/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 15:59:35,249 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 15:59:35,252 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 15:59:35,270 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 15:59:35,270 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 15:59:35,272 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 15:59:35,274 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 15:59:35,285 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 15:59:35,288 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 15:59:35,289 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 15:59:35,290 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 15:59:35,291 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 15:59:35,291 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 15:59:35,295 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 15:59:35,296 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 15:59:35,297 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 15:59:35,297 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 15:59:35,298 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 15:59:35,301 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 15:59:35,307 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 15:59:35,310 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 15:59:35,311 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 15:59:35,312 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 15:59:35,313 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 15:59:35,320 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 15:59:35,329 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 15:59:35,330 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 15:59:35,331 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 15:59:35,332 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 15:59:35,353 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 15:59:35,354 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 15:59:35,356 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 15:59:35,356 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 15:59:35,356 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 15:59:35,357 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 15:59:35,357 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 15:59:35,357 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 15:59:35,357 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 15:59:35,357 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 15:59:35,358 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 15:59:35,359 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 15:59:35,359 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 15:59:35,359 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 15:59:35,360 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 15:59:35,360 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 15:59:35,360 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 15:59:35,360 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 15:59:35,361 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 15:59:35,361 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 15:59:35,361 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 15:59:35,361 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:59:35,361 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 15:59:35,362 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 15:59:35,362 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 15:59:35,362 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 15:59:35,362 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:35,362 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 15:59:35,363 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 15:59:35,363 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 15:59:35,664 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 15:59:35,677 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 15:59:35,680 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 15:59:35,681 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 15:59:35,682 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 15:59:35,682 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_25-2.c [2020-07-21 15:59:35,742 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/517d7be0c/680328927b2245699f6b5a74021d1298/FLAG5a7ba9c82 [2020-07-21 15:59:36,141 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 15:59:36,141 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_25-2.c [2020-07-21 15:59:36,148 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/517d7be0c/680328927b2245699f6b5a74021d1298/FLAG5a7ba9c82 [2020-07-21 15:59:36,582 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/517d7be0c/680328927b2245699f6b5a74021d1298 [2020-07-21 15:59:36,592 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 15:59:36,596 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 15:59:36,597 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 15:59:36,597 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 15:59:36,601 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 15:59:36,602 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:59:36" (1/1) ... [2020-07-21 15:59:36,605 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b27e48e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:36, skipping insertion in model container [2020-07-21 15:59:36,605 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:59:36" (1/1) ... [2020-07-21 15:59:36,614 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 15:59:36,636 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 15:59:36,831 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:59:36,835 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 15:59:36,852 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:59:36,866 INFO L208 MainTranslator]: Completed translation [2020-07-21 15:59:36,867 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:36 WrapperNode [2020-07-21 15:59:36,867 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 15:59:36,868 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 15:59:36,868 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 15:59:36,868 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 15:59:36,878 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:36" (1/1) ... [2020-07-21 15:59:36,878 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:36" (1/1) ... [2020-07-21 15:59:36,955 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:36" (1/1) ... [2020-07-21 15:59:36,956 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:36" (1/1) ... [2020-07-21 15:59:36,965 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:36" (1/1) ... [2020-07-21 15:59:36,967 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:36" (1/1) ... [2020-07-21 15:59:36,967 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:36" (1/1) ... [2020-07-21 15:59:36,969 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 15:59:36,969 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 15:59:36,969 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 15:59:36,970 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 15:59:36,970 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:36" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:59:37,031 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 15:59:37,031 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 15:59:37,031 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 15:59:37,032 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 15:59:37,032 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 15:59:37,032 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 15:59:37,032 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 15:59:37,032 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 15:59:37,033 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 15:59:37,033 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 15:59:37,033 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 15:59:37,033 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 15:59:37,215 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 15:59:37,215 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 15:59:37,219 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:59:37 BoogieIcfgContainer [2020-07-21 15:59:37,219 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 15:59:37,221 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 15:59:37,221 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 15:59:37,224 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 15:59:37,224 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 03:59:36" (1/3) ... [2020-07-21 15:59:37,225 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36aa6437 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:59:37, skipping insertion in model container [2020-07-21 15:59:37,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:36" (2/3) ... [2020-07-21 15:59:37,226 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36aa6437 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:59:37, skipping insertion in model container [2020-07-21 15:59:37,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:59:37" (3/3) ... [2020-07-21 15:59:37,228 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_25-2.c [2020-07-21 15:59:37,239 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 15:59:37,248 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 15:59:37,287 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 15:59:37,327 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 15:59:37,327 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 15:59:37,328 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 15:59:37,328 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 15:59:37,328 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 15:59:37,328 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 15:59:37,328 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 15:59:37,328 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 15:59:37,351 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 15:59:37,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 15:59:37,356 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:37,357 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:37,357 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:37,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:37,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 15:59:37,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:37,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1866322455] [2020-07-21 15:59:37,370 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:37,432 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:37,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:37,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:59:37,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:37,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:59:37,527 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:59:37,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1866322455] [2020-07-21 15:59:37,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:59:37,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:59:37,531 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148406350] [2020-07-21 15:59:37,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:59:37,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:37,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:59:37,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:59:37,552 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 15:59:37,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:37,667 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 15:59:37,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:59:37,669 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 15:59:37,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:37,685 INFO L225 Difference]: With dead ends: 44 [2020-07-21 15:59:37,685 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 15:59:37,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:59:37,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 15:59:37,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 15:59:37,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 15:59:37,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 15:59:37,773 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 15:59:37,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:37,774 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 15:59:37,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:59:37,774 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 15:59:37,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 15:59:37,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:37,777 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:37,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:37,979 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:37,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:37,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 15:59:37,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:37,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2023486868] [2020-07-21 15:59:37,980 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:38,005 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:38,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:38,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:59:38,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:38,046 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:59:38,049 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:59:38,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2023486868] [2020-07-21 15:59:38,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:59:38,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:59:38,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644399909] [2020-07-21 15:59:38,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:59:38,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:38,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:59:38,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:59:38,053 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 15:59:38,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:38,115 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 15:59:38,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:59:38,116 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 15:59:38,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:38,118 INFO L225 Difference]: With dead ends: 36 [2020-07-21 15:59:38,118 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 15:59:38,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:59:38,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 15:59:38,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 15:59:38,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 15:59:38,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 15:59:38,129 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 15:59:38,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:38,130 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 15:59:38,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:59:38,130 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 15:59:38,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 15:59:38,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:38,132 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:38,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:38,347 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:38,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:38,349 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 15:59:38,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:38,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212724881] [2020-07-21 15:59:38,350 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:38,383 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:38,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:38,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:59:38,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:38,455 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:59:38,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:38,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,720 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:59:38,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1212724881] [2020-07-21 15:59:38,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:38,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:59:38,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765367843] [2020-07-21 15:59:38,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:59:38,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:38,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:59:38,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:59:38,725 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 15:59:38,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:38,853 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 15:59:38,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:59:38,854 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 15:59:38,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:38,856 INFO L225 Difference]: With dead ends: 41 [2020-07-21 15:59:38,856 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 15:59:38,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:38,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 15:59:38,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 15:59:38,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 15:59:38,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 15:59:38,866 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 15:59:38,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:38,867 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 15:59:38,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:59:38,867 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 15:59:38,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 15:59:38,869 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:38,869 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:39,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:39,079 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:39,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:39,080 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 15:59:39,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:39,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1161350350] [2020-07-21 15:59:39,082 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:39,110 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:39,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:39,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:59:39,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:39,161 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:59:39,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:39,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:39,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:39,353 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:59:39,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1161350350] [2020-07-21 15:59:39,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:39,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:59:39,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603027671] [2020-07-21 15:59:39,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:59:39,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:39,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:59:39,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:59:39,357 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 15:59:39,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:39,485 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 15:59:39,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:59:39,486 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 15:59:39,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:39,490 INFO L225 Difference]: With dead ends: 46 [2020-07-21 15:59:39,490 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 15:59:39,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:39,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 15:59:39,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 15:59:39,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 15:59:39,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 15:59:39,509 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 15:59:39,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:39,513 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 15:59:39,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:59:39,513 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 15:59:39,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 15:59:39,515 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:39,515 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:39,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:39,717 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:39,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:39,718 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 15:59:39,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:39,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [407444884] [2020-07-21 15:59:39,719 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:39,754 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:39,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:39,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:39,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:39,817 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 15:59:39,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:40,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,203 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:59:40,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [407444884] [2020-07-21 15:59:40,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:40,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:59:40,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050285230] [2020-07-21 15:59:40,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:40,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:40,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:40,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:40,206 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 15:59:40,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:40,381 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 15:59:40,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:40,381 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 15:59:40,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:40,386 INFO L225 Difference]: With dead ends: 51 [2020-07-21 15:59:40,386 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 15:59:40,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:59:40,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 15:59:40,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 15:59:40,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 15:59:40,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 15:59:40,398 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 15:59:40,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:40,398 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 15:59:40,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:40,399 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 15:59:40,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 15:59:40,401 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:40,401 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:40,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:40,608 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:40,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:40,609 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 15:59:40,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:40,612 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659417903] [2020-07-21 15:59:40,612 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:40,638 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:40,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:40,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:40,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:40,693 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 15:59:40,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:40,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,996 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 15:59:40,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659417903] [2020-07-21 15:59:40,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:40,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 15:59:40,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373816120] [2020-07-21 15:59:40,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:40,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:40,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:40,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:40,998 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 15:59:41,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:41,244 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-21 15:59:41,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:41,244 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 15:59:41,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:41,246 INFO L225 Difference]: With dead ends: 84 [2020-07-21 15:59:41,246 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 15:59:41,248 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:59:41,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 15:59:41,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-21 15:59:41,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 15:59:41,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-21 15:59:41,260 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-21 15:59:41,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:41,260 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-21 15:59:41,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:41,261 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-21 15:59:41,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 15:59:41,263 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:41,264 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:41,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:41,478 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:41,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:41,478 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-21 15:59:41,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:41,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [21047228] [2020-07-21 15:59:41,479 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:41,518 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:41,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:41,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:41,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:41,565 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 15:59:41,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:41,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:41,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:41,863 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:59:41,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [21047228] [2020-07-21 15:59:41,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:41,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:59:41,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067515406] [2020-07-21 15:59:41,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:41,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:41,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:41,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:41,865 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-21 15:59:42,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:42,019 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 15:59:42,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:42,019 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-21 15:59:42,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:42,021 INFO L225 Difference]: With dead ends: 63 [2020-07-21 15:59:42,021 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 15:59:42,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:59:42,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 15:59:42,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-21 15:59:42,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 15:59:42,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-21 15:59:42,043 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-21 15:59:42,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:42,045 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-21 15:59:42,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:42,045 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-21 15:59:42,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 15:59:42,054 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:42,054 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:42,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:42,255 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:42,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:42,256 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-21 15:59:42,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:42,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1150691795] [2020-07-21 15:59:42,257 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:42,294 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:42,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:42,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:59:42,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:42,350 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 15:59:42,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:42,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:42,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:42,551 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 15:59:42,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1150691795] [2020-07-21 15:59:42,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:42,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:59:42,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121209463] [2020-07-21 15:59:42,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:59:42,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:42,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:59:42,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:59:42,554 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-21 15:59:42,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:42,655 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-21 15:59:42,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:59:42,656 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-21 15:59:42,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:42,658 INFO L225 Difference]: With dead ends: 65 [2020-07-21 15:59:42,658 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 15:59:42,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:42,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 15:59:42,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-21 15:59:42,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 15:59:42,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-21 15:59:42,671 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-21 15:59:42,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:42,671 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-21 15:59:42,671 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:59:42,672 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-21 15:59:42,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 15:59:42,674 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:42,674 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:42,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:42,882 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:42,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:42,883 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-21 15:59:42,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:42,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2038201686] [2020-07-21 15:59:42,885 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:42,932 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:42,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:42,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:59:42,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:42,999 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 15:59:43,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:43,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:43,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:43,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:43,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:43,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:43,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:43,578 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 15:59:43,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2038201686] [2020-07-21 15:59:43,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:43,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:59:43,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52434738] [2020-07-21 15:59:43,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:59:43,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:43,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:59:43,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:59:43,581 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-21 15:59:43,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:43,771 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-21 15:59:43,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:59:43,771 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-21 15:59:43,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:43,774 INFO L225 Difference]: With dead ends: 75 [2020-07-21 15:59:43,774 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 15:59:43,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:59:43,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 15:59:43,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-21 15:59:43,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 15:59:43,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-21 15:59:43,794 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-21 15:59:43,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:43,794 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-21 15:59:43,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:59:43,795 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-21 15:59:43,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 15:59:43,796 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:43,796 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:44,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:44,012 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:44,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:44,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-21 15:59:44,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:44,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2051535744] [2020-07-21 15:59:44,013 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:44,054 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:44,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:44,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:44,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:44,126 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 15:59:44,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:44,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:44,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:44,486 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 15:59:44,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2051535744] [2020-07-21 15:59:44,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:44,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 15:59:44,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591373418] [2020-07-21 15:59:44,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:44,488 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:44,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:44,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:44,489 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-21 15:59:44,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:44,692 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-21 15:59:44,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:44,692 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-21 15:59:44,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:44,694 INFO L225 Difference]: With dead ends: 114 [2020-07-21 15:59:44,694 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 15:59:44,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:59:44,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 15:59:44,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 15:59:44,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 15:59:44,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-21 15:59:44,722 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-21 15:59:44,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:44,722 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-21 15:59:44,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:44,723 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-21 15:59:44,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 15:59:44,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:44,726 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:44,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:44,942 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:44,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:44,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-21 15:59:44,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:44,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1077136877] [2020-07-21 15:59:44,944 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:44,999 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:44,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:45,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:45,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:45,110 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 15:59:45,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:45,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:45,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:45,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:45,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:45,698 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 15:59:45,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1077136877] [2020-07-21 15:59:45,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:45,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 15:59:45,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944240178] [2020-07-21 15:59:45,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 15:59:45,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:45,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 15:59:45,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:59:45,701 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-21 15:59:46,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:46,110 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-21 15:59:46,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 15:59:46,111 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-21 15:59:46,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:46,117 INFO L225 Difference]: With dead ends: 131 [2020-07-21 15:59:46,117 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 15:59:46,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 15:59:46,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 15:59:46,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-21 15:59:46,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-21 15:59:46,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-21 15:59:46,130 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-21 15:59:46,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:46,130 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-21 15:59:46,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 15:59:46,131 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-21 15:59:46,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 15:59:46,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:46,133 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:46,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:46,347 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:46,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:46,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-21 15:59:46,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:46,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1347566538] [2020-07-21 15:59:46,349 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:46,403 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:46,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:46,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:59:46,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:46,514 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 15:59:46,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:46,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:46,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:46,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:46,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:47,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:47,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:47,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:47,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:47,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:47,317 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 15:59:47,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1347566538] [2020-07-21 15:59:47,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:47,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 15:59:47,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749354503] [2020-07-21 15:59:47,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:59:47,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:47,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:59:47,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:59:47,320 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-21 15:59:48,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:48,104 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-21 15:59:48,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 15:59:48,105 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-21 15:59:48,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:48,108 INFO L225 Difference]: With dead ends: 186 [2020-07-21 15:59:48,108 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 15:59:48,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 15:59:48,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 15:59:48,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-21 15:59:48,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 15:59:48,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-21 15:59:48,128 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-21 15:59:48,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:48,129 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-21 15:59:48,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 15:59:48,129 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-21 15:59:48,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 15:59:48,130 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:48,131 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:48,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:48,346 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:48,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:48,346 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-21 15:59:48,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:48,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424696252] [2020-07-21 15:59:48,347 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:48,398 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:48,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:48,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:59:48,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:48,444 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-21 15:59:48,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:48,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:48,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:48,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:48,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:48,962 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 15:59:48,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424696252] [2020-07-21 15:59:48,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:48,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:59:48,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450757362] [2020-07-21 15:59:48,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:59:48,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:48,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:59:48,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:59:48,964 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-21 15:59:49,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:49,145 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-21 15:59:49,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:59:49,147 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-21 15:59:49,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:49,148 INFO L225 Difference]: With dead ends: 114 [2020-07-21 15:59:49,148 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 15:59:49,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:59:49,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 15:59:49,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-21 15:59:49,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-21 15:59:49,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-21 15:59:49,160 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-21 15:59:49,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:49,161 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-21 15:59:49,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:59:49,161 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-21 15:59:49,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-21 15:59:49,163 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:49,163 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:49,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:49,377 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:49,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:49,378 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-21 15:59:49,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:49,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [418794971] [2020-07-21 15:59:49,379 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:49,443 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:49,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:49,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:49,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:49,546 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-21 15:59:49,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:49,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:50,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:50,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:50,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:50,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:50,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:50,278 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-21 15:59:50,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [418794971] [2020-07-21 15:59:50,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:50,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-21 15:59:50,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630430902] [2020-07-21 15:59:50,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 15:59:50,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:50,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 15:59:50,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-21 15:59:50,284 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-21 15:59:50,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:50,748 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-21 15:59:50,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 15:59:50,753 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-21 15:59:50,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:50,756 INFO L225 Difference]: With dead ends: 269 [2020-07-21 15:59:50,756 INFO L226 Difference]: Without dead ends: 168 [2020-07-21 15:59:50,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-21 15:59:50,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-21 15:59:50,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-21 15:59:50,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 15:59:50,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-21 15:59:50,780 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-21 15:59:50,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:50,781 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-21 15:59:50,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 15:59:50,782 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-21 15:59:50,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-21 15:59:50,784 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:50,784 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:50,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:50,998 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:50,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:50,998 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-21 15:59:50,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:50,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1272571296] [2020-07-21 15:59:50,999 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:51,085 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:51,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:51,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:51,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:51,140 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-21 15:59:51,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:51,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,496 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-21 15:59:51,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1272571296] [2020-07-21 15:59:51,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:51,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:59:51,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397217245] [2020-07-21 15:59:51,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:51,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:51,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:51,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:51,498 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-21 15:59:51,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:51,655 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-21 15:59:51,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:51,658 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-21 15:59:51,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:51,661 INFO L225 Difference]: With dead ends: 167 [2020-07-21 15:59:51,661 INFO L226 Difference]: Without dead ends: 163 [2020-07-21 15:59:51,662 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:59:51,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-21 15:59:51,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-21 15:59:51,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-21 15:59:51,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-21 15:59:51,689 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-21 15:59:51,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:51,689 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-21 15:59:51,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:51,690 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-21 15:59:51,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 15:59:51,692 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:51,693 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:51,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:51,907 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:51,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:51,908 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-21 15:59:51,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:51,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [788484306] [2020-07-21 15:59:51,909 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:51,980 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:51,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:51,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:59:51,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:52,073 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-21 15:59:52,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:52,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:52,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:52,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:53,198 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-21 15:59:53,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [788484306] [2020-07-21 15:59:53,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:53,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 15:59:53,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124804137] [2020-07-21 15:59:53,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:59:53,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:53,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:59:53,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:59:53,207 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-21 15:59:53,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:53,737 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-21 15:59:53,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 15:59:53,738 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-21 15:59:53,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:53,742 INFO L225 Difference]: With dead ends: 369 [2020-07-21 15:59:53,743 INFO L226 Difference]: Without dead ends: 218 [2020-07-21 15:59:53,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 15:59:53,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-21 15:59:53,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-21 15:59:53,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-21 15:59:53,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-21 15:59:53,767 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-21 15:59:53,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:53,767 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-21 15:59:53,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 15:59:53,767 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-21 15:59:53,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-21 15:59:53,770 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:53,770 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:53,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:53,984 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:53,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:53,984 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-21 15:59:53,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:53,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2037303513] [2020-07-21 15:59:53,985 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:54,058 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:54,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:54,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:54,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:54,109 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-21 15:59:54,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:54,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:54,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:54,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:54,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:54,472 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 15:59:54,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2037303513] [2020-07-21 15:59:54,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:54,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:59:54,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375209589] [2020-07-21 15:59:54,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:54,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:54,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:54,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:54,475 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-21 15:59:54,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:54,641 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-21 15:59:54,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:54,642 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-21 15:59:54,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:54,644 INFO L225 Difference]: With dead ends: 191 [2020-07-21 15:59:54,644 INFO L226 Difference]: Without dead ends: 187 [2020-07-21 15:59:54,646 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:59:54,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-21 15:59:54,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-21 15:59:54,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 15:59:54,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-21 15:59:54,661 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-21 15:59:54,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:54,661 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-21 15:59:54,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:54,661 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-21 15:59:54,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 15:59:54,664 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:54,664 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:54,877 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:54,878 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:54,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:54,878 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-21 15:59:54,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:54,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1215319712] [2020-07-21 15:59:54,879 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:54,976 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:54,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:54,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:54,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:55,047 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-21 15:59:55,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:55,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:55,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:55,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:55,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:55,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:55,930 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-21 15:59:55,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1215319712] [2020-07-21 15:59:55,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:55,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:59:55,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103209921] [2020-07-21 15:59:55,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:59:55,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:55,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:59:55,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:59:55,932 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 16 states. [2020-07-21 15:59:56,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:56,146 INFO L93 Difference]: Finished difference Result 206 states and 384 transitions. [2020-07-21 15:59:56,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:59:56,147 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 117 [2020-07-21 15:59:56,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:56,150 INFO L225 Difference]: With dead ends: 206 [2020-07-21 15:59:56,151 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 15:59:56,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:59:56,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 15:59:56,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 186. [2020-07-21 15:59:56,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2020-07-21 15:59:56,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 342 transitions. [2020-07-21 15:59:56,167 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 342 transitions. Word has length 117 [2020-07-21 15:59:56,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:56,168 INFO L479 AbstractCegarLoop]: Abstraction has 186 states and 342 transitions. [2020-07-21 15:59:56,168 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:59:56,168 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 342 transitions. [2020-07-21 15:59:56,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 15:59:56,171 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:56,171 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:56,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:56,386 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:56,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:56,387 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-21 15:59:56,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:56,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1303347355] [2020-07-21 15:59:56,388 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:56,464 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:56,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:56,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:56,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:56,545 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 15:59:56,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:57,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:57,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:57,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:57,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:57,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:57,391 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-21 15:59:57,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1303347355] [2020-07-21 15:59:57,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:57,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 15:59:57,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064448749] [2020-07-21 15:59:57,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 15:59:57,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:57,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 15:59:57,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:59:57,393 INFO L87 Difference]: Start difference. First operand 186 states and 342 transitions. Second operand 17 states. [2020-07-21 15:59:57,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:57,726 INFO L93 Difference]: Finished difference Result 376 states and 717 transitions. [2020-07-21 15:59:57,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 15:59:57,727 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-21 15:59:57,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:57,729 INFO L225 Difference]: With dead ends: 376 [2020-07-21 15:59:57,730 INFO L226 Difference]: Without dead ends: 192 [2020-07-21 15:59:57,732 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 15:59:57,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-21 15:59:57,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-21 15:59:57,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 15:59:57,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 336 transitions. [2020-07-21 15:59:57,746 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 336 transitions. Word has length 120 [2020-07-21 15:59:57,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:57,746 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 336 transitions. [2020-07-21 15:59:57,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 15:59:57,746 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 336 transitions. [2020-07-21 15:59:57,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-21 15:59:57,750 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:57,750 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 9, 9, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:57,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:57,964 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:57,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:57,964 INFO L82 PathProgramCache]: Analyzing trace with hash 1301266126, now seen corresponding path program 6 times [2020-07-21 15:59:57,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:57,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1915575611] [2020-07-21 15:59:57,965 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:58,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:58,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:58,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:59:58,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:58,251 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 145 proven. 298 refuted. 0 times theorem prover too weak. 457 trivial. 0 not checked. [2020-07-21 15:59:58,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:59,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:00,036 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 147 proven. 306 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2020-07-21 16:00:00,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1915575611] [2020-07-21 16:00:00,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:00,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-21 16:00:00,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097723850] [2020-07-21 16:00:00,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:00:00,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:00,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:00:00,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:00:00,039 INFO L87 Difference]: Start difference. First operand 190 states and 336 transitions. Second operand 25 states. [2020-07-21 16:00:01,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:01,011 INFO L93 Difference]: Finished difference Result 479 states and 998 transitions. [2020-07-21 16:00:01,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 16:00:01,015 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 187 [2020-07-21 16:00:01,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:01,019 INFO L225 Difference]: With dead ends: 479 [2020-07-21 16:00:01,020 INFO L226 Difference]: Without dead ends: 294 [2020-07-21 16:00:01,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 335 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=306, Invalid=1500, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 16:00:01,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-21 16:00:01,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 239. [2020-07-21 16:00:01,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-07-21 16:00:01,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 445 transitions. [2020-07-21 16:00:01,043 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 445 transitions. Word has length 187 [2020-07-21 16:00:01,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:01,044 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 445 transitions. [2020-07-21 16:00:01,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:00:01,044 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 445 transitions. [2020-07-21 16:00:01,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2020-07-21 16:00:01,048 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:01,048 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 7, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:01,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:01,261 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:01,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:01,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1318349734, now seen corresponding path program 7 times [2020-07-21 16:00:01,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:01,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [128572773] [2020-07-21 16:00:01,262 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:01,360 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:01,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:01,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:00:01,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:01,477 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 90 proven. 154 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2020-07-21 16:00:01,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:02,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,775 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 90 proven. 161 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2020-07-21 16:00:02,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [128572773] [2020-07-21 16:00:02,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:02,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:00:02,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648302629] [2020-07-21 16:00:02,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:02,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:02,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:02,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:02,777 INFO L87 Difference]: Start difference. First operand 239 states and 445 transitions. Second operand 21 states. [2020-07-21 16:00:03,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:03,487 INFO L93 Difference]: Finished difference Result 506 states and 1002 transitions. [2020-07-21 16:00:03,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:00:03,488 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 134 [2020-07-21 16:00:03,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:03,491 INFO L225 Difference]: With dead ends: 506 [2020-07-21 16:00:03,491 INFO L226 Difference]: Without dead ends: 268 [2020-07-21 16:00:03,494 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 234 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=241, Invalid=1091, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:00:03,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2020-07-21 16:00:03,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 243. [2020-07-21 16:00:03,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 243 states. [2020-07-21 16:00:03,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 452 transitions. [2020-07-21 16:00:03,517 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 452 transitions. Word has length 134 [2020-07-21 16:00:03,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:03,517 INFO L479 AbstractCegarLoop]: Abstraction has 243 states and 452 transitions. [2020-07-21 16:00:03,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:03,518 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 452 transitions. [2020-07-21 16:00:03,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 16:00:03,521 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:03,522 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:03,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:03,735 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:03,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:03,735 INFO L82 PathProgramCache]: Analyzing trace with hash 538488582, now seen corresponding path program 8 times [2020-07-21 16:00:03,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:03,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1908536953] [2020-07-21 16:00:03,736 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:03,878 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:03,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:03,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:03,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:03,940 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 25 proven. 148 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2020-07-21 16:00:03,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:04,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:04,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:04,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:04,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:04,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:04,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:04,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:04,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:04,914 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 25 proven. 158 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2020-07-21 16:00:04,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1908536953] [2020-07-21 16:00:04,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:04,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:04,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329798175] [2020-07-21 16:00:04,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:04,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:04,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:04,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:04,919 INFO L87 Difference]: Start difference. First operand 243 states and 452 transitions. Second operand 16 states. [2020-07-21 16:00:05,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:05,151 INFO L93 Difference]: Finished difference Result 250 states and 462 transitions. [2020-07-21 16:00:05,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:05,153 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 133 [2020-07-21 16:00:05,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:05,156 INFO L225 Difference]: With dead ends: 250 [2020-07-21 16:00:05,156 INFO L226 Difference]: Without dead ends: 246 [2020-07-21 16:00:05,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 242 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:05,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2020-07-21 16:00:05,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 238. [2020-07-21 16:00:05,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-21 16:00:05,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 437 transitions. [2020-07-21 16:00:05,175 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 437 transitions. Word has length 133 [2020-07-21 16:00:05,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:05,175 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 437 transitions. [2020-07-21 16:00:05,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:05,175 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 437 transitions. [2020-07-21 16:00:05,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-07-21 16:00:05,179 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:05,180 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:05,393 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:05,394 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:05,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:05,394 INFO L82 PathProgramCache]: Analyzing trace with hash -60942306, now seen corresponding path program 2 times [2020-07-21 16:00:05,394 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:05,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1590093735] [2020-07-21 16:00:05,395 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:05,504 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:05,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:05,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:05,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:05,618 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 120 proven. 107 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2020-07-21 16:00:05,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:06,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,593 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 120 proven. 110 refuted. 0 times theorem prover too weak. 215 trivial. 0 not checked. [2020-07-21 16:00:06,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1590093735] [2020-07-21 16:00:06,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:06,594 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:00:06,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202171844] [2020-07-21 16:00:06,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:06,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:06,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:06,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:06,595 INFO L87 Difference]: Start difference. First operand 238 states and 437 transitions. Second operand 19 states. [2020-07-21 16:00:07,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:07,044 INFO L93 Difference]: Finished difference Result 494 states and 945 transitions. [2020-07-21 16:00:07,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:00:07,044 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 132 [2020-07-21 16:00:07,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:07,047 INFO L225 Difference]: With dead ends: 494 [2020-07-21 16:00:07,047 INFO L226 Difference]: Without dead ends: 262 [2020-07-21 16:00:07,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 234 SyntacticMatches, 13 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:00:07,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-21 16:00:07,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 244. [2020-07-21 16:00:07,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-21 16:00:07,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 434 transitions. [2020-07-21 16:00:07,069 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 434 transitions. Word has length 132 [2020-07-21 16:00:07,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:07,070 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 434 transitions. [2020-07-21 16:00:07,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:07,071 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 434 transitions. [2020-07-21 16:00:07,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 16:00:07,074 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:07,075 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:07,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:07,290 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:07,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:07,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1996526584, now seen corresponding path program 3 times [2020-07-21 16:00:07,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:07,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [789706684] [2020-07-21 16:00:07,291 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:07,416 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:07,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:07,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:07,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:07,477 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 48 proven. 105 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2020-07-21 16:00:07,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:07,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,173 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 48 proven. 110 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2020-07-21 16:00:08,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [789706684] [2020-07-21 16:00:08,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:08,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:08,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129900653] [2020-07-21 16:00:08,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:08,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:08,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:08,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:08,175 INFO L87 Difference]: Start difference. First operand 244 states and 434 transitions. Second operand 14 states. [2020-07-21 16:00:08,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:08,333 INFO L93 Difference]: Finished difference Result 282 states and 514 transitions. [2020-07-21 16:00:08,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:08,334 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 133 [2020-07-21 16:00:08,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:08,337 INFO L225 Difference]: With dead ends: 282 [2020-07-21 16:00:08,337 INFO L226 Difference]: Without dead ends: 278 [2020-07-21 16:00:08,338 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 246 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:08,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2020-07-21 16:00:08,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 257. [2020-07-21 16:00:08,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2020-07-21 16:00:08,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 461 transitions. [2020-07-21 16:00:08,357 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 461 transitions. Word has length 133 [2020-07-21 16:00:08,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:08,357 INFO L479 AbstractCegarLoop]: Abstraction has 257 states and 461 transitions. [2020-07-21 16:00:08,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:08,358 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 461 transitions. [2020-07-21 16:00:08,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 16:00:08,361 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:08,361 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:08,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:08,575 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:08,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:08,575 INFO L82 PathProgramCache]: Analyzing trace with hash -71686390, now seen corresponding path program 9 times [2020-07-21 16:00:08,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:08,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56368640] [2020-07-21 16:00:08,576 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:08,706 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:08,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:08,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:08,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:08,758 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 76 proven. 73 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-07-21 16:00:08,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:09,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:09,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:09,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:09,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:09,436 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 76 proven. 78 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2020-07-21 16:00:09,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56368640] [2020-07-21 16:00:09,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:09,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:09,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490349133] [2020-07-21 16:00:09,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:09,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:09,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:09,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:09,439 INFO L87 Difference]: Start difference. First operand 257 states and 461 transitions. Second operand 14 states. [2020-07-21 16:00:09,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:09,656 INFO L93 Difference]: Finished difference Result 287 states and 538 transitions. [2020-07-21 16:00:09,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:09,657 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 133 [2020-07-21 16:00:09,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:09,660 INFO L225 Difference]: With dead ends: 287 [2020-07-21 16:00:09,660 INFO L226 Difference]: Without dead ends: 283 [2020-07-21 16:00:09,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 245 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:09,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2020-07-21 16:00:09,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 257. [2020-07-21 16:00:09,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2020-07-21 16:00:09,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 461 transitions. [2020-07-21 16:00:09,684 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 461 transitions. Word has length 133 [2020-07-21 16:00:09,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:09,684 INFO L479 AbstractCegarLoop]: Abstraction has 257 states and 461 transitions. [2020-07-21 16:00:09,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:09,684 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 461 transitions. [2020-07-21 16:00:09,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2020-07-21 16:00:09,687 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:09,688 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:09,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:09,901 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:09,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:09,901 INFO L82 PathProgramCache]: Analyzing trace with hash -146170438, now seen corresponding path program 4 times [2020-07-21 16:00:09,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:09,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1202063833] [2020-07-21 16:00:09,903 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:10,078 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:10,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:10,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:10,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:10,146 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 139 proven. 46 refuted. 0 times theorem prover too weak. 429 trivial. 0 not checked. [2020-07-21 16:00:10,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:10,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,874 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 141 proven. 49 refuted. 0 times theorem prover too weak. 424 trivial. 0 not checked. [2020-07-21 16:00:10,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1202063833] [2020-07-21 16:00:10,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:10,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:10,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539923857] [2020-07-21 16:00:10,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:10,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:10,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:10,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:10,875 INFO L87 Difference]: Start difference. First operand 257 states and 461 transitions. Second operand 14 states. [2020-07-21 16:00:11,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:11,053 INFO L93 Difference]: Finished difference Result 267 states and 477 transitions. [2020-07-21 16:00:11,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:11,056 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 157 [2020-07-21 16:00:11,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:11,059 INFO L225 Difference]: With dead ends: 267 [2020-07-21 16:00:11,059 INFO L226 Difference]: Without dead ends: 263 [2020-07-21 16:00:11,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 295 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:11,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2020-07-21 16:00:11,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 257. [2020-07-21 16:00:11,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2020-07-21 16:00:11,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 461 transitions. [2020-07-21 16:00:11,077 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 461 transitions. Word has length 157 [2020-07-21 16:00:11,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:11,077 INFO L479 AbstractCegarLoop]: Abstraction has 257 states and 461 transitions. [2020-07-21 16:00:11,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:11,078 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 461 transitions. [2020-07-21 16:00:11,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2020-07-21 16:00:11,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:11,082 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 10, 9, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:11,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:11,296 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:11,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:11,297 INFO L82 PathProgramCache]: Analyzing trace with hash -1330975970, now seen corresponding path program 10 times [2020-07-21 16:00:11,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:11,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [406840917] [2020-07-21 16:00:11,298 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:11,444 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:11,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:11,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:11,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:11,561 INFO L134 CoverageAnalysis]: Checked inductivity of 1177 backedges. 557 proven. 32 refuted. 0 times theorem prover too weak. 588 trivial. 0 not checked. [2020-07-21 16:00:11,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:12,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:12,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:12,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:12,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1177 backedges. 104 proven. 319 refuted. 0 times theorem prover too weak. 754 trivial. 0 not checked. [2020-07-21 16:00:12,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [406840917] [2020-07-21 16:00:12,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:12,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:12,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625146709] [2020-07-21 16:00:12,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:12,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:12,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:12,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:12,848 INFO L87 Difference]: Start difference. First operand 257 states and 461 transitions. Second operand 17 states. [2020-07-21 16:00:13,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:13,269 INFO L93 Difference]: Finished difference Result 518 states and 980 transitions. [2020-07-21 16:00:13,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:00:13,270 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 212 [2020-07-21 16:00:13,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:13,275 INFO L225 Difference]: With dead ends: 518 [2020-07-21 16:00:13,275 INFO L226 Difference]: Without dead ends: 263 [2020-07-21 16:00:13,279 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 397 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:00:13,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2020-07-21 16:00:13,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 235. [2020-07-21 16:00:13,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2020-07-21 16:00:13,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 407 transitions. [2020-07-21 16:00:13,300 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 407 transitions. Word has length 212 [2020-07-21 16:00:13,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:13,301 INFO L479 AbstractCegarLoop]: Abstraction has 235 states and 407 transitions. [2020-07-21 16:00:13,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:13,301 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 407 transitions. [2020-07-21 16:00:13,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2020-07-21 16:00:13,329 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:13,329 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 14, 13, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 8, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:13,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:13,543 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:13,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:13,544 INFO L82 PathProgramCache]: Analyzing trace with hash -544690319, now seen corresponding path program 11 times [2020-07-21 16:00:13,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:13,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846785119] [2020-07-21 16:00:13,544 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:13,699 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:13,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:13,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:00:13,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:13,875 INFO L134 CoverageAnalysis]: Checked inductivity of 2129 backedges. 301 proven. 590 refuted. 0 times theorem prover too weak. 1238 trivial. 0 not checked. [2020-07-21 16:00:13,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:15,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:15,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:15,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:15,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:15,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:15,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2129 backedges. 303 proven. 608 refuted. 0 times theorem prover too weak. 1218 trivial. 0 not checked. [2020-07-21 16:00:16,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846785119] [2020-07-21 16:00:16,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:16,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 29 [2020-07-21 16:00:16,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720664035] [2020-07-21 16:00:16,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:00:16,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:16,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:00:16,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=716, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:00:16,652 INFO L87 Difference]: Start difference. First operand 235 states and 407 transitions. Second operand 29 states. [2020-07-21 16:00:17,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:17,952 INFO L93 Difference]: Finished difference Result 551 states and 1075 transitions. [2020-07-21 16:00:17,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 16:00:17,953 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 280 [2020-07-21 16:00:17,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:17,959 INFO L225 Difference]: With dead ends: 551 [2020-07-21 16:00:17,960 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 16:00:17,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 513 SyntacticMatches, 19 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=460, Invalid=2402, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 16:00:17,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 16:00:17,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 270. [2020-07-21 16:00:17,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-21 16:00:17,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 495 transitions. [2020-07-21 16:00:17,986 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 495 transitions. Word has length 280 [2020-07-21 16:00:17,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:17,986 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 495 transitions. [2020-07-21 16:00:17,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:00:17,987 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 495 transitions. [2020-07-21 16:00:17,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2020-07-21 16:00:17,990 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:17,990 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 9, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:18,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:18,204 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:18,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:18,204 INFO L82 PathProgramCache]: Analyzing trace with hash 883783223, now seen corresponding path program 5 times [2020-07-21 16:00:18,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:18,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1751803793] [2020-07-21 16:00:18,205 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:18,366 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:18,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:18,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:18,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:18,473 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 439 proven. 86 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-21 16:00:18,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:19,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,880 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 99 proven. 237 refuted. 0 times theorem prover too weak. 411 trivial. 0 not checked. [2020-07-21 16:00:19,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1751803793] [2020-07-21 16:00:19,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:19,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:00:19,881 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110320794] [2020-07-21 16:00:19,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:19,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:19,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:19,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:19,882 INFO L87 Difference]: Start difference. First operand 270 states and 495 transitions. Second operand 19 states. [2020-07-21 16:00:20,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:20,386 INFO L93 Difference]: Finished difference Result 546 states and 1029 transitions. [2020-07-21 16:00:20,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:00:20,387 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 172 [2020-07-21 16:00:20,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:20,390 INFO L225 Difference]: With dead ends: 546 [2020-07-21 16:00:20,390 INFO L226 Difference]: Without dead ends: 282 [2020-07-21 16:00:20,394 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 314 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=162, Invalid=708, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:00:20,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-21 16:00:20,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 267. [2020-07-21 16:00:20,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2020-07-21 16:00:20,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 487 transitions. [2020-07-21 16:00:20,414 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 487 transitions. Word has length 172 [2020-07-21 16:00:20,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:20,414 INFO L479 AbstractCegarLoop]: Abstraction has 267 states and 487 transitions. [2020-07-21 16:00:20,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:20,414 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 487 transitions. [2020-07-21 16:00:20,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2020-07-21 16:00:20,417 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:20,418 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:20,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:20,632 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:20,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:20,633 INFO L82 PathProgramCache]: Analyzing trace with hash 920981290, now seen corresponding path program 5 times [2020-07-21 16:00:20,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:20,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1101268850] [2020-07-21 16:00:20,634 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:20,810 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:20,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:20,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:20,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:20,898 INFO L134 CoverageAnalysis]: Checked inductivity of 622 backedges. 44 proven. 206 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2020-07-21 16:00:20,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:21,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:21,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:22,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:22,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:22,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:22,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:22,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:22,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:22,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:22,455 INFO L134 CoverageAnalysis]: Checked inductivity of 622 backedges. 44 proven. 220 refuted. 0 times theorem prover too weak. 358 trivial. 0 not checked. [2020-07-21 16:00:22,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1101268850] [2020-07-21 16:00:22,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:22,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:00:22,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791261581] [2020-07-21 16:00:22,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:00:22,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:22,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:00:22,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:22,456 INFO L87 Difference]: Start difference. First operand 267 states and 487 transitions. Second operand 18 states. [2020-07-21 16:00:22,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:22,701 INFO L93 Difference]: Finished difference Result 287 states and 529 transitions. [2020-07-21 16:00:22,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:00:22,703 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 157 [2020-07-21 16:00:22,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:22,706 INFO L225 Difference]: With dead ends: 287 [2020-07-21 16:00:22,706 INFO L226 Difference]: Without dead ends: 283 [2020-07-21 16:00:22,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 286 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:00:22,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2020-07-21 16:00:22,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 262. [2020-07-21 16:00:22,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2020-07-21 16:00:22,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 476 transitions. [2020-07-21 16:00:22,735 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 476 transitions. Word has length 157 [2020-07-21 16:00:22,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:22,735 INFO L479 AbstractCegarLoop]: Abstraction has 262 states and 476 transitions. [2020-07-21 16:00:22,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:00:22,736 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 476 transitions. [2020-07-21 16:00:22,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2020-07-21 16:00:22,739 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:22,739 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 9, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:22,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:22,955 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:22,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:22,956 INFO L82 PathProgramCache]: Analyzing trace with hash 1509705344, now seen corresponding path program 12 times [2020-07-21 16:00:22,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:22,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [609712181] [2020-07-21 16:00:22,956 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:23,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:23,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:23,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:00:23,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:23,273 INFO L134 CoverageAnalysis]: Checked inductivity of 909 backedges. 228 proven. 215 refuted. 0 times theorem prover too weak. 466 trivial. 0 not checked. [2020-07-21 16:00:23,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:24,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,965 INFO L134 CoverageAnalysis]: Checked inductivity of 909 backedges. 230 proven. 222 refuted. 0 times theorem prover too weak. 457 trivial. 0 not checked. [2020-07-21 16:00:24,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [609712181] [2020-07-21 16:00:24,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:24,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:00:24,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198185545] [2020-07-21 16:00:24,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:00:24,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:24,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:00:24,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:00:24,967 INFO L87 Difference]: Start difference. First operand 262 states and 476 transitions. Second operand 23 states. [2020-07-21 16:00:25,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:25,735 INFO L93 Difference]: Finished difference Result 573 states and 1083 transitions. [2020-07-21 16:00:25,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 16:00:25,736 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 188 [2020-07-21 16:00:25,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:25,741 INFO L225 Difference]: With dead ends: 573 [2020-07-21 16:00:25,741 INFO L226 Difference]: Without dead ends: 297 [2020-07-21 16:00:25,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 337 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=220, Invalid=1112, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:00:25,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2020-07-21 16:00:25,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 264. [2020-07-21 16:00:25,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2020-07-21 16:00:25,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 445 transitions. [2020-07-21 16:00:25,773 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 445 transitions. Word has length 188 [2020-07-21 16:00:25,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:25,774 INFO L479 AbstractCegarLoop]: Abstraction has 264 states and 445 transitions. [2020-07-21 16:00:25,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:00:25,774 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 445 transitions. [2020-07-21 16:00:25,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 16:00:25,779 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:25,779 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:25,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:25,995 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:25,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:25,995 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 13 times [2020-07-21 16:00:25,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:25,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1232744822] [2020-07-21 16:00:25,996 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:26,210 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:26,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:26,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:26,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:26,301 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 45 proven. 260 refuted. 0 times theorem prover too weak. 481 trivial. 0 not checked. [2020-07-21 16:00:26,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:27,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,855 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 45 proven. 276 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2020-07-21 16:00:27,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1232744822] [2020-07-21 16:00:27,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:27,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:00:27,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343216185] [2020-07-21 16:00:27,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:00:27,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:27,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:00:27,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:27,857 INFO L87 Difference]: Start difference. First operand 264 states and 445 transitions. Second operand 18 states. [2020-07-21 16:00:28,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:28,101 INFO L93 Difference]: Finished difference Result 273 states and 458 transitions. [2020-07-21 16:00:28,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:00:28,102 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 177 [2020-07-21 16:00:28,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:28,105 INFO L225 Difference]: With dead ends: 273 [2020-07-21 16:00:28,105 INFO L226 Difference]: Without dead ends: 269 [2020-07-21 16:00:28,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 325 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:00:28,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2020-07-21 16:00:28,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 266. [2020-07-21 16:00:28,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 266 states. [2020-07-21 16:00:28,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 448 transitions. [2020-07-21 16:00:28,124 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 448 transitions. Word has length 177 [2020-07-21 16:00:28,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:28,124 INFO L479 AbstractCegarLoop]: Abstraction has 266 states and 448 transitions. [2020-07-21 16:00:28,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:00:28,124 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 448 transitions. [2020-07-21 16:00:28,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 16:00:28,127 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:28,127 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:28,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:28,343 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:28,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:28,343 INFO L82 PathProgramCache]: Analyzing trace with hash 1803358882, now seen corresponding path program 14 times [2020-07-21 16:00:28,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:28,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [629121335] [2020-07-21 16:00:28,343 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:28,578 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:28,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:28,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:28,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:28,648 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 79 proven. 212 refuted. 0 times theorem prover too weak. 627 trivial. 0 not checked. [2020-07-21 16:00:28,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:29,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,819 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 79 proven. 222 refuted. 0 times theorem prover too weak. 617 trivial. 0 not checked. [2020-07-21 16:00:29,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [629121335] [2020-07-21 16:00:29,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:29,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:29,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390381947] [2020-07-21 16:00:29,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:29,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:29,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:29,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:29,821 INFO L87 Difference]: Start difference. First operand 266 states and 448 transitions. Second operand 16 states. [2020-07-21 16:00:30,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:30,055 INFO L93 Difference]: Finished difference Result 311 states and 555 transitions. [2020-07-21 16:00:30,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:30,056 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 189 [2020-07-21 16:00:30,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:30,060 INFO L225 Difference]: With dead ends: 311 [2020-07-21 16:00:30,060 INFO L226 Difference]: Without dead ends: 307 [2020-07-21 16:00:30,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 353 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:30,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2020-07-21 16:00:30,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 284. [2020-07-21 16:00:30,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 16:00:30,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 496 transitions. [2020-07-21 16:00:30,080 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 496 transitions. Word has length 189 [2020-07-21 16:00:30,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:30,081 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 496 transitions. [2020-07-21 16:00:30,081 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:30,081 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 496 transitions. [2020-07-21 16:00:30,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-07-21 16:00:30,084 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:30,084 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 18, 18, 15, 13, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 6, 6, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:30,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:30,300 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:30,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:30,301 INFO L82 PathProgramCache]: Analyzing trace with hash -1402502088, now seen corresponding path program 15 times [2020-07-21 16:00:30,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:30,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568184689] [2020-07-21 16:00:30,302 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:30,528 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:30,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:30,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:00:30,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:30,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1959 backedges. 1194 proven. 121 refuted. 0 times theorem prover too weak. 644 trivial. 0 not checked. [2020-07-21 16:00:30,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:31,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1959 backedges. 268 proven. 429 refuted. 0 times theorem prover too weak. 1262 trivial. 0 not checked. [2020-07-21 16:00:32,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568184689] [2020-07-21 16:00:32,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:32,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:00:32,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088966423] [2020-07-21 16:00:32,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:32,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:32,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:32,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:32,625 INFO L87 Difference]: Start difference. First operand 284 states and 496 transitions. Second operand 21 states. [2020-07-21 16:00:33,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:33,456 INFO L93 Difference]: Finished difference Result 729 states and 1455 transitions. [2020-07-21 16:00:33,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 16:00:33,457 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 269 [2020-07-21 16:00:33,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:33,461 INFO L225 Difference]: With dead ends: 729 [2020-07-21 16:00:33,461 INFO L226 Difference]: Without dead ends: 343 [2020-07-21 16:00:33,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 503 SyntacticMatches, 15 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=223, Invalid=1037, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 16:00:33,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2020-07-21 16:00:33,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 307. [2020-07-21 16:00:33,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 307 states. [2020-07-21 16:00:33,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 545 transitions. [2020-07-21 16:00:33,489 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 545 transitions. Word has length 269 [2020-07-21 16:00:33,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:33,490 INFO L479 AbstractCegarLoop]: Abstraction has 307 states and 545 transitions. [2020-07-21 16:00:33,490 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:33,490 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 545 transitions. [2020-07-21 16:00:33,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 318 [2020-07-21 16:00:33,494 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:33,494 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 21, 21, 15, 13, 13, 13, 13, 13, 13, 13, 13, 13, 10, 10, 10, 10, 10, 10, 10, 6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:33,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:33,708 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:33,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:33,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1922474828, now seen corresponding path program 16 times [2020-07-21 16:00:33,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:33,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [967724289] [2020-07-21 16:00:33,709 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:33,998 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:33,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:34,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:00:34,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:34,244 INFO L134 CoverageAnalysis]: Checked inductivity of 2815 backedges. 415 proven. 548 refuted. 0 times theorem prover too weak. 1852 trivial. 0 not checked. [2020-07-21 16:00:34,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:35,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,807 INFO L134 CoverageAnalysis]: Checked inductivity of 2815 backedges. 415 proven. 563 refuted. 0 times theorem prover too weak. 1837 trivial. 0 not checked. [2020-07-21 16:00:36,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [967724289] [2020-07-21 16:00:36,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:36,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:00:36,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301297878] [2020-07-21 16:00:36,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:00:36,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:36,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:00:36,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:00:36,809 INFO L87 Difference]: Start difference. First operand 307 states and 545 transitions. Second operand 25 states. [2020-07-21 16:00:38,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:38,022 INFO L93 Difference]: Finished difference Result 799 states and 1605 transitions. [2020-07-21 16:00:38,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 16:00:38,023 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 317 [2020-07-21 16:00:38,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:38,028 INFO L225 Difference]: With dead ends: 799 [2020-07-21 16:00:38,028 INFO L226 Difference]: Without dead ends: 411 [2020-07-21 16:00:38,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 591 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=344, Invalid=1726, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 16:00:38,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2020-07-21 16:00:38,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 371. [2020-07-21 16:00:38,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 371 states. [2020-07-21 16:00:38,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 680 transitions. [2020-07-21 16:00:38,056 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 680 transitions. Word has length 317 [2020-07-21 16:00:38,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:38,056 INFO L479 AbstractCegarLoop]: Abstraction has 371 states and 680 transitions. [2020-07-21 16:00:38,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:00:38,056 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 680 transitions. [2020-07-21 16:00:38,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 16:00:38,060 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:38,060 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:38,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:38,274 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:38,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:38,275 INFO L82 PathProgramCache]: Analyzing trace with hash -1711365749, now seen corresponding path program 17 times [2020-07-21 16:00:38,275 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:38,275 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480460639] [2020-07-21 16:00:38,275 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:38,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:38,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:38,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:38,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:38,616 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 200 refuted. 0 times theorem prover too weak. 731 trivial. 0 not checked. [2020-07-21 16:00:38,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:39,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 210 refuted. 0 times theorem prover too weak. 721 trivial. 0 not checked. [2020-07-21 16:00:39,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480460639] [2020-07-21 16:00:39,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:39,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:39,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561775800] [2020-07-21 16:00:39,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:39,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:39,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:39,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:39,825 INFO L87 Difference]: Start difference. First operand 371 states and 680 transitions. Second operand 16 states. [2020-07-21 16:00:40,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:40,061 INFO L93 Difference]: Finished difference Result 381 states and 698 transitions. [2020-07-21 16:00:40,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:40,062 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 201 [2020-07-21 16:00:40,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:40,066 INFO L225 Difference]: With dead ends: 381 [2020-07-21 16:00:40,066 INFO L226 Difference]: Without dead ends: 377 [2020-07-21 16:00:40,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 377 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:40,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2020-07-21 16:00:40,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 356. [2020-07-21 16:00:40,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 356 states. [2020-07-21 16:00:40,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 356 states to 356 states and 648 transitions. [2020-07-21 16:00:40,089 INFO L78 Accepts]: Start accepts. Automaton has 356 states and 648 transitions. Word has length 201 [2020-07-21 16:00:40,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:40,089 INFO L479 AbstractCegarLoop]: Abstraction has 356 states and 648 transitions. [2020-07-21 16:00:40,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:40,089 INFO L276 IsEmpty]: Start isEmpty. Operand 356 states and 648 transitions. [2020-07-21 16:00:40,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2020-07-21 16:00:40,092 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:40,093 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 21, 21, 18, 18, 17, 17, 17, 17, 17, 17, 17, 16, 10, 10, 10, 10, 10, 10, 10, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:40,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:40,301 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:40,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:40,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1892810842, now seen corresponding path program 18 times [2020-07-21 16:00:40,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:40,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328779660] [2020-07-21 16:00:40,303 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:40,582 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:40,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:40,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:00:40,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:40,740 INFO L134 CoverageAnalysis]: Checked inductivity of 4081 backedges. 1898 proven. 124 refuted. 0 times theorem prover too weak. 2059 trivial. 0 not checked. [2020-07-21 16:00:40,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:42,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,359 INFO L134 CoverageAnalysis]: Checked inductivity of 4081 backedges. 212 proven. 864 refuted. 0 times theorem prover too weak. 3005 trivial. 0 not checked. [2020-07-21 16:00:43,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328779660] [2020-07-21 16:00:43,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:43,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:00:43,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669844185] [2020-07-21 16:00:43,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:43,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:43,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:43,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:43,361 INFO L87 Difference]: Start difference. First operand 356 states and 648 transitions. Second operand 21 states. [2020-07-21 16:00:44,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:44,010 INFO L93 Difference]: Finished difference Result 726 states and 1456 transitions. [2020-07-21 16:00:44,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:00:44,011 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 371 [2020-07-21 16:00:44,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:44,015 INFO L225 Difference]: With dead ends: 726 [2020-07-21 16:00:44,015 INFO L226 Difference]: Without dead ends: 359 [2020-07-21 16:00:44,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 755 GetRequests, 707 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:00:44,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2020-07-21 16:00:44,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 320. [2020-07-21 16:00:44,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2020-07-21 16:00:44,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 565 transitions. [2020-07-21 16:00:44,038 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 565 transitions. Word has length 371 [2020-07-21 16:00:44,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:44,039 INFO L479 AbstractCegarLoop]: Abstraction has 320 states and 565 transitions. [2020-07-21 16:00:44,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:44,039 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 565 transitions. [2020-07-21 16:00:44,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2020-07-21 16:00:44,042 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:44,042 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 12, 11, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:44,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:44,257 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:44,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:44,258 INFO L82 PathProgramCache]: Analyzing trace with hash -1753836980, now seen corresponding path program 19 times [2020-07-21 16:00:44,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:44,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970904298] [2020-07-21 16:00:44,259 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:44,553 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:44,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:44,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:00:44,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:44,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1889 backedges. 976 proven. 274 refuted. 0 times theorem prover too weak. 639 trivial. 0 not checked. [2020-07-21 16:00:44,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:46,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,308 INFO L134 CoverageAnalysis]: Checked inductivity of 1889 backedges. 221 proven. 517 refuted. 0 times theorem prover too weak. 1151 trivial. 0 not checked. [2020-07-21 16:00:47,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970904298] [2020-07-21 16:00:47,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:47,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:00:47,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639009459] [2020-07-21 16:00:47,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:00:47,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:47,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:00:47,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:00:47,314 INFO L87 Difference]: Start difference. First operand 320 states and 565 transitions. Second operand 23 states. [2020-07-21 16:00:48,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:48,135 INFO L93 Difference]: Finished difference Result 664 states and 1237 transitions. [2020-07-21 16:00:48,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 16:00:48,136 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 264 [2020-07-21 16:00:48,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:48,139 INFO L225 Difference]: With dead ends: 664 [2020-07-21 16:00:48,139 INFO L226 Difference]: Without dead ends: 341 [2020-07-21 16:00:48,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 544 GetRequests, 489 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=274, Invalid=1286, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:00:48,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2020-07-21 16:00:48,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 291. [2020-07-21 16:00:48,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291 states. [2020-07-21 16:00:48,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 473 transitions. [2020-07-21 16:00:48,161 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 473 transitions. Word has length 264 [2020-07-21 16:00:48,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:48,161 INFO L479 AbstractCegarLoop]: Abstraction has 291 states and 473 transitions. [2020-07-21 16:00:48,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:00:48,161 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 473 transitions. [2020-07-21 16:00:48,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-21 16:00:48,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:48,165 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 15, 15, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:48,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:48,380 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:48,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:48,381 INFO L82 PathProgramCache]: Analyzing trace with hash 51685547, now seen corresponding path program 20 times [2020-07-21 16:00:48,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:48,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623112544] [2020-07-21 16:00:48,381 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:48,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:48,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:48,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:48,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:48,761 INFO L134 CoverageAnalysis]: Checked inductivity of 1350 backedges. 160 proven. 133 refuted. 0 times theorem prover too weak. 1057 trivial. 0 not checked. [2020-07-21 16:00:48,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:49,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,804 INFO L134 CoverageAnalysis]: Checked inductivity of 1350 backedges. 160 proven. 138 refuted. 0 times theorem prover too weak. 1052 trivial. 0 not checked. [2020-07-21 16:00:49,805 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623112544] [2020-07-21 16:00:49,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:49,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:49,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120638292] [2020-07-21 16:00:49,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:49,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:49,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:49,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:49,806 INFO L87 Difference]: Start difference. First operand 291 states and 473 transitions. Second operand 14 states. [2020-07-21 16:00:49,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:49,983 INFO L93 Difference]: Finished difference Result 355 states and 621 transitions. [2020-07-21 16:00:49,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:49,984 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 225 [2020-07-21 16:00:49,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:49,987 INFO L225 Difference]: With dead ends: 355 [2020-07-21 16:00:49,987 INFO L226 Difference]: Without dead ends: 351 [2020-07-21 16:00:49,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 429 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:49,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-21 16:00:50,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 297. [2020-07-21 16:00:50,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2020-07-21 16:00:50,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 500 transitions. [2020-07-21 16:00:50,009 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 500 transitions. Word has length 225 [2020-07-21 16:00:50,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:50,009 INFO L479 AbstractCegarLoop]: Abstraction has 297 states and 500 transitions. [2020-07-21 16:00:50,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:50,009 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 500 transitions. [2020-07-21 16:00:50,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 16:00:50,012 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:50,012 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:50,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:50,226 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:50,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:50,227 INFO L82 PathProgramCache]: Analyzing trace with hash 120952594, now seen corresponding path program 21 times [2020-07-21 16:00:50,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:50,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [372490953] [2020-07-21 16:00:50,227 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:50,523 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:50,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:50,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:50,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:50,619 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 301 proven. 76 refuted. 0 times theorem prover too weak. 1125 trivial. 0 not checked. [2020-07-21 16:00:50,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:51,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 303 proven. 84 refuted. 0 times theorem prover too weak. 1115 trivial. 0 not checked. [2020-07-21 16:00:52,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [372490953] [2020-07-21 16:00:52,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:52,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:52,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142407193] [2020-07-21 16:00:52,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:52,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:52,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:52,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:52,024 INFO L87 Difference]: Start difference. First operand 297 states and 500 transitions. Second operand 16 states. [2020-07-21 16:00:52,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:52,286 INFO L93 Difference]: Finished difference Result 307 states and 514 transitions. [2020-07-21 16:00:52,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:52,287 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 237 [2020-07-21 16:00:52,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:52,294 INFO L225 Difference]: With dead ends: 307 [2020-07-21 16:00:52,294 INFO L226 Difference]: Without dead ends: 303 [2020-07-21 16:00:52,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 450 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:52,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2020-07-21 16:00:52,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 289. [2020-07-21 16:00:52,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2020-07-21 16:00:52,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 477 transitions. [2020-07-21 16:00:52,312 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 477 transitions. Word has length 237 [2020-07-21 16:00:52,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:52,313 INFO L479 AbstractCegarLoop]: Abstraction has 289 states and 477 transitions. [2020-07-21 16:00:52,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:52,313 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 477 transitions. [2020-07-21 16:00:52,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-21 16:00:52,316 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:52,316 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 17, 17, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:52,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:52,530 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:52,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:52,530 INFO L82 PathProgramCache]: Analyzing trace with hash -1057498309, now seen corresponding path program 6 times [2020-07-21 16:00:52,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:52,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024613033] [2020-07-21 16:00:52,531 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:52,839 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:52,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:52,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:00:52,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:52,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1686 backedges. 86 proven. 445 refuted. 0 times theorem prover too weak. 1155 trivial. 0 not checked. [2020-07-21 16:00:52,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:54,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1686 backedges. 86 proven. 466 refuted. 0 times theorem prover too weak. 1134 trivial. 0 not checked. [2020-07-21 16:00:55,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024613033] [2020-07-21 16:00:55,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:55,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:00:55,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555085705] [2020-07-21 16:00:55,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:00:55,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:55,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:00:55,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:00:55,676 INFO L87 Difference]: Start difference. First operand 289 states and 477 transitions. Second operand 20 states. [2020-07-21 16:00:56,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:56,016 INFO L93 Difference]: Finished difference Result 314 states and 525 transitions. [2020-07-21 16:00:56,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:00:56,017 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 249 [2020-07-21 16:00:56,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:56,020 INFO L225 Difference]: With dead ends: 314 [2020-07-21 16:00:56,020 INFO L226 Difference]: Without dead ends: 310 [2020-07-21 16:00:56,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 466 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:00:56,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2020-07-21 16:00:56,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 279. [2020-07-21 16:00:56,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 279 states. [2020-07-21 16:00:56,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 457 transitions. [2020-07-21 16:00:56,037 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 457 transitions. Word has length 249 [2020-07-21 16:00:56,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:56,038 INFO L479 AbstractCegarLoop]: Abstraction has 279 states and 457 transitions. [2020-07-21 16:00:56,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:00:56,038 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 457 transitions. [2020-07-21 16:00:56,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-21 16:00:56,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:56,041 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 21, 21, 17, 16, 12, 12, 12, 12, 12, 12, 12, 10, 10, 10, 10, 10, 10, 10, 8, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:56,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:56,256 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:56,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:56,257 INFO L82 PathProgramCache]: Analyzing trace with hash -15078143, now seen corresponding path program 22 times [2020-07-21 16:00:56,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:56,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1655198068] [2020-07-21 16:00:56,258 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:56,599 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:56,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:56,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:56,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:56,706 INFO L134 CoverageAnalysis]: Checked inductivity of 2644 backedges. 134 proven. 494 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2020-07-21 16:00:56,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:58,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,861 INFO L134 CoverageAnalysis]: Checked inductivity of 2644 backedges. 134 proven. 510 refuted. 0 times theorem prover too weak. 2000 trivial. 0 not checked. [2020-07-21 16:00:58,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1655198068] [2020-07-21 16:00:58,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:58,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:00:58,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243021588] [2020-07-21 16:00:58,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:00:58,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:58,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:00:58,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:58,863 INFO L87 Difference]: Start difference. First operand 279 states and 457 transitions. Second operand 18 states. [2020-07-21 16:00:59,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:59,163 INFO L93 Difference]: Finished difference Result 326 states and 592 transitions. [2020-07-21 16:00:59,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:00:59,164 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 310 [2020-07-21 16:00:59,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:59,168 INFO L225 Difference]: With dead ends: 326 [2020-07-21 16:00:59,168 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 16:00:59,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 625 GetRequests, 591 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:00:59,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 16:00:59,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 306. [2020-07-21 16:00:59,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 306 states. [2020-07-21 16:00:59,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 550 transitions. [2020-07-21 16:00:59,186 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 550 transitions. Word has length 310 [2020-07-21 16:00:59,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:59,187 INFO L479 AbstractCegarLoop]: Abstraction has 306 states and 550 transitions. [2020-07-21 16:00:59,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:00:59,187 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 550 transitions. [2020-07-21 16:00:59,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2020-07-21 16:00:59,191 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:59,191 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 25, 25, 17, 16, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 12, 8, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:59,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:59,403 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:59,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:59,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1476004175, now seen corresponding path program 23 times [2020-07-21 16:00:59,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:59,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1039366750] [2020-07-21 16:00:59,404 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:59,772 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:59,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:59,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 798 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:59,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:59,917 INFO L134 CoverageAnalysis]: Checked inductivity of 3596 backedges. 182 proven. 558 refuted. 0 times theorem prover too weak. 2856 trivial. 0 not checked. [2020-07-21 16:00:59,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:01,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,375 INFO L134 CoverageAnalysis]: Checked inductivity of 3596 backedges. 182 proven. 574 refuted. 0 times theorem prover too weak. 2840 trivial. 0 not checked. [2020-07-21 16:01:02,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1039366750] [2020-07-21 16:01:02,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:02,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:01:02,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639659321] [2020-07-21 16:01:02,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:01:02,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:02,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:01:02,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:01:02,378 INFO L87 Difference]: Start difference. First operand 306 states and 550 transitions. Second operand 18 states. [2020-07-21 16:01:02,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:02,724 INFO L93 Difference]: Finished difference Result 371 states and 800 transitions. [2020-07-21 16:01:02,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:01:02,725 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 358 [2020-07-21 16:01:02,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:02,729 INFO L225 Difference]: With dead ends: 371 [2020-07-21 16:01:02,730 INFO L226 Difference]: Without dead ends: 367 [2020-07-21 16:01:02,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 721 GetRequests, 687 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:01:02,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2020-07-21 16:01:02,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 306. [2020-07-21 16:01:02,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 306 states. [2020-07-21 16:01:02,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 550 transitions. [2020-07-21 16:01:02,755 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 550 transitions. Word has length 358 [2020-07-21 16:01:02,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:02,755 INFO L479 AbstractCegarLoop]: Abstraction has 306 states and 550 transitions. [2020-07-21 16:01:02,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:01:02,755 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 550 transitions. [2020-07-21 16:01:02,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2020-07-21 16:01:02,759 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:02,759 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 17, 16, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 10, 10, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:02,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:02,975 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:02,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:02,975 INFO L82 PathProgramCache]: Analyzing trace with hash 259094655, now seen corresponding path program 24 times [2020-07-21 16:01:02,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:02,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563194676] [2020-07-21 16:01:02,976 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:03,380 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:03,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:03,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 798 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:03,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:03,511 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 137 proven. 713 refuted. 0 times theorem prover too weak. 2734 trivial. 0 not checked. [2020-07-21 16:01:03,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:05,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,588 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 137 proven. 737 refuted. 0 times theorem prover too weak. 2710 trivial. 0 not checked. [2020-07-21 16:01:06,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563194676] [2020-07-21 16:01:06,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:06,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:01:06,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881027545] [2020-07-21 16:01:06,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:01:06,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:06,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:01:06,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:01:06,590 INFO L87 Difference]: Start difference. First operand 306 states and 550 transitions. Second operand 20 states. [2020-07-21 16:01:06,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:06,943 INFO L93 Difference]: Finished difference Result 346 states and 698 transitions. [2020-07-21 16:01:06,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:01:06,944 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 358 [2020-07-21 16:01:06,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:06,950 INFO L225 Difference]: With dead ends: 346 [2020-07-21 16:01:06,950 INFO L226 Difference]: Without dead ends: 342 [2020-07-21 16:01:06,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 683 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:01:06,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-21 16:01:06,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 296. [2020-07-21 16:01:06,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-21 16:01:06,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 513 transitions. [2020-07-21 16:01:06,971 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 513 transitions. Word has length 358 [2020-07-21 16:01:06,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:06,972 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 513 transitions. [2020-07-21 16:01:06,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:01:06,972 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 513 transitions. [2020-07-21 16:01:06,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2020-07-21 16:01:06,976 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:06,976 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 17, 16, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 12, 10, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:07,189 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:07,190 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:07,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:07,191 INFO L82 PathProgramCache]: Analyzing trace with hash -884966346, now seen corresponding path program 25 times [2020-07-21 16:01:07,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:07,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [800174506] [2020-07-21 16:01:07,191 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:07,590 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:07,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:07,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:07,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:07,709 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 247 proven. 519 refuted. 0 times theorem prover too weak. 3082 trivial. 0 not checked. [2020-07-21 16:01:07,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:09,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,192 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 249 proven. 533 refuted. 0 times theorem prover too weak. 3066 trivial. 0 not checked. [2020-07-21 16:01:10,193 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [800174506] [2020-07-21 16:01:10,193 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:10,193 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:01:10,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341593452] [2020-07-21 16:01:10,194 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:01:10,194 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:10,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:01:10,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:01:10,195 INFO L87 Difference]: Start difference. First operand 296 states and 513 transitions. Second operand 18 states. [2020-07-21 16:01:10,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:10,489 INFO L93 Difference]: Finished difference Result 341 states and 666 transitions. [2020-07-21 16:01:10,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:01:10,490 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 370 [2020-07-21 16:01:10,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:10,494 INFO L225 Difference]: With dead ends: 341 [2020-07-21 16:01:10,494 INFO L226 Difference]: Without dead ends: 337 [2020-07-21 16:01:10,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 745 GetRequests, 711 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:01:10,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-21 16:01:10,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 296. [2020-07-21 16:01:10,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-21 16:01:10,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 513 transitions. [2020-07-21 16:01:10,510 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 513 transitions. Word has length 370 [2020-07-21 16:01:10,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:10,511 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 513 transitions. [2020-07-21 16:01:10,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:01:10,511 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 513 transitions. [2020-07-21 16:01:10,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2020-07-21 16:01:10,513 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:10,514 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 17, 16, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 10, 10, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:10,714 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:10,714 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:10,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:10,715 INFO L82 PathProgramCache]: Analyzing trace with hash -1692365107, now seen corresponding path program 26 times [2020-07-21 16:01:10,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:10,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [363947194] [2020-07-21 16:01:10,716 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:11,151 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:11,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:11,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 798 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:01:11,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:11,269 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 237 proven. 383 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 16:01:11,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:12,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,183 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 237 proven. 393 refuted. 0 times theorem prover too weak. 2954 trivial. 0 not checked. [2020-07-21 16:01:13,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [363947194] [2020-07-21 16:01:13,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:13,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:01:13,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144239318] [2020-07-21 16:01:13,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:01:13,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:13,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:01:13,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:01:13,185 INFO L87 Difference]: Start difference. First operand 296 states and 513 transitions. Second operand 16 states. [2020-07-21 16:01:13,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:13,427 INFO L93 Difference]: Finished difference Result 351 states and 689 transitions. [2020-07-21 16:01:13,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:01:13,428 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 358 [2020-07-21 16:01:13,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:13,431 INFO L225 Difference]: With dead ends: 351 [2020-07-21 16:01:13,431 INFO L226 Difference]: Without dead ends: 347 [2020-07-21 16:01:13,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 720 GetRequests, 691 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:13,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2020-07-21 16:01:13,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 299. [2020-07-21 16:01:13,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2020-07-21 16:01:13,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 520 transitions. [2020-07-21 16:01:13,452 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 520 transitions. Word has length 358 [2020-07-21 16:01:13,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:13,453 INFO L479 AbstractCegarLoop]: Abstraction has 299 states and 520 transitions. [2020-07-21 16:01:13,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:01:13,453 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 520 transitions. [2020-07-21 16:01:13,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2020-07-21 16:01:13,456 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:13,457 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 17, 16, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 12, 10, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:13,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:13,670 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:13,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:13,671 INFO L82 PathProgramCache]: Analyzing trace with hash 1736299190, now seen corresponding path program 27 times [2020-07-21 16:01:13,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:13,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1416261201] [2020-07-21 16:01:13,672 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:14,116 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:14,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:14,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:14,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:14,271 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 379 proven. 387 refuted. 0 times theorem prover too weak. 3082 trivial. 0 not checked. [2020-07-21 16:01:14,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:15,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,773 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 381 proven. 401 refuted. 0 times theorem prover too weak. 3066 trivial. 0 not checked. [2020-07-21 16:01:16,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1416261201] [2020-07-21 16:01:16,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:16,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:01:16,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557290136] [2020-07-21 16:01:16,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:01:16,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:16,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:01:16,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:01:16,775 INFO L87 Difference]: Start difference. First operand 299 states and 520 transitions. Second operand 18 states. [2020-07-21 16:01:17,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:17,048 INFO L93 Difference]: Finished difference Result 309 states and 536 transitions. [2020-07-21 16:01:17,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:01:17,049 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 370 [2020-07-21 16:01:17,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:17,052 INFO L225 Difference]: With dead ends: 309 [2020-07-21 16:01:17,052 INFO L226 Difference]: Without dead ends: 305 [2020-07-21 16:01:17,053 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 745 GetRequests, 711 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:01:17,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-21 16:01:17,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 294. [2020-07-21 16:01:17,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2020-07-21 16:01:17,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 505 transitions. [2020-07-21 16:01:17,070 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 505 transitions. Word has length 370 [2020-07-21 16:01:17,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:17,070 INFO L479 AbstractCegarLoop]: Abstraction has 294 states and 505 transitions. [2020-07-21 16:01:17,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:01:17,071 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 505 transitions. [2020-07-21 16:01:17,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 774 [2020-07-21 16:01:17,078 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:17,079 INFO L422 BasicCegarLoop]: trace histogram [59, 59, 58, 58, 32, 32, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 27, 26, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:17,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:17,292 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:17,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:17,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1565919717, now seen corresponding path program 28 times [2020-07-21 16:01:17,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:17,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1800378093] [2020-07-21 16:01:17,293 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:17,812 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:17,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:17,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 1138 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:01:17,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:18,275 INFO L134 CoverageAnalysis]: Checked inductivity of 17696 backedges. 1140 proven. 2603 refuted. 0 times theorem prover too weak. 13953 trivial. 0 not checked. [2020-07-21 16:01:18,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:21,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:22,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:22,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:22,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:22,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:25,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:25,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:25,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:25,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:25,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:25,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:25,972 INFO L134 CoverageAnalysis]: Checked inductivity of 17696 backedges. 1144 proven. 2636 refuted. 0 times theorem prover too weak. 13916 trivial. 0 not checked. [2020-07-21 16:01:25,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1800378093] [2020-07-21 16:01:25,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:25,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 35 [2020-07-21 16:01:25,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127779503] [2020-07-21 16:01:25,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:01:25,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:25,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:01:25,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1061, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:01:25,975 INFO L87 Difference]: Start difference. First operand 294 states and 505 transitions. Second operand 35 states. [2020-07-21 16:01:27,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:27,899 INFO L93 Difference]: Finished difference Result 669 states and 1332 transitions. [2020-07-21 16:01:27,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 16:01:27,900 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 773 [2020-07-21 16:01:27,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:27,904 INFO L225 Difference]: With dead ends: 669 [2020-07-21 16:01:27,905 INFO L226 Difference]: Without dead ends: 381 [2020-07-21 16:01:27,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1570 GetRequests, 1487 SyntacticMatches, 25 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 740 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=520, Invalid=3020, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 16:01:27,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 381 states. [2020-07-21 16:01:27,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 381 to 323. [2020-07-21 16:01:27,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 323 states. [2020-07-21 16:01:27,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 592 transitions. [2020-07-21 16:01:27,926 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 592 transitions. Word has length 773 [2020-07-21 16:01:27,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:27,926 INFO L479 AbstractCegarLoop]: Abstraction has 323 states and 592 transitions. [2020-07-21 16:01:27,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:01:27,926 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 592 transitions. [2020-07-21 16:01:27,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-21 16:01:27,931 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:27,932 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 35, 35, 26, 25, 19, 19, 19, 19, 19, 19, 19, 17, 17, 17, 17, 17, 17, 17, 12, 10, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:28,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:28,146 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:28,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:28,147 INFO L82 PathProgramCache]: Analyzing trace with hash -1085169499, now seen corresponding path program 29 times [2020-07-21 16:01:28,148 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:28,148 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [752230946] [2020-07-21 16:01:28,148 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:28,602 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:28,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:28,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 737 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:01:28,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:28,880 INFO L134 CoverageAnalysis]: Checked inductivity of 7045 backedges. 3921 proven. 575 refuted. 0 times theorem prover too weak. 2549 trivial. 0 not checked. [2020-07-21 16:01:28,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:31,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,402 INFO L134 CoverageAnalysis]: Checked inductivity of 7045 backedges. 489 proven. 1573 refuted. 0 times theorem prover too weak. 4983 trivial. 0 not checked. [2020-07-21 16:01:34,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [752230946] [2020-07-21 16:01:34,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:34,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 16:01:34,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638924242] [2020-07-21 16:01:34,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:01:34,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:34,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:01:34,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:01:34,404 INFO L87 Difference]: Start difference. First operand 323 states and 592 transitions. Second operand 29 states. [2020-07-21 16:01:35,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:35,796 INFO L93 Difference]: Finished difference Result 660 states and 1253 transitions. [2020-07-21 16:01:35,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-21 16:01:35,797 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 496 [2020-07-21 16:01:35,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:35,800 INFO L225 Difference]: With dead ends: 660 [2020-07-21 16:01:35,800 INFO L226 Difference]: Without dead ends: 342 [2020-07-21 16:01:35,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1015 GetRequests, 941 SyntacticMatches, 23 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 546 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=443, Invalid=2313, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 16:01:35,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-21 16:01:35,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 315. [2020-07-21 16:01:35,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 315 states. [2020-07-21 16:01:35,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 572 transitions. [2020-07-21 16:01:35,818 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 572 transitions. Word has length 496 [2020-07-21 16:01:35,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:35,818 INFO L479 AbstractCegarLoop]: Abstraction has 315 states and 572 transitions. [2020-07-21 16:01:35,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:01:35,818 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 572 transitions. [2020-07-21 16:01:35,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 354 [2020-07-21 16:01:35,821 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:35,821 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 24, 24, 15, 14, 14, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:36,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:36,023 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:36,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:36,024 INFO L82 PathProgramCache]: Analyzing trace with hash 300241207, now seen corresponding path program 6 times [2020-07-21 16:01:36,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:36,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112605874] [2020-07-21 16:01:36,025 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:36,479 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:36,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:36,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:01:36,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:36,676 INFO L134 CoverageAnalysis]: Checked inductivity of 3538 backedges. 772 proven. 314 refuted. 0 times theorem prover too weak. 2452 trivial. 0 not checked. [2020-07-21 16:01:36,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:38,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:39,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:39,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:39,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:39,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:39,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:39,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:39,866 INFO L134 CoverageAnalysis]: Checked inductivity of 3538 backedges. 772 proven. 329 refuted. 0 times theorem prover too weak. 2437 trivial. 0 not checked. [2020-07-21 16:01:39,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112605874] [2020-07-21 16:01:39,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:39,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:01:39,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544507690] [2020-07-21 16:01:39,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:01:39,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:39,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:01:39,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:01:39,868 INFO L87 Difference]: Start difference. First operand 315 states and 572 transitions. Second operand 25 states. [2020-07-21 16:01:40,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:40,890 INFO L93 Difference]: Finished difference Result 682 states and 1297 transitions. [2020-07-21 16:01:40,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 16:01:40,891 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 353 [2020-07-21 16:01:40,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:40,895 INFO L225 Difference]: With dead ends: 682 [2020-07-21 16:01:40,895 INFO L226 Difference]: Without dead ends: 373 [2020-07-21 16:01:40,898 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 664 SyntacticMatches, 19 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 263 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=268, Invalid=1372, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 16:01:40,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 373 states. [2020-07-21 16:01:40,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 373 to 324. [2020-07-21 16:01:40,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 324 states. [2020-07-21 16:01:40,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 570 transitions. [2020-07-21 16:01:40,915 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 570 transitions. Word has length 353 [2020-07-21 16:01:40,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:40,916 INFO L479 AbstractCegarLoop]: Abstraction has 324 states and 570 transitions. [2020-07-21 16:01:40,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:01:40,916 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 570 transitions. [2020-07-21 16:01:40,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2020-07-21 16:01:40,920 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:40,920 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 17, 16, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 12, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:41,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:41,135 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:41,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:41,136 INFO L82 PathProgramCache]: Analyzing trace with hash -562964090, now seen corresponding path program 30 times [2020-07-21 16:01:41,136 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:41,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1092770402] [2020-07-21 16:01:41,137 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:41,650 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:41,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:41,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 879 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:41,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:41,825 INFO L134 CoverageAnalysis]: Checked inductivity of 4404 backedges. 627 proven. 195 refuted. 0 times theorem prover too weak. 3582 trivial. 0 not checked. [2020-07-21 16:01:41,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:42,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:44,588 INFO L134 CoverageAnalysis]: Checked inductivity of 4404 backedges. 631 proven. 207 refuted. 0 times theorem prover too weak. 3566 trivial. 0 not checked. [2020-07-21 16:01:44,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1092770402] [2020-07-21 16:01:44,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:44,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:01:44,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763742962] [2020-07-21 16:01:44,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:01:44,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:44,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:01:44,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:01:44,590 INFO L87 Difference]: Start difference. First operand 324 states and 570 transitions. Second operand 18 states. [2020-07-21 16:01:44,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:44,882 INFO L93 Difference]: Finished difference Result 338 states and 594 transitions. [2020-07-21 16:01:44,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:01:44,883 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 394 [2020-07-21 16:01:44,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:44,887 INFO L225 Difference]: With dead ends: 338 [2020-07-21 16:01:44,887 INFO L226 Difference]: Without dead ends: 334 [2020-07-21 16:01:44,888 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 793 GetRequests, 759 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:01:44,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2020-07-21 16:01:44,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 324. [2020-07-21 16:01:44,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 324 states. [2020-07-21 16:01:44,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 570 transitions. [2020-07-21 16:01:44,904 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 570 transitions. Word has length 394 [2020-07-21 16:01:44,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:44,904 INFO L479 AbstractCegarLoop]: Abstraction has 324 states and 570 transitions. [2020-07-21 16:01:44,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:01:44,905 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 570 transitions. [2020-07-21 16:01:44,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 713 [2020-07-21 16:01:44,911 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:44,911 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 47, 47, 38, 37, 29, 29, 29, 29, 29, 29, 29, 23, 23, 23, 23, 23, 23, 23, 20, 15, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:45,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:45,112 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:45,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:45,113 INFO L82 PathProgramCache]: Analyzing trace with hash -1632402417, now seen corresponding path program 31 times [2020-07-21 16:01:45,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:45,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [26320800] [2020-07-21 16:01:45,114 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:45,671 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:45,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:45,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:01:45,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:46,119 INFO L134 CoverageAnalysis]: Checked inductivity of 14941 backedges. 8068 proven. 1045 refuted. 0 times theorem prover too weak. 5828 trivial. 0 not checked. [2020-07-21 16:01:46,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:50,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:51,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:52,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:52,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,746 INFO L134 CoverageAnalysis]: Checked inductivity of 14941 backedges. 711 proven. 2703 refuted. 0 times theorem prover too weak. 11527 trivial. 0 not checked. [2020-07-21 16:01:53,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [26320800] [2020-07-21 16:01:53,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:53,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 16:01:53,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888204032] [2020-07-21 16:01:53,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:01:53,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:53,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:01:53,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:01:53,748 INFO L87 Difference]: Start difference. First operand 324 states and 570 transitions. Second operand 31 states. [2020-07-21 16:01:55,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:55,925 INFO L93 Difference]: Finished difference Result 741 states and 1433 transitions. [2020-07-21 16:01:55,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 16:01:55,927 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 712 [2020-07-21 16:01:55,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:55,933 INFO L225 Difference]: With dead ends: 741 [2020-07-21 16:01:55,933 INFO L226 Difference]: Without dead ends: 421 [2020-07-21 16:01:55,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1452 GetRequests, 1369 SyntacticMatches, 25 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 747 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=554, Invalid=2986, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 16:01:55,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2020-07-21 16:01:55,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 349. [2020-07-21 16:01:55,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 349 states. [2020-07-21 16:01:55,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 620 transitions. [2020-07-21 16:01:55,953 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 620 transitions. Word has length 712 [2020-07-21 16:01:55,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:55,953 INFO L479 AbstractCegarLoop]: Abstraction has 349 states and 620 transitions. [2020-07-21 16:01:55,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:01:55,953 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 620 transitions. [2020-07-21 16:01:55,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2020-07-21 16:01:55,958 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:55,959 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 28, 28, 17, 16, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:56,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:56,172 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:56,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:56,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1013265924, now seen corresponding path program 32 times [2020-07-21 16:01:56,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:56,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [921103648] [2020-07-21 16:01:56,174 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:56,733 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:56,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:56,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 879 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:01:56,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:56,891 INFO L134 CoverageAnalysis]: Checked inductivity of 4412 backedges. 349 proven. 341 refuted. 0 times theorem prover too weak. 3722 trivial. 0 not checked. [2020-07-21 16:01:56,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:58,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:59,149 INFO L134 CoverageAnalysis]: Checked inductivity of 4412 backedges. 349 proven. 353 refuted. 0 times theorem prover too weak. 3710 trivial. 0 not checked. [2020-07-21 16:01:59,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [921103648] [2020-07-21 16:01:59,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:59,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:01:59,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447700912] [2020-07-21 16:01:59,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:01:59,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:59,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:01:59,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:01:59,151 INFO L87 Difference]: Start difference. First operand 349 states and 620 transitions. Second operand 16 states. [2020-07-21 16:01:59,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:59,385 INFO L93 Difference]: Finished difference Result 399 states and 756 transitions. [2020-07-21 16:01:59,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:01:59,386 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 394 [2020-07-21 16:01:59,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:59,391 INFO L225 Difference]: With dead ends: 399 [2020-07-21 16:01:59,391 INFO L226 Difference]: Without dead ends: 395 [2020-07-21 16:01:59,392 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 792 GetRequests, 763 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:59,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states. [2020-07-21 16:01:59,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 360. [2020-07-21 16:01:59,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 360 states. [2020-07-21 16:01:59,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 650 transitions. [2020-07-21 16:01:59,408 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 650 transitions. Word has length 394 [2020-07-21 16:01:59,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:59,408 INFO L479 AbstractCegarLoop]: Abstraction has 360 states and 650 transitions. [2020-07-21 16:01:59,408 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:01:59,408 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 650 transitions. [2020-07-21 16:01:59,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2020-07-21 16:01:59,411 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:59,411 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 28, 28, 17, 16, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:59,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:59,612 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:59,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:59,613 INFO L82 PathProgramCache]: Analyzing trace with hash -892238268, now seen corresponding path program 33 times [2020-07-21 16:01:59,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:59,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1681726897] [2020-07-21 16:01:59,614 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:00,183 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:00,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:00,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 879 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:02:00,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:00,396 INFO L134 CoverageAnalysis]: Checked inductivity of 4412 backedges. 172 proven. 886 refuted. 0 times theorem prover too weak. 3354 trivial. 0 not checked. [2020-07-21 16:02:00,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:02,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:02,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:05,094 INFO L134 CoverageAnalysis]: Checked inductivity of 4412 backedges. 172 proven. 916 refuted. 0 times theorem prover too weak. 3324 trivial. 0 not checked. [2020-07-21 16:02:05,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1681726897] [2020-07-21 16:02:05,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:05,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:02:05,094 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735640420] [2020-07-21 16:02:05,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:02:05,095 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:05,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:02:05,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:02:05,095 INFO L87 Difference]: Start difference. First operand 360 states and 650 transitions. Second operand 22 states. [2020-07-21 16:02:05,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:05,486 INFO L93 Difference]: Finished difference Result 382 states and 700 transitions. [2020-07-21 16:02:05,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:02:05,487 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 394 [2020-07-21 16:02:05,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:05,491 INFO L225 Difference]: With dead ends: 382 [2020-07-21 16:02:05,491 INFO L226 Difference]: Without dead ends: 378 [2020-07-21 16:02:05,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 795 GetRequests, 751 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:02:05,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-07-21 16:02:05,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 360. [2020-07-21 16:02:05,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 360 states. [2020-07-21 16:02:05,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 650 transitions. [2020-07-21 16:02:05,508 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 650 transitions. Word has length 394 [2020-07-21 16:02:05,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:05,508 INFO L479 AbstractCegarLoop]: Abstraction has 360 states and 650 transitions. [2020-07-21 16:02:05,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:02:05,508 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 650 transitions. [2020-07-21 16:02:05,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 432 [2020-07-21 16:02:05,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:05,512 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 30, 30, 23, 23, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 10, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:05,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:05,713 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:05,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:05,714 INFO L82 PathProgramCache]: Analyzing trace with hash -1854808230, now seen corresponding path program 34 times [2020-07-21 16:02:05,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:05,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635772948] [2020-07-21 16:02:05,715 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:06,285 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:06,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:06,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:02:06,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:06,579 INFO L134 CoverageAnalysis]: Checked inductivity of 5258 backedges. 852 proven. 925 refuted. 0 times theorem prover too weak. 3481 trivial. 0 not checked. [2020-07-21 16:02:06,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:08,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:11,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:11,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:11,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:11,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:11,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:11,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:11,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:12,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:12,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:12,193 INFO L134 CoverageAnalysis]: Checked inductivity of 5258 backedges. 856 proven. 951 refuted. 0 times theorem prover too weak. 3451 trivial. 0 not checked. [2020-07-21 16:02:12,194 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635772948] [2020-07-21 16:02:12,194 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:12,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 16:02:12,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326856050] [2020-07-21 16:02:12,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:02:12,195 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:12,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:02:12,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:02:12,196 INFO L87 Difference]: Start difference. First operand 360 states and 650 transitions. Second operand 31 states. [2020-07-21 16:02:13,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:13,803 INFO L93 Difference]: Finished difference Result 781 states and 1456 transitions. [2020-07-21 16:02:13,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 16:02:13,804 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 431 [2020-07-21 16:02:13,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:13,809 INFO L225 Difference]: With dead ends: 781 [2020-07-21 16:02:13,809 INFO L226 Difference]: Without dead ends: 409 [2020-07-21 16:02:13,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 884 GetRequests, 807 SyntacticMatches, 25 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 582 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=437, Invalid=2425, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 16:02:13,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2020-07-21 16:02:13,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 355. [2020-07-21 16:02:13,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 355 states. [2020-07-21 16:02:13,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 582 transitions. [2020-07-21 16:02:13,832 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 582 transitions. Word has length 431 [2020-07-21 16:02:13,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:13,833 INFO L479 AbstractCegarLoop]: Abstraction has 355 states and 582 transitions. [2020-07-21 16:02:13,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:02:13,833 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 582 transitions. [2020-07-21 16:02:13,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 657 [2020-07-21 16:02:13,840 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:13,840 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 47, 47, 34, 33, 25, 25, 25, 25, 25, 25, 25, 23, 23, 23, 23, 23, 23, 23, 16, 14, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:14,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:14,047 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:14,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:14,048 INFO L82 PathProgramCache]: Analyzing trace with hash 270151801, now seen corresponding path program 35 times [2020-07-21 16:02:14,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:14,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044375045] [2020-07-21 16:02:14,049 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:14,690 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:14,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:14,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 975 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:02:14,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:15,106 INFO L134 CoverageAnalysis]: Checked inductivity of 12525 backedges. 6173 proven. 1013 refuted. 0 times theorem prover too weak. 5339 trivial. 0 not checked. [2020-07-21 16:02:15,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:19,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:19,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:19,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:19,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:19,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:20,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:20,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:20,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:20,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:21,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:22,131 INFO L134 CoverageAnalysis]: Checked inductivity of 12525 backedges. 928 proven. 1939 refuted. 0 times theorem prover too weak. 9658 trivial. 0 not checked. [2020-07-21 16:02:22,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044375045] [2020-07-21 16:02:22,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:22,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 31 [2020-07-21 16:02:22,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730723225] [2020-07-21 16:02:22,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:02:22,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:22,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:02:22,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:02:22,133 INFO L87 Difference]: Start difference. First operand 355 states and 582 transitions. Second operand 31 states. [2020-07-21 16:02:24,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:24,046 INFO L93 Difference]: Finished difference Result 929 states and 1637 transitions. [2020-07-21 16:02:24,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-21 16:02:24,047 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 656 [2020-07-21 16:02:24,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:24,054 INFO L225 Difference]: With dead ends: 929 [2020-07-21 16:02:24,055 INFO L226 Difference]: Without dead ends: 580 [2020-07-21 16:02:24,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1338 GetRequests, 1261 SyntacticMatches, 21 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=506, Invalid=2800, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 16:02:24,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2020-07-21 16:02:24,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 487. [2020-07-21 16:02:24,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 487 states. [2020-07-21 16:02:24,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 858 transitions. [2020-07-21 16:02:24,080 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 858 transitions. Word has length 656 [2020-07-21 16:02:24,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:24,080 INFO L479 AbstractCegarLoop]: Abstraction has 487 states and 858 transitions. [2020-07-21 16:02:24,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:02:24,080 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 858 transitions. [2020-07-21 16:02:24,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 790 [2020-07-21 16:02:24,088 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:24,088 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 57, 57, 41, 39, 30, 30, 30, 30, 30, 30, 30, 28, 28, 28, 28, 28, 28, 28, 21, 16, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:24,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:24,290 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:24,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:24,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1433591579, now seen corresponding path program 36 times [2020-07-21 16:02:24,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:24,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1994722180] [2020-07-21 16:02:24,292 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:25,051 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:25,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:25,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 1169 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:02:25,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:25,513 INFO L134 CoverageAnalysis]: Checked inductivity of 18277 backedges. 9029 proven. 618 refuted. 0 times theorem prover too weak. 8630 trivial. 0 not checked. [2020-07-21 16:02:25,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:31,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:31,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:31,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:31,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:31,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:31,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:31,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:34,301 INFO L134 CoverageAnalysis]: Checked inductivity of 18277 backedges. 718 proven. 2934 refuted. 0 times theorem prover too weak. 14625 trivial. 0 not checked. [2020-07-21 16:02:34,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1994722180] [2020-07-21 16:02:34,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:34,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 16:02:34,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361918193] [2020-07-21 16:02:34,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:02:34,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:34,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:02:34,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:02:34,303 INFO L87 Difference]: Start difference. First operand 487 states and 858 transitions. Second operand 29 states. [2020-07-21 16:02:35,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:35,882 INFO L93 Difference]: Finished difference Result 1017 states and 1830 transitions. [2020-07-21 16:02:35,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-21 16:02:35,883 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 789 [2020-07-21 16:02:35,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:35,889 INFO L225 Difference]: With dead ends: 1017 [2020-07-21 16:02:35,889 INFO L226 Difference]: Without dead ends: 535 [2020-07-21 16:02:35,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1601 GetRequests, 1527 SyntacticMatches, 23 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 542 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=443, Invalid=2313, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 16:02:35,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2020-07-21 16:02:35,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 431. [2020-07-21 16:02:35,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 431 states. [2020-07-21 16:02:35,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 740 transitions. [2020-07-21 16:02:35,911 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 740 transitions. Word has length 789 [2020-07-21 16:02:35,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:35,912 INFO L479 AbstractCegarLoop]: Abstraction has 431 states and 740 transitions. [2020-07-21 16:02:35,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:02:35,912 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 740 transitions. [2020-07-21 16:02:35,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 521 [2020-07-21 16:02:35,916 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:35,917 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 35, 35, 26, 25, 21, 21, 21, 21, 21, 21, 21, 17, 17, 17, 17, 17, 17, 17, 16, 10, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:36,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:36,118 INFO L427 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:36,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:36,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1393770295, now seen corresponding path program 37 times [2020-07-21 16:02:36,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:36,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461588200] [2020-07-21 16:02:36,120 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:36,851 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:36,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:36,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 1158 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:02:36,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:37,181 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 234 proven. 1257 refuted. 0 times theorem prover too weak. 6342 trivial. 0 not checked. [2020-07-21 16:02:37,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:40,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:40,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:41,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:42,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:42,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:42,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:42,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:42,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:42,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:42,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:43,105 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 234 proven. 1290 refuted. 0 times theorem prover too weak. 6309 trivial. 0 not checked. [2020-07-21 16:02:43,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461588200] [2020-07-21 16:02:43,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:43,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:02:43,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018147501] [2020-07-21 16:02:43,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:02:43,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:43,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:02:43,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:02:43,106 INFO L87 Difference]: Start difference. First operand 431 states and 740 transitions. Second operand 22 states. [2020-07-21 16:02:43,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:43,528 INFO L93 Difference]: Finished difference Result 443 states and 761 transitions. [2020-07-21 16:02:43,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:02:43,530 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 520 [2020-07-21 16:02:43,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:43,535 INFO L225 Difference]: With dead ends: 443 [2020-07-21 16:02:43,535 INFO L226 Difference]: Without dead ends: 439 [2020-07-21 16:02:43,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1047 GetRequests, 1003 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:02:43,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2020-07-21 16:02:43,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 436. [2020-07-21 16:02:43,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 436 states. [2020-07-21 16:02:43,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 436 states to 436 states and 751 transitions. [2020-07-21 16:02:43,606 INFO L78 Accepts]: Start accepts. Automaton has 436 states and 751 transitions. Word has length 520 [2020-07-21 16:02:43,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:43,607 INFO L479 AbstractCegarLoop]: Abstraction has 436 states and 751 transitions. [2020-07-21 16:02:43,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:02:43,607 INFO L276 IsEmpty]: Start isEmpty. Operand 436 states and 751 transitions. [2020-07-21 16:02:43,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-07-21 16:02:43,612 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:43,613 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 26, 25, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 10, 10, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:43,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:43,827 INFO L427 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:43,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:43,828 INFO L82 PathProgramCache]: Analyzing trace with hash -972039054, now seen corresponding path program 38 times [2020-07-21 16:02:43,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:43,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [991544962] [2020-07-21 16:02:43,829 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:44,575 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:44,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:44,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 1077 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:02:44,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:44,825 INFO L134 CoverageAnalysis]: Checked inductivity of 6681 backedges. 285 proven. 921 refuted. 0 times theorem prover too weak. 5475 trivial. 0 not checked. [2020-07-21 16:02:44,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:47,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:48,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:48,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:48,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,889 INFO L134 CoverageAnalysis]: Checked inductivity of 6681 backedges. 285 proven. 945 refuted. 0 times theorem prover too weak. 5451 trivial. 0 not checked. [2020-07-21 16:02:49,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [991544962] [2020-07-21 16:02:49,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:49,890 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:02:49,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91626751] [2020-07-21 16:02:49,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:02:49,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:49,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:02:49,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:02:49,891 INFO L87 Difference]: Start difference. First operand 436 states and 751 transitions. Second operand 20 states. [2020-07-21 16:02:50,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:50,340 INFO L93 Difference]: Finished difference Result 537 states and 983 transitions. [2020-07-21 16:02:50,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:02:50,341 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 484 [2020-07-21 16:02:50,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:50,349 INFO L225 Difference]: With dead ends: 537 [2020-07-21 16:02:50,349 INFO L226 Difference]: Without dead ends: 533 [2020-07-21 16:02:50,350 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 935 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:02:50,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2020-07-21 16:02:50,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 479. [2020-07-21 16:02:50,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 479 states. [2020-07-21 16:02:50,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 850 transitions. [2020-07-21 16:02:50,379 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 850 transitions. Word has length 484 [2020-07-21 16:02:50,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:50,380 INFO L479 AbstractCegarLoop]: Abstraction has 479 states and 850 transitions. [2020-07-21 16:02:50,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:02:50,380 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 850 transitions. [2020-07-21 16:02:50,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-21 16:02:50,386 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:50,386 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 33, 33, 26, 25, 20, 20, 20, 20, 20, 20, 20, 16, 16, 16, 16, 16, 16, 16, 14, 10, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:50,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:50,600 INFO L427 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:50,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:50,601 INFO L82 PathProgramCache]: Analyzing trace with hash -649609831, now seen corresponding path program 39 times [2020-07-21 16:02:50,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:50,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659046759] [2020-07-21 16:02:50,602 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:51,375 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:51,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:51,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 1104 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:02:51,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:51,566 INFO L134 CoverageAnalysis]: Checked inductivity of 7097 backedges. 328 proven. 750 refuted. 0 times theorem prover too weak. 6019 trivial. 0 not checked. [2020-07-21 16:02:51,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:53,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:54,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:54,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:54,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:55,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:55,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:55,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:55,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:55,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:55,726 INFO L134 CoverageAnalysis]: Checked inductivity of 7097 backedges. 328 proven. 766 refuted. 0 times theorem prover too weak. 6003 trivial. 0 not checked. [2020-07-21 16:02:55,726 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659046759] [2020-07-21 16:02:55,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:55,726 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:02:55,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340668217] [2020-07-21 16:02:55,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:02:55,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:55,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:02:55,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:02:55,728 INFO L87 Difference]: Start difference. First operand 479 states and 850 transitions. Second operand 18 states. [2020-07-21 16:02:56,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:56,092 INFO L93 Difference]: Finished difference Result 613 states and 1213 transitions. [2020-07-21 16:02:56,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:02:56,094 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 496 [2020-07-21 16:02:56,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:56,101 INFO L225 Difference]: With dead ends: 613 [2020-07-21 16:02:56,101 INFO L226 Difference]: Without dead ends: 609 [2020-07-21 16:02:56,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 997 GetRequests, 963 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:02:56,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 609 states. [2020-07-21 16:02:56,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 609 to 497. [2020-07-21 16:02:56,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 497 states. [2020-07-21 16:02:56,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 919 transitions. [2020-07-21 16:02:56,126 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 919 transitions. Word has length 496 [2020-07-21 16:02:56,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:56,126 INFO L479 AbstractCegarLoop]: Abstraction has 497 states and 919 transitions. [2020-07-21 16:02:56,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:02:56,126 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 919 transitions. [2020-07-21 16:02:56,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 521 [2020-07-21 16:02:56,130 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:56,131 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 37, 37, 26, 25, 20, 20, 20, 20, 20, 20, 20, 18, 18, 18, 18, 18, 18, 18, 14, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:56,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:56,332 INFO L427 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:56,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:56,333 INFO L82 PathProgramCache]: Analyzing trace with hash 688438603, now seen corresponding path program 40 times [2020-07-21 16:02:56,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:56,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1339824626] [2020-07-21 16:02:56,334 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:57,125 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:57,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:57,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 1158 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:02:57,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:57,342 INFO L134 CoverageAnalysis]: Checked inductivity of 7781 backedges. 274 proven. 1028 refuted. 0 times theorem prover too weak. 6479 trivial. 0 not checked. [2020-07-21 16:02:57,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:00,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,554 INFO L134 CoverageAnalysis]: Checked inductivity of 7781 backedges. 274 proven. 1052 refuted. 0 times theorem prover too weak. 6455 trivial. 0 not checked. [2020-07-21 16:03:02,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1339824626] [2020-07-21 16:03:02,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:02,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:03:02,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073531578] [2020-07-21 16:03:02,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:03:02,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:02,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:03:02,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:03:02,557 INFO L87 Difference]: Start difference. First operand 497 states and 919 transitions. Second operand 20 states. [2020-07-21 16:03:02,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:02,979 INFO L93 Difference]: Finished difference Result 594 states and 1127 transitions. [2020-07-21 16:03:02,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:03:02,982 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 520 [2020-07-21 16:03:02,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:02,990 INFO L225 Difference]: With dead ends: 594 [2020-07-21 16:03:02,991 INFO L226 Difference]: Without dead ends: 590 [2020-07-21 16:03:02,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1046 GetRequests, 1007 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:03:02,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2020-07-21 16:03:03,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 499. [2020-07-21 16:03:03,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 499 states. [2020-07-21 16:03:03,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 907 transitions. [2020-07-21 16:03:03,031 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 907 transitions. Word has length 520 [2020-07-21 16:03:03,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:03,032 INFO L479 AbstractCegarLoop]: Abstraction has 499 states and 907 transitions. [2020-07-21 16:03:03,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:03:03,033 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 907 transitions. [2020-07-21 16:03:03,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 533 [2020-07-21 16:03:03,043 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:03,044 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 37, 37, 26, 25, 21, 21, 21, 21, 21, 21, 21, 18, 18, 18, 18, 18, 18, 18, 16, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:03,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:03,257 INFO L427 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:03,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:03,258 INFO L82 PathProgramCache]: Analyzing trace with hash -2024642110, now seen corresponding path program 41 times [2020-07-21 16:03:03,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:03,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328957998] [2020-07-21 16:03:03,258 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:04,230 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:03:04,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:04,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 1185 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:03:04,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:04,667 INFO L134 CoverageAnalysis]: Checked inductivity of 8185 backedges. 482 proven. 850 refuted. 0 times theorem prover too weak. 6853 trivial. 0 not checked. [2020-07-21 16:03:04,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:07,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:08,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:08,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:08,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:09,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:09,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:09,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:09,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:09,907 INFO L134 CoverageAnalysis]: Checked inductivity of 8185 backedges. 484 proven. 872 refuted. 0 times theorem prover too weak. 6829 trivial. 0 not checked. [2020-07-21 16:03:09,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328957998] [2020-07-21 16:03:09,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:09,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:03:09,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072485090] [2020-07-21 16:03:09,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:03:09,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:09,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:03:09,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:03:09,909 INFO L87 Difference]: Start difference. First operand 499 states and 907 transitions. Second operand 20 states. [2020-07-21 16:03:10,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:10,375 INFO L93 Difference]: Finished difference Result 555 states and 1072 transitions. [2020-07-21 16:03:10,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:03:10,377 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 532 [2020-07-21 16:03:10,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:10,383 INFO L225 Difference]: With dead ends: 555 [2020-07-21 16:03:10,383 INFO L226 Difference]: Without dead ends: 551 [2020-07-21 16:03:10,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1070 GetRequests, 1031 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:03:10,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2020-07-21 16:03:10,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 492. [2020-07-21 16:03:10,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 492 states. [2020-07-21 16:03:10,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 896 transitions. [2020-07-21 16:03:10,411 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 896 transitions. Word has length 532 [2020-07-21 16:03:10,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:10,411 INFO L479 AbstractCegarLoop]: Abstraction has 492 states and 896 transitions. [2020-07-21 16:03:10,411 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:03:10,411 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 896 transitions. [2020-07-21 16:03:10,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 605 [2020-07-21 16:03:10,416 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:10,416 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 45, 45, 26, 25, 23, 23, 23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 22, 22, 20, 20, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:10,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:10,617 INFO L427 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:10,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:10,618 INFO L82 PathProgramCache]: Analyzing trace with hash -781459806, now seen corresponding path program 42 times [2020-07-21 16:03:10,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:10,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [106678501] [2020-07-21 16:03:10,619 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:11,457 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:03:11,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:11,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 1347 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:03:11,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:11,728 INFO L134 CoverageAnalysis]: Checked inductivity of 10661 backedges. 472 proven. 850 refuted. 0 times theorem prover too weak. 9339 trivial. 0 not checked. [2020-07-21 16:03:11,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:14,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:16,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:16,797 INFO L134 CoverageAnalysis]: Checked inductivity of 10661 backedges. 472 proven. 868 refuted. 0 times theorem prover too weak. 9321 trivial. 0 not checked. [2020-07-21 16:03:16,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [106678501] [2020-07-21 16:03:16,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:16,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:03:16,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588413855] [2020-07-21 16:03:16,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:03:16,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:16,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:03:16,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:03:16,799 INFO L87 Difference]: Start difference. First operand 492 states and 896 transitions. Second operand 18 states. [2020-07-21 16:03:17,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:17,171 INFO L93 Difference]: Finished difference Result 556 states and 1101 transitions. [2020-07-21 16:03:17,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:03:17,173 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 604 [2020-07-21 16:03:17,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:17,179 INFO L225 Difference]: With dead ends: 556 [2020-07-21 16:03:17,180 INFO L226 Difference]: Without dead ends: 552 [2020-07-21 16:03:17,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1213 GetRequests, 1179 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:03:17,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 552 states. [2020-07-21 16:03:17,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 552 to 495. [2020-07-21 16:03:17,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 495 states. [2020-07-21 16:03:17,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 495 states to 495 states and 910 transitions. [2020-07-21 16:03:17,205 INFO L78 Accepts]: Start accepts. Automaton has 495 states and 910 transitions. Word has length 604 [2020-07-21 16:03:17,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:17,205 INFO L479 AbstractCegarLoop]: Abstraction has 495 states and 910 transitions. [2020-07-21 16:03:17,206 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:03:17,206 INFO L276 IsEmpty]: Start isEmpty. Operand 495 states and 910 transitions. [2020-07-21 16:03:17,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 584 [2020-07-21 16:03:17,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:17,210 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 42, 42, 27, 27, 22, 22, 22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 21, 18, 15, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:17,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:17,413 INFO L427 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:17,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:17,415 INFO L82 PathProgramCache]: Analyzing trace with hash -16346874, now seen corresponding path program 43 times [2020-07-21 16:03:17,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:17,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1322926641] [2020-07-21 16:03:17,416 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:18,239 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:03:18,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:18,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 1299 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:03:18,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:18,488 INFO L134 CoverageAnalysis]: Checked inductivity of 9870 backedges. 758 proven. 729 refuted. 0 times theorem prover too weak. 8383 trivial. 0 not checked. [2020-07-21 16:03:18,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:21,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:21,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:22,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:22,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:22,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:22,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:22,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:22,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:22,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:23,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:23,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:24,385 INFO L134 CoverageAnalysis]: Checked inductivity of 9870 backedges. 762 proven. 749 refuted. 0 times theorem prover too weak. 8359 trivial. 0 not checked. [2020-07-21 16:03:24,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1322926641] [2020-07-21 16:03:24,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:24,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:03:24,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097817366] [2020-07-21 16:03:24,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:03:24,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:24,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:03:24,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:03:24,388 INFO L87 Difference]: Start difference. First operand 495 states and 910 transitions. Second operand 20 states. [2020-07-21 16:03:24,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:24,832 INFO L93 Difference]: Finished difference Result 522 states and 983 transitions. [2020-07-21 16:03:24,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:03:24,834 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 583 [2020-07-21 16:03:24,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:24,840 INFO L225 Difference]: With dead ends: 522 [2020-07-21 16:03:24,840 INFO L226 Difference]: Without dead ends: 518 [2020-07-21 16:03:24,841 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1172 GetRequests, 1133 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:03:24,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2020-07-21 16:03:24,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 500. [2020-07-21 16:03:24,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 500 states. [2020-07-21 16:03:24,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 926 transitions. [2020-07-21 16:03:24,863 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 926 transitions. Word has length 583 [2020-07-21 16:03:24,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:24,864 INFO L479 AbstractCegarLoop]: Abstraction has 500 states and 926 transitions. [2020-07-21 16:03:24,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:03:24,864 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 926 transitions. [2020-07-21 16:03:24,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 629 [2020-07-21 16:03:24,869 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:24,869 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 47, 47, 26, 25, 24, 24, 24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 23, 22, 22, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:25,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:25,070 INFO L427 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:25,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:25,071 INFO L82 PathProgramCache]: Analyzing trace with hash 529891438, now seen corresponding path program 44 times [2020-07-21 16:03:25,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:25,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [860268987] [2020-07-21 16:03:25,072 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:25,954 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:03:25,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:25,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 1401 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:03:25,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:26,225 INFO L134 CoverageAnalysis]: Checked inductivity of 11577 backedges. 1223 proven. 379 refuted. 0 times theorem prover too weak. 9975 trivial. 0 not checked. [2020-07-21 16:03:26,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:27,570 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:03:28,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:28,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:29,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:29,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:29,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:29,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:30,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:30,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:30,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:30,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:30,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,761 INFO L134 CoverageAnalysis]: Checked inductivity of 11577 backedges. 1227 proven. 399 refuted. 0 times theorem prover too weak. 9951 trivial. 0 not checked. [2020-07-21 16:03:32,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [860268987] [2020-07-21 16:03:32,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:32,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:03:32,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371904796] [2020-07-21 16:03:32,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:03:32,763 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:32,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:03:32,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:03:32,764 INFO L87 Difference]: Start difference. First operand 500 states and 926 transitions. Second operand 20 states. [2020-07-21 16:03:33,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:33,243 INFO L93 Difference]: Finished difference Result 532 states and 1022 transitions. [2020-07-21 16:03:33,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:03:33,244 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 628 [2020-07-21 16:03:33,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:33,250 INFO L225 Difference]: With dead ends: 532 [2020-07-21 16:03:33,251 INFO L226 Difference]: Without dead ends: 528 [2020-07-21 16:03:33,252 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1263 GetRequests, 1224 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:03:33,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2020-07-21 16:03:33,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 490. [2020-07-21 16:03:33,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2020-07-21 16:03:33,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 872 transitions. [2020-07-21 16:03:33,274 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 872 transitions. Word has length 628 [2020-07-21 16:03:33,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:33,274 INFO L479 AbstractCegarLoop]: Abstraction has 490 states and 872 transitions. [2020-07-21 16:03:33,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:03:33,274 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 872 transitions. [2020-07-21 16:03:33,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1697 [2020-07-21 16:03:33,297 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:33,298 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 120, 120, 86, 85, 66, 66, 66, 66, 66, 66, 66, 60, 60, 60, 60, 60, 60, 60, 48, 34, 25, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:33,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:33,499 INFO L427 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:33,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:33,500 INFO L82 PathProgramCache]: Analyzing trace with hash 216332435, now seen corresponding path program 45 times [2020-07-21 16:03:33,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:33,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473969710] [2020-07-21 16:03:33,501 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:34,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:03:34,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:34,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 2504 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:03:34,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:35,886 INFO L134 CoverageAnalysis]: Checked inductivity of 86557 backedges. 35284 proven. 650 refuted. 0 times theorem prover too weak. 50623 trivial. 0 not checked. [2020-07-21 16:03:35,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:49,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:49,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:49,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:50,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:50,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:50,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:51,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:51,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:51,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:51,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:51,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:51,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:51,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:53,321 INFO L134 CoverageAnalysis]: Checked inductivity of 86557 backedges. 1380 proven. 5888 refuted. 0 times theorem prover too weak. 79289 trivial. 0 not checked. [2020-07-21 16:03:53,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473969710] [2020-07-21 16:03:53,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:53,322 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 16:03:53,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276842827] [2020-07-21 16:03:53,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:03:53,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:53,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:03:53,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:03:53,324 INFO L87 Difference]: Start difference. First operand 490 states and 872 transitions. Second operand 27 states. [2020-07-21 16:03:55,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:55,653 INFO L93 Difference]: Finished difference Result 1101 states and 2064 transitions. [2020-07-21 16:03:55,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-21 16:03:55,655 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 1696 [2020-07-21 16:03:55,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:55,663 INFO L225 Difference]: With dead ends: 1101 [2020-07-21 16:03:55,663 INFO L226 Difference]: Without dead ends: 580 [2020-07-21 16:03:55,668 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3415 GetRequests, 3345 SyntacticMatches, 21 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=415, Invalid=2135, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 16:03:55,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2020-07-21 16:03:55,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 508. [2020-07-21 16:03:55,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 508 states. [2020-07-21 16:03:55,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 508 states to 508 states and 937 transitions. [2020-07-21 16:03:55,693 INFO L78 Accepts]: Start accepts. Automaton has 508 states and 937 transitions. Word has length 1696 [2020-07-21 16:03:55,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:55,694 INFO L479 AbstractCegarLoop]: Abstraction has 508 states and 937 transitions. [2020-07-21 16:03:55,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:03:55,694 INFO L276 IsEmpty]: Start isEmpty. Operand 508 states and 937 transitions. [2020-07-21 16:03:55,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1213 [2020-07-21 16:03:55,706 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:55,707 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 88, 88, 60, 59, 46, 46, 46, 46, 46, 46, 46, 44, 44, 44, 44, 44, 44, 44, 34, 28, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:55,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:55,908 INFO L427 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:55,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:55,909 INFO L82 PathProgramCache]: Analyzing trace with hash -1325810975, now seen corresponding path program 46 times [2020-07-21 16:03:55,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:55,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [826318439] [2020-07-21 16:03:55,910 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:56,923 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:03:56,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:56,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 1788 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:03:56,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:57,892 INFO L134 CoverageAnalysis]: Checked inductivity of 43829 backedges. 21980 proven. 1403 refuted. 0 times theorem prover too weak. 20446 trivial. 0 not checked. [2020-07-21 16:03:57,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:08,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:08,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:08,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:08,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:09,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:09,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:09,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:09,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:11,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:11,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:12,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:13,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:13,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:13,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:13,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:13,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:13,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:14,394 INFO L134 CoverageAnalysis]: Checked inductivity of 43829 backedges. 1065 proven. 5392 refuted. 0 times theorem prover too weak. 37372 trivial. 0 not checked. [2020-07-21 16:04:14,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [826318439] [2020-07-21 16:04:14,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:14,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-21 16:04:14,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415833668] [2020-07-21 16:04:14,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:04:14,397 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:14,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:04:14,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:04:14,397 INFO L87 Difference]: Start difference. First operand 508 states and 937 transitions. Second operand 33 states. [2020-07-21 16:04:17,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:17,436 INFO L93 Difference]: Finished difference Result 1064 states and 2032 transitions. [2020-07-21 16:04:17,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 16:04:17,438 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 1212 [2020-07-21 16:04:17,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:17,447 INFO L225 Difference]: With dead ends: 1064 [2020-07-21 16:04:17,447 INFO L226 Difference]: Without dead ends: 561 [2020-07-21 16:04:17,451 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2453 GetRequests, 2365 SyntacticMatches, 27 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 847 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=595, Invalid=3311, Unknown=0, NotChecked=0, Total=3906 [2020-07-21 16:04:17,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 561 states. [2020-07-21 16:04:17,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 561 to 484. [2020-07-21 16:04:17,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 484 states. [2020-07-21 16:04:17,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 873 transitions. [2020-07-21 16:04:17,475 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 873 transitions. Word has length 1212 [2020-07-21 16:04:17,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:17,476 INFO L479 AbstractCegarLoop]: Abstraction has 484 states and 873 transitions. [2020-07-21 16:04:17,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:04:17,476 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 873 transitions. [2020-07-21 16:04:17,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-21 16:04:17,486 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:17,486 INFO L422 BasicCegarLoop]: trace histogram [66, 66, 63, 63, 46, 44, 33, 33, 33, 33, 33, 33, 33, 31, 31, 31, 31, 31, 31, 31, 20, 19, 15, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:17,701 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:17,702 INFO L427 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:17,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:17,703 INFO L82 PathProgramCache]: Analyzing trace with hash -1066004817, now seen corresponding path program 47 times [2020-07-21 16:04:17,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:17,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900045868] [2020-07-21 16:04:17,704 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:18,718 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:04:18,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:18,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 1291 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:04:18,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:19,198 INFO L134 CoverageAnalysis]: Checked inductivity of 22345 backedges. 7940 proven. 207 refuted. 0 times theorem prover too weak. 14198 trivial. 0 not checked. [2020-07-21 16:04:19,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:27,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:27,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:27,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:27,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:27,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:28,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:28,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:28,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:28,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:28,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:29,024 INFO L134 CoverageAnalysis]: Checked inductivity of 22345 backedges. 628 proven. 2676 refuted. 0 times theorem prover too weak. 19041 trivial. 0 not checked. [2020-07-21 16:04:29,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900045868] [2020-07-21 16:04:29,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:29,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:04:29,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48373091] [2020-07-21 16:04:29,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:04:29,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:29,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:04:29,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:04:29,027 INFO L87 Difference]: Start difference. First operand 484 states and 873 transitions. Second operand 23 states. [2020-07-21 16:04:30,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:30,193 INFO L93 Difference]: Finished difference Result 937 states and 1724 transitions. [2020-07-21 16:04:30,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 16:04:30,195 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 871 [2020-07-21 16:04:30,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:30,200 INFO L225 Difference]: With dead ends: 937 [2020-07-21 16:04:30,200 INFO L226 Difference]: Without dead ends: 447 [2020-07-21 16:04:30,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1755 GetRequests, 1703 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=220, Invalid=1112, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:04:30,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2020-07-21 16:04:30,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 405. [2020-07-21 16:04:30,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 405 states. [2020-07-21 16:04:30,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 650 transitions. [2020-07-21 16:04:30,229 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 650 transitions. Word has length 871 [2020-07-21 16:04:30,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:30,230 INFO L479 AbstractCegarLoop]: Abstraction has 405 states and 650 transitions. [2020-07-21 16:04:30,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:04:30,230 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 650 transitions. [2020-07-21 16:04:30,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 846 [2020-07-21 16:04:30,238 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:30,238 INFO L422 BasicCegarLoop]: trace histogram [64, 64, 61, 61, 44, 44, 32, 32, 32, 32, 32, 32, 32, 30, 30, 30, 30, 30, 30, 30, 20, 17, 14, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:30,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:30,439 INFO L427 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:30,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:30,441 INFO L82 PathProgramCache]: Analyzing trace with hash -886374717, now seen corresponding path program 48 times [2020-07-21 16:04:30,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:30,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [514377318] [2020-07-21 16:04:30,442 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:31,512 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:31,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:31,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 1880 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:04:31,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:32,113 INFO L134 CoverageAnalysis]: Checked inductivity of 21000 backedges. 387 proven. 2460 refuted. 0 times theorem prover too weak. 18153 trivial. 0 not checked. [2020-07-21 16:04:32,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:38,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:40,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:42,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:42,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:43,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:43,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:44,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:45,065 INFO L134 CoverageAnalysis]: Checked inductivity of 21000 backedges. 387 proven. 2504 refuted. 0 times theorem prover too weak. 18109 trivial. 0 not checked. [2020-07-21 16:04:45,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [514377318] [2020-07-21 16:04:45,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:45,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-21 16:04:45,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434760732] [2020-07-21 16:04:45,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 16:04:45,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:45,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 16:04:45,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:04:45,068 INFO L87 Difference]: Start difference. First operand 405 states and 650 transitions. Second operand 24 states. [2020-07-21 16:04:45,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:45,818 INFO L93 Difference]: Finished difference Result 436 states and 732 transitions. [2020-07-21 16:04:45,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:04:45,820 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 845 [2020-07-21 16:04:45,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:45,825 INFO L225 Difference]: With dead ends: 436 [2020-07-21 16:04:45,826 INFO L226 Difference]: Without dead ends: 432 [2020-07-21 16:04:45,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1698 GetRequests, 1649 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:04:45,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2020-07-21 16:04:45,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 424. [2020-07-21 16:04:45,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 424 states. [2020-07-21 16:04:45,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 711 transitions. [2020-07-21 16:04:45,848 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 711 transitions. Word has length 845 [2020-07-21 16:04:45,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:45,849 INFO L479 AbstractCegarLoop]: Abstraction has 424 states and 711 transitions. [2020-07-21 16:04:45,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 16:04:45,849 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 711 transitions. [2020-07-21 16:04:45,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1172 [2020-07-21 16:04:45,860 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:45,861 INFO L422 BasicCegarLoop]: trace histogram [92, 92, 83, 83, 58, 56, 46, 46, 46, 46, 46, 46, 46, 41, 41, 41, 41, 41, 41, 41, 36, 25, 15, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:46,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:46,062 INFO L427 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:46,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:46,063 INFO L82 PathProgramCache]: Analyzing trace with hash 244379164, now seen corresponding path program 49 times [2020-07-21 16:04:46,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:46,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [176239114] [2020-07-21 16:04:46,064 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:47,188 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:04:47,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:47,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 1729 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:04:47,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:48,014 INFO L134 CoverageAnalysis]: Checked inductivity of 40969 backedges. 21362 proven. 1970 refuted. 0 times theorem prover too weak. 17637 trivial. 0 not checked. [2020-07-21 16:04:48,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:56,078 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-21 16:04:59,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:00,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:00,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:01,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:01,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:01,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:01,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:01,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:01,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:01,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:04,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:04,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:05,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:05,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:06,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:06,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:06,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:06,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:06,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:07,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:07,807 INFO L134 CoverageAnalysis]: Checked inductivity of 40969 backedges. 1645 proven. 4622 refuted. 0 times theorem prover too weak. 34702 trivial. 0 not checked. [2020-07-21 16:05:07,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [176239114] [2020-07-21 16:05:07,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:07,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-21 16:05:07,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040194359] [2020-07-21 16:05:07,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:05:07,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:07,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:05:07,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:05:07,810 INFO L87 Difference]: Start difference. First operand 424 states and 711 transitions. Second operand 33 states. [2020-07-21 16:05:11,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:11,683 INFO L93 Difference]: Finished difference Result 1052 states and 2060 transitions. [2020-07-21 16:05:11,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-07-21 16:05:11,685 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 1171 [2020-07-21 16:05:11,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:11,691 INFO L225 Difference]: With dead ends: 1052 [2020-07-21 16:05:11,692 INFO L226 Difference]: Without dead ends: 607 [2020-07-21 16:05:11,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2373 GetRequests, 2283 SyntacticMatches, 27 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=635, Invalid=3525, Unknown=0, NotChecked=0, Total=4160 [2020-07-21 16:05:11,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2020-07-21 16:05:11,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 546. [2020-07-21 16:05:11,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 546 states. [2020-07-21 16:05:11,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 546 states to 546 states and 1071 transitions. [2020-07-21 16:05:11,722 INFO L78 Accepts]: Start accepts. Automaton has 546 states and 1071 transitions. Word has length 1171 [2020-07-21 16:05:11,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:11,722 INFO L479 AbstractCegarLoop]: Abstraction has 546 states and 1071 transitions. [2020-07-21 16:05:11,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:05:11,722 INFO L276 IsEmpty]: Start isEmpty. Operand 546 states and 1071 transitions. [2020-07-21 16:05:11,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1148 [2020-07-21 16:05:11,732 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:11,733 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 73, 73, 58, 56, 49, 49, 49, 49, 49, 49, 49, 42, 36, 36, 36, 36, 36, 36, 36, 20, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:11,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:11,934 INFO L427 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:11,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:11,935 INFO L82 PathProgramCache]: Analyzing trace with hash 565939212, now seen corresponding path program 50 times [2020-07-21 16:05:11,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:11,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057998606] [2020-07-21 16:05:11,936 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:13,082 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:05:13,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:13,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 1697 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:05:13,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:13,873 INFO L134 CoverageAnalysis]: Checked inductivity of 39941 backedges. 20645 proven. 1995 refuted. 0 times theorem prover too weak. 17301 trivial. 0 not checked. [2020-07-21 16:05:13,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:25,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:26,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:26,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:27,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:27,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:27,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:27,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:28,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:28,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:28,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:28,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:31,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:31,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:32,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:33,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:33,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:33,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:33,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:33,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:33,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:34,381 INFO L134 CoverageAnalysis]: Checked inductivity of 39941 backedges. 1605 proven. 4518 refuted. 0 times theorem prover too weak. 33818 trivial. 0 not checked. [2020-07-21 16:05:34,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057998606] [2020-07-21 16:05:34,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:34,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-21 16:05:34,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317419120] [2020-07-21 16:05:34,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:05:34,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:34,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:05:34,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:05:34,384 INFO L87 Difference]: Start difference. First operand 546 states and 1071 transitions. Second operand 33 states. [2020-07-21 16:05:38,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:38,838 INFO L93 Difference]: Finished difference Result 1419 states and 3187 transitions. [2020-07-21 16:05:38,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 16:05:38,840 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 1147 [2020-07-21 16:05:38,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:38,849 INFO L225 Difference]: With dead ends: 1419 [2020-07-21 16:05:38,849 INFO L226 Difference]: Without dead ends: 837 [2020-07-21 16:05:38,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2325 GetRequests, 2235 SyntacticMatches, 27 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 927 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=626, Invalid=3534, Unknown=0, NotChecked=0, Total=4160 [2020-07-21 16:05:38,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 837 states. [2020-07-21 16:05:38,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 837 to 614. [2020-07-21 16:05:38,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 614 states. [2020-07-21 16:05:38,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 614 states to 614 states and 1306 transitions. [2020-07-21 16:05:38,904 INFO L78 Accepts]: Start accepts. Automaton has 614 states and 1306 transitions. Word has length 1147 [2020-07-21 16:05:38,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:38,904 INFO L479 AbstractCegarLoop]: Abstraction has 614 states and 1306 transitions. [2020-07-21 16:05:38,904 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:05:38,904 INFO L276 IsEmpty]: Start isEmpty. Operand 614 states and 1306 transitions. [2020-07-21 16:05:38,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1248 [2020-07-21 16:05:38,917 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:38,917 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 87, 87, 65, 65, 49, 49, 49, 49, 49, 49, 49, 43, 43, 43, 43, 43, 43, 43, 33, 22, 22, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:39,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:39,118 INFO L427 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:39,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:39,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1102870047, now seen corresponding path program 51 times [2020-07-21 16:05:39,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:39,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [292344008] [2020-07-21 16:05:39,120 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:40,290 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:05:40,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:40,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 1849 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 16:05:40,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:41,496 INFO L134 CoverageAnalysis]: Checked inductivity of 46452 backedges. 2616 proven. 4693 refuted. 0 times theorem prover too weak. 39143 trivial. 0 not checked. [2020-07-21 16:05:41,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:51,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:51,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:53,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:53,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:55,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:55,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:55,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:56,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:56,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:57,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:57,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:02,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:04,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:05,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:05,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:05,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:05,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:05,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:05,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:06,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:07,255 INFO L134 CoverageAnalysis]: Checked inductivity of 46452 backedges. 2624 proven. 4742 refuted. 0 times theorem prover too weak. 39086 trivial. 0 not checked. [2020-07-21 16:06:07,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [292344008] [2020-07-21 16:06:07,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:06:07,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 33] total 39 [2020-07-21 16:06:07,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133385426] [2020-07-21 16:06:07,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-21 16:06:07,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:06:07,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-21 16:06:07,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1329, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 16:06:07,258 INFO L87 Difference]: Start difference. First operand 614 states and 1306 transitions. Second operand 39 states. [2020-07-21 16:06:14,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:06:14,100 INFO L93 Difference]: Finished difference Result 1656 states and 4357 transitions. [2020-07-21 16:06:14,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-07-21 16:06:14,104 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 1247 [2020-07-21 16:06:14,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:06:14,123 INFO L225 Difference]: With dead ends: 1656 [2020-07-21 16:06:14,123 INFO L226 Difference]: Without dead ends: 1042 [2020-07-21 16:06:14,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2532 GetRequests, 2427 SyntacticMatches, 29 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=848, Invalid=5158, Unknown=0, NotChecked=0, Total=6006 [2020-07-21 16:06:14,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1042 states. [2020-07-21 16:06:14,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1042 to 869. [2020-07-21 16:06:14,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 869 states. [2020-07-21 16:06:14,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 869 states to 869 states and 2417 transitions. [2020-07-21 16:06:14,193 INFO L78 Accepts]: Start accepts. Automaton has 869 states and 2417 transitions. Word has length 1247 [2020-07-21 16:06:14,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:06:14,194 INFO L479 AbstractCegarLoop]: Abstraction has 869 states and 2417 transitions. [2020-07-21 16:06:14,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-21 16:06:14,194 INFO L276 IsEmpty]: Start isEmpty. Operand 869 states and 2417 transitions. [2020-07-21 16:06:14,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1039 [2020-07-21 16:06:14,215 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:06:14,215 INFO L422 BasicCegarLoop]: trace histogram [83, 83, 72, 72, 51, 50, 41, 41, 41, 41, 41, 41, 41, 36, 36, 36, 36, 36, 36, 36, 32, 22, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:06:14,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:14,417 INFO L427 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:06:14,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:06:14,418 INFO L82 PathProgramCache]: Analyzing trace with hash -256272208, now seen corresponding path program 52 times [2020-07-21 16:06:14,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:06:14,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080626388] [2020-07-21 16:06:14,419 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:15,767 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:06:15,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:06:15,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 1535 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:06:15,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:06:16,621 INFO L134 CoverageAnalysis]: Checked inductivity of 32136 backedges. 16096 proven. 1650 refuted. 0 times theorem prover too weak. 14390 trivial. 0 not checked. [2020-07-21 16:06:16,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:06:28,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:28,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:30,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:30,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:30,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:31,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:31,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:31,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:31,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:31,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:32,867 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 16:06:34,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:35,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:36,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:36,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:36,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:36,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:37,322 INFO L134 CoverageAnalysis]: Checked inductivity of 32136 backedges. 1675 proven. 3480 refuted. 0 times theorem prover too weak. 26981 trivial. 0 not checked. [2020-07-21 16:06:37,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080626388] [2020-07-21 16:06:37,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:06:37,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 16:06:37,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718903772] [2020-07-21 16:06:37,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:06:37,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:06:37,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:06:37,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:06:37,325 INFO L87 Difference]: Start difference. First operand 869 states and 2417 transitions. Second operand 31 states. [2020-07-21 16:06:41,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:06:41,978 INFO L93 Difference]: Finished difference Result 2298 states and 7870 transitions. [2020-07-21 16:06:41,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 16:06:41,982 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 1038 [2020-07-21 16:06:41,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:06:42,012 INFO L225 Difference]: With dead ends: 2298 [2020-07-21 16:06:42,012 INFO L226 Difference]: Without dead ends: 1378 [2020-07-21 16:06:42,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2105 GetRequests, 2021 SyntacticMatches, 25 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 794 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=570, Invalid=3090, Unknown=0, NotChecked=0, Total=3660 [2020-07-21 16:06:42,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1378 states. [2020-07-21 16:06:42,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1378 to 872. [2020-07-21 16:06:42,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 872 states. [2020-07-21 16:06:42,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 872 states to 872 states and 2425 transitions. [2020-07-21 16:06:42,153 INFO L78 Accepts]: Start accepts. Automaton has 872 states and 2425 transitions. Word has length 1038 [2020-07-21 16:06:42,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:06:42,153 INFO L479 AbstractCegarLoop]: Abstraction has 872 states and 2425 transitions. [2020-07-21 16:06:42,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:06:42,153 INFO L276 IsEmpty]: Start isEmpty. Operand 872 states and 2425 transitions. [2020-07-21 16:06:42,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1276 [2020-07-21 16:06:42,179 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:06:42,180 INFO L422 BasicCegarLoop]: trace histogram [103, 103, 88, 88, 62, 60, 51, 51, 51, 51, 51, 51, 51, 44, 44, 44, 44, 44, 44, 44, 41, 28, 18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:06:42,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:42,394 INFO L427 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:06:42,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:06:42,396 INFO L82 PathProgramCache]: Analyzing trace with hash -959346560, now seen corresponding path program 53 times [2020-07-21 16:06:42,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:06:42,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [404626100] [2020-07-21 16:06:42,397 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:43,727 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:06:43,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:06:43,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 1881 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:06:43,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:06:44,111 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 3 [2020-07-21 16:06:44,861 INFO L134 CoverageAnalysis]: Checked inductivity of 48869 backedges. 25563 proven. 1633 refuted. 0 times theorem prover too weak. 21673 trivial. 0 not checked. [2020-07-21 16:06:44,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:06:59,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:00,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:00,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:00,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:01,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:01,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:05,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:05,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:06,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:06,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:06,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:06,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:06,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:06,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:06,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:07,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:08,960 INFO L134 CoverageAnalysis]: Checked inductivity of 48869 backedges. 1721 proven. 4185 refuted. 0 times theorem prover too weak. 42963 trivial. 0 not checked. [2020-07-21 16:07:08,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [404626100] [2020-07-21 16:07:08,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:08,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 16:07:08,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790280469] [2020-07-21 16:07:08,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:07:08,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:08,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:07:08,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:07:08,962 INFO L87 Difference]: Start difference. First operand 872 states and 2425 transitions. Second operand 29 states. [2020-07-21 16:07:11,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:11,941 INFO L93 Difference]: Finished difference Result 2231 states and 6718 transitions. [2020-07-21 16:07:11,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 16:07:11,944 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 1275 [2020-07-21 16:07:11,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:11,965 INFO L225 Difference]: With dead ends: 2231 [2020-07-21 16:07:11,965 INFO L226 Difference]: Without dead ends: 1167 [2020-07-21 16:07:11,973 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2575 GetRequests, 2499 SyntacticMatches, 23 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=476, Invalid=2494, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 16:07:11,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1167 states. [2020-07-21 16:07:12,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1167 to 852. [2020-07-21 16:07:12,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 852 states. [2020-07-21 16:07:12,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 852 states to 852 states and 2351 transitions. [2020-07-21 16:07:12,096 INFO L78 Accepts]: Start accepts. Automaton has 852 states and 2351 transitions. Word has length 1275 [2020-07-21 16:07:12,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:12,097 INFO L479 AbstractCegarLoop]: Abstraction has 852 states and 2351 transitions. [2020-07-21 16:07:12,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:07:12,097 INFO L276 IsEmpty]: Start isEmpty. Operand 852 states and 2351 transitions. [2020-07-21 16:07:12,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1232 [2020-07-21 16:07:12,120 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:12,120 INFO L422 BasicCegarLoop]: trace histogram [99, 99, 86, 86, 58, 56, 49, 49, 49, 49, 49, 49, 49, 43, 43, 43, 43, 43, 43, 43, 41, 30, 15, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:12,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:12,336 INFO L427 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:12,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:12,337 INFO L82 PathProgramCache]: Analyzing trace with hash 1805876129, now seen corresponding path program 54 times [2020-07-21 16:07:12,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:12,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587877416] [2020-07-21 16:07:12,338 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:13,703 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:07:13,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:13,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 1809 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:07:13,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:14,794 INFO L134 CoverageAnalysis]: Checked inductivity of 45533 backedges. 22875 proven. 1511 refuted. 0 times theorem prover too weak. 21147 trivial. 0 not checked. [2020-07-21 16:07:14,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:29,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:29,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:29,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:30,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:30,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:30,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:30,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:34,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:35,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:35,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:35,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:35,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:35,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:36,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:38,894 INFO L134 CoverageAnalysis]: Checked inductivity of 45533 backedges. 1797 proven. 3449 refuted. 0 times theorem prover too weak. 40287 trivial. 0 not checked. [2020-07-21 16:07:38,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587877416] [2020-07-21 16:07:38,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:38,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 16:07:38,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724420368] [2020-07-21 16:07:38,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:07:38,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:38,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:07:38,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:07:38,897 INFO L87 Difference]: Start difference. First operand 852 states and 2351 transitions. Second operand 27 states. [2020-07-21 16:07:42,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:42,434 INFO L93 Difference]: Finished difference Result 2235 states and 7251 transitions. [2020-07-21 16:07:42,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-21 16:07:42,438 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 1231 [2020-07-21 16:07:42,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:42,472 INFO L225 Difference]: With dead ends: 2235 [2020-07-21 16:07:42,472 INFO L226 Difference]: Without dead ends: 1321 [2020-07-21 16:07:42,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2485 GetRequests, 2415 SyntacticMatches, 21 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 484 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=418, Invalid=2132, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 16:07:42,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1321 states. [2020-07-21 16:07:42,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1321 to 858. [2020-07-21 16:07:42,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 858 states. [2020-07-21 16:07:42,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 858 states to 858 states and 2401 transitions. [2020-07-21 16:07:42,668 INFO L78 Accepts]: Start accepts. Automaton has 858 states and 2401 transitions. Word has length 1231 [2020-07-21 16:07:42,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:42,669 INFO L479 AbstractCegarLoop]: Abstraction has 858 states and 2401 transitions. [2020-07-21 16:07:42,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:07:42,669 INFO L276 IsEmpty]: Start isEmpty. Operand 858 states and 2401 transitions. [2020-07-21 16:07:42,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 942 [2020-07-21 16:07:42,691 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:42,692 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 65, 65, 45, 43, 38, 38, 38, 38, 38, 38, 38, 33, 32, 32, 32, 32, 32, 32, 32, 20, 11, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:42,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:42,905 INFO L427 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:42,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:42,906 INFO L82 PathProgramCache]: Analyzing trace with hash 361878647, now seen corresponding path program 55 times [2020-07-21 16:07:42,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:42,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [625715732] [2020-07-21 16:07:42,907 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:44,244 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:07:44,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:44,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 1389 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:07:44,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:45,180 INFO L134 CoverageAnalysis]: Checked inductivity of 26409 backedges. 10965 proven. 1635 refuted. 0 times theorem prover too weak. 13809 trivial. 0 not checked. [2020-07-21 16:07:45,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:58,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:59,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:59,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:00,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:00,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:01,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:01,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:01,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:01,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:01,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:01,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:05,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:06,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:06,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:06,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:06,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:06,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:06,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:07,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:08,667 INFO L134 CoverageAnalysis]: Checked inductivity of 26409 backedges. 1869 proven. 2702 refuted. 0 times theorem prover too weak. 21838 trivial. 0 not checked. [2020-07-21 16:08:08,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [625715732] [2020-07-21 16:08:08,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:08:08,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 16:08:08,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339248744] [2020-07-21 16:08:08,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:08:08,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:08:08,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:08:08,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:08:08,670 INFO L87 Difference]: Start difference. First operand 858 states and 2401 transitions. Second operand 31 states. [2020-07-21 16:08:14,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:08:14,261 INFO L93 Difference]: Finished difference Result 2201 states and 7106 transitions. [2020-07-21 16:08:14,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 16:08:14,266 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 941 [2020-07-21 16:08:14,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:08:14,297 INFO L225 Difference]: With dead ends: 2201 [2020-07-21 16:08:14,297 INFO L226 Difference]: Without dead ends: 1294 [2020-07-21 16:08:14,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1914 GetRequests, 1827 SyntacticMatches, 25 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 901 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=620, Invalid=3412, Unknown=0, NotChecked=0, Total=4032 [2020-07-21 16:08:14,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1294 states. [2020-07-21 16:08:14,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1294 to 855. [2020-07-21 16:08:14,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 855 states. [2020-07-21 16:08:14,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 855 states to 855 states and 2375 transitions. [2020-07-21 16:08:14,511 INFO L78 Accepts]: Start accepts. Automaton has 855 states and 2375 transitions. Word has length 941 [2020-07-21 16:08:14,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:08:14,512 INFO L479 AbstractCegarLoop]: Abstraction has 855 states and 2375 transitions. [2020-07-21 16:08:14,512 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:08:14,512 INFO L276 IsEmpty]: Start isEmpty. Operand 855 states and 2375 transitions. [2020-07-21 16:08:14,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1232 [2020-07-21 16:08:14,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:08:14,542 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 90, 90, 58, 56, 47, 47, 47, 47, 47, 47, 47, 45, 45, 45, 45, 45, 45, 45, 37, 34, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:08:14,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:14,758 INFO L427 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:08:14,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:08:14,759 INFO L82 PathProgramCache]: Analyzing trace with hash 703983561, now seen corresponding path program 56 times [2020-07-21 16:08:14,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:08:14,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [224232832] [2020-07-21 16:08:14,760 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:16,197 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:08:16,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:08:16,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 1815 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:08:16,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:08:17,466 INFO L134 CoverageAnalysis]: Checked inductivity of 45357 backedges. 23651 proven. 1700 refuted. 0 times theorem prover too weak. 20006 trivial. 0 not checked. [2020-07-21 16:08:17,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:08:37,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:37,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:38,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:39,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:39,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:40,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:40,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:41,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:41,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:44,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:45,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:46,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:46,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:46,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:46,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:46,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:47,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:49,703 INFO L134 CoverageAnalysis]: Checked inductivity of 45357 backedges. 2266 proven. 4348 refuted. 0 times theorem prover too weak. 38743 trivial. 0 not checked. [2020-07-21 16:08:49,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [224232832] [2020-07-21 16:08:49,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:08:49,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-21 16:08:49,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336985318] [2020-07-21 16:08:49,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:08:49,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:08:49,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:08:49,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:08:49,706 INFO L87 Difference]: Start difference. First operand 855 states and 2375 transitions. Second operand 33 states. [2020-07-21 16:08:55,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:08:55,838 INFO L93 Difference]: Finished difference Result 2163 states and 6704 transitions. [2020-07-21 16:08:55,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-21 16:08:55,843 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 1231 [2020-07-21 16:08:55,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:08:55,867 INFO L225 Difference]: With dead ends: 2163 [2020-07-21 16:08:55,867 INFO L226 Difference]: Without dead ends: 1094 [2020-07-21 16:08:55,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2495 GetRequests, 2403 SyntacticMatches, 27 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 991 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=644, Invalid=3778, Unknown=0, NotChecked=0, Total=4422 [2020-07-21 16:08:55,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1094 states. [2020-07-21 16:08:56,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1094 to 883. [2020-07-21 16:08:56,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 883 states. [2020-07-21 16:08:56,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 883 states to 883 states and 2521 transitions. [2020-07-21 16:08:56,020 INFO L78 Accepts]: Start accepts. Automaton has 883 states and 2521 transitions. Word has length 1231 [2020-07-21 16:08:56,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:08:56,021 INFO L479 AbstractCegarLoop]: Abstraction has 883 states and 2521 transitions. [2020-07-21 16:08:56,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:08:56,021 INFO L276 IsEmpty]: Start isEmpty. Operand 883 states and 2521 transitions. [2020-07-21 16:08:56,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1038 [2020-07-21 16:08:56,045 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:08:56,045 INFO L422 BasicCegarLoop]: trace histogram [80, 80, 77, 77, 45, 43, 40, 40, 40, 40, 40, 40, 40, 38, 38, 38, 38, 38, 38, 38, 37, 32, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:08:56,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:56,259 INFO L427 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:08:56,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:08:56,260 INFO L82 PathProgramCache]: Analyzing trace with hash -546001051, now seen corresponding path program 57 times [2020-07-21 16:08:56,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:08:56,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523696505] [2020-07-21 16:08:56,261 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:57,698 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:08:57,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:08:57,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 1524 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 16:08:57,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:08:58,955 INFO L134 CoverageAnalysis]: Checked inductivity of 32169 backedges. 13384 proven. 2811 refuted. 0 times theorem prover too weak. 15974 trivial. 0 not checked. [2020-07-21 16:08:58,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:09:01,591 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:09:01,708 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:09:09,826 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:09:09,933 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:09:17,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:19,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:20,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:20,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:21,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:21,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:21,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:22,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:22,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:24,905 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:09:25,114 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:09:25,223 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:09:25,328 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:09:28,485 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-21 16:09:30,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:30,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:32,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:32,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:34,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:34,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:35,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:35,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:36,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:36,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:36,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:36,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:36,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:37,551 INFO L134 CoverageAnalysis]: Checked inductivity of 32169 backedges. 1815 proven. 4387 refuted. 0 times theorem prover too weak. 25967 trivial. 0 not checked. [2020-07-21 16:09:37,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523696505] [2020-07-21 16:09:37,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:09:37,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 33] total 37 [2020-07-21 16:09:37,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946159888] [2020-07-21 16:09:37,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 16:09:37,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:09:37,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 16:09:37,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1189, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:09:37,555 INFO L87 Difference]: Start difference. First operand 883 states and 2521 transitions. Second operand 37 states. [2020-07-21 16:09:44,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:09:44,624 INFO L93 Difference]: Finished difference Result 1862 states and 5671 transitions. [2020-07-21 16:09:44,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-21 16:09:44,630 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 1037 [2020-07-21 16:09:44,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:09:44,646 INFO L225 Difference]: With dead ends: 1862 [2020-07-21 16:09:44,646 INFO L226 Difference]: Without dead ends: 978 [2020-07-21 16:09:44,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2109 GetRequests, 2007 SyntacticMatches, 31 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1227 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=770, Invalid=4486, Unknown=0, NotChecked=0, Total=5256 [2020-07-21 16:09:44,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 978 states. [2020-07-21 16:09:44,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 978 to 568. [2020-07-21 16:09:44,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 568 states. [2020-07-21 16:09:44,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 568 states to 568 states and 1143 transitions. [2020-07-21 16:09:44,716 INFO L78 Accepts]: Start accepts. Automaton has 568 states and 1143 transitions. Word has length 1037 [2020-07-21 16:09:44,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:09:44,716 INFO L479 AbstractCegarLoop]: Abstraction has 568 states and 1143 transitions. [2020-07-21 16:09:44,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 16:09:44,716 INFO L276 IsEmpty]: Start isEmpty. Operand 568 states and 1143 transitions. [2020-07-21 16:09:44,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 749 [2020-07-21 16:09:44,724 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:09:44,724 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 51, 51, 38, 37, 30, 30, 30, 30, 30, 30, 30, 25, 25, 25, 25, 25, 25, 25, 23, 13, 12, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:09:44,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:09:44,926 INFO L427 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:09:44,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:09:44,927 INFO L82 PathProgramCache]: Analyzing trace with hash -462998976, now seen corresponding path program 58 times [2020-07-21 16:09:44,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:09:44,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12096399] [2020-07-21 16:09:44,928 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:09:46,492 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:09:46,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:09:46,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 1109 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 16:09:46,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:09:47,447 INFO L134 CoverageAnalysis]: Checked inductivity of 16489 backedges. 1831 proven. 2058 refuted. 0 times theorem prover too weak. 12600 trivial. 0 not checked. [2020-07-21 16:09:47,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:09:56,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:58,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:58,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:58,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:59,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:59,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:59,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:59,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:00,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:00,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:07,491 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:10:08,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:08,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:10,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:10,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:12,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:12,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:13,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:13,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:14,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:14,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:14,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:14,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:15,216 INFO L134 CoverageAnalysis]: Checked inductivity of 16489 backedges. 1835 proven. 2099 refuted. 0 times theorem prover too weak. 12555 trivial. 0 not checked. [2020-07-21 16:10:15,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12096399] [2020-07-21 16:10:15,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:15,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31] total 35 [2020-07-21 16:10:15,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712377916] [2020-07-21 16:10:15,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:10:15,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:15,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:10:15,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1056, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:10:15,218 INFO L87 Difference]: Start difference. First operand 568 states and 1143 transitions. Second operand 35 states. [2020-07-21 16:10:21,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:21,531 INFO L93 Difference]: Finished difference Result 1196 states and 2468 transitions. [2020-07-21 16:10:21,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 16:10:21,538 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 748 [2020-07-21 16:10:21,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:21,546 INFO L225 Difference]: With dead ends: 1196 [2020-07-21 16:10:21,546 INFO L226 Difference]: Without dead ends: 622 [2020-07-21 16:10:21,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1522 GetRequests, 1433 SyntacticMatches, 29 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=560, Invalid=3222, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 16:10:21,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 622 states. [2020-07-21 16:10:21,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 622 to 573. [2020-07-21 16:10:21,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 573 states. [2020-07-21 16:10:21,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 573 states to 573 states and 1076 transitions. [2020-07-21 16:10:21,607 INFO L78 Accepts]: Start accepts. Automaton has 573 states and 1076 transitions. Word has length 748 [2020-07-21 16:10:21,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:21,608 INFO L479 AbstractCegarLoop]: Abstraction has 573 states and 1076 transitions. [2020-07-21 16:10:21,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:10:21,608 INFO L276 IsEmpty]: Start isEmpty. Operand 573 states and 1076 transitions. [2020-07-21 16:10:21,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 870 [2020-07-21 16:10:21,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:21,625 INFO L422 BasicCegarLoop]: trace histogram [70, 70, 59, 59, 44, 44, 35, 35, 35, 35, 35, 35, 35, 29, 29, 29, 29, 29, 29, 29, 26, 15, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:10:21,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:21,840 INFO L427 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:21,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:21,841 INFO L82 PathProgramCache]: Analyzing trace with hash 2143930501, now seen corresponding path program 59 times [2020-07-21 16:10:21,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:21,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1436384132] [2020-07-21 16:10:21,842 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:23,434 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:10:23,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:23,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 1934 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:10:23,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:24,055 INFO L134 CoverageAnalysis]: Checked inductivity of 22400 backedges. 448 proven. 2183 refuted. 0 times theorem prover too weak. 19769 trivial. 0 not checked. [2020-07-21 16:10:24,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:26,991 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:27,097 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:28,046 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:10:28,157 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:10:28,277 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:28,392 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:28,506 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:10:28,611 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 16:10:32,850 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 16:10:35,835 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:35,942 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:36,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:41,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:44,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:46,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:46,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:46,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:47,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:47,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:47,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:47,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:48,007 INFO L134 CoverageAnalysis]: Checked inductivity of 22400 backedges. 448 proven. 2216 refuted. 0 times theorem prover too weak. 19736 trivial. 0 not checked. [2020-07-21 16:10:48,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1436384132] [2020-07-21 16:10:48,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:48,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:10:48,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950145034] [2020-07-21 16:10:48,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:10:48,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:48,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:10:48,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:10:48,010 INFO L87 Difference]: Start difference. First operand 573 states and 1076 transitions. Second operand 22 states. [2020-07-21 16:10:49,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:49,339 INFO L93 Difference]: Finished difference Result 723 states and 1510 transitions. [2020-07-21 16:10:49,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:10:49,346 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 869 [2020-07-21 16:10:49,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:49,355 INFO L225 Difference]: With dead ends: 723 [2020-07-21 16:10:49,355 INFO L226 Difference]: Without dead ends: 719 [2020-07-21 16:10:49,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1745 GetRequests, 1701 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:10:49,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 719 states. [2020-07-21 16:10:49,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 719 to 607. [2020-07-21 16:10:49,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 607 states. [2020-07-21 16:10:49,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 1170 transitions. [2020-07-21 16:10:49,392 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 1170 transitions. Word has length 869 [2020-07-21 16:10:49,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:49,393 INFO L479 AbstractCegarLoop]: Abstraction has 607 states and 1170 transitions. [2020-07-21 16:10:49,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:10:49,393 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 1170 transitions. [2020-07-21 16:10:49,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 858 [2020-07-21 16:10:49,403 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:49,403 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 62, 62, 44, 44, 32, 32, 32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 31, 21, 18, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:10:49,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:49,604 INFO L427 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:49,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:49,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1712530370, now seen corresponding path program 60 times [2020-07-21 16:10:49,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:49,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1497979951] [2020-07-21 16:10:49,607 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:51,215 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:10:51,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:51,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 1907 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:10:51,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:51,984 INFO L134 CoverageAnalysis]: Checked inductivity of 21620 backedges. 483 proven. 2096 refuted. 0 times theorem prover too weak. 19041 trivial. 0 not checked. [2020-07-21 16:10:51,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:54,948 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:55,055 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:56,069 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:10:56,186 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:10:56,310 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:56,437 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:56,555 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:10:56,662 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 16:11:04,489 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:04,699 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:04,807 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:05,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:05,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:09,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:12,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:12,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:14,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:15,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:16,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:16,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:16,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:17,279 INFO L134 CoverageAnalysis]: Checked inductivity of 21620 backedges. 483 proven. 2129 refuted. 0 times theorem prover too weak. 19008 trivial. 0 not checked. [2020-07-21 16:11:17,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1497979951] [2020-07-21 16:11:17,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:11:17,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:11:17,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803401089] [2020-07-21 16:11:17,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:11:17,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:11:17,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:11:17,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:11:17,281 INFO L87 Difference]: Start difference. First operand 607 states and 1170 transitions. Second operand 22 states. [2020-07-21 16:11:18,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:11:18,536 INFO L93 Difference]: Finished difference Result 776 states and 1648 transitions. [2020-07-21 16:11:18,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:11:18,543 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 857 [2020-07-21 16:11:18,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:11:18,552 INFO L225 Difference]: With dead ends: 776 [2020-07-21 16:11:18,552 INFO L226 Difference]: Without dead ends: 772 [2020-07-21 16:11:18,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1721 GetRequests, 1677 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:11:18,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 772 states. [2020-07-21 16:11:18,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 772 to 607. [2020-07-21 16:11:18,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 607 states. [2020-07-21 16:11:18,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 607 states to 607 states and 1170 transitions. [2020-07-21 16:11:18,609 INFO L78 Accepts]: Start accepts. Automaton has 607 states and 1170 transitions. Word has length 857 [2020-07-21 16:11:18,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:11:18,610 INFO L479 AbstractCegarLoop]: Abstraction has 607 states and 1170 transitions. [2020-07-21 16:11:18,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:11:18,610 INFO L276 IsEmpty]: Start isEmpty. Operand 607 states and 1170 transitions. [2020-07-21 16:11:18,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 834 [2020-07-21 16:11:18,621 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:11:18,622 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 58, 58, 44, 44, 32, 32, 32, 32, 32, 32, 32, 29, 29, 29, 29, 29, 29, 29, 21, 15, 14, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:11:18,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:18,836 INFO L427 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:11:18,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:11:18,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1456879404, now seen corresponding path program 61 times [2020-07-21 16:11:18,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:11:18,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [287862833] [2020-07-21 16:11:18,838 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:20,404 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:11:20,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:11:20,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 1853 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:11:20,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:11:20,892 INFO L134 CoverageAnalysis]: Checked inductivity of 20432 backedges. 525 proven. 1681 refuted. 0 times theorem prover too weak. 18226 trivial. 0 not checked. [2020-07-21 16:11:20,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:11:23,577 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:24,730 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:24,841 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:11:24,950 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:11:25,055 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:11:32,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:32,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:36,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:39,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:39,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:41,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:41,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:41,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:41,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:41,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:41,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:42,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:42,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:43,664 INFO L134 CoverageAnalysis]: Checked inductivity of 20432 backedges. 525 proven. 1705 refuted. 0 times theorem prover too weak. 18202 trivial. 0 not checked. [2020-07-21 16:11:43,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [287862833] [2020-07-21 16:11:43,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:11:43,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:11:43,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945318691] [2020-07-21 16:11:43,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:11:43,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:11:43,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:11:43,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:11:43,667 INFO L87 Difference]: Start difference. First operand 607 states and 1170 transitions. Second operand 20 states. [2020-07-21 16:11:44,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:11:44,823 INFO L93 Difference]: Finished difference Result 758 states and 1586 transitions. [2020-07-21 16:11:44,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:11:44,830 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 833 [2020-07-21 16:11:44,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:11:44,839 INFO L225 Difference]: With dead ends: 758 [2020-07-21 16:11:44,839 INFO L226 Difference]: Without dead ends: 754 [2020-07-21 16:11:44,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1672 GetRequests, 1633 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:11:44,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 754 states. [2020-07-21 16:11:44,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 754 to 610. [2020-07-21 16:11:44,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 610 states. [2020-07-21 16:11:44,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 610 states to 610 states and 1175 transitions. [2020-07-21 16:11:44,877 INFO L78 Accepts]: Start accepts. Automaton has 610 states and 1175 transitions. Word has length 833 [2020-07-21 16:11:44,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:11:44,878 INFO L479 AbstractCegarLoop]: Abstraction has 610 states and 1175 transitions. [2020-07-21 16:11:44,878 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:11:44,878 INFO L276 IsEmpty]: Start isEmpty. Operand 610 states and 1175 transitions. [2020-07-21 16:11:44,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1014 [2020-07-21 16:11:44,893 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:11:44,894 INFO L422 BasicCegarLoop]: trace histogram [79, 79, 74, 74, 44, 44, 39, 39, 39, 39, 39, 39, 39, 37, 37, 37, 37, 37, 37, 37, 35, 30, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:11:45,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:45,108 INFO L427 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:11:45,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:11:45,109 INFO L82 PathProgramCache]: Analyzing trace with hash 2127374679, now seen corresponding path program 62 times [2020-07-21 16:11:45,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:11:45,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83116470] [2020-07-21 16:11:45,110 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:46,815 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:11:46,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:11:46,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 2258 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:11:46,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:11:47,690 INFO L134 CoverageAnalysis]: Checked inductivity of 30648 backedges. 618 proven. 2453 refuted. 0 times theorem prover too weak. 27577 trivial. 0 not checked. [2020-07-21 16:11:47,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:11:50,394 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:50,497 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:50,608 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:50,718 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:51,968 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:11:52,088 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:11:52,214 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:52,339 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:52,459 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:11:52,571 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 16:11:52,679 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:12:01,717 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:01,822 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:01,936 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:12:02,047 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:12:02,155 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:12:02,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:08,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:12,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:12,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:14,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:14,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:14,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:14,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:15,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:15,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:15,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:15,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:16,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:17,267 INFO L134 CoverageAnalysis]: Checked inductivity of 30648 backedges. 620 proven. 2484 refuted. 0 times theorem prover too weak. 27544 trivial. 0 not checked. [2020-07-21 16:12:17,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83116470] [2020-07-21 16:12:17,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:12:17,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:12:17,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157467541] [2020-07-21 16:12:17,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:12:17,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:12:17,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:12:17,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:12:17,269 INFO L87 Difference]: Start difference. First operand 610 states and 1175 transitions. Second operand 22 states. [2020-07-21 16:12:18,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:12:18,812 INFO L93 Difference]: Finished difference Result 696 states and 1329 transitions. [2020-07-21 16:12:18,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:12:18,819 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1013 [2020-07-21 16:12:18,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:12:18,826 INFO L225 Difference]: With dead ends: 696 [2020-07-21 16:12:18,827 INFO L226 Difference]: Without dead ends: 692 [2020-07-21 16:12:18,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2033 GetRequests, 1989 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:12:18,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 692 states. [2020-07-21 16:12:18,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 692 to 605. [2020-07-21 16:12:18,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 605 states. [2020-07-21 16:12:18,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 605 states to 605 states and 1132 transitions. [2020-07-21 16:12:18,861 INFO L78 Accepts]: Start accepts. Automaton has 605 states and 1132 transitions. Word has length 1013 [2020-07-21 16:12:18,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:12:18,862 INFO L479 AbstractCegarLoop]: Abstraction has 605 states and 1132 transitions. [2020-07-21 16:12:18,862 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:12:18,862 INFO L276 IsEmpty]: Start isEmpty. Operand 605 states and 1132 transitions. [2020-07-21 16:12:18,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 906 [2020-07-21 16:12:18,871 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:12:18,871 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 67, 67, 44, 44, 34, 34, 34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 33, 24, 23, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:12:19,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:12:19,073 INFO L427 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:12:19,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:12:19,074 INFO L82 PathProgramCache]: Analyzing trace with hash -1571524466, now seen corresponding path program 63 times [2020-07-21 16:12:19,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:12:19,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [672816696] [2020-07-21 16:12:19,075 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:12:20,774 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:12:20,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:12:20,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 2015 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:12:20,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:12:21,396 INFO L134 CoverageAnalysis]: Checked inductivity of 24204 backedges. 677 proven. 1713 refuted. 0 times theorem prover too weak. 21814 trivial. 0 not checked. [2020-07-21 16:12:21,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:12:25,553 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:25,658 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:25,771 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:12:25,885 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:12:25,993 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:12:34,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:39,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:42,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:42,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:42,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:43,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:43,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:44,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:44,411 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 16:12:44,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:46,779 INFO L134 CoverageAnalysis]: Checked inductivity of 24204 backedges. 677 proven. 1739 refuted. 0 times theorem prover too weak. 21788 trivial. 0 not checked. [2020-07-21 16:12:46,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [672816696] [2020-07-21 16:12:46,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:12:46,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:12:46,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229296466] [2020-07-21 16:12:46,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:12:46,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:12:46,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:12:46,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:12:46,781 INFO L87 Difference]: Start difference. First operand 605 states and 1132 transitions. Second operand 20 states. [2020-07-21 16:12:48,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:12:48,380 INFO L93 Difference]: Finished difference Result 726 states and 1436 transitions. [2020-07-21 16:12:48,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:12:48,389 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 905 [2020-07-21 16:12:48,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:12:48,403 INFO L225 Difference]: With dead ends: 726 [2020-07-21 16:12:48,403 INFO L226 Difference]: Without dead ends: 722 [2020-07-21 16:12:48,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1816 GetRequests, 1777 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:12:48,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2020-07-21 16:12:48,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 605. [2020-07-21 16:12:48,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 605 states. [2020-07-21 16:12:48,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 605 states to 605 states and 1132 transitions. [2020-07-21 16:12:48,488 INFO L78 Accepts]: Start accepts. Automaton has 605 states and 1132 transitions. Word has length 905 [2020-07-21 16:12:48,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:12:48,489 INFO L479 AbstractCegarLoop]: Abstraction has 605 states and 1132 transitions. [2020-07-21 16:12:48,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:12:48,490 INFO L276 IsEmpty]: Start isEmpty. Operand 605 states and 1132 transitions. [2020-07-21 16:12:48,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 954 [2020-07-21 16:12:48,513 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:12:48,514 INFO L422 BasicCegarLoop]: trace histogram [78, 78, 65, 65, 44, 44, 39, 39, 39, 39, 39, 39, 39, 34, 32, 32, 32, 32, 32, 32, 32, 21, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:12:48,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:12:48,727 INFO L427 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:12:48,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:12:48,728 INFO L82 PathProgramCache]: Analyzing trace with hash -1554171508, now seen corresponding path program 64 times [2020-07-21 16:12:48,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:12:48,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547995095] [2020-07-21 16:12:48,729 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:12:51,314 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:12:51,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:12:51,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 2123 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:12:51,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:12:52,708 INFO L134 CoverageAnalysis]: Checked inductivity of 27172 backedges. 972 proven. 1927 refuted. 0 times theorem prover too weak. 24273 trivial. 0 not checked. [2020-07-21 16:12:52,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:12:55,745 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40