/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 BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_20-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:06:45,489 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:06:45,493 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:06:45,507 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:06:45,507 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:06:45,508 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:06:45,509 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:06:45,511 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:06:45,513 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:06:45,514 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:06:45,516 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:06:45,517 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:06:45,517 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:06:45,519 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:06:45,520 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:06:45,522 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:06:45,523 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:06:45,524 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:06:45,526 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:06:45,529 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:06:45,531 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:06:45,533 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:06:45,534 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:06:45,535 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:06:45,538 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:06:45,549 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:06:45,550 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:06:45,551 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:06:45,552 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 22:06:45,569 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:06:45,569 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:06:45,571 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:06:45,571 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:06:45,571 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:06:45,571 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:06:45,572 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:06:45,572 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:06:45,572 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:06:45,572 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:06:45,572 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:06:45,573 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:06:45,573 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:06:45,573 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:06:45,573 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:06:45,573 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:06:45,574 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:06:45,574 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:06:45,574 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:06:45,574 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:06:45,574 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:06:45,575 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:06:45,575 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:06:45,575 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:06:45,575 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:06:45,576 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:06:45,576 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:45,576 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:06:45,576 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:06:45,576 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 -> BIGGEST_EQUIVALENCE_CLASS 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 -> 4 [2020-07-21 22:06:45,912 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:06:45,942 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:06:45,947 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:06:45,949 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:06:45,949 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:06:45,952 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_20-2.c [2020-07-21 22:06:46,048 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bb5e796b9/554275342dd847729b8d435d44ea52a2/FLAG262d2e9b7 [2020-07-21 22:06:46,584 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:06:46,585 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_20-2.c [2020-07-21 22:06:46,595 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bb5e796b9/554275342dd847729b8d435d44ea52a2/FLAG262d2e9b7 [2020-07-21 22:06:46,940 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bb5e796b9/554275342dd847729b8d435d44ea52a2 [2020-07-21 22:06:46,950 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:06:46,954 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:06:46,955 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:06:46,955 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:06:46,961 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:06:46,962 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:06:46" (1/1) ... [2020-07-21 22:06:46,966 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f2c4696 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:06:46, skipping insertion in model container [2020-07-21 22:06:46,966 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:06:46" (1/1) ... [2020-07-21 22:06:46,975 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:06:46,997 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:06:47,279 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:06:47,289 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:06:47,313 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:06:47,331 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:06:47,331 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:06:47 WrapperNode [2020-07-21 22:06:47,331 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:06:47,333 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:06:47,334 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:06:47,334 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:06:47,347 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:06:47" (1/1) ... [2020-07-21 22:06:47,347 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:06:47" (1/1) ... [2020-07-21 22:06:47,353 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:06:47" (1/1) ... [2020-07-21 22:06:47,353 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:06:47" (1/1) ... [2020-07-21 22:06:47,357 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:06:47" (1/1) ... [2020-07-21 22:06:47,359 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:06:47" (1/1) ... [2020-07-21 22:06:47,360 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:06:47" (1/1) ... [2020-07-21 22:06:47,361 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:06:47,362 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:06:47,362 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:06:47,362 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:06:47,363 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:06:47" (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 22:06:47,520 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:06:47,520 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:06:47,521 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 22:06:47,521 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:06:47,521 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:06:47,521 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:06:47,521 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 22:06:47,521 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:06:47,521 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:06:47,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:06:47,712 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:06:47,713 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:06:47,717 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:06:47 BoogieIcfgContainer [2020-07-21 22:06:47,717 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:06:47,718 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:06:47,718 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:06:47,722 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:06:47,722 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:06:46" (1/3) ... [2020-07-21 22:06:47,723 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6caaf53a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:06:47, skipping insertion in model container [2020-07-21 22:06:47,723 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:06:47" (2/3) ... [2020-07-21 22:06:47,724 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6caaf53a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:06:47, skipping insertion in model container [2020-07-21 22:06:47,724 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:06:47" (3/3) ... [2020-07-21 22:06:47,725 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_20-2.c [2020-07-21 22:06:47,734 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:06:47,743 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:06:47,759 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:06:47,788 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:06:47,788 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:06:47,788 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:06:47,788 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:06:47,791 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:06:47,792 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:06:47,792 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:06:47,792 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:06:47,813 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 22:06:47,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:06:47,821 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:47,822 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:47,823 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:47,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:47,829 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 22:06:47,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:47,839 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2008639503] [2020-07-21 22:06:47,839 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:06:47,924 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:06:47,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:47,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:06:47,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:48,029 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 22:06:48,029 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:06:48,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2008639503] [2020-07-21 22:06:48,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:06:48,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:06:48,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144203111] [2020-07-21 22:06:48,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:06:48,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:48,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:06:48,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:06:48,078 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 22:06:48,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:48,227 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 22:06:48,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:06:48,229 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:06:48,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:48,242 INFO L225 Difference]: With dead ends: 35 [2020-07-21 22:06:48,242 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 22:06:48,246 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 22:06:48,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 22:06:48,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 22:06:48,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:06:48,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:06:48,303 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 22:06:48,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:48,304 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:06:48,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:06:48,304 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:06:48,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:06:48,306 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:48,307 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:48,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:48,523 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:48,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:48,524 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 22:06:48,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:48,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091731723] [2020-07-21 22:06:48,526 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:06:48,553 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:06:48,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:48,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:06:48,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:48,595 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 22:06:48,596 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:06:48,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091731723] [2020-07-21 22:06:48,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:06:48,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:06:48,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499918741] [2020-07-21 22:06:48,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:06:48,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:48,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:06:48,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:06:48,601 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 22:06:48,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:48,673 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 22:06:48,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:06:48,674 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 22:06:48,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:48,676 INFO L225 Difference]: With dead ends: 27 [2020-07-21 22:06:48,677 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 22:06:48,678 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 22:06:48,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 22:06:48,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 22:06:48,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:06:48,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:06:48,687 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 22:06:48,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:48,688 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:06:48,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:06:48,688 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:06:48,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:06:48,690 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:48,690 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:48,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:48,905 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:48,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:48,906 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 22:06:48,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:48,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103810022] [2020-07-21 22:06:48,907 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:06:48,943 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:06:48,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:48,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:06:48,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:49,023 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:06:49,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:49,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:49,309 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:06:49,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103810022] [2020-07-21 22:06:49,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:49,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:06:49,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542579925] [2020-07-21 22:06:49,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:06:49,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:49,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:06:49,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:06:49,313 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 22:06:49,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:49,453 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 22:06:49,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:06:49,454 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 22:06:49,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:49,456 INFO L225 Difference]: With dead ends: 32 [2020-07-21 22:06:49,457 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 22:06:49,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:06:49,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 22:06:49,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 22:06:49,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:06:49,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:06:49,468 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 22:06:49,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:49,468 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:06:49,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:06:49,469 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:06:49,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:06:49,470 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:49,471 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:49,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:49,684 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:49,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:49,685 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 22:06:49,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:49,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1678913540] [2020-07-21 22:06:49,687 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:06:49,711 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:06:49,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:49,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:06:49,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:49,760 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 22:06:49,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:49,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:49,951 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:06:49,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1678913540] [2020-07-21 22:06:49,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:49,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:06:49,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076174302] [2020-07-21 22:06:49,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:06:49,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:49,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:06:49,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:06:49,957 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 22:06:50,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:50,090 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 22:06:50,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:06:50,091 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 22:06:50,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:50,094 INFO L225 Difference]: With dead ends: 37 [2020-07-21 22:06:50,094 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 22:06:50,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:06:50,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 22:06:50,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 22:06:50,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:06:50,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:06:50,119 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 22:06:50,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:50,122 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:06:50,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:06:50,122 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:06:50,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 22:06:50,125 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:50,126 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:50,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:50,342 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:50,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:50,343 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 22:06:50,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:50,344 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1219875525] [2020-07-21 22:06:50,344 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:06:50,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:06:50,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:50,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:06:50,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:50,424 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 22:06:50,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:50,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:50,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:50,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:50,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:50,729 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 22:06:50,730 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1219875525] [2020-07-21 22:06:50,730 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:50,730 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:06:50,731 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669560669] [2020-07-21 22:06:50,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:06:50,731 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:50,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:06:50,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:06:50,732 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 22:06:50,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:50,888 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 22:06:50,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:06:50,895 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 22:06:50,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:50,898 INFO L225 Difference]: With dead ends: 42 [2020-07-21 22:06:50,898 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 22:06:50,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:06:50,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 22:06:50,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 22:06:50,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:06:50,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:06:50,911 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 22:06:50,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:50,912 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:06:50,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:06:50,912 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:06:50,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 22:06:50,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:50,914 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:51,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:51,118 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:51,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:51,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 22:06:51,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:51,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [788346356] [2020-07-21 22:06:51,120 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:06:51,157 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:06:51,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:51,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:06:51,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:51,232 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 22:06:51,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:51,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:51,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:51,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:51,571 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 22:06:51,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [788346356] [2020-07-21 22:06:51,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:51,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:06:51,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587040819] [2020-07-21 22:06:51,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:06:51,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:51,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:06:51,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:06:51,574 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 22:06:51,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:51,715 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 22:06:51,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:06:51,716 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 22:06:51,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:51,718 INFO L225 Difference]: With dead ends: 47 [2020-07-21 22:06:51,719 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 22:06:51,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:06:51,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 22:06:51,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 22:06:51,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:06:51,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:06:51,736 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 22:06:51,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:51,737 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:06:51,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:06:51,738 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:06:51,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 22:06:51,747 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:51,747 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:51,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:51,948 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:51,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:51,949 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 22:06:51,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:51,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [528342867] [2020-07-21 22:06:51,950 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:06:51,987 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:06:51,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:51,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:06:51,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:52,048 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 22:06:52,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:52,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:52,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:52,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:52,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:52,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:52,668 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 22:06:52,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [528342867] [2020-07-21 22:06:52,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:52,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:06:52,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653203427] [2020-07-21 22:06:52,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:06:52,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:52,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:06:52,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:06:52,671 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 22:06:52,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:52,876 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 22:06:52,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:06:52,876 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 22:06:52,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:52,885 INFO L225 Difference]: With dead ends: 52 [2020-07-21 22:06:52,886 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 22:06:52,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:06:52,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 22:06:52,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 22:06:52,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:06:52,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:06:52,915 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 22:06:52,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:52,916 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:06:52,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:06:52,919 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:06:52,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 22:06:52,927 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:52,927 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:53,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:53,129 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:53,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:53,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 22:06:53,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:53,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174949682] [2020-07-21 22:06:53,131 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:06:53,174 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:53,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:53,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:06:53,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:53,239 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 22:06:53,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:53,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:53,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:53,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:53,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:53,903 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 22:06:53,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174949682] [2020-07-21 22:06:53,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:53,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:06:53,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451606357] [2020-07-21 22:06:53,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:06:53,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:53,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:06:53,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:06:53,906 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 22:06:54,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:54,068 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 22:06:54,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:06:54,070 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 22:06:54,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:54,073 INFO L225 Difference]: With dead ends: 57 [2020-07-21 22:06:54,073 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 22:06:54,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:06:54,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 22:06:54,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 22:06:54,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:06:54,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:06:54,087 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 22:06:54,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:54,088 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:06:54,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:06:54,089 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:06:54,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 22:06:54,091 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:54,091 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:54,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:54,306 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:54,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:54,307 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 22:06:54,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:54,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [27703292] [2020-07-21 22:06:54,307 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:06:54,354 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:54,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:54,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:06:54,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:54,448 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 22:06:54,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:55,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:55,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:55,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:55,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:55,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:55,478 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 22:06:55,478 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [27703292] [2020-07-21 22:06:55,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:55,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 22:06:55,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987123993] [2020-07-21 22:06:55,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:06:55,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:55,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:06:55,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:06:55,481 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 22:06:55,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:55,766 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 22:06:55,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:06:55,766 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 22:06:55,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:55,770 INFO L225 Difference]: With dead ends: 62 [2020-07-21 22:06:55,771 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 22:06:55,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:06:55,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 22:06:55,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 22:06:55,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:06:55,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 22:06:55,785 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 22:06:55,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:55,786 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 22:06:55,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:06:55,786 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 22:06:55,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 22:06:55,789 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:55,789 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:56,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:56,003 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:56,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:56,004 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 22:06:56,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:56,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1408673395] [2020-07-21 22:06:56,006 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:06:56,063 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:56,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:56,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:06:56,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:56,147 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 22:06:56,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:56,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:57,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:57,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:57,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:57,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:57,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:57,306 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 22:06:57,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1408673395] [2020-07-21 22:06:57,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:57,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 22:06:57,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774209739] [2020-07-21 22:06:57,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:06:57,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:57,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:06:57,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:06:57,309 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 22:06:57,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:06:57,491 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 22:06:57,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:06:57,492 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 22:06:57,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:06:57,496 INFO L225 Difference]: With dead ends: 67 [2020-07-21 22:06:57,496 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 22:06:57,497 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:06:57,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 22:06:57,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 22:06:57,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:06:57,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 22:06:57,509 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 22:06:57,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:06:57,510 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 22:06:57,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:06:57,510 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 22:06:57,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 22:06:57,514 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:06:57,514 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:06:57,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:06:57,720 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:06:57,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:06:57,720 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 22:06:57,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:06:57,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [195704759] [2020-07-21 22:06:57,722 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:06:57,814 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:06:57,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:06:57,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:06:57,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:06:57,934 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 22:06:57,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:06:59,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:59,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:59,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:59,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:59,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:59,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:06:59,881 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 22:06:59,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [195704759] [2020-07-21 22:06:59,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:06:59,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 22:06:59,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451118833] [2020-07-21 22:06:59,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:06:59,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:06:59,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:06:59,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:06:59,885 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 22:07:00,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:00,123 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 22:07:00,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:07:00,126 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 22:07:00,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:00,130 INFO L225 Difference]: With dead ends: 72 [2020-07-21 22:07:00,131 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 22:07:00,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:07:00,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 22:07:00,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 22:07:00,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 22:07:00,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 22:07:00,161 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 22:07:00,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:00,163 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 22:07:00,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:07:00,163 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 22:07:00,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-21 22:07:00,170 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:00,170 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:00,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:00,384 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:00,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:00,385 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-21 22:07:00,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:00,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130229050] [2020-07-21 22:07:00,386 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:07:00,472 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:00,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:00,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:07:00,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:00,662 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-21 22:07:00,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:01,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:02,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:02,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:02,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:02,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:02,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:02,534 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-21 22:07:02,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130229050] [2020-07-21 22:07:02,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:02,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 22:07:02,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87011605] [2020-07-21 22:07:02,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:07:02,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:02,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:07:02,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:07:02,537 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 22:07:02,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:02,819 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 22:07:02,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:07:02,820 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-21 22:07:02,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:02,828 INFO L225 Difference]: With dead ends: 77 [2020-07-21 22:07:02,829 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 22:07:02,830 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:07:02,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 22:07:02,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 22:07:02,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 22:07:02,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 22:07:02,851 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-21 22:07:02,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:02,852 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 22:07:02,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:07:02,852 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 22:07:02,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-21 22:07:02,864 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:02,864 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:03,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:03,080 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:03,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:03,080 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-21 22:07:03,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:03,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33161740] [2020-07-21 22:07:03,081 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:07:03,208 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:03,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:03,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:07:03,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:03,496 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-21 22:07:03,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:05,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:06,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:06,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:06,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:06,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:06,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:06,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:06,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:06,827 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-21 22:07:06,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33161740] [2020-07-21 22:07:06,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:06,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 22:07:06,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279379599] [2020-07-21 22:07:06,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:07:06,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:06,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:07:06,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:07:06,830 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 22:07:07,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:07,215 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 22:07:07,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:07:07,216 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-21 22:07:07,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:07,225 INFO L225 Difference]: With dead ends: 82 [2020-07-21 22:07:07,225 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 22:07:07,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 22:07:07,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 22:07:07,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 22:07:07,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 22:07:07,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 22:07:07,255 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-21 22:07:07,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:07,258 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 22:07:07,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:07:07,258 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 22:07:07,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 22:07:07,265 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:07,265 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:07,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:07,479 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:07,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:07,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 22:07:07,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:07,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1854477958] [2020-07-21 22:07:07,481 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:07:07,617 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:07,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:07,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:07:07,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:07,845 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 22:07:07,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:09,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:10,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:10,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:10,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:10,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:10,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:10,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:10,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:11,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:11,160 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 22:07:11,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1854477958] [2020-07-21 22:07:11,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:11,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 22:07:11,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091018180] [2020-07-21 22:07:11,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:07:11,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:11,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:07:11,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:07:11,164 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 22:07:11,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:11,704 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 22:07:11,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:07:11,706 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 22:07:11,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:11,712 INFO L225 Difference]: With dead ends: 87 [2020-07-21 22:07:11,713 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 22:07:11,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 22:07:11,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 22:07:11,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 22:07:11,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 22:07:11,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 22:07:11,760 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 22:07:11,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:11,761 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 22:07:11,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:07:11,761 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 22:07:11,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-21 22:07:11,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:11,771 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:11,985 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:11,986 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:11,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:11,987 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-21 22:07:11,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:11,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1414466575] [2020-07-21 22:07:11,987 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:07:12,230 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:12,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:12,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:07:12,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:12,644 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-21 22:07:12,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:15,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:15,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:16,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:17,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:17,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:17,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:17,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:18,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:18,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:18,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:18,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:18,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:18,632 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-21 22:07:18,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1414466575] [2020-07-21 22:07:18,633 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:18,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 22:07:18,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376184853] [2020-07-21 22:07:18,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:07:18,635 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:18,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:07:18,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:07:18,636 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 22:07:19,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:19,111 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 22:07:19,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:07:19,112 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-21 22:07:19,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:19,118 INFO L225 Difference]: With dead ends: 92 [2020-07-21 22:07:19,118 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 22:07:19,122 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:07:19,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 22:07:19,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 22:07:19,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 22:07:19,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 22:07:19,145 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-21 22:07:19,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:19,147 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 22:07:19,147 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:07:19,148 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 22:07:19,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1078 [2020-07-21 22:07:19,162 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:19,163 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 128, 78, 78, 78, 78, 78, 78, 78, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:19,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:19,377 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:19,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:19,378 INFO L82 PathProgramCache]: Analyzing trace with hash 860290653, now seen corresponding path program 7 times [2020-07-21 22:07:19,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:19,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [777244216] [2020-07-21 22:07:19,379 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:07:19,624 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:19,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:19,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:07:19,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:20,215 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5812 refuted. 0 times theorem prover too weak. 62481 trivial. 0 not checked. [2020-07-21 22:07:20,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:23,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:23,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:25,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:25,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:25,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:26,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:26,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:26,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:26,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:26,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:27,103 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5889 refuted. 0 times theorem prover too weak. 62404 trivial. 0 not checked. [2020-07-21 22:07:27,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [777244216] [2020-07-21 22:07:27,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:27,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 22:07:27,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961707722] [2020-07-21 22:07:27,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:07:27,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:27,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:07:27,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:07:27,113 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 22:07:27,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:27,689 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 22:07:27,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:07:27,690 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1077 [2020-07-21 22:07:27,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:27,698 INFO L225 Difference]: With dead ends: 97 [2020-07-21 22:07:27,699 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 22:07:27,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2161 GetRequests, 2118 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:07:27,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 22:07:27,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 22:07:27,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 22:07:27,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 22:07:27,718 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1077 [2020-07-21 22:07:27,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:27,720 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 22:07:27,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:07:27,720 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 22:07:27,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1574 [2020-07-21 22:07:27,743 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:27,744 INFO L422 BasicCegarLoop]: trace histogram [241, 241, 121, 120, 120, 120, 120, 120, 120, 120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:27,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:27,957 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:27,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:27,958 INFO L82 PathProgramCache]: Analyzing trace with hash 78333505, now seen corresponding path program 8 times [2020-07-21 22:07:27,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:27,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1544100308] [2020-07-21 22:07:27,959 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:07:28,306 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:28,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:28,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 876 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 22:07:28,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:29,408 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9337 refuted. 0 times theorem prover too weak. 140480 trivial. 0 not checked. [2020-07-21 22:07:29,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:34,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:36,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:37,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:38,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:38,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:38,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:38,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:39,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:39,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:39,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:39,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:39,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:40,290 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9429 refuted. 0 times theorem prover too weak. 140388 trivial. 0 not checked. [2020-07-21 22:07:40,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1544100308] [2020-07-21 22:07:40,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:40,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 22:07:40,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383198904] [2020-07-21 22:07:40,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:07:40,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:40,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:07:40,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:07:40,295 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 22:07:41,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:41,085 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 22:07:41,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:07:41,086 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1573 [2020-07-21 22:07:41,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:41,091 INFO L225 Difference]: With dead ends: 102 [2020-07-21 22:07:41,091 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 22:07:41,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3155 GetRequests, 3107 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 22:07:41,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 22:07:41,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 22:07:41,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 22:07:41,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 22:07:41,108 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1573 [2020-07-21 22:07:41,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:41,110 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 22:07:41,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:07:41,110 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 22:07:41,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-21 22:07:41,143 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:41,144 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:41,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:41,358 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:41,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:41,359 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-21 22:07:41,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:41,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970678077] [2020-07-21 22:07:41,360 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:07:41,778 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:41,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:41,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 1021 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 22:07:41,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:43,295 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-21 22:07:43,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:07:48,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:51,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:51,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:53,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:53,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:53,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:54,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:54,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:54,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:54,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:54,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:07:55,773 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-21 22:07:55,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970678077] [2020-07-21 22:07:55,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:07:55,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 22:07:55,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37263613] [2020-07-21 22:07:55,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:07:55,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:07:55,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:07:55,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:07:55,777 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 22:07:56,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:07:56,301 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 22:07:56,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:07:56,302 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-21 22:07:56,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:07:56,307 INFO L225 Difference]: With dead ends: 107 [2020-07-21 22:07:56,307 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 22:07:56,308 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 22:07:56,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 22:07:56,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 22:07:56,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 22:07:56,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 22:07:56,325 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-21 22:07:56,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:07:56,327 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 22:07:56,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:07:56,327 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 22:07:56,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2107 [2020-07-21 22:07:56,360 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:07:56,361 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 162, 161, 161, 161, 161, 161, 161, 161, 161, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:07:56,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:07:56,562 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:07:56,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:07:56,564 INFO L82 PathProgramCache]: Analyzing trace with hash 211951896, now seen corresponding path program 9 times [2020-07-21 22:07:56,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:07:56,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278763494] [2020-07-21 22:07:56,565 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:07:57,039 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:07:57,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:07:57,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 22:07:57,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:07:59,424 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14276 refuted. 0 times theorem prover too weak. 255984 trivial. 0 not checked. [2020-07-21 22:07:59,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:06,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:10,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:12,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:13,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:13,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:13,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:13,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:14,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:14,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:14,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:14,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:14,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:16,272 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14393 refuted. 0 times theorem prover too weak. 255867 trivial. 0 not checked. [2020-07-21 22:08:16,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278763494] [2020-07-21 22:08:16,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:16,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 22:08:16,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169317822] [2020-07-21 22:08:16,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 22:08:16,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:16,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 22:08:16,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 22:08:16,277 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 22:08:16,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:16,988 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 22:08:16,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:08:16,989 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2106 [2020-07-21 22:08:16,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:16,996 INFO L225 Difference]: With dead ends: 112 [2020-07-21 22:08:16,997 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 22:08:16,998 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4222 GetRequests, 4169 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:08:16,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 22:08:17,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 22:08:17,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 22:08:17,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 22:08:17,014 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2106 [2020-07-21 22:08:17,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:17,015 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 22:08:17,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 22:08:17,016 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 22:08:17,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2206 [2020-07-21 22:08:17,052 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:17,053 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 260, 161, 161, 161, 161, 161, 161, 161, 99, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:17,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:17,266 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:17,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:17,267 INFO L82 PathProgramCache]: Analyzing trace with hash -576304576, now seen corresponding path program 9 times [2020-07-21 22:08:17,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:17,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1228861767] [2020-07-21 22:08:17,269 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:17,806 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:17,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:17,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 1220 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 22:08:17,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:19,837 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15429 refuted. 0 times theorem prover too weak. 275642 trivial. 0 not checked. [2020-07-21 22:08:19,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:27,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:31,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:33,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:33,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:34,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:34,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:37,130 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15555 refuted. 0 times theorem prover too weak. 275516 trivial. 0 not checked. [2020-07-21 22:08:37,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1228861767] [2020-07-21 22:08:37,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:37,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 22:08:37,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115836921] [2020-07-21 22:08:37,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 22:08:37,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:37,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 22:08:37,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 22:08:37,134 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 22:08:37,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:37,913 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 22:08:37,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:08:37,914 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2205 [2020-07-21 22:08:37,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:37,920 INFO L225 Difference]: With dead ends: 117 [2020-07-21 22:08:37,921 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 22:08:37,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4419 GetRequests, 4366 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:08:37,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 22:08:37,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 22:08:37,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 22:08:37,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 22:08:37,940 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2205 [2020-07-21 22:08:37,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:37,941 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 22:08:37,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 22:08:37,942 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 22:08:38,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4434 [2020-07-21 22:08:38,105 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:38,107 INFO L422 BasicCegarLoop]: trace histogram [681, 681, 341, 340, 340, 340, 340, 340, 340, 340, 340, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:38,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:38,321 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:38,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:38,322 INFO L82 PathProgramCache]: Analyzing trace with hash 1507680547, now seen corresponding path program 10 times [2020-07-21 22:08:38,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:38,323 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595557275] [2020-07-21 22:08:38,323 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:39,268 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:39,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:39,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 2470 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 22:08:39,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:46,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1214310 backedges. 4455 proven. 34400 refuted. 0 times theorem prover too weak. 1175455 trivial. 0 not checked. [2020-07-21 22:08:46,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:09:03,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:03,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:11,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:14,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:16,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:18,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:18,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:18,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:19,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:19,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:19,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:19,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:27,069 INFO L134 CoverageAnalysis]: Checked inductivity of 1214310 backedges. 4455 proven. 34545 refuted. 0 times theorem prover too weak. 1175310 trivial. 0 not checked. [2020-07-21 22:09:27,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1595557275] [2020-07-21 22:09:27,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:09:27,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 22:09:27,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603840595] [2020-07-21 22:09:27,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 22:09:27,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:09:27,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 22:09:27,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 22:09:27,075 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 22:09:28,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:09:28,237 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 22:09:28,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 22:09:28,239 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4433 [2020-07-21 22:09:28,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:09:28,248 INFO L225 Difference]: With dead ends: 122 [2020-07-21 22:09:28,248 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 22:09:28,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8877 GetRequests, 8819 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 22:09:28,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 22:09:28,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 22:09:28,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 22:09:28,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 22:09:28,269 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4433 [2020-07-21 22:09:28,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:09:28,272 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 22:09:28,272 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 22:09:28,272 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 22:09:28,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7025 [2020-07-21 22:09:28,556 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:09:28,558 INFO L422 BasicCegarLoop]: trace histogram [1033, 1033, 819, 516, 516, 516, 516, 516, 516, 516, 303, 214, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:09:28,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:09:28,760 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:09:28,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:09:28,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1280866185, now seen corresponding path program 10 times [2020-07-21 22:09:28,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:09:28,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [537617735] [2020-07-21 22:09:28,763 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:09:30,022 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:09:30,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:09:30,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 3897 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 22:09:30,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:09:46,812 INFO L134 CoverageAnalysis]: Checked inductivity of 2998563 backedges. 6917 proven. 56182 refuted. 0 times theorem prover too weak. 2935464 trivial. 0 not checked. [2020-07-21 22:09:46,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:10:13,756 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 22:10:13,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:27,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:27,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:32,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:32,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:35,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:35,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:37,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:37,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:38,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:38,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:39,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:39,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:39,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:39,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:39,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:40,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:57,295 INFO L134 CoverageAnalysis]: Checked inductivity of 2998563 backedges. 6917 proven. 56337 refuted. 0 times theorem prover too weak. 2935309 trivial. 0 not checked. [2020-07-21 22:10:57,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [537617735] [2020-07-21 22:10:57,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:10:57,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 22:10:57,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040609842] [2020-07-21 22:10:57,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 22:10:57,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:10:57,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 22:10:57,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 22:10:57,303 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 22:10:58,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:10:58,410 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 22:10:58,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 22:10:58,415 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 7024 [2020-07-21 22:10:58,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:10:58,423 INFO L225 Difference]: With dead ends: 127 [2020-07-21 22:10:58,423 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 22:10:58,425 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14058 GetRequests, 14000 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 22:10:58,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 22:10:58,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 22:10:58,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 22:10:58,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 22:10:58,447 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 7024 [2020-07-21 22:10:58,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:10:58,451 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 22:10:58,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 22:10:58,451 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 22:10:58,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6306 [2020-07-21 22:10:58,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:10:58,698 INFO L422 BasicCegarLoop]: trace histogram [969, 969, 485, 484, 484, 484, 484, 484, 484, 484, 484, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:10:58,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:10:58,899 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:10:58,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:10:58,902 INFO L82 PathProgramCache]: Analyzing trace with hash -428638537, now seen corresponding path program 11 times [2020-07-21 22:10:58,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:10:58,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270769439] [2020-07-21 22:10:58,903 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:11:00,166 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:11:00,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:11:00,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 3512 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 22:11:00,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:11:13,937 INFO L134 CoverageAnalysis]: Checked inductivity of 2460414 backedges. 6256 proven. 54508 refuted. 0 times theorem prover too weak. 2399650 trivial. 0 not checked. [2020-07-21 22:11:13,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:11:45,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:53,900 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 22:11:53,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:01,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:01,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:04,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:04,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:07,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:08,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:08,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:09,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:09,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:09,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:09,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:09,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:10,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:10,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:24,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2460414 backedges. 6256 proven. 54684 refuted. 0 times theorem prover too weak. 2399474 trivial. 0 not checked. [2020-07-21 22:12:24,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270769439] [2020-07-21 22:12:24,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:12:24,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 22:12:24,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797384521] [2020-07-21 22:12:24,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 22:12:24,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:12:24,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 22:12:24,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:12:24,612 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 22:12:26,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:12:26,070 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 22:12:26,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:12:26,072 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 6305 [2020-07-21 22:12:26,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:12:26,081 INFO L225 Difference]: With dead ends: 132 [2020-07-21 22:12:26,081 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 22:12:26,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12622 GetRequests, 12559 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 22:12:26,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 22:12:26,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 22:12:26,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 22:12:26,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 22:12:26,106 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 6305 [2020-07-21 22:12:26,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:12:26,110 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 22:12:26,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 22:12:26,110 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 22:12:27,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11331 [2020-07-21 22:12:27,775 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:12:27,780 INFO L422 BasicCegarLoop]: trace histogram [1649, 1649, 1429, 824, 824, 824, 824, 824, 824, 824, 605, 220, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:12:27,995 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:12:27,996 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:12:27,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:12:28,000 INFO L82 PathProgramCache]: Analyzing trace with hash -544692599, now seen corresponding path program 11 times [2020-07-21 22:12:28,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:12:28,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401635629] [2020-07-21 22:12:28,001 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:12:29,987 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:12:29,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:12:30,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 6281 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 22:12:30,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:13:15,751 INFO L134 CoverageAnalysis]: Checked inductivity of 7811714 backedges. 10546 proven. 101459 refuted. 0 times theorem prover too weak. 7699709 trivial. 0 not checked. [2020-07-21 22:13:15,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:14:13,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:13,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:14,985 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 22:14:39,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:51,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:51,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:56,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:56,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:00,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:00,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:02,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:02,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:03,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:04,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:05,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:05,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:05,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:05,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:05,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:54,328 INFO L134 CoverageAnalysis]: Checked inductivity of 7811714 backedges. 10546 proven. 101646 refuted. 0 times theorem prover too weak. 7699522 trivial. 0 not checked. [2020-07-21 22:15:54,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401635629] [2020-07-21 22:15:54,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:15:54,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 22:15:54,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116500952] [2020-07-21 22:15:54,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 22:15:54,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:15:54,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 22:15:54,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:15:54,340 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 22:15:56,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:15:56,006 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 22:15:56,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:15:56,008 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 11330 [2020-07-21 22:15:56,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:15:56,022 INFO L225 Difference]: With dead ends: 137 [2020-07-21 22:15:56,023 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 22:15:56,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22671 GetRequests, 22608 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 22:15:56,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 22:15:56,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 22:15:56,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 22:15:56,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 22:15:56,054 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 11330 [2020-07-21 22:15:56,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:15:56,059 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 22:15:56,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 22:15:56,059 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 22:15:58,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17551 [2020-07-21 22:15:58,574 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:15:58,579 INFO L422 BasicCegarLoop]: trace histogram [2699, 2699, 1350, 1349, 1349, 1349, 1349, 1349, 1349, 1349, 1349, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:15:58,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:15:58,781 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:15:58,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:15:58,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1047465342, now seen corresponding path program 12 times [2020-07-21 22:15:58,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:15:58,786 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1882310420] [2020-07-21 22:15:58,786 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:16:02,733 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:16:02,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:16:02,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 9786 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 22:16:02,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:17:43,432 INFO L134 CoverageAnalysis]: Checked inductivity of 19109934 backedges. 17943 proven. 167385 refuted. 0 times theorem prover too weak. 18924606 trivial. 0 not checked. [2020-07-21 22:17:43,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:18:56,481 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 22:19:58,792 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 22:20:03,667 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 22:20:04,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts