534 transitions. [2020-07-21 11:46:10,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-21 11:46:10,522 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:10,522 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 53, 53, 53, 53, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:10,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:10,736 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:10,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:10,736 INFO L82 PathProgramCache]: Analyzing trace with hash 1246863545, now seen corresponding path program 23 times [2020-07-21 11:46:10,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:10,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1997357200] [2020-07-21 11:46:10,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:10,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:10,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 11:46:10,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:11,238 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 4963 proven. 592 refuted. 0 times theorem prover too weak. 5168 trivial. 0 not checked. [2020-07-21 11:46:11,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:11,861 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 3382 proven. 607 refuted. 0 times theorem prover too weak. 6734 trivial. 0 not checked. [2020-07-21 11:46:11,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1997357200] [2020-07-21 11:46:11,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:11,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-21 11:46:11,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999642957] [2020-07-21 11:46:11,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 11:46:11,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:11,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 11:46:11,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2020-07-21 11:46:11,864 INFO L87 Difference]: Start difference. First operand 408 states and 534 transitions. Second operand 20 states. [2020-07-21 11:46:12,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:12,536 INFO L93 Difference]: Finished difference Result 557 states and 738 transitions. [2020-07-21 11:46:12,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 11:46:12,537 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 437 [2020-07-21 11:46:12,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:12,539 INFO L225 Difference]: With dead ends: 557 [2020-07-21 11:46:12,540 INFO L226 Difference]: Without dead ends: 327 [2020-07-21 11:46:12,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 885 GetRequests, 849 SyntacticMatches, 6 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2020-07-21 11:46:12,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2020-07-21 11:46:12,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2020-07-21 11:46:12,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2020-07-21 11:46:12,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 426 transitions. [2020-07-21 11:46:12,602 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 426 transitions. Word has length 437 [2020-07-21 11:46:12,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:12,603 INFO L479 AbstractCegarLoop]: Abstraction has 327 states and 426 transitions. [2020-07-21 11:46:12,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 11:46:12,603 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 426 transitions. [2020-07-21 11:46:12,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2020-07-21 11:46:12,607 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:12,607 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 55, 54, 54, 54, 54, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:12,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:12,823 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:12,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:12,823 INFO L82 PathProgramCache]: Analyzing trace with hash -833030556, now seen corresponding path program 24 times [2020-07-21 11:46:12,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:12,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1421726416] [2020-07-21 11:46:12,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:12,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:12,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 11:46:12,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:13,316 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 1311 proven. 3537 refuted. 0 times theorem prover too weak. 6261 trivial. 0 not checked. [2020-07-21 11:46:13,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:13,844 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 705 proven. 3537 refuted. 0 times theorem prover too weak. 6867 trivial. 0 not checked. [2020-07-21 11:46:13,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1421726416] [2020-07-21 11:46:13,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:13,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 26 [2020-07-21 11:46:13,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477851650] [2020-07-21 11:46:13,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 11:46:13,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:13,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 11:46:13,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2020-07-21 11:46:13,846 INFO L87 Difference]: Start difference. First operand 327 states and 426 transitions. Second operand 26 states. [2020-07-21 11:46:17,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:17,800 INFO L93 Difference]: Finished difference Result 554 states and 739 transitions. [2020-07-21 11:46:17,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2020-07-21 11:46:17,800 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 444 [2020-07-21 11:46:17,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:17,803 INFO L225 Difference]: With dead ends: 554 [2020-07-21 11:46:17,804 INFO L226 Difference]: Without dead ends: 404 [2020-07-21 11:46:17,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 966 GetRequests, 857 SyntacticMatches, 6 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3949 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2420, Invalid=8500, Unknown=0, NotChecked=0, Total=10920 [2020-07-21 11:46:17,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2020-07-21 11:46:17,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 348. [2020-07-21 11:46:17,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 11:46:17,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 454 transitions. [2020-07-21 11:46:17,869 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 454 transitions. Word has length 444 [2020-07-21 11:46:17,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:17,870 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 454 transitions. [2020-07-21 11:46:17,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 11:46:17,870 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 454 transitions. [2020-07-21 11:46:17,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-21 11:46:17,874 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:17,874 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 60, 59, 59, 59, 59, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:18,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:18,091 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:18,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:18,091 INFO L82 PathProgramCache]: Analyzing trace with hash 1802445246, now seen corresponding path program 25 times [2020-07-21 11:46:18,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:18,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1416611635] [2020-07-21 11:46:18,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:18,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:18,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 861 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 11:46:18,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:18,612 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 6103 proven. 821 refuted. 0 times theorem prover too weak. 6319 trivial. 0 not checked. [2020-07-21 11:46:18,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:19,179 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 3581 proven. 1561 refuted. 0 times theorem prover too weak. 8101 trivial. 0 not checked. [2020-07-21 11:46:19,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1416611635] [2020-07-21 11:46:19,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:19,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2020-07-21 11:46:19,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480033332] [2020-07-21 11:46:19,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 11:46:19,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:19,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 11:46:19,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=424, Unknown=0, NotChecked=0, Total=552 [2020-07-21 11:46:19,181 INFO L87 Difference]: Start difference. First operand 348 states and 454 transitions. Second operand 24 states. [2020-07-21 11:46:20,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:20,206 INFO L93 Difference]: Finished difference Result 481 states and 637 transitions. [2020-07-21 11:46:20,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 11:46:20,207 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 482 [2020-07-21 11:46:20,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:20,210 INFO L225 Difference]: With dead ends: 481 [2020-07-21 11:46:20,210 INFO L226 Difference]: Without dead ends: 348 [2020-07-21 11:46:20,211 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 983 GetRequests, 935 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=533, Invalid=1359, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 11:46:20,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-07-21 11:46:20,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 348. [2020-07-21 11:46:20,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 11:46:20,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 452 transitions. [2020-07-21 11:46:20,274 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 452 transitions. Word has length 482 [2020-07-21 11:46:20,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:20,275 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 452 transitions. [2020-07-21 11:46:20,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 11:46:20,275 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 452 transitions. [2020-07-21 11:46:20,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 11:46:20,278 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:20,279 INFO L422 BasicCegarLoop]: trace histogram [61, 61, 61, 60, 60, 60, 60, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:20,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:20,494 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:20,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:20,494 INFO L82 PathProgramCache]: Analyzing trace with hash 564016575, now seen corresponding path program 26 times [2020-07-21 11:46:20,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:20,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1015192328] [2020-07-21 11:46:20,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:20,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:20,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 11:46:20,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:21,127 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 1082 proven. 4783 refuted. 0 times theorem prover too weak. 7807 trivial. 0 not checked. [2020-07-21 11:46:21,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:21,869 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 622 proven. 4783 refuted. 0 times theorem prover too weak. 8267 trivial. 0 not checked. [2020-07-21 11:46:21,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1015192328] [2020-07-21 11:46:21,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:21,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 30 [2020-07-21 11:46:21,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217851547] [2020-07-21 11:46:21,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 11:46:21,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:21,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 11:46:21,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=691, Unknown=0, NotChecked=0, Total=870 [2020-07-21 11:46:21,872 INFO L87 Difference]: Start difference. First operand 348 states and 452 transitions. Second operand 30 states. [2020-07-21 11:46:27,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:27,084 INFO L93 Difference]: Finished difference Result 561 states and 744 transitions. [2020-07-21 11:46:27,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2020-07-21 11:46:27,085 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 489 [2020-07-21 11:46:27,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:27,088 INFO L225 Difference]: With dead ends: 561 [2020-07-21 11:46:27,088 INFO L226 Difference]: Without dead ends: 408 [2020-07-21 11:46:27,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1069 GetRequests, 943 SyntacticMatches, 6 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5393 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3316, Invalid=11446, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 11:46:27,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-21 11:46:27,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 372. [2020-07-21 11:46:27,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-07-21 11:46:27,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 484 transitions. [2020-07-21 11:46:27,162 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 484 transitions. Word has length 489 [2020-07-21 11:46:27,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:27,162 INFO L479 AbstractCegarLoop]: Abstraction has 372 states and 484 transitions. [2020-07-21 11:46:27,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 11:46:27,163 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 484 transitions. [2020-07-21 11:46:27,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 535 [2020-07-21 11:46:27,168 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:27,168 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 67, 66, 66, 66, 66, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:27,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:27,383 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:27,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:27,384 INFO L82 PathProgramCache]: Analyzing trace with hash 869445188, now seen corresponding path program 27 times [2020-07-21 11:46:27,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:27,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [492661602] [2020-07-21 11:46:27,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:27,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:27,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 951 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 11:46:27,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:28,163 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 7544 proven. 1104 refuted. 0 times theorem prover too weak. 7854 trivial. 0 not checked. [2020-07-21 11:46:28,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:29,123 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 3915 proven. 2699 refuted. 0 times theorem prover too weak. 9888 trivial. 0 not checked. [2020-07-21 11:46:29,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [492661602] [2020-07-21 11:46:29,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:29,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 28 [2020-07-21 11:46:29,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259695690] [2020-07-21 11:46:29,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 11:46:29,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:29,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 11:46:29,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=588, Unknown=0, NotChecked=0, Total=756 [2020-07-21 11:46:29,126 INFO L87 Difference]: Start difference. First operand 372 states and 484 transitions. Second operand 28 states. [2020-07-21 11:46:30,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:30,736 INFO L93 Difference]: Finished difference Result 505 states and 666 transitions. [2020-07-21 11:46:30,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 11:46:30,737 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 534 [2020-07-21 11:46:30,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:30,740 INFO L225 Difference]: With dead ends: 505 [2020-07-21 11:46:30,740 INFO L226 Difference]: Without dead ends: 372 [2020-07-21 11:46:30,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1095 GetRequests, 1035 SyntacticMatches, 6 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=863, Invalid=2217, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 11:46:30,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2020-07-21 11:46:30,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 341. [2020-07-21 11:46:30,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-21 11:46:30,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 437 transitions. [2020-07-21 11:46:30,810 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 437 transitions. Word has length 534 [2020-07-21 11:46:30,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:30,811 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 437 transitions. [2020-07-21 11:46:30,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 11:46:30,811 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 437 transitions. [2020-07-21 11:46:30,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 542 [2020-07-21 11:46:30,816 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:30,816 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 68, 67, 67, 67, 67, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:31,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:31,030 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:31,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:31,031 INFO L82 PathProgramCache]: Analyzing trace with hash 943892089, now seen corresponding path program 28 times [2020-07-21 11:46:31,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:31,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [122213274] [2020-07-21 11:46:31,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:31,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:31,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 11:46:31,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:31,830 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 766 proven. 6380 refuted. 0 times theorem prover too weak. 9835 trivial. 0 not checked. [2020-07-21 11:46:31,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:32,640 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 504 proven. 6380 refuted. 0 times theorem prover too weak. 10097 trivial. 0 not checked. [2020-07-21 11:46:32,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [122213274] [2020-07-21 11:46:32,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:32,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 34 [2020-07-21 11:46:32,641 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181406083] [2020-07-21 11:46:32,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 11:46:32,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:32,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 11:46:32,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 11:46:32,642 INFO L87 Difference]: Start difference. First operand 341 states and 437 transitions. Second operand 34 states. [2020-07-21 11:46:38,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:38,909 INFO L93 Difference]: Finished difference Result 529 states and 691 transitions. [2020-07-21 11:46:38,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2020-07-21 11:46:38,910 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 541 [2020-07-21 11:46:38,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:38,913 INFO L225 Difference]: With dead ends: 529 [2020-07-21 11:46:38,913 INFO L226 Difference]: Without dead ends: 404 [2020-07-21 11:46:38,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1182 GetRequests, 1043 SyntacticMatches, 6 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6579 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=3980, Invalid=14110, Unknown=0, NotChecked=0, Total=18090 [2020-07-21 11:46:38,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2020-07-21 11:46:38,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 368. [2020-07-21 11:46:38,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 11:46:38,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 473 transitions. [2020-07-21 11:46:38,994 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 473 transitions. Word has length 541 [2020-07-21 11:46:38,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:38,995 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 473 transitions. [2020-07-21 11:46:38,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 11:46:38,995 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 473 transitions. [2020-07-21 11:46:39,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 594 [2020-07-21 11:46:39,000 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:39,000 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 75, 74, 74, 74, 74, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:39,214 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:39,215 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:39,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:39,216 INFO L82 PathProgramCache]: Analyzing trace with hash 1328811571, now seen corresponding path program 29 times [2020-07-21 11:46:39,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:39,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [943128536] [2020-07-21 11:46:39,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:39,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:39,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 1053 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 11:46:39,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:39,982 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 9340 proven. 1450 refuted. 0 times theorem prover too weak. 9860 trivial. 0 not checked. [2020-07-21 11:46:39,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:40,852 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 4438 proven. 4030 refuted. 0 times theorem prover too weak. 12182 trivial. 0 not checked. [2020-07-21 11:46:40,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [943128536] [2020-07-21 11:46:40,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:40,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 32 [2020-07-21 11:46:40,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718391338] [2020-07-21 11:46:40,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 11:46:40,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:40,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 11:46:40,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=778, Unknown=0, NotChecked=0, Total=992 [2020-07-21 11:46:40,854 INFO L87 Difference]: Start difference. First operand 368 states and 473 transitions. Second operand 32 states. [2020-07-21 11:46:42,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:42,612 INFO L93 Difference]: Finished difference Result 512 states and 672 transitions. [2020-07-21 11:46:42,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-21 11:46:42,613 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 593 [2020-07-21 11:46:42,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:42,615 INFO L225 Difference]: With dead ends: 512 [2020-07-21 11:46:42,615 INFO L226 Difference]: Without dead ends: 410 [2020-07-21 11:46:42,617 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1221 GetRequests, 1149 SyntacticMatches, 6 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1270, Invalid=3286, Unknown=0, NotChecked=0, Total=4556 [2020-07-21 11:46:42,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2020-07-21 11:46:42,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 402. [2020-07-21 11:46:42,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 402 states. [2020-07-21 11:46:42,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 521 transitions. [2020-07-21 11:46:42,676 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 521 transitions. Word has length 593 [2020-07-21 11:46:42,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:42,676 INFO L479 AbstractCegarLoop]: Abstraction has 402 states and 521 transitions. [2020-07-21 11:46:42,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 11:46:42,676 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 521 transitions. [2020-07-21 11:46:42,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 601 [2020-07-21 11:46:42,681 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:42,681 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 76, 75, 75, 75, 75, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:42,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:42,896 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:42,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:42,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1218530218, now seen corresponding path program 30 times [2020-07-21 11:46:42,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:42,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1110926587] [2020-07-21 11:46:42,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:43,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:43,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 1065 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 11:46:43,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:43,741 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 342 proven. 8400 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-21 11:46:43,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:44,676 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 342 proven. 8400 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-21 11:46:44,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1110926587] [2020-07-21 11:46:44,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:44,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 38 [2020-07-21 11:46:44,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374570164] [2020-07-21 11:46:44,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 11:46:44,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:44,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 11:46:44,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=1133, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 11:46:44,678 INFO L87 Difference]: Start difference. First operand 402 states and 521 transitions. Second operand 38 states. [2020-07-21 11:46:51,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:51,957 INFO L93 Difference]: Finished difference Result 711 states and 940 transitions. [2020-07-21 11:46:51,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2020-07-21 11:46:51,959 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 600 [2020-07-21 11:46:51,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:51,962 INFO L225 Difference]: With dead ends: 711 [2020-07-21 11:46:51,963 INFO L226 Difference]: Without dead ends: 529 [2020-07-21 11:46:51,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1313 GetRequests, 1157 SyntacticMatches, 6 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8485 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=5519, Invalid=17433, Unknown=0, NotChecked=0, Total=22952 [2020-07-21 11:46:51,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2020-07-21 11:46:52,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 434. [2020-07-21 11:46:52,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 434 states. [2020-07-21 11:46:52,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 565 transitions. [2020-07-21 11:46:52,046 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 565 transitions. Word has length 600 [2020-07-21 11:46:52,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:52,047 INFO L479 AbstractCegarLoop]: Abstraction has 434 states and 565 transitions. [2020-07-21 11:46:52,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 11:46:52,047 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 565 transitions. [2020-07-21 11:46:52,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 663 [2020-07-21 11:46:52,053 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:52,053 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 84, 83, 83, 83, 83, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:52,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:52,267 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:52,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:52,267 INFO L82 PathProgramCache]: Analyzing trace with hash -955730672, now seen corresponding path program 31 times [2020-07-21 11:46:52,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:52,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1334598978] [2020-07-21 11:46:52,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:52,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:52,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 11:46:52,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:53,219 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 11585 proven. 1868 refuted. 0 times theorem prover too weak. 12437 trivial. 0 not checked. [2020-07-21 11:46:53,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:54,293 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 5244 proven. 5563 refuted. 0 times theorem prover too weak. 15083 trivial. 0 not checked. [2020-07-21 11:46:54,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1334598978] [2020-07-21 11:46:54,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:54,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-21 11:46:54,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086130142] [2020-07-21 11:46:54,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 11:46:54,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:54,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 11:46:54,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=994, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 11:46:54,295 INFO L87 Difference]: Start difference. First operand 434 states and 565 transitions. Second operand 36 states. [2020-07-21 11:46:56,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:56,977 INFO L93 Difference]: Finished difference Result 642 states and 851 transitions. [2020-07-21 11:46:56,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-07-21 11:46:56,978 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 662 [2020-07-21 11:46:56,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:56,982 INFO L225 Difference]: With dead ends: 642 [2020-07-21 11:46:56,982 INFO L226 Difference]: Without dead ends: 476 [2020-07-21 11:46:56,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1368 GetRequests, 1283 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1415 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1819, Invalid=4661, Unknown=0, NotChecked=0, Total=6480 [2020-07-21 11:46:56,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2020-07-21 11:46:57,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 468. [2020-07-21 11:46:57,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 468 states. [2020-07-21 11:46:57,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 612 transitions. [2020-07-21 11:46:57,085 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 612 transitions. Word has length 662 [2020-07-21 11:46:57,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:57,086 INFO L479 AbstractCegarLoop]: Abstraction has 468 states and 612 transitions. [2020-07-21 11:46:57,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 11:46:57,086 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 612 transitions. [2020-07-21 11:46:57,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 670 [2020-07-21 11:46:57,092 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:57,092 INFO L422 BasicCegarLoop]: trace histogram [85, 85, 85, 84, 84, 84, 84, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:57,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:57,308 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:57,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:57,308 INFO L82 PathProgramCache]: Analyzing trace with hash 2116259269, now seen corresponding path program 32 times [2020-07-21 11:46:57,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:57,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1985980502] [2020-07-21 11:46:57,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:57,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:57,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 1185 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 11:46:57,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:57,981 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 2043 proven. 8366 refuted. 0 times theorem prover too weak. 16081 trivial. 0 not checked. [2020-07-21 11:46:57,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:58,781 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 1077 proven. 8366 refuted. 0 times theorem prover too weak. 17047 trivial. 0 not checked. [2020-07-21 11:46:58,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1985980502] [2020-07-21 11:46:58,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:58,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 25 [2020-07-21 11:46:58,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388478078] [2020-07-21 11:46:58,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 11:46:58,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:58,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 11:46:58,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=460, Unknown=0, NotChecked=0, Total=600 [2020-07-21 11:46:58,784 INFO L87 Difference]: Start difference. First operand 468 states and 612 transitions. Second operand 25 states. [2020-07-21 11:47:02,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:02,192 INFO L93 Difference]: Finished difference Result 1038 states and 1381 transitions. [2020-07-21 11:47:02,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-07-21 11:47:02,193 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 669 [2020-07-21 11:47:02,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:02,198 INFO L225 Difference]: With dead ends: 1038 [2020-07-21 11:47:02,198 INFO L226 Difference]: Without dead ends: 861 [2020-07-21 11:47:02,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1409 GetRequests, 1307 SyntacticMatches, 7 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3368 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2002, Invalid=7310, Unknown=0, NotChecked=0, Total=9312 [2020-07-21 11:47:02,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 861 states. [2020-07-21 11:47:02,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 861 to 613. [2020-07-21 11:47:02,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 613 states. [2020-07-21 11:47:02,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 613 states to 613 states and 801 transitions. [2020-07-21 11:47:02,320 INFO L78 Accepts]: Start accepts. Automaton has 613 states and 801 transitions. Word has length 669 [2020-07-21 11:47:02,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:02,321 INFO L479 AbstractCegarLoop]: Abstraction has 613 states and 801 transitions. [2020-07-21 11:47:02,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 11:47:02,321 INFO L276 IsEmpty]: Start isEmpty. Operand 613 states and 801 transitions. [2020-07-21 11:47:02,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 708 [2020-07-21 11:47:02,328 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:02,329 INFO L422 BasicCegarLoop]: trace histogram [90, 90, 90, 89, 89, 89, 89, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:47:02,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:02,543 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:02,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:02,544 INFO L82 PathProgramCache]: Analyzing trace with hash -1360123809, now seen corresponding path program 33 times [2020-07-21 11:47:02,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:02,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940597580] [2020-07-21 11:47:02,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:02,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:02,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 1251 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 11:47:02,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:03,210 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 12393 proven. 1325 refuted. 0 times theorem prover too weak. 16019 trivial. 0 not checked. [2020-07-21 11:47:03,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:04,052 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 9510 proven. 1346 refuted. 0 times theorem prover too weak. 18881 trivial. 0 not checked. [2020-07-21 11:47:04,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940597580] [2020-07-21 11:47:04,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:47:04,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-21 11:47:04,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458949761] [2020-07-21 11:47:04,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 11:47:04,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:47:04,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 11:47:04,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=383, Unknown=0, NotChecked=0, Total=506 [2020-07-21 11:47:04,054 INFO L87 Difference]: Start difference. First operand 613 states and 801 transitions. Second operand 23 states. [2020-07-21 11:47:04,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:04,931 INFO L93 Difference]: Finished difference Result 802 states and 1058 transitions. [2020-07-21 11:47:04,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 11:47:04,932 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 707 [2020-07-21 11:47:04,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:04,935 INFO L225 Difference]: With dead ends: 802 [2020-07-21 11:47:04,936 INFO L226 Difference]: Without dead ends: 490 [2020-07-21 11:47:04,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1428 GetRequests, 1385 SyntacticMatches, 7 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=395, Invalid=1011, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 11:47:04,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-21 11:47:05,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 490. [2020-07-21 11:47:05,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2020-07-21 11:47:05,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 638 transitions. [2020-07-21 11:47:05,018 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 638 transitions. Word has length 707 [2020-07-21 11:47:05,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:05,019 INFO L479 AbstractCegarLoop]: Abstraction has 490 states and 638 transitions. [2020-07-21 11:47:05,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 11:47:05,019 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 638 transitions. [2020-07-21 11:47:05,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 715 [2020-07-21 11:47:05,024 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:05,025 INFO L422 BasicCegarLoop]: trace histogram [91, 91, 91, 90, 90, 90, 90, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:47:05,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:05,226 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:05,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:05,226 INFO L82 PathProgramCache]: Analyzing trace with hash 1558816766, now seen corresponding path program 34 times [2020-07-21 11:47:05,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:05,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960365281] [2020-07-21 11:47:05,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:05,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:05,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 1263 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 11:47:05,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:06,024 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 1600 proven. 10313 refuted. 0 times theorem prover too weak. 18467 trivial. 0 not checked. [2020-07-21 11:47:06,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:06,959 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 900 proven. 10313 refuted. 0 times theorem prover too weak. 19167 trivial. 0 not checked. [2020-07-21 11:47:06,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960365281] [2020-07-21 11:47:06,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:47:06,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 29 [2020-07-21 11:47:06,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930491350] [2020-07-21 11:47:06,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 11:47:06,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:47:06,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 11:47:06,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=637, Unknown=0, NotChecked=0, Total=812 [2020-07-21 11:47:06,964 INFO L87 Difference]: Start difference. First operand 490 states and 638 transitions. Second operand 29 states. [2020-07-21 11:47:13,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:13,235 INFO L93 Difference]: Finished difference Result 794 states and 1055 transitions. [2020-07-21 11:47:13,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-07-21 11:47:13,237 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 714 [2020-07-21 11:47:13,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:13,240 INFO L225 Difference]: With dead ends: 794 [2020-07-21 11:47:13,240 INFO L226 Difference]: Without dead ends: 607 [2020-07-21 11:47:13,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1540 GetRequests, 1393 SyntacticMatches, 7 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8078 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=4264, Invalid=15758, Unknown=0, NotChecked=0, Total=20022 [2020-07-21 11:47:13,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2020-07-21 11:47:13,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 514. [2020-07-21 11:47:13,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-21 11:47:13,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 670 transitions. [2020-07-21 11:47:13,325 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 670 transitions. Word has length 714 [2020-07-21 11:47:13,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:13,325 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 670 transitions. [2020-07-21 11:47:13,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 11:47:13,326 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 670 transitions. [2020-07-21 11:47:13,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 760 [2020-07-21 11:47:13,332 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:13,332 INFO L422 BasicCegarLoop]: trace histogram [97, 97, 97, 96, 96, 96, 96, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:47:13,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:13,546 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:13,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:13,547 INFO L82 PathProgramCache]: Analyzing trace with hash 937711205, now seen corresponding path program 35 times [2020-07-21 11:47:13,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:13,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227465935] [2020-07-21 11:47:13,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:13,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:13,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 1341 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 11:47:13,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:14,452 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 14441 proven. 1702 refuted. 0 times theorem prover too weak. 18394 trivial. 0 not checked. [2020-07-21 11:47:14,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:15,516 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 9740 proven. 3289 refuted. 0 times theorem prover too weak. 21508 trivial. 0 not checked. [2020-07-21 11:47:15,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227465935] [2020-07-21 11:47:15,517 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:47:15,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2020-07-21 11:47:15,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332826962] [2020-07-21 11:47:15,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 11:47:15,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:47:15,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 11:47:15,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=541, Unknown=0, NotChecked=0, Total=702 [2020-07-21 11:47:15,518 INFO L87 Difference]: Start difference. First operand 514 states and 670 transitions. Second operand 27 states. [2020-07-21 11:47:16,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:16,941 INFO L93 Difference]: Finished difference Result 684 states and 902 transitions. [2020-07-21 11:47:16,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 11:47:16,942 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 759 [2020-07-21 11:47:16,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:16,946 INFO L225 Difference]: With dead ends: 684 [2020-07-21 11:47:16,946 INFO L226 Difference]: Without dead ends: 514 [2020-07-21 11:47:16,947 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1541 GetRequests, 1485 SyntacticMatches, 7 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 486 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=713, Invalid=1837, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 11:47:16,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-21 11:47:17,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 514. [2020-07-21 11:47:17,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-21 11:47:17,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 668 transitions. [2020-07-21 11:47:17,062 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 668 transitions. Word has length 759 [2020-07-21 11:47:17,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:17,063 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 668 transitions. [2020-07-21 11:47:17,063 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 11:47:17,063 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 668 transitions. [2020-07-21 11:47:17,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 767 [2020-07-21 11:47:17,070 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:17,070 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 98, 97, 97, 97, 97, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:47:17,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:17,284 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:17,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:17,285 INFO L82 PathProgramCache]: Analyzing trace with hash -661993672, now seen corresponding path program 36 times [2020-07-21 11:47:17,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:17,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [225706101] [2020-07-21 11:47:17,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:17,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:17,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 1353 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 11:47:17,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:18,325 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 1070 proven. 12705 refuted. 0 times theorem prover too weak. 21455 trivial. 0 not checked. [2020-07-21 11:47:18,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:19,473 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 688 proven. 12705 refuted. 0 times theorem prover too weak. 21837 trivial. 0 not checked. [2020-07-21 11:47:19,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [225706101] [2020-07-21 11:47:19,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:47:19,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 33 [2020-07-21 11:47:19,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606911521] [2020-07-21 11:47:19,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 11:47:19,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:47:19,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 11:47:19,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=840, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 11:47:19,476 INFO L87 Difference]: Start difference. First operand 514 states and 668 transitions. Second operand 33 states. [2020-07-21 11:47:28,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:28,352 INFO L93 Difference]: Finished difference Result 793 states and 1047 transitions. [2020-07-21 11:47:28,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2020-07-21 11:47:28,354 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 766 [2020-07-21 11:47:28,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:28,358 INFO L225 Difference]: With dead ends: 793 [2020-07-21 11:47:28,358 INFO L226 Difference]: Without dead ends: 603 [2020-07-21 11:47:28,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1662 GetRequests, 1493 SyntacticMatches, 7 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10746 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=5648, Invalid=21084, Unknown=0, NotChecked=0, Total=26732 [2020-07-21 11:47:28,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2020-07-21 11:47:28,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 541. [2020-07-21 11:47:28,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-21 11:47:28,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 704 transitions. [2020-07-21 11:47:28,435 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 704 transitions. Word has length 766 [2020-07-21 11:47:28,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:28,435 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 704 transitions. [2020-07-21 11:47:28,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 11:47:28,435 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 704 transitions. [2020-07-21 11:47:28,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 819 [2020-07-21 11:47:28,440 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:28,441 INFO L422 BasicCegarLoop]: trace histogram [105, 105, 105, 104, 104, 104, 104, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:47:28,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:28,642 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:28,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:28,642 INFO L82 PathProgramCache]: Analyzing trace with hash -1871274638, now seen corresponding path program 37 times [2020-07-21 11:47:28,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:28,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1399740894] [2020-07-21 11:47:28,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:28,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:28,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 1443 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 11:47:28,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:29,699 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 16938 proven. 2142 refuted. 0 times theorem prover too weak. 21360 trivial. 0 not checked. [2020-07-21 11:47:29,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:30,986 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 10143 proven. 5535 refuted. 0 times theorem prover too weak. 24762 trivial. 0 not checked. [2020-07-21 11:47:30,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1399740894] [2020-07-21 11:47:30,986 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:47:30,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 31 [2020-07-21 11:47:30,987 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635498762] [2020-07-21 11:47:30,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 11:47:30,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:47:30,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 11:47:30,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=725, Unknown=0, NotChecked=0, Total=930 [2020-07-21 11:47:30,988 INFO L87 Difference]: Start difference. First operand 541 states and 704 transitions. Second operand 31 states. [2020-07-21 11:47:32,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:32,963 INFO L93 Difference]: Finished difference Result 711 states and 935 transitions. [2020-07-21 11:47:32,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 11:47:32,965 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 818 [2020-07-21 11:47:32,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:32,969 INFO L225 Difference]: With dead ends: 711 [2020-07-21 11:47:32,969 INFO L226 Difference]: Without dead ends: 541 [2020-07-21 11:47:32,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1668 GetRequests, 1599 SyntacticMatches, 7 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 841 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1113, Invalid=2919, Unknown=0, NotChecked=0, Total=4032 [2020-07-21 11:47:32,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2020-07-21 11:47:33,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 541. [2020-07-21 11:47:33,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-21 11:47:33,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 702 transitions. [2020-07-21 11:47:33,085 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 702 transitions. Word has length 818 [2020-07-21 11:47:33,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:33,086 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 702 transitions. [2020-07-21 11:47:33,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 11:47:33,086 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 702 transitions. [2020-07-21 11:47:33,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 826 [2020-07-21 11:47:33,094 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:33,095 INFO L422 BasicCegarLoop]: trace histogram [106, 106, 106, 105, 105, 105, 105, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:47:33,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:33,308 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:33,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:33,309 INFO L82 PathProgramCache]: Analyzing trace with hash -778442869, now seen corresponding path program 38 times [2020-07-21 11:47:33,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:33,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1040705209] [2020-07-21 11:47:33,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:33,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:33,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 1455 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 11:47:33,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:34,489 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 432 proven. 15614 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-21 11:47:34,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:35,907 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 432 proven. 15614 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-21 11:47:35,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1040705209] [2020-07-21 11:47:35,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:47:35,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 37 [2020-07-21 11:47:35,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407837891] [2020-07-21 11:47:35,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 11:47:35,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:47:35,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 11:47:35,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1069, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 11:47:35,910 INFO L87 Difference]: Start difference. First operand 541 states and 702 transitions. Second operand 37 states. [2020-07-21 11:47:48,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:48,304 INFO L93 Difference]: Finished difference Result 800 states and 1052 transitions. [2020-07-21 11:47:48,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2020-07-21 11:47:48,305 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 825 [2020-07-21 11:47:48,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:48,309 INFO L225 Difference]: With dead ends: 800 [2020-07-21 11:47:48,309 INFO L226 Difference]: Without dead ends: 607 [2020-07-21 11:47:48,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1800 GetRequests, 1607 SyntacticMatches, 7 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14327 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=7368, Invalid=27788, Unknown=0, NotChecked=0, Total=35156 [2020-07-21 11:47:48,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2020-07-21 11:47:48,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 571. [2020-07-21 11:47:48,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 571 states. [2020-07-21 11:47:48,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 571 states to 571 states and 742 transitions. [2020-07-21 11:47:48,400 INFO L78 Accepts]: Start accepts. Automaton has 571 states and 742 transitions. Word has length 825 [2020-07-21 11:47:48,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:48,401 INFO L479 AbstractCegarLoop]: Abstraction has 571 states and 742 transitions. [2020-07-21 11:47:48,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 11:47:48,401 INFO L276 IsEmpty]: Start isEmpty. Operand 571 states and 742 transitions. [2020-07-21 11:47:48,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 885 [2020-07-21 11:47:48,406 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:48,407 INFO L422 BasicCegarLoop]: trace histogram [114, 114, 114, 113, 113, 113, 113, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:47:48,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:48,608 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:48,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:48,609 INFO L82 PathProgramCache]: Analyzing trace with hash -1882081448, now seen corresponding path program 39 times [2020-07-21 11:47:48,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:48,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031657026] [2020-07-21 11:47:48,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:48,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:48,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 1557 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 11:47:48,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:49,889 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 19947 proven. 2654 refuted. 0 times theorem prover too weak. 25016 trivial. 0 not checked. [2020-07-21 11:47:49,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:51,703 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 10782 proven. 8093 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2020-07-21 11:47:51,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031657026] [2020-07-21 11:47:51,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:47:51,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-21 11:47:51,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484222223] [2020-07-21 11:47:51,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 11:47:51,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:47:51,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 11:47:51,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=935, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 11:47:51,705 INFO L87 Difference]: Start difference. First operand 571 states and 742 transitions. Second operand 35 states. [2020-07-21 11:47:54,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:54,938 INFO L93 Difference]: Finished difference Result 742 states and 973 transitions. [2020-07-21 11:47:54,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 11:47:54,939 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 884 [2020-07-21 11:47:54,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:54,943 INFO L225 Difference]: With dead ends: 742 [2020-07-21 11:47:54,943 INFO L226 Difference]: Without dead ends: 572 [2020-07-21 11:47:54,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1809 GetRequests, 1727 SyntacticMatches, 7 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1621, Invalid=4231, Unknown=0, NotChecked=0, Total=5852 [2020-07-21 11:47:54,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2020-07-21 11:47:55,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 540. [2020-07-21 11:47:55,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 540 states. [2020-07-21 11:47:55,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540 states to 540 states and 697 transitions. [2020-07-21 11:47:55,048 INFO L78 Accepts]: Start accepts. Automaton has 540 states and 697 transitions. Word has length 884 [2020-07-21 11:47:55,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:55,050 INFO L479 AbstractCegarLoop]: Abstraction has 540 states and 697 transitions. [2020-07-21 11:47:55,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 11:47:55,050 INFO L276 IsEmpty]: Start isEmpty. Operand 540 states and 697 transitions. [2020-07-21 11:47:55,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 892 [2020-07-21 11:47:55,074 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:55,074 INFO L422 BasicCegarLoop]: trace histogram [115, 115, 115, 114, 114, 114, 114, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:47:55,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:55,288 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:55,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:55,289 INFO L82 PathProgramCache]: Analyzing trace with hash 932118245, now seen corresponding path program 40 times [2020-07-21 11:47:55,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:55,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1308156711] [2020-07-21 11:47:55,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:55,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:55,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 1569 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 11:47:55,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:56,502 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:47:56,504 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:47:57,987 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 18003 proven. 126 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-21 11:47:57,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:58,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:48:00,865 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 7043 proven. 11086 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-21 11:48:00,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1308156711] [2020-07-21 11:48:00,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:48:00,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-21 11:48:00,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015883728] [2020-07-21 11:48:00,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 11:48:00,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:48:00,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 11:48:00,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=787, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 11:48:00,868 INFO L87 Difference]: Start difference. First operand 540 states and 697 transitions. Second operand 35 states. [2020-07-21 11:48:03,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:48:03,595 INFO L93 Difference]: Finished difference Result 695 states and 917 transitions. [2020-07-21 11:48:03,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-07-21 11:48:03,597 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 891 [2020-07-21 11:48:03,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:48:03,601 INFO L225 Difference]: With dead ends: 695 [2020-07-21 11:48:03,601 INFO L226 Difference]: Without dead ends: 693 [2020-07-21 11:48:03,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1821 GetRequests, 1741 SyntacticMatches, 7 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1731 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1898, Invalid=3652, Unknown=0, NotChecked=0, Total=5550 [2020-07-21 11:48:03,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2020-07-21 11:48:03,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 610. [2020-07-21 11:48:03,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 610 states. [2020-07-21 11:48:03,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 610 states to 610 states and 799 transitions. [2020-07-21 11:48:03,691 INFO L78 Accepts]: Start accepts. Automaton has 610 states and 799 transitions. Word has length 891 [2020-07-21 11:48:03,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:48:03,693 INFO L479 AbstractCegarLoop]: Abstraction has 610 states and 799 transitions. [2020-07-21 11:48:03,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 11:48:03,693 INFO L276 IsEmpty]: Start isEmpty. Operand 610 states and 799 transitions. [2020-07-21 11:48:03,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 934 [2020-07-21 11:48:03,702 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:48:03,702 INFO L422 BasicCegarLoop]: trace histogram [121, 121, 121, 120, 120, 120, 120, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:48:03,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:03,917 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:48:03,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:48:03,918 INFO L82 PathProgramCache]: Analyzing trace with hash -1311394747, now seen corresponding path program 41 times [2020-07-21 11:48:03,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:48:03,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [645355042] [2020-07-21 11:48:03,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:04,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:48:04,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 1641 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 11:48:04,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:48:05,490 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 4615 proven. 19121 refuted. 0 times theorem prover too weak. 29726 trivial. 0 not checked. [2020-07-21 11:48:05,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:48:07,372 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 2325 proven. 19121 refuted. 0 times theorem prover too weak. 32016 trivial. 0 not checked. [2020-07-21 11:48:07,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [645355042] [2020-07-21 11:48:07,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:48:07,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 41 [2020-07-21 11:48:07,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299482742] [2020-07-21 11:48:07,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-21 11:48:07,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:48:07,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-21 11:48:07,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=1324, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 11:48:07,374 INFO L87 Difference]: Start difference. First operand 610 states and 799 transitions. Second operand 41 states. [2020-07-21 11:48:22,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:48:22,999 INFO L93 Difference]: Finished difference Result 920 states and 1236 transitions. [2020-07-21 11:48:23,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 166 states. [2020-07-21 11:48:23,000 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 933 [2020-07-21 11:48:23,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:48:23,003 INFO L225 Difference]: With dead ends: 920 [2020-07-21 11:48:23,004 INFO L226 Difference]: Without dead ends: 697 [2020-07-21 11:48:23,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2024 GetRequests, 1819 SyntacticMatches, 7 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16140 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=8499, Invalid=31301, Unknown=0, NotChecked=0, Total=39800 [2020-07-21 11:48:23,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2020-07-21 11:48:23,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 643. [2020-07-21 11:48:23,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 643 states. [2020-07-21 11:48:23,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 843 transitions. [2020-07-21 11:48:23,098 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 843 transitions. Word has length 933 [2020-07-21 11:48:23,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:48:23,099 INFO L479 AbstractCegarLoop]: Abstraction has 643 states and 843 transitions. [2020-07-21 11:48:23,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-21 11:48:23,099 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 843 transitions. [2020-07-21 11:48:23,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1000 [2020-07-21 11:48:23,110 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:48:23,110 INFO L422 BasicCegarLoop]: trace histogram [130, 130, 130, 129, 129, 129, 129, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:48:23,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:23,324 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:48:23,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:48:23,325 INFO L82 PathProgramCache]: Analyzing trace with hash -874980193, now seen corresponding path program 42 times [2020-07-21 11:48:23,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:48:23,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827048418] [2020-07-21 11:48:23,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:23,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:48:23,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 1755 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 11:48:23,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:48:24,945 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 28448 proven. 3247 refuted. 0 times theorem prover too weak. 29980 trivial. 0 not checked. [2020-07-21 11:48:24,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:48:27,090 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 13913 proven. 10972 refuted. 0 times theorem prover too weak. 36790 trivial. 0 not checked. [2020-07-21 11:48:27,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [827048418] [2020-07-21 11:48:27,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:48:27,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 39 [2020-07-21 11:48:27,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652130535] [2020-07-21 11:48:27,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-21 11:48:27,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:48:27,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-21 11:48:27,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1171, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 11:48:27,092 INFO L87 Difference]: Start difference. First operand 643 states and 843 transitions. Second operand 39 states. [2020-07-21 11:48:31,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:48:31,595 INFO L93 Difference]: Finished difference Result 912 states and 1233 transitions. [2020-07-21 11:48:31,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2020-07-21 11:48:31,623 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 999 [2020-07-21 11:48:31,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:48:31,626 INFO L225 Difference]: With dead ends: 912 [2020-07-21 11:48:31,626 INFO L226 Difference]: Without dead ends: 715 [2020-07-21 11:48:31,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2049 GetRequests, 1953 SyntacticMatches, 7 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1842 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2273, Invalid=5917, Unknown=0, NotChecked=0, Total=8190 [2020-07-21 11:48:31,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 715 states. [2020-07-21 11:48:31,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 715 to 695. [2020-07-21 11:48:31,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 695 states. [2020-07-21 11:48:31,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 919 transitions. [2020-07-21 11:48:31,730 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 919 transitions. Word has length 999 [2020-07-21 11:48:31,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:48:31,730 INFO L479 AbstractCegarLoop]: Abstraction has 695 states and 919 transitions. [2020-07-21 11:48:31,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-21 11:48:31,731 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 919 transitions. [2020-07-21 11:48:31,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1007 [2020-07-21 11:48:31,737 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:48:31,738 INFO L422 BasicCegarLoop]: trace histogram [131, 131, 131, 130, 130, 130, 130, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:48:31,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:31,944 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:48:31,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:48:31,945 INFO L82 PathProgramCache]: Analyzing trace with hash -1744475458, now seen corresponding path program 43 times [2020-07-21 11:48:31,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:48:31,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1312829345] [2020-07-21 11:48:31,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:32,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:48:32,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 1767 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 11:48:32,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:48:33,859 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 4166 proven. 23316 refuted. 0 times theorem prover too weak. 35120 trivial. 0 not checked. [2020-07-21 11:48:33,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:48:36,485 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 2158 proven. 23316 refuted. 0 times theorem prover too weak. 37128 trivial. 0 not checked. [2020-07-21 11:48:36,485 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1312829345] [2020-07-21 11:48:36,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:48:36,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 45 [2020-07-21 11:48:36,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331857962] [2020-07-21 11:48:36,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-07-21 11:48:36,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:48:36,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-07-21 11:48:36,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=375, Invalid=1605, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 11:48:36,487 INFO L87 Difference]: Start difference. First operand 695 states and 919 transitions. Second operand 45 states. [2020-07-21 11:48:57,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:48:57,880 INFO L93 Difference]: Finished difference Result 1187 states and 1603 transitions. [2020-07-21 11:48:57,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 185 states. [2020-07-21 11:48:57,883 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 1006 [2020-07-21 11:48:57,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:48:57,889 INFO L225 Difference]: With dead ends: 1187 [2020-07-21 11:48:57,889 INFO L226 Difference]: Without dead ends: 873 [2020-07-21 11:48:57,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2190 GetRequests, 1961 SyntacticMatches, 7 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20395 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=11282, Invalid=38670, Unknown=0, NotChecked=0, Total=49952 [2020-07-21 11:48:57,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 873 states. [2020-07-21 11:48:58,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 873 to 733. [2020-07-21 11:48:58,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 733 states. [2020-07-21 11:48:58,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 733 states to 733 states and 971 transitions. [2020-07-21 11:48:58,026 INFO L78 Accepts]: Start accepts. Automaton has 733 states and 971 transitions. Word has length 1006 [2020-07-21 11:48:58,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:48:58,027 INFO L479 AbstractCegarLoop]: Abstraction has 733 states and 971 transitions. [2020-07-21 11:48:58,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-07-21 11:48:58,027 INFO L276 IsEmpty]: Start isEmpty. Operand 733 states and 971 transitions. [2020-07-21 11:48:58,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1083 [2020-07-21 11:48:58,038 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:48:58,038 INFO L422 BasicCegarLoop]: trace histogram [141, 141, 141, 140, 140, 140, 140, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:48:58,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:58,239 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:48:58,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:48:58,240 INFO L82 PathProgramCache]: Analyzing trace with hash 2076739844, now seen corresponding path program 44 times [2020-07-21 11:48:58,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:48:58,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1656050366] [2020-07-21 11:48:58,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:58,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:48:58,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 1899 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 11:48:58,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:49:00,394 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 33214 proven. 3930 refuted. 0 times theorem prover too weak. 35362 trivial. 0 not checked. [2020-07-21 11:49:00,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:49:03,396 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 15493 proven. 14181 refuted. 0 times theorem prover too weak. 42832 trivial. 0 not checked. [2020-07-21 11:49:03,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1656050366] [2020-07-21 11:49:03,396 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:49:03,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 43 [2020-07-21 11:49:03,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958242372] [2020-07-21 11:49:03,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-21 11:49:03,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:49:03,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-21 11:49:03,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=373, Invalid=1433, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 11:49:03,398 INFO L87 Difference]: Start difference. First operand 733 states and 971 transitions. Second operand 43 states. [2020-07-21 11:49:10,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:49:10,200 INFO L93 Difference]: Finished difference Result 1089 states and 1483 transitions. [2020-07-21 11:49:10,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2020-07-21 11:49:10,202 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 1082 [2020-07-21 11:49:10,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:49:10,207 INFO L225 Difference]: With dead ends: 1089 [2020-07-21 11:49:10,207 INFO L226 Difference]: Without dead ends: 804 [2020-07-21 11:49:10,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2226 GetRequests, 2115 SyntacticMatches, 7 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2563 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=3117, Invalid=8013, Unknown=0, NotChecked=0, Total=11130 [2020-07-21 11:49:10,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 804 states. [2020-07-21 11:49:10,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 804 to 785. [2020-07-21 11:49:10,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 785 states. [2020-07-21 11:49:10,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 1046 transitions. [2020-07-21 11:49:10,330 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 1046 transitions. Word has length 1082 [2020-07-21 11:49:10,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:49:10,331 INFO L479 AbstractCegarLoop]: Abstraction has 785 states and 1046 transitions. [2020-07-21 11:49:10,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-21 11:49:10,331 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 1046 transitions. [2020-07-21 11:49:10,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1090 [2020-07-21 11:49:10,364 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:49:10,364 INFO L422 BasicCegarLoop]: trace histogram [142, 142, 142, 141, 141, 141, 141, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:49:10,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:10,576 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:49:10,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:49:10,577 INFO L82 PathProgramCache]: Analyzing trace with hash -690954159, now seen corresponding path program 45 times [2020-07-21 11:49:10,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:49:10,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437961637] [2020-07-21 11:49:10,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:10,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:49:10,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 1911 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 11:49:10,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:49:11,976 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 8093 proven. 22813 refuted. 0 times theorem prover too weak. 42605 trivial. 0 not checked. [2020-07-21 11:49:11,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:49:14,382 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 3853 proven. 22813 refuted. 0 times theorem prover too weak. 46845 trivial. 0 not checked. [2020-07-21 11:49:14,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437961637] [2020-07-21 11:49:14,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:49:14,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 28 [2020-07-21 11:49:14,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839963764] [2020-07-21 11:49:14,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 11:49:14,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:49:14,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 11:49:14,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=581, Unknown=0, NotChecked=0, Total=756 [2020-07-21 11:49:14,385 INFO L87 Difference]: Start difference. First operand 785 states and 1046 transitions. Second operand 28 states. [2020-07-21 11:49:22,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:49:22,765 INFO L93 Difference]: Finished difference Result 1700 states and 2319 transitions. [2020-07-21 11:49:22,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-21 11:49:22,769 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 1089 [2020-07-21 11:49:22,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:49:22,776 INFO L225 Difference]: With dead ends: 1700 [2020-07-21 11:49:22,776 INFO L226 Difference]: Without dead ends: 1392 [2020-07-21 11:49:22,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2270 GetRequests, 2143 SyntacticMatches, 8 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5615 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=3057, Invalid=11463, Unknown=0, NotChecked=0, Total=14520 [2020-07-21 11:49:22,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1392 states. [2020-07-21 11:49:22,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1392 to 984. [2020-07-21 11:49:22,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 984 states. [2020-07-21 11:49:22,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 984 states to 984 states and 1306 transitions. [2020-07-21 11:49:22,959 INFO L78 Accepts]: Start accepts. Automaton has 984 states and 1306 transitions. Word has length 1089 [2020-07-21 11:49:22,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:49:22,960 INFO L479 AbstractCegarLoop]: Abstraction has 984 states and 1306 transitions. [2020-07-21 11:49:22,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 11:49:22,960 INFO L276 IsEmpty]: Start isEmpty. Operand 984 states and 1306 transitions. [2020-07-21 11:49:22,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-21 11:49:22,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:49:22,971 INFO L422 BasicCegarLoop]: trace histogram [148, 148, 148, 147, 147, 147, 147, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:49:23,172 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:23,172 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:49:23,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:49:23,173 INFO L82 PathProgramCache]: Analyzing trace with hash -944230286, now seen corresponding path program 46 times [2020-07-21 11:49:23,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:49:23,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045804090] [2020-07-21 11:49:23,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:23,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:49:23,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 1989 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 11:49:23,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:49:24,591 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 34663 proven. 2592 refuted. 0 times theorem prover too weak. 42652 trivial. 0 not checked. [2020-07-21 11:49:24,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:49:27,365 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 26745 proven. 2620 refuted. 0 times theorem prover too weak. 50542 trivial. 0 not checked. [2020-07-21 11:49:27,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045804090] [2020-07-21 11:49:27,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:49:27,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-21 11:49:27,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123891402] [2020-07-21 11:49:27,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 11:49:27,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:49:27,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 11:49:27,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=494, Unknown=0, NotChecked=0, Total=650 [2020-07-21 11:49:27,368 INFO L87 Difference]: Start difference. First operand 984 states and 1306 transitions. Second operand 26 states. [2020-07-21 11:49:29,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:49:29,537 INFO L93 Difference]: Finished difference Result 1307 states and 1766 transitions. [2020-07-21 11:49:29,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 11:49:29,540 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 1134 [2020-07-21 11:49:29,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:49:29,544 INFO L225 Difference]: With dead ends: 1307 [2020-07-21 11:49:29,544 INFO L226 Difference]: Without dead ends: 810 [2020-07-21 11:49:29,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2284 GetRequests, 2235 SyntacticMatches, 8 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=502, Invalid=1304, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 11:49:29,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 810 states. [2020-07-21 11:49:29,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 810 to 810. [2020-07-21 11:49:29,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 810 states. [2020-07-21 11:49:29,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 810 states to 810 states and 1076 transitions. [2020-07-21 11:49:29,681 INFO L78 Accepts]: Start accepts. Automaton has 810 states and 1076 transitions. Word has length 1134 [2020-07-21 11:49:29,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:49:29,683 INFO L479 AbstractCegarLoop]: Abstraction has 810 states and 1076 transitions. [2020-07-21 11:49:29,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 11:49:29,683 INFO L276 IsEmpty]: Start isEmpty. Operand 810 states and 1076 transitions. [2020-07-21 11:49:29,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1142 [2020-07-21 11:49:29,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:49:29,697 INFO L422 BasicCegarLoop]: trace histogram [149, 149, 149, 148, 148, 148, 148, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:49:29,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:29,911 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:49:29,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:49:29,912 INFO L82 PathProgramCache]: Analyzing trace with hash -211111029, now seen corresponding path program 47 times [2020-07-21 11:49:29,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:49:29,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [218576680] [2020-07-21 11:49:29,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:30,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:49:30,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 2001 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 11:49:30,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:49:31,679 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 7585 proven. 26386 refuted. 0 times theorem prover too weak. 46991 trivial. 0 not checked. [2020-07-21 11:49:31,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:49:34,565 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 3651 proven. 26386 refuted. 0 times theorem prover too weak. 50925 trivial. 0 not checked. [2020-07-21 11:49:34,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [218576680] [2020-07-21 11:49:34,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:49:34,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 32 [2020-07-21 11:49:34,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381354025] [2020-07-21 11:49:34,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 11:49:34,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:49:34,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 11:49:34,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=779, Unknown=0, NotChecked=0, Total=992 [2020-07-21 11:49:34,568 INFO L87 Difference]: Start difference. First operand 810 states and 1076 transitions. Second operand 32 states. [2020-07-21 11:49:51,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:49:51,563 INFO L93 Difference]: Finished difference Result 1339 states and 1834 transitions. [2020-07-21 11:49:51,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2020-07-21 11:49:51,566 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 1141 [2020-07-21 11:49:51,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:49:51,572 INFO L225 Difference]: With dead ends: 1339 [2020-07-21 11:49:51,572 INFO L226 Difference]: Without dead ends: 1021 [2020-07-21 11:49:51,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2427 GetRequests, 2243 SyntacticMatches, 8 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13489 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=6498, Invalid=25008, Unknown=0, NotChecked=0, Total=31506 [2020-07-21 11:49:51,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1021 states. [2020-07-21 11:49:51,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1021 to 837. [2020-07-21 11:49:51,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-21 11:49:51,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1112 transitions. [2020-07-21 11:49:51,719 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1112 transitions. Word has length 1141 [2020-07-21 11:49:51,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:49:51,719 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1112 transitions. [2020-07-21 11:49:51,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 11:49:51,720 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1112 transitions. [2020-07-21 11:49:51,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1194 [2020-07-21 11:49:51,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:49:51,730 INFO L422 BasicCegarLoop]: trace histogram [156, 156, 156, 155, 155, 155, 155, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:49:51,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:51,944 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:49:51,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:49:51,945 INFO L82 PathProgramCache]: Analyzing trace with hash -2061681211, now seen corresponding path program 48 times [2020-07-21 11:49:51,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:49:51,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1338405516] [2020-07-21 11:49:51,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:52,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:49:52,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 2091 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 11:49:52,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:49:53,671 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 38543 proven. 3172 refuted. 0 times theorem prover too weak. 47058 trivial. 0 not checked. [2020-07-21 11:49:53,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:49:56,795 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 27156 proven. 6189 refuted. 0 times theorem prover too weak. 55428 trivial. 0 not checked. [2020-07-21 11:49:56,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1338405516] [2020-07-21 11:49:56,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:49:56,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 30 [2020-07-21 11:49:56,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817010151] [2020-07-21 11:49:56,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 11:49:56,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:49:56,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 11:49:56,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=672, Unknown=0, NotChecked=0, Total=870 [2020-07-21 11:49:56,797 INFO L87 Difference]: Start difference. First operand 837 states and 1112 transitions. Second operand 30 states. [2020-07-21 11:50:00,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:50:00,200 INFO L93 Difference]: Finished difference Result 1138 states and 1543 transitions. [2020-07-21 11:50:00,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-21 11:50:00,204 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 1193 [2020-07-21 11:50:00,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:50:00,210 INFO L225 Difference]: With dead ends: 1138 [2020-07-21 11:50:00,210 INFO L226 Difference]: Without dead ends: 837 [2020-07-21 11:50:00,211 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2413 GetRequests, 2349 SyntacticMatches, 8 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 645 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=911, Invalid=2395, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 11:50:00,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 837 states. [2020-07-21 11:50:00,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 837 to 837. [2020-07-21 11:50:00,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-21 11:50:00,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1110 transitions. [2020-07-21 11:50:00,343 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1110 transitions. Word has length 1193 [2020-07-21 11:50:00,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:50:00,344 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1110 transitions. [2020-07-21 11:50:00,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 11:50:00,344 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1110 transitions. [2020-07-21 11:50:00,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1201 [2020-07-21 11:50:00,355 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:50:00,356 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 157, 156, 156, 156, 156, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:50:00,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:00,557 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:50:00,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:50:00,558 INFO L82 PathProgramCache]: Analyzing trace with hash 1739494104, now seen corresponding path program 49 times [2020-07-21 11:50:00,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:50:00,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1138878193] [2020-07-21 11:50:00,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:00,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:50:00,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 2103 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 11:50:00,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:50:02,557 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 7011 proven. 30616 refuted. 0 times theorem prover too weak. 52258 trivial. 0 not checked. [2020-07-21 11:50:02,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:50:05,990 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 3423 proven. 30616 refuted. 0 times theorem prover too weak. 55846 trivial. 0 not checked. [2020-07-21 11:50:05,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1138878193] [2020-07-21 11:50:05,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:50:05,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 36 [2020-07-21 11:50:05,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239295394] [2020-07-21 11:50:05,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 11:50:05,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:50:05,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 11:50:05,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1003, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 11:50:05,992 INFO L87 Difference]: Start difference. First operand 837 states and 1110 transitions. Second operand 36 states. [2020-07-21 11:50:32,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:50:32,833 INFO L93 Difference]: Finished difference Result 1323 states and 1801 transitions. [2020-07-21 11:50:32,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 190 states. [2020-07-21 11:50:32,836 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 1200 [2020-07-21 11:50:32,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:50:32,842 INFO L225 Difference]: With dead ends: 1323 [2020-07-21 11:50:32,842 INFO L226 Difference]: Without dead ends: 1002 [2020-07-21 11:50:32,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2581 GetRequests, 2357 SyntacticMatches, 8 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20752 ImplicationChecksByTransitivity, 21.4s TimeCoverageRelationStatistics Valid=9652, Invalid=37654, Unknown=0, NotChecked=0, Total=47306 [2020-07-21 11:50:32,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1002 states. [2020-07-21 11:50:32,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1002 to 867. [2020-07-21 11:50:32,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-21 11:50:32,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1150 transitions. [2020-07-21 11:50:32,990 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1150 transitions. Word has length 1200 [2020-07-21 11:50:32,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:50:32,991 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1150 transitions. [2020-07-21 11:50:32,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 11:50:32,991 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1150 transitions. [2020-07-21 11:50:33,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1260 [2020-07-21 11:50:33,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:50:33,003 INFO L422 BasicCegarLoop]: trace histogram [165, 165, 165, 164, 164, 164, 164, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:50:33,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:33,203 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:50:33,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:50:33,204 INFO L82 PathProgramCache]: Analyzing trace with hash -891846805, now seen corresponding path program 50 times [2020-07-21 11:50:33,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:50:33,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2056163405] [2020-07-21 11:50:33,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:33,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:50:33,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 2205 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 11:50:33,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:50:35,284 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 43117 proven. 3824 refuted. 0 times theorem prover too weak. 52334 trivial. 0 not checked. [2020-07-21 11:50:35,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:50:39,267 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 27802 proven. 10229 refuted. 0 times theorem prover too weak. 61244 trivial. 0 not checked. [2020-07-21 11:50:39,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2056163405] [2020-07-21 11:50:39,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:50:39,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 34 [2020-07-21 11:50:39,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015362781] [2020-07-21 11:50:39,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 11:50:39,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:50:39,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 11:50:39,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=876, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 11:50:39,270 INFO L87 Difference]: Start difference. First operand 867 states and 1150 transitions. Second operand 34 states. [2020-07-21 11:50:43,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:50:43,763 INFO L93 Difference]: Finished difference Result 1168 states and 1580 transitions. [2020-07-21 11:50:43,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 11:50:43,767 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 1259 [2020-07-21 11:50:43,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:50:43,773 INFO L225 Difference]: With dead ends: 1168 [2020-07-21 11:50:43,774 INFO L226 Difference]: Without dead ends: 867 [2020-07-21 11:50:43,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2555 GetRequests, 2477 SyntacticMatches, 8 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1073 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1406, Invalid=3706, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 11:50:43,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2020-07-21 11:50:43,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 867. [2020-07-21 11:50:43,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-21 11:50:43,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1148 transitions. [2020-07-21 11:50:43,928 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1148 transitions. Word has length 1259 [2020-07-21 11:50:43,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:50:43,929 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1148 transitions. [2020-07-21 11:50:43,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 11:50:43,930 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1148 transitions. [2020-07-21 11:50:43,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1267 [2020-07-21 11:50:43,940 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:50:43,941 INFO L422 BasicCegarLoop]: trace histogram [166, 166, 166, 165, 165, 165, 165, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:50:44,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:44,142 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:50:44,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:50:44,143 INFO L82 PathProgramCache]: Analyzing trace with hash -1524872590, now seen corresponding path program 51 times [2020-07-21 11:50:44,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:50:44,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [327938708] [2020-07-21 11:50:44,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:44,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:50:44,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 2217 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 11:50:44,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:50:46,740 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 6350 proven. 35584 refuted. 0 times theorem prover too weak. 58517 trivial. 0 not checked. [2020-07-21 11:50:46,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:50:50,980 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 3160 proven. 35584 refuted. 0 times theorem prover too weak. 61707 trivial. 0 not checked. [2020-07-21 11:50:50,980 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [327938708] [2020-07-21 11:50:50,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:50:50,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 40 [2020-07-21 11:50:50,981 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175083346] [2020-07-21 11:50:50,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 11:50:50,982 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:50:50,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 11:50:50,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=1253, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 11:50:50,983 INFO L87 Difference]: Start difference. First operand 867 states and 1148 transitions. Second operand 40 states. [2020-07-21 11:51:30,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:51:30,924 INFO L93 Difference]: Finished difference Result 1310 states and 1773 transitions. [2020-07-21 11:51:30,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 215 states. [2020-07-21 11:51:30,928 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 1266 [2020-07-21 11:51:30,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:51:30,934 INFO L225 Difference]: With dead ends: 1310 [2020-07-21 11:51:30,934 INFO L226 Difference]: Without dead ends: 986 [2020-07-21 11:51:30,940 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2738 GetRequests, 2485 SyntacticMatches, 8 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26619 ImplicationChecksByTransitivity, 31.9s TimeCoverageRelationStatistics Valid=12065, Invalid=48697, Unknown=0, NotChecked=0, Total=60762 [2020-07-21 11:51:30,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 986 states. [2020-07-21 11:51:31,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 986 to 900. [2020-07-21 11:51:31,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-21 11:51:31,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1192 transitions. [2020-07-21 11:51:31,157 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1192 transitions. Word has length 1266 [2020-07-21 11:51:31,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:51:31,158 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1192 transitions. [2020-07-21 11:51:31,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 11:51:31,158 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1192 transitions. [2020-07-21 11:51:31,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1333 [2020-07-21 11:51:31,173 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:51:31,174 INFO L422 BasicCegarLoop]: trace histogram [175, 175, 175, 174, 174, 174, 174, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:51:31,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:31,375 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:51:31,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:51:31,376 INFO L82 PathProgramCache]: Analyzing trace with hash -719015028, now seen corresponding path program 52 times [2020-07-21 11:51:31,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:51:31,376 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903258750] [2020-07-21 11:51:31,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:31,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:51:31,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 2331 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 11:51:31,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:51:33,881 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 48457 proven. 4557 refuted. 0 times theorem prover too weak. 58591 trivial. 0 not checked. [2020-07-21 11:51:33,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:51:38,679 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 28755 proven. 14749 refuted. 0 times theorem prover too weak. 68101 trivial. 0 not checked. [2020-07-21 11:51:38,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903258750] [2020-07-21 11:51:38,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:51:38,680 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 38 [2020-07-21 11:51:38,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781899783] [2020-07-21 11:51:38,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 11:51:38,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:51:38,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 11:51:38,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=1106, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 11:51:38,682 INFO L87 Difference]: Start difference. First operand 900 states and 1192 transitions. Second operand 38 states. [2020-07-21 11:51:46,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:51:46,688 INFO L93 Difference]: Finished difference Result 1201 states and 1621 transitions. [2020-07-21 11:51:46,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-21 11:51:46,692 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 1332 [2020-07-21 11:51:46,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:51:46,699 INFO L225 Difference]: With dead ends: 1201 [2020-07-21 11:51:46,699 INFO L226 Difference]: Without dead ends: 900 [2020-07-21 11:51:46,701 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2711 GetRequests, 2619 SyntacticMatches, 8 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1604 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=2005, Invalid=5305, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 11:51:46,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2020-07-21 11:51:46,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 900. [2020-07-21 11:51:46,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-21 11:51:46,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1190 transitions. [2020-07-21 11:51:46,856 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1190 transitions. Word has length 1332 [2020-07-21 11:51:46,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:51:46,856 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1190 transitions. [2020-07-21 11:51:46,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 11:51:46,857 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1190 transitions. [2020-07-21 11:51:46,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1340 [2020-07-21 11:51:46,869 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:51:46,869 INFO L422 BasicCegarLoop]: trace histogram [176, 176, 176, 175, 175, 175, 175, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:51:47,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:47,070 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:51:47,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:51:47,072 INFO L82 PathProgramCache]: Analyzing trace with hash -78422223, now seen corresponding path program 53 times [2020-07-21 11:51:47,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:51:47,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1907620603] [2020-07-21 11:51:47,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:47,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:51:47,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 2343 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 11:51:47,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:51:49,933 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 5581 proven. 41380 refuted. 0 times theorem prover too weak. 65891 trivial. 0 not checked. [2020-07-21 11:51:49,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:51:55,509 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 2853 proven. 41380 refuted. 0 times theorem prover too weak. 68619 trivial. 0 not checked. [2020-07-21 11:51:55,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1907620603] [2020-07-21 11:51:55,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:51:55,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 44 [2020-07-21 11:51:55,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770078129] [2020-07-21 11:51:55,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 11:51:55,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:51:55,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 11:51:55,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1529, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 11:51:55,515 INFO L87 Difference]: Start difference. First operand 900 states and 1190 transitions. Second operand 44 states. [2020-07-21 11:52:46,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:52:46,268 INFO L93 Difference]: Finished difference Result 1317 states and 1778 transitions. [2020-07-21 11:52:46,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2020-07-21 11:52:46,273 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 1339 [2020-07-21 11:52:46,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:52:46,280 INFO L225 Difference]: With dead ends: 1317 [2020-07-21 11:52:46,280 INFO L226 Difference]: Without dead ends: 990 [2020-07-21 11:52:46,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2904 GetRequests, 2627 SyntacticMatches, 8 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32405 ImplicationChecksByTransitivity, 41.0s TimeCoverageRelationStatistics Valid=14907, Invalid=58263, Unknown=0, NotChecked=0, Total=73170 [2020-07-21 11:52:46,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 990 states. [2020-07-21 11:52:46,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 990 to 936. [2020-07-21 11:52:46,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 936 states. [2020-07-21 11:52:46,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 936 states to 936 states and 1238 transitions. [2020-07-21 11:52:46,446 INFO L78 Accepts]: Start accepts. Automaton has 936 states and 1238 transitions. Word has length 1339 [2020-07-21 11:52:46,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:52:46,446 INFO L479 AbstractCegarLoop]: Abstraction has 936 states and 1238 transitions. [2020-07-21 11:52:46,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 11:52:46,446 INFO L276 IsEmpty]: Start isEmpty. Operand 936 states and 1238 transitions. [2020-07-21 11:52:46,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1413 [2020-07-21 11:52:46,460 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:52:46,460 INFO L422 BasicCegarLoop]: trace histogram [186, 186, 186, 185, 185, 185, 185, 27, 26, 26, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:52:46,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:52:46,661 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:52:46,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:52:46,662 INFO L82 PathProgramCache]: Analyzing trace with hash 2025630034, now seen corresponding path program 54 times [2020-07-21 11:52:46,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:52:46,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1369750931] [2020-07-21 11:52:46,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:52:47,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:52:47,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 2469 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 11:52:47,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:52:49,819 INFO L134 CoverageAnalysis]: Checked inductivity of 125976 backedges. 54644 proven. 5380 refuted. 0 times theorem prover too weak. 65952 trivial. 0 not checked. [2020-07-21 11:52:49,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:52:56,476 INFO L134 CoverageAnalysis]: Checked inductivity of 125976 backedges. 30096 proven. 19758 refuted. 0 times theorem prover too weak. 76122 trivial. 0 not checked. [2020-07-21 11:52:56,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1369750931] [2020-07-21 11:52:56,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:52:56,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 42 [2020-07-21 11:52:56,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802613368] [2020-07-21 11:52:56,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-21 11:52:56,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:52:56,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-21 11:52:56,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=1362, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 11:52:56,479 INFO L87 Difference]: Start difference. First operand 936 states and 1238 transitions. Second operand 42 states. [2020-07-21 11:53:06,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:53:06,917 INFO L93 Difference]: Finished difference Result 1237 states and 1666 transitions. [2020-07-21 11:53:06,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-21 11:53:06,921 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 1412 [2020-07-21 11:53:06,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:53:06,928 INFO L225 Difference]: With dead ends: 1237 [2020-07-21 11:53:06,928 INFO L226 Difference]: Without dead ends: 936 [2020-07-21 11:53:06,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2882 GetRequests, 2775 SyntacticMatches, 8 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2295 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=2790, Invalid=7310, Unknown=0, NotChecked=0, Total=10100 [2020-07-21 11:53:06,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 936 states. [2020-07-21 11:53:07,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 936 to 887. [2020-07-21 11:53:07,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 887 states. [2020-07-21 11:53:07,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 887 states to 887 states and 1165 transitions. [2020-07-21 11:53:07,092 INFO L78 Accepts]: Start accepts. Automaton has 887 states and 1165 transitions. Word has length 1412 [2020-07-21 11:53:07,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:53:07,093 INFO L479 AbstractCegarLoop]: Abstraction has 887 states and 1165 transitions. [2020-07-21 11:53:07,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-21 11:53:07,093 INFO L276 IsEmpty]: Start isEmpty. Operand 887 states and 1165 transitions. [2020-07-21 11:53:07,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1420 [2020-07-21 11:53:07,106 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:53:07,107 INFO L422 BasicCegarLoop]: trace histogram [187, 187, 187, 186, 186, 186, 186, 27, 26, 26, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:53:07,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:53:07,308 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:53:07,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:53:07,309 INFO L82 PathProgramCache]: Analyzing trace with hash 1207336619, now seen corresponding path program 55 times [2020-07-21 11:53:07,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:53:07,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2054604419] [2020-07-21 11:53:07,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:53:07,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:53:07,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 2481 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 11:53:07,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:53:10,931 INFO L134 CoverageAnalysis]: Checked inductivity of 127301 backedges. 4683 proven. 48103 refuted. 0 times theorem prover too weak. 74515 trivial. 0 not checked. [2020-07-21 11:53:10,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:53:17,870 INFO L134 CoverageAnalysis]: Checked inductivity of 127301 backedges. 2493 proven. 48103 refuted. 0 times theorem prover too weak. 76705 trivial. 0 not checked. [2020-07-21 11:53:17,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2054604419] [2020-07-21 11:53:17,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:53:17,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 48 [2020-07-21 11:53:17,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749135497] [2020-07-21 11:53:17,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 11:53:17,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:53:17,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 11:53:17,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=1831, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 11:53:17,873 INFO L87 Difference]: Start difference. First operand 887 states and 1165 transitions. Second operand 48 states. [2020-07-21 11:53:18,761 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 11:53:19,521 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 11:53:20,017 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 11:53:20,255 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:53:25,033 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 11:53:25,309 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 11:53:28,158 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:53:28,477 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:53:41,830 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:53:46,250 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 22 [2020-07-21 11:53:47,153 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 11:53:50,901 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:53:51,228 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 11:53:52,104 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:53:52,509 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:53:52,909 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 11:53:53,307 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:53:53,679 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:54:19,086 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 11:54:20,167 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 11:54:20,776 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 11:54:21,148 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 11:54:21,414 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 11:54:25,668 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 11:54:26,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:54:26,652 INFO L93 Difference]: Finished difference Result 1261 states and 1689 transitions. [2020-07-21 11:54:26,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 248 states. [2020-07-21 11:54:26,658 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 1419 [2020-07-21 11:54:26,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:54:26,662 INFO L225 Difference]: With dead ends: 1261 [2020-07-21 11:54:26,663 INFO L226 Difference]: Without dead ends: 980 [2020-07-21 11:54:26,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3078 GetRequests, 2783 SyntacticMatches, 8 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36629 ImplicationChecksByTransitivity, 55.0s TimeCoverageRelationStatistics Valid=16884, Invalid=66348, Unknown=0, NotChecked=0, Total=83232 [2020-07-21 11:54:26,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 980 states. [2020-07-21 11:54:26,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 980 to 926. [2020-07-21 11:54:26,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 926 states. [2020-07-21 11:54:26,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 926 states to 926 states and 1217 transitions. [2020-07-21 11:54:26,918 INFO L78 Accepts]: Start accepts. Automaton has 926 states and 1217 transitions. Word has length 1419 [2020-07-21 11:54:26,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:54:26,919 INFO L479 AbstractCegarLoop]: Abstraction has 926 states and 1217 transitions. [2020-07-21 11:54:26,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 11:54:26,919 INFO L276 IsEmpty]: Start isEmpty. Operand 926 states and 1217 transitions. [2020-07-21 11:54:26,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1500 [2020-07-21 11:54:26,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:54:26,935 INFO L422 BasicCegarLoop]: trace histogram [198, 198, 198, 197, 197, 197, 197, 28, 27, 27, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:54:27,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:54:27,135 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:54:27,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:54:27,137 INFO L82 PathProgramCache]: Analyzing trace with hash 30841381, now seen corresponding path program 56 times [2020-07-21 11:54:27,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:54:27,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1282219819] [2020-07-21 11:54:27,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:54:27,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:54:27,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 2619 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 11:54:27,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:54:31,208 INFO L134 CoverageAnalysis]: Checked inductivity of 142622 backedges. 61768 proven. 6302 refuted. 0 times theorem prover too weak. 74552 trivial. 0 not checked. [2020-07-21 11:54:31,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:54:39,577 INFO L134 CoverageAnalysis]: Checked inductivity of 142622 backedges. 31915 proven. 25265 refuted. 0 times theorem prover too weak. 85442 trivial. 0 not checked. [2020-07-21 11:54:39,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1282219819] [2020-07-21 11:54:39,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:54:39,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 46 [2020-07-21 11:54:39,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248677028] [2020-07-21 11:54:39,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-21 11:54:39,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:54:39,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-21 11:54:39,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=1644, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 11:54:39,580 INFO L87 Difference]: Start difference. First operand 926 states and 1217 transitions. Second operand 46 states. [2020-07-21 11:54:55,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:54:55,010 INFO L93 Difference]: Finished difference Result 1244 states and 1672 transitions. [2020-07-21 11:54:55,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-21 11:54:55,016 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 1499 [2020-07-21 11:54:55,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:54:55,020 INFO L225 Difference]: With dead ends: 1244 [2020-07-21 11:54:55,020 INFO L226 Difference]: Without dead ends: 992 [2020-07-21 11:54:55,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3068 GetRequests, 2945 SyntacticMatches, 8 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3199 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=3768, Invalid=9804, Unknown=0, NotChecked=0, Total=13572 [2020-07-21 11:54:55,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 992 states. [2020-07-21 11:54:55,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 992 to 978. [2020-07-21 11:54:55,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 978 states. [2020-07-21 11:54:55,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 978 states to 978 states and 1291 transitions. [2020-07-21 11:54:55,236 INFO L78 Accepts]: Start accepts. Automaton has 978 states and 1291 transitions. Word has length 1499 [2020-07-21 11:54:55,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:54:55,237 INFO L479 AbstractCegarLoop]: Abstraction has 978 states and 1291 transitions. [2020-07-21 11:54:55,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-21 11:54:55,237 INFO L276 IsEmpty]: Start isEmpty. Operand 978 states and 1291 transitions. [2020-07-21 11:54:55,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1507 [2020-07-21 11:54:55,252 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:54:55,253 INFO L422 BasicCegarLoop]: trace histogram [199, 199, 199, 198, 198, 198, 198, 28, 27, 27, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:54:55,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:54:55,454 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:54:55,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:54:55,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1184462216, now seen corresponding path program 57 times [2020-07-21 11:54:55,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:54:55,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950867331] [2020-07-21 11:54:55,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:54:55,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:54:55,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 2631 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 11:54:55,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:54:59,854 INFO L134 CoverageAnalysis]: Checked inductivity of 144032 backedges. 3635 proven. 55861 refuted. 0 times theorem prover too weak. 84536 trivial. 0 not checked. [2020-07-21 11:54:59,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:55:08,324 INFO L134 CoverageAnalysis]: Checked inductivity of 144032 backedges. 2071 proven. 55861 refuted. 0 times theorem prover too weak. 86100 trivial. 0 not checked. [2020-07-21 11:55:08,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950867331] [2020-07-21 11:55:08,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:55:08,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 52 [2020-07-21 11:55:08,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662769502] [2020-07-21 11:55:08,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-21 11:55:08,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:55:08,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-21 11:55:08,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=493, Invalid=2159, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 11:55:08,326 INFO L87 Difference]: Start difference. First operand 978 states and 1291 transitions. Second operand 52 states. [2020-07-21 11:55:09,604 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 11:55:09,977 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 11:55:10,716 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:10,978 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:55:11,759 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 11:55:12,074 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 11:55:12,456 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 11:55:12,712 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 11:55:12,935 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 11:55:13,725 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:55:14,044 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:55:14,324 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 11:55:14,622 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:55:14,873 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 11:55:15,121 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:55:17,066 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:17,458 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 11:55:18,394 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 11:55:18,782 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:19,141 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 11:55:19,444 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:20,120 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 11:55:20,411 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:55:20,778 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:21,115 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:55:21,421 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:21,698 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:55:21,945 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:55:22,197 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 11:55:22,492 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 11:55:22,845 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 11:55:23,226 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:24,526 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:24,840 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 11:55:25,101 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-21 11:55:25,460 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-21 11:55:26,185 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 11:55:26,475 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 11:55:27,336 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 11:55:27,665 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:28,011 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 11:55:28,309 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 11:55:28,584 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:55:28,840 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:55:29,082 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 11:55:29,437 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:55:30,411 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:55:30,707 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:55:30,987 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:31,235 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:55:31,499 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:55:31,805 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 11:55:32,589 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:55:33,357 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 11:55:34,313 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 11:55:34,636 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 11:55:34,911 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-21 11:55:35,303 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 11:55:35,777 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:55:36,188 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 11:55:36,599 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:37,358 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:37,700 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 11:55:38,030 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 20 [2020-07-21 11:55:38,303 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-21 11:55:38,587 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 11:55:38,880 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:39,237 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:40,418 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 11:55:40,673 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 11:55:40,921 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 11:55:41,187 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 11:55:41,480 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:55:41,838 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:55:42,194 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:42,512 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:42,816 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:43,090 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:55:43,350 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:43,621 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:55:43,866 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 11:55:44,619 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:55:45,024 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:55:45,427 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:55:45,795 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 11:55:46,406 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:55:46,661 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 11:55:46,932 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 11:55:47,484 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:47,992 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:55:48,477 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:55:48,918 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:49,741 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:55:50,750 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 11:55:51,032 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 11:55:51,468 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:51,996 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:55:52,977 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:55:53,441 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:53,874 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:55:54,238 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:54,594 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:54,916 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:55:55,201 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:55,502 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 11:55:55,829 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:55:56,886 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:55:57,913 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:55:58,428 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:55:58,922 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:55:59,802 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:56:00,816 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:56:01,130 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 11:56:01,491 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-21 11:56:01,811 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 11:56:02,107 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 11:56:02,409 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 11:56:04,981 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 11:56:05,355 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 11:56:05,696 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 11:56:06,010 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 11:56:06,319 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 11:56:06,877 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 11:56:08,031 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 11:56:08,435 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 11:56:08,828 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 11:56:09,202 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 11:56:09,553 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 11:56:11,601 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 11:56:12,096 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 11:56:12,589 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 11:56:15,215 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 11:56:15,765 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 11:56:16,310 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 11:56:16,830 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 11:56:18,490 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 11:56:18,860 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 11:56:19,190 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 11:56:19,482 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 11:56:19,795 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 11:56:21,716 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 11:56:22,316 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 11:56:22,883 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 11:56:24,335 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 11:56:25,497 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 20 [2020-07-21 11:56:25,888 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 11:56:26,178 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 11:56:26,610 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 11:56:26,898 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:56:28,451 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 11:56:28,974 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 11:56:29,933 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 11:56:30,551 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:56:31,535 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 11:56:31,916 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 11:56:32,281 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 11:56:32,586 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 11:56:32,840 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 11:56:33,839 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 11:56:34,019 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 11:56:34,354 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:56:34,572 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-21 11:56:34,850 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:56:35,300 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 11:56:35,555 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:56:35,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:56:35,639 INFO L93 Difference]: Finished difference Result 1607 states and 2160 transitions. [2020-07-21 11:56:35,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 267 states. [2020-07-21 11:56:35,646 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 1506 [2020-07-21 11:56:35,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:56:35,650 INFO L225 Difference]: With dead ends: 1607 [2020-07-21 11:56:35,651 INFO L226 Difference]: Without dead ends: 1216 [2020-07-21 11:56:35,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3272 GetRequests, 2953 SyntacticMatches, 8 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43103 ImplicationChecksByTransitivity, 70.5s TimeCoverageRelationStatistics Valid=21324, Invalid=76332, Unknown=0, NotChecked=0, Total=97656 [2020-07-21 11:56:35,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1216 states. [2020-07-21 11:56:35,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1216 to 1022. [2020-07-21 11:56:35,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1022 states. [2020-07-21 11:56:35,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1022 states to 1022 states and 1351 transitions. [2020-07-21 11:56:35,857 INFO L78 Accepts]: Start accepts. Automaton has 1022 states and 1351 transitions. Word has length 1506 [2020-07-21 11:56:35,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:56:35,858 INFO L479 AbstractCegarLoop]: Abstraction has 1022 states and 1351 transitions. [2020-07-21 11:56:35,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-21 11:56:35,858 INFO L276 IsEmpty]: Start isEmpty. Operand 1022 states and 1351 transitions. [2020-07-21 11:56:35,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1597 [2020-07-21 11:56:35,876 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:56:35,876 INFO L422 BasicCegarLoop]: trace histogram [211, 211, 211, 210, 210, 210, 210, 29, 28, 28, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:56:36,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:56:36,077 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:56:36,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:56:36,078 INFO L82 PathProgramCache]: Analyzing trace with hash 458941342, now seen corresponding path program 58 times [2020-07-21 11:56:36,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:56:36,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1220099697] [2020-07-21 11:56:36,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:56:36,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:56:36,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 2787 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-21 11:56:36,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:56:41,132 INFO L134 CoverageAnalysis]: Checked inductivity of 161849 backedges. 69978 proven. 7332 refuted. 0 times theorem prover too weak. 84539 trivial. 0 not checked. [2020-07-21 11:56:41,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:56:50,681 INFO L134 CoverageAnalysis]: Checked inductivity of 161849 backedges. 34361 proven. 31279 refuted. 0 times theorem prover too weak. 96209 trivial. 0 not checked. [2020-07-21 11:56:50,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1220099697] [2020-07-21 11:56:50,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:56:50,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 50 [2020-07-21 11:56:50,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443216029] [2020-07-21 11:56:50,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 11:56:50,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:56:50,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 11:56:50,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=1952, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 11:56:50,683 INFO L87 Difference]: Start difference. First operand 1022 states and 1351 transitions. Second operand 50 states. [2020-07-21 11:57:13,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:57:13,505 INFO L93 Difference]: Finished difference Result 1433 states and 1934 transitions. [2020-07-21 11:57:13,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-21 11:57:13,513 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 1596 [2020-07-21 11:57:13,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:57:13,518 INFO L225 Difference]: With dead ends: 1433 [2020-07-21 11:57:13,518 INFO L226 Difference]: Without dead ends: 1087 [2020-07-21 11:57:13,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3275 GetRequests, 3135 SyntacticMatches, 8 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4305 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=4995, Invalid=12827, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 11:57:13,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1087 states. [2020-07-21 11:57:13,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1087 to 1074. [2020-07-21 11:57:13,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1074 states. [2020-07-21 11:57:13,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1074 states to 1074 states and 1424 transitions. [2020-07-21 11:57:13,729 INFO L78 Accepts]: Start accepts. Automaton has 1074 states and 1424 transitions. Word has length 1596 [2020-07-21 11:57:13,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:57:13,729 INFO L479 AbstractCegarLoop]: Abstraction has 1074 states and 1424 transitions. [2020-07-21 11:57:13,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 11:57:13,730 INFO L276 IsEmpty]: Start isEmpty. Operand 1074 states and 1424 transitions. [2020-07-21 11:57:13,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1604 [2020-07-21 11:57:13,748 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:57:13,748 INFO L422 BasicCegarLoop]: trace histogram [212, 212, 212, 211, 211, 211, 211, 29, 28, 28, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:57:13,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:57:13,949 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:57:13,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:57:13,950 INFO L82 PathProgramCache]: Analyzing trace with hash -1774566281, now seen corresponding path program 59 times [2020-07-21 11:57:13,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:57:13,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2085506212] [2020-07-21 11:57:13,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:57:14,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:57:14,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 2799 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 11:57:14,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:57:17,357 INFO L134 CoverageAnalysis]: Checked inductivity of 163351 backedges. 10903 proven. 54378 refuted. 0 times theorem prover too weak. 98070 trivial. 0 not checked. [2020-07-21 11:57:17,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:57:25,939 INFO L134 CoverageAnalysis]: Checked inductivity of 163351 backedges. 5205 proven. 54378 refuted. 0 times theorem prover too weak. 103768 trivial. 0 not checked. [2020-07-21 11:57:25,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2085506212] [2020-07-21 11:57:25,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:57:25,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 31 [2020-07-21 11:57:25,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765967013] [2020-07-21 11:57:25,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 11:57:25,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:57:25,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 11:57:25,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=716, Unknown=0, NotChecked=0, Total=930 [2020-07-21 11:57:25,942 INFO L87 Difference]: Start difference. First operand 1074 states and 1424 transitions. Second operand 31 states. [2020-07-21 11:57:26,490 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 14 [2020-07-21 11:57:26,707 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2020-07-21 11:57:26,921 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 17 [2020-07-21 11:57:27,177 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 16 [2020-07-21 11:57:27,544 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 13 [2020-07-21 11:57:27,797 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2020-07-21 11:57:28,051 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2020-07-21 11:57:28,333 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 11:57:29,498 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 14 [2020-07-21 11:57:29,738 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:57:29,958 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2020-07-21 11:57:30,205 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2020-07-21 11:57:30,452 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 11:57:31,859 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 14 [2020-07-21 11:57:32,152 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:57:32,415 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-07-21 11:57:32,681 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:57:33,185 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 11:57:35,218 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 14 [2020-07-21 11:57:35,515 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:57:35,978 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:57:36,219 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:57:36,459 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2020-07-21 11:57:36,717 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 11:57:39,105 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 14 [2020-07-21 11:57:39,389 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:57:39,656 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-07-21 11:57:39,917 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 11:57:40,173 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 11:57:40,406 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:57:40,667 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2020-07-21 11:57:40,981 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 11:57:43,593 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 14 [2020-07-21 11:57:43,942 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:57:44,267 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-07-21 11:57:44,585 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 11:57:44,893 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:57:45,188 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 11:57:45,421 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:57:45,718 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2020-07-21 11:57:45,995 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:57:48,721 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 14 [2020-07-21 11:57:49,014 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 11:57:49,298 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2020-07-21 11:57:50,071 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 11:57:50,364 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 11:57:50,644 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 11:57:50,910 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 11:57:51,539 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2020-07-21 11:57:51,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:57:51,904 INFO L93 Difference]: Finished difference Result 2222 states and 3006 transitions. [2020-07-21 11:57:51,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2020-07-21 11:57:51,911 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 1603 [2020-07-21 11:57:51,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:57:51,918 INFO L225 Difference]: With dead ends: 2222 [2020-07-21 11:57:51,919 INFO L226 Difference]: Without dead ends: 1859 [2020-07-21 11:57:51,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3321 GetRequests, 3167 SyntacticMatches, 9 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8734 ImplicationChecksByTransitivity, 22.4s TimeCoverageRelationStatistics Valid=4422, Invalid=17040, Unknown=0, NotChecked=0, Total=21462 [2020-07-21 11:57:51,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1859 states. [2020-07-21 11:57:52,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1859 to 1336. [2020-07-21 11:57:52,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1336 states. [2020-07-21 11:57:52,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1336 states to 1336 states and 1767 transitions. [2020-07-21 11:57:52,456 INFO L78 Accepts]: Start accepts. Automaton has 1336 states and 1767 transitions. Word has length 1603 [2020-07-21 11:57:52,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:57:52,457 INFO L479 AbstractCegarLoop]: Abstraction has 1336 states and 1767 transitions. [2020-07-21 11:57:52,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 11:57:52,457 INFO L276 IsEmpty]: Start isEmpty. Operand 1336 states and 1767 transitions. [2020-07-21 11:57:52,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1656 [2020-07-21 11:57:52,475 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:57:52,476 INFO L422 BasicCegarLoop]: trace histogram [219, 219, 219, 218, 218, 218, 218, 30, 29, 29, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:57:52,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:57:52,689 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:57:52,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:57:52,690 INFO L82 PathProgramCache]: Analyzing trace with hash -463441743, now seen corresponding path program 60 times [2020-07-21 11:57:52,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:57:52,691 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [426431010] [2020-07-21 11:57:52,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:57:53,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:57:53,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 2889 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 11:57:53,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:57:55,779 INFO L134 CoverageAnalysis]: Checked inductivity of 174373 backedges. 71882 proven. 4606 refuted. 0 times theorem prover too weak. 97885 trivial. 0 not checked. [2020-07-21 11:57:55,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:58:05,190 INFO L134 CoverageAnalysis]: Checked inductivity of 174373 backedges. 59696 proven. 4642 refuted. 0 times theorem prover too weak. 110035 trivial. 0 not checked. [2020-07-21 11:58:05,191 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [426431010] [2020-07-21 11:58:05,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:58:05,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2020-07-21 11:58:05,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213542985] [2020-07-21 11:58:05,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 11:58:05,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:58:05,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 11:58:05,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=619, Unknown=0, NotChecked=0, Total=812 [2020-07-21 11:58:05,193 INFO L87 Difference]: Start difference. First operand 1336 states and 1767 transitions. Second operand 29 states. [2020-07-21 11:58:10,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:58:10,997 INFO L93 Difference]: Finished difference Result 1717 states and 2304 transitions. [2020-07-21 11:58:11,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 11:58:11,005 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 1655 [2020-07-21 11:58:11,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:58:11,011 INFO L225 Difference]: With dead ends: 1717 [2020-07-21 11:58:11,011 INFO L226 Difference]: Without dead ends: 1102 [2020-07-21 11:58:11,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3329 GetRequests, 3273 SyntacticMatches, 9 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=643, Invalid=1709, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 11:58:11,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1102 states. [2020-07-21 11:58:11,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1102 to 1102. [2020-07-21 11:58:11,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1102 states. [2020-07-21 11:58:11,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1102 states to 1102 states and 1458 transitions. [2020-07-21 11:58:11,464 INFO L78 Accepts]: Start accepts. Automaton has 1102 states and 1458 transitions. Word has length 1655 [2020-07-21 11:58:11,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:58:11,466 INFO L479 AbstractCegarLoop]: Abstraction has 1102 states and 1458 transitions. [2020-07-21 11:58:11,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 11:58:11,466 INFO L276 IsEmpty]: Start isEmpty. Operand 1102 states and 1458 transitions. [2020-07-21 11:58:11,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1663 [2020-07-21 11:58:11,499 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:58:11,500 INFO L422 BasicCegarLoop]: trace histogram [220, 220, 220, 219, 219, 219, 219, 30, 29, 29, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:58:11,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:58:11,714 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:58:11,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:58:11,715 INFO L82 PathProgramCache]: Analyzing trace with hash -1520140692, now seen corresponding path program 61 times [2020-07-21 11:58:11,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:58:11,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [931355337] [2020-07-21 11:58:11,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:58:12,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:58:12,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 2901 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 11:58:12,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:58:15,661 INFO L134 CoverageAnalysis]: Checked inductivity of 175932 backedges. 9882 proven. 60445 refuted. 0 times theorem prover too weak. 105605 trivial. 0 not checked. [2020-07-21 11:58:15,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:58:25,510 INFO L134 CoverageAnalysis]: Checked inductivity of 175932 backedges. 4782 proven. 60445 refuted. 0 times theorem prover too weak. 110705 trivial. 0 not checked. [2020-07-21 11:58:25,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [931355337] [2020-07-21 11:58:25,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:58:25,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 35 [2020-07-21 11:58:25,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030791019] [2020-07-21 11:58:25,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 11:58:25,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:58:25,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 11:58:25,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=935, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 11:58:25,513 INFO L87 Difference]: Start difference. First operand 1102 states and 1458 transitions. Second operand 35 states. [2020-07-21 11:58:26,155 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2020-07-21 11:58:26,401 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 11:58:26,717 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 11:58:27,097 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 11:58:27,502 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-07-21 11:58:27,791 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:58:28,329 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 11:58:28,606 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 16 [2020-07-21 11:58:28,880 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 11:58:29,126 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 11:58:29,436 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 11:58:29,741 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 11:58:30,132 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 11:58:30,555 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 11:58:30,808 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 11:58:31,063 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 11:58:31,325 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 11:58:31,620 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 11:58:31,917 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 11:58:32,209 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:58:32,478 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:58:32,756 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:58:33,052 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:58:33,370 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 11:58:35,303 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 11:58:35,660 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 11:58:35,960 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 11:58:36,243 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 11:58:36,472 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 11:58:36,786 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 11:58:37,089 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 11:58:37,410 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:58:37,751 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:58:38,082 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:58:38,363 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:58:38,682 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:58:38,944 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 11:58:41,273 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 11:58:41,643 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 11:58:41,969 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 11:58:42,234 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 11:58:42,518 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 11:58:42,816 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 11:58:43,159 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 11:58:43,559 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 11:58:43,962 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:58:44,331 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:58:44,632 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:58:44,940 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:58:45,205 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:58:45,529 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:58:45,882 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 11:58:51,500 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 11:58:51,900 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 11:58:52,210 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 11:58:52,543 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 11:58:52,851 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 11:58:53,139 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 11:58:53,503 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 11:58:53,891 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 11:58:54,325 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 11:58:54,707 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 11:58:55,084 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:58:55,452 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:58:55,803 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 11:58:56,121 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:58:56,428 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:58:56,789 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 11:58:57,148 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 11:59:03,584 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 11:59:03,989 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 11:59:04,383 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 11:59:04,755 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 11:59:05,087 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 11:59:05,420 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 11:59:05,734 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 11:59:06,086 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 11:59:06,494 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 11:59:06,966 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 11:59:07,397 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:59:07,834 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:59:08,251 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:59:08,675 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:59:09,086 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:59:09,406 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 11:59:09,713 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 11:59:10,066 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 11:59:10,404 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 11:59:14,620 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 11:59:15,027 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 11:59:15,441 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 11:59:15,838 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 11:59:16,148 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18