/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 SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_25-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 15:59:28,613 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 15:59:28,616 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 15:59:28,636 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 15:59:28,636 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 15:59:28,638 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 15:59:28,640 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 15:59:28,650 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 15:59:28,655 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 15:59:28,658 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 15:59:28,660 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 15:59:28,661 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 15:59:28,661 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 15:59:28,663 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 15:59:28,665 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 15:59:28,666 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 15:59:28,668 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 15:59:28,669 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 15:59:28,671 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 15:59:28,676 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 15:59:28,681 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 15:59:28,684 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 15:59:28,685 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 15:59:28,686 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 15:59:28,689 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 15:59:28,700 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 15:59:28,701 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 15:59:28,702 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 15:59:28,703 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 15:59:28,729 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 15:59:28,729 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 15:59:28,730 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 15:59:28,731 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 15:59:28,731 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 15:59:28,731 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 15:59:28,731 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 15:59:28,731 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 15:59:28,731 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 15:59:28,731 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 15:59:28,732 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 15:59:28,732 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 15:59:28,732 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 15:59:28,732 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 15:59:28,732 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 15:59:28,733 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 15:59:28,733 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 15:59:28,733 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 15:59:28,733 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 15:59:28,734 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 15:59:28,734 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 15:59:28,734 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:59:28,734 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 15:59:28,735 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 15:59:28,735 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 15:59:28,735 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 15:59:28,735 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:28,735 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 15:59:28,736 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 15:59:28,736 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 -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 15:59:29,044 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 15:59:29,061 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 15:59:29,065 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 15:59:29,068 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 15:59:29,069 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 15:59:29,069 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_25-1.c [2020-07-21 15:59:29,161 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f322fb91e/c4ec9849b3044c4c9468ae762a3e84bc/FLAG10d500188 [2020-07-21 15:59:29,696 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 15:59:29,697 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_25-1.c [2020-07-21 15:59:29,704 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f322fb91e/c4ec9849b3044c4c9468ae762a3e84bc/FLAG10d500188 [2020-07-21 15:59:30,057 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f322fb91e/c4ec9849b3044c4c9468ae762a3e84bc [2020-07-21 15:59:30,066 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 15:59:30,069 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 15:59:30,071 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 15:59:30,071 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 15:59:30,074 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 15:59:30,076 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:59:30" (1/1) ... [2020-07-21 15:59:30,079 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@656f572e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:30, skipping insertion in model container [2020-07-21 15:59:30,079 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:59:30" (1/1) ... [2020-07-21 15:59:30,087 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 15:59:30,106 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 15:59:30,308 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:59:30,311 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 15:59:30,327 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:59:30,339 INFO L208 MainTranslator]: Completed translation [2020-07-21 15:59:30,340 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:30 WrapperNode [2020-07-21 15:59:30,340 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 15:59:30,341 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 15:59:30,341 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 15:59:30,341 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 15:59:30,350 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:30" (1/1) ... [2020-07-21 15:59:30,351 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:30" (1/1) ... [2020-07-21 15:59:30,432 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:30" (1/1) ... [2020-07-21 15:59:30,432 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:30" (1/1) ... [2020-07-21 15:59:30,437 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:30" (1/1) ... [2020-07-21 15:59:30,439 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:30" (1/1) ... [2020-07-21 15:59:30,440 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:30" (1/1) ... [2020-07-21 15:59:30,441 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 15:59:30,442 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 15:59:30,442 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 15:59:30,442 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 15:59:30,443 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:30" (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 15:59:30,508 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 15:59:30,508 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 15:59:30,508 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 15:59:30,508 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 15:59:30,509 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 15:59:30,509 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 15:59:30,509 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 15:59:30,509 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 15:59:30,509 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 15:59:30,510 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 15:59:30,510 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 15:59:30,510 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 15:59:30,716 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 15:59:30,716 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 15:59:30,721 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:59:30 BoogieIcfgContainer [2020-07-21 15:59:30,721 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 15:59:30,722 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 15:59:30,723 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 15:59:30,726 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 15:59:30,727 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 03:59:30" (1/3) ... [2020-07-21 15:59:30,728 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fc66675 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:59:30, skipping insertion in model container [2020-07-21 15:59:30,729 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:30" (2/3) ... [2020-07-21 15:59:30,729 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fc66675 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:59:30, skipping insertion in model container [2020-07-21 15:59:30,729 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:59:30" (3/3) ... [2020-07-21 15:59:30,732 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_25-1.c [2020-07-21 15:59:30,745 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 15:59:30,752 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 15:59:30,775 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 15:59:30,813 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 15:59:30,814 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 15:59:30,814 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 15:59:30,814 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 15:59:30,815 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 15:59:30,815 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 15:59:30,815 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 15:59:30,816 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 15:59:30,839 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 15:59:30,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 15:59:30,849 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:30,851 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:30,852 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:30,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:30,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 15:59:30,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:30,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1476427454] [2020-07-21 15:59:30,876 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:30,978 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:30,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:30,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:59:30,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:31,078 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 15:59:31,078 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:59:31,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1476427454] [2020-07-21 15:59:31,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:59:31,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:59:31,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460849314] [2020-07-21 15:59:31,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:59:31,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:31,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:59:31,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:59:31,107 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 15:59:31,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:31,228 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 15:59:31,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:59:31,230 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 15:59:31,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:31,241 INFO L225 Difference]: With dead ends: 44 [2020-07-21 15:59:31,242 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 15:59:31,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:59:31,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 15:59:31,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 15:59:31,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 15:59:31,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 15:59:31,295 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 15:59:31,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:31,295 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 15:59:31,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:59:31,296 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 15:59:31,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 15:59:31,297 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:31,298 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:31,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:31,505 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:31,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:31,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 15:59:31,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:31,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [935496948] [2020-07-21 15:59:31,508 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:31,547 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:31,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:31,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:59:31,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:31,588 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 15:59:31,589 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:59:31,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [935496948] [2020-07-21 15:59:31,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:59:31,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:59:31,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908173494] [2020-07-21 15:59:31,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:59:31,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:31,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:59:31,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:59:31,595 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 15:59:31,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:31,672 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 15:59:31,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:59:31,673 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 15:59:31,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:31,675 INFO L225 Difference]: With dead ends: 36 [2020-07-21 15:59:31,675 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 15:59:31,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:59:31,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 15:59:31,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 15:59:31,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 15:59:31,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 15:59:31,687 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 15:59:31,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:31,688 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 15:59:31,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:59:31,688 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 15:59:31,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 15:59:31,690 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:31,690 INFO L422 BasicCegarLoop]: trace histogram [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 15:59:31,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:31,905 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:31,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:31,906 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 15:59:31,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:31,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [277457554] [2020-07-21 15:59:31,907 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:31,941 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:31,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:31,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:59:31,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:32,022 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:59:32,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:32,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:32,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:32,282 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:59:32,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [277457554] [2020-07-21 15:59:32,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:32,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:59:32,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838847389] [2020-07-21 15:59:32,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:59:32,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:32,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:59:32,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:59:32,289 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 15:59:32,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:32,443 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 15:59:32,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:59:32,444 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 15:59:32,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:32,446 INFO L225 Difference]: With dead ends: 41 [2020-07-21 15:59:32,447 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 15:59:32,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:32,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 15:59:32,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 15:59:32,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 15:59:32,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 15:59:32,470 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 15:59:32,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:32,471 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 15:59:32,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:59:32,471 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 15:59:32,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 15:59:32,474 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:32,475 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:32,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:32,686 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:32,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:32,687 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 15:59:32,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:32,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698749608] [2020-07-21 15:59:32,689 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:32,725 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:32,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:32,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:59:32,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:32,787 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:59:32,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:32,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:32,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:32,998 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:59:32,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698749608] [2020-07-21 15:59:32,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:33,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:59:33,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43392457] [2020-07-21 15:59:33,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:59:33,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:33,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:59:33,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:59:33,002 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 15:59:33,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:33,127 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 15:59:33,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:59:33,128 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 15:59:33,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:33,130 INFO L225 Difference]: With dead ends: 46 [2020-07-21 15:59:33,131 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 15:59:33,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:33,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 15:59:33,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 15:59:33,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 15:59:33,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 15:59:33,150 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 15:59:33,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:33,151 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 15:59:33,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:59:33,152 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 15:59:33,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 15:59:33,155 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:33,156 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:33,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:33,371 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:33,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:33,372 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 15:59:33,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:33,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952674719] [2020-07-21 15:59:33,372 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:33,415 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:33,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:33,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:33,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:33,474 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 15:59:33,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:33,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:33,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:33,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:33,826 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:59:33,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [952674719] [2020-07-21 15:59:33,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:33,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:59:33,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818360368] [2020-07-21 15:59:33,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:33,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:33,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:33,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:33,829 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 15:59:34,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:34,008 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 15:59:34,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:34,009 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 15:59:34,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:34,011 INFO L225 Difference]: With dead ends: 51 [2020-07-21 15:59:34,011 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 15:59:34,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:59:34,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 15:59:34,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 15:59:34,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 15:59:34,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 15:59:34,024 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 15:59:34,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:34,025 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 15:59:34,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:34,025 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 15:59:34,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 15:59:34,027 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:34,027 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:34,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:34,231 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:34,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:34,231 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 15:59:34,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:34,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1239687614] [2020-07-21 15:59:34,233 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:34,267 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:34,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:34,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:34,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:34,332 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 15:59:34,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:34,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:34,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:34,635 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 15:59:34,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1239687614] [2020-07-21 15:59:34,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:34,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 15:59:34,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043948029] [2020-07-21 15:59:34,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:34,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:34,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:34,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:34,638 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 15:59:34,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:34,925 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-21 15:59:34,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:34,926 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 15:59:34,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:34,928 INFO L225 Difference]: With dead ends: 84 [2020-07-21 15:59:34,933 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 15:59:34,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:59:34,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 15:59:34,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-21 15:59:34,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 15:59:34,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-21 15:59:34,978 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-21 15:59:34,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:34,979 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-21 15:59:34,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:34,979 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-21 15:59:34,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 15:59:34,986 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:34,987 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:35,201 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:35,203 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:35,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:35,203 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-21 15:59:35,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:35,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207004517] [2020-07-21 15:59:35,205 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:35,249 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:35,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:35,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:35,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:35,296 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 15:59:35,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:35,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:35,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:35,608 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:59:35,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207004517] [2020-07-21 15:59:35,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:35,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:59:35,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414917521] [2020-07-21 15:59:35,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:35,610 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:35,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:35,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:35,611 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-21 15:59:35,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:35,754 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 15:59:35,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:35,754 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-21 15:59:35,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:35,756 INFO L225 Difference]: With dead ends: 63 [2020-07-21 15:59:35,757 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 15:59:35,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:59:35,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 15:59:35,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-21 15:59:35,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 15:59:35,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-21 15:59:35,770 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-21 15:59:35,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:35,770 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-21 15:59:35,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:35,770 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-21 15:59:35,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 15:59:35,773 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:35,773 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 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 15:59:35,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:35,981 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:35,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:35,981 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-21 15:59:35,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:35,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [40003180] [2020-07-21 15:59:35,983 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:36,021 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:36,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:36,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:59:36,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:36,073 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 15:59:36,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:36,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:36,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:36,307 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 15:59:36,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [40003180] [2020-07-21 15:59:36,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:36,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:59:36,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178649230] [2020-07-21 15:59:36,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:59:36,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:36,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:59:36,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:59:36,314 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-21 15:59:36,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:36,440 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-21 15:59:36,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:59:36,440 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-21 15:59:36,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:36,443 INFO L225 Difference]: With dead ends: 65 [2020-07-21 15:59:36,443 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 15:59:36,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:36,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 15:59:36,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-21 15:59:36,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 15:59:36,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-21 15:59:36,474 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-21 15:59:36,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:36,474 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-21 15:59:36,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:59:36,475 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-21 15:59:36,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 15:59:36,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:36,478 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:36,682 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:36,683 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:36,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:36,684 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-21 15:59:36,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:36,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [711253655] [2020-07-21 15:59:36,686 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:36,736 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:36,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:36,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:59:36,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:36,811 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 15:59:36,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:37,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,389 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 15:59:37,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [711253655] [2020-07-21 15:59:37,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:37,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:59:37,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981772731] [2020-07-21 15:59:37,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:59:37,391 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:37,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:59:37,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:59:37,392 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-21 15:59:37,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:37,584 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-21 15:59:37,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:59:37,585 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-21 15:59:37,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:37,587 INFO L225 Difference]: With dead ends: 75 [2020-07-21 15:59:37,587 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 15:59:37,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:59:37,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 15:59:37,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-21 15:59:37,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 15:59:37,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-21 15:59:37,612 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-21 15:59:37,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:37,613 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-21 15:59:37,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:59:37,613 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-21 15:59:37,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 15:59:37,614 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:37,614 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:37,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:37,816 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:37,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:37,817 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-21 15:59:37,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:37,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598137161] [2020-07-21 15:59:37,818 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:37,856 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:37,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:37,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:37,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:37,915 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 15:59:37,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:38,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,290 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 15:59:38,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598137161] [2020-07-21 15:59:38,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:38,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 15:59:38,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224701414] [2020-07-21 15:59:38,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:38,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:38,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:38,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:38,292 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-21 15:59:38,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:38,499 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-21 15:59:38,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:38,500 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-21 15:59:38,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:38,502 INFO L225 Difference]: With dead ends: 114 [2020-07-21 15:59:38,502 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 15:59:38,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:59:38,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 15:59:38,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 15:59:38,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 15:59:38,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-21 15:59:38,532 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-21 15:59:38,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:38,533 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-21 15:59:38,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:38,533 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-21 15:59:38,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 15:59:38,538 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:38,538 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:38,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:38,752 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:38,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:38,752 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-21 15:59:38,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:38,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262856458] [2020-07-21 15:59:38,754 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:38,794 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:38,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:38,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:38,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:38,907 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 15:59:38,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:39,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:39,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:39,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:39,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:39,517 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 15:59:39,517 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262856458] [2020-07-21 15:59:39,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:39,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 15:59:39,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069477930] [2020-07-21 15:59:39,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 15:59:39,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:39,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 15:59:39,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:59:39,520 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-21 15:59:39,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:39,935 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-21 15:59:39,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 15:59:39,936 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-21 15:59:39,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:39,938 INFO L225 Difference]: With dead ends: 131 [2020-07-21 15:59:39,939 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 15:59:39,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 15:59:39,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 15:59:39,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-21 15:59:39,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-21 15:59:39,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-21 15:59:39,965 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-21 15:59:39,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:39,966 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-21 15:59:39,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 15:59:39,966 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-21 15:59:39,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 15:59:39,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:39,971 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:40,172 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:40,173 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:40,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:40,174 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-21 15:59:40,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:40,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [374508534] [2020-07-21 15:59:40,175 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:40,239 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:40,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:40,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:59:40,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:40,351 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 15:59:40,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:40,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:41,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:41,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:41,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:41,167 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 15:59:41,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [374508534] [2020-07-21 15:59:41,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:41,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 15:59:41,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215295262] [2020-07-21 15:59:41,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:59:41,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:41,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:59:41,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:59:41,169 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-21 15:59:41,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:41,999 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-21 15:59:42,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 15:59:42,000 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-21 15:59:42,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:42,005 INFO L225 Difference]: With dead ends: 186 [2020-07-21 15:59:42,006 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 15:59:42,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 15:59:42,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 15:59:42,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-21 15:59:42,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 15:59:42,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-21 15:59:42,025 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-21 15:59:42,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:42,025 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-21 15:59:42,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 15:59:42,026 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-21 15:59:42,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 15:59:42,027 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:42,027 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:42,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:42,235 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:42,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:42,235 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-21 15:59:42,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:42,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437846963] [2020-07-21 15:59:42,237 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:42,289 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:42,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:42,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:59:42,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:42,346 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-21 15:59:42,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:42,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:42,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:42,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:42,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:42,869 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 15:59:42,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437846963] [2020-07-21 15:59:42,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:42,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:59:42,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916100010] [2020-07-21 15:59:42,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:59:42,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:42,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:59:42,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:59:42,871 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-21 15:59:43,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:43,050 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-21 15:59:43,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:59:43,050 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-21 15:59:43,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:43,053 INFO L225 Difference]: With dead ends: 114 [2020-07-21 15:59:43,053 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 15:59:43,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:59:43,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 15:59:43,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-21 15:59:43,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-21 15:59:43,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-21 15:59:43,064 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-21 15:59:43,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:43,065 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-21 15:59:43,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:59:43,065 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-21 15:59:43,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-21 15:59:43,067 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:43,067 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:43,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:43,268 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:43,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:43,269 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-21 15:59:43,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:43,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1791323259] [2020-07-21 15:59:43,270 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:43,326 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:43,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:43,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:43,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:43,411 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-21 15:59:43,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:43,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:43,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:43,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:44,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:44,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:44,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:44,146 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-21 15:59:44,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1791323259] [2020-07-21 15:59:44,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:44,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-21 15:59:44,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121699104] [2020-07-21 15:59:44,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 15:59:44,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:44,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 15:59:44,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-21 15:59:44,149 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-21 15:59:44,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:44,645 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-21 15:59:44,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 15:59:44,652 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-21 15:59:44,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:44,655 INFO L225 Difference]: With dead ends: 269 [2020-07-21 15:59:44,655 INFO L226 Difference]: Without dead ends: 168 [2020-07-21 15:59:44,657 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-21 15:59:44,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-21 15:59:44,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-21 15:59:44,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 15:59:44,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-21 15:59:44,672 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-21 15:59:44,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:44,673 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-21 15:59:44,673 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 15:59:44,673 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-21 15:59:44,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-21 15:59:44,675 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:44,675 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:44,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:44,889 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:44,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:44,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-21 15:59:44,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:44,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [218853278] [2020-07-21 15:59:44,891 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:44,950 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:44,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:44,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:44,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:44,985 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-21 15:59:44,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:45,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:45,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:45,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:45,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:45,342 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-21 15:59:45,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [218853278] [2020-07-21 15:59:45,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:45,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:59:45,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996511305] [2020-07-21 15:59:45,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:45,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:45,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:45,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:45,344 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-21 15:59:45,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:45,506 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-21 15:59:45,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:45,507 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-21 15:59:45,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:45,511 INFO L225 Difference]: With dead ends: 167 [2020-07-21 15:59:45,512 INFO L226 Difference]: Without dead ends: 163 [2020-07-21 15:59:45,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:59:45,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-21 15:59:45,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-21 15:59:45,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-21 15:59:45,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-21 15:59:45,537 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-21 15:59:45,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:45,538 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-21 15:59:45,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:45,538 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-21 15:59:45,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 15:59:45,544 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:45,545 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:45,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:45,759 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:45,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:45,760 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-21 15:59:45,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:45,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270798711] [2020-07-21 15:59:45,761 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:45,844 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:45,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:45,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:59:45,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:45,949 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-21 15:59:45,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:46,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:46,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:46,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:46,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:47,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:47,113 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-21 15:59:47,113 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270798711] [2020-07-21 15:59:47,113 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:47,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 15:59:47,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595282716] [2020-07-21 15:59:47,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:59:47,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:47,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:59:47,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:59:47,116 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-21 15:59:47,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:47,670 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-21 15:59:47,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 15:59:47,670 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-21 15:59:47,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:47,674 INFO L225 Difference]: With dead ends: 369 [2020-07-21 15:59:47,675 INFO L226 Difference]: Without dead ends: 218 [2020-07-21 15:59:47,678 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 15:59:47,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-21 15:59:47,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-21 15:59:47,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-21 15:59:47,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-21 15:59:47,702 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-21 15:59:47,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:47,703 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-21 15:59:47,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 15:59:47,703 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-21 15:59:47,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-21 15:59:47,706 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:47,706 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:47,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:47,920 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:47,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:47,921 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-21 15:59:47,921 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:47,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311544440] [2020-07-21 15:59:47,921 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:47,998 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:47,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:48,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:48,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:48,045 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-21 15:59:48,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:48,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:48,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:48,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:48,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:48,434 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 15:59:48,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311544440] [2020-07-21 15:59:48,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:48,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:59:48,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568718925] [2020-07-21 15:59:48,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:48,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:48,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:48,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:48,442 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-21 15:59:48,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:48,586 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-21 15:59:48,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:48,586 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-21 15:59:48,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:48,589 INFO L225 Difference]: With dead ends: 191 [2020-07-21 15:59:48,589 INFO L226 Difference]: Without dead ends: 187 [2020-07-21 15:59:48,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:59:48,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-21 15:59:48,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-21 15:59:48,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 15:59:48,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-21 15:59:48,608 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-21 15:59:48,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:48,608 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-21 15:59:48,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:48,609 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-21 15:59:48,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 15:59:48,612 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:48,612 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:48,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:48,827 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:48,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:48,827 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-21 15:59:48,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:48,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1493225141] [2020-07-21 15:59:48,828 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:48,925 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:48,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:48,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:48,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:48,985 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-21 15:59:48,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:49,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:49,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:49,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:49,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:49,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:49,888 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-21 15:59:49,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1493225141] [2020-07-21 15:59:49,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:49,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:59:49,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965037313] [2020-07-21 15:59:49,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:59:49,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:49,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:59:49,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:59:49,890 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 16 states. [2020-07-21 15:59:50,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:50,101 INFO L93 Difference]: Finished difference Result 206 states and 384 transitions. [2020-07-21 15:59:50,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:59:50,101 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 117 [2020-07-21 15:59:50,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:50,105 INFO L225 Difference]: With dead ends: 206 [2020-07-21 15:59:50,105 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 15:59:50,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:59:50,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 15:59:50,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 186. [2020-07-21 15:59:50,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2020-07-21 15:59:50,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 342 transitions. [2020-07-21 15:59:50,122 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 342 transitions. Word has length 117 [2020-07-21 15:59:50,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:50,122 INFO L479 AbstractCegarLoop]: Abstraction has 186 states and 342 transitions. [2020-07-21 15:59:50,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:59:50,122 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 342 transitions. [2020-07-21 15:59:50,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 15:59:50,125 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:50,125 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:50,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:50,339 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:50,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:50,340 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-21 15:59:50,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:50,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1268413729] [2020-07-21 15:59:50,341 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:50,432 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:50,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:50,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:50,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:50,514 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 15:59:50,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:51,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,371 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-21 15:59:51,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1268413729] [2020-07-21 15:59:51,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:51,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 15:59:51,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800202374] [2020-07-21 15:59:51,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 15:59:51,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:51,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 15:59:51,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:59:51,373 INFO L87 Difference]: Start difference. First operand 186 states and 342 transitions. Second operand 17 states. [2020-07-21 15:59:51,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:51,714 INFO L93 Difference]: Finished difference Result 376 states and 717 transitions. [2020-07-21 15:59:51,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 15:59:51,715 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-21 15:59:51,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:51,718 INFO L225 Difference]: With dead ends: 376 [2020-07-21 15:59:51,718 INFO L226 Difference]: Without dead ends: 192 [2020-07-21 15:59:51,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 15:59:51,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-21 15:59:51,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-21 15:59:51,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 15:59:51,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 336 transitions. [2020-07-21 15:59:51,737 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 336 transitions. Word has length 120 [2020-07-21 15:59:51,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:51,737 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 336 transitions. [2020-07-21 15:59:51,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 15:59:51,738 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 336 transitions. [2020-07-21 15:59:51,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-21 15:59:51,742 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:51,743 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 9, 9, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:51,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:51,958 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:51,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:51,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1301266126, now seen corresponding path program 6 times [2020-07-21 15:59:51,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:51,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1941052] [2020-07-21 15:59:51,960 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:52,082 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:52,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:52,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:59:52,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:52,218 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 145 proven. 298 refuted. 0 times theorem prover too weak. 457 trivial. 0 not checked. [2020-07-21 15:59:52,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:53,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,973 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 147 proven. 306 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2020-07-21 15:59:53,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1941052] [2020-07-21 15:59:53,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:53,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-21 15:59:53,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269223080] [2020-07-21 15:59:53,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 15:59:53,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:53,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 15:59:53,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2020-07-21 15:59:53,975 INFO L87 Difference]: Start difference. First operand 190 states and 336 transitions. Second operand 25 states. [2020-07-21 15:59:54,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:54,989 INFO L93 Difference]: Finished difference Result 479 states and 998 transitions. [2020-07-21 15:59:54,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 15:59:54,996 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 187 [2020-07-21 15:59:54,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:55,000 INFO L225 Difference]: With dead ends: 479 [2020-07-21 15:59:55,000 INFO L226 Difference]: Without dead ends: 294 [2020-07-21 15:59:55,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 335 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=306, Invalid=1500, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 15:59:55,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-21 15:59:55,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 239. [2020-07-21 15:59:55,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-07-21 15:59:55,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 445 transitions. [2020-07-21 15:59:55,026 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 445 transitions. Word has length 187 [2020-07-21 15:59:55,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:55,027 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 445 transitions. [2020-07-21 15:59:55,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 15:59:55,027 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 445 transitions. [2020-07-21 15:59:55,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 15:59:55,031 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:55,031 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:55,243 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:55,244 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:55,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:55,244 INFO L82 PathProgramCache]: Analyzing trace with hash 2011292190, now seen corresponding path program 7 times [2020-07-21 15:59:55,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:55,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1225304895] [2020-07-21 15:59:55,245 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:55,365 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:55,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:55,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:59:55,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:55,537 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 95 proven. 169 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2020-07-21 15:59:55,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:56,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:56,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:56,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:56,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:56,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:57,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:57,098 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 95 proven. 179 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2020-07-21 15:59:57,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1225304895] [2020-07-21 15:59:57,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:57,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 15:59:57,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842796361] [2020-07-21 15:59:57,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 15:59:57,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:57,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 15:59:57,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 15:59:57,102 INFO L87 Difference]: Start difference. First operand 239 states and 445 transitions. Second operand 23 states. [2020-07-21 15:59:57,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:57,928 INFO L93 Difference]: Finished difference Result 491 states and 962 transitions. [2020-07-21 15:59:57,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 15:59:57,928 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 136 [2020-07-21 15:59:57,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:57,931 INFO L225 Difference]: With dead ends: 491 [2020-07-21 15:59:57,932 INFO L226 Difference]: Without dead ends: 257 [2020-07-21 15:59:57,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 241 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 15:59:57,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-21 15:59:57,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 238. [2020-07-21 15:59:57,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-21 15:59:57,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 446 transitions. [2020-07-21 15:59:57,954 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 446 transitions. Word has length 136 [2020-07-21 15:59:57,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:57,954 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 446 transitions. [2020-07-21 15:59:57,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 15:59:57,954 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 446 transitions. [2020-07-21 15:59:57,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-07-21 15:59:57,957 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:57,958 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:58,172 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:58,173 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:58,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:58,173 INFO L82 PathProgramCache]: Analyzing trace with hash -400360989, now seen corresponding path program 8 times [2020-07-21 15:59:58,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:58,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1510745452] [2020-07-21 15:59:58,174 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 15:59:58,280 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:58,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:58,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 15:59:58,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:58,386 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 131 trivial. 0 not checked. [2020-07-21 15:59:58,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:58,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,604 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 85 proven. 131 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2020-07-21 15:59:59,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1510745452] [2020-07-21 15:59:59,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:59,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 15:59:59,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477972058] [2020-07-21 15:59:59,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:59:59,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:59,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:59:59,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:59:59,606 INFO L87 Difference]: Start difference. First operand 238 states and 446 transitions. Second operand 21 states. [2020-07-21 16:00:00,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:00,321 INFO L93 Difference]: Finished difference Result 487 states and 959 transitions. [2020-07-21 16:00:00,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:00:00,323 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 122 [2020-07-21 16:00:00,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:00,328 INFO L225 Difference]: With dead ends: 487 [2020-07-21 16:00:00,328 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 16:00:00,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 209 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=241, Invalid=1091, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:00:00,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 16:00:00,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 232. [2020-07-21 16:00:00,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-21 16:00:00,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 429 transitions. [2020-07-21 16:00:00,354 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 429 transitions. Word has length 122 [2020-07-21 16:00:00,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:00,355 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 429 transitions. [2020-07-21 16:00:00,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:00,355 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 429 transitions. [2020-07-21 16:00:00,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 16:00:00,360 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:00,360 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:00,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:00,576 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:00,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:00,577 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 9 times [2020-07-21 16:00:00,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:00,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [144318158] [2020-07-21 16:00:00,577 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:00,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:00,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:00,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:00,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:00,776 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 20 proven. 107 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 16:00:00,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:01,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:01,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:01,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:01,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:01,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:01,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:01,744 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 20 proven. 117 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-21 16:00:01,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [144318158] [2020-07-21 16:00:01,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:01,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:01,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265414601] [2020-07-21 16:00:01,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:01,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:01,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:01,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:01,746 INFO L87 Difference]: Start difference. First operand 232 states and 429 transitions. Second operand 16 states. [2020-07-21 16:00:01,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:01,978 INFO L93 Difference]: Finished difference Result 239 states and 439 transitions. [2020-07-21 16:00:01,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:01,979 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-21 16:00:01,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:01,983 INFO L225 Difference]: With dead ends: 239 [2020-07-21 16:00:01,983 INFO L226 Difference]: Without dead ends: 235 [2020-07-21 16:00:01,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 193 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:01,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2020-07-21 16:00:01,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 227. [2020-07-21 16:00:01,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2020-07-21 16:00:02,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 414 transitions. [2020-07-21 16:00:02,001 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 414 transitions. Word has length 109 [2020-07-21 16:00:02,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:02,002 INFO L479 AbstractCegarLoop]: Abstraction has 227 states and 414 transitions. [2020-07-21 16:00:02,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:02,002 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 414 transitions. [2020-07-21 16:00:02,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 16:00:02,005 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:02,006 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:02,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:02,219 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:02,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:02,220 INFO L82 PathProgramCache]: Analyzing trace with hash -375419840, now seen corresponding path program 2 times [2020-07-21 16:00:02,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:02,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1092346947] [2020-07-21 16:00:02,221 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:02,342 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:02,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:02,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:02,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:02,475 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 120 proven. 110 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 16:00:02,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:03,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,534 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 120 proven. 113 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2020-07-21 16:00:03,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1092346947] [2020-07-21 16:00:03,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:03,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:00:03,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361452126] [2020-07-21 16:00:03,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:03,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:03,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:03,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:03,536 INFO L87 Difference]: Start difference. First operand 227 states and 414 transitions. Second operand 19 states. [2020-07-21 16:00:04,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:04,019 INFO L93 Difference]: Finished difference Result 472 states and 899 transitions. [2020-07-21 16:00:04,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:00:04,020 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 133 [2020-07-21 16:00:04,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:04,025 INFO L225 Difference]: With dead ends: 472 [2020-07-21 16:00:04,025 INFO L226 Difference]: Without dead ends: 251 [2020-07-21 16:00:04,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 236 SyntacticMatches, 13 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:00:04,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2020-07-21 16:00:04,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 233. [2020-07-21 16:00:04,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2020-07-21 16:00:04,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 411 transitions. [2020-07-21 16:00:04,052 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 411 transitions. Word has length 133 [2020-07-21 16:00:04,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:04,055 INFO L479 AbstractCegarLoop]: Abstraction has 233 states and 411 transitions. [2020-07-21 16:00:04,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:04,055 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 411 transitions. [2020-07-21 16:00:04,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 16:00:04,060 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:04,060 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:04,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:04,274 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:04,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:04,274 INFO L82 PathProgramCache]: Analyzing trace with hash -1996526584, now seen corresponding path program 3 times [2020-07-21 16:00:04,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:04,275 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [536799200] [2020-07-21 16:00:04,275 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:04,404 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:04,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:04,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:04,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:04,467 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 48 proven. 105 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2020-07-21 16:00:04,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:04,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:05,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:05,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:05,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:05,160 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 48 proven. 110 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2020-07-21 16:00:05,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [536799200] [2020-07-21 16:00:05,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:05,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:05,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178308547] [2020-07-21 16:00:05,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:05,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:05,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:05,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:05,168 INFO L87 Difference]: Start difference. First operand 233 states and 411 transitions. Second operand 14 states. [2020-07-21 16:00:05,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:05,376 INFO L93 Difference]: Finished difference Result 271 states and 491 transitions. [2020-07-21 16:00:05,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:05,377 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 133 [2020-07-21 16:00:05,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:05,381 INFO L225 Difference]: With dead ends: 271 [2020-07-21 16:00:05,381 INFO L226 Difference]: Without dead ends: 267 [2020-07-21 16:00:05,383 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 246 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:05,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2020-07-21 16:00:05,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 246. [2020-07-21 16:00:05,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-07-21 16:00:05,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 438 transitions. [2020-07-21 16:00:05,409 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 438 transitions. Word has length 133 [2020-07-21 16:00:05,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:05,410 INFO L479 AbstractCegarLoop]: Abstraction has 246 states and 438 transitions. [2020-07-21 16:00:05,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:05,410 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 438 transitions. [2020-07-21 16:00:05,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 16:00:05,414 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:05,414 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:05,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:05,629 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:05,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:05,629 INFO L82 PathProgramCache]: Analyzing trace with hash -71686390, now seen corresponding path program 10 times [2020-07-21 16:00:05,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:05,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541055206] [2020-07-21 16:00:05,630 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:05,786 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:05,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:05,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:05,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:05,859 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 76 proven. 73 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-07-21 16:00:05,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:06,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,534 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 76 proven. 78 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2020-07-21 16:00:06,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541055206] [2020-07-21 16:00:06,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:06,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:06,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152764060] [2020-07-21 16:00:06,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:06,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:06,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:06,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:06,536 INFO L87 Difference]: Start difference. First operand 246 states and 438 transitions. Second operand 14 states. [2020-07-21 16:00:06,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:06,727 INFO L93 Difference]: Finished difference Result 276 states and 515 transitions. [2020-07-21 16:00:06,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:06,728 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 133 [2020-07-21 16:00:06,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:06,732 INFO L225 Difference]: With dead ends: 276 [2020-07-21 16:00:06,732 INFO L226 Difference]: Without dead ends: 272 [2020-07-21 16:00:06,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 245 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:06,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2020-07-21 16:00:06,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 246. [2020-07-21 16:00:06,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-07-21 16:00:06,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 438 transitions. [2020-07-21 16:00:06,751 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 438 transitions. Word has length 133 [2020-07-21 16:00:06,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:06,752 INFO L479 AbstractCegarLoop]: Abstraction has 246 states and 438 transitions. [2020-07-21 16:00:06,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:06,752 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 438 transitions. [2020-07-21 16:00:06,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2020-07-21 16:00:06,755 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:06,755 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:06,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:06,969 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:06,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:06,970 INFO L82 PathProgramCache]: Analyzing trace with hash -146170438, now seen corresponding path program 4 times [2020-07-21 16:00:06,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:06,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1184877446] [2020-07-21 16:00:06,970 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:07,141 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:07,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:07,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:07,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:07,210 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 139 proven. 46 refuted. 0 times theorem prover too weak. 429 trivial. 0 not checked. [2020-07-21 16:00:07,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:07,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:07,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:07,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:07,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:07,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:07,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:07,936 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 141 proven. 49 refuted. 0 times theorem prover too weak. 424 trivial. 0 not checked. [2020-07-21 16:00:07,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1184877446] [2020-07-21 16:00:07,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:07,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:07,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668181783] [2020-07-21 16:00:07,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:07,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:07,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:07,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:07,938 INFO L87 Difference]: Start difference. First operand 246 states and 438 transitions. Second operand 14 states. [2020-07-21 16:00:08,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:08,111 INFO L93 Difference]: Finished difference Result 256 states and 454 transitions. [2020-07-21 16:00:08,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:08,112 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 157 [2020-07-21 16:00:08,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:08,114 INFO L225 Difference]: With dead ends: 256 [2020-07-21 16:00:08,114 INFO L226 Difference]: Without dead ends: 252 [2020-07-21 16:00:08,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 295 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:08,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2020-07-21 16:00:08,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 246. [2020-07-21 16:00:08,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-07-21 16:00:08,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 438 transitions. [2020-07-21 16:00:08,135 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 438 transitions. Word has length 157 [2020-07-21 16:00:08,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:08,136 INFO L479 AbstractCegarLoop]: Abstraction has 246 states and 438 transitions. [2020-07-21 16:00:08,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:08,136 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 438 transitions. [2020-07-21 16:00:08,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2020-07-21 16:00:08,141 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:08,142 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 13, 11, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:08,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:08,356 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:08,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:08,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1667598659, now seen corresponding path program 11 times [2020-07-21 16:00:08,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:08,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [163259828] [2020-07-21 16:00:08,357 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:08,518 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:08,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:08,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:00:08,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:08,707 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 269 proven. 452 refuted. 0 times theorem prover too weak. 996 trivial. 0 not checked. [2020-07-21 16:00:08,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:09,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:09,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:09,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:09,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:09,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:11,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 271 proven. 465 refuted. 0 times theorem prover too weak. 981 trivial. 0 not checked. [2020-07-21 16:00:11,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [163259828] [2020-07-21 16:00:11,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:11,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:00:11,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269785257] [2020-07-21 16:00:11,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:00:11,082 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:11,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:00:11,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:00:11,083 INFO L87 Difference]: Start difference. First operand 246 states and 438 transitions. Second operand 25 states. [2020-07-21 16:00:12,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:12,152 INFO L93 Difference]: Finished difference Result 617 states and 1204 transitions. [2020-07-21 16:00:12,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:00:12,153 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 253 [2020-07-21 16:00:12,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:12,157 INFO L225 Difference]: With dead ends: 617 [2020-07-21 16:00:12,157 INFO L226 Difference]: Without dead ends: 319 [2020-07-21 16:00:12,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 463 SyntacticMatches, 19 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=308, Invalid=1498, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 16:00:12,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2020-07-21 16:00:12,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 268. [2020-07-21 16:00:12,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-21 16:00:12,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 468 transitions. [2020-07-21 16:00:12,189 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 468 transitions. Word has length 253 [2020-07-21 16:00:12,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:12,190 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 468 transitions. [2020-07-21 16:00:12,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:00:12,191 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 468 transitions. [2020-07-21 16:00:12,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2020-07-21 16:00:12,196 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:12,197 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:12,410 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:12,411 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:12,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:12,411 INFO L82 PathProgramCache]: Analyzing trace with hash -1624980115, now seen corresponding path program 5 times [2020-07-21 16:00:12,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:12,411 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116235376] [2020-07-21 16:00:12,412 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:12,630 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:12,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:12,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:00:12,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:12,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1044 backedges. 271 proven. 208 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2020-07-21 16:00:12,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:13,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:13,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:13,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:13,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,566 INFO L134 CoverageAnalysis]: Checked inductivity of 1044 backedges. 273 proven. 215 refuted. 0 times theorem prover too weak. 556 trivial. 0 not checked. [2020-07-21 16:00:14,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116235376] [2020-07-21 16:00:14,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:14,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:00:14,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228165555] [2020-07-21 16:00:14,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:00:14,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:14,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:00:14,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:00:14,569 INFO L87 Difference]: Start difference. First operand 268 states and 468 transitions. Second operand 23 states. [2020-07-21 16:00:15,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:15,363 INFO L93 Difference]: Finished difference Result 614 states and 1124 transitions. [2020-07-21 16:00:15,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 16:00:15,366 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 198 [2020-07-21 16:00:15,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:15,370 INFO L225 Difference]: With dead ends: 614 [2020-07-21 16:00:15,370 INFO L226 Difference]: Without dead ends: 333 [2020-07-21 16:00:15,374 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 358 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=220, Invalid=1112, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:00:15,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-21 16:00:15,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 288. [2020-07-21 16:00:15,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 16:00:15,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 495 transitions. [2020-07-21 16:00:15,394 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 495 transitions. Word has length 198 [2020-07-21 16:00:15,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:15,395 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 495 transitions. [2020-07-21 16:00:15,395 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:00:15,395 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 495 transitions. [2020-07-21 16:00:15,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2020-07-21 16:00:15,399 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:15,399 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:15,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:15,614 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:15,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:15,614 INFO L82 PathProgramCache]: Analyzing trace with hash 920981290, now seen corresponding path program 6 times [2020-07-21 16:00:15,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:15,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [512295074] [2020-07-21 16:00:15,614 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:15,795 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:15,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:15,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:15,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:15,875 INFO L134 CoverageAnalysis]: Checked inductivity of 622 backedges. 44 proven. 206 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2020-07-21 16:00:15,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:16,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,399 INFO L134 CoverageAnalysis]: Checked inductivity of 622 backedges. 44 proven. 220 refuted. 0 times theorem prover too weak. 358 trivial. 0 not checked. [2020-07-21 16:00:17,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [512295074] [2020-07-21 16:00:17,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:17,400 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:00:17,400 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705465087] [2020-07-21 16:00:17,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:00:17,401 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:17,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:00:17,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:17,401 INFO L87 Difference]: Start difference. First operand 288 states and 495 transitions. Second operand 18 states. [2020-07-21 16:00:17,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:17,671 INFO L93 Difference]: Finished difference Result 313 states and 534 transitions. [2020-07-21 16:00:17,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:00:17,675 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 157 [2020-07-21 16:00:17,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:17,678 INFO L225 Difference]: With dead ends: 313 [2020-07-21 16:00:17,679 INFO L226 Difference]: Without dead ends: 309 [2020-07-21 16:00:17,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 286 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:00:17,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2020-07-21 16:00:17,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 290. [2020-07-21 16:00:17,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2020-07-21 16:00:17,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 488 transitions. [2020-07-21 16:00:17,709 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 488 transitions. Word has length 157 [2020-07-21 16:00:17,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:17,710 INFO L479 AbstractCegarLoop]: Abstraction has 290 states and 488 transitions. [2020-07-21 16:00:17,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:00:17,710 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 488 transitions. [2020-07-21 16:00:17,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 16:00:17,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:17,714 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:17,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:17,928 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:17,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:17,929 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 12 times [2020-07-21 16:00:17,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:17,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069291324] [2020-07-21 16:00:17,929 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:18,120 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:18,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:18,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:18,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:18,200 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 45 proven. 260 refuted. 0 times theorem prover too weak. 481 trivial. 0 not checked. [2020-07-21 16:00:18,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:19,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,834 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 45 proven. 276 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2020-07-21 16:00:19,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069291324] [2020-07-21 16:00:19,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:19,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:00:19,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722231028] [2020-07-21 16:00:19,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:00:19,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:19,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:00:19,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:19,837 INFO L87 Difference]: Start difference. First operand 290 states and 488 transitions. Second operand 18 states. [2020-07-21 16:00:20,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:20,097 INFO L93 Difference]: Finished difference Result 305 states and 507 transitions. [2020-07-21 16:00:20,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:00:20,098 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 177 [2020-07-21 16:00:20,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:20,102 INFO L225 Difference]: With dead ends: 305 [2020-07-21 16:00:20,103 INFO L226 Difference]: Without dead ends: 301 [2020-07-21 16:00:20,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 325 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:00:20,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2020-07-21 16:00:20,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 280. [2020-07-21 16:00:20,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-21 16:00:20,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 470 transitions. [2020-07-21 16:00:20,127 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 470 transitions. Word has length 177 [2020-07-21 16:00:20,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:20,127 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 470 transitions. [2020-07-21 16:00:20,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:00:20,128 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 470 transitions. [2020-07-21 16:00:20,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 16:00:20,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:20,132 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:20,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:20,347 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:20,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:20,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1803358882, now seen corresponding path program 13 times [2020-07-21 16:00:20,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:20,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554630810] [2020-07-21 16:00:20,348 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:20,557 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:20,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:20,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:20,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:20,630 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 79 proven. 212 refuted. 0 times theorem prover too weak. 627 trivial. 0 not checked. [2020-07-21 16:00:20,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:21,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:21,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:21,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:21,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:21,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:21,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:21,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:21,793 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 79 proven. 222 refuted. 0 times theorem prover too weak. 617 trivial. 0 not checked. [2020-07-21 16:00:21,793 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554630810] [2020-07-21 16:00:21,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:21,794 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:21,794 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016292963] [2020-07-21 16:00:21,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:21,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:21,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:21,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:21,795 INFO L87 Difference]: Start difference. First operand 280 states and 470 transitions. Second operand 16 states. [2020-07-21 16:00:22,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:22,034 INFO L93 Difference]: Finished difference Result 320 states and 551 transitions. [2020-07-21 16:00:22,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:22,035 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 189 [2020-07-21 16:00:22,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:22,041 INFO L225 Difference]: With dead ends: 320 [2020-07-21 16:00:22,041 INFO L226 Difference]: Without dead ends: 316 [2020-07-21 16:00:22,044 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 353 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:22,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2020-07-21 16:00:22,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 290. [2020-07-21 16:00:22,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2020-07-21 16:00:22,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 499 transitions. [2020-07-21 16:00:22,070 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 499 transitions. Word has length 189 [2020-07-21 16:00:22,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:22,072 INFO L479 AbstractCegarLoop]: Abstraction has 290 states and 499 transitions. [2020-07-21 16:00:22,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:22,072 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 499 transitions. [2020-07-21 16:00:22,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 16:00:22,077 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:22,077 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:22,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:22,291 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:22,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:22,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1711365749, now seen corresponding path program 14 times [2020-07-21 16:00:22,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:22,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057397195] [2020-07-21 16:00:22,292 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:22,516 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:22,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:22,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:22,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:22,604 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 200 refuted. 0 times theorem prover too weak. 731 trivial. 0 not checked. [2020-07-21 16:00:22,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:23,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,795 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 210 refuted. 0 times theorem prover too weak. 721 trivial. 0 not checked. [2020-07-21 16:00:23,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057397195] [2020-07-21 16:00:23,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:23,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:23,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137459019] [2020-07-21 16:00:23,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:23,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:23,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:23,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:23,797 INFO L87 Difference]: Start difference. First operand 290 states and 499 transitions. Second operand 16 states. [2020-07-21 16:00:24,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:24,022 INFO L93 Difference]: Finished difference Result 358 states and 697 transitions. [2020-07-21 16:00:24,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:24,025 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 201 [2020-07-21 16:00:24,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:24,028 INFO L225 Difference]: With dead ends: 358 [2020-07-21 16:00:24,029 INFO L226 Difference]: Without dead ends: 354 [2020-07-21 16:00:24,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 377 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:24,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2020-07-21 16:00:24,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 290. [2020-07-21 16:00:24,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2020-07-21 16:00:24,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 499 transitions. [2020-07-21 16:00:24,054 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 499 transitions. Word has length 201 [2020-07-21 16:00:24,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:24,054 INFO L479 AbstractCegarLoop]: Abstraction has 290 states and 499 transitions. [2020-07-21 16:00:24,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:24,054 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 499 transitions. [2020-07-21 16:00:24,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2020-07-21 16:00:24,059 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:24,059 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 19, 19, 13, 11, 11, 11, 11, 11, 11, 11, 11, 11, 9, 9, 9, 9, 9, 9, 9, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:24,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:24,274 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:24,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:24,274 INFO L82 PathProgramCache]: Analyzing trace with hash -435736749, now seen corresponding path program 15 times [2020-07-21 16:00:24,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:24,274 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006228946] [2020-07-21 16:00:24,274 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:24,522 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:24,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:24,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:24,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:24,643 INFO L134 CoverageAnalysis]: Checked inductivity of 2105 backedges. 1099 proven. 86 refuted. 0 times theorem prover too weak. 920 trivial. 0 not checked. [2020-07-21 16:00:24,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:25,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:25,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:26,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:26,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:26,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:26,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:26,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:26,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:26,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:26,637 INFO L134 CoverageAnalysis]: Checked inductivity of 2105 backedges. 166 proven. 498 refuted. 0 times theorem prover too weak. 1441 trivial. 0 not checked. [2020-07-21 16:00:26,637 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006228946] [2020-07-21 16:00:26,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:26,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:00:26,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485029184] [2020-07-21 16:00:26,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:26,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:26,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:26,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:26,639 INFO L87 Difference]: Start difference. First operand 290 states and 499 transitions. Second operand 19 states. [2020-07-21 16:00:27,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:27,144 INFO L93 Difference]: Finished difference Result 605 states and 1073 transitions. [2020-07-21 16:00:27,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:00:27,145 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 277 [2020-07-21 16:00:27,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:27,149 INFO L225 Difference]: With dead ends: 605 [2020-07-21 16:00:27,149 INFO L226 Difference]: Without dead ends: 305 [2020-07-21 16:00:27,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 564 GetRequests, 523 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=162, Invalid=708, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:00:27,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-21 16:00:27,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 278. [2020-07-21 16:00:27,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2020-07-21 16:00:27,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 467 transitions. [2020-07-21 16:00:27,169 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 467 transitions. Word has length 277 [2020-07-21 16:00:27,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:27,169 INFO L479 AbstractCegarLoop]: Abstraction has 278 states and 467 transitions. [2020-07-21 16:00:27,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:27,169 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 467 transitions. [2020-07-21 16:00:27,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2020-07-21 16:00:27,173 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:27,173 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 17, 17, 12, 12, 11, 11, 11, 11, 11, 11, 11, 10, 8, 8, 8, 8, 8, 8, 8, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:27,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:27,388 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:27,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:27,388 INFO L82 PathProgramCache]: Analyzing trace with hash -2125050286, now seen corresponding path program 16 times [2020-07-21 16:00:27,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:27,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1998224002] [2020-07-21 16:00:27,388 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:27,621 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:27,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:27,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:00:27,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:27,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1911 backedges. 1012 proven. 247 refuted. 0 times theorem prover too weak. 652 trivial. 0 not checked. [2020-07-21 16:00:27,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:29,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:30,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1911 backedges. 233 proven. 490 refuted. 0 times theorem prover too weak. 1188 trivial. 0 not checked. [2020-07-21 16:00:30,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1998224002] [2020-07-21 16:00:30,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:30,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:00:30,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152471839] [2020-07-21 16:00:30,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:00:30,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:30,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:00:30,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:00:30,315 INFO L87 Difference]: Start difference. First operand 278 states and 467 transitions. Second operand 23 states. [2020-07-21 16:00:31,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:31,113 INFO L93 Difference]: Finished difference Result 607 states and 1115 transitions. [2020-07-21 16:00:31,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 16:00:31,114 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 263 [2020-07-21 16:00:31,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:31,117 INFO L225 Difference]: With dead ends: 607 [2020-07-21 16:00:31,117 INFO L226 Difference]: Without dead ends: 331 [2020-07-21 16:00:31,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 488 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=252, Invalid=1154, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 16:00:31,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2020-07-21 16:00:31,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 287. [2020-07-21 16:00:31,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2020-07-21 16:00:31,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 476 transitions. [2020-07-21 16:00:31,137 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 476 transitions. Word has length 263 [2020-07-21 16:00:31,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:31,138 INFO L479 AbstractCegarLoop]: Abstraction has 287 states and 476 transitions. [2020-07-21 16:00:31,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:00:31,138 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 476 transitions. [2020-07-21 16:00:31,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2020-07-21 16:00:31,141 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:31,141 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 10, 10, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:31,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:31,357 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:31,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:31,358 INFO L82 PathProgramCache]: Analyzing trace with hash 124404788, now seen corresponding path program 17 times [2020-07-21 16:00:31,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:31,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975960505] [2020-07-21 16:00:31,359 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:31,616 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:31,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:31,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:31,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:31,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 172 proven. 159 refuted. 0 times theorem prover too weak. 855 trivial. 0 not checked. [2020-07-21 16:00:31,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:32,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:33,019 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 174 proven. 167 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2020-07-21 16:00:33,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975960505] [2020-07-21 16:00:33,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:33,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:33,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097921027] [2020-07-21 16:00:33,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:33,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:33,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:33,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:33,021 INFO L87 Difference]: Start difference. First operand 287 states and 476 transitions. Second operand 16 states. [2020-07-21 16:00:33,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:33,260 INFO L93 Difference]: Finished difference Result 297 states and 490 transitions. [2020-07-21 16:00:33,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:33,261 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 213 [2020-07-21 16:00:33,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:33,265 INFO L225 Difference]: With dead ends: 297 [2020-07-21 16:00:33,265 INFO L226 Difference]: Without dead ends: 293 [2020-07-21 16:00:33,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 401 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:33,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2020-07-21 16:00:33,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 282. [2020-07-21 16:00:33,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2020-07-21 16:00:33,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 468 transitions. [2020-07-21 16:00:33,284 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 468 transitions. Word has length 213 [2020-07-21 16:00:33,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:33,285 INFO L479 AbstractCegarLoop]: Abstraction has 282 states and 468 transitions. [2020-07-21 16:00:33,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:33,285 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 468 transitions. [2020-07-21 16:00:33,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-21 16:00:33,290 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:33,290 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 29, 29, 21, 19, 18, 18, 18, 18, 18, 18, 18, 15, 14, 14, 14, 14, 14, 14, 14, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:33,503 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:33,504 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:33,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:33,504 INFO L82 PathProgramCache]: Analyzing trace with hash -1402669273, now seen corresponding path program 18 times [2020-07-21 16:00:33,504 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:33,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952623117] [2020-07-21 16:00:33,505 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:33,821 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:33,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:33,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:00:33,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:34,019 INFO L134 CoverageAnalysis]: Checked inductivity of 5501 backedges. 579 proven. 716 refuted. 0 times theorem prover too weak. 4206 trivial. 0 not checked. [2020-07-21 16:00:34,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:35,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,859 INFO L134 CoverageAnalysis]: Checked inductivity of 5501 backedges. 581 proven. 726 refuted. 0 times theorem prover too weak. 4194 trivial. 0 not checked. [2020-07-21 16:00:36,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952623117] [2020-07-21 16:00:36,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:36,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-21 16:00:36,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072414475] [2020-07-21 16:00:36,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:00:36,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:36,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:00:36,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:00:36,861 INFO L87 Difference]: Start difference. First operand 282 states and 468 transitions. Second operand 25 states. [2020-07-21 16:00:37,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:37,936 INFO L93 Difference]: Finished difference Result 737 states and 1383 transitions. [2020-07-21 16:00:37,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:00:37,938 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 437 [2020-07-21 16:00:37,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:37,945 INFO L225 Difference]: With dead ends: 737 [2020-07-21 16:00:37,945 INFO L226 Difference]: Without dead ends: 459 [2020-07-21 16:00:37,948 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 892 GetRequests, 835 SyntacticMatches, 15 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=320, Invalid=1572, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 16:00:37,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2020-07-21 16:00:37,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 389. [2020-07-21 16:00:37,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 389 states. [2020-07-21 16:00:37,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 734 transitions. [2020-07-21 16:00:37,978 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 734 transitions. Word has length 437 [2020-07-21 16:00:37,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:37,979 INFO L479 AbstractCegarLoop]: Abstraction has 389 states and 734 transitions. [2020-07-21 16:00:37,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:00:37,979 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 734 transitions. [2020-07-21 16:00:37,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2020-07-21 16:00:37,985 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:37,985 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 32, 32, 19, 18, 17, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:38,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:38,199 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:38,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:38,200 INFO L82 PathProgramCache]: Analyzing trace with hash -884746376, now seen corresponding path program 19 times [2020-07-21 16:00:38,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:38,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387197402] [2020-07-21 16:00:38,201 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:38,512 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:38,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:38,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 655 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:00:38,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:38,762 INFO L134 CoverageAnalysis]: Checked inductivity of 5695 backedges. 601 proven. 1104 refuted. 0 times theorem prover too weak. 3990 trivial. 0 not checked. [2020-07-21 16:00:38,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:40,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,222 INFO L134 CoverageAnalysis]: Checked inductivity of 5695 backedges. 601 proven. 1130 refuted. 0 times theorem prover too weak. 3964 trivial. 0 not checked. [2020-07-21 16:00:43,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387197402] [2020-07-21 16:00:43,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:43,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 31 [2020-07-21 16:00:43,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702259172] [2020-07-21 16:00:43,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:00:43,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:43,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:00:43,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:00:43,226 INFO L87 Difference]: Start difference. First operand 389 states and 734 transitions. Second operand 31 states. [2020-07-21 16:00:45,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:45,080 INFO L93 Difference]: Finished difference Result 885 states and 1969 transitions. [2020-07-21 16:00:45,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 16:00:45,082 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 445 [2020-07-21 16:00:45,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:45,088 INFO L225 Difference]: With dead ends: 885 [2020-07-21 16:00:45,089 INFO L226 Difference]: Without dead ends: 496 [2020-07-21 16:00:45,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 917 GetRequests, 839 SyntacticMatches, 21 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 678 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=525, Invalid=2897, Unknown=0, NotChecked=0, Total=3422 [2020-07-21 16:00:45,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-21 16:00:45,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 419. [2020-07-21 16:00:45,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 419 states. [2020-07-21 16:00:45,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 837 transitions. [2020-07-21 16:00:45,124 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 837 transitions. Word has length 445 [2020-07-21 16:00:45,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:45,125 INFO L479 AbstractCegarLoop]: Abstraction has 419 states and 837 transitions. [2020-07-21 16:00:45,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:00:45,125 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 837 transitions. [2020-07-21 16:00:45,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 16:00:45,129 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:45,129 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:45,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:45,343 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:45,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:45,344 INFO L82 PathProgramCache]: Analyzing trace with hash 120952594, now seen corresponding path program 20 times [2020-07-21 16:00:45,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:45,344 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [910814902] [2020-07-21 16:00:45,345 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:45,675 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:45,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:45,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:45,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:45,789 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 301 proven. 76 refuted. 0 times theorem prover too weak. 1125 trivial. 0 not checked. [2020-07-21 16:00:45,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:46,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 303 proven. 84 refuted. 0 times theorem prover too weak. 1115 trivial. 0 not checked. [2020-07-21 16:00:47,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [910814902] [2020-07-21 16:00:47,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:47,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:47,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63672871] [2020-07-21 16:00:47,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:47,251 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:47,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:47,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:47,251 INFO L87 Difference]: Start difference. First operand 419 states and 837 transitions. Second operand 16 states. [2020-07-21 16:00:47,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:47,489 INFO L93 Difference]: Finished difference Result 432 states and 857 transitions. [2020-07-21 16:00:47,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:47,489 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 237 [2020-07-21 16:00:47,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:47,494 INFO L225 Difference]: With dead ends: 432 [2020-07-21 16:00:47,495 INFO L226 Difference]: Without dead ends: 428 [2020-07-21 16:00:47,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 450 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:47,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2020-07-21 16:00:47,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 419. [2020-07-21 16:00:47,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 419 states. [2020-07-21 16:00:47,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 837 transitions. [2020-07-21 16:00:47,526 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 837 transitions. Word has length 237 [2020-07-21 16:00:47,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:47,527 INFO L479 AbstractCegarLoop]: Abstraction has 419 states and 837 transitions. [2020-07-21 16:00:47,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:47,527 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 837 transitions. [2020-07-21 16:00:47,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 533 [2020-07-21 16:00:47,533 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:47,534 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 37, 37, 26, 25, 21, 21, 21, 21, 21, 21, 21, 18, 18, 18, 18, 18, 18, 18, 16, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:47,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:47,749 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:47,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:47,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1878704702, now seen corresponding path program 21 times [2020-07-21 16:00:47,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:47,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424137959] [2020-07-21 16:00:47,750 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:48,131 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:48,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:48,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 788 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:00:48,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:48,501 INFO L134 CoverageAnalysis]: Checked inductivity of 8185 backedges. 4473 proven. 537 refuted. 0 times theorem prover too weak. 3175 trivial. 0 not checked. [2020-07-21 16:00:48,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:51,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:53,176 INFO L134 CoverageAnalysis]: Checked inductivity of 8185 backedges. 415 proven. 1650 refuted. 0 times theorem prover too weak. 6120 trivial. 0 not checked. [2020-07-21 16:00:53,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424137959] [2020-07-21 16:00:53,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:53,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 16:00:53,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348797308] [2020-07-21 16:00:53,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:00:53,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:53,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:00:53,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:00:53,179 INFO L87 Difference]: Start difference. First operand 419 states and 837 transitions. Second operand 27 states. [2020-07-21 16:00:54,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:54,605 INFO L93 Difference]: Finished difference Result 893 states and 1874 transitions. [2020-07-21 16:00:54,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 16:00:54,606 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 532 [2020-07-21 16:00:54,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:54,611 INFO L225 Difference]: With dead ends: 893 [2020-07-21 16:00:54,612 INFO L226 Difference]: Without dead ends: 479 [2020-07-21 16:00:54,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1086 GetRequests, 1017 SyntacticMatches, 21 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=408, Invalid=2042, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 16:00:54,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2020-07-21 16:00:54,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 430. [2020-07-21 16:00:54,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-07-21 16:00:54,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 871 transitions. [2020-07-21 16:00:54,648 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 871 transitions. Word has length 532 [2020-07-21 16:00:54,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:54,648 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 871 transitions. [2020-07-21 16:00:54,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:00:54,649 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 871 transitions. [2020-07-21 16:00:54,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2020-07-21 16:00:54,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:54,654 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 19, 19, 12, 12, 11, 11, 11, 11, 11, 11, 11, 10, 9, 9, 9, 9, 9, 9, 9, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:54,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:54,868 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:54,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:54,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1296147521, now seen corresponding path program 22 times [2020-07-21 16:00:54,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:54,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [921537795] [2020-07-21 16:00:54,870 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:55,192 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:55,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:55,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 410 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:55,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:55,348 INFO L134 CoverageAnalysis]: Checked inductivity of 2104 backedges. 844 proven. 32 refuted. 0 times theorem prover too weak. 1228 trivial. 0 not checked. [2020-07-21 16:00:55,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:56,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,230 INFO L134 CoverageAnalysis]: Checked inductivity of 2104 backedges. 144 proven. 490 refuted. 0 times theorem prover too weak. 1470 trivial. 0 not checked. [2020-07-21 16:00:57,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [921537795] [2020-07-21 16:00:57,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:57,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:57,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110298121] [2020-07-21 16:00:57,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:57,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:57,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:57,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:57,232 INFO L87 Difference]: Start difference. First operand 430 states and 871 transitions. Second operand 17 states. [2020-07-21 16:00:57,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:57,742 INFO L93 Difference]: Finished difference Result 871 states and 1904 transitions. [2020-07-21 16:00:57,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:00:57,743 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 277 [2020-07-21 16:00:57,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:57,748 INFO L225 Difference]: With dead ends: 871 [2020-07-21 16:00:57,748 INFO L226 Difference]: Without dead ends: 446 [2020-07-21 16:00:57,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 527 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:00:57,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2020-07-21 16:00:57,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 430. [2020-07-21 16:00:57,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-07-21 16:00:57,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 869 transitions. [2020-07-21 16:00:57,783 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 869 transitions. Word has length 277 [2020-07-21 16:00:57,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:57,783 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 869 transitions. [2020-07-21 16:00:57,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:57,784 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 869 transitions. [2020-07-21 16:00:57,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2020-07-21 16:00:57,788 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:57,789 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 19, 19, 14, 13, 12, 12, 12, 12, 12, 12, 12, 11, 9, 9, 9, 9, 9, 9, 9, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:58,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:58,003 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:58,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:58,004 INFO L82 PathProgramCache]: Analyzing trace with hash -1114542014, now seen corresponding path program 23 times [2020-07-21 16:00:58,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:58,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [131454182] [2020-07-21 16:00:58,005 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:00:58,339 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:58,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:58,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:00:58,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:58,615 INFO L134 CoverageAnalysis]: Checked inductivity of 2365 backedges. 1298 proven. 248 refuted. 0 times theorem prover too weak. 819 trivial. 0 not checked. [2020-07-21 16:00:58,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:00,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,360 INFO L134 CoverageAnalysis]: Checked inductivity of 2365 backedges. 316 proven. 536 refuted. 0 times theorem prover too weak. 1513 trivial. 0 not checked. [2020-07-21 16:01:01,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [131454182] [2020-07-21 16:01:01,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:01,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:01:01,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008885419] [2020-07-21 16:01:01,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:01:01,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:01,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:01:01,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:01,362 INFO L87 Difference]: Start difference. First operand 430 states and 869 transitions. Second operand 23 states. [2020-07-21 16:01:02,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:02,315 INFO L93 Difference]: Finished difference Result 899 states and 1823 transitions. [2020-07-21 16:01:02,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 16:01:02,316 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 292 [2020-07-21 16:01:02,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:02,320 INFO L225 Difference]: With dead ends: 899 [2020-07-21 16:01:02,321 INFO L226 Difference]: Without dead ends: 461 [2020-07-21 16:01:02,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 597 GetRequests, 545 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=220, Invalid=1112, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:01:02,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2020-07-21 16:01:02,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 418. [2020-07-21 16:01:02,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 418 states. [2020-07-21 16:01:02,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 832 transitions. [2020-07-21 16:01:02,354 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 832 transitions. Word has length 292 [2020-07-21 16:01:02,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:02,355 INFO L479 AbstractCegarLoop]: Abstraction has 418 states and 832 transitions. [2020-07-21 16:01:02,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:01:02,355 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 832 transitions. [2020-07-21 16:01:02,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 374 [2020-07-21 16:01:02,360 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:02,361 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 25, 25, 18, 18, 15, 15, 15, 15, 15, 15, 15, 12, 12, 12, 12, 12, 12, 12, 12, 7, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:02,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:02,576 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:02,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:02,576 INFO L82 PathProgramCache]: Analyzing trace with hash 130659488, now seen corresponding path program 24 times [2020-07-21 16:01:02,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:02,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1445348369] [2020-07-21 16:01:02,576 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:01:02,939 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:02,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:02,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:01:02,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:03,152 INFO L134 CoverageAnalysis]: Checked inductivity of 3930 backedges. 2061 proven. 424 refuted. 0 times theorem prover too weak. 1445 trivial. 0 not checked. [2020-07-21 16:01:03,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:05,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,771 INFO L134 CoverageAnalysis]: Checked inductivity of 3930 backedges. 397 proven. 862 refuted. 0 times theorem prover too weak. 2671 trivial. 0 not checked. [2020-07-21 16:01:06,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1445348369] [2020-07-21 16:01:06,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:06,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:01:06,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423873176] [2020-07-21 16:01:06,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:01:06,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:06,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:01:06,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:01:06,774 INFO L87 Difference]: Start difference. First operand 418 states and 832 transitions. Second operand 25 states. [2020-07-21 16:01:08,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:08,137 INFO L93 Difference]: Finished difference Result 988 states and 2055 transitions. [2020-07-21 16:01:08,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 16:01:08,143 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 373 [2020-07-21 16:01:08,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:08,150 INFO L225 Difference]: With dead ends: 988 [2020-07-21 16:01:08,151 INFO L226 Difference]: Without dead ends: 522 [2020-07-21 16:01:08,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 765 GetRequests, 703 SyntacticMatches, 19 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=334, Invalid=1646, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 16:01:08,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-21 16:01:08,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 444. [2020-07-21 16:01:08,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 444 states. [2020-07-21 16:01:08,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 900 transitions. [2020-07-21 16:01:08,186 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 900 transitions. Word has length 373 [2020-07-21 16:01:08,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:08,187 INFO L479 AbstractCegarLoop]: Abstraction has 444 states and 900 transitions. [2020-07-21 16:01:08,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:01:08,187 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 900 transitions. [2020-07-21 16:01:08,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-21 16:01:08,192 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:08,193 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 13, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:08,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:08,407 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:08,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:08,407 INFO L82 PathProgramCache]: Analyzing trace with hash -432569092, now seen corresponding path program 25 times [2020-07-21 16:01:08,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:08,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826512032] [2020-07-21 16:01:08,409 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:01:08,796 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:08,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:08,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:01:08,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:09,118 INFO L134 CoverageAnalysis]: Checked inductivity of 2297 backedges. 348 proven. 569 refuted. 0 times theorem prover too weak. 1380 trivial. 0 not checked. [2020-07-21 16:01:09,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:10,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,688 INFO L134 CoverageAnalysis]: Checked inductivity of 2297 backedges. 348 proven. 588 refuted. 0 times theorem prover too weak. 1361 trivial. 0 not checked. [2020-07-21 16:01:12,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826512032] [2020-07-21 16:01:12,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:12,689 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 16:01:12,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433211038] [2020-07-21 16:01:12,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:01:12,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:12,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:01:12,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:01:12,691 INFO L87 Difference]: Start difference. First operand 444 states and 900 transitions. Second operand 27 states. [2020-07-21 16:01:14,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:14,085 INFO L93 Difference]: Finished difference Result 903 states and 1879 transitions. [2020-07-21 16:01:14,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 16:01:14,086 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 289 [2020-07-21 16:01:14,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:14,093 INFO L225 Difference]: With dead ends: 903 [2020-07-21 16:01:14,093 INFO L226 Difference]: Without dead ends: 449 [2020-07-21 16:01:14,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 599 GetRequests, 531 SyntacticMatches, 21 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=384, Invalid=1968, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 16:01:14,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2020-07-21 16:01:14,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 364. [2020-07-21 16:01:14,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-21 16:01:14,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 671 transitions. [2020-07-21 16:01:14,118 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 671 transitions. Word has length 289 [2020-07-21 16:01:14,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:14,118 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 671 transitions. [2020-07-21 16:01:14,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:01:14,118 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 671 transitions. [2020-07-21 16:01:14,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 16:01:14,120 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:14,121 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 15, 15, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:14,321 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:14,322 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:14,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:14,322 INFO L82 PathProgramCache]: Analyzing trace with hash 638865236, now seen corresponding path program 5 times [2020-07-21 16:01:14,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:14,323 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [338428627] [2020-07-21 16:01:14,324 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:01:14,717 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:14,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:14,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:01:14,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:14,798 INFO L134 CoverageAnalysis]: Checked inductivity of 1534 backedges. 161 proven. 152 refuted. 0 times theorem prover too weak. 1221 trivial. 0 not checked. [2020-07-21 16:01:14,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:15,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1534 backedges. 161 proven. 157 refuted. 0 times theorem prover too weak. 1216 trivial. 0 not checked. [2020-07-21 16:01:16,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [338428627] [2020-07-21 16:01:16,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:16,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:01:16,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884499316] [2020-07-21 16:01:16,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:01:16,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:16,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:01:16,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:01:16,011 INFO L87 Difference]: Start difference. First operand 364 states and 671 transitions. Second operand 14 states. [2020-07-21 16:01:16,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:16,222 INFO L93 Difference]: Finished difference Result 412 states and 797 transitions. [2020-07-21 16:01:16,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:01:16,224 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 237 [2020-07-21 16:01:16,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:16,229 INFO L225 Difference]: With dead ends: 412 [2020-07-21 16:01:16,230 INFO L226 Difference]: Without dead ends: 408 [2020-07-21 16:01:16,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 454 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:01:16,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-21 16:01:16,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 364. [2020-07-21 16:01:16,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-21 16:01:16,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 671 transitions. [2020-07-21 16:01:16,257 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 671 transitions. Word has length 237 [2020-07-21 16:01:16,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:16,258 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 671 transitions. [2020-07-21 16:01:16,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:01:16,258 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 671 transitions. [2020-07-21 16:01:16,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-21 16:01:16,261 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:16,261 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 17, 17, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:16,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:16,472 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:16,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:16,472 INFO L82 PathProgramCache]: Analyzing trace with hash -1057498309, now seen corresponding path program 6 times [2020-07-21 16:01:16,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:16,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [110419110] [2020-07-21 16:01:16,473 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:01:16,903 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:16,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:16,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:16,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:17,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1686 backedges. 86 proven. 445 refuted. 0 times theorem prover too weak. 1155 trivial. 0 not checked. [2020-07-21 16:01:17,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:18,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:19,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:19,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:19,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:19,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:19,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:19,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:19,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:19,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1686 backedges. 86 proven. 466 refuted. 0 times theorem prover too weak. 1134 trivial. 0 not checked. [2020-07-21 16:01:19,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [110419110] [2020-07-21 16:01:19,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:19,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:01:19,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286190156] [2020-07-21 16:01:19,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:01:19,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:19,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:01:19,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:01:19,997 INFO L87 Difference]: Start difference. First operand 364 states and 671 transitions. Second operand 20 states. [2020-07-21 16:01:20,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:20,366 INFO L93 Difference]: Finished difference Result 368 states and 674 transitions. [2020-07-21 16:01:20,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:01:20,367 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 249 [2020-07-21 16:01:20,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:20,371 INFO L225 Difference]: With dead ends: 368 [2020-07-21 16:01:20,371 INFO L226 Difference]: Without dead ends: 364 [2020-07-21 16:01:20,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 466 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:01:20,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2020-07-21 16:01:20,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 351. [2020-07-21 16:01:20,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-07-21 16:01:20,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 638 transitions. [2020-07-21 16:01:20,392 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 638 transitions. Word has length 249 [2020-07-21 16:01:20,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:20,393 INFO L479 AbstractCegarLoop]: Abstraction has 351 states and 638 transitions. [2020-07-21 16:01:20,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:01:20,393 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 638 transitions. [2020-07-21 16:01:20,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 475 [2020-07-21 16:01:20,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:20,398 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 33, 33, 21, 20, 19, 19, 19, 19, 19, 19, 19, 18, 16, 16, 16, 16, 16, 16, 16, 12, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:20,598 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:20,599 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:20,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:20,600 INFO L82 PathProgramCache]: Analyzing trace with hash -207122258, now seen corresponding path program 26 times [2020-07-21 16:01:20,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:20,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1129483928] [2020-07-21 16:01:20,601 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:01:21,086 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:21,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:21,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 700 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:01:21,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:21,427 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 687 proven. 1295 refuted. 0 times theorem prover too weak. 4506 trivial. 0 not checked. [2020-07-21 16:01:21,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:23,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,108 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 687 proven. 1327 refuted. 0 times theorem prover too weak. 4474 trivial. 0 not checked. [2020-07-21 16:01:27,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1129483928] [2020-07-21 16:01:27,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:27,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 16:01:27,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770770962] [2020-07-21 16:01:27,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:01:27,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:27,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:01:27,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:01:27,110 INFO L87 Difference]: Start difference. First operand 351 states and 638 transitions. Second operand 31 states. [2020-07-21 16:01:29,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:29,410 INFO L93 Difference]: Finished difference Result 751 states and 1488 transitions. [2020-07-21 16:01:29,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 16:01:29,411 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 474 [2020-07-21 16:01:29,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:29,416 INFO L225 Difference]: With dead ends: 751 [2020-07-21 16:01:29,416 INFO L226 Difference]: Without dead ends: 405 [2020-07-21 16:01:29,420 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 894 SyntacticMatches, 25 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 753 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=554, Invalid=2986, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 16:01:29,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2020-07-21 16:01:29,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 374. [2020-07-21 16:01:29,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 374 states. [2020-07-21 16:01:29,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 712 transitions. [2020-07-21 16:01:29,440 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 712 transitions. Word has length 474 [2020-07-21 16:01:29,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:29,441 INFO L479 AbstractCegarLoop]: Abstraction has 374 states and 712 transitions. [2020-07-21 16:01:29,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:01:29,441 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 712 transitions. [2020-07-21 16:01:29,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 463 [2020-07-21 16:01:29,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:29,446 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 21, 20, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 16, 12, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:29,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:29,647 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:29,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:29,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1197228147, now seen corresponding path program 27 times [2020-07-21 16:01:29,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:29,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [421596379] [2020-07-21 16:01:29,649 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:01:30,129 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:30,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:30,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 684 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:01:30,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:30,379 INFO L134 CoverageAnalysis]: Checked inductivity of 6124 backedges. 712 proven. 951 refuted. 0 times theorem prover too weak. 4461 trivial. 0 not checked. [2020-07-21 16:01:30,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:32,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,808 INFO L134 CoverageAnalysis]: Checked inductivity of 6124 backedges. 712 proven. 971 refuted. 0 times theorem prover too weak. 4441 trivial. 0 not checked. [2020-07-21 16:01:34,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [421596379] [2020-07-21 16:01:34,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:34,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 16:01:34,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370232566] [2020-07-21 16:01:34,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:01:34,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:34,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:01:34,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:01:34,811 INFO L87 Difference]: Start difference. First operand 374 states and 712 transitions. Second operand 27 states. [2020-07-21 16:01:36,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:36,523 INFO L93 Difference]: Finished difference Result 862 states and 1805 transitions. [2020-07-21 16:01:36,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 16:01:36,528 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 462 [2020-07-21 16:01:36,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:36,535 INFO L225 Difference]: With dead ends: 862 [2020-07-21 16:01:36,536 INFO L226 Difference]: Without dead ends: 477 [2020-07-21 16:01:36,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 949 GetRequests, 877 SyntacticMatches, 21 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 540 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=460, Invalid=2296, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 16:01:36,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2020-07-21 16:01:36,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 401. [2020-07-21 16:01:36,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 401 states. [2020-07-21 16:01:36,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 790 transitions. [2020-07-21 16:01:36,570 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 790 transitions. Word has length 462 [2020-07-21 16:01:36,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:36,570 INFO L479 AbstractCegarLoop]: Abstraction has 401 states and 790 transitions. [2020-07-21 16:01:36,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:01:36,570 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 790 transitions. [2020-07-21 16:01:36,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2020-07-21 16:01:36,574 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:36,574 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 20, 20, 17, 15, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 7, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:36,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:36,789 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:36,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:36,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1136693034, now seen corresponding path program 28 times [2020-07-21 16:01:36,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:36,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029232981] [2020-07-21 16:01:36,790 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:01:37,263 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:37,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:37,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:01:37,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:37,515 INFO L134 CoverageAnalysis]: Checked inductivity of 2413 backedges. 413 proven. 619 refuted. 0 times theorem prover too weak. 1381 trivial. 0 not checked. [2020-07-21 16:01:37,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:39,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:39,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:39,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:39,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:42,054 INFO L134 CoverageAnalysis]: Checked inductivity of 2413 backedges. 413 proven. 643 refuted. 0 times theorem prover too weak. 1357 trivial. 0 not checked. [2020-07-21 16:01:42,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029232981] [2020-07-21 16:01:42,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:42,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 16:01:42,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869056721] [2020-07-21 16:01:42,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:01:42,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:42,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:01:42,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:01:42,056 INFO L87 Difference]: Start difference. First operand 401 states and 790 transitions. Second operand 29 states. [2020-07-21 16:01:43,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:43,742 INFO L93 Difference]: Finished difference Result 788 states and 1637 transitions. [2020-07-21 16:01:43,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 16:01:43,744 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 297 [2020-07-21 16:01:43,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:43,750 INFO L225 Difference]: With dead ends: 788 [2020-07-21 16:01:43,750 INFO L226 Difference]: Without dead ends: 384 [2020-07-21 16:01:43,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 543 SyntacticMatches, 23 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=373, Invalid=1979, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 16:01:43,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2020-07-21 16:01:43,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 270. [2020-07-21 16:01:43,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-21 16:01:43,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 429 transitions. [2020-07-21 16:01:43,780 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 429 transitions. Word has length 297 [2020-07-21 16:01:43,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:43,780 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 429 transitions. [2020-07-21 16:01:43,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:01:43,780 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 429 transitions. [2020-07-21 16:01:43,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-21 16:01:43,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:43,783 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 17, 16, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:43,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:43,998 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:43,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:43,998 INFO L82 PathProgramCache]: Analyzing trace with hash -93274365, now seen corresponding path program 29 times [2020-07-21 16:01:43,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:43,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171227625] [2020-07-21 16:01:43,999 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:01:44,547 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:44,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:44,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 691 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:44,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:44,812 INFO L134 CoverageAnalysis]: Checked inductivity of 2632 backedges. 99 proven. 619 refuted. 0 times theorem prover too weak. 1914 trivial. 0 not checked. [2020-07-21 16:01:44,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:47,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:48,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:48,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:48,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:48,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:48,479 INFO L134 CoverageAnalysis]: Checked inductivity of 2632 backedges. 99 proven. 643 refuted. 0 times theorem prover too weak. 1890 trivial. 0 not checked. [2020-07-21 16:01:48,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171227625] [2020-07-21 16:01:48,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:48,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:01:48,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625761362] [2020-07-21 16:01:48,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:01:48,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:48,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:01:48,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:01:48,481 INFO L87 Difference]: Start difference. First operand 270 states and 429 transitions. Second operand 20 states. [2020-07-21 16:01:48,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:48,909 INFO L93 Difference]: Finished difference Result 277 states and 439 transitions. [2020-07-21 16:01:48,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:01:48,911 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 310 [2020-07-21 16:01:48,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:48,914 INFO L225 Difference]: With dead ends: 277 [2020-07-21 16:01:48,914 INFO L226 Difference]: Without dead ends: 273 [2020-07-21 16:01:48,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 587 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:01:48,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-21 16:01:48,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 273. [2020-07-21 16:01:48,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2020-07-21 16:01:48,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 435 transitions. [2020-07-21 16:01:48,931 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 435 transitions. Word has length 310 [2020-07-21 16:01:48,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:48,932 INFO L479 AbstractCegarLoop]: Abstraction has 273 states and 435 transitions. [2020-07-21 16:01:48,932 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:01:48,932 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 435 transitions. [2020-07-21 16:01:48,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-21 16:01:48,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:48,934 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 17, 16, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:49,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:49,135 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:49,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:49,136 INFO L82 PathProgramCache]: Analyzing trace with hash -1104650920, now seen corresponding path program 30 times [2020-07-21 16:01:49,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:49,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1469452813] [2020-07-21 16:01:49,137 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:01:49,656 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:49,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:49,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:49,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:49,780 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 133 proven. 465 refuted. 0 times theorem prover too weak. 1822 trivial. 0 not checked. [2020-07-21 16:01:49,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:51,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:52,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:52,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:52,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:52,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:52,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:52,484 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 133 proven. 481 refuted. 0 times theorem prover too weak. 1806 trivial. 0 not checked. [2020-07-21 16:01:52,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1469452813] [2020-07-21 16:01:52,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:52,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:01:52,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655748491] [2020-07-21 16:01:52,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:01:52,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:52,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:01:52,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:01:52,486 INFO L87 Difference]: Start difference. First operand 273 states and 435 transitions. Second operand 18 states. [2020-07-21 16:01:52,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:52,841 INFO L93 Difference]: Finished difference Result 305 states and 502 transitions. [2020-07-21 16:01:52,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:01:52,842 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 298 [2020-07-21 16:01:52,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:52,846 INFO L225 Difference]: With dead ends: 305 [2020-07-21 16:01:52,846 INFO L226 Difference]: Without dead ends: 301 [2020-07-21 16:01:52,846 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 567 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:01:52,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2020-07-21 16:01:52,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 273. [2020-07-21 16:01:52,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2020-07-21 16:01:52,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 435 transitions. [2020-07-21 16:01:52,860 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 435 transitions. Word has length 298 [2020-07-21 16:01:52,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:52,860 INFO L479 AbstractCegarLoop]: Abstraction has 273 states and 435 transitions. [2020-07-21 16:01:52,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:01:52,861 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 435 transitions. [2020-07-21 16:01:52,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 364 [2020-07-21 16:01:52,864 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:52,864 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 25, 25, 19, 19, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 9, 7, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:53,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:53,070 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:53,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:53,071 INFO L82 PathProgramCache]: Analyzing trace with hash -706808307, now seen corresponding path program 31 times [2020-07-21 16:01:53,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:53,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931003091] [2020-07-21 16:01:53,072 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:01:53,595 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:53,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:53,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:01:53,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:53,831 INFO L134 CoverageAnalysis]: Checked inductivity of 3682 backedges. 1912 proven. 340 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2020-07-21 16:01:53,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:56,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:56,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:56,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:56,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:56,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:56,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:57,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:57,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:57,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:57,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:57,426 INFO L134 CoverageAnalysis]: Checked inductivity of 3682 backedges. 428 proven. 688 refuted. 0 times theorem prover too weak. 2566 trivial. 0 not checked. [2020-07-21 16:01:57,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931003091] [2020-07-21 16:01:57,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:57,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:01:57,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856802493] [2020-07-21 16:01:57,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:01:57,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:57,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:01:57,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:57,428 INFO L87 Difference]: Start difference. First operand 273 states and 435 transitions. Second operand 23 states. [2020-07-21 16:01:58,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:58,620 INFO L93 Difference]: Finished difference Result 703 states and 1249 transitions. [2020-07-21 16:01:58,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 16:01:58,621 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 363 [2020-07-21 16:01:58,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:58,628 INFO L225 Difference]: With dead ends: 703 [2020-07-21 16:01:58,628 INFO L226 Difference]: Without dead ends: 413 [2020-07-21 16:01:58,630 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 742 GetRequests, 687 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=277, Invalid=1283, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:01:58,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2020-07-21 16:01:58,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 288. [2020-07-21 16:01:58,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 16:01:58,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 471 transitions. [2020-07-21 16:01:58,655 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 471 transitions. Word has length 363 [2020-07-21 16:01:58,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:58,656 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 471 transitions. [2020-07-21 16:01:58,656 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:01:58,656 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 471 transitions. [2020-07-21 16:01:58,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2020-07-21 16:01:58,660 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:58,661 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 21, 20, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 10, 10, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:58,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:58,875 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:58,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:58,875 INFO L82 PathProgramCache]: Analyzing trace with hash 22025187, now seen corresponding path program 32 times [2020-07-21 16:01:58,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:58,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [971379044] [2020-07-21 16:01:58,876 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:01:59,445 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:59,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:59,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 614 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:01:59,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:59,765 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 688 proven. 766 refuted. 0 times theorem prover too weak. 3386 trivial. 0 not checked. [2020-07-21 16:01:59,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:01,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:01,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:02,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:02,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:02,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:02,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,487 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 688 proven. 786 refuted. 0 times theorem prover too weak. 3366 trivial. 0 not checked. [2020-07-21 16:02:04,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [971379044] [2020-07-21 16:02:04,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:04,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 16:02:04,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546279540] [2020-07-21 16:02:04,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:02:04,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:04,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:02:04,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:02:04,489 INFO L87 Difference]: Start difference. First operand 288 states and 471 transitions. Second operand 27 states. [2020-07-21 16:02:06,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:06,344 INFO L93 Difference]: Finished difference Result 715 states and 1268 transitions. [2020-07-21 16:02:06,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 16:02:06,345 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 414 [2020-07-21 16:02:06,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:06,351 INFO L225 Difference]: With dead ends: 715 [2020-07-21 16:02:06,351 INFO L226 Difference]: Without dead ends: 411 [2020-07-21 16:02:06,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 781 SyntacticMatches, 21 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=460, Invalid=2296, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 16:02:06,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2020-07-21 16:02:06,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 293. [2020-07-21 16:02:06,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 293 states. [2020-07-21 16:02:06,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 483 transitions. [2020-07-21 16:02:06,377 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 483 transitions. Word has length 414 [2020-07-21 16:02:06,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:06,378 INFO L479 AbstractCegarLoop]: Abstraction has 293 states and 483 transitions. [2020-07-21 16:02:06,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:02:06,378 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 483 transitions. [2020-07-21 16:02:06,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-21 16:02:06,381 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:06,381 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 22, 22, 17, 16, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 8, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:06,595 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:06,596 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:06,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:06,597 INFO L82 PathProgramCache]: Analyzing trace with hash 1577007480, now seen corresponding path program 33 times [2020-07-21 16:02:06,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:06,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013082029] [2020-07-21 16:02:06,598 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:02:07,164 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:07,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:07,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:02:07,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:07,307 INFO L134 CoverageAnalysis]: Checked inductivity of 2864 backedges. 180 proven. 470 refuted. 0 times theorem prover too weak. 2214 trivial. 0 not checked. [2020-07-21 16:02:07,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:09,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:10,323 INFO L134 CoverageAnalysis]: Checked inductivity of 2864 backedges. 180 proven. 486 refuted. 0 times theorem prover too weak. 2198 trivial. 0 not checked. [2020-07-21 16:02:10,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013082029] [2020-07-21 16:02:10,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:10,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:02:10,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394415247] [2020-07-21 16:02:10,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:02:10,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:10,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:02:10,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:02:10,325 INFO L87 Difference]: Start difference. First operand 293 states and 483 transitions. Second operand 18 states. [2020-07-21 16:02:10,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:10,627 INFO L93 Difference]: Finished difference Result 335 states and 575 transitions. [2020-07-21 16:02:10,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:02:10,628 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 322 [2020-07-21 16:02:10,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:10,632 INFO L225 Difference]: With dead ends: 335 [2020-07-21 16:02:10,632 INFO L226 Difference]: Without dead ends: 331 [2020-07-21 16:02:10,633 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 615 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:02:10,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2020-07-21 16:02:10,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 278. [2020-07-21 16:02:10,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2020-07-21 16:02:10,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 448 transitions. [2020-07-21 16:02:10,646 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 448 transitions. Word has length 322 [2020-07-21 16:02:10,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:10,646 INFO L479 AbstractCegarLoop]: Abstraction has 278 states and 448 transitions. [2020-07-21 16:02:10,646 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:02:10,646 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 448 transitions. [2020-07-21 16:02:10,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2020-07-21 16:02:10,650 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:10,650 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 19, 19, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 9, 8, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:10,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:10,851 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:10,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:10,851 INFO L82 PathProgramCache]: Analyzing trace with hash 559783750, now seen corresponding path program 34 times [2020-07-21 16:02:10,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:10,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924479033] [2020-07-21 16:02:10,852 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:02:11,417 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:11,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:11,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 561 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:02:11,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:11,683 INFO L134 CoverageAnalysis]: Checked inductivity of 3934 backedges. 2215 proven. 290 refuted. 0 times theorem prover too weak. 1429 trivial. 0 not checked. [2020-07-21 16:02:11,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:14,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:14,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:14,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:15,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:16,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:16,410 INFO L134 CoverageAnalysis]: Checked inductivity of 3934 backedges. 535 proven. 735 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 16:02:16,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924479033] [2020-07-21 16:02:16,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:16,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:02:16,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858891475] [2020-07-21 16:02:16,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:02:16,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:16,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:02:16,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:02:16,412 INFO L87 Difference]: Start difference. First operand 278 states and 448 transitions. Second operand 25 states. [2020-07-21 16:02:18,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:18,146 INFO L93 Difference]: Finished difference Result 672 states and 1132 transitions. [2020-07-21 16:02:18,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 16:02:18,148 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 375 [2020-07-21 16:02:18,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:18,153 INFO L225 Difference]: With dead ends: 672 [2020-07-21 16:02:18,153 INFO L226 Difference]: Without dead ends: 357 [2020-07-21 16:02:18,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 770 GetRequests, 707 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=340, Invalid=1730, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 16:02:18,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2020-07-21 16:02:18,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 292. [2020-07-21 16:02:18,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2020-07-21 16:02:18,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 481 transitions. [2020-07-21 16:02:18,169 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 481 transitions. Word has length 375 [2020-07-21 16:02:18,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:18,169 INFO L479 AbstractCegarLoop]: Abstraction has 292 states and 481 transitions. [2020-07-21 16:02:18,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:02:18,169 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 481 transitions. [2020-07-21 16:02:18,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-21 16:02:18,172 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:18,172 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 22, 22, 17, 16, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 11, 11, 11, 11, 10, 6, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:18,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:18,373 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:18,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:18,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1226533921, now seen corresponding path program 35 times [2020-07-21 16:02:18,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:18,374 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1860298005] [2020-07-21 16:02:18,375 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:02:18,968 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:18,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:18,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 745 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:02:18,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:19,107 INFO L134 CoverageAnalysis]: Checked inductivity of 3116 backedges. 229 proven. 351 refuted. 0 times theorem prover too weak. 2536 trivial. 0 not checked. [2020-07-21 16:02:19,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:20,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,754 INFO L134 CoverageAnalysis]: Checked inductivity of 3116 backedges. 229 proven. 361 refuted. 0 times theorem prover too weak. 2526 trivial. 0 not checked. [2020-07-21 16:02:21,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1860298005] [2020-07-21 16:02:21,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:21,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:02:21,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397156611] [2020-07-21 16:02:21,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:02:21,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:21,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:02:21,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:02:21,756 INFO L87 Difference]: Start difference. First operand 292 states and 481 transitions. Second operand 16 states. [2020-07-21 16:02:22,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:22,106 INFO L93 Difference]: Finished difference Result 345 states and 625 transitions. [2020-07-21 16:02:22,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:02:22,109 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 334 [2020-07-21 16:02:22,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:22,113 INFO L225 Difference]: With dead ends: 345 [2020-07-21 16:02:22,113 INFO L226 Difference]: Without dead ends: 341 [2020-07-21 16:02:22,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 643 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:02:22,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2020-07-21 16:02:22,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 313. [2020-07-21 16:02:22,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 313 states. [2020-07-21 16:02:22,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 551 transitions. [2020-07-21 16:02:22,130 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 551 transitions. Word has length 334 [2020-07-21 16:02:22,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:22,131 INFO L479 AbstractCegarLoop]: Abstraction has 313 states and 551 transitions. [2020-07-21 16:02:22,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:02:22,131 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 551 transitions. [2020-07-21 16:02:22,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 516 [2020-07-21 16:02:22,134 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:22,134 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 23, 23, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 16, 15, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:22,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:22,335 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:22,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:22,336 INFO L82 PathProgramCache]: Analyzing trace with hash 24060687, now seen corresponding path program 36 times [2020-07-21 16:02:22,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:22,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705688114] [2020-07-21 16:02:22,337 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:02:22,962 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:22,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:22,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:02:22,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:23,327 INFO L134 CoverageAnalysis]: Checked inductivity of 7650 backedges. 4228 proven. 625 refuted. 0 times theorem prover too weak. 2797 trivial. 0 not checked. [2020-07-21 16:02:23,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:27,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:27,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:28,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:29,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:29,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,924 INFO L134 CoverageAnalysis]: Checked inductivity of 7650 backedges. 502 proven. 1654 refuted. 0 times theorem prover too weak. 5494 trivial. 0 not checked. [2020-07-21 16:02:30,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705688114] [2020-07-21 16:02:30,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:30,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 16:02:30,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054394171] [2020-07-21 16:02:30,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:02:30,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:30,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:02:30,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:02:30,926 INFO L87 Difference]: Start difference. First operand 313 states and 551 transitions. Second operand 29 states. [2020-07-21 16:02:32,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:32,735 INFO L93 Difference]: Finished difference Result 709 states and 1331 transitions. [2020-07-21 16:02:32,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-21 16:02:32,736 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 515 [2020-07-21 16:02:32,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:32,741 INFO L225 Difference]: With dead ends: 709 [2020-07-21 16:02:32,741 INFO L226 Difference]: Without dead ends: 399 [2020-07-21 16:02:32,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1053 GetRequests, 979 SyntacticMatches, 23 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 546 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=443, Invalid=2313, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 16:02:32,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2020-07-21 16:02:32,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 287. [2020-07-21 16:02:32,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2020-07-21 16:02:32,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 472 transitions. [2020-07-21 16:02:32,757 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 472 transitions. Word has length 515 [2020-07-21 16:02:32,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:32,758 INFO L479 AbstractCegarLoop]: Abstraction has 287 states and 472 transitions. [2020-07-21 16:02:32,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:02:32,758 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 472 transitions. [2020-07-21 16:02:32,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 383 [2020-07-21 16:02:32,760 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:32,760 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 26, 26, 17, 16, 15, 15, 15, 15, 15, 15, 15, 14, 13, 13, 13, 13, 13, 13, 13, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:32,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:32,961 INFO L427 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:32,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:32,962 INFO L82 PathProgramCache]: Analyzing trace with hash -92665153, now seen corresponding path program 37 times [2020-07-21 16:02:32,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:32,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1091651458] [2020-07-21 16:02:32,963 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:02:33,622 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:33,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:33,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:02:33,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:33,764 INFO L134 CoverageAnalysis]: Checked inductivity of 4148 backedges. 341 proven. 329 refuted. 0 times theorem prover too weak. 3478 trivial. 0 not checked. [2020-07-21 16:02:33,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:35,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:35,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:35,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:35,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:37,070 INFO L134 CoverageAnalysis]: Checked inductivity of 4148 backedges. 341 proven. 341 refuted. 0 times theorem prover too weak. 3466 trivial. 0 not checked. [2020-07-21 16:02:37,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1091651458] [2020-07-21 16:02:37,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:37,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:02:37,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662140754] [2020-07-21 16:02:37,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:02:37,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:37,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:02:37,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:02:37,072 INFO L87 Difference]: Start difference. First operand 287 states and 472 transitions. Second operand 16 states. [2020-07-21 16:02:37,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:37,405 INFO L93 Difference]: Finished difference Result 324 states and 578 transitions. [2020-07-21 16:02:37,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:02:37,407 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 382 [2020-07-21 16:02:37,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:37,410 INFO L225 Difference]: With dead ends: 324 [2020-07-21 16:02:37,411 INFO L226 Difference]: Without dead ends: 320 [2020-07-21 16:02:37,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 768 GetRequests, 739 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:02:37,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2020-07-21 16:02:37,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 292. [2020-07-21 16:02:37,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2020-07-21 16:02:37,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 489 transitions. [2020-07-21 16:02:37,426 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 489 transitions. Word has length 382 [2020-07-21 16:02:37,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:37,426 INFO L479 AbstractCegarLoop]: Abstraction has 292 states and 489 transitions. [2020-07-21 16:02:37,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:02:37,427 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 489 transitions. [2020-07-21 16:02:37,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2020-07-21 16:02:37,429 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:37,429 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 17, 16, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 12, 10, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:37,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:37,632 INFO L427 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:37,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:37,632 INFO L82 PathProgramCache]: Analyzing trace with hash -2140252586, now seen corresponding path program 38 times [2020-07-21 16:02:37,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:37,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889273879] [2020-07-21 16:02:37,633 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:02:38,293 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:38,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:38,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:02:38,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:38,469 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 258 proven. 508 refuted. 0 times theorem prover too weak. 3082 trivial. 0 not checked. [2020-07-21 16:02:38,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:40,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:40,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:42,070 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 260 proven. 522 refuted. 0 times theorem prover too weak. 3066 trivial. 0 not checked. [2020-07-21 16:02:42,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889273879] [2020-07-21 16:02:42,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:42,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:02:42,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701221244] [2020-07-21 16:02:42,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:02:42,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:42,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:02:42,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:02:42,074 INFO L87 Difference]: Start difference. First operand 292 states and 489 transitions. Second operand 18 states. [2020-07-21 16:02:42,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:42,489 INFO L93 Difference]: Finished difference Result 354 states and 657 transitions. [2020-07-21 16:02:42,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:02:42,491 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 370 [2020-07-21 16:02:42,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:42,496 INFO L225 Difference]: With dead ends: 354 [2020-07-21 16:02:42,496 INFO L226 Difference]: Without dead ends: 350 [2020-07-21 16:02:42,497 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 745 GetRequests, 711 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:02:42,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2020-07-21 16:02:42,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 297. [2020-07-21 16:02:42,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2020-07-21 16:02:42,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 503 transitions. [2020-07-21 16:02:42,512 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 503 transitions. Word has length 370 [2020-07-21 16:02:42,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:42,512 INFO L479 AbstractCegarLoop]: Abstraction has 297 states and 503 transitions. [2020-07-21 16:02:42,512 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:02:42,512 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 503 transitions. [2020-07-21 16:02:42,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 16:02:42,514 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:42,515 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 21, 20, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 14, 12, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:42,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:42,716 INFO L427 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:42,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:42,717 INFO L82 PathProgramCache]: Analyzing trace with hash 1524744654, now seen corresponding path program 39 times [2020-07-21 16:02:42,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:42,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142768659] [2020-07-21 16:02:42,718 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:02:43,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:43,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:43,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:02:43,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:43,716 INFO L134 CoverageAnalysis]: Checked inductivity of 5780 backedges. 905 proven. 703 refuted. 0 times theorem prover too weak. 4172 trivial. 0 not checked. [2020-07-21 16:02:43,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:46,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:46,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:46,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:47,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:47,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:48,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:48,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:48,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:48,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,888 INFO L134 CoverageAnalysis]: Checked inductivity of 5780 backedges. 909 proven. 719 refuted. 0 times theorem prover too weak. 4152 trivial. 0 not checked. [2020-07-21 16:02:49,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142768659] [2020-07-21 16:02:49,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:49,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 16:02:49,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520646771] [2020-07-21 16:02:49,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:02:49,890 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:49,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:02:49,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:02:49,891 INFO L87 Difference]: Start difference. First operand 297 states and 503 transitions. Second operand 27 states. [2020-07-21 16:02:52,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:52,034 INFO L93 Difference]: Finished difference Result 722 states and 1314 transitions. [2020-07-21 16:02:52,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-21 16:02:52,036 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 450 [2020-07-21 16:02:52,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:52,041 INFO L225 Difference]: With dead ends: 722 [2020-07-21 16:02:52,041 INFO L226 Difference]: Without dead ends: 408 [2020-07-21 16:02:52,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 923 GetRequests, 853 SyntacticMatches, 21 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 482 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=414, Invalid=2136, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 16:02:52,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-21 16:02:52,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 324. [2020-07-21 16:02:52,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 324 states. [2020-07-21 16:02:52,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 581 transitions. [2020-07-21 16:02:52,065 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 581 transitions. Word has length 450 [2020-07-21 16:02:52,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:52,065 INFO L479 AbstractCegarLoop]: Abstraction has 324 states and 581 transitions. [2020-07-21 16:02:52,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:02:52,065 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 581 transitions. [2020-07-21 16:02:52,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2020-07-21 16:02:52,067 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:52,068 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 17, 16, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 10, 10, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:52,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:52,268 INFO L427 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:52,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:52,269 INFO L82 PathProgramCache]: Analyzing trace with hash -1138981697, now seen corresponding path program 40 times [2020-07-21 16:02:52,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:52,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1087504947] [2020-07-21 16:02:52,270 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:02:52,958 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:52,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:52,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 799 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:02:52,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:53,108 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 384 proven. 352 refuted. 0 times theorem prover too weak. 2848 trivial. 0 not checked. [2020-07-21 16:02:53,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:55,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:55,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:55,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:56,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:56,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:56,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:56,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:56,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:56,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:57,249 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 386 proven. 366 refuted. 0 times theorem prover too weak. 2832 trivial. 0 not checked. [2020-07-21 16:02:57,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1087504947] [2020-07-21 16:02:57,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:57,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:02:57,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779582191] [2020-07-21 16:02:57,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:02:57,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:57,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:02:57,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:02:57,251 INFO L87 Difference]: Start difference. First operand 324 states and 581 transitions. Second operand 18 states. [2020-07-21 16:02:57,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:57,740 INFO L93 Difference]: Finished difference Result 346 states and 628 transitions. [2020-07-21 16:02:57,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:02:57,742 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 358 [2020-07-21 16:02:57,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:57,747 INFO L225 Difference]: With dead ends: 346 [2020-07-21 16:02:57,747 INFO L226 Difference]: Without dead ends: 342 [2020-07-21 16:02:57,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 721 GetRequests, 687 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:02:57,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-21 16:02:57,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 311. [2020-07-21 16:02:57,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 311 states. [2020-07-21 16:02:57,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 540 transitions. [2020-07-21 16:02:57,765 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 540 transitions. Word has length 358 [2020-07-21 16:02:57,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:57,765 INFO L479 AbstractCegarLoop]: Abstraction has 311 states and 540 transitions. [2020-07-21 16:02:57,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:02:57,765 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 540 transitions. [2020-07-21 16:02:57,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 523 [2020-07-21 16:02:57,769 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:57,769 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 37, 37, 22, 21, 21, 21, 21, 21, 21, 21, 21, 20, 18, 18, 18, 18, 18, 18, 18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:57,969 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:57,970 INFO L427 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:57,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:57,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1193277290, now seen corresponding path program 7 times [2020-07-21 16:02:57,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:57,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [73180836] [2020-07-21 16:02:57,971 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:02:58,672 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:58,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:58,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 764 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:02:58,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:59,145 INFO L134 CoverageAnalysis]: Checked inductivity of 7960 backedges. 729 proven. 1504 refuted. 0 times theorem prover too weak. 5727 trivial. 0 not checked. [2020-07-21 16:02:59,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:02,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:06,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:06,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:07,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:07,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:07,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:07,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:07,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:07,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:08,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:08,270 INFO L134 CoverageAnalysis]: Checked inductivity of 7960 backedges. 731 proven. 1533 refuted. 0 times theorem prover too weak. 5696 trivial. 0 not checked. [2020-07-21 16:03:08,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [73180836] [2020-07-21 16:03:08,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:08,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 16:03:08,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700970931] [2020-07-21 16:03:08,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:03:08,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:08,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:03:08,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:03:08,272 INFO L87 Difference]: Start difference. First operand 311 states and 540 transitions. Second operand 31 states. [2020-07-21 16:03:10,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:10,932 INFO L93 Difference]: Finished difference Result 659 states and 1225 transitions. [2020-07-21 16:03:10,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 16:03:10,934 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 522 [2020-07-21 16:03:10,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:10,939 INFO L225 Difference]: With dead ends: 659 [2020-07-21 16:03:10,939 INFO L226 Difference]: Without dead ends: 346 [2020-07-21 16:03:10,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1069 GetRequests, 990 SyntacticMatches, 25 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=484, Invalid=2596, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 16:03:10,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-07-21 16:03:10,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 242. [2020-07-21 16:03:10,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2020-07-21 16:03:10,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 381 transitions. [2020-07-21 16:03:10,954 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 381 transitions. Word has length 522 [2020-07-21 16:03:10,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:10,954 INFO L479 AbstractCegarLoop]: Abstraction has 242 states and 381 transitions. [2020-07-21 16:03:10,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:03:10,954 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 381 transitions. [2020-07-21 16:03:10,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 383 [2020-07-21 16:03:10,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:10,956 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 17, 16, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 12, 12, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:11,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:11,157 INFO L427 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:11,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:11,158 INFO L82 PathProgramCache]: Analyzing trace with hash -1564268195, now seen corresponding path program 41 times [2020-07-21 16:03:11,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:11,158 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210270322] [2020-07-21 16:03:11,159 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:03:11,896 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:03:11,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:11,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:03:11,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:12,143 INFO L134 CoverageAnalysis]: Checked inductivity of 4120 backedges. 622 proven. 170 refuted. 0 times theorem prover too weak. 3328 trivial. 0 not checked. [2020-07-21 16:03:12,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:13,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:13,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:14,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:14,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:16,788 INFO L134 CoverageAnalysis]: Checked inductivity of 4120 backedges. 626 proven. 182 refuted. 0 times theorem prover too weak. 3312 trivial. 0 not checked. [2020-07-21 16:03:16,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210270322] [2020-07-21 16:03:16,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:16,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:03:16,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101596732] [2020-07-21 16:03:16,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:03:16,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:16,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:03:16,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:03:16,790 INFO L87 Difference]: Start difference. First operand 242 states and 381 transitions. Second operand 18 states. [2020-07-21 16:03:17,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:17,302 INFO L93 Difference]: Finished difference Result 272 states and 448 transitions. [2020-07-21 16:03:17,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:03:17,305 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 382 [2020-07-21 16:03:17,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:17,309 INFO L225 Difference]: With dead ends: 272 [2020-07-21 16:03:17,309 INFO L226 Difference]: Without dead ends: 268 [2020-07-21 16:03:17,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 735 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:03:17,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2020-07-21 16:03:17,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 258. [2020-07-21 16:03:17,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 258 states. [2020-07-21 16:03:17,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 424 transitions. [2020-07-21 16:03:17,325 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 424 transitions. Word has length 382 [2020-07-21 16:03:17,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:17,325 INFO L479 AbstractCegarLoop]: Abstraction has 258 states and 424 transitions. [2020-07-21 16:03:17,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:03:17,325 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 424 transitions. [2020-07-21 16:03:17,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2020-07-21 16:03:17,327 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:17,327 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 17, 16, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:17,528 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:17,528 INFO L427 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:17,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:17,529 INFO L82 PathProgramCache]: Analyzing trace with hash 340715003, now seen corresponding path program 42 times [2020-07-21 16:03:17,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:17,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [911089749] [2020-07-21 16:03:17,530 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:03:18,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:03:18,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:18,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 907 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:03:18,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:18,478 INFO L134 CoverageAnalysis]: Checked inductivity of 4696 backedges. 547 proven. 165 refuted. 0 times theorem prover too weak. 3984 trivial. 0 not checked. [2020-07-21 16:03:18,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:19,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:19,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:20,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:20,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:20,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:20,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:20,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:20,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:20,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:21,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:22,476 INFO L134 CoverageAnalysis]: Checked inductivity of 4696 backedges. 549 proven. 173 refuted. 0 times theorem prover too weak. 3974 trivial. 0 not checked. [2020-07-21 16:03:22,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [911089749] [2020-07-21 16:03:22,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:22,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:03:22,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538106887] [2020-07-21 16:03:22,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:03:22,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:22,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:03:22,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:03:22,479 INFO L87 Difference]: Start difference. First operand 258 states and 424 transitions. Second operand 16 states. [2020-07-21 16:03:22,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:22,904 INFO L93 Difference]: Finished difference Result 296 states and 514 transitions. [2020-07-21 16:03:22,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:03:22,906 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 406 [2020-07-21 16:03:22,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:22,910 INFO L225 Difference]: With dead ends: 296 [2020-07-21 16:03:22,910 INFO L226 Difference]: Without dead ends: 292 [2020-07-21 16:03:22,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 787 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:03:22,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2020-07-21 16:03:22,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 250. [2020-07-21 16:03:22,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 250 states. [2020-07-21 16:03:22,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 404 transitions. [2020-07-21 16:03:22,927 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 404 transitions. Word has length 406 [2020-07-21 16:03:22,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:22,927 INFO L479 AbstractCegarLoop]: Abstraction has 250 states and 404 transitions. [2020-07-21 16:03:22,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:03:22,927 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 404 transitions. [2020-07-21 16:03:22,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-21 16:03:22,930 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:22,930 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 17, 16, 16, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:23,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:23,131 INFO L427 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:23,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:23,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1562952590, now seen corresponding path program 43 times [2020-07-21 16:03:23,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:23,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1683679379] [2020-07-21 16:03:23,133 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:23,943 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:03:23,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:23,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:03:23,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:24,143 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 174 proven. 964 refuted. 0 times theorem prover too weak. 3862 trivial. 0 not checked. [2020-07-21 16:03:24,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:28,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:29,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:30,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:31,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:31,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:31,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,274 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 174 proven. 994 refuted. 0 times theorem prover too weak. 3832 trivial. 0 not checked. [2020-07-21 16:03:32,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1683679379] [2020-07-21 16:03:32,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:32,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:03:32,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67343474] [2020-07-21 16:03:32,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:03:32,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:32,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:03:32,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:03:32,276 INFO L87 Difference]: Start difference. First operand 250 states and 404 transitions. Second operand 22 states. [2020-07-21 16:03:33,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:33,026 INFO L93 Difference]: Finished difference Result 260 states and 420 transitions. [2020-07-21 16:03:33,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:03:33,029 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 418 [2020-07-21 16:03:33,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:33,032 INFO L225 Difference]: With dead ends: 260 [2020-07-21 16:03:33,032 INFO L226 Difference]: Without dead ends: 256 [2020-07-21 16:03:33,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 843 GetRequests, 799 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:03:33,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-21 16:03:33,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 230. [2020-07-21 16:03:33,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2020-07-21 16:03:33,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 358 transitions. [2020-07-21 16:03:33,044 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 358 transitions. Word has length 418 [2020-07-21 16:03:33,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:33,045 INFO L479 AbstractCegarLoop]: Abstraction has 230 states and 358 transitions. [2020-07-21 16:03:33,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:03:33,045 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 358 transitions. [2020-07-21 16:03:33,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 826 [2020-07-21 16:03:33,050 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:33,051 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 55, 55, 40, 40, 34, 34, 34, 34, 34, 34, 34, 28, 27, 27, 27, 27, 27, 27, 27, 15, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:33,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:33,252 INFO L427 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:33,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:33,253 INFO L82 PathProgramCache]: Analyzing trace with hash -1147789510, now seen corresponding path program 44 times [2020-07-21 16:03:33,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:33,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112116061] [2020-07-21 16:03:33,254 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:34,116 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:03:34,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:34,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 1218 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:03:34,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:34,684 INFO L134 CoverageAnalysis]: Checked inductivity of 20260 backedges. 10848 proven. 981 refuted. 0 times theorem prover too weak. 8431 trivial. 0 not checked. [2020-07-21 16:03:34,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:42,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:42,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:42,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:42,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:42,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:42,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:42,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:42,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:46,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:47,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:47,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:47,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:47,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:48,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:48,396 INFO L134 CoverageAnalysis]: Checked inductivity of 20260 backedges. 1154 proven. 2534 refuted. 0 times theorem prover too weak. 16572 trivial. 0 not checked. [2020-07-21 16:03:48,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112116061] [2020-07-21 16:03:48,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:48,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 16:03:48,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784950104] [2020-07-21 16:03:48,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:03:48,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:48,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:03:48,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:03:48,398 INFO L87 Difference]: Start difference. First operand 230 states and 358 transitions. Second operand 29 states. [2020-07-21 16:03:50,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:50,624 INFO L93 Difference]: Finished difference Result 521 states and 867 transitions. [2020-07-21 16:03:50,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 16:03:50,626 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 825 [2020-07-21 16:03:50,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:50,631 INFO L225 Difference]: With dead ends: 521 [2020-07-21 16:03:50,631 INFO L226 Difference]: Without dead ends: 287 [2020-07-21 16:03:50,633 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1671 GetRequests, 1599 SyntacticMatches, 23 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 508 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=400, Invalid=2150, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 16:03:50,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2020-07-21 16:03:50,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 253. [2020-07-21 16:03:50,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 253 states. [2020-07-21 16:03:50,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 410 transitions. [2020-07-21 16:03:50,647 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 410 transitions. Word has length 825 [2020-07-21 16:03:50,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:50,648 INFO L479 AbstractCegarLoop]: Abstraction has 253 states and 410 transitions. [2020-07-21 16:03:50,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:03:50,648 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 410 transitions. [2020-07-21 16:03:50,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 560 [2020-07-21 16:03:50,651 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:50,651 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 39, 39, 27, 27, 22, 22, 22, 22, 22, 22, 22, 19, 19, 19, 19, 19, 19, 19, 17, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:50,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:50,852 INFO L427 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:50,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:50,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1906168914, now seen corresponding path program 45 times [2020-07-21 16:03:50,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:50,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393505655] [2020-07-21 16:03:50,854 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:51,748 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:03:51,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:51,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 1246 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:03:51,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:52,076 INFO L134 CoverageAnalysis]: Checked inductivity of 9058 backedges. 216 proven. 1399 refuted. 0 times theorem prover too weak. 7443 trivial. 0 not checked. [2020-07-21 16:03:52,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:58,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:59,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:59,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:00,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:00,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:01,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:01,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:01,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:01,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:01,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:01,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:01,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:02,100 INFO L134 CoverageAnalysis]: Checked inductivity of 9058 backedges. 216 proven. 1432 refuted. 0 times theorem prover too weak. 7410 trivial. 0 not checked. [2020-07-21 16:04:02,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393505655] [2020-07-21 16:04:02,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:02,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:04:02,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801192551] [2020-07-21 16:04:02,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:04:02,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:02,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:04:02,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:04:02,102 INFO L87 Difference]: Start difference. First operand 253 states and 410 transitions. Second operand 22 states. [2020-07-21 16:04:02,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:02,912 INFO L93 Difference]: Finished difference Result 293 states and 505 transitions. [2020-07-21 16:04:02,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:04:02,916 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 559 [2020-07-21 16:04:02,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:02,921 INFO L225 Difference]: With dead ends: 293 [2020-07-21 16:04:02,921 INFO L226 Difference]: Without dead ends: 289 [2020-07-21 16:04:02,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1125 GetRequests, 1081 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:04:02,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-21 16:04:02,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 283. [2020-07-21 16:04:02,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 283 states. [2020-07-21 16:04:02,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 487 transitions. [2020-07-21 16:04:02,937 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 487 transitions. Word has length 559 [2020-07-21 16:04:02,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:02,938 INFO L479 AbstractCegarLoop]: Abstraction has 283 states and 487 transitions. [2020-07-21 16:04:02,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:04:02,938 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 487 transitions. [2020-07-21 16:04:02,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2020-07-21 16:04:02,942 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:02,942 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 39, 27, 27, 20, 20, 20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 19, 13, 12, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:03,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:03,143 INFO L427 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:03,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:03,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1477358126, now seen corresponding path program 46 times [2020-07-21 16:04:03,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:03,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1194693753] [2020-07-21 16:04:03,145 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:04,036 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:04,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:04,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 1192 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:04:04,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:04,328 INFO L134 CoverageAnalysis]: Checked inductivity of 8230 backedges. 256 proven. 1093 refuted. 0 times theorem prover too weak. 6881 trivial. 0 not checked. [2020-07-21 16:04:04,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:09,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:09,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:10,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:11,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:11,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:11,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:11,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:11,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:12,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:12,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:12,291 INFO L134 CoverageAnalysis]: Checked inductivity of 8230 backedges. 256 proven. 1117 refuted. 0 times theorem prover too weak. 6857 trivial. 0 not checked. [2020-07-21 16:04:12,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1194693753] [2020-07-21 16:04:12,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:12,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:04:12,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291218411] [2020-07-21 16:04:12,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:04:12,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:12,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:04:12,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:04:12,293 INFO L87 Difference]: Start difference. First operand 283 states and 487 transitions. Second operand 20 states. [2020-07-21 16:04:12,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:12,957 INFO L93 Difference]: Finished difference Result 337 states and 622 transitions. [2020-07-21 16:04:12,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:04:12,960 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 535 [2020-07-21 16:04:12,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:12,966 INFO L225 Difference]: With dead ends: 337 [2020-07-21 16:04:12,966 INFO L226 Difference]: Without dead ends: 333 [2020-07-21 16:04:12,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1076 GetRequests, 1037 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:04:12,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-21 16:04:12,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 267. [2020-07-21 16:04:12,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2020-07-21 16:04:12,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 442 transitions. [2020-07-21 16:04:12,990 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 442 transitions. Word has length 535 [2020-07-21 16:04:12,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:12,991 INFO L479 AbstractCegarLoop]: Abstraction has 267 states and 442 transitions. [2020-07-21 16:04:12,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:04:12,991 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 442 transitions. [2020-07-21 16:04:12,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 524 [2020-07-21 16:04:12,995 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:12,996 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 27, 27, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 12, 11, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:13,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:13,212 INFO L427 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:13,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:13,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1550074267, now seen corresponding path program 47 times [2020-07-21 16:04:13,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:13,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473530588] [2020-07-21 16:04:13,214 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:14,116 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:14,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:14,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 1165 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:04:14,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:14,504 INFO L134 CoverageAnalysis]: Checked inductivity of 7846 backedges. 287 proven. 1032 refuted. 0 times theorem prover too weak. 6527 trivial. 0 not checked. [2020-07-21 16:04:14,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:19,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:19,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:21,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:22,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:22,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:22,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,653 INFO L134 CoverageAnalysis]: Checked inductivity of 7846 backedges. 287 proven. 1056 refuted. 0 times theorem prover too weak. 6503 trivial. 0 not checked. [2020-07-21 16:04:23,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473530588] [2020-07-21 16:04:23,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:23,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:04:23,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679685306] [2020-07-21 16:04:23,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:04:23,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:23,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:04:23,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:04:23,655 INFO L87 Difference]: Start difference. First operand 267 states and 442 transitions. Second operand 20 states. [2020-07-21 16:04:24,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:24,383 INFO L93 Difference]: Finished difference Result 327 states and 598 transitions. [2020-07-21 16:04:24,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:04:24,387 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 523 [2020-07-21 16:04:24,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:24,392 INFO L225 Difference]: With dead ends: 327 [2020-07-21 16:04:24,392 INFO L226 Difference]: Without dead ends: 323 [2020-07-21 16:04:24,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1052 GetRequests, 1013 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:04:24,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2020-07-21 16:04:24,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 267. [2020-07-21 16:04:24,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2020-07-21 16:04:24,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 442 transitions. [2020-07-21 16:04:24,408 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 442 transitions. Word has length 523 [2020-07-21 16:04:24,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:24,408 INFO L479 AbstractCegarLoop]: Abstraction has 267 states and 442 transitions. [2020-07-21 16:04:24,408 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:04:24,408 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 442 transitions. [2020-07-21 16:04:24,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2020-07-21 16:04:24,412 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:24,413 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 35, 35, 27, 27, 22, 22, 22, 22, 22, 22, 22, 17, 17, 17, 17, 17, 17, 17, 17, 10, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:24,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:24,627 INFO L427 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:24,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:24,628 INFO L82 PathProgramCache]: Analyzing trace with hash 947381302, now seen corresponding path program 48 times [2020-07-21 16:04:24,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:24,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [921295449] [2020-07-21 16:04:24,629 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:25,612 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:25,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:25,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 1192 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:04:25,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:25,870 INFO L134 CoverageAnalysis]: Checked inductivity of 8334 backedges. 347 proven. 826 refuted. 0 times theorem prover too weak. 7161 trivial. 0 not checked. [2020-07-21 16:04:25,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:29,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:30,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:31,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:31,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:31,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:31,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:32,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:32,915 INFO L134 CoverageAnalysis]: Checked inductivity of 8334 backedges. 347 proven. 842 refuted. 0 times theorem prover too weak. 7145 trivial. 0 not checked. [2020-07-21 16:04:32,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [921295449] [2020-07-21 16:04:32,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:32,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:04:32,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545718924] [2020-07-21 16:04:32,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:04:32,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:32,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:04:32,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:04:32,917 INFO L87 Difference]: Start difference. First operand 267 states and 442 transitions. Second operand 18 states. [2020-07-21 16:04:33,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:33,601 INFO L93 Difference]: Finished difference Result 327 states and 596 transitions. [2020-07-21 16:04:33,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:04:33,605 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 535 [2020-07-21 16:04:33,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:33,610 INFO L225 Difference]: With dead ends: 327 [2020-07-21 16:04:33,610 INFO L226 Difference]: Without dead ends: 323 [2020-07-21 16:04:33,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1075 GetRequests, 1041 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:04:33,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2020-07-21 16:04:33,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 273. [2020-07-21 16:04:33,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2020-07-21 16:04:33,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 458 transitions. [2020-07-21 16:04:33,627 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 458 transitions. Word has length 535 [2020-07-21 16:04:33,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:33,627 INFO L479 AbstractCegarLoop]: Abstraction has 273 states and 458 transitions. [2020-07-21 16:04:33,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:04:33,628 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 458 transitions. [2020-07-21 16:04:33,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 572 [2020-07-21 16:04:33,633 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:33,633 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 41, 41, 27, 27, 22, 22, 22, 22, 22, 22, 22, 20, 20, 20, 20, 20, 20, 20, 17, 14, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:33,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:33,838 INFO L427 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:33,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:33,839 INFO L82 PathProgramCache]: Analyzing trace with hash -373773045, now seen corresponding path program 49 times [2020-07-21 16:04:33,839 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:33,839 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [909355036] [2020-07-21 16:04:33,840 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:34,783 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:34,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:34,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 1273 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:04:34,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:35,106 INFO L134 CoverageAnalysis]: Checked inductivity of 9450 backedges. 492 proven. 953 refuted. 0 times theorem prover too weak. 8005 trivial. 0 not checked. [2020-07-21 16:04:35,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:40,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:40,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:42,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:42,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:43,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:43,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:43,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:43,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:45,210 INFO L134 CoverageAnalysis]: Checked inductivity of 9450 backedges. 494 proven. 975 refuted. 0 times theorem prover too weak. 7981 trivial. 0 not checked. [2020-07-21 16:04:45,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [909355036] [2020-07-21 16:04:45,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:45,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:04:45,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69212421] [2020-07-21 16:04:45,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:04:45,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:45,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:04:45,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:04:45,212 INFO L87 Difference]: Start difference. First operand 273 states and 458 transitions. Second operand 20 states. [2020-07-21 16:04:45,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:45,994 INFO L93 Difference]: Finished difference Result 303 states and 526 transitions. [2020-07-21 16:04:45,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:04:45,997 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 571 [2020-07-21 16:04:45,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:46,002 INFO L225 Difference]: With dead ends: 303 [2020-07-21 16:04:46,002 INFO L226 Difference]: Without dead ends: 299 [2020-07-21 16:04:46,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1148 GetRequests, 1109 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:04:46,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2020-07-21 16:04:46,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 271. [2020-07-21 16:04:46,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 271 states. [2020-07-21 16:04:46,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 455 transitions. [2020-07-21 16:04:46,017 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 455 transitions. Word has length 571 [2020-07-21 16:04:46,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:46,017 INFO L479 AbstractCegarLoop]: Abstraction has 271 states and 455 transitions. [2020-07-21 16:04:46,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:04:46,018 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 455 transitions. [2020-07-21 16:04:46,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 528 [2020-07-21 16:04:46,020 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:46,021 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 37, 37, 23, 23, 21, 21, 21, 21, 21, 21, 21, 19, 18, 18, 18, 18, 18, 18, 18, 14, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:46,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:46,222 INFO L427 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:46,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:46,222 INFO L82 PathProgramCache]: Analyzing trace with hash -736328820, now seen corresponding path program 50 times [2020-07-21 16:04:46,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:46,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227099124] [2020-07-21 16:04:46,223 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:47,108 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:04:47,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:47,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 779 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:04:47,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:47,543 INFO L134 CoverageAnalysis]: Checked inductivity of 8066 backedges. 1240 proven. 842 refuted. 0 times theorem prover too weak. 5984 trivial. 0 not checked. [2020-07-21 16:04:47,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:52,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:52,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:53,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:54,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:54,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:54,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:54,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:57,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:57,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:58,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:58,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:58,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:58,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:58,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:58,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:59,938 INFO L134 CoverageAnalysis]: Checked inductivity of 8066 backedges. 1240 proven. 868 refuted. 0 times theorem prover too weak. 5958 trivial. 0 not checked. [2020-07-21 16:04:59,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227099124] [2020-07-21 16:04:59,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:59,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 16:04:59,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39654078] [2020-07-21 16:04:59,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:04:59,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:59,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:04:59,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:04:59,940 INFO L87 Difference]: Start difference. First operand 271 states and 455 transitions. Second operand 29 states. [2020-07-21 16:05:02,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:02,650 INFO L93 Difference]: Finished difference Result 573 states and 980 transitions. [2020-07-21 16:05:02,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 16:05:02,652 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 527 [2020-07-21 16:05:02,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:02,656 INFO L225 Difference]: With dead ends: 573 [2020-07-21 16:05:02,656 INFO L226 Difference]: Without dead ends: 302 [2020-07-21 16:05:02,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1071 GetRequests, 1003 SyntacticMatches, 23 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=342, Invalid=1820, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 16:05:02,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2020-07-21 16:05:02,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 265. [2020-07-21 16:05:02,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 265 states. [2020-07-21 16:05:02,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 420 transitions. [2020-07-21 16:05:02,677 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 420 transitions. Word has length 527 [2020-07-21 16:05:02,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:02,678 INFO L479 AbstractCegarLoop]: Abstraction has 265 states and 420 transitions. [2020-07-21 16:05:02,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:05:02,678 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 420 transitions. [2020-07-21 16:05:02,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 548 [2020-07-21 16:05:02,682 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:02,682 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 37, 37, 27, 27, 22, 22, 22, 22, 22, 22, 22, 18, 18, 18, 18, 18, 18, 18, 17, 10, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:02,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:02,883 INFO L427 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:02,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:02,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1279110677, now seen corresponding path program 51 times [2020-07-21 16:05:02,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:02,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [287956803] [2020-07-21 16:05:02,885 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:03,876 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:03,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:03,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 1219 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:05:03,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:04,188 INFO L134 CoverageAnalysis]: Checked inductivity of 8686 backedges. 447 proven. 750 refuted. 0 times theorem prover too weak. 7489 trivial. 0 not checked. [2020-07-21 16:05:04,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:09,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:10,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:10,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:11,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:11,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:11,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:11,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:11,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:11,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:11,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:12,564 INFO L134 CoverageAnalysis]: Checked inductivity of 8686 backedges. 447 proven. 768 refuted. 0 times theorem prover too weak. 7471 trivial. 0 not checked. [2020-07-21 16:05:12,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [287956803] [2020-07-21 16:05:12,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:12,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:05:12,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904462508] [2020-07-21 16:05:12,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:05:12,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:12,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:05:12,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:05:12,566 INFO L87 Difference]: Start difference. First operand 265 states and 420 transitions. Second operand 18 states. [2020-07-21 16:05:13,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:13,233 INFO L93 Difference]: Finished difference Result 312 states and 522 transitions. [2020-07-21 16:05:13,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:05:13,237 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 547 [2020-07-21 16:05:13,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:13,241 INFO L225 Difference]: With dead ends: 312 [2020-07-21 16:05:13,241 INFO L226 Difference]: Without dead ends: 308 [2020-07-21 16:05:13,241 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1099 GetRequests, 1065 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:05:13,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2020-07-21 16:05:13,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 270. [2020-07-21 16:05:13,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-21 16:05:13,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 433 transitions. [2020-07-21 16:05:13,265 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 433 transitions. Word has length 547 [2020-07-21 16:05:13,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:13,266 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 433 transitions. [2020-07-21 16:05:13,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:05:13,266 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 433 transitions. [2020-07-21 16:05:13,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-21 16:05:13,271 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:13,271 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 44, 44, 27, 27, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 18, 17, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:13,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:13,485 INFO L427 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:13,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:13,486 INFO L82 PathProgramCache]: Analyzing trace with hash -1023918165, now seen corresponding path program 52 times [2020-07-21 16:05:13,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:13,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938787848] [2020-07-21 16:05:13,487 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:14,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:14,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:14,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 1327 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:05:14,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:14,852 INFO L134 CoverageAnalysis]: Checked inductivity of 10294 backedges. 496 proven. 807 refuted. 0 times theorem prover too weak. 8991 trivial. 0 not checked. [2020-07-21 16:05:14,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:20,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:20,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:22,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:22,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:23,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:23,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:23,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:23,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:23,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:23,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:23,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:23,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:24,345 INFO L134 CoverageAnalysis]: Checked inductivity of 10294 backedges. 498 proven. 821 refuted. 0 times theorem prover too weak. 8975 trivial. 0 not checked. [2020-07-21 16:05:24,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938787848] [2020-07-21 16:05:24,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:24,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:05:24,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147126296] [2020-07-21 16:05:24,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:05:24,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:24,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:05:24,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:05:24,347 INFO L87 Difference]: Start difference. First operand 270 states and 433 transitions. Second operand 18 states. [2020-07-21 16:05:24,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:24,973 INFO L93 Difference]: Finished difference Result 313 states and 528 transitions. [2020-07-21 16:05:24,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:05:24,978 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 595 [2020-07-21 16:05:24,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:24,983 INFO L225 Difference]: With dead ends: 313 [2020-07-21 16:05:24,983 INFO L226 Difference]: Without dead ends: 309 [2020-07-21 16:05:24,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1195 GetRequests, 1161 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:05:24,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2020-07-21 16:05:25,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 270. [2020-07-21 16:05:25,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-21 16:05:25,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 433 transitions. [2020-07-21 16:05:25,008 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 433 transitions. Word has length 595 [2020-07-21 16:05:25,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:25,009 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 433 transitions. [2020-07-21 16:05:25,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:05:25,009 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 433 transitions. [2020-07-21 16:05:25,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 608 [2020-07-21 16:05:25,014 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:25,015 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 45, 45, 27, 27, 23, 23, 23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 22, 22, 19, 18, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:25,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:25,229 INFO L427 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:25,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:25,230 INFO L82 PathProgramCache]: Analyzing trace with hash 70260500, now seen corresponding path program 53 times [2020-07-21 16:05:25,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:25,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [886011383] [2020-07-21 16:05:25,231 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:26,252 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:26,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:26,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 1354 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:05:26,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:26,604 INFO L134 CoverageAnalysis]: Checked inductivity of 10738 backedges. 671 proven. 662 refuted. 0 times theorem prover too weak. 9405 trivial. 0 not checked. [2020-07-21 16:05:26,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:32,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:32,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:33,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:34,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:34,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:34,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:34,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:34,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:35,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:35,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:38,239 INFO L134 CoverageAnalysis]: Checked inductivity of 10738 backedges. 673 proven. 676 refuted. 0 times theorem prover too weak. 9389 trivial. 0 not checked. [2020-07-21 16:05:38,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [886011383] [2020-07-21 16:05:38,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:38,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:05:38,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151040881] [2020-07-21 16:05:38,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:05:38,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:38,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:05:38,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:05:38,241 INFO L87 Difference]: Start difference. First operand 270 states and 433 transitions. Second operand 18 states. [2020-07-21 16:05:38,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:38,832 INFO L93 Difference]: Finished difference Result 318 states and 548 transitions. [2020-07-21 16:05:38,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:05:38,834 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 607 [2020-07-21 16:05:38,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:38,837 INFO L225 Difference]: With dead ends: 318 [2020-07-21 16:05:38,837 INFO L226 Difference]: Without dead ends: 314 [2020-07-21 16:05:38,837 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1219 GetRequests, 1185 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:05:38,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2020-07-21 16:05:38,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 296. [2020-07-21 16:05:38,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-21 16:05:38,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 504 transitions. [2020-07-21 16:05:38,853 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 504 transitions. Word has length 607 [2020-07-21 16:05:38,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:38,853 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 504 transitions. [2020-07-21 16:05:38,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:05:38,853 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 504 transitions. [2020-07-21 16:05:38,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 632 [2020-07-21 16:05:38,856 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:38,857 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 47, 47, 27, 27, 24, 24, 24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 23, 21, 20, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:39,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:39,058 INFO L427 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:39,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:39,059 INFO L82 PathProgramCache]: Analyzing trace with hash -816154808, now seen corresponding path program 54 times [2020-07-21 16:05:39,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:39,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050382863] [2020-07-21 16:05:39,059 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:40,068 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:40,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:40,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 1408 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:05:40,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:40,318 INFO L134 CoverageAnalysis]: Checked inductivity of 11654 backedges. 718 proven. 669 refuted. 0 times theorem prover too weak. 10267 trivial. 0 not checked. [2020-07-21 16:05:40,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:46,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:46,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:47,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:47,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:48,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:48,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:48,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:48,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:49,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:50,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:52,304 INFO L134 CoverageAnalysis]: Checked inductivity of 11654 backedges. 718 proven. 687 refuted. 0 times theorem prover too weak. 10249 trivial. 0 not checked. [2020-07-21 16:05:52,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050382863] [2020-07-21 16:05:52,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:52,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:05:52,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882411123] [2020-07-21 16:05:52,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:05:52,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:52,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:05:52,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:05:52,306 INFO L87 Difference]: Start difference. First operand 296 states and 504 transitions. Second operand 18 states. [2020-07-21 16:05:53,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:53,132 INFO L93 Difference]: Finished difference Result 357 states and 667 transitions. [2020-07-21 16:05:53,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:05:53,137 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 631 [2020-07-21 16:05:53,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:53,143 INFO L225 Difference]: With dead ends: 357 [2020-07-21 16:05:53,143 INFO L226 Difference]: Without dead ends: 353 [2020-07-21 16:05:53,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1267 GetRequests, 1233 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:05:53,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-21 16:05:53,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 293. [2020-07-21 16:05:53,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 293 states. [2020-07-21 16:05:53,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 495 transitions. [2020-07-21 16:05:53,172 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 495 transitions. Word has length 631 [2020-07-21 16:05:53,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:53,173 INFO L479 AbstractCegarLoop]: Abstraction has 293 states and 495 transitions. [2020-07-21 16:05:53,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:05:53,174 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 495 transitions. [2020-07-21 16:05:53,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 656 [2020-07-21 16:05:53,180 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:53,181 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 27, 27, 25, 25, 25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 24, 24, 23, 22, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:53,393 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:53,394 INFO L427 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:53,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:53,395 INFO L82 PathProgramCache]: Analyzing trace with hash -1323253512, now seen corresponding path program 55 times [2020-07-21 16:05:53,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:53,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1103274141] [2020-07-21 16:05:53,396 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:54,471 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:54,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:54,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 1462 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:05:54,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:54,830 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 1085 proven. 358 refuted. 0 times theorem prover too weak. 11167 trivial. 0 not checked. [2020-07-21 16:05:54,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:57,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:57,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:58,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:58,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:59,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:59,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:59,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:59,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:00,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:00,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:01,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:06,236 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 1087 proven. 374 refuted. 0 times theorem prover too weak. 11149 trivial. 0 not checked. [2020-07-21 16:06:06,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1103274141] [2020-07-21 16:06:06,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:06:06,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:06:06,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694901819] [2020-07-21 16:06:06,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:06:06,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:06:06,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:06:06,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:06:06,239 INFO L87 Difference]: Start difference. First operand 293 states and 495 transitions. Second operand 18 states. [2020-07-21 16:06:07,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:06:07,113 INFO L93 Difference]: Finished difference Result 326 states and 577 transitions. [2020-07-21 16:06:07,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:06:07,119 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 655 [2020-07-21 16:06:07,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:06:07,123 INFO L225 Difference]: With dead ends: 326 [2020-07-21 16:06:07,123 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 16:06:07,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1315 GetRequests, 1281 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:06:07,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 16:06:07,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 314. [2020-07-21 16:06:07,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2020-07-21 16:06:07,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 554 transitions. [2020-07-21 16:06:07,141 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 554 transitions. Word has length 655 [2020-07-21 16:06:07,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:06:07,142 INFO L479 AbstractCegarLoop]: Abstraction has 314 states and 554 transitions. [2020-07-21 16:06:07,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:06:07,142 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 554 transitions. [2020-07-21 16:06:07,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 692 [2020-07-21 16:06:07,147 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:06:07,147 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 52, 52, 27, 27, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:06:07,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:07,348 INFO L427 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:06:07,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:06:07,349 INFO L82 PathProgramCache]: Analyzing trace with hash 741132349, now seen corresponding path program 56 times [2020-07-21 16:06:07,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:06:07,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1175279749] [2020-07-21 16:06:07,350 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:08,437 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:06:08,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:06:08,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 1543 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:06:08,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:06:08,809 INFO L134 CoverageAnalysis]: Checked inductivity of 14118 backedges. 1131 proven. 396 refuted. 0 times theorem prover too weak. 12591 trivial. 0 not checked. [2020-07-21 16:06:08,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:06:13,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:13,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:14,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:15,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:15,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:15,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:15,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:15,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:16,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:17,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:20,243 INFO L134 CoverageAnalysis]: Checked inductivity of 14118 backedges. 1135 proven. 408 refuted. 0 times theorem prover too weak. 12575 trivial. 0 not checked. [2020-07-21 16:06:20,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1175279749] [2020-07-21 16:06:20,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:06:20,244 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:06:20,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384164368] [2020-07-21 16:06:20,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:06:20,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:06:20,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:06:20,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:06:20,246 INFO L87 Difference]: Start difference. First operand 314 states and 554 transitions. Second operand 18 states. [2020-07-21 16:06:20,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:06:20,698 INFO L93 Difference]: Finished difference Result 352 states and 650 transitions. [2020-07-21 16:06:20,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:06:20,700 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 691 [2020-07-21 16:06:20,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:06:20,704 INFO L225 Difference]: With dead ends: 352 [2020-07-21 16:06:20,705 INFO L226 Difference]: Without dead ends: 348 [2020-07-21 16:06:20,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1388 GetRequests, 1354 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:06:20,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-07-21 16:06:20,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 298. [2020-07-21 16:06:20,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2020-07-21 16:06:20,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 509 transitions. [2020-07-21 16:06:20,722 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 509 transitions. Word has length 691 [2020-07-21 16:06:20,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:06:20,722 INFO L479 AbstractCegarLoop]: Abstraction has 298 states and 509 transitions. [2020-07-21 16:06:20,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:06:20,722 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 509 transitions. [2020-07-21 16:06:20,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 644 [2020-07-21 16:06:20,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:06:20,726 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 44, 44, 27, 27, 26, 26, 26, 26, 26, 26, 26, 26, 22, 22, 22, 22, 22, 22, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:06:20,926 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:20,927 INFO L427 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:06:20,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:06:20,928 INFO L82 PathProgramCache]: Analyzing trace with hash -818195473, now seen corresponding path program 57 times [2020-07-21 16:06:20,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:06:20,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1537141224] [2020-07-21 16:06:20,929 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:22,097 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:06:22,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:06:22,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 1435 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:06:22,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:06:22,417 INFO L134 CoverageAnalysis]: Checked inductivity of 12222 backedges. 654 proven. 534 refuted. 0 times theorem prover too weak. 11034 trivial. 0 not checked. [2020-07-21 16:06:22,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:06:28,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:28,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:29,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:29,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:30,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:30,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:30,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:30,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:30,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:30,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:32,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:35,373 INFO L134 CoverageAnalysis]: Checked inductivity of 12222 backedges. 654 proven. 546 refuted. 0 times theorem prover too weak. 11022 trivial. 0 not checked. [2020-07-21 16:06:35,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1537141224] [2020-07-21 16:06:35,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:06:35,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:06:35,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173204408] [2020-07-21 16:06:35,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:06:35,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:06:35,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:06:35,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:06:35,376 INFO L87 Difference]: Start difference. First operand 298 states and 509 transitions. Second operand 16 states. [2020-07-21 16:06:36,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:06:36,097 INFO L93 Difference]: Finished difference Result 349 states and 650 transitions. [2020-07-21 16:06:36,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:06:36,103 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 643 [2020-07-21 16:06:36,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:06:36,108 INFO L225 Difference]: With dead ends: 349 [2020-07-21 16:06:36,108 INFO L226 Difference]: Without dead ends: 345 [2020-07-21 16:06:36,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1290 GetRequests, 1261 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:06:36,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2020-07-21 16:06:36,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 307. [2020-07-21 16:06:36,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 307 states. [2020-07-21 16:06:36,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 537 transitions. [2020-07-21 16:06:36,128 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 537 transitions. Word has length 643 [2020-07-21 16:06:36,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:06:36,129 INFO L479 AbstractCegarLoop]: Abstraction has 307 states and 537 transitions. [2020-07-21 16:06:36,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:06:36,129 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 537 transitions. [2020-07-21 16:06:36,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 680 [2020-07-21 16:06:36,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:06:36,134 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 48, 48, 28, 27, 27, 27, 27, 27, 27, 27, 27, 27, 24, 24, 24, 24, 24, 24, 24, 21, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:06:36,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:36,335 INFO L427 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:06:36,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:06:36,336 INFO L82 PathProgramCache]: Analyzing trace with hash -1851865034, now seen corresponding path program 7 times [2020-07-21 16:06:36,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:06:36,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1058793664] [2020-07-21 16:06:36,337 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:37,438 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:06:37,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:06:37,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 1516 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:06:37,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:06:37,940 INFO L134 CoverageAnalysis]: Checked inductivity of 13662 backedges. 1269 proven. 488 refuted. 0 times theorem prover too weak. 11905 trivial. 0 not checked. [2020-07-21 16:06:37,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:06:43,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:43,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:44,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:46,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:46,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:47,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:47,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:48,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:53,580 INFO L134 CoverageAnalysis]: Checked inductivity of 13662 backedges. 1273 proven. 508 refuted. 0 times theorem prover too weak. 11881 trivial. 0 not checked. [2020-07-21 16:06:53,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1058793664] [2020-07-21 16:06:53,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:06:53,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:06:53,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585598448] [2020-07-21 16:06:53,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:06:53,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:06:53,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:06:53,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:06:53,583 INFO L87 Difference]: Start difference. First operand 307 states and 537 transitions. Second operand 20 states. [2020-07-21 16:06:54,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:06:54,654 INFO L93 Difference]: Finished difference Result 329 states and 588 transitions. [2020-07-21 16:06:54,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:06:54,659 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 679 [2020-07-21 16:06:54,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:06:54,663 INFO L225 Difference]: With dead ends: 329 [2020-07-21 16:06:54,663 INFO L226 Difference]: Without dead ends: 325 [2020-07-21 16:06:54,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1365 GetRequests, 1326 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:06:54,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2020-07-21 16:06:54,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 304. [2020-07-21 16:06:54,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-21 16:06:54,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 528 transitions. [2020-07-21 16:06:54,682 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 528 transitions. Word has length 679 [2020-07-21 16:06:54,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:06:54,683 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 528 transitions. [2020-07-21 16:06:54,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:06:54,683 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 528 transitions. [2020-07-21 16:06:54,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 644 [2020-07-21 16:06:54,687 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:06:54,687 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 48, 48, 27, 27, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 22, 21, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:06:54,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:54,888 INFO L427 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:06:54,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:06:54,889 INFO L82 PathProgramCache]: Analyzing trace with hash 1360354941, now seen corresponding path program 58 times [2020-07-21 16:06:54,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:06:54,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [536086449] [2020-07-21 16:06:54,890 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:56,075 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:06:56,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:06:56,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 1435 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:06:56,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:06:56,475 INFO L134 CoverageAnalysis]: Checked inductivity of 12126 backedges. 782 proven. 867 refuted. 0 times theorem prover too weak. 10477 trivial. 0 not checked. [2020-07-21 16:06:56,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:04,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:04,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:05,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:05,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:06,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:06,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:07,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:07,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:07,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:07,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:08,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:10,045 INFO L134 CoverageAnalysis]: Checked inductivity of 12126 backedges. 786 proven. 887 refuted. 0 times theorem prover too weak. 10453 trivial. 0 not checked. [2020-07-21 16:07:10,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [536086449] [2020-07-21 16:07:10,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:10,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:07:10,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602273835] [2020-07-21 16:07:10,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:07:10,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:10,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:07:10,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:07:10,047 INFO L87 Difference]: Start difference. First operand 304 states and 528 transitions. Second operand 20 states. [2020-07-21 16:07:10,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:10,802 INFO L93 Difference]: Finished difference Result 326 states and 574 transitions. [2020-07-21 16:07:10,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:07:10,808 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 643 [2020-07-21 16:07:10,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:10,811 INFO L225 Difference]: With dead ends: 326 [2020-07-21 16:07:10,812 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 16:07:10,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1292 GetRequests, 1253 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:07:10,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 16:07:10,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 291. [2020-07-21 16:07:10,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291 states. [2020-07-21 16:07:10,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 493 transitions. [2020-07-21 16:07:10,829 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 493 transitions. Word has length 643 [2020-07-21 16:07:10,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:10,830 INFO L479 AbstractCegarLoop]: Abstraction has 291 states and 493 transitions. [2020-07-21 16:07:10,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:07:10,830 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 493 transitions. [2020-07-21 16:07:10,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 680 [2020-07-21 16:07:10,834 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:10,835 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 51, 51, 27, 27, 26, 26, 26, 26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 25, 25, 24, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:11,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:11,036 INFO L427 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:11,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:11,037 INFO L82 PathProgramCache]: Analyzing trace with hash 518404676, now seen corresponding path program 59 times [2020-07-21 16:07:11,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:11,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [13953635] [2020-07-21 16:07:11,038 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:12,226 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:07:12,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:12,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 1516 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:07:12,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:12,661 INFO L134 CoverageAnalysis]: Checked inductivity of 13606 backedges. 786 proven. 715 refuted. 0 times theorem prover too weak. 12105 trivial. 0 not checked. [2020-07-21 16:07:12,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:20,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:20,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:21,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:21,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:22,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:22,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:22,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:22,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:22,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:22,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:23,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:24,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:27,904 INFO L134 CoverageAnalysis]: Checked inductivity of 13606 backedges. 790 proven. 727 refuted. 0 times theorem prover too weak. 12089 trivial. 0 not checked. [2020-07-21 16:07:27,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [13953635] [2020-07-21 16:07:27,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:27,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:07:27,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519886883] [2020-07-21 16:07:27,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:07:27,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:27,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:07:27,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:07:27,907 INFO L87 Difference]: Start difference. First operand 291 states and 493 transitions. Second operand 18 states. [2020-07-21 16:07:28,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:28,775 INFO L93 Difference]: Finished difference Result 342 states and 634 transitions. [2020-07-21 16:07:28,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:07:28,781 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 679 [2020-07-21 16:07:28,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:28,785 INFO L225 Difference]: With dead ends: 342 [2020-07-21 16:07:28,785 INFO L226 Difference]: Without dead ends: 338 [2020-07-21 16:07:28,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1363 GetRequests, 1329 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:07:28,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2020-07-21 16:07:28,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 288. [2020-07-21 16:07:28,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 16:07:28,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 485 transitions. [2020-07-21 16:07:28,819 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 485 transitions. Word has length 679 [2020-07-21 16:07:28,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:28,820 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 485 transitions. [2020-07-21 16:07:28,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:07:28,820 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 485 transitions. [2020-07-21 16:07:28,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 692 [2020-07-21 16:07:28,828 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:28,829 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 50, 50, 28, 27, 27, 27, 27, 27, 27, 27, 27, 27, 25, 25, 25, 25, 25, 25, 25, 23, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:29,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:29,043 INFO L427 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:29,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:29,044 INFO L82 PathProgramCache]: Analyzing trace with hash -2042237011, now seen corresponding path program 8 times [2020-07-21 16:07:29,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:29,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [614050214] [2020-07-21 16:07:29,045 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:30,285 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:07:30,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:30,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 1543 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:07:30,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:30,851 INFO L134 CoverageAnalysis]: Checked inductivity of 14146 backedges. 326 proven. 1932 refuted. 0 times theorem prover too weak. 11888 trivial. 0 not checked. [2020-07-21 16:07:30,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:33,691 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:07:33,803 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:07:33,922 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:07:34,035 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:07:34,768 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:07:34,894 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:07:35,025 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:07:35,157 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:07:35,289 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 16:07:35,409 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 16:07:35,519 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 16:07:35,622 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 16:07:42,028 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:07:42,136 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:07:42,247 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:07:42,369 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:07:42,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:46,957 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:07:47,062 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:07:47,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:49,029 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2020-07-21 16:07:50,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:52,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:53,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:53,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:54,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:54,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:54,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:54,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:54,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:55,219 INFO L134 CoverageAnalysis]: Checked inductivity of 14146 backedges. 326 proven. 1972 refuted. 0 times theorem prover too weak. 11848 trivial. 0 not checked. [2020-07-21 16:07:55,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [614050214] [2020-07-21 16:07:55,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:55,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-21 16:07:55,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851287151] [2020-07-21 16:07:55,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 16:07:55,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:55,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 16:07:55,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:07:55,222 INFO L87 Difference]: Start difference. First operand 288 states and 485 transitions. Second operand 24 states. [2020-07-21 16:07:56,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:56,748 INFO L93 Difference]: Finished difference Result 298 states and 503 transitions. [2020-07-21 16:07:56,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:07:56,754 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 691 [2020-07-21 16:07:56,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:56,757 INFO L225 Difference]: With dead ends: 298 [2020-07-21 16:07:56,757 INFO L226 Difference]: Without dead ends: 294 [2020-07-21 16:07:56,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1391 GetRequests, 1342 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:07:56,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-21 16:07:56,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 266. [2020-07-21 16:07:56,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 266 states. [2020-07-21 16:07:56,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 431 transitions. [2020-07-21 16:07:56,773 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 431 transitions. Word has length 691 [2020-07-21 16:07:56,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:56,774 INFO L479 AbstractCegarLoop]: Abstraction has 266 states and 431 transitions. [2020-07-21 16:07:56,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 16:07:56,774 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 431 transitions. [2020-07-21 16:07:56,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1215 [2020-07-21 16:07:56,785 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:56,785 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 90, 90, 55, 54, 46, 46, 46, 46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 45, 38, 36, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:56,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:56,986 INFO L427 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:56,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:56,988 INFO L82 PathProgramCache]: Analyzing trace with hash 774715164, now seen corresponding path program 60 times [2020-07-21 16:07:56,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:56,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152356942] [2020-07-21 16:07:56,989 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:58,297 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:07:58,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:58,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 1789 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:07:58,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:59,661 INFO L134 CoverageAnalysis]: Checked inductivity of 44148 backedges. 16972 proven. 2801 refuted. 0 times theorem prover too weak. 24375 trivial. 0 not checked. [2020-07-21 16:07:59,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:08:04,500 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:08:04,602 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:08:04,712 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:08:04,822 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:08:10,956 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:08:11,061 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:08:11,173 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:08:11,286 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:08:12,117 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:08:12,222 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:08:12,348 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:08:12,472 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:08:15,613 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:08:15,716 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:08:15,826 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:08:15,934 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:08:16,040 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 16:08:22,836 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:08:22,940 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:08:23,046 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:08:23,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:26,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:26,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:28,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:30,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:30,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:31,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:31,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:31,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:31,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:36,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:36,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:37,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:38,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:38,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:38,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:38,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:38,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:39,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:42,375 INFO L134 CoverageAnalysis]: Checked inductivity of 44148 backedges. 2276 proven. 4236 refuted. 0 times theorem prover too weak. 37636 trivial. 0 not checked. [2020-07-21 16:08:42,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152356942] [2020-07-21 16:08:42,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:08:42,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 35 [2020-07-21 16:08:42,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899500156] [2020-07-21 16:08:42,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:08:42,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:08:42,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:08:42,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1060, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:08:42,378 INFO L87 Difference]: Start difference. First operand 266 states and 431 transitions. Second operand 35 states. [2020-07-21 16:08:49,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:08:49,795 INFO L93 Difference]: Finished difference Result 674 states and 1263 transitions. [2020-07-21 16:08:49,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-21 16:08:49,801 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 1214 [2020-07-21 16:08:49,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:08:49,807 INFO L225 Difference]: With dead ends: 674 [2020-07-21 16:08:49,808 INFO L226 Difference]: Without dead ends: 414 [2020-07-21 16:08:49,810 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2462 GetRequests, 2369 SyntacticMatches, 25 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1096 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=710, Invalid=4120, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 16:08:49,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2020-07-21 16:08:49,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 346. [2020-07-21 16:08:49,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 346 states. [2020-07-21 16:08:49,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 614 transitions. [2020-07-21 16:08:49,836 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 614 transitions. Word has length 1214 [2020-07-21 16:08:49,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:08:49,836 INFO L479 AbstractCegarLoop]: Abstraction has 346 states and 614 transitions. [2020-07-21 16:08:49,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:08:49,836 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 614 transitions. [2020-07-21 16:08:49,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1155 [2020-07-21 16:08:49,848 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:08:49,848 INFO L422 BasicCegarLoop]: trace histogram [87, 87, 86, 86, 55, 54, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 32, 32, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:08:50,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:50,049 INFO L427 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:08:50,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:08:50,051 INFO L82 PathProgramCache]: Analyzing trace with hash -321685029, now seen corresponding path program 61 times [2020-07-21 16:08:50,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:08:50,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [653673609] [2020-07-21 16:08:50,052 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:51,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:08:51,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:08:51,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 1701 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 16:08:51,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:08:52,894 INFO L134 CoverageAnalysis]: Checked inductivity of 39724 backedges. 2300 proven. 3980 refuted. 0 times theorem prover too weak. 33444 trivial. 0 not checked. [2020-07-21 16:08:52,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:08:55,231 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:08:58,325 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:08:58,429 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:08:59,387 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:08:59,496 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:08:59,614 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:08:59,726 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:09:03,256 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:09:03,368 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:09:03,488 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:09:03,607 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:09:03,719 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:09:03,822 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:09:10,259 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:09:10,364 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:09:10,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:10,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:14,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:16,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:16,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:18,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:18,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:18,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:18,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:18,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:19,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:21,884 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:09:21,989 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:09:22,802 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:09:22,914 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:09:23,036 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:09:23,156 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:09:23,264 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:09:29,229 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:09:29,336 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:09:29,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:33,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:33,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:34,719 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-21 16:09:35,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:36,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:36,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:37,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:37,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:37,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:37,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:38,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:38,955 INFO L134 CoverageAnalysis]: Checked inductivity of 39724 backedges. 2304 proven. 4024 refuted. 0 times theorem prover too weak. 33396 trivial. 0 not checked. [2020-07-21 16:09:38,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [653673609] [2020-07-21 16:09:38,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:09:38,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31] total 35 [2020-07-21 16:09:38,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900932935] [2020-07-21 16:09:38,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:09:38,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:09:38,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:09:38,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1059, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:09:38,958 INFO L87 Difference]: Start difference. First operand 346 states and 614 transitions. Second operand 35 states. [2020-07-21 16:09:48,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:09:48,231 INFO L93 Difference]: Finished difference Result 861 states and 1756 transitions. [2020-07-21 16:09:48,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 16:09:48,238 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 1154 [2020-07-21 16:09:48,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:09:48,246 INFO L225 Difference]: With dead ends: 861 [2020-07-21 16:09:48,246 INFO L226 Difference]: Without dead ends: 503 [2020-07-21 16:09:48,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2343 GetRequests, 2245 SyntacticMatches, 29 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1142 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=739, Invalid=4231, Unknown=0, NotChecked=0, Total=4970 [2020-07-21 16:09:48,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 503 states. [2020-07-21 16:09:48,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 503 to 438. [2020-07-21 16:09:48,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 438 states. [2020-07-21 16:09:48,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 842 transitions. [2020-07-21 16:09:48,300 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 842 transitions. Word has length 1154 [2020-07-21 16:09:48,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:09:48,301 INFO L479 AbstractCegarLoop]: Abstraction has 438 states and 842 transitions. [2020-07-21 16:09:48,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:09:48,302 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 842 transitions. [2020-07-21 16:09:48,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1014 [2020-07-21 16:09:48,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:09:48,320 INFO L422 BasicCegarLoop]: trace histogram [79, 79, 74, 74, 44, 44, 39, 39, 39, 39, 39, 39, 39, 37, 37, 37, 37, 37, 37, 37, 35, 30, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:09:48,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:09:48,535 INFO L427 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:09:48,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:09:48,536 INFO L82 PathProgramCache]: Analyzing trace with hash 552101171, now seen corresponding path program 62 times [2020-07-21 16:09:48,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:09:48,537 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [306004565] [2020-07-21 16:09:48,537 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 87 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:09:50,035 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:09:50,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:09:50,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 2259 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:09:50,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:09:50,902 INFO L134 CoverageAnalysis]: Checked inductivity of 30648 backedges. 491 proven. 2970 refuted. 0 times theorem prover too weak. 27187 trivial. 0 not checked. [2020-07-21 16:09:50,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:09:54,168 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:09:54,298 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:09:54,434 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:09:54,698 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:09:56,061 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:09:56,194 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:09:56,339 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:09:56,483 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:09:56,623 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 16:09:56,754 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 16:09:56,879 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 16:09:56,999 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 16:09:57,104 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:10:05,169 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:05,304 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:05,422 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:06,154 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:06,285 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:06,416 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:06,558 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:06,694 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:10:06,815 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 16:10:06,939 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:10:07,046 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:10:07,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:07,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:14,079 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:14,201 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:14,332 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:14,464 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:14,589 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:10:14,702 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 16:10:14,809 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 16:10:15,015 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:15,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:15,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:19,618 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 16:10:19,726 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 16:10:19,839 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:10:19,954 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:10:20,064 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 16:10:20,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:20,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:22,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:22,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:24,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:24,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:25,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:25,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:25,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:25,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:25,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:25,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:26,589 INFO L134 CoverageAnalysis]: Checked inductivity of 30648 backedges. 491 proven. 3014 refuted. 0 times theorem prover too weak. 27143 trivial. 0 not checked. [2020-07-21 16:10:26,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [306004565] [2020-07-21 16:10:26,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:26,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-21 16:10:26,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349673828] [2020-07-21 16:10:26,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 16:10:26,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:26,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 16:10:26,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:10:26,593 INFO L87 Difference]: Start difference. First operand 438 states and 842 transitions. Second operand 24 states. [2020-07-21 16:10:28,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:28,607 INFO L93 Difference]: Finished difference Result 523 states and 1119 transitions. [2020-07-21 16:10:28,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:10:28,615 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1013 [2020-07-21 16:10:28,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:28,623 INFO L225 Difference]: With dead ends: 523 [2020-07-21 16:10:28,623 INFO L226 Difference]: Without dead ends: 519 [2020-07-21 16:10:28,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2034 GetRequests, 1985 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:10:28,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2020-07-21 16:10:28,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 487. [2020-07-21 16:10:28,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 487 states. [2020-07-21 16:10:28,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 982 transitions. [2020-07-21 16:10:28,660 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 982 transitions. Word has length 1013 [2020-07-21 16:10:28,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:28,662 INFO L479 AbstractCegarLoop]: Abstraction has 487 states and 982 transitions. [2020-07-21 16:10:28,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 16:10:28,662 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 982 transitions. [2020-07-21 16:10:28,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 773 [2020-07-21 16:10:28,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:28,673 INFO L422 BasicCegarLoop]: trace histogram [59, 59, 56, 56, 38, 37, 29, 29, 29, 29, 29, 29, 29, 28, 28, 28, 28, 28, 28, 28, 21, 19, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:10:28,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:28,888 INFO L427 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:28,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:28,889 INFO L82 PathProgramCache]: Analyzing trace with hash 417674432, now seen corresponding path program 63 times [2020-07-21 16:10:28,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:28,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230582546] [2020-07-21 16:10:28,889 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 88 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:30,265 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:10:30,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:30,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 1142 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 16:10:30,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:31,508 INFO L134 CoverageAnalysis]: Checked inductivity of 17509 backedges. 1843 proven. 2152 refuted. 0 times theorem prover too weak. 13514 trivial. 0 not checked. [2020-07-21 16:10:31,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:33,936 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:10:34,041 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:10:34,151 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:10:34,261 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:10:35,047 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:10:35,170 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:10:35,295 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:35,417 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:37,031 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 16:10:37,140 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 16:10:37,258 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:10:37,372 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:10:37,838 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:37,954 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:38,081 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:38,206 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:39,889 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 16:10:40,096 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:10:40,205 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:10:40,632 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:40,744 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:40,864 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:40,990 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:41,121 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:10:41,229 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:10:41,335 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:44,312 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:10:44,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:46,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:46,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:46,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:46,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:47,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:47,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:47,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:47,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:48,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:48,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:51,719 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:10:51,833 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:10:51,988 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:52,119 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:52,237 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:10:52,343 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 16:10:58,511 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:10:58,624 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:10:58,744 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:10:58,866 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:10:58,981 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:59,084 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:59,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:59,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:03,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:05,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:05,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:06,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:06,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:07,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:07,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:08,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:08,766 INFO L134 CoverageAnalysis]: Checked inductivity of 17509 backedges. 1847 proven. 2193 refuted. 0 times theorem prover too weak. 13469 trivial. 0 not checked. [2020-07-21 16:11:08,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230582546] [2020-07-21 16:11:08,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:11:08,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31] total 35 [2020-07-21 16:11:08,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932282273] [2020-07-21 16:11:08,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:11:08,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:11:08,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:11:08,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1056, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:11:08,770 INFO L87 Difference]: Start difference. First operand 487 states and 982 transitions. Second operand 35 states. [2020-07-21 16:11:16,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:11:16,561 INFO L93 Difference]: Finished difference Result 1028 states and 2107 transitions. [2020-07-21 16:11:16,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 16:11:16,569 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 772 [2020-07-21 16:11:16,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:11:16,577 INFO L225 Difference]: With dead ends: 1028 [2020-07-21 16:11:16,577 INFO L226 Difference]: Without dead ends: 529 [2020-07-21 16:11:16,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1570 GetRequests, 1481 SyntacticMatches, 29 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=560, Invalid=3222, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 16:11:16,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2020-07-21 16:11:16,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 419. [2020-07-21 16:11:16,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 419 states. [2020-07-21 16:11:16,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 694 transitions. [2020-07-21 16:11:16,610 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 694 transitions. Word has length 772 [2020-07-21 16:11:16,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:11:16,611 INFO L479 AbstractCegarLoop]: Abstraction has 419 states and 694 transitions. [2020-07-21 16:11:16,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:11:16,611 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 694 transitions. [2020-07-21 16:11:16,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 762 [2020-07-21 16:11:16,617 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:11:16,618 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 55, 55, 44, 44, 28, 28, 28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 27, 17, 16, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:11:16,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:16,820 INFO L427 AbstractCegarLoop]: === Iteration 88 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:11:16,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:11:16,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1244461962, now seen corresponding path program 64 times [2020-07-21 16:11:16,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:11:16,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002277199] [2020-07-21 16:11:16,822 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 89 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:18,328 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:11:18,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:11:18,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 1692 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:11:18,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:11:19,000 INFO L134 CoverageAnalysis]: Checked inductivity of 16908 backedges. 379 proven. 1900 refuted. 0 times theorem prover too weak. 14629 trivial. 0 not checked. [2020-07-21 16:11:19,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:11:21,577 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:11:21,709 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:11:21,868 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:22,024 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:22,165 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:11:22,301 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 16:11:22,422 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:11:22,530 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:11:29,730 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:11:29,837 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:11:30,379 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:11:30,494 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:11:30,618 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:30,737 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:31,591 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:31,724 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:31,868 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:32,012 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:32,144 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:11:32,266 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 16:11:32,380 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:32,484 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:32,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:32,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:37,937 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:11:38,046 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:11:38,153 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:38,263 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:38,367 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:38,472 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:38,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:41,798 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:11:41,903 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:11:42,015 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:42,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:42,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:44,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:45,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:45,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:46,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:46,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:46,596 INFO L134 CoverageAnalysis]: Checked inductivity of 16908 backedges. 379 proven. 1933 refuted. 0 times theorem prover too weak. 14596 trivial. 0 not checked. [2020-07-21 16:11:46,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002277199] [2020-07-21 16:11:46,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:11:46,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:11:46,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495468518] [2020-07-21 16:11:46,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:11:46,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:11:46,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:11:46,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:11:46,599 INFO L87 Difference]: Start difference. First operand 419 states and 694 transitions. Second operand 22 states. [2020-07-21 16:11:48,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:11:48,350 INFO L93 Difference]: Finished difference Result 431 states and 713 transitions. [2020-07-21 16:11:48,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:11:48,359 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 761 [2020-07-21 16:11:48,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:11:48,363 INFO L225 Difference]: With dead ends: 431 [2020-07-21 16:11:48,364 INFO L226 Difference]: Without dead ends: 427 [2020-07-21 16:11:48,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1529 GetRequests, 1485 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:11:48,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2020-07-21 16:11:48,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 387. [2020-07-21 16:11:48,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 387 states. [2020-07-21 16:11:48,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 629 transitions. [2020-07-21 16:11:48,390 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 629 transitions. Word has length 761 [2020-07-21 16:11:48,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:11:48,390 INFO L479 AbstractCegarLoop]: Abstraction has 387 states and 629 transitions. [2020-07-21 16:11:48,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:11:48,391 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 629 transitions. [2020-07-21 16:11:48,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1119 [2020-07-21 16:11:48,402 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:11:48,402 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 83, 83, 55, 54, 42, 42, 42, 42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 41, 30, 28, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:11:48,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:48,604 INFO L427 AbstractCegarLoop]: === Iteration 89 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:11:48,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:11:48,605 INFO L82 PathProgramCache]: Analyzing trace with hash -585325362, now seen corresponding path program 65 times [2020-07-21 16:11:48,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:11:48,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411987744] [2020-07-21 16:11:48,606 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 90 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:50,270 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:11:50,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:11:50,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 1653 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 16:11:50,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:11:51,817 INFO L134 CoverageAnalysis]: Checked inductivity of 37196 backedges. 2250 proven. 3827 refuted. 0 times theorem prover too weak. 31119 trivial. 0 not checked. [2020-07-21 16:11:51,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:11:53,649 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:11:53,756 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:11:54,426 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:11:55,621 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:55,742 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:55,872 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:56,002 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:12:00,084 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:00,192 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:00,790 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:00,902 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:01,028 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:01,145 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:02,124 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:02,257 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:02,397 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:12:02,536 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:12:02,661 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:12:02,778 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:12:02,886 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:12:02,996 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:12:03,915 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 16:12:09,102 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:09,211 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:09,899 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:10,017 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:10,148 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:10,276 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:10,398 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:12:10,507 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:12:10,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:10,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:14,759 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:14,868 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:15,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:17,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:17,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:18,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:18,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:19,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:19,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:19,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:19,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:21,266 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 16:12:21,377 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 16:12:21,490 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:21,598 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:22,287 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:22,404 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:22,529 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:22,655 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:23,744 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:23,872 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:24,008 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:12:24,153 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:12:24,285 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:12:24,400 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:12:24,513 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:12:24,623 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:12:24,727 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:30,944 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:31,577 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:31,696 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:31,831 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:31,961 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:32,082 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:12:32,191 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:12:32,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:36,391 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:36,501 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:36,612 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:36,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:39,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:39,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:40,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:40,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:40,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:40,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:40,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:40,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:40,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:41,739 INFO L134 CoverageAnalysis]: Checked inductivity of 37196 backedges. 2254 proven. 3871 refuted. 0 times theorem prover too weak. 31071 trivial. 0 not checked. [2020-07-21 16:12:41,739 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411987744] [2020-07-21 16:12:41,739 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:12:41,739 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31] total 35 [2020-07-21 16:12:41,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456635621] [2020-07-21 16:12:41,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:12:41,740 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:12:41,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:12:41,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1059, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:12:41,741 INFO L87 Difference]: Start difference. First operand 387 states and 629 transitions. Second operand 35 states. [2020-07-21 16:12:51,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:12:51,745 INFO L93 Difference]: Finished difference Result 1057 states and 2028 transitions. [2020-07-21 16:12:51,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 16:12:51,753 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 1118 [2020-07-21 16:12:51,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:12:51,763 INFO L225 Difference]: With dead ends: 1057 [2020-07-21 16:12:51,764 INFO L226 Difference]: Without dead ends: 652 [2020-07-21 16:12:51,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2269 GetRequests, 2173 SyntacticMatches, 29 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1067 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=703, Invalid=3989, Unknown=0, NotChecked=0, Total=4692 [2020-07-21 16:12:51,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2020-07-21 16:12:51,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 491. [2020-07-21 16:12:51,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 491 states. [2020-07-21 16:12:51,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 835 transitions. [2020-07-21 16:12:51,801 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 835 transitions. Word has length 1118 [2020-07-21 16:12:51,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:12:51,801 INFO L479 AbstractCegarLoop]: Abstraction has 491 states and 835 transitions. [2020-07-21 16:12:51,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:12:51,801 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 835 transitions. [2020-07-21 16:12:51,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 930 [2020-07-21 16:12:51,811 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:12:51,811 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 62, 62, 44, 44, 38, 38, 38, 38, 38, 38, 38, 33, 31, 31, 31, 31, 31, 31, 31, 18, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:12:52,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:12:52,012 INFO L427 AbstractCegarLoop]: === Iteration 90 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:12:52,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:12:52,013 INFO L82 PathProgramCache]: Analyzing trace with hash -149916948, now seen corresponding path program 66 times [2020-07-21 16:12:52,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:12:52,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1151722633] [2020-07-21 16:12:52,014 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 91 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:12:53,634 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:12:53,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:12:53,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 2070 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:12:53,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:12:54,386 INFO L134 CoverageAnalysis]: Checked inductivity of 25832 backedges. 516 proven. 2279 refuted. 0 times theorem prover too weak. 23037 trivial. 0 not checked. [2020-07-21 16:12:54,386 INFO L328 TraceCheckSpWp]: Computing backward predicates...