/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_6-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:54:36,207 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:54:36,213 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:54:36,250 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:54:36,251 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:54:36,255 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:54:36,259 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:54:36,278 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:54:36,285 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:54:36,289 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:54:36,293 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:54:36,296 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:54:36,296 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:54:36,298 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:54:36,300 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:54:36,302 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:54:36,304 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:54:36,305 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:54:36,308 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:54:36,312 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:54:36,314 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:54:36,317 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:54:36,319 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:54:36,320 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:54:36,324 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:54:36,337 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:54:36,339 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:54:36,340 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:54:36,342 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 16:54:36,367 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:54:36,368 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:54:36,370 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:54:36,371 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:54:36,371 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:54:36,372 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:54:36,372 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:54:36,372 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:54:36,372 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:54:36,373 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:54:36,373 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:54:36,373 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:54:36,373 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:54:36,373 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:54:36,374 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:54:36,374 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:54:36,374 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:54:36,374 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:54:36,375 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:54:36,375 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:54:36,375 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:54:36,375 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:54:36,376 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:54:36,376 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:54:36,376 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:54:36,376 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:54:36,376 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:36,377 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:54:36,377 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:54:36,377 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 16:54:36,807 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:54:36,828 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:54:36,834 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:54:36,837 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:54:36,838 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:54:36,839 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c [2020-07-20 16:54:36,987 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bd5ebb74a/27b83dbf94964547955ee495a70d76b1/FLAG3b628190f [2020-07-20 16:54:37,844 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:54:37,846 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c [2020-07-20 16:54:37,859 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bd5ebb74a/27b83dbf94964547955ee495a70d76b1/FLAG3b628190f [2020-07-20 16:54:37,883 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bd5ebb74a/27b83dbf94964547955ee495a70d76b1 [2020-07-20 16:54:37,901 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:54:37,905 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:54:37,908 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:54:37,908 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:54:37,915 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:54:37,917 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:54:37" (1/1) ... [2020-07-20 16:54:37,923 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d436f55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:37, skipping insertion in model container [2020-07-20 16:54:37,924 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:54:37" (1/1) ... [2020-07-20 16:54:37,939 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:54:37,968 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:54:38,303 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:54:38,313 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:54:38,342 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:54:38,368 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:54:38,369 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:38 WrapperNode [2020-07-20 16:54:38,369 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:54:38,372 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:54:38,372 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:54:38,372 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:54:38,390 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:38" (1/1) ... [2020-07-20 16:54:38,390 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:38" (1/1) ... [2020-07-20 16:54:38,400 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:38" (1/1) ... [2020-07-20 16:54:38,401 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:38" (1/1) ... [2020-07-20 16:54:38,536 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:38" (1/1) ... [2020-07-20 16:54:38,555 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:38" (1/1) ... [2020-07-20 16:54:38,557 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:38" (1/1) ... [2020-07-20 16:54:38,561 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:54:38,563 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:54:38,563 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:54:38,563 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:54:38,566 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:38" (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 16:54:38,679 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:54:38,679 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:54:38,680 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 16:54:38,680 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 16:54:38,681 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:54:38,682 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:54:38,683 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:54:38,684 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 16:54:38,684 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 16:54:38,685 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:54:38,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:54:38,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:54:39,044 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:54:39,044 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:54:39,058 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:54:39 BoogieIcfgContainer [2020-07-20 16:54:39,059 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:54:39,079 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:54:39,080 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:54:39,100 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:54:39,101 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:54:37" (1/3) ... [2020-07-20 16:54:39,110 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71e6c8b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:54:39, skipping insertion in model container [2020-07-20 16:54:39,111 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:38" (2/3) ... [2020-07-20 16:54:39,112 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71e6c8b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:54:39, skipping insertion in model container [2020-07-20 16:54:39,112 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:54:39" (3/3) ... [2020-07-20 16:54:39,124 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-2.c [2020-07-20 16:54:39,174 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:54:39,193 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:54:39,218 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:54:39,278 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:54:39,279 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:54:39,279 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:54:39,279 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:54:39,280 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:54:39,280 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:54:39,280 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:54:39,280 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:54:39,315 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 16:54:39,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:54:39,329 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:39,332 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:39,333 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:39,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:39,343 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 16:54:39,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:39,354 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1947384660] [2020-07-20 16:54:39,355 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 16:54:39,463 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:39,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:39,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:54:39,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:39,623 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 16:54:39,624 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:54:39,626 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1947384660] [2020-07-20 16:54:39,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:54:39,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:54:39,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770171879] [2020-07-20 16:54:39,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:54:39,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:39,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:54:39,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:54:39,671 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 16:54:39,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:39,882 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 16:54:39,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:54:39,887 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:54:39,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:39,914 INFO L225 Difference]: With dead ends: 44 [2020-07-20 16:54:39,915 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:54:39,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:54:39,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:54:40,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 16:54:40,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:54:40,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:54:40,013 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 16:54:40,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:40,015 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:54:40,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:54:40,016 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:54:40,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:54:40,020 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:40,021 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:40,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:40,240 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:40,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:40,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 16:54:40,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:40,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [658291056] [2020-07-20 16:54:40,243 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 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 16:54:40,299 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:40,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:40,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:54:40,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:40,398 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 16:54:40,399 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:54:40,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [658291056] [2020-07-20 16:54:40,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:54:40,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:54:40,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628448890] [2020-07-20 16:54:40,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:54:40,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:40,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:54:40,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:54:40,413 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 16:54:40,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:40,537 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 16:54:40,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:54:40,540 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:54:40,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:40,543 INFO L225 Difference]: With dead ends: 36 [2020-07-20 16:54:40,544 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 16:54:40,546 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 16:54:40,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 16:54:40,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 16:54:40,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:54:40,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:54:40,562 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 16:54:40,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:40,564 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:54:40,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:54:40,565 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:54:40,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:54:40,569 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:40,570 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 16:54:40,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:40,788 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:40,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:40,789 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 16:54:40,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:40,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567374767] [2020-07-20 16:54:40,791 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 16:54:40,879 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:40,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:40,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:54:40,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:40,957 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 16:54:40,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:41,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:41,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:41,308 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 16:54:41,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [567374767] [2020-07-20 16:54:41,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:41,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:54:41,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955085137] [2020-07-20 16:54:41,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:54:41,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:41,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:54:41,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:54:41,315 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 16:54:41,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:41,530 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 16:54:41,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:54:41,532 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 16:54:41,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:41,534 INFO L225 Difference]: With dead ends: 41 [2020-07-20 16:54:41,535 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:54:41,536 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 16:54:41,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:54:41,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 16:54:41,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:54:41,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:54:41,549 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 16:54:41,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:41,550 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:54:41,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:54:41,550 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:54:41,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:54:41,553 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:41,553 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 16:54:41,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:41,759 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:41,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:41,760 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 16:54:41,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:41,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [878706847] [2020-07-20 16:54:41,762 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 16:54:41,803 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:41,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:41,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:54:41,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:41,920 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 16:54:41,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:42,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:42,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:42,329 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 16:54:42,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [878706847] [2020-07-20 16:54:42,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:42,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:54:42,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441890899] [2020-07-20 16:54:42,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:54:42,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:42,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:54:42,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:54:42,337 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 16:54:42,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:42,626 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 16:54:42,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:54:42,627 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 16:54:42,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:42,636 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:54:42,637 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:54:42,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:42,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:54:42,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 16:54:42,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:54:42,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:54:42,667 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 16:54:42,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:42,668 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:54:42,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:54:42,669 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:54:42,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:54:42,671 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:42,671 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 16:54:42,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:42,883 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:42,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:42,884 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 16:54:42,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:42,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [675026117] [2020-07-20 16:54:42,886 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 16:54:42,947 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:42,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:42,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:42,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:43,071 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 16:54:43,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:43,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:43,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:43,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:43,610 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 16:54:43,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [675026117] [2020-07-20 16:54:43,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:43,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:54:43,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351175398] [2020-07-20 16:54:43,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:54:43,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:43,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:54:43,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:43,621 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 16:54:43,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:43,918 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 16:54:43,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:43,924 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 16:54:43,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:43,927 INFO L225 Difference]: With dead ends: 51 [2020-07-20 16:54:43,928 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 16:54:43,929 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 16:54:43,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 16:54:43,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 16:54:43,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 16:54:43,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 16:54:43,944 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 16:54:43,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:43,945 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 16:54:43,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:54:43,945 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 16:54:43,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:54:43,948 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:43,949 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 16:54:44,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:44,164 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:44,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:44,166 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 16:54:44,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:44,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1664971804] [2020-07-20 16:54:44,168 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 16:54:44,225 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:44,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:44,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:44,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:44,317 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 16:54:44,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:44,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:44,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:44,724 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 16:54:44,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1664971804] [2020-07-20 16:54:44,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:44,726 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:54:44,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812629353] [2020-07-20 16:54:44,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:54:44,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:44,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:54:44,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:44,729 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 16:54:45,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:45,161 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-20 16:54:45,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:45,162 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 16:54:45,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:45,165 INFO L225 Difference]: With dead ends: 84 [2020-07-20 16:54:45,165 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 16:54:45,168 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 16:54:45,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 16:54:45,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-20 16:54:45,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 16:54:45,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-20 16:54:45,185 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-20 16:54:45,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:45,187 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-20 16:54:45,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:54:45,187 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-20 16:54:45,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:54:45,191 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:45,191 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 16:54:45,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:45,405 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:45,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:45,408 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-20 16:54:45,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:45,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107729620] [2020-07-20 16:54:45,410 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 16:54:45,509 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:45,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:45,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:45,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:45,623 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 16:54:45,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:45,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:45,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:46,056 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 16:54:46,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107729620] [2020-07-20 16:54:46,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:46,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:54:46,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375734580] [2020-07-20 16:54:46,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:54:46,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:46,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:54:46,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:46,061 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-20 16:54:46,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:46,229 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-20 16:54:46,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:46,230 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-20 16:54:46,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:46,233 INFO L225 Difference]: With dead ends: 63 [2020-07-20 16:54:46,233 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 16:54:46,234 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:54:46,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 16:54:46,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-20 16:54:46,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 16:54:46,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-20 16:54:46,249 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-20 16:54:46,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:46,250 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-20 16:54:46,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:54:46,250 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-20 16:54:46,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 16:54:46,253 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:46,254 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 16:54:46,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:46,460 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:46,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:46,461 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-20 16:54:46,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:46,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [144477239] [2020-07-20 16:54:46,462 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 16:54:46,506 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:46,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:46,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:54:46,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:46,595 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 16:54:46,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:46,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:46,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:46,916 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 16:54:46,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [144477239] [2020-07-20 16:54:46,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:46,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:54:46,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006969592] [2020-07-20 16:54:46,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:54:46,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:46,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:54:46,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:54:46,921 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-20 16:54:47,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:47,087 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-20 16:54:47,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:54:47,088 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-20 16:54:47,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:47,091 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:54:47,092 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:54:47,093 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 16:54:47,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:54:47,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-20 16:54:47,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 16:54:47,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-20 16:54:47,111 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-20 16:54:47,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:47,112 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-20 16:54:47,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:54:47,112 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-20 16:54:47,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 16:54:47,116 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:47,117 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 16:54:47,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:47,332 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:47,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:47,333 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-20 16:54:47,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:47,335 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1641726477] [2020-07-20 16:54:47,335 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 16:54:47,397 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:47,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:47,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:54:47,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:47,512 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 16:54:47,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:48,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:48,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:48,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:48,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:48,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:48,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:48,307 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 16:54:48,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1641726477] [2020-07-20 16:54:48,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:48,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:54:48,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544255484] [2020-07-20 16:54:48,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:54:48,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:48,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:54:48,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:54:48,312 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-20 16:54:48,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:48,594 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-20 16:54:48,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:54:48,595 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-20 16:54:48,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:48,598 INFO L225 Difference]: With dead ends: 75 [2020-07-20 16:54:48,598 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 16:54:48,600 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 16:54:48,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 16:54:48,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-20 16:54:48,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 16:54:48,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-20 16:54:48,619 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-20 16:54:48,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:48,620 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-20 16:54:48,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:54:48,620 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-20 16:54:48,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:54:48,623 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:48,623 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 16:54:48,838 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:48,839 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:48,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:48,840 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-20 16:54:48,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:48,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1947441971] [2020-07-20 16:54:48,842 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 16:54:48,899 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:48,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:48,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:48,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:48,999 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 16:54:49,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:49,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:49,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:49,498 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 16:54:49,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1947441971] [2020-07-20 16:54:49,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:49,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:54:49,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575244598] [2020-07-20 16:54:49,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:54:49,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:49,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:54:49,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:49,502 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-20 16:54:49,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:49,782 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-20 16:54:49,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:49,783 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-20 16:54:49,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:49,786 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:54:49,786 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:54:49,789 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 16:54:49,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:54:49,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:54:49,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:54:49,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-20 16:54:49,805 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-20 16:54:49,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:49,806 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-20 16:54:49,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:54:49,806 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-20 16:54:49,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:54:49,809 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:49,809 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 16:54:50,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:50,024 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:50,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:50,025 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-20 16:54:50,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:50,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1714256462] [2020-07-20 16:54:50,026 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 16:54:50,083 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:50,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:50,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:54:50,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:50,238 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 16:54:50,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:50,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:50,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:50,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:50,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:51,003 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 16:54:51,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1714256462] [2020-07-20 16:54:51,005 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:51,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:54:51,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460054148] [2020-07-20 16:54:51,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:54:51,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:51,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:54:51,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:54:51,009 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-20 16:54:51,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:51,546 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-20 16:54:51,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:54:51,547 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-20 16:54:51,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:51,551 INFO L225 Difference]: With dead ends: 131 [2020-07-20 16:54:51,551 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 16:54:51,553 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 16:54:51,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 16:54:51,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-20 16:54:51,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-20 16:54:51,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-20 16:54:51,593 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-20 16:54:51,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:51,595 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-20 16:54:51,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:54:51,596 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-20 16:54:51,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-20 16:54:51,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:51,601 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 16:54:51,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:51,803 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:51,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:51,803 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-20 16:54:51,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:51,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321530897] [2020-07-20 16:54:51,804 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 16:54:51,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:51,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:51,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:54:51,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:52,051 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 16:54:52,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:52,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:53,019 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 16:54:53,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321530897] [2020-07-20 16:54:53,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:53,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:54:53,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400083331] [2020-07-20 16:54:53,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:54:53,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:53,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:54:53,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:54:53,023 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-20 16:54:53,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:53,970 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-20 16:54:53,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 16:54:53,971 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-20 16:54:53,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:53,975 INFO L225 Difference]: With dead ends: 186 [2020-07-20 16:54:53,975 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 16:54:53,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:54:53,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 16:54:53,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-20 16:54:53,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 16:54:53,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-20 16:54:53,997 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-20 16:54:53,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:53,997 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-20 16:54:53,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:54:53,998 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-20 16:54:53,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:54:54,000 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:54,000 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 16:54:54,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:54,214 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:54,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:54,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-20 16:54:54,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:54,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1625332011] [2020-07-20 16:54:54,217 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 16:54:54,280 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:54,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:54,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:54:54,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:54,335 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 16:54:54,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:54,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:54,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:54,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:54,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:54,879 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 16:54:54,879 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1625332011] [2020-07-20 16:54:54,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:54,880 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:54:54,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555832714] [2020-07-20 16:54:54,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:54:54,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:54,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:54:54,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:54:54,882 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-20 16:54:55,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:55,080 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-20 16:54:55,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:54:55,082 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-20 16:54:55,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:55,084 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:54:55,084 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 16:54:55,085 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:54:55,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 16:54:55,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-20 16:54:55,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-20 16:54:55,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-20 16:54:55,100 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-20 16:54:55,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:55,100 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-20 16:54:55,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:54:55,101 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-20 16:54:55,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-20 16:54:55,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:55,103 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 16:54:55,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:55,314 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:55,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:55,315 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-20 16:54:55,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:55,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [205712941] [2020-07-20 16:54:55,317 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 16:54:55,388 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:55,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:55,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:54:55,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:55,525 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 16:54:55,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:56,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:56,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:56,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:56,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:56,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:56,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:56,368 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 16:54:56,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [205712941] [2020-07-20 16:54:56,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:56,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-20 16:54:56,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144160222] [2020-07-20 16:54:56,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:54:56,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:56,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:54:56,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:54:56,374 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-20 16:54:56,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:56,936 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-20 16:54:56,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:54:56,938 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-20 16:54:56,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:56,943 INFO L225 Difference]: With dead ends: 269 [2020-07-20 16:54:56,944 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 16:54:56,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:54:56,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 16:54:56,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-20 16:54:56,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 16:54:56,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-20 16:54:56,985 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-20 16:54:56,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:56,987 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-20 16:54:56,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:54:56,988 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-20 16:54:56,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 16:54:56,991 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:56,992 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 16:54:57,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:57,206 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:57,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:57,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-20 16:54:57,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:57,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1447911574] [2020-07-20 16:54:57,209 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 16:54:57,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:57,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:57,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:57,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:57,339 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 16:54:57,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:57,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,800 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 16:54:57,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1447911574] [2020-07-20 16:54:57,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:57,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:54:57,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071612613] [2020-07-20 16:54:57,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:54:57,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:57,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:54:57,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:57,804 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-20 16:54:58,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:58,042 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-20 16:54:58,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:58,044 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-20 16:54:58,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:58,049 INFO L225 Difference]: With dead ends: 167 [2020-07-20 16:54:58,050 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 16:54:58,055 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 16:54:58,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 16:54:58,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-20 16:54:58,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 16:54:58,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-20 16:54:58,093 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-20 16:54:58,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:58,094 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-20 16:54:58,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:54:58,095 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-20 16:54:58,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:54:58,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:58,102 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 16:54:58,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:58,316 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:58,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:58,317 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-20 16:54:58,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:58,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1158420906] [2020-07-20 16:54:58,319 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 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 16:54:58,434 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:58,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:58,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:54:58,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:58,607 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 16:54:58,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:59,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:59,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:59,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:59,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:00,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:00,099 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 16:55:00,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1158420906] [2020-07-20 16:55:00,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:00,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:55:00,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568656206] [2020-07-20 16:55:00,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:55:00,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:00,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:55:00,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:55:00,104 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-20 16:55:00,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:00,845 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-20 16:55:00,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:55:00,846 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-20 16:55:00,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:00,854 INFO L225 Difference]: With dead ends: 369 [2020-07-20 16:55:00,854 INFO L226 Difference]: Without dead ends: 218 [2020-07-20 16:55:00,859 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 16:55:00,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-20 16:55:00,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-20 16:55:00,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 16:55:00,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-20 16:55:00,891 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-20 16:55:00,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:00,892 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-20 16:55:00,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:55:00,893 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-20 16:55:00,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-20 16:55:00,898 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:00,898 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 16:55:01,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:01,113 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:01,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:01,114 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-20 16:55:01,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:01,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612830433] [2020-07-20 16:55:01,116 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 16:55:01,208 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:01,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:01,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:55:01,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:01,268 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 16:55:01,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:01,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:01,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:01,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:01,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:01,730 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 16:55:01,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612830433] [2020-07-20 16:55:01,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:01,731 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:55:01,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518373014] [2020-07-20 16:55:01,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:55:01,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:01,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:55:01,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:55:01,734 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-20 16:55:01,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:01,989 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-20 16:55:01,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:55:01,990 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-20 16:55:01,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:01,994 INFO L225 Difference]: With dead ends: 191 [2020-07-20 16:55:01,995 INFO L226 Difference]: Without dead ends: 187 [2020-07-20 16:55:01,996 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 16:55:01,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-20 16:55:02,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-20 16:55:02,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 16:55:02,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-20 16:55:02,018 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-20 16:55:02,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:02,019 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-20 16:55:02,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:55:02,019 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-20 16:55:02,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-07-20 16:55:02,023 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:02,023 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 16:55:02,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:02,239 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:02,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:02,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1156827333, now seen corresponding path program 2 times [2020-07-20 16:55:02,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:02,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [805052707] [2020-07-20 16:55:02,241 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 16:55:02,339 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:02,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:02,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:55:02,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:02,572 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 16:55:02,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:03,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:03,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:03,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:03,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:03,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,182 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 16:55:04,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [805052707] [2020-07-20 16:55:04,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:04,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 23 [2020-07-20 16:55:04,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582508880] [2020-07-20 16:55:04,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:55:04,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:04,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:55:04,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:55:04,187 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 23 states. [2020-07-20 16:55:05,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:05,189 INFO L93 Difference]: Finished difference Result 393 states and 799 transitions. [2020-07-20 16:55:05,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 16:55:05,190 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 118 [2020-07-20 16:55:05,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:05,195 INFO L225 Difference]: With dead ends: 393 [2020-07-20 16:55:05,195 INFO L226 Difference]: Without dead ends: 222 [2020-07-20 16:55:05,200 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 16:55:05,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2020-07-20 16:55:05,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 183. [2020-07-20 16:55:05,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-07-20 16:55:05,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 321 transitions. [2020-07-20 16:55:05,227 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 321 transitions. Word has length 118 [2020-07-20 16:55:05,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:05,228 INFO L479 AbstractCegarLoop]: Abstraction has 183 states and 321 transitions. [2020-07-20 16:55:05,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:55:05,228 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 321 transitions. [2020-07-20 16:55:05,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-07-20 16:55:05,232 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:05,233 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:05,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:05,449 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:05,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:05,449 INFO L82 PathProgramCache]: Analyzing trace with hash 767209796, now seen corresponding path program 3 times [2020-07-20 16:55:05,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:05,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1542298047] [2020-07-20 16:55:05,451 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 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 16:55:05,599 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:05,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:05,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:55:05,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:05,682 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 20 proven. 96 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 16:55:05,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:06,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:06,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:06,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:06,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:06,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:06,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:06,869 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 20 proven. 104 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-07-20 16:55:06,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1542298047] [2020-07-20 16:55:06,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:06,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:55:06,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103177298] [2020-07-20 16:55:06,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:55:06,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:06,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:55:06,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:55:06,872 INFO L87 Difference]: Start difference. First operand 183 states and 321 transitions. Second operand 16 states. [2020-07-20 16:55:07,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:07,189 INFO L93 Difference]: Finished difference Result 203 states and 360 transitions. [2020-07-20 16:55:07,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:55:07,193 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 104 [2020-07-20 16:55:07,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:07,199 INFO L225 Difference]: With dead ends: 203 [2020-07-20 16:55:07,200 INFO L226 Difference]: Without dead ends: 199 [2020-07-20 16:55:07,201 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 185 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 16:55:07,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2020-07-20 16:55:07,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 188. [2020-07-20 16:55:07,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 16:55:07,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 333 transitions. [2020-07-20 16:55:07,233 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 333 transitions. Word has length 104 [2020-07-20 16:55:07,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:07,238 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 333 transitions. [2020-07-20 16:55:07,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:55:07,238 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 333 transitions. [2020-07-20 16:55:07,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-20 16:55:07,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:07,243 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:07,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:07,459 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:07,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:07,461 INFO L82 PathProgramCache]: Analyzing trace with hash -1607585794, now seen corresponding path program 5 times [2020-07-20 16:55:07,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:07,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437897775] [2020-07-20 16:55:07,462 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 16:55:07,597 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:07,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:07,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:55:07,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:07,765 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 158 proven. 31 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2020-07-20 16:55:07,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:08,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:08,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:09,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:09,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:09,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:09,161 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 50 proven. 96 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2020-07-20 16:55:09,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437897775] [2020-07-20 16:55:09,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:09,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:55:09,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968501262] [2020-07-20 16:55:09,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:55:09,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:09,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:55:09,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:55:09,166 INFO L87 Difference]: Start difference. First operand 188 states and 333 transitions. Second operand 17 states. [2020-07-20 16:55:09,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:09,794 INFO L93 Difference]: Finished difference Result 374 states and 685 transitions. [2020-07-20 16:55:09,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:55:09,795 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 106 [2020-07-20 16:55:09,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:09,799 INFO L225 Difference]: With dead ends: 374 [2020-07-20 16:55:09,799 INFO L226 Difference]: Without dead ends: 192 [2020-07-20 16:55:09,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 186 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:55:09,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-20 16:55:09,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-20 16:55:09,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 16:55:09,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 327 transitions. [2020-07-20 16:55:09,827 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 327 transitions. Word has length 106 [2020-07-20 16:55:09,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:09,828 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 327 transitions. [2020-07-20 16:55:09,828 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:55:09,828 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 327 transitions. [2020-07-20 16:55:09,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:55:09,832 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:09,832 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 16:55:10,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:10,048 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:10,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:10,049 INFO L82 PathProgramCache]: Analyzing trace with hash -1245954009, now seen corresponding path program 6 times [2020-07-20 16:55:10,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:10,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [643513941] [2020-07-20 16:55:10,050 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 16:55:10,220 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:10,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:10,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:55:10,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:10,391 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 124 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2020-07-20 16:55:10,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:11,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:11,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:11,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:11,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:11,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:11,908 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 130 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2020-07-20 16:55:11,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [643513941] [2020-07-20 16:55:11,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:11,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:55:11,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702486430] [2020-07-20 16:55:11,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:55:11,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:11,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:55:11,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:55:11,915 INFO L87 Difference]: Start difference. First operand 190 states and 327 transitions. Second operand 21 states. [2020-07-20 16:55:13,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:13,082 INFO L93 Difference]: Finished difference Result 387 states and 724 transitions. [2020-07-20 16:55:13,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:55:13,084 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-20 16:55:13,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:13,091 INFO L225 Difference]: With dead ends: 387 [2020-07-20 16:55:13,091 INFO L226 Difference]: Without dead ends: 201 [2020-07-20 16:55:13,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 211 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:55:13,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-20 16:55:13,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 180. [2020-07-20 16:55:13,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2020-07-20 16:55:13,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 284 transitions. [2020-07-20 16:55:13,129 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 284 transitions. Word has length 120 [2020-07-20 16:55:13,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:13,130 INFO L479 AbstractCegarLoop]: Abstraction has 180 states and 284 transitions. [2020-07-20 16:55:13,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:55:13,130 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 284 transitions. [2020-07-20 16:55:13,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 16:55:13,134 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:13,135 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:13,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:13,351 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:13,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:13,352 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 7 times [2020-07-20 16:55:13,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:13,353 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [412265136] [2020-07-20 16:55:13,353 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 16:55:13,533 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:13,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:13,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:55:13,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:13,684 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 20 proven. 107 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 16:55:13,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:14,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:14,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:14,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:14,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:14,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:15,076 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 20 proven. 117 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 16:55:15,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [412265136] [2020-07-20 16:55:15,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:15,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 16:55:15,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69397726] [2020-07-20 16:55:15,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:55:15,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:15,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:55:15,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:55:15,082 INFO L87 Difference]: Start difference. First operand 180 states and 284 transitions. Second operand 15 states. [2020-07-20 16:55:15,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:15,476 INFO L93 Difference]: Finished difference Result 214 states and 364 transitions. [2020-07-20 16:55:15,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:55:15,481 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 109 [2020-07-20 16:55:15,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:15,489 INFO L225 Difference]: With dead ends: 214 [2020-07-20 16:55:15,489 INFO L226 Difference]: Without dead ends: 210 [2020-07-20 16:55:15,494 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 193 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:55:15,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2020-07-20 16:55:15,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 207. [2020-07-20 16:55:15,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:55:15,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 352 transitions. [2020-07-20 16:55:15,533 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 352 transitions. Word has length 109 [2020-07-20 16:55:15,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:15,535 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 352 transitions. [2020-07-20 16:55:15,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:55:15,535 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 352 transitions. [2020-07-20 16:55:15,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-20 16:55:15,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:15,540 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:15,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:15,755 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:15,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:15,755 INFO L82 PathProgramCache]: Analyzing trace with hash -1996526584, now seen corresponding path program 3 times [2020-07-20 16:55:15,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:15,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1273453708] [2020-07-20 16:55:15,757 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 16:55:15,923 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:15,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:15,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:55:15,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:15,997 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 48 proven. 105 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2020-07-20 16:55:15,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:16,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:16,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:16,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:16,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:16,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:16,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:16,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:16,837 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 48 proven. 110 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2020-07-20 16:55:16,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1273453708] [2020-07-20 16:55:16,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:16,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 16:55:16,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997741330] [2020-07-20 16:55:16,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:55:16,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:16,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:55:16,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:55:16,841 INFO L87 Difference]: Start difference. First operand 207 states and 352 transitions. Second operand 13 states. [2020-07-20 16:55:17,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:17,104 INFO L93 Difference]: Finished difference Result 237 states and 416 transitions. [2020-07-20 16:55:17,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:55:17,105 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 133 [2020-07-20 16:55:17,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:17,111 INFO L225 Difference]: With dead ends: 237 [2020-07-20 16:55:17,111 INFO L226 Difference]: Without dead ends: 233 [2020-07-20 16:55:17,113 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 246 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:55:17,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2020-07-20 16:55:17,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 207. [2020-07-20 16:55:17,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:55:17,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 352 transitions. [2020-07-20 16:55:17,144 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 352 transitions. Word has length 133 [2020-07-20 16:55:17,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:17,148 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 352 transitions. [2020-07-20 16:55:17,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:55:17,149 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 352 transitions. [2020-07-20 16:55:17,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 16:55:17,155 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:17,156 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 16:55:17,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:17,371 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:17,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:17,371 INFO L82 PathProgramCache]: Analyzing trace with hash 2023571201, now seen corresponding path program 4 times [2020-07-20 16:55:17,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:17,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [421015120] [2020-07-20 16:55:17,372 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 16:55:17,522 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:17,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:17,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:55:17,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:17,609 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 16:55:17,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:18,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:18,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:18,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:18,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:18,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:18,556 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 16:55:18,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [421015120] [2020-07-20 16:55:18,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:18,557 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 16:55:18,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359927961] [2020-07-20 16:55:18,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:55:18,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:18,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:55:18,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:55:18,562 INFO L87 Difference]: Start difference. First operand 207 states and 352 transitions. Second operand 13 states. [2020-07-20 16:55:18,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:18,823 INFO L93 Difference]: Finished difference Result 227 states and 392 transitions. [2020-07-20 16:55:18,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:55:18,825 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 145 [2020-07-20 16:55:18,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:18,829 INFO L225 Difference]: With dead ends: 227 [2020-07-20 16:55:18,830 INFO L226 Difference]: Without dead ends: 223 [2020-07-20 16:55:18,831 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:55:18,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2020-07-20 16:55:18,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 207. [2020-07-20 16:55:18,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:55:18,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 352 transitions. [2020-07-20 16:55:18,857 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 352 transitions. Word has length 145 [2020-07-20 16:55:18,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:18,858 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 352 transitions. [2020-07-20 16:55:18,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:55:18,859 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 352 transitions. [2020-07-20 16:55:18,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2020-07-20 16:55:18,863 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:18,864 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 16:55:19,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:19,080 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:19,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:19,081 INFO L82 PathProgramCache]: Analyzing trace with hash 857210524, now seen corresponding path program 8 times [2020-07-20 16:55:19,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:19,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838706348] [2020-07-20 16:55:19,082 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 16:55:19,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:55:19,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:19,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:55:19,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:19,453 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 16:55:19,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:20,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:20,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:20,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:20,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:21,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:21,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:21,108 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 16:55:21,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838706348] [2020-07-20 16:55:21,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:21,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:55:21,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540815059] [2020-07-20 16:55:21,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:55:21,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:21,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:55:21,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:55:21,111 INFO L87 Difference]: Start difference. First operand 207 states and 352 transitions. Second operand 17 states. [2020-07-20 16:55:21,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:21,670 INFO L93 Difference]: Finished difference Result 409 states and 721 transitions. [2020-07-20 16:55:21,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:55:21,671 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 158 [2020-07-20 16:55:21,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:21,678 INFO L225 Difference]: With dead ends: 409 [2020-07-20 16:55:21,679 INFO L226 Difference]: Without dead ends: 207 [2020-07-20 16:55:21,693 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 16:55:21,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2020-07-20 16:55:21,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 191. [2020-07-20 16:55:21,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2020-07-20 16:55:21,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 303 transitions. [2020-07-20 16:55:21,727 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 303 transitions. Word has length 158 [2020-07-20 16:55:21,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:21,728 INFO L479 AbstractCegarLoop]: Abstraction has 191 states and 303 transitions. [2020-07-20 16:55:21,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:55:21,729 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 303 transitions. [2020-07-20 16:55:21,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2020-07-20 16:55:21,734 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:21,735 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 16:55:21,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:21,953 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:21,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:21,954 INFO L82 PathProgramCache]: Analyzing trace with hash -146170438, now seen corresponding path program 5 times [2020-07-20 16:55:21,955 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:21,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [630432263] [2020-07-20 16:55:21,959 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 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 16:55:22,205 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:22,206 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:22,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:55:22,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:22,329 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 16:55:22,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:22,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:22,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:23,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:23,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:23,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:23,430 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 16:55:23,431 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [630432263] [2020-07-20 16:55:23,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:23,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 16:55:23,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293079178] [2020-07-20 16:55:23,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:55:23,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:23,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:55:23,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:55:23,435 INFO L87 Difference]: Start difference. First operand 191 states and 303 transitions. Second operand 13 states. [2020-07-20 16:55:23,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:23,849 INFO L93 Difference]: Finished difference Result 198 states and 314 transitions. [2020-07-20 16:55:23,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:55:23,852 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 157 [2020-07-20 16:55:23,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:23,857 INFO L225 Difference]: With dead ends: 198 [2020-07-20 16:55:23,858 INFO L226 Difference]: Without dead ends: 194 [2020-07-20 16:55:23,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 295 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:55:23,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-07-20 16:55:23,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 174. [2020-07-20 16:55:23,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-20 16:55:23,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 269 transitions. [2020-07-20 16:55:23,882 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 269 transitions. Word has length 157 [2020-07-20 16:55:23,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:23,883 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 269 transitions. [2020-07-20 16:55:23,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:55:23,883 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 269 transitions. [2020-07-20 16:55:23,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-20 16:55:23,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:23,887 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 16:55:24,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:24,101 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:24,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:24,102 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 9 times [2020-07-20 16:55:24,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:24,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047813004] [2020-07-20 16:55:24,103 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 16:55:24,289 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:55:24,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 16:55:24,290 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:55:24,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 16:55:24,335 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:55:24,382 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 16:55:24,383 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 16:55:24,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:24,687 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:55:24 BoogieIcfgContainer [2020-07-20 16:55:24,687 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:55:24,691 INFO L168 Benchmark]: Toolchain (without parser) took 46786.81 ms. Allocated memory was 136.8 MB in the beginning and 502.8 MB in the end (delta: 366.0 MB). Free memory was 101.0 MB in the beginning and 390.8 MB in the end (delta: -289.8 MB). Peak memory consumption was 76.2 MB. Max. memory is 7.1 GB. [2020-07-20 16:55:24,692 INFO L168 Benchmark]: CDTParser took 0.47 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 16:55:24,692 INFO L168 Benchmark]: CACSL2BoogieTranslator took 463.02 ms. Allocated memory is still 136.8 MB. Free memory was 100.6 MB in the beginning and 91.2 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:55:24,693 INFO L168 Benchmark]: Boogie Preprocessor took 190.10 ms. Allocated memory was 136.8 MB in the beginning and 203.4 MB in the end (delta: 66.6 MB). Free memory was 91.0 MB in the beginning and 182.1 MB in the end (delta: -91.1 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:55:24,693 INFO L168 Benchmark]: RCFGBuilder took 497.09 ms. Allocated memory is still 203.4 MB. Free memory was 182.1 MB in the beginning and 168.8 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:55:24,695 INFO L168 Benchmark]: TraceAbstraction took 45608.08 ms. Allocated memory was 203.4 MB in the beginning and 502.8 MB in the end (delta: 299.4 MB). Free memory was 168.8 MB in the beginning and 390.8 MB in the end (delta: -222.1 MB). Peak memory consumption was 77.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:55:24,697 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.47 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 463.02 ms. Allocated memory is still 136.8 MB. Free memory was 100.6 MB in the beginning and 91.2 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 190.10 ms. Allocated memory was 136.8 MB in the beginning and 203.4 MB in the end (delta: 66.6 MB). Free memory was 91.0 MB in the beginning and 182.1 MB in the end (delta: -91.1 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 497.09 ms. Allocated memory is still 203.4 MB. Free memory was 182.1 MB in the beginning and 168.8 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 45608.08 ms. Allocated memory was 203.4 MB in the beginning and 502.8 MB in the end (delta: 299.4 MB). Free memory was 168.8 MB in the beginning and 390.8 MB in the end (delta: -222.1 MB). Peak memory consumption was 77.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 6; VAL [x=6] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=6] [L8] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L10] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=5] [L18] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L20] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=5, fibo1(n-1)=3, n=5] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=5, fibo1(n-1)=3, fibo1(n-2)=2, n=5] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=6, fibo2(n-1)=5, n=6] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=6, fibo2(n-1)=5, fibo2(n-2)=3, n=6] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=8, x=6] [L37] int result = fibo1(x); [L38] COND TRUE result == 8 VAL [result=8, x=6] [L39] __VERIFIER_error() VAL [result=8, x=6] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 45.3s, OverallIterations: 27, TraceHistogramMax: 13, AutomataDifference: 11.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 674 SDtfs, 1372 SDslu, 4125 SDs, 0 SdLazy, 4896 SolverSat, 1168 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4473 GetRequests, 3796 SyntacticMatches, 206 SemanticMatches, 471 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1365 ImplicationChecksByTransitivity, 8.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=207occurred in iteration=22, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.6s AutomataMinimizationTime, 26 MinimizatonAttempts, 325 StatesRemovedByMinimization, 25 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.9s SatisfiabilityAnalysisTime, 24.0s InterpolantComputationTime, 2329 NumberOfCodeBlocks, 1535 NumberOfCodeBlocksAsserted, 71 NumberOfCheckSat, 4227 ConstructedInterpolants, 0 QuantifiedInterpolants, 814033 SizeOfPredicates, 138 NumberOfNonLiveVariables, 3686 ConjunctsInSsa, 256 ConjunctsInUnsatCore, 50 InterpolantComputations, 2 PerfectInterpolantSequences, 7513/10148 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 incorrect! Received shutdown request...