/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_8-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:55:28,284 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:55:28,288 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:55:28,307 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:55:28,307 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:55:28,309 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:55:28,312 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:55:28,315 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:55:28,318 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:55:28,320 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:55:28,322 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:55:28,324 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:55:28,325 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:55:28,326 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:55:28,329 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:55:28,331 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:55:28,333 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:55:28,335 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:55:28,337 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:55:28,340 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:55:28,343 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:55:28,345 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:55:28,347 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:55:28,349 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:55:28,353 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:55:28,366 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:55:28,368 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:55:28,369 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:55:28,371 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 [2020-07-20 16:55:28,392 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:55:28,392 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:55:28,395 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:55:28,395 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:55:28,395 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:55:28,396 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:55:28,396 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:55:28,396 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:55:28,398 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:55:28,398 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:55:28,399 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:55:28,399 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:55:28,399 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:55:28,399 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:55:28,400 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:55:28,400 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:55:28,400 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:55:28,400 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:55:28,401 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:55:28,401 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:55:28,401 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:55:28,401 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:55:28,402 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:55:28,402 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:55:28,402 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:55:28,403 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:55:28,403 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:28,403 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:55:28,403 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:55:28,404 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 -> 4 [2020-07-20 16:55:28,866 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:55:28,899 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:55:28,906 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:55:28,910 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:55:28,911 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:55:28,912 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_8-1.c [2020-07-20 16:55:29,073 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e57468fe2/8b6901b37d5542eca0782eb38695c55a/FLAG6244ed781 [2020-07-20 16:55:29,973 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:55:29,974 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_8-1.c [2020-07-20 16:55:29,995 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e57468fe2/8b6901b37d5542eca0782eb38695c55a/FLAG6244ed781 [2020-07-20 16:55:30,242 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e57468fe2/8b6901b37d5542eca0782eb38695c55a [2020-07-20 16:55:30,270 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:55:30,278 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:55:30,285 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:55:30,285 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:55:30,293 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:55:30,296 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:55:30" (1/1) ... [2020-07-20 16:55:30,303 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c291f74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:55:30, skipping insertion in model container [2020-07-20 16:55:30,304 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:55:30" (1/1) ... [2020-07-20 16:55:30,322 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:55:30,361 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:55:30,598 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:55:30,608 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:55:30,630 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:55:30,650 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:55:30,651 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:55:30 WrapperNode [2020-07-20 16:55:30,651 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:55:30,654 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:55:30,654 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:55:30,655 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:55:30,672 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:55:30" (1/1) ... [2020-07-20 16:55:30,673 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:55:30" (1/1) ... [2020-07-20 16:55:30,682 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:55:30" (1/1) ... [2020-07-20 16:55:30,683 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:55:30" (1/1) ... [2020-07-20 16:55:30,689 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:55:30" (1/1) ... [2020-07-20 16:55:30,693 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:55:30" (1/1) ... [2020-07-20 16:55:30,695 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:55:30" (1/1) ... [2020-07-20 16:55:30,699 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:55:30,700 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:55:30,701 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:55:30,701 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:55:30,703 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:55:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:55:30,966 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:55:30,966 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:55:30,967 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 16:55:30,967 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 16:55:30,968 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:55:30,970 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:55:30,970 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:55:30,970 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 16:55:30,972 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 16:55:30,972 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:55:30,974 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:55:30,974 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:55:31,294 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:55:31,295 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:55:31,303 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:55:31 BoogieIcfgContainer [2020-07-20 16:55:31,304 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:55:31,306 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:55:31,306 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:55:31,312 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:55:31,312 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:55:30" (1/3) ... [2020-07-20 16:55:31,314 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14b3a7dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:55:31, skipping insertion in model container [2020-07-20 16:55:31,314 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:55:30" (2/3) ... [2020-07-20 16:55:31,315 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14b3a7dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:55:31, skipping insertion in model container [2020-07-20 16:55:31,315 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:55:31" (3/3) ... [2020-07-20 16:55:31,319 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_8-1.c [2020-07-20 16:55:31,336 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:55:31,350 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:55:31,368 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:55:31,407 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:55:31,407 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:55:31,408 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:55:31,408 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:55:31,408 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:55:31,408 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:55:31,408 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:55:31,409 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:55:31,442 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 16:55:31,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:55:31,452 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:31,455 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:31,456 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:31,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:31,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 16:55:31,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:31,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1616852100] [2020-07-20 16:55:31,476 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:31,585 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:31,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:31,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:55:31,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:31,771 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:55:31,771 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:55:31,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1616852100] [2020-07-20 16:55:31,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:55:31,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:55:31,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079731697] [2020-07-20 16:55:31,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:55:31,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:31,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:55:31,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:55:31,817 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 16:55:32,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:32,129 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 16:55:32,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:55:32,133 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:55:32,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:32,152 INFO L225 Difference]: With dead ends: 44 [2020-07-20 16:55:32,153 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:55:32,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:55:32,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:55:32,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 16:55:32,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:55:32,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:55:32,237 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 16:55:32,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:32,237 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:55:32,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:55:32,238 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:55:32,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:55:32,241 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:32,242 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:32,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:32,444 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:32,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:32,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 16:55:32,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:32,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [839073204] [2020-07-20 16:55:32,449 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:32,484 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:32,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:32,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:55:32,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:32,571 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:55:32,572 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:55:32,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [839073204] [2020-07-20 16:55:32,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:55:32,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:55:32,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960956561] [2020-07-20 16:55:32,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:55:32,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:32,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:55:32,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:55:32,582 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 16:55:32,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:32,711 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 16:55:32,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:55:32,713 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:55:32,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:32,715 INFO L225 Difference]: With dead ends: 36 [2020-07-20 16:55:32,716 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 16:55:32,718 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 [2020-07-20 16:55:32,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 16:55:32,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 16:55:32,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:55:32,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:55:32,732 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 16:55:32,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:32,733 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:55:32,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:55:32,734 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:55:32,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:55:32,737 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:32,737 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] [2020-07-20 16:55:32,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:32,952 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:32,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:32,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 16:55:32,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:32,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [990657517] [2020-07-20 16:55:32,964 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:33,088 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:33,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:33,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:55:33,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:33,176 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:55:33,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:33,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:33,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:33,514 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:55:33,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [990657517] [2020-07-20 16:55:33,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:33,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:55:33,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815011199] [2020-07-20 16:55:33,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:55:33,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:33,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:55:33,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:55:33,520 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 16:55:33,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:33,769 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 16:55:33,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:55:33,771 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 16:55:33,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:33,774 INFO L225 Difference]: With dead ends: 41 [2020-07-20 16:55:33,774 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:55:33,776 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 [2020-07-20 16:55:33,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:55:33,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 16:55:33,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:55:33,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:55:33,791 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 16:55:33,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:33,792 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:55:33,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:55:33,792 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:55:33,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:55:33,796 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:33,796 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] [2020-07-20 16:55:34,010 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:34,011 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:34,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:34,013 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 16:55:34,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:34,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [922011935] [2020-07-20 16:55:34,015 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:34,073 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:34,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:34,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:55:34,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:34,129 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:55:34,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:34,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,351 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:55:34,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [922011935] [2020-07-20 16:55:34,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:34,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:55:34,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592965296] [2020-07-20 16:55:34,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:55:34,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:34,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:55:34,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:55:34,356 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 16:55:34,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:34,552 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 16:55:34,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:55:34,554 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 16:55:34,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:34,556 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:55:34,557 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:55:34,558 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 [2020-07-20 16:55:34,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:55:34,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 16:55:34,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:55:34,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:55:34,570 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 16:55:34,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:34,571 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:55:34,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:55:34,571 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:55:34,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:55:34,573 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:34,574 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] [2020-07-20 16:55:34,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:34,789 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:34,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:34,790 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 16:55:34,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:34,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [809093832] [2020-07-20 16:55:34,792 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:34,844 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:34,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:34,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:55:34,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:34,921 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:55:34,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:35,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:35,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:35,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:35,392 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:55:35,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [809093832] [2020-07-20 16:55:35,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:35,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:55:35,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873669385] [2020-07-20 16:55:35,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:55:35,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:35,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:55:35,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:55:35,396 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 16:55:35,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:35,638 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 16:55:35,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:55:35,639 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 16:55:35,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:35,641 INFO L225 Difference]: With dead ends: 51 [2020-07-20 16:55:35,642 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 16:55:35,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:55:35,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 16:55:35,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 16:55:35,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 16:55:35,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 16:55:35,656 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 16:55:35,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:35,657 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 16:55:35,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:55:35,657 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 16:55:35,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:55:35,660 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:35,660 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] [2020-07-20 16:55:35,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:35,871 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:35,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:35,872 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 16:55:35,873 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:35,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1694059690] [2020-07-20 16:55:35,874 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:35,922 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:35,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:35,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:55:35,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:36,038 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:55:36,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:36,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:36,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:36,440 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:55:36,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1694059690] [2020-07-20 16:55:36,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:36,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:55:36,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384368798] [2020-07-20 16:55:36,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:55:36,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:36,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:55:36,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:55:36,444 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 16:55:36,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:36,909 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-20 16:55:36,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:55:36,911 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 16:55:36,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:36,923 INFO L225 Difference]: With dead ends: 84 [2020-07-20 16:55:36,924 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 16:55:36,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:55:36,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 16:55:36,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-20 16:55:36,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 16:55:36,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-20 16:55:36,974 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-20 16:55:36,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:36,975 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-20 16:55:36,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:55:36,976 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-20 16:55:36,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:55:36,980 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:36,981 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] [2020-07-20 16:55:37,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:37,196 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:37,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:37,196 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-20 16:55:37,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:37,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1546003939] [2020-07-20 16:55:37,198 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:37,278 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:37,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:37,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:55:37,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:37,386 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:55:37,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:37,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:37,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:37,901 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:55:37,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1546003939] [2020-07-20 16:55:37,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:37,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:55:37,903 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765941788] [2020-07-20 16:55:37,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:55:37,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:37,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:55:37,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:55:37,906 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-20 16:55:38,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:38,188 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-20 16:55:38,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:55:38,189 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-20 16:55:38,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:38,193 INFO L225 Difference]: With dead ends: 63 [2020-07-20 16:55:38,194 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 16:55:38,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:55:38,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 16:55:38,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-20 16:55:38,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 16:55:38,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-20 16:55:38,219 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-20 16:55:38,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:38,219 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-20 16:55:38,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:55:38,220 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-20 16:55:38,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 16:55:38,223 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:38,224 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] [2020-07-20 16:55:38,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:38,439 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:38,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:38,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-20 16:55:38,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:38,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008934127] [2020-07-20 16:55:38,442 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:38,504 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:38,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:38,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:55:38,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:38,577 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:55:38,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:38,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:38,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:38,863 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:55:38,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008934127] [2020-07-20 16:55:38,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:38,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:55:38,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962294360] [2020-07-20 16:55:38,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:55:38,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:38,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:55:38,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:55:38,868 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-20 16:55:39,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:39,034 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-20 16:55:39,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:55:39,035 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-20 16:55:39,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:39,038 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:55:39,039 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:55:39,040 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 [2020-07-20 16:55:39,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:55:39,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-20 16:55:39,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 16:55:39,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-20 16:55:39,057 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-20 16:55:39,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:39,058 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-20 16:55:39,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:55:39,059 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-20 16:55:39,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 16:55:39,063 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:39,063 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] [2020-07-20 16:55:39,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:39,278 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:39,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:39,279 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-20 16:55:39,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:39,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1854754665] [2020-07-20 16:55:39,281 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:39,360 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:39,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:39,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:55:39,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:39,460 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 16:55:39,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:40,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:40,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:40,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:40,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:40,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:40,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:40,312 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-20 16:55:40,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1854754665] [2020-07-20 16:55:40,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:40,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:55:40,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661954609] [2020-07-20 16:55:40,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:55:40,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:40,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:55:40,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:55:40,317 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-20 16:55:40,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:40,579 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-20 16:55:40,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:55:40,580 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-20 16:55:40,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:40,583 INFO L225 Difference]: With dead ends: 75 [2020-07-20 16:55:40,583 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 16:55:40,585 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 [2020-07-20 16:55:40,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 16:55:40,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-20 16:55:40,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 16:55:40,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-20 16:55:40,618 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-20 16:55:40,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:40,619 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-20 16:55:40,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:55:40,619 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-20 16:55:40,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:55:40,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:40,633 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] [2020-07-20 16:55:40,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:40,849 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:40,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:40,849 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-20 16:55:40,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:40,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1221342568] [2020-07-20 16:55:40,850 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:40,922 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:40,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:40,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:55:40,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:41,043 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 16:55:41,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:41,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:41,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:41,660 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:55:41,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1221342568] [2020-07-20 16:55:41,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:41,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:55:41,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548464865] [2020-07-20 16:55:41,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:55:41,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:41,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:55:41,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:55:41,672 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-20 16:55:41,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:41,956 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-20 16:55:41,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:55:41,957 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-20 16:55:41,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:41,959 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:55:41,960 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:55:41,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:55:41,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:55:41,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:55:41,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:55:41,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-20 16:55:41,980 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-20 16:55:41,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:41,981 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-20 16:55:41,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:55:41,981 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-20 16:55:41,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:55:41,984 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:41,984 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] [2020-07-20 16:55:42,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:42,199 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:42,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:42,202 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-20 16:55:42,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:42,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105770641] [2020-07-20 16:55:42,203 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:42,267 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:42,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:42,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:55:42,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:42,397 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 16:55:42,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:42,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:43,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:43,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:43,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:43,255 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 16:55:43,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105770641] [2020-07-20 16:55:43,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:43,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:55:43,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767497221] [2020-07-20 16:55:43,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:55:43,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:43,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:55:43,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:55:43,260 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-20 16:55:43,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:43,838 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-20 16:55:43,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:55:43,840 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-20 16:55:43,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:43,845 INFO L225 Difference]: With dead ends: 131 [2020-07-20 16:55:43,845 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 16:55:43,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:55:43,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 16:55:43,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-20 16:55:43,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-20 16:55:43,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-20 16:55:43,902 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-20 16:55:43,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:43,903 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-20 16:55:43,904 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:55:43,905 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-20 16:55:43,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-20 16:55:43,908 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:43,911 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] [2020-07-20 16:55:44,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:44,118 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:44,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:44,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-20 16:55:44,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:44,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788575885] [2020-07-20 16:55:44,121 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:44,196 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:44,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:44,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:55:44,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:44,375 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 16:55:44,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:44,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:44,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:45,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:45,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:45,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:45,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:45,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:45,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:45,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:45,488 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 16:55:45,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788575885] [2020-07-20 16:55:45,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:45,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:55:45,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213913384] [2020-07-20 16:55:45,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:55:45,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:45,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:55:45,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:55:45,493 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-20 16:55:46,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:46,787 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-20 16:55:46,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 16:55:46,789 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-20 16:55:46,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:46,796 INFO L225 Difference]: With dead ends: 186 [2020-07-20 16:55:46,796 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 16:55:46,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:55:46,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 16:55:46,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-20 16:55:46,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 16:55:46,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-20 16:55:46,828 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-20 16:55:46,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:46,829 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-20 16:55:46,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:55:46,829 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-20 16:55:46,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:55:46,832 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:46,832 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] [2020-07-20 16:55:47,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:47,047 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:47,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:47,048 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-20 16:55:47,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:47,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [371820519] [2020-07-20 16:55:47,049 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:47,122 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:47,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:47,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:55:47,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:47,208 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-20 16:55:47,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:47,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:47,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:47,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:47,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:47,927 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:55:47,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [371820519] [2020-07-20 16:55:47,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:47,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:55:47,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042743829] [2020-07-20 16:55:47,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:55:47,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:47,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:55:47,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:55:47,931 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-20 16:55:48,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:48,191 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-20 16:55:48,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:55:48,192 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-20 16:55:48,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:48,195 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:55:48,196 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 16:55:48,198 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:55:48,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 16:55:48,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-20 16:55:48,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-20 16:55:48,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-20 16:55:48,238 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-20 16:55:48,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:48,239 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-20 16:55:48,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:55:48,239 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-20 16:55:48,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-20 16:55:48,242 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:48,242 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] [2020-07-20 16:55:48,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:48,457 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:48,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:48,458 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-20 16:55:48,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:48,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [164845654] [2020-07-20 16:55:48,460 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:48,558 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:48,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:48,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:55:48,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:48,709 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-20 16:55:48,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:49,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:49,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:49,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:49,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:49,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:49,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:49,655 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-20 16:55:49,656 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [164845654] [2020-07-20 16:55:49,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:49,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-20 16:55:49,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394056799] [2020-07-20 16:55:49,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:55:49,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:49,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:55:49,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:55:49,659 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-20 16:55:50,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:50,355 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-20 16:55:50,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:55:50,358 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-20 16:55:50,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:50,362 INFO L225 Difference]: With dead ends: 269 [2020-07-20 16:55:50,363 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 16:55:50,366 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:55:50,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 16:55:50,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-20 16:55:50,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 16:55:50,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-20 16:55:50,393 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-20 16:55:50,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:50,393 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-20 16:55:50,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:55:50,394 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-20 16:55:50,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 16:55:50,397 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:50,398 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] [2020-07-20 16:55:50,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:50,613 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:50,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:50,615 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-20 16:55:50,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:50,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836768038] [2020-07-20 16:55:50,616 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:50,706 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:50,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:50,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:55:50,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:50,778 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-20 16:55:50,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:51,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:51,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:51,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:51,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:51,276 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-20 16:55:51,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836768038] [2020-07-20 16:55:51,277 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:51,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:55:51,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156935348] [2020-07-20 16:55:51,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:55:51,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:51,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:55:51,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:55:51,281 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-20 16:55:51,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:51,514 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-20 16:55:51,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:55:51,516 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-20 16:55:51,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:51,523 INFO L225 Difference]: With dead ends: 167 [2020-07-20 16:55:51,523 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 16:55:51,529 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 [2020-07-20 16:55:51,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 16:55:51,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-20 16:55:51,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 16:55:51,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-20 16:55:51,569 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-20 16:55:51,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:51,570 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-20 16:55:51,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:55:51,571 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-20 16:55:51,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:55:51,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:51,578 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] [2020-07-20 16:55:51,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:51,794 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:51,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:51,795 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-20 16:55:51,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:51,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [648128835] [2020-07-20 16:55:51,797 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:51,914 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:51,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:51,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:55:51,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:52,062 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-20 16:55:52,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:53,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:53,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:53,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:53,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:53,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:53,634 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 16:55:53,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [648128835] [2020-07-20 16:55:53,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:53,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:55:53,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798980501] [2020-07-20 16:55:53,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:55:53,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:53,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:55:53,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:55:53,651 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-20 16:55:54,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:54,463 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-20 16:55:54,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:55:54,464 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-20 16:55:54,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:54,473 INFO L225 Difference]: With dead ends: 369 [2020-07-20 16:55:54,474 INFO L226 Difference]: Without dead ends: 218 [2020-07-20 16:55:54,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:55:54,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-20 16:55:54,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-20 16:55:54,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 16:55:54,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-20 16:55:54,525 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-20 16:55:54,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:54,526 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-20 16:55:54,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:55:54,527 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-20 16:55:54,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-20 16:55:54,532 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:54,533 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] [2020-07-20 16:55:54,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:54,748 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:54,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:54,749 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-20 16:55:54,749 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:54,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2082746252] [2020-07-20 16:55:54,750 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:54,844 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:54,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:54,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:55:54,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:54,917 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-20 16:55:54,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:55,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:55,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:55,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:55,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:55,406 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-20 16:55:55,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2082746252] [2020-07-20 16:55:55,408 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:55,408 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:55:55,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171094230] [2020-07-20 16:55:55,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:55:55,409 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:55,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:55:55,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:55:55,410 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-20 16:55:55,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:55,598 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-20 16:55:55,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:55:55,599 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-20 16:55:55,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:55,603 INFO L225 Difference]: With dead ends: 191 [2020-07-20 16:55:55,603 INFO L226 Difference]: Without dead ends: 187 [2020-07-20 16:55:55,604 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 [2020-07-20 16:55:55,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-20 16:55:55,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-20 16:55:55,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 16:55:55,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-20 16:55:55,624 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-20 16:55:55,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:55,625 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-20 16:55:55,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:55:55,625 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-20 16:55:55,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-07-20 16:55:55,628 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:55,629 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:55,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:55,844 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:55,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:55,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1156827333, now seen corresponding path program 2 times [2020-07-20 16:55:55,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:55,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [917165735] [2020-07-20 16:55:55,846 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:55,937 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:55,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:55,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:55:55,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:56,094 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 84 proven. 110 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2020-07-20 16:55:56,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:56,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:56,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:56,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:57,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:57,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:57,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:57,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:57,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:57,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:57,542 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 84 proven. 116 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2020-07-20 16:55:57,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [917165735] [2020-07-20 16:55:57,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:57,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 23 [2020-07-20 16:55:57,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548787294] [2020-07-20 16:55:57,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:55:57,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:57,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:55:57,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:55:57,545 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 23 states. [2020-07-20 16:55:58,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:58,516 INFO L93 Difference]: Finished difference Result 393 states and 799 transitions. [2020-07-20 16:55:58,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 16:55:58,518 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 118 [2020-07-20 16:55:58,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:58,524 INFO L225 Difference]: With dead ends: 393 [2020-07-20 16:55:58,525 INFO L226 Difference]: Without dead ends: 222 [2020-07-20 16:55:58,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 207 SyntacticMatches, 13 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=261, Invalid=1221, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:55:58,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2020-07-20 16:55:58,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 183. [2020-07-20 16:55:58,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-07-20 16:55:58,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 321 transitions. [2020-07-20 16:55:58,570 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 321 transitions. Word has length 118 [2020-07-20 16:55:58,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:58,571 INFO L479 AbstractCegarLoop]: Abstraction has 183 states and 321 transitions. [2020-07-20 16:55:58,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:55:58,572 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 321 transitions. [2020-07-20 16:55:58,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 16:55:58,576 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:58,576 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] [2020-07-20 16:55:58,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:58,791 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:58,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:58,792 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-20 16:55:58,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:58,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488679579] [2020-07-20 16:55:58,793 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:58,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:58,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:58,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:55:58,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:59,086 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-20 16:55:59,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:59,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:59,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:00,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:00,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:00,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:00,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:00,286 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-20 16:56:00,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488679579] [2020-07-20 16:56:00,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:00,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:56:00,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312863233] [2020-07-20 16:56:00,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:56:00,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:00,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:56:00,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:56:00,290 INFO L87 Difference]: Start difference. First operand 183 states and 321 transitions. Second operand 16 states. [2020-07-20 16:56:00,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:00,559 INFO L93 Difference]: Finished difference Result 203 states and 360 transitions. [2020-07-20 16:56:00,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:56:00,560 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 117 [2020-07-20 16:56:00,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:00,564 INFO L225 Difference]: With dead ends: 203 [2020-07-20 16:56:00,565 INFO L226 Difference]: Without dead ends: 199 [2020-07-20 16:56:00,566 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 [2020-07-20 16:56:00,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2020-07-20 16:56:00,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 188. [2020-07-20 16:56:00,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 16:56:00,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 333 transitions. [2020-07-20 16:56:00,590 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 333 transitions. Word has length 117 [2020-07-20 16:56:00,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:00,591 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 333 transitions. [2020-07-20 16:56:00,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:56:00,591 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 333 transitions. [2020-07-20 16:56:00,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:56:00,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:00,595 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] [2020-07-20 16:56:00,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:00,809 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:00,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:00,810 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-20 16:56:00,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:00,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [848945359] [2020-07-20 16:56:00,811 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:00,931 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:00,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:00,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:00,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:01,144 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 16:56:01,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:01,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:01,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:02,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:02,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:02,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:02,486 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-20 16:56:02,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [848945359] [2020-07-20 16:56:02,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:02,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:56:02,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283261734] [2020-07-20 16:56:02,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:56:02,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:02,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:56:02,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:56:02,491 INFO L87 Difference]: Start difference. First operand 188 states and 333 transitions. Second operand 17 states. [2020-07-20 16:56:03,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:03,066 INFO L93 Difference]: Finished difference Result 374 states and 685 transitions. [2020-07-20 16:56:03,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:56:03,067 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-20 16:56:03,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:03,071 INFO L225 Difference]: With dead ends: 374 [2020-07-20 16:56:03,072 INFO L226 Difference]: Without dead ends: 192 [2020-07-20 16:56:03,075 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:56:03,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-20 16:56:03,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-20 16:56:03,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 16:56:03,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 327 transitions. [2020-07-20 16:56:03,097 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 327 transitions. Word has length 120 [2020-07-20 16:56:03,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:03,098 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 327 transitions. [2020-07-20 16:56:03,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:56:03,099 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 327 transitions. [2020-07-20 16:56:03,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-20 16:56:03,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:03,103 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:03,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:03,317 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:03,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:03,318 INFO L82 PathProgramCache]: Analyzing trace with hash 594466134, now seen corresponding path program 6 times [2020-07-20 16:56:03,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:03,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [96043374] [2020-07-20 16:56:03,319 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:03,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:03,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:03,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:56:03,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:03,564 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 73 proven. 91 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-20 16:56:03,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:04,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:04,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:04,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:04,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:05,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:05,088 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 73 proven. 97 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2020-07-20 16:56:05,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [96043374] [2020-07-20 16:56:05,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:05,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:56:05,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345326748] [2020-07-20 16:56:05,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:56:05,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:05,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:56:05,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:56:05,095 INFO L87 Difference]: Start difference. First operand 190 states and 327 transitions. Second operand 21 states. [2020-07-20 16:56:05,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:05,853 INFO L93 Difference]: Finished difference Result 387 states and 724 transitions. [2020-07-20 16:56:05,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:56:05,854 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 107 [2020-07-20 16:56:05,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:05,858 INFO L225 Difference]: With dead ends: 387 [2020-07-20 16:56:05,858 INFO L226 Difference]: Without dead ends: 201 [2020-07-20 16:56:05,861 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 185 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:56:05,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-20 16:56:05,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 180. [2020-07-20 16:56:05,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2020-07-20 16:56:05,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 284 transitions. [2020-07-20 16:56:05,878 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 284 transitions. Word has length 107 [2020-07-20 16:56:05,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:05,879 INFO L479 AbstractCegarLoop]: Abstraction has 180 states and 284 transitions. [2020-07-20 16:56:05,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:56:05,879 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 284 transitions. [2020-07-20 16:56:05,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:56:05,882 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:05,883 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:06,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:06,099 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:06,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:06,099 INFO L82 PathProgramCache]: Analyzing trace with hash -77183713, now seen corresponding path program 7 times [2020-07-20 16:56:06,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:06,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127631237] [2020-07-20 16:56:06,100 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:06,249 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:06,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:06,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:06,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:06,352 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 21 proven. 126 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2020-07-20 16:56:06,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:07,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:07,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:07,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:07,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:07,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:07,370 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 21 proven. 136 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2020-07-20 16:56:07,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127631237] [2020-07-20 16:56:07,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:07,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:56:07,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153551723] [2020-07-20 16:56:07,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:56:07,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:07,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:56:07,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:56:07,377 INFO L87 Difference]: Start difference. First operand 180 states and 284 transitions. Second operand 16 states. [2020-07-20 16:56:07,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:07,695 INFO L93 Difference]: Finished difference Result 214 states and 364 transitions. [2020-07-20 16:56:07,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:56:07,700 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 121 [2020-07-20 16:56:07,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:07,704 INFO L225 Difference]: With dead ends: 214 [2020-07-20 16:56:07,704 INFO L226 Difference]: Without dead ends: 210 [2020-07-20 16:56:07,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 218 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:56:07,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2020-07-20 16:56:07,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 207. [2020-07-20 16:56:07,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:56:07,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 352 transitions. [2020-07-20 16:56:07,735 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 352 transitions. Word has length 121 [2020-07-20 16:56:07,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:07,736 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 352 transitions. [2020-07-20 16:56:07,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:56:07,736 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 352 transitions. [2020-07-20 16:56:07,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:56:07,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:07,742 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:07,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:07,957 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:07,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:07,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1905629551, now seen corresponding path program 8 times [2020-07-20 16:56:07,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:07,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [291902928] [2020-07-20 16:56:07,959 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:08,127 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:08,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:08,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:08,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:08,231 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 86 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2020-07-20 16:56:08,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:08,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:08,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:08,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:08,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:08,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:08,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:08,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:09,038 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 91 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-20 16:56:09,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [291902928] [2020-07-20 16:56:09,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:09,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:56:09,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901605629] [2020-07-20 16:56:09,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:56:09,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:09,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:56:09,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:09,042 INFO L87 Difference]: Start difference. First operand 207 states and 352 transitions. Second operand 14 states. [2020-07-20 16:56:09,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:09,443 INFO L93 Difference]: Finished difference Result 237 states and 416 transitions. [2020-07-20 16:56:09,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:56:09,445 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-20 16:56:09,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:09,451 INFO L225 Difference]: With dead ends: 237 [2020-07-20 16:56:09,451 INFO L226 Difference]: Without dead ends: 233 [2020-07-20 16:56:09,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:56:09,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2020-07-20 16:56:09,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 207. [2020-07-20 16:56:09,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:56:09,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 352 transitions. [2020-07-20 16:56:09,492 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 352 transitions. Word has length 121 [2020-07-20 16:56:09,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:09,498 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 352 transitions. [2020-07-20 16:56:09,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:56:09,499 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 352 transitions. [2020-07-20 16:56:09,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 16:56:09,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:09,507 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:09,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:09,722 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:09,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:09,722 INFO L82 PathProgramCache]: Analyzing trace with hash 2023571201, now seen corresponding path program 3 times [2020-07-20 16:56:09,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:09,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1825623095] [2020-07-20 16:56:09,726 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:09,971 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:09,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:09,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:09,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:10,105 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 77 proven. 92 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2020-07-20 16:56:10,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:10,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:10,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:10,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:10,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:11,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:11,252 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 77 proven. 97 refuted. 0 times theorem prover too weak. 348 trivial. 0 not checked. [2020-07-20 16:56:11,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1825623095] [2020-07-20 16:56:11,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:11,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:56:11,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207835967] [2020-07-20 16:56:11,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:56:11,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:11,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:56:11,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:11,262 INFO L87 Difference]: Start difference. First operand 207 states and 352 transitions. Second operand 14 states. [2020-07-20 16:56:11,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:11,594 INFO L93 Difference]: Finished difference Result 227 states and 392 transitions. [2020-07-20 16:56:11,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:56:11,595 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 145 [2020-07-20 16:56:11,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:11,602 INFO L225 Difference]: With dead ends: 227 [2020-07-20 16:56:11,603 INFO L226 Difference]: Without dead ends: 223 [2020-07-20 16:56:11,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:56:11,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2020-07-20 16:56:11,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 207. [2020-07-20 16:56:11,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:56:11,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 352 transitions. [2020-07-20 16:56:11,636 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 352 transitions. Word has length 145 [2020-07-20 16:56:11,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:11,637 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 352 transitions. [2020-07-20 16:56:11,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:56:11,637 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 352 transitions. [2020-07-20 16:56:11,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2020-07-20 16:56:11,642 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:11,643 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 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, 1] [2020-07-20 16:56:11,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:11,859 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:11,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:11,859 INFO L82 PathProgramCache]: Analyzing trace with hash 857210524, now seen corresponding path program 9 times [2020-07-20 16:56:11,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:11,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1902531152] [2020-07-20 16:56:11,860 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:11,983 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:56:11,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:11,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:11,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:12,104 INFO L134 CoverageAnalysis]: Checked inductivity of 620 backedges. 350 proven. 32 refuted. 0 times theorem prover too weak. 238 trivial. 0 not checked. [2020-07-20 16:56:12,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:13,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:13,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:13,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:13,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:13,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:13,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:13,519 INFO L134 CoverageAnalysis]: Checked inductivity of 620 backedges. 81 proven. 204 refuted. 0 times theorem prover too weak. 335 trivial. 0 not checked. [2020-07-20 16:56:13,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1902531152] [2020-07-20 16:56:13,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:13,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:56:13,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615897535] [2020-07-20 16:56:13,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:56:13,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:13,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:56:13,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:56:13,523 INFO L87 Difference]: Start difference. First operand 207 states and 352 transitions. Second operand 17 states. [2020-07-20 16:56:14,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:14,102 INFO L93 Difference]: Finished difference Result 409 states and 721 transitions. [2020-07-20 16:56:14,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:56:14,104 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 158 [2020-07-20 16:56:14,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:14,108 INFO L225 Difference]: With dead ends: 409 [2020-07-20 16:56:14,109 INFO L226 Difference]: Without dead ends: 207 [2020-07-20 16:56:14,113 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 290 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:56:14,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2020-07-20 16:56:14,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 191. [2020-07-20 16:56:14,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2020-07-20 16:56:14,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 303 transitions. [2020-07-20 16:56:14,140 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 303 transitions. Word has length 158 [2020-07-20 16:56:14,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:14,141 INFO L479 AbstractCegarLoop]: Abstraction has 191 states and 303 transitions. [2020-07-20 16:56:14,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:56:14,142 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 303 transitions. [2020-07-20 16:56:14,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2020-07-20 16:56:14,147 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:14,147 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] [2020-07-20 16:56:14,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:14,362 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:14,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:14,363 INFO L82 PathProgramCache]: Analyzing trace with hash -146170438, now seen corresponding path program 4 times [2020-07-20 16:56:14,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:14,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [916936613] [2020-07-20 16:56:14,368 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:14,608 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:14,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:14,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:14,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:14,747 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 139 proven. 46 refuted. 0 times theorem prover too weak. 429 trivial. 0 not checked. [2020-07-20 16:56:14,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:15,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:15,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:15,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:15,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:15,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:15,994 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 141 proven. 49 refuted. 0 times theorem prover too weak. 424 trivial. 0 not checked. [2020-07-20 16:56:15,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [916936613] [2020-07-20 16:56:15,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:15,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:56:15,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506846440] [2020-07-20 16:56:15,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:56:15,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:15,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:56:15,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:15,999 INFO L87 Difference]: Start difference. First operand 191 states and 303 transitions. Second operand 14 states. [2020-07-20 16:56:16,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:16,305 INFO L93 Difference]: Finished difference Result 198 states and 314 transitions. [2020-07-20 16:56:16,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:56:16,306 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 157 [2020-07-20 16:56:16,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:16,311 INFO L225 Difference]: With dead ends: 198 [2020-07-20 16:56:16,312 INFO L226 Difference]: Without dead ends: 194 [2020-07-20 16:56:16,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 295 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:56:16,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-07-20 16:56:16,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 174. [2020-07-20 16:56:16,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-20 16:56:16,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 269 transitions. [2020-07-20 16:56:16,337 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 269 transitions. Word has length 157 [2020-07-20 16:56:16,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:16,338 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 269 transitions. [2020-07-20 16:56:16,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:56:16,338 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 269 transitions. [2020-07-20 16:56:16,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2020-07-20 16:56:16,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:16,343 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 14, 12, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:16,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:16,559 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:16,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:16,560 INFO L82 PathProgramCache]: Analyzing trace with hash -1138083817, now seen corresponding path program 10 times [2020-07-20 16:56:16,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:16,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1954017769] [2020-07-20 16:56:16,561 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:16,757 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:16,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:16,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:56:16,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:16,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 817 proven. 169 refuted. 0 times theorem prover too weak. 419 trivial. 0 not checked. [2020-07-20 16:56:16,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:18,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:19,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:19,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:19,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:19,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:19,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 154 proven. 476 refuted. 0 times theorem prover too weak. 775 trivial. 0 not checked. [2020-07-20 16:56:19,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1954017769] [2020-07-20 16:56:19,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:19,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:56:19,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117515008] [2020-07-20 16:56:19,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:56:19,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:19,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:56:19,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:56:19,457 INFO L87 Difference]: Start difference. First operand 174 states and 269 transitions. Second operand 23 states. [2020-07-20 16:56:20,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:20,695 INFO L93 Difference]: Finished difference Result 382 states and 655 transitions. [2020-07-20 16:56:20,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 16:56:20,697 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 231 [2020-07-20 16:56:20,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:20,702 INFO L225 Difference]: With dead ends: 382 [2020-07-20 16:56:20,702 INFO L226 Difference]: Without dead ends: 209 [2020-07-20 16:56:20,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 423 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:56:20,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-20 16:56:20,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 189. [2020-07-20 16:56:20,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2020-07-20 16:56:20,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 290 transitions. [2020-07-20 16:56:20,730 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 290 transitions. Word has length 231 [2020-07-20 16:56:20,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:20,731 INFO L479 AbstractCegarLoop]: Abstraction has 189 states and 290 transitions. [2020-07-20 16:56:20,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:56:20,731 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 290 transitions. [2020-07-20 16:56:20,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 16:56:20,736 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:20,736 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 19, 17, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 7, 7, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:20,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:20,950 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:20,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:20,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1758719145, now seen corresponding path program 11 times [2020-07-20 16:56:20,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:20,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827762264] [2020-07-20 16:56:20,952 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:21,228 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:56:21,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:21,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:56:21,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:21,574 INFO L134 CoverageAnalysis]: Checked inductivity of 3139 backedges. 1724 proven. 136 refuted. 0 times theorem prover too weak. 1279 trivial. 0 not checked. [2020-07-20 16:56:21,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:23,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:23,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:24,031 INFO L134 CoverageAnalysis]: Checked inductivity of 3139 backedges. 228 proven. 686 refuted. 0 times theorem prover too weak. 2225 trivial. 0 not checked. [2020-07-20 16:56:24,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827762264] [2020-07-20 16:56:24,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:24,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:56:24,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474777887] [2020-07-20 16:56:24,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:56:24,034 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:24,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:56:24,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:56:24,035 INFO L87 Difference]: Start difference. First operand 189 states and 290 transitions. Second operand 21 states. [2020-07-20 16:56:25,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:25,003 INFO L93 Difference]: Finished difference Result 471 states and 777 transitions. [2020-07-20 16:56:25,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:56:25,004 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 337 [2020-07-20 16:56:25,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:25,009 INFO L225 Difference]: With dead ends: 471 [2020-07-20 16:56:25,009 INFO L226 Difference]: Without dead ends: 242 [2020-07-20 16:56:25,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 688 GetRequests, 639 SyntacticMatches, 15 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=229, Invalid=1031, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 16:56:25,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2020-07-20 16:56:25,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 185. [2020-07-20 16:56:25,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2020-07-20 16:56:25,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 291 transitions. [2020-07-20 16:56:25,031 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 291 transitions. Word has length 337 [2020-07-20 16:56:25,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:25,032 INFO L479 AbstractCegarLoop]: Abstraction has 185 states and 291 transitions. [2020-07-20 16:56:25,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:56:25,032 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 291 transitions. [2020-07-20 16:56:25,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2020-07-20 16:56:25,035 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:25,036 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 12, 11, 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] [2020-07-20 16:56:25,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:25,250 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:25,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:25,251 INFO L82 PathProgramCache]: Analyzing trace with hash -31808317, now seen corresponding path program 12 times [2020-07-20 16:56:25,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:25,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2040426460] [2020-07-20 16:56:25,252 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:25,436 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:25,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:25,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:56:25,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:25,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 214 proven. 358 refuted. 0 times theorem prover too weak. 501 trivial. 0 not checked. [2020-07-20 16:56:25,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:27,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:27,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:27,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:27,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:27,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:27,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 214 proven. 378 refuted. 0 times theorem prover too weak. 481 trivial. 0 not checked. [2020-07-20 16:56:28,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2040426460] [2020-07-20 16:56:28,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:28,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-20 16:56:28,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304345274] [2020-07-20 16:56:28,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 16:56:28,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:28,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 16:56:28,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:56:28,723 INFO L87 Difference]: Start difference. First operand 185 states and 291 transitions. Second operand 27 states. [2020-07-20 16:56:30,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:30,534 INFO L93 Difference]: Finished difference Result 411 states and 712 transitions. [2020-07-20 16:56:30,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 16:56:30,535 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 204 [2020-07-20 16:56:30,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:30,538 INFO L225 Difference]: With dead ends: 411 [2020-07-20 16:56:30,539 INFO L226 Difference]: Without dead ends: 231 [2020-07-20 16:56:30,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 361 SyntacticMatches, 21 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=408, Invalid=2042, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 16:56:30,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2020-07-20 16:56:30,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 207. [2020-07-20 16:56:30,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:56:30,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 318 transitions. [2020-07-20 16:56:30,558 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 318 transitions. Word has length 204 [2020-07-20 16:56:30,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:30,558 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 318 transitions. [2020-07-20 16:56:30,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 16:56:30,558 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 318 transitions. [2020-07-20 16:56:30,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2020-07-20 16:56:30,561 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:30,561 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 10, 10, 9, 8, 7, 7, 7, 7, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:30,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:30,777 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:30,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:30,778 INFO L82 PathProgramCache]: Analyzing trace with hash 488902283, now seen corresponding path program 13 times [2020-07-20 16:56:30,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:30,778 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1067747877] [2020-07-20 16:56:30,779 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:30,977 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:30,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:30,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:56:30,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:31,168 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 223 proven. 177 refuted. 0 times theorem prover too weak. 388 trivial. 0 not checked. [2020-07-20 16:56:31,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:32,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,958 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 225 proven. 184 refuted. 0 times theorem prover too weak. 379 trivial. 0 not checked. [2020-07-20 16:56:32,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1067747877] [2020-07-20 16:56:32,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:32,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:56:32,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895625836] [2020-07-20 16:56:32,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:56:32,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:32,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:56:32,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:56:32,960 INFO L87 Difference]: Start difference. First operand 207 states and 318 transitions. Second operand 23 states. [2020-07-20 16:56:33,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:33,794 INFO L93 Difference]: Finished difference Result 412 states and 651 transitions. [2020-07-20 16:56:33,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:56:33,795 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 174 [2020-07-20 16:56:33,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:33,798 INFO L225 Difference]: With dead ends: 412 [2020-07-20 16:56:33,798 INFO L226 Difference]: Without dead ends: 205 [2020-07-20 16:56:33,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 309 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=220, Invalid=1112, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:56:33,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-07-20 16:56:33,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 187. [2020-07-20 16:56:33,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2020-07-20 16:56:33,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 267 transitions. [2020-07-20 16:56:33,817 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 267 transitions. Word has length 174 [2020-07-20 16:56:33,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:33,817 INFO L479 AbstractCegarLoop]: Abstraction has 187 states and 267 transitions. [2020-07-20 16:56:33,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:56:33,817 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 267 transitions. [2020-07-20 16:56:33,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-20 16:56:33,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:33,820 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] [2020-07-20 16:56:34,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:34,034 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:34,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:34,034 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 14 times [2020-07-20 16:56:34,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:34,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [535609659] [2020-07-20 16:56:34,035 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:34,227 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:34,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:34,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:56:34,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:34,324 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 45 proven. 260 refuted. 0 times theorem prover too weak. 481 trivial. 0 not checked. [2020-07-20 16:56:34,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:35,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:35,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:35,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:35,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:35,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:35,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:35,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:35,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:36,015 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 45 proven. 276 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2020-07-20 16:56:36,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [535609659] [2020-07-20 16:56:36,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:36,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:56:36,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543387600] [2020-07-20 16:56:36,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:56:36,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:36,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:56:36,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:56:36,019 INFO L87 Difference]: Start difference. First operand 187 states and 267 transitions. Second operand 18 states. [2020-07-20 16:56:36,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:36,283 INFO L93 Difference]: Finished difference Result 194 states and 276 transitions. [2020-07-20 16:56:36,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:56:36,284 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 177 [2020-07-20 16:56:36,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:36,286 INFO L225 Difference]: With dead ends: 194 [2020-07-20 16:56:36,287 INFO L226 Difference]: Without dead ends: 190 [2020-07-20 16:56:36,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 325 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:56:36,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2020-07-20 16:56:36,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 187. [2020-07-20 16:56:36,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2020-07-20 16:56:36,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 267 transitions. [2020-07-20 16:56:36,298 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 267 transitions. Word has length 177 [2020-07-20 16:56:36,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:36,299 INFO L479 AbstractCegarLoop]: Abstraction has 187 states and 267 transitions. [2020-07-20 16:56:36,299 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:56:36,299 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 267 transitions. [2020-07-20 16:56:36,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2020-07-20 16:56:36,302 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:36,302 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 14, 14, 13, 12, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 6, 6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:36,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:36,517 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:36,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:36,517 INFO L82 PathProgramCache]: Analyzing trace with hash -680382423, now seen corresponding path program 15 times [2020-07-20 16:56:36,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:36,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945532221] [2020-07-20 16:56:36,517 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:36,744 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:36,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:36,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:56:36,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:36,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1420 backedges. 291 proven. 345 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2020-07-20 16:56:36,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:38,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:38,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:38,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:38,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:38,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:38,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:38,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:38,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,266 INFO L134 CoverageAnalysis]: Checked inductivity of 1420 backedges. 291 proven. 360 refuted. 0 times theorem prover too weak. 769 trivial. 0 not checked. [2020-07-20 16:56:39,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945532221] [2020-07-20 16:56:39,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:39,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:56:39,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685902336] [2020-07-20 16:56:39,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:56:39,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:39,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:56:39,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:56:39,268 INFO L87 Difference]: Start difference. First operand 187 states and 267 transitions. Second operand 25 states. [2020-07-20 16:56:40,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:40,516 INFO L93 Difference]: Finished difference Result 479 states and 741 transitions. [2020-07-20 16:56:40,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 16:56:40,517 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 230 [2020-07-20 16:56:40,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:40,520 INFO L225 Difference]: With dead ends: 479 [2020-07-20 16:56:40,520 INFO L226 Difference]: Without dead ends: 259 [2020-07-20 16:56:40,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 417 SyntacticMatches, 19 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=334, Invalid=1646, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 16:56:40,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2020-07-20 16:56:40,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 206. [2020-07-20 16:56:40,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-20 16:56:40,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 298 transitions. [2020-07-20 16:56:40,535 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 298 transitions. Word has length 230 [2020-07-20 16:56:40,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:40,536 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 298 transitions. [2020-07-20 16:56:40,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:56:40,536 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 298 transitions. [2020-07-20 16:56:40,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2020-07-20 16:56:40,538 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:40,539 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 22, 22, 17, 14, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:40,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:40,753 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:40,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:40,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1970944510, now seen corresponding path program 16 times [2020-07-20 16:56:40,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:40,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1246261417] [2020-07-20 16:56:40,753 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:41,012 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:41,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:41,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 474 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:56:41,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:41,213 INFO L134 CoverageAnalysis]: Checked inductivity of 2835 backedges. 1675 proven. 121 refuted. 0 times theorem prover too weak. 1039 trivial. 0 not checked. [2020-07-20 16:56:41,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:42,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:43,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:43,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:43,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:43,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:43,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:43,440 INFO L134 CoverageAnalysis]: Checked inductivity of 2835 backedges. 278 proven. 582 refuted. 0 times theorem prover too weak. 1975 trivial. 0 not checked. [2020-07-20 16:56:43,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1246261417] [2020-07-20 16:56:43,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:43,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:56:43,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418898092] [2020-07-20 16:56:43,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:56:43,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:43,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:56:43,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:56:43,442 INFO L87 Difference]: Start difference. First operand 206 states and 298 transitions. Second operand 21 states. [2020-07-20 16:56:44,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:44,347 INFO L93 Difference]: Finished difference Result 547 states and 861 transitions. [2020-07-20 16:56:44,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:56:44,348 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 320 [2020-07-20 16:56:44,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:44,351 INFO L225 Difference]: With dead ends: 547 [2020-07-20 16:56:44,351 INFO L226 Difference]: Without dead ends: 265 [2020-07-20 16:56:44,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 605 SyntacticMatches, 15 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=223, Invalid=1037, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 16:56:44,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2020-07-20 16:56:44,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 220. [2020-07-20 16:56:44,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2020-07-20 16:56:44,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 326 transitions. [2020-07-20 16:56:44,366 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 326 transitions. Word has length 320 [2020-07-20 16:56:44,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:44,366 INFO L479 AbstractCegarLoop]: Abstraction has 220 states and 326 transitions. [2020-07-20 16:56:44,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:56:44,367 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 326 transitions. [2020-07-20 16:56:44,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-20 16:56:44,369 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:44,370 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 22, 22, 17, 16, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 8, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:44,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:44,583 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:44,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:44,583 INFO L82 PathProgramCache]: Analyzing trace with hash 1743094630, now seen corresponding path program 17 times [2020-07-20 16:56:44,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:44,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1187751876] [2020-07-20 16:56:44,584 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:44,848 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:44,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:44,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:56:44,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:45,082 INFO L134 CoverageAnalysis]: Checked inductivity of 2864 backedges. 442 proven. 634 refuted. 0 times theorem prover too weak. 1788 trivial. 0 not checked. [2020-07-20 16:56:45,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:46,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:46,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:47,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:47,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:47,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:47,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:47,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:47,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:47,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,538 INFO L134 CoverageAnalysis]: Checked inductivity of 2864 backedges. 442 proven. 655 refuted. 0 times theorem prover too weak. 1767 trivial. 0 not checked. [2020-07-20 16:56:48,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1187751876] [2020-07-20 16:56:48,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:48,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 29 [2020-07-20 16:56:48,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879598522] [2020-07-20 16:56:48,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:56:48,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:48,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:56:48,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=717, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:56:48,540 INFO L87 Difference]: Start difference. First operand 220 states and 326 transitions. Second operand 29 states. [2020-07-20 16:56:50,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:50,127 INFO L93 Difference]: Finished difference Result 568 states and 959 transitions. [2020-07-20 16:56:50,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 16:56:50,130 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 322 [2020-07-20 16:56:50,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:50,134 INFO L225 Difference]: With dead ends: 568 [2020-07-20 16:56:50,134 INFO L226 Difference]: Without dead ends: 354 [2020-07-20 16:56:50,137 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 597 SyntacticMatches, 19 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 555 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=457, Invalid=2405, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 16:56:50,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2020-07-20 16:56:50,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 286. [2020-07-20 16:56:50,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-20 16:56:50,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 474 transitions. [2020-07-20 16:56:50,157 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 474 transitions. Word has length 322 [2020-07-20 16:56:50,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:50,158 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 474 transitions. [2020-07-20 16:56:50,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:56:50,158 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 474 transitions. [2020-07-20 16:56:50,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 16:56:50,161 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:50,161 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] [2020-07-20 16:56:50,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:50,377 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:50,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:50,378 INFO L82 PathProgramCache]: Analyzing trace with hash -1711365749, now seen corresponding path program 18 times [2020-07-20 16:56:50,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:50,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1750495484] [2020-07-20 16:56:50,378 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:50,672 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:50,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:50,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:50,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:50,753 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 200 refuted. 0 times theorem prover too weak. 731 trivial. 0 not checked. [2020-07-20 16:56:50,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:51,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:52,012 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 210 refuted. 0 times theorem prover too weak. 721 trivial. 0 not checked. [2020-07-20 16:56:52,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1750495484] [2020-07-20 16:56:52,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:52,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:56:52,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016097108] [2020-07-20 16:56:52,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:56:52,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:52,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:56:52,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:56:52,013 INFO L87 Difference]: Start difference. First operand 286 states and 474 transitions. Second operand 16 states. [2020-07-20 16:56:52,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:52,233 INFO L93 Difference]: Finished difference Result 304 states and 508 transitions. [2020-07-20 16:56:52,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:56:52,234 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 201 [2020-07-20 16:56:52,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:52,237 INFO L225 Difference]: With dead ends: 304 [2020-07-20 16:56:52,238 INFO L226 Difference]: Without dead ends: 300 [2020-07-20 16:56:52,238 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 [2020-07-20 16:56:52,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2020-07-20 16:56:52,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 290. [2020-07-20 16:56:52,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2020-07-20 16:56:52,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 483 transitions. [2020-07-20 16:56:52,256 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 483 transitions. Word has length 201 [2020-07-20 16:56:52,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:52,257 INFO L479 AbstractCegarLoop]: Abstraction has 290 states and 483 transitions. [2020-07-20 16:56:52,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:56:52,257 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 483 transitions. [2020-07-20 16:56:52,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-20 16:56:52,260 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:52,260 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] [2020-07-20 16:56:52,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:52,476 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:52,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:52,476 INFO L82 PathProgramCache]: Analyzing trace with hash 51685547, now seen corresponding path program 19 times [2020-07-20 16:56:52,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:52,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930501525] [2020-07-20 16:56:52,477 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:52,750 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:52,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:52,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:52,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:52,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1350 backedges. 160 proven. 133 refuted. 0 times theorem prover too weak. 1057 trivial. 0 not checked. [2020-07-20 16:56:52,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:53,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:53,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1350 backedges. 160 proven. 138 refuted. 0 times theorem prover too weak. 1052 trivial. 0 not checked. [2020-07-20 16:56:53,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930501525] [2020-07-20 16:56:53,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:53,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:56:53,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200579073] [2020-07-20 16:56:53,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:56:53,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:53,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:56:53,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:53,902 INFO L87 Difference]: Start difference. First operand 290 states and 483 transitions. Second operand 14 states. [2020-07-20 16:56:54,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:54,090 INFO L93 Difference]: Finished difference Result 333 states and 589 transitions. [2020-07-20 16:56:54,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:56:54,091 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 225 [2020-07-20 16:56:54,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:54,096 INFO L225 Difference]: With dead ends: 333 [2020-07-20 16:56:54,096 INFO L226 Difference]: Without dead ends: 329 [2020-07-20 16:56:54,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 429 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:56:54,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2020-07-20 16:56:54,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 299. [2020-07-20 16:56:54,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2020-07-20 16:56:54,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 510 transitions. [2020-07-20 16:56:54,116 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 510 transitions. Word has length 225 [2020-07-20 16:56:54,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:54,116 INFO L479 AbstractCegarLoop]: Abstraction has 299 states and 510 transitions. [2020-07-20 16:56:54,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:56:54,116 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 510 transitions. [2020-07-20 16:56:54,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2020-07-20 16:56:54,119 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:54,120 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 12, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:54,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:54,331 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:54,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:54,331 INFO L82 PathProgramCache]: Analyzing trace with hash 1389337221, now seen corresponding path program 20 times [2020-07-20 16:56:54,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:54,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224024246] [2020-07-20 16:56:54,332 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:54,613 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:54,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:54,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:56:54,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:54,763 INFO L134 CoverageAnalysis]: Checked inductivity of 2081 backedges. 1074 proven. 279 refuted. 0 times theorem prover too weak. 728 trivial. 0 not checked. [2020-07-20 16:56:54,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:56,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:56,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:57,391 INFO L134 CoverageAnalysis]: Checked inductivity of 2081 backedges. 256 proven. 531 refuted. 0 times theorem prover too weak. 1294 trivial. 0 not checked. [2020-07-20 16:56:57,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224024246] [2020-07-20 16:56:57,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:57,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:56:57,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713853757] [2020-07-20 16:56:57,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:56:57,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:57,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:56:57,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:56:57,393 INFO L87 Difference]: Start difference. First operand 299 states and 510 transitions. Second operand 23 states. [2020-07-20 16:56:58,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:58,134 INFO L93 Difference]: Finished difference Result 641 states and 1176 transitions. [2020-07-20 16:56:58,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 16:56:58,135 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 276 [2020-07-20 16:56:58,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:58,139 INFO L225 Difference]: With dead ends: 641 [2020-07-20 16:56:58,139 INFO L226 Difference]: Without dead ends: 336 [2020-07-20 16:56:58,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 513 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=252, Invalid=1154, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 16:56:58,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2020-07-20 16:56:58,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 275. [2020-07-20 16:56:58,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 275 states. [2020-07-20 16:56:58,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 454 transitions. [2020-07-20 16:56:58,167 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 454 transitions. Word has length 276 [2020-07-20 16:56:58,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:58,168 INFO L479 AbstractCegarLoop]: Abstraction has 275 states and 454 transitions. [2020-07-20 16:56:58,168 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:56:58,168 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 454 transitions. [2020-07-20 16:56:58,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-20 16:56:58,171 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:58,171 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 16, 16, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:58,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:58,386 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:58,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:58,386 INFO L82 PathProgramCache]: Analyzing trace with hash -1017700382, now seen corresponding path program 21 times [2020-07-20 16:56:58,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:58,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504141150] [2020-07-20 16:56:58,386 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:56:58,675 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:58,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:58,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:58,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:58,809 INFO L134 CoverageAnalysis]: Checked inductivity of 1510 backedges. 103 proven. 280 refuted. 0 times theorem prover too weak. 1127 trivial. 0 not checked. [2020-07-20 16:56:58,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:59,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:59,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:59,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:59,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:00,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:00,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:00,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:00,259 INFO L134 CoverageAnalysis]: Checked inductivity of 1510 backedges. 103 proven. 290 refuted. 0 times theorem prover too weak. 1117 trivial. 0 not checked. [2020-07-20 16:57:00,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504141150] [2020-07-20 16:57:00,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:00,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:57:00,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200946024] [2020-07-20 16:57:00,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:57:00,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:00,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:57:00,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:57:00,261 INFO L87 Difference]: Start difference. First operand 275 states and 454 transitions. Second operand 16 states. [2020-07-20 16:57:00,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:00,491 INFO L93 Difference]: Finished difference Result 310 states and 520 transitions. [2020-07-20 16:57:00,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:57:00,492 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 237 [2020-07-20 16:57:00,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:00,495 INFO L225 Difference]: With dead ends: 310 [2020-07-20 16:57:00,495 INFO L226 Difference]: Without dead ends: 306 [2020-07-20 16:57:00,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 449 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:57:00,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-20 16:57:00,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 270. [2020-07-20 16:57:00,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-20 16:57:00,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 446 transitions. [2020-07-20 16:57:00,512 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 446 transitions. Word has length 237 [2020-07-20 16:57:00,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:00,512 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 446 transitions. [2020-07-20 16:57:00,512 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:57:00,512 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 446 transitions. [2020-07-20 16:57:00,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-20 16:57:00,515 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:00,515 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:00,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:00,731 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:00,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:00,732 INFO L82 PathProgramCache]: Analyzing trace with hash 1937889483, now seen corresponding path program 22 times [2020-07-20 16:57:00,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:00,732 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541463072] [2020-07-20 16:57:00,732 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:57:01,032 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:01,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:01,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:57:01,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:01,119 INFO L134 CoverageAnalysis]: Checked inductivity of 1674 backedges. 312 proven. 91 refuted. 0 times theorem prover too weak. 1271 trivial. 0 not checked. [2020-07-20 16:57:01,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:01,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:01,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:02,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:02,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:02,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:02,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:02,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:02,612 INFO L134 CoverageAnalysis]: Checked inductivity of 1674 backedges. 314 proven. 99 refuted. 0 times theorem prover too weak. 1261 trivial. 0 not checked. [2020-07-20 16:57:02,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541463072] [2020-07-20 16:57:02,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:02,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:57:02,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898341851] [2020-07-20 16:57:02,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:57:02,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:02,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:57:02,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:57:02,614 INFO L87 Difference]: Start difference. First operand 270 states and 446 transitions. Second operand 16 states. [2020-07-20 16:57:02,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:02,828 INFO L93 Difference]: Finished difference Result 295 states and 512 transitions. [2020-07-20 16:57:02,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:57:02,829 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 249 [2020-07-20 16:57:02,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:02,832 INFO L225 Difference]: With dead ends: 295 [2020-07-20 16:57:02,832 INFO L226 Difference]: Without dead ends: 291 [2020-07-20 16:57:02,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 474 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:57:02,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2020-07-20 16:57:02,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 283. [2020-07-20 16:57:02,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 283 states. [2020-07-20 16:57:02,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 493 transitions. [2020-07-20 16:57:02,850 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 493 transitions. Word has length 249 [2020-07-20 16:57:02,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:02,850 INFO L479 AbstractCegarLoop]: Abstraction has 283 states and 493 transitions. [2020-07-20 16:57:02,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:57:02,851 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 493 transitions. [2020-07-20 16:57:02,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-20 16:57:02,853 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:02,854 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] [2020-07-20 16:57:03,066 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:03,067 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:03,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:03,068 INFO L82 PathProgramCache]: Analyzing trace with hash -1057498309, now seen corresponding path program 5 times [2020-07-20 16:57:03,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:03,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600318357] [2020-07-20 16:57:03,068 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:57:03,374 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:03,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:03,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:57:03,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:03,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1686 backedges. 86 proven. 445 refuted. 0 times theorem prover too weak. 1155 trivial. 0 not checked. [2020-07-20 16:57:03,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:05,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:05,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:06,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:06,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:06,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:06,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:06,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:06,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1686 backedges. 86 proven. 466 refuted. 0 times theorem prover too weak. 1134 trivial. 0 not checked. [2020-07-20 16:57:06,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600318357] [2020-07-20 16:57:06,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:06,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:57:06,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809199407] [2020-07-20 16:57:06,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:57:06,297 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:06,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:57:06,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:57:06,297 INFO L87 Difference]: Start difference. First operand 283 states and 493 transitions. Second operand 20 states. [2020-07-20 16:57:06,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:06,609 INFO L93 Difference]: Finished difference Result 303 states and 533 transitions. [2020-07-20 16:57:06,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:57:06,610 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 249 [2020-07-20 16:57:06,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:06,613 INFO L225 Difference]: With dead ends: 303 [2020-07-20 16:57:06,613 INFO L226 Difference]: Without dead ends: 299 [2020-07-20 16:57:06,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 466 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:57:06,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2020-07-20 16:57:06,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 283. [2020-07-20 16:57:06,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 283 states. [2020-07-20 16:57:06,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 493 transitions. [2020-07-20 16:57:06,631 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 493 transitions. Word has length 249 [2020-07-20 16:57:06,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:06,631 INFO L479 AbstractCegarLoop]: Abstraction has 283 states and 493 transitions. [2020-07-20 16:57:06,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:57:06,631 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 493 transitions. [2020-07-20 16:57:06,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2020-07-20 16:57:06,635 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:06,635 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 17, 17, 13, 12, 10, 10, 10, 10, 10, 10, 10, 8, 8, 8, 8, 8, 8, 8, 7, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:06,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:06,849 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:06,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:06,849 INFO L82 PathProgramCache]: Analyzing trace with hash -342934213, now seen corresponding path program 23 times [2020-07-20 16:57:06,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:06,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033588126] [2020-07-20 16:57:06,850 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:57:07,170 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:07,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:07,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:57:07,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:07,304 INFO L134 CoverageAnalysis]: Checked inductivity of 1740 backedges. 972 proven. 175 refuted. 0 times theorem prover too weak. 593 trivial. 0 not checked. [2020-07-20 16:57:07,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:08,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:08,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:08,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:09,416 INFO L134 CoverageAnalysis]: Checked inductivity of 1740 backedges. 251 proven. 393 refuted. 0 times theorem prover too weak. 1096 trivial. 0 not checked. [2020-07-20 16:57:09,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033588126] [2020-07-20 16:57:09,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:09,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:57:09,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363437430] [2020-07-20 16:57:09,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:57:09,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:09,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:57:09,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:57:09,419 INFO L87 Difference]: Start difference. First operand 283 states and 493 transitions. Second operand 21 states. [2020-07-20 16:57:10,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:10,179 INFO L93 Difference]: Finished difference Result 589 states and 1044 transitions. [2020-07-20 16:57:10,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 16:57:10,180 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 254 [2020-07-20 16:57:10,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:10,183 INFO L225 Difference]: With dead ends: 589 [2020-07-20 16:57:10,184 INFO L226 Difference]: Without dead ends: 308 [2020-07-20 16:57:10,186 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 520 GetRequests, 473 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=193, Invalid=929, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 16:57:10,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2020-07-20 16:57:10,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 284. [2020-07-20 16:57:10,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-20 16:57:10,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 481 transitions. [2020-07-20 16:57:10,203 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 481 transitions. Word has length 254 [2020-07-20 16:57:10,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:10,204 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 481 transitions. [2020-07-20 16:57:10,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:57:10,204 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 481 transitions. [2020-07-20 16:57:10,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-07-20 16:57:10,207 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:10,207 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 14, 14, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:10,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:10,423 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:10,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:10,423 INFO L82 PathProgramCache]: Analyzing trace with hash 150178188, now seen corresponding path program 24 times [2020-07-20 16:57:10,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:10,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1910665982] [2020-07-20 16:57:10,423 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:57:10,777 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:10,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:10,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:57:10,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:11,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1950 backedges. 383 proven. 521 refuted. 0 times theorem prover too weak. 1046 trivial. 0 not checked. [2020-07-20 16:57:11,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:12,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:12,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:12,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:13,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:15,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1950 backedges. 383 proven. 545 refuted. 0 times theorem prover too weak. 1022 trivial. 0 not checked. [2020-07-20 16:57:15,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1910665982] [2020-07-20 16:57:15,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:15,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-20 16:57:15,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275972181] [2020-07-20 16:57:15,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:57:15,029 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:15,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:57:15,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:57:15,029 INFO L87 Difference]: Start difference. First operand 284 states and 481 transitions. Second operand 29 states. [2020-07-20 16:57:16,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:16,411 INFO L93 Difference]: Finished difference Result 594 states and 1074 transitions. [2020-07-20 16:57:16,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 16:57:16,412 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 269 [2020-07-20 16:57:16,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:16,415 INFO L225 Difference]: With dead ends: 594 [2020-07-20 16:57:16,416 INFO L226 Difference]: Without dead ends: 312 [2020-07-20 16:57:16,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 487 SyntacticMatches, 23 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=373, Invalid=1979, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 16:57:16,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2020-07-20 16:57:16,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 279. [2020-07-20 16:57:16,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 279 states. [2020-07-20 16:57:16,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 443 transitions. [2020-07-20 16:57:16,435 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 443 transitions. Word has length 269 [2020-07-20 16:57:16,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:16,435 INFO L479 AbstractCegarLoop]: Abstraction has 279 states and 443 transitions. [2020-07-20 16:57:16,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:57:16,435 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 443 transitions. [2020-07-20 16:57:16,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 761 [2020-07-20 16:57:16,442 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:16,443 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 53, 53, 38, 37, 30, 30, 30, 30, 30, 30, 30, 26, 26, 26, 26, 26, 26, 26, 22, 16, 12, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:16,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:16,656 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:16,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:16,657 INFO L82 PathProgramCache]: Analyzing trace with hash -1350974591, now seen corresponding path program 25 times [2020-07-20 16:57:16,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:16,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1903583500] [2020-07-20 16:57:16,658 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:57:17,071 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:57:17,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:17,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:57:17,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:17,464 INFO L134 CoverageAnalysis]: Checked inductivity of 17001 backedges. 8712 proven. 751 refuted. 0 times theorem prover too weak. 7538 trivial. 0 not checked. [2020-07-20 16:57:17,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:21,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:21,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:21,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:22,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:22,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:22,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:22,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:23,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:23,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:23,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:23,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:23,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:23,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:23,686 INFO L134 CoverageAnalysis]: Checked inductivity of 17001 backedges. 486 proven. 2594 refuted. 0 times theorem prover too weak. 13921 trivial. 0 not checked. [2020-07-20 16:57:23,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1903583500] [2020-07-20 16:57:23,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:23,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 29 [2020-07-20 16:57:23,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155112334] [2020-07-20 16:57:23,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:57:23,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:23,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:57:23,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=716, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:57:23,689 INFO L87 Difference]: Start difference. First operand 279 states and 443 transitions. Second operand 29 states. [2020-07-20 16:57:25,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:25,300 INFO L93 Difference]: Finished difference Result 644 states and 1115 transitions. [2020-07-20 16:57:25,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 16:57:25,301 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 760 [2020-07-20 16:57:25,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:25,304 INFO L225 Difference]: With dead ends: 644 [2020-07-20 16:57:25,304 INFO L226 Difference]: Without dead ends: 371 [2020-07-20 16:57:25,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1544 GetRequests, 1473 SyntacticMatches, 19 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=460, Invalid=2402, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 16:57:25,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2020-07-20 16:57:25,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 315. [2020-07-20 16:57:25,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 315 states. [2020-07-20 16:57:25,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 526 transitions. [2020-07-20 16:57:25,328 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 526 transitions. Word has length 760 [2020-07-20 16:57:25,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:25,330 INFO L479 AbstractCegarLoop]: Abstraction has 315 states and 526 transitions. [2020-07-20 16:57:25,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:57:25,330 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 526 transitions. [2020-07-20 16:57:25,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 471 [2020-07-20 16:57:25,334 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:25,334 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 25, 24, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 12, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:25,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:25,539 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:25,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:25,540 INFO L82 PathProgramCache]: Analyzing trace with hash 554303275, now seen corresponding path program 26 times [2020-07-20 16:57:25,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:25,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1288591296] [2020-07-20 16:57:25,540 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:57:25,985 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:25,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:25,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:57:25,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:26,330 INFO L134 CoverageAnalysis]: Checked inductivity of 6300 backedges. 708 proven. 1267 refuted. 0 times theorem prover too weak. 4325 trivial. 0 not checked. [2020-07-20 16:57:26,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:28,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:29,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:31,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:31,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:31,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:32,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:32,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:32,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:32,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:32,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:32,425 INFO L134 CoverageAnalysis]: Checked inductivity of 6300 backedges. 710 proven. 1297 refuted. 0 times theorem prover too weak. 4293 trivial. 0 not checked. [2020-07-20 16:57:32,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1288591296] [2020-07-20 16:57:32,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:32,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 33 [2020-07-20 16:57:32,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877391346] [2020-07-20 16:57:32,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 16:57:32,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:32,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 16:57:32,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:57:32,428 INFO L87 Difference]: Start difference. First operand 315 states and 526 transitions. Second operand 33 states. [2020-07-20 16:57:34,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:34,722 INFO L93 Difference]: Finished difference Result 764 states and 1431 transitions. [2020-07-20 16:57:34,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 16:57:34,730 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 470 [2020-07-20 16:57:34,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:34,737 INFO L225 Difference]: With dead ends: 764 [2020-07-20 16:57:34,737 INFO L226 Difference]: Without dead ends: 449 [2020-07-20 16:57:34,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 885 SyntacticMatches, 23 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 787 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=591, Invalid=3191, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 16:57:34,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2020-07-20 16:57:34,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 300. [2020-07-20 16:57:34,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-20 16:57:34,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 497 transitions. [2020-07-20 16:57:34,763 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 497 transitions. Word has length 470 [2020-07-20 16:57:34,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:34,764 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 497 transitions. [2020-07-20 16:57:34,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 16:57:34,764 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 497 transitions. [2020-07-20 16:57:34,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 379 [2020-07-20 16:57:34,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:34,768 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 25, 25, 21, 20, 15, 15, 15, 15, 15, 15, 15, 12, 12, 12, 12, 12, 12, 12, 10, 8, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:34,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:34,983 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:34,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:34,984 INFO L82 PathProgramCache]: Analyzing trace with hash 835126126, now seen corresponding path program 27 times [2020-07-20 16:57:34,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:34,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [63963836] [2020-07-20 16:57:34,984 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:57:35,480 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:35,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:35,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:57:35,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:35,749 INFO L134 CoverageAnalysis]: Checked inductivity of 4024 backedges. 597 proven. 821 refuted. 0 times theorem prover too weak. 2606 trivial. 0 not checked. [2020-07-20 16:57:35,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:38,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:38,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:38,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:38,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:38,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:38,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:38,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:38,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:39,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:39,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:40,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:40,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:40,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:40,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:40,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:40,648 INFO L134 CoverageAnalysis]: Checked inductivity of 4024 backedges. 597 proven. 847 refuted. 0 times theorem prover too weak. 2580 trivial. 0 not checked. [2020-07-20 16:57:40,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [63963836] [2020-07-20 16:57:40,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:40,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-20 16:57:40,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599369350] [2020-07-20 16:57:40,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:57:40,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:40,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:57:40,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:57:40,650 INFO L87 Difference]: Start difference. First operand 300 states and 497 transitions. Second operand 29 states. [2020-07-20 16:57:42,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:42,802 INFO L93 Difference]: Finished difference Result 745 states and 1331 transitions. [2020-07-20 16:57:42,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 16:57:42,804 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 378 [2020-07-20 16:57:42,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:42,810 INFO L225 Difference]: With dead ends: 745 [2020-07-20 16:57:42,810 INFO L226 Difference]: Without dead ends: 440 [2020-07-20 16:57:42,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 781 GetRequests, 705 SyntacticMatches, 23 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 602 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=472, Invalid=2498, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 16:57:42,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2020-07-20 16:57:42,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 378. [2020-07-20 16:57:42,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 378 states. [2020-07-20 16:57:42,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 658 transitions. [2020-07-20 16:57:42,840 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 658 transitions. Word has length 378 [2020-07-20 16:57:42,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:42,840 INFO L479 AbstractCegarLoop]: Abstraction has 378 states and 658 transitions. [2020-07-20 16:57:42,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:57:42,841 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 658 transitions. [2020-07-20 16:57:42,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-20 16:57:42,844 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:42,845 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] [2020-07-20 16:57:43,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:43,059 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:43,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:43,060 INFO L82 PathProgramCache]: Analyzing trace with hash -1449609713, now seen corresponding path program 28 times [2020-07-20 16:57:43,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:43,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1744842808] [2020-07-20 16:57:43,060 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:57:43,551 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:43,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:43,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:57:43,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:43,768 INFO L134 CoverageAnalysis]: Checked inductivity of 2644 backedges. 140 proven. 488 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2020-07-20 16:57:43,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:45,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:45,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:45,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:45,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:46,437 INFO L134 CoverageAnalysis]: Checked inductivity of 2644 backedges. 140 proven. 504 refuted. 0 times theorem prover too weak. 2000 trivial. 0 not checked. [2020-07-20 16:57:46,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1744842808] [2020-07-20 16:57:46,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:46,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 16:57:46,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497922376] [2020-07-20 16:57:46,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:57:46,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:46,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:57:46,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:57:46,439 INFO L87 Difference]: Start difference. First operand 378 states and 658 transitions. Second operand 17 states. [2020-07-20 16:57:46,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:46,794 INFO L93 Difference]: Finished difference Result 385 states and 668 transitions. [2020-07-20 16:57:46,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:57:46,796 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 310 [2020-07-20 16:57:46,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:46,800 INFO L225 Difference]: With dead ends: 385 [2020-07-20 16:57:46,800 INFO L226 Difference]: Without dead ends: 381 [2020-07-20 16:57:46,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 625 GetRequests, 591 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:57:46,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 381 states. [2020-07-20 16:57:46,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 381 to 378. [2020-07-20 16:57:46,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 378 states. [2020-07-20 16:57:46,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 658 transitions. [2020-07-20 16:57:46,825 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 658 transitions. Word has length 310 [2020-07-20 16:57:46,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:46,826 INFO L479 AbstractCegarLoop]: Abstraction has 378 states and 658 transitions. [2020-07-20 16:57:46,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:57:46,826 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 658 transitions. [2020-07-20 16:57:46,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 379 [2020-07-20 16:57:46,830 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:46,831 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 21, 20, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 8, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:47,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:47,046 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:47,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:47,047 INFO L82 PathProgramCache]: Analyzing trace with hash 1636633566, now seen corresponding path program 29 times [2020-07-20 16:57:47,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:47,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [110227492] [2020-07-20 16:57:47,047 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:57:47,604 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:47,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:47,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:57:47,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:48,004 INFO L134 CoverageAnalysis]: Checked inductivity of 3992 backedges. 560 proven. 955 refuted. 0 times theorem prover too weak. 2477 trivial. 0 not checked. [2020-07-20 16:57:48,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:50,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:50,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:50,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:50,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:51,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:51,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:51,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:51,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:51,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:52,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:52,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:53,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:53,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:53,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:53,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:53,873 INFO L134 CoverageAnalysis]: Checked inductivity of 3992 backedges. 560 proven. 987 refuted. 0 times theorem prover too weak. 2445 trivial. 0 not checked. [2020-07-20 16:57:53,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [110227492] [2020-07-20 16:57:53,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:53,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-20 16:57:53,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484617205] [2020-07-20 16:57:53,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:57:53,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:53,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:57:53,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:57:53,875 INFO L87 Difference]: Start difference. First operand 378 states and 658 transitions. Second operand 31 states. [2020-07-20 16:57:56,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:56,193 INFO L93 Difference]: Finished difference Result 921 states and 1667 transitions. [2020-07-20 16:57:56,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 16:57:56,194 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 378 [2020-07-20 16:57:56,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:56,200 INFO L225 Difference]: With dead ends: 921 [2020-07-20 16:57:56,200 INFO L226 Difference]: Without dead ends: 548 [2020-07-20 16:57:56,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 784 GetRequests, 701 SyntacticMatches, 25 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 753 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=554, Invalid=2986, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 16:57:56,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2020-07-20 16:57:56,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 392. [2020-07-20 16:57:56,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 392 states. [2020-07-20 16:57:56,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 687 transitions. [2020-07-20 16:57:56,228 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 687 transitions. Word has length 378 [2020-07-20 16:57:56,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:56,228 INFO L479 AbstractCegarLoop]: Abstraction has 392 states and 687 transitions. [2020-07-20 16:57:56,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:57:56,229 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 687 transitions. [2020-07-20 16:57:56,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-20 16:57:56,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:56,234 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 17, 16, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:56,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:56,448 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:56,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:56,449 INFO L82 PathProgramCache]: Analyzing trace with hash -1297703331, now seen corresponding path program 30 times [2020-07-20 16:57:56,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:56,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370019621] [2020-07-20 16:57:56,449 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:57:56,993 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:56,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:56,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:57:57,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:57,146 INFO L134 CoverageAnalysis]: Checked inductivity of 3088 backedges. 124 proven. 660 refuted. 0 times theorem prover too weak. 2304 trivial. 0 not checked. [2020-07-20 16:57:57,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:59,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:59,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:01,031 INFO L134 CoverageAnalysis]: Checked inductivity of 3088 backedges. 124 proven. 684 refuted. 0 times theorem prover too weak. 2280 trivial. 0 not checked. [2020-07-20 16:58:01,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370019621] [2020-07-20 16:58:01,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:01,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 16:58:01,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088709364] [2020-07-20 16:58:01,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:58:01,033 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:01,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:58:01,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:58:01,034 INFO L87 Difference]: Start difference. First operand 392 states and 687 transitions. Second operand 19 states. [2020-07-20 16:58:01,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:01,430 INFO L93 Difference]: Finished difference Result 404 states and 707 transitions. [2020-07-20 16:58:01,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:58:01,431 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 334 [2020-07-20 16:58:01,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:01,437 INFO L225 Difference]: With dead ends: 404 [2020-07-20 16:58:01,437 INFO L226 Difference]: Without dead ends: 400 [2020-07-20 16:58:01,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 635 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:58:01,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2020-07-20 16:58:01,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 387. [2020-07-20 16:58:01,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 387 states. [2020-07-20 16:58:01,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 675 transitions. [2020-07-20 16:58:01,458 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 675 transitions. Word has length 334 [2020-07-20 16:58:01,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:01,459 INFO L479 AbstractCegarLoop]: Abstraction has 387 states and 675 transitions. [2020-07-20 16:58:01,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:58:01,459 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 675 transitions. [2020-07-20 16:58:01,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2020-07-20 16:58:01,463 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:01,464 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] [2020-07-20 16:58:01,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:01,669 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:01,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:01,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1063792051, now seen corresponding path program 31 times [2020-07-20 16:58:01,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:01,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [106494590] [2020-07-20 16:58:01,671 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:58:02,235 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:58:02,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:02,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 693 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:58:02,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:02,382 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 185 proven. 551 refuted. 0 times theorem prover too weak. 2848 trivial. 0 not checked. [2020-07-20 16:58:02,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:04,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:04,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:04,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:05,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:05,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:05,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:05,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:05,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:05,584 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 185 proven. 567 refuted. 0 times theorem prover too weak. 2832 trivial. 0 not checked. [2020-07-20 16:58:05,584 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [106494590] [2020-07-20 16:58:05,584 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:05,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 16:58:05,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378118319] [2020-07-20 16:58:05,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:58:05,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:05,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:58:05,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:58:05,586 INFO L87 Difference]: Start difference. First operand 387 states and 675 transitions. Second operand 17 states. [2020-07-20 16:58:05,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:05,957 INFO L93 Difference]: Finished difference Result 470 states and 859 transitions. [2020-07-20 16:58:05,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:58:05,959 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 358 [2020-07-20 16:58:05,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:05,965 INFO L225 Difference]: With dead ends: 470 [2020-07-20 16:58:05,965 INFO L226 Difference]: Without dead ends: 466 [2020-07-20 16:58:05,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 721 GetRequests, 687 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:58:05,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2020-07-20 16:58:05,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 402. [2020-07-20 16:58:05,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 402 states. [2020-07-20 16:58:05,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 712 transitions. [2020-07-20 16:58:05,988 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 712 transitions. Word has length 358 [2020-07-20 16:58:05,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:05,989 INFO L479 AbstractCegarLoop]: Abstraction has 402 states and 712 transitions. [2020-07-20 16:58:05,989 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:58:05,989 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 712 transitions. [2020-07-20 16:58:05,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2020-07-20 16:58:05,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:05,993 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 21, 20, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 10, 10, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:06,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:06,194 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:06,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:06,195 INFO L82 PathProgramCache]: Analyzing trace with hash -431979357, now seen corresponding path program 32 times [2020-07-20 16:58:06,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:06,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [353997757] [2020-07-20 16:58:06,196 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:58:06,769 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:58:06,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:06,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:58:06,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:07,147 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 763 proven. 817 refuted. 0 times theorem prover too weak. 3260 trivial. 0 not checked. [2020-07-20 16:58:07,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:09,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:09,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:10,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:10,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:10,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:10,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:10,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:11,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:12,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:12,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:12,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:12,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:12,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:12,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:12,795 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 765 proven. 841 refuted. 0 times theorem prover too weak. 3234 trivial. 0 not checked. [2020-07-20 16:58:12,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [353997757] [2020-07-20 16:58:12,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:12,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-20 16:58:12,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821782356] [2020-07-20 16:58:12,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:58:12,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:12,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:58:12,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:58:12,797 INFO L87 Difference]: Start difference. First operand 402 states and 712 transitions. Second operand 29 states. [2020-07-20 16:58:15,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:15,074 INFO L93 Difference]: Finished difference Result 967 states and 1779 transitions. [2020-07-20 16:58:15,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-20 16:58:15,077 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 414 [2020-07-20 16:58:15,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:15,085 INFO L225 Difference]: With dead ends: 967 [2020-07-20 16:58:15,086 INFO L226 Difference]: Without dead ends: 559 [2020-07-20 16:58:15,089 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 854 GetRequests, 777 SyntacticMatches, 23 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 631 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=479, Invalid=2601, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 16:58:15,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 559 states. [2020-07-20 16:58:15,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 559 to 397. [2020-07-20 16:58:15,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 397 states. [2020-07-20 16:58:15,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 698 transitions. [2020-07-20 16:58:15,119 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 698 transitions. Word has length 414 [2020-07-20 16:58:15,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:15,119 INFO L479 AbstractCegarLoop]: Abstraction has 397 states and 698 transitions. [2020-07-20 16:58:15,119 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:58:15,120 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 698 transitions. [2020-07-20 16:58:15,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2020-07-20 16:58:15,124 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:15,124 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] [2020-07-20 16:58:15,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:15,338 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:15,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:15,339 INFO L82 PathProgramCache]: Analyzing trace with hash -884966346, now seen corresponding path program 33 times [2020-07-20 16:58:15,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:15,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1844839605] [2020-07-20 16:58:15,340 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:58:15,947 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:58:15,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:15,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:58:15,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:16,099 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 247 proven. 519 refuted. 0 times theorem prover too weak. 3082 trivial. 0 not checked. [2020-07-20 16:58:16,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:18,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:18,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:18,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:18,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:18,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:18,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:18,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:19,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:19,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:19,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:19,478 INFO L134 CoverageAnalysis]: Checked inductivity of 3848 backedges. 249 proven. 533 refuted. 0 times theorem prover too weak. 3066 trivial. 0 not checked. [2020-07-20 16:58:19,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1844839605] [2020-07-20 16:58:19,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:19,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 16:58:19,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319706383] [2020-07-20 16:58:19,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:58:19,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:19,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:58:19,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:58:19,480 INFO L87 Difference]: Start difference. First operand 397 states and 698 transitions. Second operand 17 states. [2020-07-20 16:58:19,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:19,840 INFO L93 Difference]: Finished difference Result 413 states and 724 transitions. [2020-07-20 16:58:19,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:58:19,841 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 370 [2020-07-20 16:58:19,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:19,847 INFO L225 Difference]: With dead ends: 413 [2020-07-20 16:58:19,847 INFO L226 Difference]: Without dead ends: 409 [2020-07-20 16:58:19,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 745 GetRequests, 711 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:58:19,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2020-07-20 16:58:19,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 377. [2020-07-20 16:58:19,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2020-07-20 16:58:19,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 652 transitions. [2020-07-20 16:58:19,869 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 652 transitions. Word has length 370 [2020-07-20 16:58:19,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:19,869 INFO L479 AbstractCegarLoop]: Abstraction has 377 states and 652 transitions. [2020-07-20 16:58:19,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:58:19,870 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 652 transitions. [2020-07-20 16:58:19,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 427 [2020-07-20 16:58:19,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:19,875 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 21, 20, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 12, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:20,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:20,089 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:20,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:20,090 INFO L82 PathProgramCache]: Analyzing trace with hash 174766876, now seen corresponding path program 34 times [2020-07-20 16:58:20,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:20,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1569554245] [2020-07-20 16:58:20,091 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:58:20,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:58:20,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:20,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:58:20,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:21,019 INFO L134 CoverageAnalysis]: Checked inductivity of 5144 backedges. 2811 proven. 529 refuted. 0 times theorem prover too weak. 1804 trivial. 0 not checked. [2020-07-20 16:58:21,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:24,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:25,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:25,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:25,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:25,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:26,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:26,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:27,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:27,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:27,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:27,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:27,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:27,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:27,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:27,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:28,093 INFO L134 CoverageAnalysis]: Checked inductivity of 5144 backedges. 540 proven. 1185 refuted. 0 times theorem prover too weak. 3419 trivial. 0 not checked. [2020-07-20 16:58:28,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1569554245] [2020-07-20 16:58:28,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:28,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-20 16:58:28,094 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148675792] [2020-07-20 16:58:28,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:58:28,095 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:28,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:58:28,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:58:28,096 INFO L87 Difference]: Start difference. First operand 377 states and 652 transitions. Second operand 29 states. [2020-07-20 16:58:30,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:30,001 INFO L93 Difference]: Finished difference Result 795 states and 1483 transitions. [2020-07-20 16:58:30,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 16:58:30,003 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 426 [2020-07-20 16:58:30,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:30,008 INFO L225 Difference]: With dead ends: 795 [2020-07-20 16:58:30,009 INFO L226 Difference]: Without dead ends: 423 [2020-07-20 16:58:30,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 871 GetRequests, 801 SyntacticMatches, 23 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=373, Invalid=1979, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 16:58:30,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2020-07-20 16:58:30,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 386. [2020-07-20 16:58:30,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 386 states. [2020-07-20 16:58:30,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 685 transitions. [2020-07-20 16:58:30,033 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 685 transitions. Word has length 426 [2020-07-20 16:58:30,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:30,033 INFO L479 AbstractCegarLoop]: Abstraction has 386 states and 685 transitions. [2020-07-20 16:58:30,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:58:30,033 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 685 transitions. [2020-07-20 16:58:30,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 669 [2020-07-20 16:58:30,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:30,040 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 48, 48, 34, 33, 25, 25, 25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 24, 24, 18, 14, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:30,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:30,241 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:30,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:30,242 INFO L82 PathProgramCache]: Analyzing trace with hash 699623040, now seen corresponding path program 35 times [2020-07-20 16:58:30,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:30,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792737959] [2020-07-20 16:58:30,243 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:58:30,999 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:58:31,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:31,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 987 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 16:58:31,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:31,472 INFO L134 CoverageAnalysis]: Checked inductivity of 13005 backedges. 1082 proven. 2122 refuted. 0 times theorem prover too weak. 9801 trivial. 0 not checked. [2020-07-20 16:58:31,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:35,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:36,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:36,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:36,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:36,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:36,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:36,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:36,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:39,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:40,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:40,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:40,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:40,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:40,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:41,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:41,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:41,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:41,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:41,505 INFO L134 CoverageAnalysis]: Checked inductivity of 13005 backedges. 1084 proven. 2160 refuted. 0 times theorem prover too weak. 9761 trivial. 0 not checked. [2020-07-20 16:58:41,506 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792737959] [2020-07-20 16:58:41,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:41,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-20 16:58:41,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339656608] [2020-07-20 16:58:41,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 16:58:41,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:41,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 16:58:41,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:58:41,508 INFO L87 Difference]: Start difference. First operand 386 states and 685 transitions. Second operand 33 states. [2020-07-20 16:58:44,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:44,615 INFO L93 Difference]: Finished difference Result 987 states and 1964 transitions. [2020-07-20 16:58:44,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 16:58:44,618 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 668 [2020-07-20 16:58:44,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:44,627 INFO L225 Difference]: With dead ends: 987 [2020-07-20 16:58:44,627 INFO L226 Difference]: Without dead ends: 545 [2020-07-20 16:58:44,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1365 GetRequests, 1277 SyntacticMatches, 27 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 841 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=595, Invalid=3311, Unknown=0, NotChecked=0, Total=3906 [2020-07-20 16:58:44,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 545 states. [2020-07-20 16:58:44,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 545 to 452. [2020-07-20 16:58:44,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 452 states. [2020-07-20 16:58:44,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 861 transitions. [2020-07-20 16:58:44,662 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 861 transitions. Word has length 668 [2020-07-20 16:58:44,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:44,662 INFO L479 AbstractCegarLoop]: Abstraction has 452 states and 861 transitions. [2020-07-20 16:58:44,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 16:58:44,662 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 861 transitions. [2020-07-20 16:58:44,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-20 16:58:44,667 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:44,667 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 31, 31, 23, 23, 20, 20, 20, 20, 20, 20, 20, 17, 15, 15, 15, 15, 15, 15, 15, 8, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:44,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:44,868 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:44,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:44,869 INFO L82 PathProgramCache]: Analyzing trace with hash 878083086, now seen corresponding path program 36 times [2020-07-20 16:58:44,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:44,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880378021] [2020-07-20 16:58:44,870 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:58:45,585 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:58:45,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:45,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 711 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:58:45,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:45,998 INFO L134 CoverageAnalysis]: Checked inductivity of 6666 backedges. 907 proven. 976 refuted. 0 times theorem prover too weak. 4783 trivial. 0 not checked. [2020-07-20 16:58:45,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:58:48,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:48,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:48,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:48,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:49,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:49,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:51,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:51,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:51,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:52,905 INFO L134 CoverageAnalysis]: Checked inductivity of 6666 backedges. 911 proven. 998 refuted. 0 times theorem prover too weak. 4757 trivial. 0 not checked. [2020-07-20 16:58:52,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880378021] [2020-07-20 16:58:52,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:52,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-20 16:58:52,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708221573] [2020-07-20 16:58:52,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:58:52,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:52,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:58:52,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:58:52,907 INFO L87 Difference]: Start difference. First operand 452 states and 861 transitions. Second operand 29 states. [2020-07-20 16:58:54,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:58:54,978 INFO L93 Difference]: Finished difference Result 951 states and 1816 transitions. [2020-07-20 16:58:54,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 16:58:54,987 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 479 [2020-07-20 16:58:54,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:58:54,995 INFO L225 Difference]: With dead ends: 951 [2020-07-20 16:58:54,995 INFO L226 Difference]: Without dead ends: 501 [2020-07-20 16:58:54,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 907 SyntacticMatches, 23 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=400, Invalid=2150, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 16:58:55,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2020-07-20 16:58:55,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 456. [2020-07-20 16:58:55,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 456 states. [2020-07-20 16:58:55,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 847 transitions. [2020-07-20 16:58:55,038 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 847 transitions. Word has length 479 [2020-07-20 16:58:55,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:58:55,039 INFO L479 AbstractCegarLoop]: Abstraction has 456 states and 847 transitions. [2020-07-20 16:58:55,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:58:55,039 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 847 transitions. [2020-07-20 16:58:55,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 657 [2020-07-20 16:58:55,048 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:58:55,048 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 45, 45, 34, 33, 26, 26, 26, 26, 26, 26, 26, 22, 22, 22, 22, 22, 22, 22, 18, 12, 12, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:58:55,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:58:55,264 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:58:55,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:58:55,264 INFO L82 PathProgramCache]: Analyzing trace with hash -1182380235, now seen corresponding path program 37 times [2020-07-20 16:58:55,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:58:55,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1740087696] [2020-07-20 16:58:55,265 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:58:56,103 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:58:56,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:58:56,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 972 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:58:56,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:58:56,742 INFO L134 CoverageAnalysis]: Checked inductivity of 12577 backedges. 1125 proven. 1782 refuted. 0 times theorem prover too weak. 9670 trivial. 0 not checked. [2020-07-20 16:58:56,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:59:00,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:00,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:01,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:01,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:01,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:01,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:01,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:01,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:01,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:04,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:04,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:04,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:05,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:05,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:05,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:05,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:05,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:05,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:05,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:05,713 INFO L134 CoverageAnalysis]: Checked inductivity of 12577 backedges. 1129 proven. 1810 refuted. 0 times theorem prover too weak. 9638 trivial. 0 not checked. [2020-07-20 16:59:05,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1740087696] [2020-07-20 16:59:05,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:59:05,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-20 16:59:05,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049618213] [2020-07-20 16:59:05,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:59:05,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:59:05,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:59:05,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:59:05,715 INFO L87 Difference]: Start difference. First operand 456 states and 847 transitions. Second operand 31 states. [2020-07-20 16:59:08,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:59:08,320 INFO L93 Difference]: Finished difference Result 1121 states and 2303 transitions. [2020-07-20 16:59:08,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 16:59:08,321 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 656 [2020-07-20 16:59:08,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:59:08,330 INFO L225 Difference]: With dead ends: 1121 [2020-07-20 16:59:08,330 INFO L226 Difference]: Without dead ends: 655 [2020-07-20 16:59:08,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1340 GetRequests, 1257 SyntacticMatches, 25 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 748 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=554, Invalid=2986, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 16:59:08,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 655 states. [2020-07-20 16:59:08,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 655 to 502. [2020-07-20 16:59:08,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 502 states. [2020-07-20 16:59:08,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 948 transitions. [2020-07-20 16:59:08,364 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 948 transitions. Word has length 656 [2020-07-20 16:59:08,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:59:08,365 INFO L479 AbstractCegarLoop]: Abstraction has 502 states and 948 transitions. [2020-07-20 16:59:08,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:59:08,365 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 948 transitions. [2020-07-20 16:59:08,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 548 [2020-07-20 16:59:08,370 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:59:08,370 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 35, 35, 27, 27, 23, 23, 23, 23, 23, 23, 23, 19, 17, 17, 17, 17, 17, 17, 17, 10, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:59:08,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:08,571 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:59:08,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:59:08,572 INFO L82 PathProgramCache]: Analyzing trace with hash -910698245, now seen corresponding path program 38 times [2020-07-20 16:59:08,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:59:08,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [594160892] [2020-07-20 16:59:08,573 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:59:09,383 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:59:09,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:59:09,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 16:59:09,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:59:09,683 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 1732 proven. 11 refuted. 0 times theorem prover too weak. 7035 trivial. 0 not checked. [2020-07-20 16:59:09,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:59:13,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:13,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:14,015 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 303 proven. 986 refuted. 0 times theorem prover too weak. 7489 trivial. 0 not checked. [2020-07-20 16:59:14,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [594160892] [2020-07-20 16:59:14,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:59:14,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-20 16:59:14,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869874996] [2020-07-20 16:59:14,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:59:14,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:59:14,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:59:14,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:59:14,018 INFO L87 Difference]: Start difference. First operand 502 states and 948 transitions. Second operand 14 states. [2020-07-20 16:59:14,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:59:14,433 INFO L93 Difference]: Finished difference Result 927 states and 1825 transitions. [2020-07-20 16:59:14,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:59:14,435 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 547 [2020-07-20 16:59:14,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:59:14,445 INFO L225 Difference]: With dead ends: 927 [2020-07-20 16:59:14,445 INFO L226 Difference]: Without dead ends: 431 [2020-07-20 16:59:14,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1098 GetRequests, 1074 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:59:14,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2020-07-20 16:59:14,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 431. [2020-07-20 16:59:14,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 431 states. [2020-07-20 16:59:14,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 757 transitions. [2020-07-20 16:59:14,470 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 757 transitions. Word has length 547 [2020-07-20 16:59:14,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:59:14,470 INFO L479 AbstractCegarLoop]: Abstraction has 431 states and 757 transitions. [2020-07-20 16:59:14,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:59:14,470 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 757 transitions. [2020-07-20 16:59:14,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2020-07-20 16:59:14,475 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:59:14,475 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 35, 35, 27, 27, 22, 22, 22, 22, 22, 22, 22, 17, 17, 17, 17, 17, 17, 17, 17, 10, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:59:14,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:14,676 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:59:14,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:59:14,677 INFO L82 PathProgramCache]: Analyzing trace with hash 429237824, now seen corresponding path program 39 times [2020-07-20 16:59:14,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:59:14,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203007912] [2020-07-20 16:59:14,678 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:59:15,545 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:59:15,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:59:15,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 16:59:15,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:59:15,879 INFO L134 CoverageAnalysis]: Checked inductivity of 8334 backedges. 2336 proven. 54 refuted. 0 times theorem prover too weak. 5944 trivial. 0 not checked. [2020-07-20 16:59:15,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:59:20,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:20,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:20,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:20,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:20,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:20,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:21,042 INFO L134 CoverageAnalysis]: Checked inductivity of 8334 backedges. 298 proven. 1266 refuted. 0 times theorem prover too weak. 6770 trivial. 0 not checked. [2020-07-20 16:59:21,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203007912] [2020-07-20 16:59:21,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:59:21,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 19 [2020-07-20 16:59:21,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021827115] [2020-07-20 16:59:21,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:59:21,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:59:21,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:59:21,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:59:21,045 INFO L87 Difference]: Start difference. First operand 431 states and 757 transitions. Second operand 19 states. [2020-07-20 16:59:21,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:59:21,949 INFO L93 Difference]: Finished difference Result 873 states and 1659 transitions. [2020-07-20 16:59:21,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:59:21,951 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 535 [2020-07-20 16:59:21,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:59:21,956 INFO L225 Difference]: With dead ends: 873 [2020-07-20 16:59:21,957 INFO L226 Difference]: Without dead ends: 447 [2020-07-20 16:59:21,959 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1081 GetRequests, 1041 SyntacticMatches, 11 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=178, Invalid=752, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:59:21,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2020-07-20 16:59:21,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 421. [2020-07-20 16:59:21,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 421 states. [2020-07-20 16:59:21,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 421 states to 421 states and 729 transitions. [2020-07-20 16:59:21,981 INFO L78 Accepts]: Start accepts. Automaton has 421 states and 729 transitions. Word has length 535 [2020-07-20 16:59:21,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:59:21,981 INFO L479 AbstractCegarLoop]: Abstraction has 421 states and 729 transitions. [2020-07-20 16:59:21,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:59:21,981 INFO L276 IsEmpty]: Start isEmpty. Operand 421 states and 729 transitions. [2020-07-20 16:59:21,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 548 [2020-07-20 16:59:21,985 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:59:21,986 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 27, 27, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 14, 13, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:59:22,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:22,187 INFO L427 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:59:22,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:59:22,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1468941017, now seen corresponding path program 40 times [2020-07-20 16:59:22,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:59:22,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2146757942] [2020-07-20 16:59:22,189 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:59:23,005 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:59:23,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:59:23,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 1056 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 16:59:23,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:59:23,362 INFO L134 CoverageAnalysis]: Checked inductivity of 8622 backedges. 3136 proven. 116 refuted. 0 times theorem prover too weak. 5370 trivial. 0 not checked. [2020-07-20 16:59:23,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:59:28,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:28,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:28,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:28,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:28,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:28,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:29,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:29,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:29,268 INFO L134 CoverageAnalysis]: Checked inductivity of 8622 backedges. 320 proven. 1359 refuted. 0 times theorem prover too weak. 6943 trivial. 0 not checked. [2020-07-20 16:59:29,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2146757942] [2020-07-20 16:59:29,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:59:29,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16] total 21 [2020-07-20 16:59:29,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383849032] [2020-07-20 16:59:29,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:59:29,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:59:29,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:59:29,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:59:29,271 INFO L87 Difference]: Start difference. First operand 421 states and 729 transitions. Second operand 21 states. [2020-07-20 16:59:30,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:59:30,417 INFO L93 Difference]: Finished difference Result 876 states and 1565 transitions. [2020-07-20 16:59:30,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 16:59:30,419 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 547 [2020-07-20 16:59:30,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:59:30,424 INFO L225 Difference]: With dead ends: 876 [2020-07-20 16:59:30,425 INFO L226 Difference]: Without dead ends: 461 [2020-07-20 16:59:30,428 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1107 GetRequests, 1061 SyntacticMatches, 13 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=222, Invalid=968, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:59:30,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2020-07-20 16:59:30,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 424. [2020-07-20 16:59:30,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 424 states. [2020-07-20 16:59:30,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 739 transitions. [2020-07-20 16:59:30,450 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 739 transitions. Word has length 547 [2020-07-20 16:59:30,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:59:30,451 INFO L479 AbstractCegarLoop]: Abstraction has 424 states and 739 transitions. [2020-07-20 16:59:30,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:59:30,451 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 739 transitions. [2020-07-20 16:59:30,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 524 [2020-07-20 16:59:30,455 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:59:30,455 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 27, 27, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 12, 11, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:59:30,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:30,658 INFO L427 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:59:30,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:59:30,659 INFO L82 PathProgramCache]: Analyzing trace with hash -790390391, now seen corresponding path program 41 times [2020-07-20 16:59:30,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:59:30,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2071096679] [2020-07-20 16:59:30,659 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:59:31,485 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:59:31,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:59:31,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 1010 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 16:59:31,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:59:31,930 INFO L134 CoverageAnalysis]: Checked inductivity of 7846 backedges. 3899 proven. 303 refuted. 0 times theorem prover too weak. 3644 trivial. 0 not checked. [2020-07-20 16:59:31,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:59:37,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:37,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:37,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:37,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:37,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:37,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:38,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:39,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:39,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:39,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:39,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:39,683 INFO L134 CoverageAnalysis]: Checked inductivity of 7846 backedges. 393 proven. 1634 refuted. 0 times theorem prover too weak. 5819 trivial. 0 not checked. [2020-07-20 16:59:39,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2071096679] [2020-07-20 16:59:39,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:59:39,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 22] total 27 [2020-07-20 16:59:39,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179996616] [2020-07-20 16:59:39,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 16:59:39,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:59:39,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 16:59:39,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:59:39,685 INFO L87 Difference]: Start difference. First operand 424 states and 739 transitions. Second operand 27 states. [2020-07-20 16:59:41,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:59:41,600 INFO L93 Difference]: Finished difference Result 854 states and 1548 transitions. [2020-07-20 16:59:41,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 16:59:41,602 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 523 [2020-07-20 16:59:41,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:59:41,607 INFO L225 Difference]: With dead ends: 854 [2020-07-20 16:59:41,607 INFO L226 Difference]: Without dead ends: 435 [2020-07-20 16:59:41,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1066 GetRequests, 1001 SyntacticMatches, 19 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=386, Invalid=1870, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 16:59:41,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 435 states. [2020-07-20 16:59:41,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 435 to 384. [2020-07-20 16:59:41,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-20 16:59:41,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 639 transitions. [2020-07-20 16:59:41,699 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 639 transitions. Word has length 523 [2020-07-20 16:59:41,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:59:41,700 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 639 transitions. [2020-07-20 16:59:41,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 16:59:41,700 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 639 transitions. [2020-07-20 16:59:41,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 16:59:41,703 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:59:41,704 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 34, 34, 27, 27, 19, 19, 19, 19, 19, 19, 19, 17, 17, 17, 17, 17, 17, 17, 12, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:59:41,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:41,905 INFO L427 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:59:41,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:59:41,905 INFO L82 PathProgramCache]: Analyzing trace with hash -147046213, now seen corresponding path program 42 times [2020-07-20 16:59:41,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:59:41,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314318320] [2020-07-20 16:59:41,906 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:59:42,758 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:59:42,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:59:42,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 16:59:42,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:59:43,108 INFO L134 CoverageAnalysis]: Checked inductivity of 7138 backedges. 3621 proven. 281 refuted. 0 times theorem prover too weak. 3236 trivial. 0 not checked. [2020-07-20 16:59:43,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:59:48,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:48,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:48,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:49,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:49,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:49,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:49,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:49,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:49,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:50,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:59:50,279 INFO L134 CoverageAnalysis]: Checked inductivity of 7138 backedges. 363 proven. 1382 refuted. 0 times theorem prover too weak. 5393 trivial. 0 not checked. [2020-07-20 16:59:50,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314318320] [2020-07-20 16:59:50,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:59:50,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 20] total 25 [2020-07-20 16:59:50,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545272671] [2020-07-20 16:59:50,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:59:50,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:59:50,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:59:50,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:59:50,282 INFO L87 Difference]: Start difference. First operand 384 states and 639 transitions. Second operand 25 states. [2020-07-20 16:59:52,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:59:52,042 INFO L93 Difference]: Finished difference Result 800 states and 1382 transitions. [2020-07-20 16:59:52,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 16:59:52,044 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 499 [2020-07-20 16:59:52,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:59:52,049 INFO L225 Difference]: With dead ends: 800 [2020-07-20 16:59:52,050 INFO L226 Difference]: Without dead ends: 422 [2020-07-20 16:59:52,052 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 957 SyntacticMatches, 17 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=371, Invalid=1699, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:59:52,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2020-07-20 16:59:52,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 384. [2020-07-20 16:59:52,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-20 16:59:52,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 636 transitions. [2020-07-20 16:59:52,072 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 636 transitions. Word has length 499 [2020-07-20 16:59:52,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:59:52,072 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 636 transitions. [2020-07-20 16:59:52,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:59:52,072 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 636 transitions. [2020-07-20 16:59:52,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-20 16:59:52,077 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:59:52,077 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:59:52,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:52,291 INFO L427 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:59:52,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:59:52,292 INFO L82 PathProgramCache]: Analyzing trace with hash 1326629730, now seen corresponding path program 43 times [2020-07-20 16:59:52,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:59:52,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [351337322] [2020-07-20 16:59:52,293 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 16:59:53,167 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:59:53,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:59:53,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 1029 conjuncts, 271 conjunts are in the unsatisfiable core [2020-07-20 16:59:53,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:59:55,197 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2020-07-20 16:59:55,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:00:07,279 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2020-07-20 17:00:07,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [351337322] [2020-07-20 17:00:07,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:00:07,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 52 [2020-07-20 17:00:07,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946770019] [2020-07-20 17:00:07,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-20 17:00:07,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:00:07,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-20 17:00:07,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 17:00:07,281 INFO L87 Difference]: Start difference. First operand 384 states and 636 transitions. Second operand 52 states. [2020-07-20 17:00:09,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:00:09,310 INFO L93 Difference]: Finished difference Result 419 states and 714 transitions. [2020-07-20 17:00:09,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 17:00:09,313 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 463 [2020-07-20 17:00:09,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:00:09,318 INFO L225 Difference]: With dead ends: 419 [2020-07-20 17:00:09,318 INFO L226 Difference]: Without dead ends: 415 [2020-07-20 17:00:09,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 925 GetRequests, 875 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 17:00:09,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2020-07-20 17:00:09,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 407. [2020-07-20 17:00:09,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 407 states. [2020-07-20 17:00:09,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 698 transitions. [2020-07-20 17:00:09,342 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 698 transitions. Word has length 463 [2020-07-20 17:00:09,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:00:09,342 INFO L479 AbstractCegarLoop]: Abstraction has 407 states and 698 transitions. [2020-07-20 17:00:09,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-20 17:00:09,342 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 698 transitions. [2020-07-20 17:00:09,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 512 [2020-07-20 17:00:09,347 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:00:09,348 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 36, 36, 27, 27, 19, 19, 19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 18, 18, 12, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:00:09,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:00:09,549 INFO L427 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:00:09,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:00:09,550 INFO L82 PathProgramCache]: Analyzing trace with hash -2006035762, now seen corresponding path program 44 times [2020-07-20 17:00:09,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:00:09,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2086858062] [2020-07-20 17:00:09,550 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 17:00:10,530 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:00:10,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:00:10,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 1137 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 17:00:10,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:00:11,022 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 780 proven. 1455 refuted. 0 times theorem prover too weak. 5247 trivial. 0 not checked. [2020-07-20 17:00:11,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:00:14,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:15,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:15,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:16,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:16,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:19,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:20,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:20,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:20,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:20,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:20,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:20,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:21,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:21,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:21,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:21,486 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 780 proven. 1487 refuted. 0 times theorem prover too weak. 5215 trivial. 0 not checked. [2020-07-20 17:00:21,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2086858062] [2020-07-20 17:00:21,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:00:21,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 28] total 33 [2020-07-20 17:00:21,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716827484] [2020-07-20 17:00:21,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 17:00:21,488 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:00:21,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 17:00:21,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 17:00:21,489 INFO L87 Difference]: Start difference. First operand 407 states and 698 transitions. Second operand 33 states. [2020-07-20 17:00:24,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:00:24,615 INFO L93 Difference]: Finished difference Result 823 states and 1463 transitions. [2020-07-20 17:00:24,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-20 17:00:24,617 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 511 [2020-07-20 17:00:24,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:00:24,622 INFO L225 Difference]: With dead ends: 823 [2020-07-20 17:00:24,623 INFO L226 Difference]: Without dead ends: 418 [2020-07-20 17:00:24,626 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1050 GetRequests, 965 SyntacticMatches, 25 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 792 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=604, Invalid=3178, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 17:00:24,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2020-07-20 17:00:24,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 352. [2020-07-20 17:00:24,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-20 17:00:24,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 566 transitions. [2020-07-20 17:00:24,647 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 566 transitions. Word has length 511 [2020-07-20 17:00:24,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:00:24,647 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 566 transitions. [2020-07-20 17:00:24,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 17:00:24,648 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 566 transitions. [2020-07-20 17:00:24,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 17:00:24,651 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:00:24,651 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 35, 35, 27, 27, 19, 19, 19, 19, 19, 19, 19, 17, 17, 17, 17, 17, 17, 17, 11, 10, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:00:24,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:00:24,852 INFO L427 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:00:24,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:00:24,853 INFO L82 PathProgramCache]: Analyzing trace with hash 982629303, now seen corresponding path program 45 times [2020-07-20 17:00:24,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:00:24,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611116967] [2020-07-20 17:00:24,854 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 17:00:25,810 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:00:25,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:00:25,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 1110 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 17:00:25,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:00:26,394 INFO L134 CoverageAnalysis]: Checked inductivity of 7122 backedges. 919 proven. 1265 refuted. 0 times theorem prover too weak. 4938 trivial. 0 not checked. [2020-07-20 17:00:26,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:00:29,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:29,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:30,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:30,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:30,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:30,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:30,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:31,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:34,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:34,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:35,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:35,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:35,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:36,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:36,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:36,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:36,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:36,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:36,840 INFO L134 CoverageAnalysis]: Checked inductivity of 7122 backedges. 917 proven. 1299 refuted. 0 times theorem prover too weak. 4906 trivial. 0 not checked. [2020-07-20 17:00:36,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611116967] [2020-07-20 17:00:36,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:00:36,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 28] total 33 [2020-07-20 17:00:36,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439137794] [2020-07-20 17:00:36,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 17:00:36,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:00:36,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 17:00:36,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 17:00:36,842 INFO L87 Difference]: Start difference. First operand 352 states and 566 transitions. Second operand 33 states. [2020-07-20 17:00:39,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:00:39,748 INFO L93 Difference]: Finished difference Result 763 states and 1258 transitions. [2020-07-20 17:00:39,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 17:00:39,751 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 499 [2020-07-20 17:00:39,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:00:39,756 INFO L225 Difference]: With dead ends: 763 [2020-07-20 17:00:39,756 INFO L226 Difference]: Without dead ends: 417 [2020-07-20 17:00:39,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1024 GetRequests, 941 SyntacticMatches, 25 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=585, Invalid=2955, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 17:00:39,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2020-07-20 17:00:39,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 371. [2020-07-20 17:00:39,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 371 states. [2020-07-20 17:00:39,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 603 transitions. [2020-07-20 17:00:39,779 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 603 transitions. Word has length 499 [2020-07-20 17:00:39,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:00:39,779 INFO L479 AbstractCegarLoop]: Abstraction has 371 states and 603 transitions. [2020-07-20 17:00:39,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 17:00:39,780 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 603 transitions. [2020-07-20 17:00:39,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 524 [2020-07-20 17:00:39,784 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:00:39,785 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 27, 27, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 12, 11, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:00:39,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:00:39,987 INFO L427 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:00:39,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:00:39,989 INFO L82 PathProgramCache]: Analyzing trace with hash -306697331, now seen corresponding path program 46 times [2020-07-20 17:00:39,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:00:39,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1195937711] [2020-07-20 17:00:39,989 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 17:00:40,964 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:00:40,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:00:40,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 1010 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 17:00:40,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:00:41,326 INFO L134 CoverageAnalysis]: Checked inductivity of 7846 backedges. 3420 proven. 143 refuted. 0 times theorem prover too weak. 4283 trivial. 0 not checked. [2020-07-20 17:00:41,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:00:47,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:47,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:47,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:47,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:48,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:48,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:49,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:49,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:49,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:49,540 INFO L134 CoverageAnalysis]: Checked inductivity of 7846 backedges. 401 proven. 1376 refuted. 0 times theorem prover too weak. 6069 trivial. 0 not checked. [2020-07-20 17:00:49,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1195937711] [2020-07-20 17:00:49,541 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:00:49,541 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 23 [2020-07-20 17:00:49,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640322346] [2020-07-20 17:00:49,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 17:00:49,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:00:49,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 17:00:49,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2020-07-20 17:00:49,543 INFO L87 Difference]: Start difference. First operand 371 states and 603 transitions. Second operand 23 states. [2020-07-20 17:00:50,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:00:50,971 INFO L93 Difference]: Finished difference Result 732 states and 1236 transitions. [2020-07-20 17:00:50,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 17:00:50,975 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 523 [2020-07-20 17:00:50,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:00:50,980 INFO L225 Difference]: With dead ends: 732 [2020-07-20 17:00:50,980 INFO L226 Difference]: Without dead ends: 361 [2020-07-20 17:00:50,983 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1059 GetRequests, 1009 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=233, Invalid=1099, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 17:00:50,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2020-07-20 17:00:51,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 344. [2020-07-20 17:00:51,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 344 states. [2020-07-20 17:00:51,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 535 transitions. [2020-07-20 17:00:51,013 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 535 transitions. Word has length 523 [2020-07-20 17:00:51,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:00:51,013 INFO L479 AbstractCegarLoop]: Abstraction has 344 states and 535 transitions. [2020-07-20 17:00:51,013 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 17:00:51,014 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 535 transitions. [2020-07-20 17:00:51,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 17:00:51,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:00:51,018 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 34, 34, 27, 27, 19, 19, 19, 19, 19, 19, 19, 17, 17, 17, 17, 17, 17, 17, 12, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:00:51,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:00:51,230 INFO L427 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:00:51,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:00:51,231 INFO L82 PathProgramCache]: Analyzing trace with hash -46034437, now seen corresponding path program 47 times [2020-07-20 17:00:51,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:00:51,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1274420171] [2020-07-20 17:00:51,232 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 17:00:52,218 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:00:52,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:00:52,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:00:52,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:00:52,624 INFO L134 CoverageAnalysis]: Checked inductivity of 7138 backedges. 3634 proven. 268 refuted. 0 times theorem prover too weak. 3236 trivial. 0 not checked. [2020-07-20 17:00:52,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:00:58,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:58,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:58,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:58,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:00:58,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:00,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:00,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:00,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:00,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:00,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:00,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:00,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:01,080 INFO L134 CoverageAnalysis]: Checked inductivity of 7138 backedges. 376 proven. 1369 refuted. 0 times theorem prover too weak. 5393 trivial. 0 not checked. [2020-07-20 17:01:01,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1274420171] [2020-07-20 17:01:01,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:01:01,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 20] total 25 [2020-07-20 17:01:01,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331502123] [2020-07-20 17:01:01,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 17:01:01,082 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:01:01,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 17:01:01,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2020-07-20 17:01:01,083 INFO L87 Difference]: Start difference. First operand 344 states and 535 transitions. Second operand 25 states. [2020-07-20 17:01:02,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:01:02,881 INFO L93 Difference]: Finished difference Result 702 states and 1114 transitions. [2020-07-20 17:01:02,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 17:01:02,884 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 499 [2020-07-20 17:01:02,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:01:02,889 INFO L225 Difference]: With dead ends: 702 [2020-07-20 17:01:02,889 INFO L226 Difference]: Without dead ends: 364 [2020-07-20 17:01:02,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 957 SyntacticMatches, 17 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=348, Invalid=1544, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 17:01:02,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2020-07-20 17:01:02,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 339. [2020-07-20 17:01:02,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 339 states. [2020-07-20 17:01:02,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 523 transitions. [2020-07-20 17:01:02,909 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 523 transitions. Word has length 499 [2020-07-20 17:01:02,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:01:02,910 INFO L479 AbstractCegarLoop]: Abstraction has 339 states and 523 transitions. [2020-07-20 17:01:02,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 17:01:02,910 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 523 transitions. [2020-07-20 17:01:02,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 584 [2020-07-20 17:01:02,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:01:02,915 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 27, 27, 22, 22, 22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 21, 17, 16, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:01:03,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:01:03,128 INFO L427 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:01:03,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:01:03,129 INFO L82 PathProgramCache]: Analyzing trace with hash 305219520, now seen corresponding path program 48 times [2020-07-20 17:01:03,129 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:01:03,129 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1149294135] [2020-07-20 17:01:03,130 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 17:01:04,168 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:01:04,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:01:04,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 1127 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 17:01:04,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:01:04,676 INFO L134 CoverageAnalysis]: Checked inductivity of 9862 backedges. 5257 proven. 405 refuted. 0 times theorem prover too weak. 4200 trivial. 0 not checked. [2020-07-20 17:01:04,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:01:11,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:11,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:12,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:12,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:12,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:14,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:14,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:14,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:15,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:15,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:15,498 INFO L134 CoverageAnalysis]: Checked inductivity of 9862 backedges. 551 proven. 1741 refuted. 0 times theorem prover too weak. 7570 trivial. 0 not checked. [2020-07-20 17:01:15,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1149294135] [2020-07-20 17:01:15,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:01:15,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 22] total 27 [2020-07-20 17:01:15,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395365376] [2020-07-20 17:01:15,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 17:01:15,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:01:15,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 17:01:15,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2020-07-20 17:01:15,500 INFO L87 Difference]: Start difference. First operand 339 states and 523 transitions. Second operand 27 states. [2020-07-20 17:01:17,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:01:17,583 INFO L93 Difference]: Finished difference Result 673 states and 1075 transitions. [2020-07-20 17:01:17,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 17:01:17,586 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 583 [2020-07-20 17:01:17,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:01:17,590 INFO L225 Difference]: With dead ends: 673 [2020-07-20 17:01:17,590 INFO L226 Difference]: Without dead ends: 339 [2020-07-20 17:01:17,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1182 GetRequests, 1121 SyntacticMatches, 19 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 344 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=323, Invalid=1569, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 17:01:17,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2020-07-20 17:01:17,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 316. [2020-07-20 17:01:17,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-20 17:01:17,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 460 transitions. [2020-07-20 17:01:17,609 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 460 transitions. Word has length 583 [2020-07-20 17:01:17,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:01:17,609 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 460 transitions. [2020-07-20 17:01:17,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 17:01:17,610 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 460 transitions. [2020-07-20 17:01:17,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 669 [2020-07-20 17:01:17,614 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:01:17,614 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 47, 47, 34, 33, 26, 26, 26, 26, 26, 26, 26, 23, 23, 23, 23, 23, 23, 23, 19, 13, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:01:17,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:01:17,816 INFO L427 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:01:17,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:01:17,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1309875190, now seen corresponding path program 49 times [2020-07-20 17:01:17,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:01:17,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1322407895] [2020-07-20 17:01:17,818 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 17:01:18,945 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:01:18,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:01:18,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 17:01:18,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:01:19,509 INFO L134 CoverageAnalysis]: Checked inductivity of 13029 backedges. 6053 proven. 1151 refuted. 0 times theorem prover too weak. 5825 trivial. 0 not checked. [2020-07-20 17:01:19,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:01:26,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:26,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:26,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:26,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:27,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:27,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:27,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:31,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:31,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:33,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:33,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:33,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:34,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:34,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:34,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:34,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:34,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:34,845 INFO L134 CoverageAnalysis]: Checked inductivity of 13029 backedges. 1091 proven. 2048 refuted. 0 times theorem prover too weak. 9890 trivial. 0 not checked. [2020-07-20 17:01:34,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1322407895] [2020-07-20 17:01:34,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:01:34,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-20 17:01:34,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282338334] [2020-07-20 17:01:34,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 17:01:34,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:01:34,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 17:01:34,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2020-07-20 17:01:34,847 INFO L87 Difference]: Start difference. First operand 316 states and 460 transitions. Second operand 31 states. [2020-07-20 17:01:38,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:01:38,247 INFO L93 Difference]: Finished difference Result 677 states and 1053 transitions. [2020-07-20 17:01:38,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 17:01:38,251 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 668 [2020-07-20 17:01:38,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:01:38,257 INFO L225 Difference]: With dead ends: 677 [2020-07-20 17:01:38,257 INFO L226 Difference]: Without dead ends: 367 [2020-07-20 17:01:38,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1359 GetRequests, 1281 SyntacticMatches, 25 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 638 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=468, Invalid=2502, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 17:01:38,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2020-07-20 17:01:38,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 337. [2020-07-20 17:01:38,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2020-07-20 17:01:38,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 523 transitions. [2020-07-20 17:01:38,277 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 523 transitions. Word has length 668 [2020-07-20 17:01:38,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:01:38,277 INFO L479 AbstractCegarLoop]: Abstraction has 337 states and 523 transitions. [2020-07-20 17:01:38,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 17:01:38,277 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 523 transitions. [2020-07-20 17:01:38,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 456 [2020-07-20 17:01:38,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:01:38,280 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 23, 23, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:01:38,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:01:38,483 INFO L427 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:01:38,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:01:38,483 INFO L82 PathProgramCache]: Analyzing trace with hash -1852541062, now seen corresponding path program 50 times [2020-07-20 17:01:38,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:01:38,484 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1211333969] [2020-07-20 17:01:38,484 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 17:01:39,530 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:01:39,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:01:39,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 679 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 17:01:39,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:01:40,179 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 796 proven. 1225 refuted. 0 times theorem prover too weak. 3865 trivial. 0 not checked. [2020-07-20 17:01:40,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:01:45,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:45,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:45,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:45,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:46,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:46,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:46,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:46,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:46,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:46,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:50,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:50,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:51,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:52,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:52,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:52,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:53,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:53,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:53,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:01:53,420 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 796 proven. 1263 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-20 17:01:53,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1211333969] [2020-07-20 17:01:53,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:01:53,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-20 17:01:53,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276123528] [2020-07-20 17:01:53,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 17:01:53,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:01:53,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 17:01:53,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 17:01:53,422 INFO L87 Difference]: Start difference. First operand 337 states and 523 transitions. Second operand 33 states. [2020-07-20 17:01:57,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:01:57,215 INFO L93 Difference]: Finished difference Result 704 states and 1126 transitions. [2020-07-20 17:01:57,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-20 17:01:57,219 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 455 [2020-07-20 17:01:57,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:01:57,224 INFO L225 Difference]: With dead ends: 704 [2020-07-20 17:01:57,224 INFO L226 Difference]: Without dead ends: 369 [2020-07-20 17:01:57,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 934 GetRequests, 851 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 719 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=505, Invalid=2801, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 17:01:57,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-20 17:01:57,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 300. [2020-07-20 17:01:57,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-20 17:01:57,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 450 transitions. [2020-07-20 17:01:57,243 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 450 transitions. Word has length 455 [2020-07-20 17:01:57,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:01:57,243 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 450 transitions. [2020-07-20 17:01:57,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 17:01:57,243 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 450 transitions. [2020-07-20 17:01:57,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 565 [2020-07-20 17:01:57,246 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:01:57,247 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 41, 41, 30, 29, 21, 21, 21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 13, 11, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:01:57,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:01:57,448 INFO L427 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:01:57,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:01:57,449 INFO L82 PathProgramCache]: Analyzing trace with hash -1006109418, now seen corresponding path program 51 times [2020-07-20 17:01:57,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:01:57,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [869211607] [2020-07-20 17:01:57,451 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 17:01:58,573 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:01:58,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:01:58,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 837 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 17:01:58,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:01:59,162 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 5054 proven. 575 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 17:01:59,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:02:08,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:08,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:09,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:09,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:09,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:09,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:09,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:09,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:10,563 WARN L193 SmtUtils]: Spent 702.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2020-07-20 17:02:13,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:13,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:13,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:14,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:14,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:14,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:14,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:14,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:14,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:14,929 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 610 proven. 1892 refuted. 0 times theorem prover too weak. 6663 trivial. 0 not checked. [2020-07-20 17:02:14,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [869211607] [2020-07-20 17:02:14,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:02:14,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-20 17:02:14,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254331343] [2020-07-20 17:02:14,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 17:02:14,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:02:14,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 17:02:14,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-20 17:02:14,931 INFO L87 Difference]: Start difference. First operand 300 states and 450 transitions. Second operand 29 states. [2020-07-20 17:02:18,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:02:18,048 INFO L93 Difference]: Finished difference Result 646 states and 999 transitions. [2020-07-20 17:02:18,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-20 17:02:18,052 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 564 [2020-07-20 17:02:18,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:02:18,057 INFO L225 Difference]: With dead ends: 646 [2020-07-20 17:02:18,057 INFO L226 Difference]: Without dead ends: 351 [2020-07-20 17:02:18,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1151 GetRequests, 1077 SyntacticMatches, 23 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 542 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=443, Invalid=2313, Unknown=0, NotChecked=0, Total=2756 [2020-07-20 17:02:18,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-20 17:02:18,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 290. [2020-07-20 17:02:18,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2020-07-20 17:02:18,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 432 transitions. [2020-07-20 17:02:18,075 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 432 transitions. Word has length 564 [2020-07-20 17:02:18,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:02:18,076 INFO L479 AbstractCegarLoop]: Abstraction has 290 states and 432 transitions. [2020-07-20 17:02:18,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 17:02:18,076 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 432 transitions. [2020-07-20 17:02:18,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 560 [2020-07-20 17:02:18,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:02:18,080 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 41, 41, 27, 27, 21, 21, 21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 15, 14, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:02:18,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:02:18,281 INFO L427 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:02:18,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:02:18,282 INFO L82 PathProgramCache]: Analyzing trace with hash 193492518, now seen corresponding path program 52 times [2020-07-20 17:02:18,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:02:18,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1125243717] [2020-07-20 17:02:18,283 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 17:02:19,481 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:02:19,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:02:19,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 1080 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 17:02:19,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:02:20,431 INFO L134 CoverageAnalysis]: Checked inductivity of 9026 backedges. 4638 proven. 801 refuted. 0 times theorem prover too weak. 3587 trivial. 0 not checked. [2020-07-20 17:02:20,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:02:28,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:28,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:29,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:29,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:29,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:29,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:33,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:33,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:34,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:34,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:34,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:34,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:35,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:35,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:35,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:36,009 INFO L134 CoverageAnalysis]: Checked inductivity of 9026 backedges. 804 proven. 1644 refuted. 0 times theorem prover too weak. 6578 trivial. 0 not checked. [2020-07-20 17:02:36,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1125243717] [2020-07-20 17:02:36,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:02:36,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 26] total 31 [2020-07-20 17:02:36,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118292643] [2020-07-20 17:02:36,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 17:02:36,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:02:36,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 17:02:36,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=818, Unknown=0, NotChecked=0, Total=930 [2020-07-20 17:02:36,012 INFO L87 Difference]: Start difference. First operand 290 states and 432 transitions. Second operand 31 states. [2020-07-20 17:02:39,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:02:39,685 INFO L93 Difference]: Finished difference Result 609 states and 946 transitions. [2020-07-20 17:02:39,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-20 17:02:39,689 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 559 [2020-07-20 17:02:39,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:02:39,695 INFO L225 Difference]: With dead ends: 609 [2020-07-20 17:02:39,695 INFO L226 Difference]: Without dead ends: 325 [2020-07-20 17:02:39,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1140 GetRequests, 1065 SyntacticMatches, 23 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=457, Invalid=2405, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 17:02:39,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2020-07-20 17:02:39,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 300. [2020-07-20 17:02:39,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-20 17:02:39,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 456 transitions. [2020-07-20 17:02:39,726 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 456 transitions. Word has length 559 [2020-07-20 17:02:39,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:02:39,727 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 456 transitions. [2020-07-20 17:02:39,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 17:02:39,727 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 456 transitions. [2020-07-20 17:02:39,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1059 [2020-07-20 17:02:39,740 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:02:39,741 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 75, 75, 55, 54, 41, 41, 41, 41, 41, 41, 41, 37, 37, 37, 37, 37, 37, 37, 28, 20, 17, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:02:39,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:02:39,957 INFO L427 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:02:39,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:02:39,958 INFO L82 PathProgramCache]: Analyzing trace with hash -576755623, now seen corresponding path program 53 times [2020-07-20 17:02:39,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:02:39,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1077740446] [2020-07-20 17:02:39,959 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 17:02:41,314 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:02:41,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:02:41,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 2041 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 17:02:41,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:02:42,092 INFO L134 CoverageAnalysis]: Checked inductivity of 33244 backedges. 671 proven. 3365 refuted. 0 times theorem prover too weak. 29208 trivial. 0 not checked. [2020-07-20 17:02:42,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:02:45,345 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 17:02:45,449 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 17:02:45,562 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 17:02:45,673 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 17:02:46,185 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 17:02:46,301 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 17:02:46,426 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 17:02:46,550 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 17:02:46,670 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 17:02:46,780 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 17:02:52,600 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 17:02:52,703 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 17:02:52,814 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 17:02:52,924 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 17:02:53,033 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 17:02:53,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:02:59,418 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 17:03:00,125 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 17:03:00,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:04,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:06,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:07,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:07,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:08,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:08,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:08,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:09,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:09,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:09,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:09,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:10,019 INFO L134 CoverageAnalysis]: Checked inductivity of 33244 backedges. 671 proven. 3421 refuted. 0 times theorem prover too weak. 29152 trivial. 0 not checked. [2020-07-20 17:03:10,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1077740446] [2020-07-20 17:03:10,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:03:10,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 26 [2020-07-20 17:03:10,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550688084] [2020-07-20 17:03:10,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 17:03:10,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:03:10,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 17:03:10,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=540, Unknown=0, NotChecked=0, Total=650 [2020-07-20 17:03:10,022 INFO L87 Difference]: Start difference. First operand 300 states and 456 transitions. Second operand 26 states. [2020-07-20 17:03:11,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:03:11,758 INFO L93 Difference]: Finished difference Result 317 states and 505 transitions. [2020-07-20 17:03:11,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 17:03:11,762 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 1058 [2020-07-20 17:03:11,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:03:11,766 INFO L225 Difference]: With dead ends: 317 [2020-07-20 17:03:11,766 INFO L226 Difference]: Without dead ends: 294 [2020-07-20 17:03:11,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2125 GetRequests, 2071 SyntacticMatches, 20 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=240, Invalid=1020, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 17:03:11,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-20 17:03:11,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 294. [2020-07-20 17:03:11,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2020-07-20 17:03:11,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 396 transitions. [2020-07-20 17:03:11,785 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 396 transitions. Word has length 1058 [2020-07-20 17:03:11,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:03:11,785 INFO L479 AbstractCegarLoop]: Abstraction has 294 states and 396 transitions. [2020-07-20 17:03:11,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 17:03:11,786 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 396 transitions. [2020-07-20 17:03:11,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1093 [2020-07-20 17:03:11,798 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:03:11,799 INFO L422 BasicCegarLoop]: trace histogram [85, 85, 82, 82, 44, 42, 42, 42, 42, 42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:03:11,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:03:12,000 INFO L427 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:03:12,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:03:12,001 INFO L82 PathProgramCache]: Analyzing trace with hash -1893493890, now seen corresponding path program 4 times [2020-07-20 17:03:12,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:03:12,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [971816632] [2020-07-20 17:03:12,001 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 17:03:13,441 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:03:13,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:03:13,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 2109 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 17:03:13,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:03:14,233 INFO L134 CoverageAnalysis]: Checked inductivity of 35969 backedges. 1167 proven. 2307 refuted. 0 times theorem prover too weak. 32495 trivial. 0 not checked. [2020-07-20 17:03:14,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:03:18,061 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 17:03:27,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:27,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:29,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:31,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:31,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:32,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:32,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:33,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:33,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:33,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:33,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:33,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:34,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:03:37,062 INFO L134 CoverageAnalysis]: Checked inductivity of 35969 backedges. 1167 proven. 2337 refuted. 0 times theorem prover too weak. 32465 trivial. 0 not checked. [2020-07-20 17:03:37,063 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [971816632] [2020-07-20 17:03:37,063 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:03:37,063 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 17:03:37,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923587813] [2020-07-20 17:03:37,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 17:03:37,064 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:03:37,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 17:03:37,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 17:03:37,065 INFO L87 Difference]: Start difference. First operand 294 states and 396 transitions. Second operand 21 states. [2020-07-20 17:03:38,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:03:38,147 INFO L93 Difference]: Finished difference Result 294 states and 396 transitions. [2020-07-20 17:03:38,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 17:03:38,152 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1092 [2020-07-20 17:03:38,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:03:38,154 INFO L225 Difference]: With dead ends: 294 [2020-07-20 17:03:38,154 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 17:03:38,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2192 GetRequests, 2148 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 17:03:38,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 17:03:38,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 17:03:38,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 17:03:38,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 17:03:38,158 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 1092 [2020-07-20 17:03:38,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:03:38,158 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 17:03:38,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 17:03:38,159 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 17:03:38,159 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 17:03:38,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:03:38,372 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 17:03:38,648 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 14 [2020-07-20 17:03:40,690 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 39 [2020-07-20 17:03:41,304 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 39 [2020-07-20 17:03:41,741 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 39 [2020-07-20 17:03:44,153 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 23 [2020-07-20 17:03:44,295 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 23 [2020-07-20 17:03:44,485 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 17 [2020-07-20 17:03:44,908 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 23 [2020-07-20 17:03:45,115 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 23 [2020-07-20 17:03:45,372 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 17 [2020-07-20 17:03:47,647 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 3 [2020-07-20 17:03:47,833 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 3 [2020-07-20 17:03:48,087 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 3 [2020-07-20 17:03:48,294 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 3 [2020-07-20 17:04:06,045 WARN L193 SmtUtils]: Spent 1.02 s on a formula simplification. DAG size of input: 360 DAG size of output: 191 [2020-07-20 17:04:06,348 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 136 [2020-07-20 17:04:08,706 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 135 [2020-07-20 17:04:09,144 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 135 [2020-07-20 17:04:09,277 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 136 [2020-07-20 17:04:09,674 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 135 [2020-07-20 17:04:18,887 WARN L193 SmtUtils]: Spent 5.98 s on a formula simplification. DAG size of input: 546 DAG size of output: 9 [2020-07-20 17:04:24,005 WARN L193 SmtUtils]: Spent 5.09 s on a formula simplification. DAG size of input: 486 DAG size of output: 1 [2020-07-20 17:04:29,647 WARN L193 SmtUtils]: Spent 5.62 s on a formula simplification. DAG size of input: 519 DAG size of output: 1 [2020-07-20 17:04:38,160 WARN L193 SmtUtils]: Spent 8.49 s on a formula simplification. DAG size of input: 562 DAG size of output: 32 [2020-07-20 17:04:45,637 WARN L193 SmtUtils]: Spent 7.45 s on a formula simplification. DAG size of input: 487 DAG size of output: 8 [2020-07-20 17:05:04,431 WARN L193 SmtUtils]: Spent 18.76 s on a formula simplification. DAG size of input: 712 DAG size of output: 40 [2020-07-20 17:05:04,438 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 17:05:04,438 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:05:04,438 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:05:04,438 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 17:05:04,439 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 17:05:04,439 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 17:05:04,439 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-20 17:05:04,439 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-20 17:05:04,439 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-20 17:05:04,439 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-20 17:05:04,439 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-20 17:05:04,440 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-20 17:05:04,440 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= 8 main_~x~0) (<= main_~x~0 8)) [2020-07-20 17:05:04,440 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-20 17:05:04,440 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-20 17:05:04,440 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-20 17:05:04,440 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (not (<= |fibo2_#in~n| 2))) [2020-07-20 17:05:04,440 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-20 17:05:04,441 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (and (or (not (<= |fibo2_#in~n| 5)) (= 2 |fibo2_#t~ret2|)) (not (<= |fibo2_#in~n| 3)) (let ((.cse1 (< fibo2_~n 8)) (.cse3 (<= 6 fibo2_~n)) (.cse0 (<= fibo2_~n |fibo2_#in~n|)) (.cse2 (<= |fibo2_#in~n| fibo2_~n))) (or (and .cse0 .cse1 .cse2 (<= |fibo2_#in~n| 6) .cse3 (= 5 |fibo2_#t~ret2|)) (and .cse0 .cse1 .cse2 .cse3 (= 8 |fibo2_#t~ret2|) (<= 7 |fibo2_#in~n|)) (and .cse0 .cse2 (<= 8 fibo2_~n)) (and (< fibo2_~n 5) .cse2)))) [2020-07-20 17:05:04,441 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-20 17:05:04,441 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-20 17:05:04,441 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-20 17:05:04,441 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-20 17:05:04,441 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-20 17:05:04,441 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-20 17:05:04,442 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= fibo1_~n |fibo1_#in~n|) (not (<= |fibo1_#in~n| 2)) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-20 17:05:04,442 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-20 17:05:04,442 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (and (not (<= |fibo1_#in~n| 3)) (let ((.cse1 (<= fibo1_~n |fibo1_#in~n|)) (.cse0 (<= |fibo1_#in~n| fibo1_~n))) (or (and (<= 7 |fibo1_#in~n|) (<= fibo1_~n 7) .cse0) (and .cse1 (<= 5 fibo1_~n) (< fibo1_~n 6) (= 3 |fibo1_#t~ret0|) .cse0) (and (= 5 |fibo1_#t~ret0|) .cse1 (<= 6 fibo1_~n) .cse0) (and .cse1 .cse0 (<= 8 |fibo1_#in~n|)) (and (<= fibo1_~n 4) (= 2 |fibo1_#t~ret0|) .cse0))) (or (<= 9 |fibo1_#in~n|) (<= |fibo1_#in~n| 7) (= 13 |fibo1_#t~ret0|))) [2020-07-20 17:05:04,442 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-20 17:05:04,442 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-20 17:05:04,442 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-20 17:05:04,442 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-20 17:05:04,442 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-20 17:05:04,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:05:04 BoogieIcfgContainer [2020-07-20 17:05:04,448 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 17:05:04,450 INFO L168 Benchmark]: Toolchain (without parser) took 574176.17 ms. Allocated memory was 141.6 MB in the beginning and 2.3 GB in the end (delta: 2.2 GB). Free memory was 99.5 MB in the beginning and 1.3 GB in the end (delta: -1.2 GB). Peak memory consumption was 2.1 GB. Max. memory is 7.1 GB. [2020-07-20 17:05:04,451 INFO L168 Benchmark]: CDTParser took 1.43 ms. Allocated memory is still 141.6 MB. Free memory was 117.7 MB in the beginning and 117.5 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 17:05:04,451 INFO L168 Benchmark]: CACSL2BoogieTranslator took 368.59 ms. Allocated memory is still 141.6 MB. Free memory was 99.1 MB in the beginning and 89.6 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-20 17:05:04,451 INFO L168 Benchmark]: Boogie Preprocessor took 45.49 ms. Allocated memory is still 141.6 MB. Free memory was 89.6 MB in the beginning and 88.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 17:05:04,452 INFO L168 Benchmark]: RCFGBuilder took 603.75 ms. Allocated memory was 141.6 MB in the beginning and 199.8 MB in the end (delta: 58.2 MB). Free memory was 88.2 MB in the beginning and 165.9 MB in the end (delta: -77.7 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-20 17:05:04,452 INFO L168 Benchmark]: TraceAbstraction took 573142.81 ms. Allocated memory was 199.8 MB in the beginning and 2.3 GB in the end (delta: 2.1 GB). Free memory was 165.2 MB in the beginning and 1.3 GB in the end (delta: -1.2 GB). Peak memory consumption was 2.1 GB. Max. memory is 7.1 GB. [2020-07-20 17:05:04,454 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.43 ms. Allocated memory is still 141.6 MB. Free memory was 117.7 MB in the beginning and 117.5 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 368.59 ms. Allocated memory is still 141.6 MB. Free memory was 99.1 MB in the beginning and 89.6 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 45.49 ms. Allocated memory is still 141.6 MB. Free memory was 89.6 MB in the beginning and 88.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 603.75 ms. Allocated memory was 141.6 MB in the beginning and 199.8 MB in the end (delta: 58.2 MB). Free memory was 88.2 MB in the beginning and 165.9 MB in the end (delta: -77.7 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 573142.81 ms. Allocated memory was 199.8 MB in the beginning and 2.3 GB in the end (delta: 2.1 GB). Free memory was 165.2 MB in the beginning and 1.3 GB in the end (delta: -1.2 GB). Peak memory consumption was 2.1 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 486.9s, OverallIterations: 72, TraceHistogramMax: 85, AutomataDifference: 82.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 86.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2532 SDtfs, 7057 SDslu, 24955 SDs, 0 SdLazy, 35668 SolverSat, 8656 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 28.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 45384 GetRequests, 42070 SyntacticMatches, 1012 SemanticMatches, 2302 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17990 ImplicationChecksByTransitivity, 70.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=502occurred in iteration=55, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 1.6s AutomataMinimizationTime, 72 MinimizatonAttempts, 2378 StatesRemovedByMinimization, 68 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 7622 PreInvPairs, 16857 NumberOfFragments, 179 HoareAnnotationTreeSize, 7622 FomulaSimplifications, 26581104349581 FormulaSimplificationTreeSizeReduction, 34.2s HoareSimplificationTime, 11 FomulaSimplificationsInter, 41000178237804 FormulaSimplificationTreeSizeReductionInter, 51.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 1.3s SsaConstructionTime, 5.2s SatisfiabilityAnalysisTime, 354.2s InterpolantComputationTime, 22247 NumberOfCodeBlocks, 14332 NumberOfCodeBlocksAsserted, 184 NumberOfCheckSat, 44325 ConstructedInterpolants, 0 QuantifiedInterpolants, 29984641 SizeOfPredicates, 605 NumberOfNonLiveVariables, 38251 ConjunctsInSsa, 1406 ConjunctsInUnsatCore, 142 InterpolantComputations, 2 PerfectInterpolantSequences, 538768/623542 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...